Paradyne 3800 User Manual

COMSPHERE

3800 SERIES MODEMS

MODELS 3810, 3811, AND 3820

USER’S GUIDE

Document No. 3810-A2-GB30-30

COMSPHERE

3800 SERIES MODEMS

MODELS 3810, 3811, AND 3820

USER’S GUIDE

Document No. 3810-A2-GB30-30

September 1998

COMSPHERE 3800 Series Modems

COMSPHERE
3800 Series Modems
Models 3810, 3811, and 3820

User’s Guide
3810-A2-GB30-30

4th Edition (September 1998)

Changes and enhancements to the product and to the information herein will be documented and issued as a new release.
For the 3800 Series standalone modems, the Universal Service Order Code (USOC) for Permissive mode is RJ11C. The

Canadian equivalent to the USOC is CA11. For 3800 Series carrier-mounted modems, the USOC for Permissive mode is
RJ21X. The Canadian equivalent to the USOC is CA21A.

Warranty, Sales, and Service Information

Contact your local sales representative, service representative, or distributor directly for any help needed. For additional
information concerning warranty , sales, service, repair, installation, documentation, training, distributor locations, or
Paradyne worldwide office locations, use one of the following methods:

H Via the Internet: Visit the Paradyne World Wide W eb site at http://www.paradyne.com
H Via Telephone: Call our automated call system to receive current information via fax or to speak with a

company representative.

— Within the U.S.A., call 1-800-870-2221
— Outside the U.S.A., call 1-727-530-2340

Document Feedback

We welcome your comments and suggestions about this document. Please mail them to Technical Publications, Paradyne
Corporation, 8545 126th Ave. N., Largo, FL 33773, or send e-mail to [e-mail]. Include the number and
title of this document in your correspondence. Please include your name and phone number if you are willing to provide
additional clarification.

Trademarks

All products and services mentioned herein are the trademarks, service marks, registered trademarks or registered service
marks of their respective owners.

Printed on recycled paper

COPYRIGHT E 1998 Paradyne Corporation. All rights reserved.

This publication is protected by federal copyright law. No part of this publication may be copied or distributed, transmitted, transcribed, stored in a retrieval system,
or translated into any human or computer language in any form or by any means, electronic, mechanical, magnetic, manual or otherwise, or disclosed to third parties
without the express written permission of Paradyne Corporation, 8545 126th Avenue North, P.O. Box 2826, Largo, Florida 33779-2826.

Paradyne Corporation makes no representation or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability
or fitness for a particular purpose. Further, Paradyne Corporation reserves the right to revise this publication and to make changes from time to time in the contents
hereof without obligation of Paradyne Corporation to notify any person of such revision or changes.

A September 1998 3810-A2-GB30-30

Important Safety Instructions

1. Read and follow all warning notices and instructions marked on the product or included in the
manual.

2. This product is intended to be used with a three-wire grounding type plug – a plug which has
a grounding pin. This is a safety feature. Equipment grounding is vital to ensure safe
operation. Do not defeat the purpose of the grounding type plug by modifying the plug or
using an adapter.

Prior to installation, use an outlet tester or a voltmeter to check the ac receptacle for the
presence of earth ground. If the receptacle is not properly grounded, the installation must not
continue until a qualified electrician has corrected the problem.

If a three-wire grounding type power source is not available, consult a qualified electrician to
determine another method of grounding the equipment.

3. Slots and openings in the cabinet are provided for ventilation. T o ensure reliable operation of
the product and to protect it from overheating, these slots and openings must not be blocked
or covered.

4. Do not allow anything to rest on the power cord and do not locate the product where persons
will walk on the power cord.

Safety Instructions

5. Do not attempt to service this product yourself, as opening or removing covers may expose
you to dangerous high voltage points or other risks. Refer all servicing to qualified service
personnel.

6. General purpose cables are provided with this product. Special cables, which may be required
by the regulatory inspection authority for the installation site, are the responsibility of the
customer.

7. When installed in the final configuration, the product must comply with the applicable Safety
Standards and regulatory requirements of the country in which it is installed. If necessary,
consult with the appropriate regulatory agencies and inspection authorities to ensure
compliance.

8. A rare phenomenon can create a voltage potential between the earth grounds of two or more
buildings. If products installed in separate buildings are interconnected, the voltage potential
may cause a hazardous condition. Consult a qualified electrical consultant to determine
whether or not this phenomenon exists and, if necessary, implement corrective action prior to
interconnecting the products.

In addition, if the equipment is to be used with telecommunications circuits, take the following
precautions:

– Never install telephone wiring during a lightning storm.
– Never install telephone jacks in wet locations unless the jack is specifically designed for wet

locations.

– Never touch uninsulated telephone wires or terminals unless the telephone line has been

disconnected at the network interface.

– Use caution when installing or modifying telephone lines.
– Avoid using a telephone (other than a cordless type) during an electrical storm.

There may be a remote risk of electric shock from lightning.

– Do not use the telephone to report a gas leak in the vicinity of the leak.

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COMSPHERE 3800 Series Modems

Notices

WARNING

THIS EQUIPMENT HAS BEEN TESTED AND FOUND TO COMPL Y WITH THE LIMITS FOR A CLASS A DIGITAL DEVICE,
PURSUANT TO PART 15 OF THE FCC RULES. THESE LIMITS ARE DESIGNED TO PROVIDE REASONABLE
PROTECTION AGAINST HARMFUL INTERFERENCE WHEN THE EQUIPMENT IS OPERATED IN A COMMERCIAL
ENVIRONMENT. THIS EQUIPMENT GENERATES, USES, AND CAN RADIATE RADIO FREQUENCY ENERGY AND, IF
NOT INSTALLED AND USED IN ACCORDANCE WITH THE INSTRUCTION MANUAL, MAY CAUSE HARMFUL
INTERFERENCE TO RADIO COMMUNICATIONS. OPERATION OF THIS EQUIPMENT IN A RESIDENTIAL AREA IS
LIKELY TO CAUSE HARMFUL INTERFERENCE IN WHICH CASE THE USER WILL BE REQUIRED TO CORRECT THE
INTERFERENCE AT HIS OWN EXPENSE.

THE AUTHORITY TO OPERATE THIS EQUIPMENT IS CONDITIONED BY THE REQUIREMENTS THAT NO
MODIFICATIONS WILL BE MADE T O THE EQUIPMENT UNLESS THE CHANGES OR MODIFICA TIONS ARE EXPRESSL Y
APPROVED BY PARADYNE.

WARNING

TO USERS OF DIGITAL APPARATUS IN CANADA:
THIS CLASS A DIGITAL APPARATUS MEETS ALL REQUIREMENTS OF THE CANADIAN INTERFERENCE-CAUSING

EQUIPMENT REGULATIONS.
CET APPAREIL NUMÉRIQUE DE LA CLASSE A RESPECTE TOUTES LES EXIGENCES DU RÈGLEMENT SUR LE

MATÉRIEL BROUILLEUR DU CANADA.

The following warning applies to all Model 3811 modems.

WARNING

THE MODEL 3811 IS PROVIDED WITH A REPLACEABLE LITHIUM BATTERY. REPLACE THE BATTERY ONLY WITH
THE SAME TYPE RECOMMENDED BY THE MANUFACTURER. DISCARD USED BATTERIES ACCORDING TO THE
MANUFACTURER’S INSTRUCTIONS.

LE MODÈLE 3811 EST FOURNI AVEC UNE PILE AU LITHIUM REMPLAÇABLE REMPLACER UNIQUEMENT AVEC
UNE BATTERIE DU MÊME TYPE OU D’UN TYPE RECOMMANDÉ PAR LE CONSTRUCTEUR. METTRE AU RÉBUT
LES BATTERIES USAGÉES CONFORMÉMENT AUX INSTRUCTIONS DU FABRICANT.

C September 1998 3810-A2-GB30-30

Government Requirements and Equipment Return

Certain governments require that instructions pertaining to modem connection to the public switched
telephone network be included in the installation and operation manual. Specific instructions are
listed in the following sections.

United States

Notice to Users of the Public Switched Telephone Network

1. This equipment complies with Part 68 of the FCC rules. On the equipment is a label that contains,
among other information, the FCC registration number and ringer equivalence number (REN) for
this equipment. The label is located on the bottom of the Model 3810 and 3820 modems. This label
is located on the Model 3811’s circuit card assembly. If requested, this information must be
provided to the telephone company.

2. Page A of this manual contains the Universal Service Order Codes (USOC) associated with the
services on which the equipment is to be connected.

Safety Instructions

3. The Ringer Equivalence (REN) is used to determine the quantity of devices which may be
connected to the telephone line. Excessive RENs on the telephone line may result in the devices
not ringing in response to an incoming call. In most, but not all areas, the sum of the RENs should
not exceed five (5.0). T o be certain of the number of devices that may be connected to the line, as
determined by the total RENs, contact the telephone company to determine the maximum RENs
for the calling area.

4. If the 3800 Series modem causes harm to the telephone network, the telephone company will
notify you in advance that temporary discontinuance of service may be required. But if advance
notice is not practical, the telephone company will notify the customer as soon as possible. Also,
you will be advised of your right to file a complaint with the FCC if you believe it is necessary.

5. The telephone company may make changes in its facilities, equipment, operations, or procedures
that could affect the operation of the equipment. If this happens, the telephone company will
provide advance notice in order for you to make the necessary modifications in order to maintain
uninterrupted service.

6. If you experience trouble with this equipment, please contact your sales or service representative (as
appropriate) for repair or warranty information. If the product needs to be returned to the company service
center for repair, contact them directly for return instructions using one of the following methods:

• Via the Internet: Visit the Paradyne World W ide Web site at http://www.paradyne.com

• Via Telephone: Call our automated call system to receive current information via fax or to speak with

a company representative.

— Within the U.S.A., call 1-800-870-2221
— Outside the U.S.A., call 727-530-2340

If the trouble is causing harm to the telephone network, the telephone company may request that you
remove the equipment from the network until the problem is resolved.

7. The user is not authorized to repair or modify the equipment.

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COMSPHERE 3800 Series Modems

8. This equipment cannot be used on public coin service provided by the telephone company.
Connection to Party Line Service is subject to state tariffs. (Contact the state public utility
commission, public service commission or corporation commission for information.)

9. The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to use a
computer or other electronic device to send any message via a telephone fax machine unless such a
message clearly contains, in a margin at the top or bottom of each transmitted page, or on the first
page of the transmission, the date and time it is sent, and an identification of the business, or other
entity , or other individual sending the message, and the telephone number of such business, or
other entity, or individual.

In order to program this information, follow the steps outlined in the manual supplied with your
fax software.

10. An FCC compliant telephone cord with modular plugs may be provided with this equipment. This
equipment is designed to be connected to the telephone network or premises wiring using a
compatible modular jack which is Part 68 compliant.

Canada

Notice to Users of the Canadian Public Switched Telephone Network

The Canadian Department of Communications label identifies certified equipment. This certification
means that the equipment meets certain telecommunications network protective, operational and
safety requirements. The Department does not guarantee the equipment will operate to the user’s
satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the
facilities of the local telecommunications company. The equipment must also be installed using an
acceptable method of connection. In some cases, the company’s inside wiring associated with a single
line individual service may be extended by means of a certified connector assembly (telephone
extension cord). The customer should be aware that compliance with the above conditions may not
prevent degradation of service in some situations.

E September 1998 3810-A2-GB30-30

Safety Instructions

Repairs to certified equipment should be made by an authorized Canadian maintenance facility
designated by the supplier. Any repairs or alterations made by the user to this equipment, or
equipment malfunctions, may give the telecommunications company cause to request the user to
disconnect the equipment.

Users should ensure for their own protection that the electrical ground connections of the power
utility, telephone line and internal metallic water pipe system, if present, are connected together. This
precaution may be particularly important in rural areas.

CAUTION

Users should not attempt to make such connections themselves, but
should contact the appropriate electric inspection authority, or
electrician, as appropriate.

The Load Number for this equipment is listed on the label on the modem. The Load Number (LN)
assigned to each terminal device denotes the percentage of the total load to be connected to a
telephone loop which is used by the device to prevent overloading. The termination on a loop may
consist of any combination of devices subject only to the requirement that the total of the Load
Numbers of all devices does not exceed 100.

If your equipment is in need of repair, refer to the procedures described on page A in the front of this
document for contact information.

F3810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

G September 1998 3810-A2-GB30-30

Table of Contents

Preface

Objectives and Reader Assumptions vii. . . . . . . . . . . . . . . . . . . . . . . . . . .

How to Use This Manual vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Documents viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Introduction

Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3800 Series Models 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Model 3810 and 3820 Installation

Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3800 Series Modem Package 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3810 or Model 3820 Modem Installation 2-3. . . . . . . . . . . . . . . . . .

DTE Connection 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3810 Dial-Line Connection 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3810 4-Wire/2-Wire Leased-Line Connection 2-5. . . . . . . . . . . . . .

Model 3820 Dial-Line Connection 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3820 2-Wire Leased-Line Connection 2-6. . . . . . . . . . . . . . . . . . . .

Model 3810 and Model 3820 T elephone Connection 2-7. . . . . . . . . . . . . .

Dial Network Management System Connection 2-7. . . . . . . . . . . . . . . . . .

AC Power Transformer Connection 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . .

Modem Power-Up 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing and Replacing Model 3810 and Model 3820 Modems 2-8. . . .

3. Model 3811 Installation

Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3811 Installation 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing and Replacing Model 3811 Modems 3-4. . . . . . . . . . . . . . . . . .

i3810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

4. DCP Operation

5. Call Setup Branch

6. Talk/Data Branch

Overview 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostic Control Panels 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Status Indicators 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostic Control Panel Operation 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . .

Menu Structure 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Selecting Factory Configuration Options 4-13. . . . . . . . . . . . . . . . . . . . . . .

Diagnostic Control Panel Security Access 4-15. . . . . . . . . . . . . . . . . . . . . .

Overview 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Call Setup Branch 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T alk/Data Branch 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. Status Branch

Overview 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Status Branch 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. Test Branch

Overview 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Branch 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9. Configure Branch

Overview 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configure Branch 9-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuration T ables 9-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Security Configuration Options 9-45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10. Control Branch

Overview 10-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Control Branch 10-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Automatic Firmware Download 10-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11. Remote Branch

Overview 11-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Branch 11-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ii September 1998 3810-A2-GB30-30

12. Security

Overview 12-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Security Branch 12-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Security Password Entry T echniques 12-11. . . . . . . . . . . . . . . . . . . . . . . . . . .

Database T able Examples 12-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13. Fax Operation

Overview 13-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fax Operation 13-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14. AT Command Set and S-Registers

Overview 14-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Modes 14-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Command Guidelines 14-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AT Command List 14-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

S-Register List 14-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

Appendices

Glossary

Index

A. Menu Tree A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B. Result Codes B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C. Troubleshooting C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D. T echnical Specifications D-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E. Pin Assignments E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F. ITU-T V.25bis Dialing Commands and Response F-1. . . . . . . . . . . . .

G. Default Configuration Options G-1. . . . . . . . . . . . . . . . . . . . . . . . . . .

H. Equipment List H-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iii3810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Figure Page

2-1 Model 3810 and 3820 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2 Model 3810 Rear Panel 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3 Model 3820 Rear Panel 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1 Model 3811 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2 Installing a Model 3811 Modem 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3 Circuit Pack Lock 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1 Model 3810 DCP 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2 Model 3820 DCP 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3 Optional SDCP, Model 3811 Faceplate, and Optional SDU 4-3. . . . . . . . . . . . . . . . . . .

4-4 3800 Series LCD and Keypad 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1 Dial Backup 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8-1 Local Analog Loopback 8-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8-2 Remote Digital Loopback 8-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8-3 Local Digital Loopback 8-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8-4 Pattern Test and Local Analog Loopback Test 8-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8-5 Pattern Test and Remote Digital Loopback Test 8-6. . . . . . . . . . . . . . . . . . . . . . . . . . . .

8-6 End-to-End Pattern Test 8-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-1 DCP Configuration Process 9-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-2 AT Command Configuration Process 9-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11-1 Top-Level Menu of a Remote 3800 Series Modem 11-3. . . . . . . . . . . . . . . . . . . . . . . . . .

E-1 Wiring Diagram – 8-Position to 6-Position Crossover Cable E-1. . . . . . . . . . . . . . . . . .

List of Figures

iv September 1998 3810-A2-GB30-30

Table of Contents

List of Tables

Tables Page

4-1 Model 3810 and Model 3811 DCP LEDs 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2 Model 3820 DCP LEDs 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3 SDCP LEDs 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-4 Top-Level Menu Status 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-5 Common Operational Messages 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-6 Dial Access Security Messages 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1 Valid Dial Command Modifiers 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-1 DTE Interface Configuration Options 9-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-2 DTE Dialer Configuration Options 9-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-3 Line Dialer Configuration Options 9-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-4 Dial Line Configuration Options 9-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-5 Leased Line Configuration Options 9-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-6 V .42/MNP/Buffer Configuration Options 9-33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-7 Test Configuration Options 9-39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-8 Miscellaneous Configuration Options 9-41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-9 Security Configuration Options 9-45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12-1 Edit Password Table Group Options 12-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12-2 Set Answer Security Group Options 12-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12-3 Set Originate Security Group Options 12-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12-4 Security Database Table Using VF-Side Passwords 12-12. . . . . . . . . . . . . . . . . . . . . . . . .

12-5 Security Database Table Using DTE-Side Passwords 12-13. . . . . . . . . . . . . . . . . . . . . . . .

12-6 Security Database Table Using Both VF-Side and DTE-Side Passwords 12-13. . . . . . . . .

12-7 Security Database Table Using Paired VF-Side and DTE-Side Passwords 12-14. . . . . . .

14-1 3800 Series AT Commands 14-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14-2 3800 Series S-Registers 14-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B-1 Result Codes B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C-1 Modem Health C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C-2 Modem – DTE Connection C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C-3 Modem – VF Connection C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C-4 Online Operation C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C-5 Leased-Line Operation C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C-6 Dial Backup Operation C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D-1 Technical Specifications for 3800 Series Modems D-1. . . . . . . . . . . . . . . . . . . . . . . . . .

E-1 VF Connector Pin Assignments: Models 3810 and 3820 E-2. . . . . . . . . . . . . . . . . . . . .

E-2 VF Connector Pin Assignments: TELCO Jacks E-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-3 EIA-232-D Pin Assignments E-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-4 EIA RS-366-A Pin Assignments E-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F-1 V.25bis Commands F-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F-2 V.25bis Response Messages F-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

G-1 Factory Default Configuration Options G-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

v3810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

vi September 1998 3810-A2-GB30-30

Preface

Objectives and Reader Assumptions

This manual describes how to install and operate the
COMSPHEREr 3800 Series standalone and
carrier-mounted modems. The reader should have a basic
understanding of modems and their operation.

How to Use This Manual

Chapter 1 provides information about the features of

3800 Series modems.

Chapter 2 provides instructions for installing the Model

3810 and Model 3820 modems.

Chapter 3 provides instructions for installing the Model

3811 modems.

Chapter 4 provides the information required to operate

the Model 3810 and Model 3820 using the diagnostic
control panel (DCP) and the Model 3811 using the
COMSPHERE 3000 Series Carrier’s shared diagnostic
control panel (SDCP).

Chapters 5 through 12 describe the eight branches of
the front panel command sets:

• Chapter 5 – Call Setup

Chapter 13 provides an overview of fax modem

operation.

Chapter 14 provides instructions for displaying and

changing AT commands and S-registers.

Appendix A provides a menu tree for 3800 Series

modems.

Appendix B provides a list of the result codes produced

by 3800 Series modems.

Appendix C provides instructions for performing

diagnostic tests when data communications problems
occur.

Appendix D provides technical specifications.

Appendix E provides EIA RS-232, EIA RS-366A, and

VF TELCO pin assignments.

Appendix F provides V.25bis dialing information.

Appendix G provides a list of all default configuration

options available for the four factory preset
configurations: Async Dial, Sync Dial, Sync Leased, and
UNIX Dial.

Appendix H provides an equipment list for 3800 Series

modems.

The Glossary provides a description of terms used
throughout this manual.

• Chapter 6 – Talk/Data

• Chapter 7 – Status

• Chapter 8 – Test

• Chapter 9 – Configure

• Chapter 10 – Control

• Chapter 11 – Remote

• Chapter 12 – Security

vii3810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Related Documents

3000-A2-GA31 COMSPHERE 3000 Series

Carrier, Installation Manual

6700-A2-GY31 COMSPHERE 6700 Series

Network Management System
User’s Guide

3610-A2-GZ45 3600 Hubbing Device

Feature Number 3600-F3-300
Installation Instructions

Contact your sales or service representative to order
additional product documentation.

Paradyne documents are also available on the World
Wide Web at:

http://www.paradyne.com
Select Service & Support → Technical Manuals

viii September 1998 3810-A2-GB30-30

Introduction

Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE 3800 Series Models 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

Overview

The COMSPHERE 3800 Series modems, a new
generation of full-feature, high-speed dial modems, offer
reliable asynchronous and synchronous operation over
dial- or leased-lines networks. The 3800 Series modems’
unique software defineability allows for the addition of
future enhancements, whether it is installing new features
or firmware upgrades.

Through its downloading capability, any 3800 Series
modem can be upgraded to the latest firmware, requiring
no new hardware investment or on-site personnel, and
little or no downtime. These modems support a wide
range of modulation schemes and offer control using
either AT commands, the user-friendly diagnostic control
panel (DCP) or the optional COMSPHERE 6700 Series
Network Management System (NMS). The NMS
performs extensive monitoring, testing, reporting, and
restoral functions to assist in managing your network.

High-speed data transfer and reliable throughput at
data rates as high as 19,200 bps (V.32terbo) over dial lines
is guaranteed by employing the latest techniques in ITU-T
V.42bis/MNP Class 5 data compression and ITU-T
V.42/MNP error correction. In addition to fast line speeds,
the modem can send data to the DTE at speeds as high as
115,200 bps.

The 3800 Series modem is extremely versatile when
used in modem pooling environments; it allows multiple
users to temporarily customize settings in the 3800 Series
modem, thereby permitting communication with the
calling modem. Upon disconnection, the 3800 Series
modem falls back to its original configuration settings and
resumes normal operation.

The modem’s compatibility with a number of dialing
methods and protocols, such as asynchronous AT
commands, ITU-T V.25bis dialing, EIA RS-366-A dialing
for carrier-mounted modems, and the user-friendly
diagnostic control panel (DCP), permits the 3800 Series
modem to be used in a variety of applications and
environments while also allowing control over modem
configuration, dialing, and diagnostics. The 3800 Series
modems offer four preset factory configurations
containing the most often used modem settings. These
factory presets provide quick configuration for any
asynchronous/ synchronous dial, synchronous leased, or
UNIXr hardware-based dial environments.

The 3800 Series family is available in three models:
the Model 3810, a 4-wire/2-wire standalone modem; the
Model 3811, a carrier - mounted version of the standalone
unit; and the Model 3820, a 2-wire standalone unit. All
three models offer a variety of modulation schemes and
network enhancements while still providing reliable,
high-speed data transmission using the latest in modem
technology.

1-13810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Features

The 3800 Series modems have a wide variety of

features.

• Dial-Line Modulations: V.32terbo (19,200 and

16,800 bps), ITU-T V.32bis (14,400, 12,000, 9600,
7200, and 4800 bps), V.32 (9600 and 4800 bps),
V.22bis (2400 bps), V.22 (1200 bps), V.21
(300 bps), Bell 212A, (1200 bps), and Bell 103J
(300 bps).

• T wo-wire/four-wire Leased-Line Modulations:

V.32terbo (19,200 and 16,800 bps), V.32bis
(14,400, 12,000, 9600, 7200, and 4800 bps),
V.32 (9600 and 4800 bps), V.22bis (2400 bps).

• Convenient migration to new or optional features

through software downloading.

• ITU-T V.42bis and MNP Class 5 data compression.

• Virtual error free data integrity with ITU-T V.42

and MNP Level 4 error control.

• Automatic and manual single call dial backup and

dial standby capabilities for 4-wire leased-line
applications (Model 3810 and Model 3811).

• A unique Paradyne modem pooling feature that

preserves the answering modem’s permanent
configuration, but allows multiple users to
temporarily adapt parameters for individual
requirements.

• Dial-line data rates from 300 bps–19,200 bps.

Leased-line rates from 2400 bps–19,200 bps.

• Asynchronous dial DTE data rates from

300 bps–115,200 bps.

• A diagnostic control panel (DCP) on the front bezel

that displays the connect status, data rate, type of
error control or compression, test results, alarm
status of DTE or VF parameters for both local and
remote modems.

• Storage of up to 10 telephone numbers to directory

locations.

• Compatibility with the industry de facto standard

AT Command set.

• Dialing via DCP, AT commands, ITU-T V.25bis

commands, or RS-366-A (Model 3811 only).

• Configuration of software options via the

AT Command set or DCP.

• High-speed transmission using asynchronous,

synchronous, or UNIX devices over full- or
half-duplex dial networks or 2-wire/4-wire leased
lines.

• Complement of self-tests, local and remote

loopbacks including ITU-T compatible V.54.

• Four factory-defined configurations and two

user-defined configuration areas.

• Availability in either the 2-wire/4-wire standalone

and carrier mount, or the 2-wire only standalone
models.

• Originate Security and three Answer Security

modes.

• Directory #1 Callback capability .

• Dial Access Security which guards against

unwanted user access to the host DTE.

• Hayes Autosync support.

Options

The 3800 Series modems also may have the following
optional features:

• Diagnostic, control, monitor, and call statistic

capabilities through the COMSPHERE 6700 Series
NMS.

• Class 2 Fax modulations: ITU-T V.17 (14,400,

12,000, 9600, 7200 bps), V.29 (9600, 7200 bps) and
V.27ter (4800, 2400 bps).

• V.29 and V.33 leased line options.

• Enhanced Throughput Cellular (ETC), which

improves reliability and speed over cellular links.

COMSPHERE 3800 Series Models

The COMSPHERE 3800 Series modem is available in
several models.

• Model 3810, a 4-wire/2-wire standalone unit

capable of operation on 2-wire dial, or 4-wire
leased or 2-wire leased lines.

• Model 3811, a 4-wire/2-wire carrier-mounted

modem for installation into a COMSPHERE
3000 Series Carrier; it is capable of operation on
dial, or 4-wire leased or 2-wire leased lines.

• Model 3820, a 2-wire standalone unit capable of

operation on dial or 2-wire leased lines.

1-2 September 1998 3810-A2-GB30-30

Model 3810 and 3820 Installation

Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3800 Series Modem Package 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Customer-Supplied Equipment 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3810 or Model 3820 Modem Installation 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3810 Dial-Line Connection 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3810 4-Wire/2-Wire Leased-Line Connection 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3820 Dial-Line Connection 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3820 2-Wire Leased-Line Connection 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DTE Connection 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3810 and Model 3820 Telephone Connection 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dial Network Management System Connection 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AC Power Transformer Connection 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Modem Power-Up 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing and Replacing Model 3810 and Model 3820 Modems 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2

Overview

The standalone Model 3810 modem (Figure 2-1) is
capable of either dial or 4-wire/2-wire leased-line
operation. The modem is controlled using either AT
commands or the diagnostic control panel (DCP). The
DCP consists of an LCD which displays the T op-Level
menu, three function keys and four directional keys which
allow you to maneuver and choose DCP selections, and a
row of 12 LED status indicators which display modem
activity . For a better understanding of DCP operation,
refer to Chapter 4, DCP Operation.

The rear of the modem contains an ON/Off power
switch, a low voltage ac power connector, an 8-pin
modular connector for phone or leased-line connection, an

8-pin modular connector for dial-line connection, a 4-pin
modular connector for network management, and a
DB-25-S DTE connector.

The standalone Model 3820 is capable of dial and
2-wire leased-line operation. Its DCP functions are similar
to the Model 3810 except it has only six LED status
indicators. For more information regarding the DCP, refer
to Chapter 4, DCP Operation.

The rear of the modem contains an ON/Off power
switch, a low voltage ac power connector, an 8-pin
modular connector for external telephone use, an 8-pin
modular connector for dial-line or 2-wire leased-line
connection, a 4-pin modular connector for network
management, and a DB-25-S DTE connector.

2-13810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

DIAGNOSTIC

CONTROL

PANEL

SPEAKER

INDICATORS

LCD AND KEYPAD

STATUS

AC TRANSFORMER

Figure 2-1. Model 3810 and 3820

3800 Series Modem Package

After opening the modem’s package, check for damage

and verify that the following items are present:

• Manual and Quick Reference

• Model 3810 or Model 3820 modem

• Power transformer

• One 6-position, 4-wire modular cord (Model 3810

and Model 3820)

EIA-232-D

INTERFACE

NMS

DIAL/LEASED (3820)

PHONE/LEASED (3810)

AC POWER IN

ON/OFF

496-13096-02

• One 8-position, 8-wire modular cord (Model 3810

only)

• One ferrite choke and cable tie

• Fax software and documentation (if fax option

installed)

If any hardware components are damaged, notify your
sales or service representative. Refer to page A in the
front of this document for contact information.

2-2 September 1998 3810-A2-GB30-30

Chapter Title

Customer-Supplied Equipment

The following customer-supplied equipment is
required to complete a data communications system using
either the Model 3810 or Model 3820 modem:

• A DTE with an available EIA-232-D serial port.

• A standard EIA-232-D male-to-female cable with a

male DB-25-S connector at one end to attach to the
modem.

• One of the following modular dial or leased

network interfaces:

— RJ11C for dial permissive applications
— An 8-position to 6-position crossover cable for

JM8 leased-line applications only

The following customer-supplied equipment is
required for the installation of a Model 3811 modem:

• A COMSPHERE 3000 Series Carrier.

• A male-to-female 50-pin mass termination cable.

One Network Interface Module (NIM) for modems
installed in Slots 1–8 and one NIM for modems
installed in Slots 9–16 (required for dial-line
applications).

• One of the following modular or 50-pin dial or

leased network interfaces:

Model 3810 or Model 3820 Modem Installation

Before installing your standalone modem, make sure
your installation site is clean and well-ventilated. Allow
space around the modem for installing cables and
telephone cords, and make sure the modem is located
within reach of the ac power outlet. The distance between
your modem and DTE should be minimized if DTE data
rates exceed 19,200 bps. Also, low capacitance cables
may be necessary for speeds greater than 19,200 bps or
distances greater than 50 feet.

The rear panel of both the Model 3810 and Model 3820
modems have the following switches and connectors (see
Figures 2-2 and 2-3):

• An ON/Off power switch.

• A 5-pin DIN type power receptacle for ac power

transformer.

• An 8-pin modular keyed jack for 4-wire/2-wire

leased lines or external telephone set on the
Model 3810. On the Model 3820, this jack is for
external telephone set use only.

• An 8-pin modular keyed jack for dial (Public

Switched T elephone Network, or PSTN) lines on
the Model 3810. On the Model 3820, this jack is for
dial or 2-wire leased lines.

— RJ11C for single line dial permissive

applications

— RJ21X for multiple line dial permissive

applications

— 66 punchdown block or other demarcation

device

• One 6-position to 6-position modular cord (required

for network management applications).

• A Shared Diagnostic Unit (SDU) (required for

network management applications).

If the modem is to be managed by a network
management system, a Shared Diagnostic Unit (SDU)
must be supplied and properly connected to the network
management controller . For proper network management
connection to the SDU, refer to the COMSPHERE
6700 Series Network Management System User’s Guide.

For installation of the 3000 Series Carrier into a
cabinet, refer to the COMSPHERE 3000 Series Carrier,

Installation Manual.

• A 4-pin modular jack for Network Management

System (NMS) connection.

• A 25-pin DB-25-S receptacle for DTE interface.

Figure 2-2 and Figure 2-3 show how Model 3810 and
Model 3820 modems are connected to certain TELCO
jack types using the supplied cables. For other TELCO
connections, refer to Appendix E.

2-33810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Model 3810 Dial-Line
Connection

For the Model 3810, use the following procedures to

connect the modem to the dial network interface:

1. Insert the 6-position, 4-conductor modular plug
into the jack labeled DIAL/LEASED (3820). See
Figure 2-2.

2. Insert the other end of the modular cord into the
dial network interface.

PHONE DIAL NMS

01

PWR

LEASED

(3810)

LEASED

(3820)

Model 3810 4-Wire/2-Wire
Leased-Line Connection

Use the following procedures to connect a Model 3810

to the leased-line network interface:

1. Insert the 8-position, 8-conductor modular plug
into the jack labeled PHONE/LEASED (3810).
See Figure 2-2.

2. Insert the other end of the modular cord into the
leased-line network interface.

3. If the Model 3810 has a dial backup line, follow
the steps listed in Model 3810 Dial-Line
Connection section.

DTE

4-CONDUCTOR PLUG

6-POSITION,

FOR TELEPHONE SET

8-POSITION,

8-CONDUCTOR PLUG

FOR LEASED LINE

NETWORK OPERATION

(CONNECTS WITH

JM8 TYPE JACK)

98-13070-02

6-POSITION, 4-CONDUCTOR PLUG FOR
PERMISSIVE DIAL NETWORK OPERATION
(CONNECTS WITH RJ11C TYPE JACK)

Figure 2-2. Model 3810 Rear Panel

2-4 September 1998 3810-A2-GB30-30

Model 3810 and 3820 Installation

Model 3820 Dial-Line
Connection

Use the following procedures to connect a Model 3820

to the dial network interface:

1. Insert the 6-position, 4-conductor modular plug
into the jack labeled DIAL/LEASED (3820). See
Figure 2-3.

2. Insert the other end of the modular cord into the
dial network interface.

PHONE DIAL NMS

01

PWR

LEASED

(3810)

LEASED

(3820)

Model 3820 2-Wire
Leased-Line Connection

Use the following procedures to connect a Model 3820
modem to the 6-pin, center pair, leased-line network
interface. For 2-wire leased line connection to a JM8
network interface, refer to Figure E-1 in Appendix E:

1. Insert the 6-position, 4-conductor modular plug
into the jack labeled DIAL/LEASED (3820). See
Figure 2-3.

2. Insert the other end of the modular cord into the
leased-line network interface.

DTE

4-CONDUCTOR PLUG

6-POSITION,

FOR TELEPHONE SET

98-13071-02

6-POSITION, 4-CONDUCTOR PLUG FOR
PERMISSIVE DIAL NETWORK OPERATION
(CONNECTS WITH RJ11C TYPE JACK)

– OR –
2-WIRE LEASED-LINE NETWORK OPERATION

(CONNECTS WITH 6-POSITION CENTER PAIR
LEASED JACK)

Figure 2-3. Model 3820 Rear Panel

2-53810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

DTE Connection

Use the following procedures to connect the
EIA-232-D cable and ferrite choke from the modem to the
DTE:

1. Make sure the modem’s rear panel power switch is
Off.

2. Connect the DB-25 plug on the cable to the DB-25
socket labeled DTE on the modem’s rear panel.
See Figure 2-4. Use a small screwdriver to fasten
the cable to the modem.

3. Connect the other end of the cable to the DTE.
Use a small screwdriver to fasten the cable to the
DTE.

T o ensure compliance with FCC Part 15 Regulations, a
ferrite choke must be installed on the EIA-232-D interface
cable.

1. Open the ferrite choke and place it around the
DTE cable as close as possible to the connector
attached to the modem.

2. Close the two halves around the cable and snap
the ferrite choke shut, pressing down on the plastic
latch to secure it.

3. Install a cable tie behind the ferrite choke to
prevent it from sliding along the cable.

DTE

Connector

Ferrite
Choke

Cable Tie

98-13144-01

Figure 2-4. Model 3810 and 3820 DTE Cable and Ferrite Choke Installation

2-6 September 1998 3810-A2-GB30-30

Model 3810 and 3820 Installation

Model 3810 and Model 3820 Telephone Connection

Use the following procedures to connect the modem to

a telephone:

1. Insert the 6-position, 4-conductor modular plug
into the jack labeled PHONE/LEASED (3810).

2. Insert the other end of the modular cord into the
telephone.

Dial Network Management System Connection

For Model 3810 and 3820 modems, use the following
procedures to connect the modem to the network
management system interface:

1. Insert the subminiature 4-conductor modular plug
of the 3600 Hubbing Device into the jack labeled
NMS.

2. Connect the 3600 Hubbing Device to the network
management system.

Modem Power-Up

Once your modem is properly connected to the DTE,
dial and/or leased lines, and ac outlet, press the modem’s
rear panel power switch to the ON position. The modem
begins a power-up self-test. This test takes several
seconds to perform, and verifies the operation of most
hardware components within the modem. If successful,
the LCD displays Power On Selftst Passed and continues
to the T op-Level menu screen.

Power On Selftst
Passed

F1

If a failure occurs during the self-test, the LCD
displays Power On Selftst Failed for several seconds.
The LCD then displays the T op-Level menu screen with
the message Power on Fail appearing on the top line of
the LCD. Although a failure has occurred, the modem will
attempt to operate. This allows you to activate a more
thorough self-test using the T est branch. Refer to
Chapter 8, Test Branch.

F2

F3

Refer to the 3600 Hubbing Device Feature Number

3600-F3-300 Installation Instructions (3610-A2-GZ45)

for more information. Installation for the Model 3810 and
3820 modems is the same as for the 3610 DSU.

AC Power Transformer Connection

Use the following procedures to connect the modem to

an ac power outlet:

1. Make sure the modem’s power switch is in the Off
position.

2. Insert the power transformer’s 5-pin DIN male
connector into the modem’s rear panel ac power
receptacle.

3. Insert the power transformer into a grounded ac
power outlet.

2-73810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Removing and Replacing Model 3810 and Model 3820 Modems

T o remove and replace a Model 3810 or Model 3820

modem, perform the following steps:

1. Make sure the modem is offline, and press the
modem’s rear panel power switch to the Off
position.

2. Disconnect the power cord from the ac power
outlet, and then from the connector on the rear of
the modem.

3. Disconnect the dial and leased-line modular cords
from the modem’s rear panel.

4. Disconnect the DTE interface cable from the
modem’s rear panel.

If the modem is to be removed for service, return
it using the procedures on page A in the front of
this document for contact information.

5. Install the replacement modem as described in the

Model 3810 or Model 3820 Modem Installation

section of this chapter, and configure it the same
way as the modem being replaced.

2-8 September 1998 3810-A2-GB30-30

Model 3811 Installation

Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3811 Installation 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing and Replacing Model 3811 Modems 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Overview

The carrier-mounted Model 3811 modem (Figure 3-1)
is capable of dial or 4-wire/2-wire leased-line operation
and installs into a COMSPHERE 3000 Series Carrier. The
Model 3811’s faceplate has 16 LED status indicators for
displaying modem activity and an audio speaker jack for
the carrier’s optional speaker .

The Model 3811 modem’s rear has two DTE edge card
connectors that mount into a connector plate located on
the rear of the carrier. This connector plate has two
DB-25-S connectors, one providing an EIA RS-232 DTE
interface and one providing an EIA RS-366A DTE
interface. The Model 3811 derives ac power from the
COMSPHERE 3000 Series Carrier’s backplane which is a
common bus to all devices installed in the carrier. The
user interface to any Model 3811 is through the shared
diagnostic control panel (SDCP), an optional feature

similar to the DCPs on the Model 3810 and Model 3820.
For a better understanding of DCP operation, refer to
Chapter 4, DCP Operation.

The COMSPHERE 3000 Series Carrier has a total of
17 slots. The first slot, Slot 0, is reserved for the Shared
Diagnostic Unit (SDU) while the remaining 16 slots can
house up to 16 Model 3811 modems, or for mixed
networks, a combination of Model 3811 modems and
Model 3611 Data Service Units (DSUs). An SDU is a
circuit card that provides SDCP and network management
interfaces to modems and DSUs installed in the carrier.
SDUs are only required if a single SDCP is used by
multiple COMSPHERE 3000 Series Carriers in a cabinet
or if a network management system (NMS) is used.

For more details on the COMSPHERE 3000 Series
Carrier, refer to the COMSPHERE 3000 Series Carrier,
Installation Manual.

3-13810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

FACEPLATE

Status

Pwr
Alrm

142

Tes t
Dial

125

RI
Busy

Serv

SQ

103

TXD

104

RXD

105

RTS

106

CTS

107

DSR

108

DTR

109

LSD

Front Panel

Spkr

EIA-232/V.24

CONNECTOR

EIA-232/V.24
EDGE CARD

CONNECTOR

RS-366A/V.25

EDGE CARD

CONNECTOR

REAR

CONNECTOR

PLATE

RS366A/V.25 (3800) EIA232/V.24

RS-366A/V.25
CONNECTOR

V.35 (3600/3500)

3811

496-13155-02

Figure 3-1. Model 3811

Model 3811 Installation

The Model 3811 is designed for installation in a
COMSPHERE 3000 Series Carrier which supplies
operating power and the dial and/or leased-line network
connections. For correct power, DTE, dial-line,

leased-line, NIM, and network management cabling
information, refer to the COMSPHERE 3000 Series
Carrier , Installation Manual.

The COMSPHERE 3000 Series Carrier has 17 slots
which can hold up to 16 modems and one Shared
Diagnostic Unit (SDU). The SDU is required when the
modems in the carrier are controlled by an NMS, or when
multiple carriers in a cabinet configuration are to be
controlled by a single shared diagnostic control panel
(SDCP). The SDCP of the COMSPHERE 3000 Series
Carrier is the user interface to the Model 3811 modem. A
single SDCP can control up to eight carriers containing up
to 128 compatible modems.

3-2 September 1998 3810-A2-GB30-30

Model 3811 Installation

The installation of a Model 3811 varies slightly if an
SDCP is installed on the front of the carrier. To install a
Model 3811 modem into the carrier without an SDCP,
perform the following steps:

CAUTION

If the Model 3811 is removed
from the carrier, always use a
ground strap when handling
the modem. Always store the
Model 3811 in an antistatic
bag when it is removed from
the carrier.

1. At the rear of the carrier install the rear connector
plate. Make sure the plate uses the same slot
position as that intended for the modem.

Loosely fasten the plate. This allows for slight
adjustments later when installing the modem.

2. At the front of the carrier, hold the modem
vertically , with the latch on its faceplate in the
open position, and insert it into the top and bottom
card guides of one of the slots numbered 1–16 (see
Figure 3-2).

Slide the modem into the slot, aligning the modem
with the rear connector plate, until the backplane
connector and DTE connector seat firmly into the
back of the carrier. The faceplate latch
automatically closes as you push the modem into
the carrier. To lock the modem into the carrier,
press the faceplate latch until a click is heard.

3. If the carrier is ON, the Power LED on the
faceplate of the 3811 lights. After several seconds
the modem completes its power-up self-test in
which all faceplate LEDs light. If the modem fails,
the Alrm LED on the faceplate flashes.

Return to the rear of the carrier and tighten the
rear connector plate.

Figure 3-2. Installing a Model 3811 Modem

3-33810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

If the modem is to communicate with an installed
SDCP, install the modem as described above and perform
the following steps:

1. Press the

key on the SDCP. The cursor

Select

appears in the carrier selection entry.

2. Press the F1 (") or F2 (↓) key until the carrier

number you want appears on the LCD.
The carrier number selection has a range of 1 to 8

since a single SDCP can control a configuration of
up to eight carriers. (This is only possible if the
SDU is installed.)

3. Press the

key to position the cursor on the slot

selection entry.

4. Press the F1 (") or F2 (↓) key until the slot

number (1–16) you want appears on the LCD.
Ignore the AB designator that appears on the LCD
since it is not applicable to the 3800 Series
modems.

5. Press the

key to place the SDCP in direct

Select

communication with the selected modem.
The LCD displays the T op-Level menu for the

selected modem. In addition, the Front Panel LED
on the modem’s faceplate and the OK LED on the
SDCP light.

6. Once you have determined that the modem is
installed properly and completed its power-up
self-test, rotate the circuit pack lock until it covers
the faceplate latch (Figure 3-3). This prevents the
modem from accidently being removed once it is
installed in a carrier.

CIRCUIT

CARD

GUIDE

CLOSED

(LOCKED)

OPEN

(UNLOCKED)

CIRCUIT

PACK
LOCK

LATCH

CIRCUIT

CARD

GUIDE

495-11985a-03

Figure 3-3. Circuit Pack Lock

Removing and Replacing Model 3811 Modems

It is not necessary to power down the carrier to remove
and replace a Model 3811 modem. Perform the following
steps:

7. Configure the modem as described in the Selecting
Factory Configuration Options section in
Chapter 4.

If the Model 3811 is removed
from the carrier, always use a

CAUTION

ground strap when handling
the modem. Always store the
Model 3811 in an antistatic
bag when it is removed from
the carrier.

1. Rotate the circuit pack lock until the release tab is
exposed.

2. Press down on the release tab and pull the modem
away from the carrier’s backplane.

3-4 September 1998 3810-A2-GB30-30

DCP Operation

Overview 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostic Control Panels 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Models 3810 and 3820 Diagnostic Control Panels 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 3811 Faceplate and Shared Diagnostic Control Panel 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Status Indicators 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostic Control Panel Operation 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LCD Display 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hidden Choice Indicators 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Keypad 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Menu Structure 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Top-Level Menu Status and Operational Messages 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Selecting Factory Configuration Options 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Diagnostic Control Panel 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using AT Commands 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

Overview

This chapter describes how to use the diagnostic
control panel (DCP) of the 3800 Series modem. It also
describes how to select and use each branch of the
T op-Level menu tree.

Diagnostic Control Panels

There are two types of DCPs: the front panel on the
standalone Model 3810 and Model 3820 modems, and the
shared diagnostic control panel (SDCP), an optional
feature used with a Model 3811 installed in a
COMSPHERE 3000 Series Carrier. Both DCPs have a
two-line, 32-character liquid crystal display (LCD) and
keypad through which T op-Level menu branches are
accessed to perform the following:

• Initiate and disconnect dial operations

• Check modem status

• Set up configuration options

• Initiate diagnostic tests

The LCD displays the result of any command initiated
using the DCP. Most of these operations can be performed
from an attached asynchronous DTE using the
AT command set.

Models 3810 and 3820 Diagnostic Control Panels

The DCPs of the Model 3810 and Model 3820 modems
(Figures 4-1 and 4-2) contain status indicators,
pushbutton-type keys, and an LCD.

• Access remote modems through the local modem’s

DCP

4-13810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

COMSPHERE 3810

COMSPHERE 3820

F1 F2

DTR

PWR ALRM

DIAG

108 142

CTS TXD LSD RXD TEST

109

103

106

105

Figure 4-1. Model 3810 DCP

F1 F2

CTS TXD LSD RXD

RTS

109

103

106

105

104

104

F3

SQRTS

RATE

496-13067-02

F3

SQ

Figure 4-2. Model 3820 DCP

496-13068-02

4-2 September 1998 3810-A2-GB30-30

DCP Operation

Model 3811 Faceplate and Shared Diagnostic Control Panel

The SDCP, is used to manage carrier-mounted Model
3811 modems. Use the SDCP to issue commands to, view
and select configuration options on, or monitor tests for a
specific Model 3811 modem.

Status

OK
Alrm

Diag

In

Diag

Out

Status

142

125

103
104
105
106
107
108
109

Front Panel

Spkr

Pwr
Alrm
Test
Dial
RI
Busy

Serv

SQ

TXD
RXD
RTS
CTS
DSR
DTR
LSD

The faceplate of the Model 3811 contains LED status
indicators that monitor the operation of the modem. After
the SDCP is connected to the modem, the Front Panel
indicator of the selected modem lights to show that the
modem is connected.

Figure 4-3 shows the SDCP and the Shared Diagnostic
Unit (SDU) it interfaces with.

SDU

3811

SDU12345678910111213141516

SELECT

KEY

OK Alarm BckUp Test EC

STATUS

INDICATORS

NETWORK

DEVICE

ALARM

DIAL

BACKUP

CARRIER SLOTS 1–16

Select

OK Alarm BckUpTest EC

ERROR

CORRECTION

TEST

MODE

F1 F2 F3

KEYPAD

COMSPHERE 3000

LCD

496-13073-03

Figure 4-3. Optional SDCP, Model 3811 Faceplate, and Optional SDU

4-33810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Status Indicators

The 3800 Series modems’ status indicators
continuously provide information on the modem’s
operating condition. All of the status indicators on the
Model 3810 and Model 3820 appear on the DCP
(Figures 4-1 and 4-2), whereas the status indicators for the
carrier-mounted Model 3811 are located on the

Model 3811’s faceplate, the SDCP, and the SDU faceplate
(Figure 4-3).

The standalone Model 3810 modem’s DCP has
12 LEDs, and the carrier-mounted Model 3811 has
16 LEDs. These LEDs are listed and described in
T able 4-1; LEDs specific to one model type have the
appropriate model number shown in the table.

Table 4-1

Model 3810 and Model 3811 DCP LEDs

Label

Pwr green ON. Power is on and the modem is capable of operating.
Alrm red

Diag

(3810 only)

DTR/108 green The DTE has turned ON DTR or the modem has forced DTR ON.
Test/142 yellow The modem is involved in a test. Normal operation is not possible.
Dial

(3811 only)

Color Indicates

Flashing. A malfunction has been detected in either the modem or COMSPHERE
3000 Series Carrier.

green The modem has responded to a diagnostic command from network management.

green Flashing. The modem is attempting to establish a call over the dial network.

ON. The modem has established a dial connection.
OFF. A dial connection does not exist.

RI/125

(3811 only)

Busy

(3811 only)

Serv

(3811 only)

SQ yellow The receive telephone line signal is degraded.
TXD/103 green The modem is receiving data from the DTE to transmit. (ON equals space.)
RXD/104 green Data is being transferred to the DTE. (ON equals space.)
RTS/105 green RTS signal is ON.
CTS/106 green CTS signal is ON.
LSD/109 green The modem has detected a valid carrier signal and is capable of transferring data to the

DSR/107

(3811 only)

Rate

(3810 only)

Front Panel

(3811 only)

green A ringing signal is being received.

yellow ON. The modem is placed in a forced busy condition and is off-hook.

yellow ON. The modem is connected to the carrier service line rather than the normally assigned

dial network.

DTE.

green DSR signal is ON.

yellow ON. The modem is connected at a data rate lower than the data rate it is configured for.

OFF. The modem is connected at its configured data rate.

yellow ON. The modem is connected to the carrier’s SDCP.

4-4 September 1998 3810-A2-GB30-30

DCP Operation

DCP LEDs for the standalone Model 3820 are listed

The SDCP LEDs are listed and described in T able 4-3.

and described in T able 4-2.

Table 4-2

Model 3820 DCP LEDs

Label Color Indicates

RTS/105 green RTS signal is ON.
CTS/106 green CTS signal is ON.
TXD/103 green The modem is receiving data from the DTE to transmit. (ON equals space.)
LSD/109 green The modem receiver has detected a valid carrier signal and is capable of transferring data to

the DTE.

RXD/104 green Data is being transferred to the DTE. (ON equals space.)
SQ yellow The receive telephone line signal is degraded.

Table 4-3

SDCP LEDs

Label

OK green Power is ON and the modem is capable of operating.
Alrm red The modem has detected a problem with its operation. For example, the modem failed a

BckUp yellow The modem, originally configured for leased-line operation, is now operating on dial

Test yellow The modem is involved in a test. Normal operation is not possible.
EC green Modem is in Error Control mode.

Color Indicates

self-test.

networks in a Dial Backup mode.

4-53810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Diagnostic Control Panel Operation

The 3800 Series modem’s diagnostic control panel
(DCP) is the user interface to all functions used to
configure and control the modem. This interface includes
the status light-emitting diodes (LEDs), and a two-line,
32-character liquid crystal display (LCD) and keypad
(Figure 4-4).

Use the DCP to display the following kinds of
information:

• Operational status

• Configuration options

• DCP entry displays

• Remote modem access

MOVES UP
ONE LEVEL

FROM CURRENT

DISPLAY

Idle:19.2
Call_Setup

LCD
TOP

LINE

HIDDEN

CHOICE

INDICATORS

RETURNS
DISPLAY TO
TOP-LEVEL

MENU

Hidden Choice Indicators

The Hidden Choice Indicators serve as an alert that
other selections are available besides what is currently
displayed on the LCD. These indicators appear as one of
the following symbols:

Right Scroll Indicator >

The right scroll indicator displays when more choices

are available to the right of what is currently displayed

on the LCD.

Left/Right Scroll Indicator

The left/right scroll indicator displays when more

choices are available to the left and right of what is

currently displayed on the LCD.

Left Scroll Indicator <

The left scroll indicator displays when more choices

are available to the left of what is currently displayed

on the LCD. The LCD does not wrap around to the first

choice once you have reached the end of choices.

Remote Mode Indicator

If the local 3800 Series modem establishes a

connection with the remote 3800 Series modem via the

Remote branch, then

choice indicator on both modems.

appears in place of the hidden

F3

RIGHT

SCROLL

KEY

LEFT

SCROLL

KEY

LCD BOTTOM LINE

F1

F2

FUNCTION KEYS

Figure 4-4. 3800 Series LCD and Keypad

LCD Display

The LCD consists of a top line and bottom line, with
each displaying a maximum of 16 characters at a time. If
additional information appears on the LCD than what is
currently displayed, a hidden choice indicator
(<

>) appears in the upper right-hand corner of the
LCD. Use the
direction to display more selections onto the LCD.

or key to scroll in the indicated

Keypad

The DCP on the Model 3810 and Model 3820 has
seven keys while the optional SDCP of the COMSPHERE
3000 Series Carrier has eight keys. The additional key on
the carrier is the
to a specific slot in the carrier.

Key

The

key returns you to the T op-Level menu

display from anywhere in the menu tree.

Pressing while changing configuration options
displays the message Save Straps? Yes No. If No is
selected, changes made to configuration options are not
saved and the T op-Level menu appears. If Yes is selected,
then changes are saved to either Active (Saved),
Customer 1, or Customer 2 configuration areas.

key, used to connect the SDCP

Select

4-6 September 1998 3810-A2-GB30-30

DCP Operation

Key

The

key moves you up one level in the menu tree.

and Keys

Use the

and keys to move the viewing
window left or right and to scroll the remaining
branches and selections into view. A maximum of
three selections can be displayed at one time.

These keys also allow you to move the cursor one

character to the left or right on data entry displays; for
example, to allow entry of one digit at a time.

F1, F2, F3 Keys
Function keys select the LCD choice that appears

above the function key; they are labeled F1, F2, and
F3. If a selection spans more than one function key,
then any of those keys choose that selection.

Key (Model 3811 only)

Select

The

key appears on the optional SDCP of the

Select

COMSPHERE 3000 Series Carrier. It is used to
connect the SDCP to a modem in a specific slot in the
carrier.

Menu Structure

The menu tree is a hierarchical structure used to

display functions that configure and control local and
remote 3800 Series modems. It is accessed via the DCP
and is shown in Appendix A.

The menu tree contains the following branches:

Call Setup

Used to dial, disconnect, and



answer telephone calls as well
as store up to 10 telephone
numbers in directory locations.
(See Chapter 5.)

Talk/Data

Used to switch the modem



between T alk mode (the
modem is disconnected from
the VF line) and Data mode
(the modem is connected to
the VF line) when dialing via
either the DCP or the attached
telephone. (See Chapter 6.)

Status

Used to monitor the current



status of the VF line and DTE
interface as well as view the
identity of the modem. (See
Chapter 7.)

Test

Used to begin and end various



modem tests. (See Chapter 8.)

Configure

Used to change and save the



modem’s configuration
options. (See Chapter 9.)

Control

Used to control the modem’s



hardware and software
functions. (See Chapter 10.)

Remote

Used to access and control a



remote 3800 Series modem.
(See Chapter 11.)

Security

Used to control the modem’s



dial access security. Appears
only if the optional security
feature is installed. (See
Chapter 12.)

Menu tree branches are described in Chapters 5
through 12. Functions that appear on the LCD vary
depending upon the type of model installed, its operating
mode, and software configuration.

“Status”

Call_Setup Security

Tlk/Data Status Test Configure Control Remote

494-13083-02

4-73810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Top-Level Menu Status and Operational Messages

The LCD’s top line identifies the modem status, as listed
in Table 4-4, while the bottom line displays the main
menu tree branches and operational and dial access

Access to all menu tree branches from the DCP begins

security messages, as listed in T able 4-5 and Table 4-6.

at the T op-Level menu, the head of the menu hierarchy.

Table 4-4

(1 of 3)

Top-Level Menu Status

Normal Operation

Status Message

Fax Rx:MR* Indicates that the modem is online, in fax receive modem, operating at the displayed data rate.
Fax Tx:MR* Indicates that the modem is online, in fax transmit mode, operating at the displayed data rate.
Idle:MR* The modem is configured for dial network operation and is on-hook.
Leased:MR* The modem is operating on leased lines at the displayed data rate.
OnLine:MR* EC** Indicates the modem is online, in Data mode, and operating at the displayed data rate. EC (error

control) displays if error control is operational.
Ring Indicate The local modem is receiving an incoming ring.
Test:MR* The modem is in test mode operating at the displayed data rate.

Indicates

Alarm Status

Message***

Make Busy Indicates the modem is in a Make Busy condition.
Power On Fail Indicates the modem has failed its Power-On Self-Test.
Self Health Fail Indicates a failure in the modem’s hardware components.
Weak Battery Indicates the battery is operating below 2 volts. Contact your sales or service representative.

Normal Call

Setup Messages

Off Hook The modem is off-hook and waiting to dial a telephone number.
Dialing The remote modem is ringing.
Training The modem is training or retraining.
EC Negotiating The local and remote modems are negotiating the highest possible level of error control

compatible between both modems. Once a level is selected, this LCD message disappears.

*MR. Modem Rate indicates the data rate the modem is using. One of the following values appears: 300, 1200, 2400,

4800, 7200, 9600, 12K (12,000), 14.4 (14,400), 16.8 (16,800), or 19.2 (19,200) bps.

** EC. Error Control indicates the modem is online and using V.42 or MNP error control. One of the following values

appears after the modem rates listed above: MNP2, MNP3, MNP4, MNP5, V42, V42b, or NoEC. (NoEC indicates the
modem is connected in Buffer mode rather than error control. If an EC value does not appear , then the modem is in
Direct mode.)

***The Alarm Status Messages only appear when the Normal Operation Status Messages display; the LCD alternates

between the two message sets.

Indicates

Indicates

4-8 September 1998 3810-A2-GB30-30

Table 4-4

(2 of 3)

Top-Level Menu Status

DCP Operation

Call Failure

Messages

Busy Signal The answering modem is busy.
Dial Line in Use The modem is already operating on dial networks when another call attempt has been issued.
Invalid Number The modem has dialed a telephone number not stored in a directory location.
No Answer Tone The answering modem has not answered within the time limit specified by the No Answer

Timeout configuration option.
No Dial – DTR The modem cannot dial because DTR is Off.
No Dial – Test The modem cannot dial because it is running a Test.
No Dial Tone The modem has aborted the call because it cannot detect a dial tone.
No Quiet Answer The modem has detected No Quiet Answer (@) before the time-out setting of the No Answer

Disconnect configuration option.
Trunk Busy The modem is receiving a fast (trunk) busy.

Call Disconnect

Messages

ATH Disconnect The modem has disconnected due to an A TH command.
Bad Lines Disc The modem has disconnected because the lines do not support the modulation and/or data rate

selected.

Indicates

Indicates

No Carrier Disc The modem disconnects due to the loss of carrier signal from the remote modem.
DTR Disconnect The modem has disconnected due to the loss of DTR from the DTE.
EC Disconnect The modem has disconnected due to failure to negotiate Error Control mode.
Inv Rate Disc When using V.32bis modulation, the remote modem does not support the data rate used by the

local modem.
LnCurrnt Disc The modem has disconnected due to the loss of line current.
LongSpace Disc The modem has disconnected due to the detection of a long space.
NoData Disc The modem has disconnected due to a lack of transmitted and received data.
Disconnecting The modem has begun the disconnect sequence.
Rmt Cmnded Disc The modem has disconnected due to a V.32 Cleardown received from the remote modem.
Talk Mode The modem is in Talk mode.

4-93810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 4-4

(3 of 3)

Top-Level Menu Status

Dial Backup

Messages

Dial Standby The modem is operating in Dial Standby mode.
DialBckUp:MR* The modem is operating in a Dial Backup mode at the displayed data rate and is configured for

Direct mode.
Backup:MR* EC** The modem is operating in Dial Backup mode and is configured for error control and data

compression on leased lines.
Stndby:MR* EC** The modem is operating in Dial Standby mode and is configured for error control and data

compression on leased lines.

Indicates

Firmware

Download Result

Indicates

Messages

DownldOnly Mode Indicates that a local download of firmware or a remote cloning of firmware has failed. The

modem is currently in a Download Only mode in which only another download attempt is possible.
Frmware Upgrade Indicates that a local download of firmware or a remote cloning of firmware was successful.
RemClone Failed Displays on the local modem’s LCD and indicates that a remote cloning of firmware has failed.
Remote Clone OK Displays on the local modem’s LCD and indicates that a remote cloning of firmware was

successful.

AT Command

Reset Message

Indicates

Reset by AT
command

* MR. Modem Rate indicates the data rate the modem is using. One of the following values appears: 300, 1200, 2400,

4800, 7200, 9600, 12K (12,000), 14.4 (14,400), 16.8 (16,800), or 19.2 (19,200) bps.

** EC. Error Control indicates the modem is online and using V.42 or MNP error control. One of the following values

appears after the modem rates listed above: MNP2, MNP3, MNP4, MNP5, V42, V42b, or NoEC. (NoEC indicates the
modem is connected in Buffer mode rather than error control. If an EC value does not appear , then the modem is in
Direct mode.)

The modem has performed a reset in response to an A TZ command.

4-10 September 1998 3810-A2-GB30-30

Messages listed in Table 4-5 are common operational
messages that occur during modem operation. These
messages normally appear on the second line of the LCD.

Table 4-5

Common Operational Messages

Common

Operational

Indicates

Messages

Please Wait... Appears when a command to a local device takes more than two seconds to complete.
Command Sent... Appears when a command is sent to a remote modem.

DCP Operation

No Rem Response or
Remote Modem Fail

Command Complete Appears when a command, issued to a local or remote modem, is completed.
Invalid Command Appears when the modem cannot complete a command.

Appears when a remote modem does not respond to a command within 5 seconds.

4-113810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Messages listed in T able 4-6 are dial access security
messages that can occur when the optional security
feature is installed.

The Top-Level menu’s main branches appear on the
LCD in the order of Call Setup, T alk/Data, Status, Test,
Configure, Control, Security, and Remote. These branches
are described in the following chapters.

Table 4-6

Dial Access Security Messages

Dial Access

Security

Indicates

Messages

Get VF PsWd The answering modem is waiting for the originating caller to transmit a VF password.
Get DTE PsWd The answering modem is waiting to receive a valid DTE password from the remote DTE.
VF PsWd Timeout The modem did not finish answering a call (disconnected) because the allowed time limit was

exceeded before the modem received a VF password from the originating dialer.

Unknown DTEpswd The modem did not finish answering a call (disconnected) because the DTE passwords received

from the remote DTE were invalid.

No Orig PsWd The modem did not attempt to establish a call as requested because the AT dial command did not

contain an originate access password.

Unknown VF PsWd The modem did not finish answering a call (disconnected) because the modem received an

invalid VF password.

DTEpswd Timeout The modem did not finish answering a call (disconnected) because the allowed time limit was

exceeded before the modem received a DTE password from the remote DTE.

Inval Orig PsWd The modem did not attempt to establish the call as requested because the originate password in

the A T dial command was not valid.

DTR Dial Blocked Appears if DTR dialing is used and Answer Access or Originate Access security is enabled. DTR

dialing is not permitted when security is enabled.

SecurityBlocked Appears only when the modem is in base mode (a mode that occurs during a firmware download)

and Answer Access Security is enabled. In this case, the access verification capabilities are not
available and the modem does not pass data to the DTE under any circumstances.

4-12 September 1998 3810-A2-GB30-30

DCP Operation

Selecting Factory Configuration Options

After the modem passes the power-up self-test,
configure it for operation using one of the factory preset
configurations.

The 3800 Series modems have several factory preset
templates that contain the most commonly used
configuration options (straps) for Asynchronous Dial,
Synchronous Dial, Synchronous Leased (Answer or
Originate), UNIX hardware network, cellular mobile, and
cellular PSTN configurations. Your modem is shipped
from the factory with the Async Dial default configuration
options stored in memory. If Sync Dial, Sync Leased,
UNIX Dial, or Cellular is more appropriate for your
configuration, then you must change the factory setting
using either the modem’s DCP or the AT command set as
described in the following sections.

The preset configuration gives you a “head start” in
getting your modem operating and reduces the amount of
time required to configure your modem. For a better
understanding of DCP operation and factory preset
configuration options, refer to Chapter 9, Configure
Branch.

Using the Diagnostic Control Panel (DCP)

The DCP’s liquid crystal display (LCD) consists of two
16-character lines which display modem status, control
functions, and configuration options as well as indicating
your location in the T op-Level menu tree (Appendix A).

4. Press the
preset appears on the LCD, and press the
corresponding function key to select your choice.

5. Choose Function appears and displays the Edit
and Save functions.

6. Press the F3 key (Save) to save the new factory
preset configuration to one of three configuration
areas, Active (Saved), Customer 1, or
Customer 2.

(These three configuration areas are nonvolatile
memory locations. Active (Saved) contains the
most recently saved changes to any configuration
options. In the event of power loss, the modem
retrieves these configuration options. Customer 1
and Customer 2 are user-defined configuration
areas.)

The LCD now displays Sav EditArea to.

7. Press the
configuration area appears on the LCD, then press
the corresponding function key to select your
choice. (Saving configuration options to the
Active (Saved) configuration area automatically
saves them to the Active (Operating)
configuration area.) The LCD displays Command
Complete.

8. The modem is now configured with the selected
factory template. Press the

T op-Level menu.

key until the appropriate factory

key until the appropriate

key to return to the

T o change the factory template using the DCP, perform

the following steps:

1. On the DCP press the
comes into view.

2. Press the function key below Configure to select
the Configure branch.

The LCD now displays Ld EditArea frm.

3. Press the
then press the F1 key to display the factory preset
configurations.

Factory preset configurations are Async Dial,

Sync Dial, Sync Leased, UNIX Dial, Cellular
(Mobile), and Cellular (PSTN). If Sync Leased is
selected, you must choose either Answer or
Originate mode.

key until Factory comes into view,

key until Configure

Refer to Chapter 9, Configure Branch, for more
information regarding default factory configuration
options.

Using AT Commands

When using AT commands, the following criteria must
be met:

• Make sure the asynchronous DTE’s communication

software is configured for 10-bit character format
(for example, 8 data bits, no parity, and 1 stop bit).

• Make sure the DTE (RS-232D) cable is attached to

the DTE connector on the rear of the Model 3810
or 3820 modem, or (for the Model 3811 modem)
the rear of the COMSPHERE 3000 Series Carrier,
and the correct serial communications port on the
asynchronous DTE.

4-133810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

• On initial power-up, the modem is in Command

mode. T o verify that the modem is connected and
functioning properly , enter the following:

TYPE: AT
PRESS: Return (Enter)

The screen displays OK.

If the modem does not return OK, refer to Appendix C,

Troubleshooting.

NOTE

If you have already changed the
factory preset configuration you
may have lost AT command
control. To regain AT command
control, select, via the DCP, the
Async Dial factory preset
configuration as described
earlier in Using the Diagnostic
Control Panel (DCP).

T o change a factory template using AT commands,
perform the following steps (for more information on
changing factory templates using AT commands, refer to
Chapter 14, AT Command Set and S-Registers).

1. Use the AT&F&W command to load the
appropriate factory configuration to the
appropriate storage area. Enter the following:

(NOTE: &F1, &F2, and &F4 remove AT
command control. The only way to return to AT
command control is through the DCP as described
earlier in Using the Diagnostic Control Panel
(DCP).)

and
Where: n is one of the following storage areas:

0 for Active (Saved)
1 for Customer 1
2 for Customer 2

(NOTE: These three configuration areas are
nonvolatile memory locations. Active (Saved)
contains the most recently saved changes to any
configuration options. In the event of power loss,
the modem retrieves these configuration options.
Customer 1 and Customer 2 are user-defined
configuration areas.)

PRESS: Return (Enter)

2. The selected factory configuration is saved.

The &V (View) command can be used to display the
configuration options in effect. The output of the &V
command can be saved to a file and printed (using your
communications software), providing both a record of
your configuration and a worksheet for configuration
enhancements. Refer to Chapter 14, AT Command Set and
S-Registers, for more on AT commands.

TYPE: AT&Fy&Wn
Where: y is one of the following Factory

configurations:

0 for Async Dial
1 for Sync Dial
2 for Sync Leased (Answer)
3 for UNIX Dial
4 for Sync Leased (Originate)
5 for Cellular (Mobile)
6 for Cellular (PSTN)

4-14 September 1998 3810-A2-GB30-30

DCP Operation

Diagnostic Control Panel Security Access

NOTE

This page of the manual is
self-supporting and can be
removed to prevent unwanted
knowledge of the DCP security
access selections.

Use the DCP security access function to ‘‘lock” the
DCP of any 3800 Series modem and prevent unwanted
user access. T wo options are available for this function:
Grant and Deny.

Grant allows any branch of the T op-Level menu to be
accessed from the DCP. Deny allows access only to the
Status branch of the T op-Level menu. All 3800 Series
modems are shipped from the factory with DCP access
granted.

T o access the Front Panel (DCP) Security Access

function, perform the following:

Press the
Press the

Press the

key three times.
key twice.

key once.

Frnt Panl Acces
Grant Deny

F1

F2

F3

Select Grant to allow access or select Deny to lock

DCP access.

Either selection results in a return to the T op-Level

menu.

4-153810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

4-16 September 1998 3810-A2-GB30-30

Call Setup Branch

Overview 5-1ă. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Call Setup Branch 5-2ă. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dial 5-2ă. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Disconnect 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Answer 5-3ă. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dial Standby/Return to Dial 5-4ă. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Change Directory 5-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Entering Telephone Numbers and Dial Command Modifiers into Directory Locations 5-5. . . . . . . .

5

Overview

The Call Setup branch of the T op-Level menu allows
you to dial, disconnect, and answer telephone calls. It also
allows you to create and store up to 10 telephone numbers
to directory locations. Six different functions can appear
under Call Setup: Dial, Disconnect, Answer, Dial Standby
or Return to Dial (when applicable), and Change
Directory.

Tlk/Data Status Test Configure Control Remote

Call_Setup

Dial

Disconnect

Answer

Change_Directory

Dial_Standby

or

Return_to_Dial

NOTE

The Dial Standby and Return to
Dial functions only appear when
the modem is in Dial Backup
mode. If the Model 3820 is
operating on leased lines,
Change Directory is the only
function available.

“Status”

Security

494-13084-02

Directory Locations 1 – 10

5-13810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Call Setup Branch

In the following descriptions, the shaded key indicates
what key to press to perform the described operation.

To access the Call Setup branch from the Top-Level
menu, select Call_Setup:

Idle: 19.2 >
Call_Setup

F1

F2

Dial

Dial allows you to dial any telephone number stored in
directory locations 1–10. Any telephone number dialed
using the DCP must already exist in a directory location.
Refer to Change Directory for information on storing
telephone numbers in directory locations.

T o access Dial from the Call Setup branch, make the
following selection:

F3

Select Dial to display the first directory telephone

number.

Dial Directory:
Nxt 01:5551234

F1

F2

F3

T o view other directory locations, select Nxt.

Dial Directory: 01
Dialing

F1

F2

F3

Once the directory location you want appears on the

LCD, press the F2 or F3 key to dial the number.

If the connection is successful, the modem is online
and one of the Normal Operation status messages appears
on the LCD. If the connection is not successful, the LCD
displays one of the Call Failure status messages. (See
T able 4-4 in Chapter 4.)

Call Setup: >
Dial Disconnect

F1

F2

F3

AT Command Equivalent

The AT command equivalent for Dial is DS=n, where n
is directory location 1–10.

5-2 September 1998 3810-A2-GB30-30

Call Setup Branch

Disconnect

Disconnect allows the modem to go on-hook (hang
up). Use this function when you want to disconnect an
established call on a dial line.

NOTE

When the Model 3820 is
configured for leased-line
operation, this function is not
available and is not displayed on
the LCD.

T o access Disconnect from the Call Setup branch,
make the following selection:

Call Setup: >
Dial Disconnect

F1

Select Disconnect.

F2

F3

Answer

Answer allows the modem to go off-hook, generate an
answer tone, and begin the handshaking process with the
calling modem. Use the Answer function when the
Auto-Answer Ring Count configuration option is
disabled. (See the Line Dialer section in Chapter 9.)

NOTE

When the Model 3820 is
configured for leased-line
operation, this function is not
available and is not displayed on
the LCD.

T o access Answer from the Call Setup branch, make
the following selections:

Call Setup:
Answer

F1

F2

F3

Disconnect
Command Complete

F1

F2

F3

The modem goes on-hook (hangs up) and the call is

disconnected. This includes any calls being used for dial
backup of leased lines. The Command Complete status
message is displayed.

To exit this function and remain in the Call Setup

branch, press the
T op-Level menu, press the

key. To exit and return to the

key.

AT Command Equivalent

The AT command equivalent for Disconnect is H or

H0.

Press the key until Answer is displayed. Select
Answer.

Answer
Command Complete

F1

F2

F3

The modem goes off-hook and attempts to establish a
connection in Answer mode. The Command Complete
status message appears on the LCD.

To exit this function and remain in the Call Setup
branch, press the

T op-Level menu, press the

key. To exit and return to the

key.

AT Command Equivalent

The AT command equivalent for Answer is A.

5-33810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Dial Standby/Return to Dial

The Dial Standby and Return to Dial functions appear
on the LCD only after the Model 3810 or Model 3811,
operating on leased lines, is placed into dial backup. Once
the modem is operating in Dial Backup mode, these
functions allow the modem to be switched back and forth
between dial and leased-line operation while still
maintaining the dial connection. See Figure 5-1.
(Switching between dial and leased-line operation can be
performed manually or automatically by enabling the
Auto Dial Standby configuration option.)

For example, under normal dial backup conditions,
when a problem occurs on the leased line, the modems
establish a connection over the dial network using a
telephone number stored in directory location 1.

Call Setup:
Dial Standby

F1

F2

When this occurs, the Dial Standby function now
appears on the LCD. By selecting this function, the
modem switches back to the leased line while still
maintaining the dial connection. As a result, the Return to
Dial function now appears on the LCD instead of Dial
Standby.

F3

Call Setup:
Return_to_Dial

F1

F2

F3

If the leased line is found to be unacceptable, select
Return_to_Dial which switches the modem back to dial
network operation (LCD displays Dial Standby). If,
however, the leased line is operating properly, you can
select Disconnect from the Call Setup branch and drop the
dial-line call.

NOTE

When the Model 3820 is
configured for leased-line
operation, this function is not
available and is not displayed on
the LCD.

To access Dial Standby or Return to Dial from the Call
Setup branch, make the following selections:

Call Setup:
Dial Standby

F1

F2

F3

Press the key until Dial Standby or Return to Dial
is displayed. Select the appropriate function.

DIAL BACKUP LINE

DIAL

STANDBY

RETURN

TO DIAL

XX

LEASED-LINE

FAILURE

Figure 5-1. Dial Backup

5-4 September 1998 3810-A2-GB30-30

MODEMMODEM

496-13081-01

Call Setup Branch

Dial Standby
Command Complete

F1

F2

F3

If the modem is operating in a Dial Backup mode, the

Dial Standby function forces the modem to leased lines
and displays the status message Command Complete.

Once the modem is in Dial Standby mode, the Return
to Dial function appears on the LCD. Selecting this
function forces the modem to dial networks and displays
the status message Command Complete.

AT Command Equivalent

There is no AT Command equivalent for Dial Standby
or Return to Dial.

Change Directory

Change Directory allows you to enter or modify
telephone numbers. The modem has nonvolatile memory
locations that allow you to store up to 10 telephone
numbers. Each directory location can accept up to
40 characters; this includes the telephone number and
dial command modifiers. Any telephone number dialed
using the DCP Dial command must appear in a directory
location.

Press the key until Change_Directory is displayed.

Press any function key to select Change_Directory.

01 : 5551234 ←
Nxt "#

F1

F2

F3

The phone number listed in directory location 1 is

displayed. Select Nxt to display other directory locations.

Entering Telephone Numbers and Dial
Command Modifiers into Directory Locations

The following example uses an empty directory
location for describing how to enter a telephone number.
If you want to change an existing telephone number in
any of the ten directory locations, follow the same
procedures.

T o add a telephone number to a directory location,
make the following selections:

02 : z
NxtąąąĄ"#

F1

F2

F3

NOTE

If the modem is operating on
leased lines and has a dial line
attached for dial backup
purposes, it is required that
directory location 1 contain the
telephone number used for dial
backup.

T o access Change Directory from the Call Setup

branch, make the following selections:

Call Setup: >
Change_Directory

F1

F2

F3

Select Nxt until a blank directory appears on the LCD.
(The cursor ( { ) always appears in the first character
position.)

Select F2 (") or F3 (#) until the desired character is
selected. This can be an alpha or numeric character.

02 : 9 z
NxtąąąĄ"#

F1

F2

F3

Press the key to move the cursor to the next
character position.

Continue this key sequence until the dial command
modifiers and telephone number are entered. (Refer to
T able 5-1 for a list of valid dial command modifiers.)

5-53810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

01 : 9W5556789 z
NxtąąąĄ"#

AT Command Equivalent

The AT command for Change Directory is & Zn=x,
where n is the directory location and x is the telephone

F1

F2

F3

number.

T able 5-1 describes what can be entered in directory
locations.

T o save the number just entered, scroll to the next
directory location by selecting Nxt or press the " or # key .
The number is now stored in nonvolatile memory.

Table 5-1

Valid Dial Command Modifiers

Dial Command modifiers are parameters entered in the dial command string which specify how, when, and what number
to dial. The following is a list of parameters the 3800 Series Modems recognize:

T – Tone (DTMF) dial. Any digit 0–9, *, #, A, B, C, or D can be dialed as tone.
P – Pulse dial. Only the digits 0–9 can be dialed in Pulse Dial mode.
Once a dialing method (tone or pulse) has been specified, it will only remain active until the end of that dial

string. The modem defaults to the value set by the Dialer T ype configuration option.
, – Pause. Causes the modem to pause before processing the next character in the dial string. The length of this pause

is determined by the setting of the Pause Time configuration option (see Line Dialer configuration option group) or
by value held in S-register S8.

W or + – Wait for dial tone. Modem waits for a second dial tone before processing the dial string. This can be the initial

dial tone or can be used when dialing through a tandem PBX. For example, 9W 555-6789.

R – Reverse Dial mode. Causes the originating modem to send out an answertone once it no longer detects ringback.

(Ringback is the ring you hear at the originating site when making a call.) The R parameter must be the last
character in the dial string.

@ – Quiet answer. Wait for five seconds of silence after dialing the number. If the silence is not detected, the modem

sends the NO ANSWER result code to the DTE or displays the No Quiet Answer LCD status message.

! – Hook flash. This causes the modem to go on-hook for 0.5 seconds then return to off-hook.
; – Return to Command mode. Modem returns to Command mode after dialing a number without disconnecting the call.

This permits you to enter long international telephone numbers, or additional information such as a calling card

number, that would exceed the 40-character limit.
Space, –, and ( ). These characters are ignored by the dial string and can be included to enhance readability.
z End of Number. Hides all characters appearing on the LCD entered to the right of this indicator .

5-6 September 1998 3810-A2-GB30-30

Talk/Data Branch

Overview 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Talk/Data Branch 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Manual Dialing when the Remote Modem Is Configured for Auto-Answer 6-2. . . . . . . . . . . . . . . . . . .

Manual Dialing when the Remote Modem Is Configured for Manual Answer 6-2. . . . . . . . . . . . . . . . .

Placing Modems into Talk Mode Once Modems Are Online 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

Overview

The Talk/Data branch of the Top-Level menu allows
you to switch the modem between T alk mode and Data
mode when manually dialing using either the DCP or
attached telephone. On initial power-up, the modem is in
T alk mode. When in Talk mode, the modem is
disconnected and you are free to use the telephone. When
in Data mode, the modem is connected and data can be
transmitted or received. This function is only available

for Model 3810 and Model 3820 modems.

Call_Setup Security

Status Test Configure Control Remote

Tlk/Data

Talk/Data Branch

The following sections describe three uses of the

T alk/Data function.

“Status”

494-13085-02

6-13810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Manual Dialing when the Remote Modem Is Configured for Auto-Answer

If you are originating a call using a telephone and the
remote modem is configured for Auto-Answer, perform
the following procedure.

Idle : 19.2
Tlk/Data Status

F1

F2

Press the key until Tlk/Data is displayed.

Lift the attached handset and dial the telephone number
of the remote modem. When the remote modem answers,
it transmits an answer tone.

Idle : 19.2
Tlk/Data Status

F1

F2

F3

F3

If the handshake is successful, the modems are in Data

mode and OnLine appears on the LCD.

NOTE

If the remote modem is not a
3800 Series modem, then the
remote user must consult that
modem’s operator’s manual to
perform a similar operation.

Once the modems are online, status messages listed in

T able 4-4 in Chapter 4 appear on the Top-Level display.

It is not necessary to specify an originating or
answering modem when dialing via the DCP because the
answering modem remembers that it received a ring
voltage and will automatically default to Answer mode.

Placing Modems into Talk Mode Once Modems Are Online

If you want to communicate to a remote user via the
telephone once a dial connection has been established,
perform the following procedure.

When you hear this tone, immediately select Tlk/Data.
This starts the handshaking sequence between your
modem and the remote modem.

Online : 19.2 >
Call_Setup

F1

F2

F3

If this is successful, the modems are in Data mode and
Online appears on the LCD.

Manual Dialing when the Remote Modem Is Configured for Manual Answer

If you are originating a call using a telephone and the
remote modem is configured for Manual Answer, perform
the following procedure.

Once the remote telephone is answered by the remote
user, you must both decide when to place the modems into
Data mode. You must both select Tlk/Data at
approximately the same time to begin the handshaking
sequence.

Via your asynchronous DTE, inform the remote user
that you wish to talk and will be placing the modems into
T alk mode. Both users should perform the following.

1. Lift the handset.

2. Press the

key until Tlk/Data is displayed.

3. Select Tlk/Data.
The telephones are now connected and you are

able to talk to the remote user. When you finish
your conversation, and return to Data mode, both
of you must select Tlk/Data.

4. Place the handset on to the cradle.

6-2 September 1998 3810-A2-GB30-30

Overview 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Status Branch 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VF 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Identity 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DTE 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RS366A 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Record 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview

The Status branch of the T op-Level menu allows you
to view the current status of the dial or leased-line
connection, the DTE interface, and the identity (for
example, serial number and model number) of your
equipment. There are up to six selections under Status:
VF, Identity, DTE, RS366A, Options, and Record.

Status Branch

“Status”

7

Call_Setup Security

Tlk/Data Test Configure Control Remote

Status

VF Identity

SigQual
RcvLev
Sig/Noise
NearEcho
FarEcho
FarEchDel
EchoFreqOff

Ser#
Mod #
FRev
HPt#
FPt#

DTE

LSD
DTR
DSR
Tst
TXD
RXD
RTS
CTS

RS366A Options Record

CRQ
DLO
DPR
PND
DSC
ACR

494-13086-03

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COMSPHERE 3800 Series Modems

Status Branch

To access Status from the Top-Level menu, make the
following selections:

Idle : 19.2
Tlk/Data Status

F1

F2

Press the key until Status appears. Select Status.

VF

VF displays the condition of the dial or leased-line
connection.

T o access VF from the Status branch, make the
following selection:

Status:
VF Identity

F1

Select VF.

Status : VF >
SigQual = Excelent

F1

The modem’s signal quality is displayed on the LCD’s
bottom line. Press the
receive signal level, signal-to-noise ratio, near end echo,
far end echo delay, and echo frequency offset.

F2

F2

key to scroll and view the

F3

F3

F3

SigQual Signal Quality indicates the

condition of the VF line.
Possible values are Excelent
(Excellent), Good, Fair, Poor, or
No Signal. These values only
appear for V.32bis and
V.32 modulations.

RevLev Receive Signal Level indicates,

in decibels referenced to one
milliwatt (dBm), the actual
strength of the incoming signal.

Sig/Noise Signal-to-Noise Ratio indicates,

in decibels, the receive signal
strength relative to noise on the
line.

NearEcho Near End Echo displays the

signal level, in decibels
referenced to one milliwatt
(dBm), of that portion of the
transmit signal which has been
echoed back by the local line
termination. This value only
appears for V.32bis and
V.32 modulations.

FarEcho Far End Echo displays the

signal level, in decibels
referenced to one milliwatt
(dBm), of that portion of the
transmit signal which has been
echoed back by the remote line
termination. This value only
appears for V.32bis and
V.32 modulations.

FarEchDel Far End Echo Delay indicates

the roundtrip delay in
milliseconds of the far end echo.

EchoFreqOff Echo Frequency Offset indicates

the frequency offset of the far
end echo.

T o exit VF and remain in the Status Branch, press the
key. To exit and return to the Top-Level menu, press

key.

the

AT Command Equivalent

There is no AT command equivalent for VF status.

7-2 September 1998 3810-A2-GB30-30

Status Branch

Identity

Identity displays the modem’s serial number, model
number, firmware revision level, hardware part number
and firmware part number. Retrieval of this information is
useful if you are purchasing additional or replacement
modems and/or making firmware upgrades.

T o access Identity from the Status branch, make the
following selection:

Status:
VF Identity

F1

F2

Select Identity.

Status : Identity >
Ser # = 00000000

F1

F2

The modem’s serial number is displayed on the LCD’s
bottom line. Press the key to scroll and view the
model number, firmware revision level, hardware part
number, and firmware part number.

Ser # Serial number is an 8-digit

number that identifies the
modem.

Mod # Model number is an

alphanumeric number that
identifies the modem as either a
Model 3810, Model 3811, or
Model 3820 modem.

FRev Firmware revision level is an

alphanumeric number that
identifies the level of firmware
loaded in the modem.

HPt # Hardware part number is an

11-digit number that identifies
the circuit card in the modem.

FPt # Firmware part number is an

11-digit number that identifies
to service personnel the
firmware release number.

F3

F3

To exit this function and remain in the Status branch,

press the
menu, press the

key. To exit and return to the Top-Level

key.

AT Command Equivalent

The AT command I0 displays the product code,

normally 144.

The AT command I1 displays a firmware revision

number.

The AT command I2 performs an EPROM check and

displays OK or Error.

The AT command I3 displays the modem’s serial

number.

The AT command I4 displays the modem’s model

number.

The AT command I5 displays the part number of the

circuit card.

The AT command I6 displays the firmware release

number.

The AT command I9 displays the firmware revision

number (same as I1).

The AT command I10 alters the value of the product
code displayed with the I0 command. See Chapter 14 for
more information.

The AT command I11 performs a checksum of the
modem’s firmware and displays the results in
hexadecimal. (There is no DCP equivalent of this
command.)

The AT command I17 displays the last sequence fault
record.

The AT command I19 displays the firmware revision
level.

7-33810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

DTE

DTE displays the state and/or activity of the
EIA-232-D interface leads: LSD, DTR, DSR, T st, TXD,
RXD, R TS, and CTS signals are monitored. The interface
leads status is updated every 5 seconds.

T o access DTE from the Status branch, make the
following selections:

Status:
Identity DTE

F1

F2

Press the key until DTE appears. Select DTE.

LSD DTR DSR Tst >
_*_

F1

F2

F3

F3

RS366A

RS366A displays the state and/or activity of the
RS366A interface leads: CRQ, DLO, DPR, PND, DSC,
and ACR. T ypically, RS366A call originate is used in
synchronous dial out applications where V.25bis dialing is
not supported. This function applies to Model 3811
modems only . The interface leads status is updated every
5 seconds.

T o access RS366A from the Status branch, make the
following selections:

Status:

DTE RS366A

F1

F2

Press the key until RS366A appears. Select RS366A.

CRQ DLO DPR PND
* _ * * * _

F3

The activity and state of the modem’s DTE signal

appear on the LCD’s bottom line. Press the

key to

scroll other signals into view.

The LCD’s bottom line displays a pair of symbols for
each interface lead. The first symbol indicates the signal’s
activity during the sampling interval. (An * (asterisk)
indicates at least one transition while a blank space
indicates no transitions since the last update.)

The second symbol indicates the state of the interface
lead at the sampling time. (A

block) indicates a Space or
ON condition while an underscore (_) indicates a Mark or
Off condition.)

To exit this function and remain in the Status branch,

press the
menu, press the

key. To exit and return to the Top-Level

key.

AT Command Equivalent

There is no AT command for DTE status.

F1

F2

F3

The activity and state of the modem’s DTE signal

appear on the LCD’s bottom line. Press the

key to

scroll other signals into view.

The LCD’s bottom line displays a pair of symbols for
each interface lead. The first symbol indicates the signal’s
activity during the sampling interval. (An * (asterisk)
indicates at least one transition while a blank space
indicates no transitions since the last update.)

The second symbol indicates the state of the interface
lead at the sampling time. (A

block) indicates a Space or
ON condition while an underscore (_) indicates a Mark or
Off condition.)

To exit this function and remain in the Status branch,

press the
menu, press the

key. To exit and return to the Top-Level

key.

AT Command Equivalent

There is no AT command for RS366A status.

7-4 September 1998 3810-A2-GB30-30

Status Branch

Options

The Options Status function displays all optional
firmware features currently installed in the modem (for
example, V.29, V.33, and dial network management). If no
firmware options are installed, None_Installed appears on
the LCD.

T o access Options from the Status branch, make the
following sections:

Status:
RS366A Options

F1

F2

Press the key until Options appears. Select
Options.

Options’ Status >
V.29 V.33

F1

F2

F3

F3

T o access Record from the Status branch, make the

following selections:

Status <
Options Record

F1

F2

F3

Press the key until Record appears. Select Record.

Record Status
Display Clear

F1

F2

F3

T o display sequence faults, select Display.

Record Number 1
Modem O.K.

F1

F2

F3

If optional features are installed in the modem, they
appear on the LCD’s bottom line. If other features are
installed, press the

key to scroll other features into

view.

Record

Record is a troubleshooting tool used by the end user in
conjunction with support personnel. This function allows
the end user to retrieve and report any sequence faults to
support personnel. A sequence fault is an irregular or
unexpected event.

There are two selections under Record: Display and
Clear. Display allows up to eight sequence fault messages
that have been recorded by the modem to be displayed on
the LCD. If no sequence faults have occurred, then
Modem O.K. appears.

Clear is used to remove all sequence fault messages
from nonvolatile memory and the LCD.

The LCD displays the first sequence fault field.
(Sequence fault fields range from 1 to 8 and are identified
by a number in the upper right corner.) Press the

key

to view the remaining fields. The message Modem O.K.
appears if no sequence faults have occurred.

T o remove sequence fault records from both the LCD
and nonvolatile memory, select Clear. The message
Modem O.K. appears.

To exit this function and remain in the Status branch,
press the

menu, press the

key. To exit and return to the Top-Level

key.

AT Command Equivalent

The AT command I17 displays the last sequence fault
record.

7-53810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

7-6 September 1998 3810-A2-GB30-30

Test Branch

Overview 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Test Branch 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Abort 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Self 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Loc Analog Loop 8-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rem Digital Loop 8-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Loc Digital Loop 8-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pattern 8-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

Overview

The T est branch of the Top-Level menu allows you to
initiate various modem tests. Use these tests if you are
having data communication problems, such as periodic
character loss, random errors, or constant format errors.
By the process of elimination, you can usually isolate the
fault in your system.

Call_Setup Security

Tlk/Data Status Configure Control Remote

Test

There are six selections under T est: Abort, Self
(Self-Test), Loc Analog Loop (Local Analog Loopback),
Rem Digital Loop (Remote Digital Loopback), Loc
Digital Loop (Local Digital Loopback), and Pattern. The
only tests that can operate concurrently are Pattern with a
Local Analog Loopback and Pattern with a Remote
Digital Loopback. If any test is operating, besides the two
combinations just mentioned, it must be canceled before
starting another test.

The Test branch only initiates and cancels tests. If any
parameters need to be set, refer to the Tests section
discussed in Chapter 9, Configure Branch.

“Status”

494-13087-02

Abort Self Loc_Analog_Loop Rem_Digital_Loop Loc_Digital_Loop Pattern

8-13810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Test Branch

T o access the Test branch from the Top-Level menu,

make the following selections:

Idle : 19.2
Status Test

F1

F2

Press the key until Test appears. Select Test.

Abort

Abort ends any test that is in progress and brings the

modem back to the normal mode of operation.
Confirmation is provided by the Command Complete
message.

Test : >
Abort Self

F1

F2

F3

F3

Self

Self performs an internal self-test of the modem, which
takes less than a minute to complete. The modem must be
offline (not connected with another modem), otherwise
Invalid Command appears. This test is not valid in
Remote mode and does not appear on the LCD of either
modem when in Remote mode.

To access Self from the Test branch, make the
following selection:

Test : >
Abort Self

F1

F2

Select Self. (All LCD cells and DCP status indicators
light.)

If the modem passes self-test, Pass appears on the
LCD. If it fails, Failed appears. If the modem fails,
contact your service representative.

If Invalid Command appears on the LCD, then
another test is in progress or the modem is operating on
dial lines. Select Abort to clear the current test, or
disconnect to clear the dial lines, and then choose Self.

F3

Select Abort.

Test : Abort
Command Complete

F1

F2

F3

The modem stops all tests currently in progress and

displays the Command Complete status message on the
LCD. T o exit this function and remain in the Test branch,
press the

menu, press the

key. To exit and return to the Top-Level

key.

AT Command Equivalent

The AT command is &T0.

If the modem receives a ring signal during this test, the
test is cancelled and the RI Abort message appears.

To exit this function and remain in the Test branch,
press the

menu, press the

key. To exit and return to the Top-Level

key.

AT Command Equivalent

The AT command is &T9.

8-2 September 1998 3810-A2-GB30-30

Test Branch

Loc Analog Loop

Loc Analog Loop performs a local analog loopback
(ITU-T V.54 Loop 3), Figure 8-1, that verifies modem
operation as well as the connection between the DTE and
modem. The modem must be offline to perform this test,
otherwise Invalid Command appears.

To access Loc Analog Loop from the Test branch,
make the following selections:

Test :
Loc_Analog_Loop

F1

F2

Press the key until Loc Analog Loop appears.
Press any function key to start this test.

Test : Local Loop
Started

F3

The message Started appears on the LCD, and the Test

LED (Model 3810 and Model 3811) lights for the duration
of the test.

If the Test Timeout configuration option is enabled,

Test Timeout appears at the conclusion of the test. If it is
disabled, the test operates until aborted. For more
information on the T est Timeout configuration option,
refer to the Tests section in Chapter 9.

A Ring Indicate during this test can cause errors.
To exit this function and remain in the Test branch,

press the
menu, press the

key. To exit and return to the Top-Level

key.

AT Command Equivalent

The AT command for Local Analog Loopback is &T1.

F1

F2

F3

Figure 8-1. Local Analog Loopback

8-33810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Rem Digital Loop

Rem Digital Loop performs a remote digital loopback
(ITU-T V.54 Loop 2), Figure 8-2. This test can verify the
integrity of the local modem, the communications link,
and the remote modem. Any data or pattern entered at the
local DTE is sent to and returned from the remote modem.
For this test to operate properly, the modems must be
online and in Synchronous or Asynchronous Direct mode.

To access Rem Digital Loop from the Test branch,
make the following selections:

Test :
Rem_Digital_Loop

F1

F2

Press the key until Rem_Digital_Loop appears.
Press any function key to start this test.

F3

Test : Remote Loop
Started

F1

F2

F3

The message Started appears on the LCD, and the Test

LED (Model 3810 and Model 3811) lights for the duration
of the test.

If the Test Timeout configuration option is enabled,

Test Timeout appears at the conclusion of the test. If it is
disabled, the test operates until aborted. For more
information on the T est Timeout configuration option,
refer to the Tests section in Chapter 9.

To exit this function and remain in the Test branch,

press the
menu, press the

key. To exit and return to the Top-Level

key.

AT Command Equivalent

The AT command for Remote Loopback is &T6.

Figure 8-2. Remote Digital Loopback

8-4 September 1998 3810-A2-GB30-30

Test Branch

Loc Digital Loop

Loc Digital Loop is issued by a local modem and
forces it to loopback any data received from the remote
modem (Figure 8-3). (This test operates the same as a
ITU-T V.54 Loop 2 except it is issued at your modem.)
This is useful if a remote modem is incapable of initiating
a remote digital loopback from its location. For this test to
operate properly, the modems must be online and in
Synchronous or Asynchronous Direct mode.

To access Loc Digital Loop from the Test branch, make
the following selections:

Test :
Loc_Digital_Loop

F1

F2

Press the key until Loc_Digital_Loop appears.
Press any function key to start this test.

F3

The message Started appears on the LCD and the Test

LED (Model 3810 and Model 3811) lights.

If the message Invalid Command appears on the

LCD, then another test is in progress. Select Abort to clear
the current test and then select Loc Digital Loop.

If the Test Timeout configuration option is enabled,
T est Timeout appears at the conclusion of the LCD. If it is
disabled, the test operates until aborted. For more
information on the T est Timeout configuration option,
refer to the Tests section in Chapter 9.

To exit this function and remain in the Test branch,
press the

key. To exit and return to the Top-Level

menu, press the key.

AT Command Equivalent

The AT command for Local Digital Loopback is &T3.

Test : Digitl Loop
Started

F1

F2

F3

Figure 8-3. Local Digital Loopback

8-53810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Pattern

Pattern can transmit and receive a 511 bit error rate test
pattern. It can also be used with a local analog loopback
or a remote digital loopback to simulate data passing

Figure 8-4. Pattern Test and Local Analog Loopback Test

through the modem. For this test to operate properly, the
modems must be online and in Synchronous or
Asynchronous Direct mode. Otherwise, the message
Invalid:Bffr Mde appears when this test is started. (See
Figures 8-4 through 8-6.)

Figure 8-5. Pattern Test and Remote Digital Loopback Test

8-6 September 1998 3810-A2-GB30-30

Figure 8-6. End-to-End Pattern Test

Test Branch

To access Pattern from the Test branch, make the
following selections:

Test : >
Pattern

F1

F2

F3

Press the key until Pattern appears. Select Pattern
to start this test.

Test : Pattern >
Blks Errd = xxxxxxx

F1

F2

F3

BlksErrd=xxxxxxx displays the number of blocks of
data found in error (block size is 1000 bits per block). The
message NoSync can appear as a value for BlksErrd while
the modem’s receiver is synchronizing. The message
OvrFlw can appear as the value for BlksErrd if the
counter overflows.

The Pattern test can be exited and reentered without
restarting the test. The BlksErrd and BlksRcvd continue
counting.

If the Test Timeout configuration option is enabled,
Test Timeout appears at the conclusion of the test. If it is
disabled, the test operates until aborted. For more
information on the T est Timeout configuration option,
refer to the Tests section of Chapter 9.

To exit this function and remain in the Test branch,
press the

menu, press the

key. To exit and return to the Top-Level

key.

AT Command Equivalent

The AT command for Pattern is &T2.

Press the

key to display BlksRcvd=xxxxxxx,

number of blocks of data received.

8-73810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

8-8 September 1998 3810-A2-GB30-30

Configure Branch

Overview 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configure Branch 9-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Editing and Saving a Configuration Option 9-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Summary 9-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuration Tables 9-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DTE Interface 9-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DTE Dialer 9-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Line Dialer 9-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dial Line 9-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Leased Line 9-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

V.42/MNP/Buffer 9-33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tests 9-39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Misc 9-41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Security Configuration Options 9-45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

Overview

After installing a 3800 Series modem, its software
configuration options must be set using either the
Diagnostic Control Panel (DCP) or the AT command set.
This chapter describes how to access and use the
Configure branch of the T op-Level menu via the DCP.

The Configure branch accesses the Edit Area which is
a work space where you view and change any
configuration options (straps). These configuration
options are loaded to the Edit Area from one of five
configuration option areas: Active (Operating),
Active (Saved), Customer 1, Customer 2, or Factory.

• Active (Operating) is a configuration area

containing configuration options currently used by
the modem. When the modem is powered on or
when a save is performed, the contents of Active
(Saved) are loaded into Active (Operating). Any
changes made using AT commands directly affect
this configuration area.

• Active (Saved) is a read from and write to

configuration option area containing the most
recently saved changes made to any configuration
options. In the event of power loss or reset, the
modem retrieves these settings from nonvolatile
memory.

• Customer 1 and Customer 2 are two additional

read and write (changeable) configuration areas
where you can create and store additional
configurations for specific applications.

• Factory is a read-only (unchangeable)

configuration area containing six sets of predefined
configuration options labeled Async Dial, Sync
Dial, Sync Leased (Answer/Originate), UNIX
Dial, Cellular (Mobile), and Cellular (PSTN).
These sets contain the most commonly used
configuration options for modems installed in these
hardware environments, and give you a head start
in configuring your modem. Factory default
settings are listed in Appendix G.

The Cellular (Mobile) and Cellular (PSTN) options
are available only if Enhanced Throughput Cellular
(ETC) is installed.

NOTE

If you are using AT commands,
a period of time can exist in
which the contents of Active
(Operating) and Active (Saved)
differ. Once you issue an
AT&W0 (write) command,
however, the two storage areas
are identical.

9-13810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Figures 9-1 and 9-2 graphically display the interaction
between the edit area and configuration areas as viewed
from the perspective of the DCP and the AT command set.

CONTENTS OF Active (Saved) ARE AUTOMATICALLY COPIED TO
Active (Operating) WHEN A SAVE IS COMMANDED VIA THE DCP,
ON A RESET, OR ON POWER-UP

Active (Operating) Active (Saved) Customer 1 Customer 2 Factory

Load Edit

Area From

• Async Dial

• Sync Dial

• Sync Leased

(Answer/Originate)

• UNIX Dial

• Cellular (Mobile)

• Cellular (PSTN)

EDIT AREA

ALLOWS YOU TO VIEW AND EDIT
CONFIGURATION OPTIONS

Save

To

ANY CHANGES MADE TO
CONFIGURATION OPTIONS
ARE SAVED TO Active (Saved),
Customer 1, OR Customer 2

Figure 9-1. DCP Configuration Process

494-13079-02

9-2 September 1998 3810-A2-GB30-30

Configure Branch

Active (Saved)

(ATZ0, ATZ3)

NOTE

ON POWER-UP, Active
(Saved) IS LOADED TO
Active (Operating)

Active (Operating)

CHANGES MADE USING ANY AT
COMMAND IMMEDIATELY AFFECT
MODEM OPERATION

USE AT&W COMMAND TO SAVE
CHANGES TO Active (Saved),
Customer 1, OR Customer 2

Customer 1

(ATZ1)

LOAD Active (Operating)

USING ATZ OR AT&F

COMMAND

Customer 2

(ATZ2)

Factory

• Async Dial
(AT&F0)

• Sync Dial
(AT&F1)

• Sync
Leased
Answer
(AT&F2)

• UNIX Dial
(AT&F3)

• Sync Leased
Originate
(AT&F4)

• Cellular
(Mobile) (AT&F5)

• Cellular
(PSTN) (AT&F6)

THE AT&W COMMAND IS
DISABLED IF THE Straps
When Disconnect
CONFIGURATION OPTION
IS SET TO RELOAD

Active (Saved)

(AT&W0)

Customer 1

(AT&W1)

Customer 2

(AT&W2)

Figure 9-2. AT Command Configuration Process

NOTE

494-13080-02

9-33810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Configure Branch

The Configure branch of the T op-Level menu contains
all of the modem’s configuration options (straps) which
determine how the modem operates. These configuration
options are accessed by scrolling down and across various
levels of the Configure branch.

“Status”

Call_Setup Security

Tlk/Data Status Test Control Remote

Configure

Ld EditArea frm:

Activ (Operating)

Active (Saved)

Customer1 Customer2 Factory

Async_Dial

Sync_Dial

Choose Function

Edit Save

Active (Saved) Customer1 Customer2

Sync_Leased

UNIX_Dial

Choose Mode

Answer Originate

Cellular
(Mobile)

Cellular
(PSTN)

DTE_Interface

DTE_Dialer

Line_Dialer

Dial_Line

Leased_Line

V42/MNP/Buffer

Tests

Misc

Security

494-13088-02

9-4 September 1998 3810-A2-GB30-30

Configure Branch

The Configure branch consists of the following three
levels:

• Ld EditArea frm. Allows the selection of the

Active (Operating), Active (Saved), Customer 1,
Customer 2, and Factory configuration areas.

• Choose Function. Allows you to make changes

(Edit) to existing configuration options or write
(Save) these changes to either the Active (Saved),
Customer 1, or Customer 2 configuration area.

• Edit Strap Group. Contains the eight software

configuration option groups that determine how the
modem operates.

Editing and Saving a Configuration Option

The following example shows how to change the
Remote Access Password using the DCP. (If you ever
intend to access another 3800 Series modem via the
Remote branch of the T op-Level menu, the Remote
Access Password must be the same for both modems.) By
following these procedures you learn how to load a
factory preset configuration area (in this case, Async
Dial), how to edit a configuration option (Remote Access
Password), and how to save changes to a configuration
area (Active (Saved)). The shaded key indicates what key
to press.

Select the Factory configuration area.

Ld Fact Preset : >
Async_Dial

F1

F2

F3

Select Async_Dial.

Choose Function
Edit Save

F1

F2

F3

Select Edit.

Edit StrapGroup >
DTE_Interface

F1

F2

F3

Idle : 19.2
Test Configure

F1

F2

F3

Select Configure from the Top-Level menu.

LdEdit Areafrm >
Activ (Operating)

F1

F2

F3

LdEdit Areafrm <
Activ (Operating)

F1

F2

F3

Edit StrapGroup <
Tests Misc

F1

F2

F3

Scroll across the LCD and select the Misc

configuration options group.

StrapsWhenDisc >
Nxt No_Change

F1

F2

F3

RemAccssPasswrd
NxtąĄ°0

F1

0000000

F2

F3

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COMSPHERE 3800 Series Modems

Select Nxt until RemAccssPasswrd appears.

RemAccssPasswrd
NxtąĄ°0

F1

0000000

F2

F3

Select the F2 (°) key to increment password values.

RemAccssPasswrd
NxtąĄ°0

F1

0000000

F2

F3

Press the key to move the cursor to the next
position.

RemAccssPasswrd
NxtąĄ°12345678

F1

F2

F3

Continue this sequence until you have entered the new
password value.

T o save the new password to a configuration area,
make the following selections.

Sav EditArea to >
Active (Saved)

F1

F2

F3

Select a configuration area (Active (Saved),

Customer 1, or Customer 2) to save the changes.

Select the key to exit to the Top-Level menu or

select the

key to remain in the Configure branch.

Summary

When using the DCP to edit configuration options,

keep the following in mind:

• Nxt has two functions. First, it indicates that more

configuration options are available within that
group. These are accessed by selecting Nxt
(pressing F1) and scrolling down to the next
configuration option. Second, it indicates that what
is displayed on the LCD is the current setting. If
you scroll left or right, Nxt disappears and
reappears if a new value is selected.

• End appears when you have scrolled down to the

last configuration option available in that group.
Selecting End returns you to the top of the
configuration group. You are free to enter that
group again or scroll left or right to the next
configuration options group.

• The

branch each time it is pressed.

key takes you one step up in the Configure

RemAccssPasswrd
NxtąĄ°12345678

F1

F2

F3

• The key causes you to exit the Configure

branch and return to the T op-Level menu. If any
changes are made to configuration options, the DCP
allows you to save these changes to either the
Active (Saved), Customer 1, or Customer 2
configuration areas.

Press the key to scroll up (twice).

• The

LCD.

and keys move selections across the

• The function keys (F1, F2, F3) select the LCD

Choose Function

choice that appears above that function key.

Edit Save

F1

F2

F3

Select Save.

9-6 September 1998 3810-A2-GB30-30

Configure Branch

Configuration Tables

The modem’s configuration options are arranged
into eight groups based upon functionality: DTE
Interface (T able 9-1), DTE Dialer (Table 9-2),
Line Dialer (T able 9-3), Dial Line (Table 9-4),
Leased Line (T able 9-5), V.42/MNP/Buffer (Table 9-6),
T ests (Table 9-7), and Misc (Table 9-8).

Throughout these tables, two selections frequently
appear on the LCD: Enable and Disable. Unless otherwise
stated, Enable selects a configuration option and makes it
available for use; Disable makes a configuration option
unavailable for use.

The remainder of this chapter discusses each
configuration options group in detail, listing factory
defaults, definitions, and AT command equivalents.

DTE Interface

The DTE Interface configuration options contain
EIA-232-D (ITU-T V.24) and asynchronous character
format information essential for maintaining a connection
and for transmitting data between the DTE and the
modem.

T able 9-1 shows each DTE Interface configuration
option as it appears on the LCD, with the Async Dial
factory default setting (the default value if the modem is
just being installed) shown following the colon (:) on the
first line and with all available selections listed on the
second line. Following this is a description of the
configuration option, a description of the available
selections, and any equivalent AT commands.

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COMSPHERE 3800 Series Modems

Table 9-1

(1 of 7)

DTE Interface Configuration Options

Async/Sync Mode: Async
Nxt Async Sync

Asynchronous/Synchronous Mode. Determines whether the modem operates in Asynchronous mode or Synchronous
mode. If the A T command set is enabled and this configuration option is set for Sync, then the modem operates in Async
mode when offline.

For Async Dial and UNIX Dial, Async is the factory default. For Sync Dial and Sync Leased, Sync is the factory default.
A T commands for Async Mode are &M0, &M231, &M232, &M235, or &Q0.
A T commands for Sync Mode are &M1, &M2, &M3, &M233, &M234, &M236 or &Q1, &Q2, &Q3.

*Async DTE Rate: 19200

Nxt 19200 57600 38400 14400 12000 9600 7200 4800 2400 1200 0–300 76800 115200

Asynchronous DTE Data Rate. Identifies the asynchronous DTE’s operating rate to the modem. Data rates from
1 15,200 bps to 300 bps are supported.

To originate calls in 76,800 bps Sun Workstationr environments, use either DCP dialing, DTR dialing, or handset dialing.
The modem does not support A T command dialing at this data rate.

To prevent losing data in 115,200 bps applications, a 16650 UART on the PC’s serial port is required, as well as a
communications package which can take advantage of its 16-byte buffer. In addition, a 386 25-MHz (or faster) PC is
required, and the RS-232 cable must be 6 feet or less to minimize capacitance.

NOTE: This configuration option is ignored in Async Direct mode and synchronous mode since the DTE rate always

The factory default is 19200 bps.
AT prefix determines Async DTE Rate.

equals the VF rate.

#Data Bits: 8
Nxt 8 7 9(DirectMde) 6(DirectMde)

Number of Data Bits. Determines if the data length is composed of 6, 7, 8, or 9 data bits. This data length excludes start,
parity , and stop bits.

8 – Sets data length to 8 data bits. This is the default for Async mode.
7 – Sets data length to 7 data bits. This is the default for Sync mode.
9(DirectMode) – Sets data length to 9 data bits. Only valid when Error Control configuration option is set to Direct Mode.
6(DirectMode) – Sets data length to 6 data bits. Only valid when Error Control configuration option is set to Direct Mode.

The factory default is 8 data bits.
NOTE: If the DTE Dialer Type configuration option is set for A T or V.25bis Async, then the total character size must

equal 10 bits (see DTE Dialer configuration options group). Total character size consists of a start bit, number of
data bits, parity bits, and stop bits. V.25bis Async must use 7 data bits with even parity and 1 stop bit. The total
character size for Error Control mode or Buffer mode must be 10 bits or less. The total character size for Direct
mode must be 1 1 bits or less.

A T prefix determines the async character length.

* This configuration option only appears if Async/Sync Mode is configured for Async.

9-8 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-1

(2 of 7)

DTE Interface Configuration Options

Parity Bit: None
Nxt None Even Odd Mark Space

Parity Bit. Determines type of parity bit. The parity of the DTE must match the parity of the modem. Parity options include
None, Even, Odd, Mark, or Space.

None – No parity bit is used. This is the default for Async mode.
Even – Parity bit is set so that total number of 1’s in data bits plus parity bit is even.
Odd – Parity bit is set so that total number of 1’s in data bits plus parity bit is odd. This is the default for Sync mode.
Mark – Parity bit is always set to 1. Only valid if #Data Bits configuration option is set to 7.
Space – Parity bit is always set to 0. Only valid if #Data Bits configuration option is set to 7.

The factory default is None.
NOTE: If the DTE Dialer Type configuration option is set for A T or V.25bis Async, then the total character size must

equal 10 bits (see DTE Dialer configuration options group). Total character size consists of a start bit, number of
data bits, parity bits, and stop bits. V.25bis Async must use 7 data bits with even parity and 1 stop bit. The total
character size for Error Control mode or Buffer mode must be 10 bits or less. The total character size for Direct
mode must be 1 1 bits or less.

A T prefix determines parity of the character.

#Stop Bits: 1
Nxt 1 2

Number of Stop Bits. Selects 1 or 2 bits to signal the end of a character.
The factory default is 1.
NOTE: If the DTE Dialer Type configuration option is set for A T or V.25bis Async, then the total character size must

A T prefix determines the number of stop bits via autobauding.

equal 10 bits (see DTE Dialer configuration options group). Total character size consists of a start bit, number
of data bits, parity bits, and stop bits. V.25bis Async must use 7 data bits with even parity and 1 stop bit. The
total character size for Error Control mode or Buffer mode must be 10 bits or less. The total character size for
Direct mode must be 1 1 bits or less.

9-93810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 9-1

(3 of 7)

DTE Interface Configuration Options

DTR Action: Ignore
Nxt Stndrd_RS232 Ignore CntrlsOnHook Off=ReloadStrp Off=CmdMode CntrlsTXMute

Data Terminal Ready Action. DTR is a signal from the DTE to the modem indicating that the DTE is connected and ready
for operation.

Standard RS232 – Allows the DTE to control DTR to the modem as specified in EIA-232-D and ITU-T V.24
specifications. If this signal is not present, the modem will not answer or dial. In leased line mode, using direct mode,
DTR must be on for the modem to transmit or receive data.

Ignore – Modem assumes DTR is always ON. This is used when DTE does not provide DTR to the modem.
CntrlsOnHook – Modem does not disconnect from the VF line during an active call until DTR is lowered by the attached

DTE. This setting is required for applications in which the host processor must reset itself for the next session before the
current session is terminated. The setting is ignored if the modem receives a disconnect command from the DCP or from
the COMSPHERE 6700 Network Management System.

Off=ReloadStrp – Like Standard RS232, except that when DTR is lowered the modem loads the Active (Saved) area
into the Active (Operating) area.

Off=CmdMode – When the modem is online and DTR is Off for longer than the period specified by the S25 register, the
modem enters online Command mode. The A TO command must be issued to return to data mode. This setting has the
same effect as Ignore if AT commands are disabled.

CntrlsTXMute – Like Standard RS232, except that when DTR is lowered at the answering modem, the modem mutes
transmitter output.

NOTE: If V.25bis mode is used, then this configuration option must be set for Stndrd_RS232. The DTE must provide

When operating over the dial network, this selection forces DTR Action to behave as CT108/2 (Data Terminal Ready). If
DTE Dialer Type configuration option is set to DTR=Direct 1, then DTR Action behaves as CT108/1 (Connect Data Set
to Line).

For Async Dial, Sync Leased, and UNIX Dial, Ignore is the factory default.
For Sync Dial, Stndrd_RS232 is the factory default.

A T command for Ignore is &D0.
A T command for Off=CmdMode is &D1.
A T command for Standard RS232 is &D2.
A T command for Off=ReloadStrp is &D3.
AT command for CtrlsOnHook is &D4.
A T command for CntrlsTXMute is &D5.

DTR to dial or answer a call.

DSR Control: Forced_On
Nxt Forced_On Stndrd_RS232 WinkWhenDisc Follows_DTR On_Early Delay_To_Data DialBkToggle

Data Data Set Ready Control. DSR is a signal from the modem to the DTE indicating the modem is connected and ready
for operation.

Forced On – Forces DSR output ON constantly. This is usually used for leased-line applications and when the DTE
requires DSR to always be ON.

Standard RS232 – Allows the modem to control DSR to the DTE. The modem raises DSR when it begins the
handshake process. DSR lowers upon disconnect. The modem may not be ready to receive data until DSR, CTS, and
LSD are active.

An ON state indicates to the DTE that the modem is ready to receive data. An Off state indicates that the modem is not
ready to receive data, and the DTE will not send data to the modem. During a Local Analog Loop and a Remote Digital
Loop, DSR is ON.

Wink When Disconnect – DSR is normally forced ON, but is turned Off for 1 to 2 seconds upon a disconnect.
Follows DTR – When the modem receives DTR from the DTE, it sends DSR to the DTE.
On Early – DSR is low when the modem is in the idle state. DSR goes high immediately upon a command to enter Data

mode. This setting is required for some modem pooling applications.

9-10 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-1

(4 of 7)

DTE Interface Configuration Options

DSR Control (cont’d)
Delay to Data – Operation is similar to the Standard RS232 setting except that DSR does not turn ON until the modem

enters Data mode. Normally , the modem raises DSR when it begins the handshaking process.
Use this setting when the DTE cannot operate with a long DSR-to-CTS delay (common for V.32bis modulation) or when

dial access security is enabled and requires a DTE-side password entry . Often, the DTE cannot accept the long delay
between DSR and CTS turning ON due to the remote user entering the DTE-side password.

Dial Backup T oggle – DSR is turned off during a dial backup attempt in Leased mode, and on when such an attempt
completes. DSR is also turned off when a disconnect begins, and turned on when the disconnect is complete.

For Async Dial and UNIX Dial, Forced_On is the factory default.
For Sync Dial and Sync Leased, Stndrd_RS232 is the factory default.

A T command for Forced On is &S0.
A T command for Standard RS232 is &S1.
A T command for Wink When Disconnect is &S2.
A T command for Follows DTR is &S3.
A T command for On Early is &S4.
A T command for Delay to Data is &S5.
A T command for Dial Backup Toggle is &S6.

RTS Action: Ignore
Nxt Ignore Stndrd_RS232 Sim_Cntl_Car Cntl_Car

Request-to-Send Action. RTS is a signal from the DTE to the modem indicating the DTE has data to send to the modem.

Ignore – Modem assumes RTS is always ON. Use this selection when the DTE does not provide RTS to the modem.
Standard RS232 – Allows the DTE to control RTS to the modem in normal EIA-232-D operation. In direct mode, RTS

must be ON for the DTE to transmit to the modem.
Simulated Control Carrier – RTS input controls the remote modem’s LSD signal. This is used for DTEs that require

Line Signal Detect (LSD) to toggle ON and Off to simulate half-duplex operation.

NOTE: If RTS Action is set for simulated control carrier, then the remote modem’s LSD Control configuration option

Control Carrier – Allows the DTE’s RTS signal to control the modem’s carrier signal. When RTS is ON, carrier is

present on the VF line. When RTS turns Off, carrier is no longer present. This is only valid for V.29 leased-line
modulation, if installed.

For Async Dial and UNIX Dial, Ignore is the factory default.
For Sync Dial and Sync Leased, Stndrd_RS232 is the factory default.

A T command for Standard RS232 is &R0.
A T command for Ignore is &R1.
A T command for Simulated Control Carrier is &R2.
A T command for Control Carrier is &R3.

must be set for Simulated Control Carrier. Simulated Control Carrier conforms to V.13 specifications. This
setting is ignored when the modem is configured for Asynchronous mode and RTS/CTS flow control is
selected.

9-113810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 9-1

(5 of 7)

DTE Interface Configuration Options

CTS Control: Forced_On
Nxt Forced_On Stndrd_RS232 WinkWhenDisc Follows_DTR

Clear-to-Send Control. CTS is a signal from the modem to the DTE indicating that it can accept data from the DTE.

NOTE: When CTS flow control or CTS/RTS flow control is enabled, CTS will turn ON and Off regardless of the setting

Forced On – CTS is forced ON at all times. Use this selection for most asynchronous applications.
Standard RS232 – In Synchronous mode, forces the state of CTS to follow the state of RTS in normal EIA-232-D

operation. The minimum time that elapses between CTS and RTS is determined by the RTS/CTS Delay configuration
option. Use this setting for most synchronous applications.

In A T Command mode, CTS goes low just prior to DSR going active and goes high when the modem enters Data mode.
This operation prevents losing data in applications which begin transmitting as soon as DSR and CTS are both active.

Wink When Disconnect – CTS is normally forced ON, but is turned Off for 1 to 2 seconds upon a disconnect. Use this
for most UNIX applications.

Follows DTR – The state of CTS follows the state of DTR. When DTR turns ON, CTS turns ON. When DTR turns Off,
CTS turns Off.

For Async Dial, Forced On is the factory default.
For Sync Dial and Sync Leased, Stndrd_RS232 is the factory default. For UNIX Dial, WinkWhenDisc is the factory
default.

A T command for Forced On is \D0.
A T command for Standard RS232 is \D1.
A T command for Wink When Disconnect is \D2.
A T command for Follows DTR is \D3.

of CTS Control.

RTS/CTS Delay: 0 msec
Nxt 0msec 10msec 50msec 150msec 600msec

Request-to-Send/Clear-to-Send Delay. RTS/CTS Delay sets the delay time between the modem receiving RTS from the
DTE and the modem sending CTS to the DTE.

This delay is only valid in Async Direct mode and synchronous applications when it is necessary to have a short delay
between the time the DTE raises RTS and the time the modem presents CTS to allow the DTE to send data.

NOTE: For this configuration option to be valid, both the RTS Action and the CTS Control configuration options must be

set for Stndrd RS232. If RTS Action is set for Ignore, RTS is always ON and this configuration option has no
effect.

The factory default is 0 milliseconds.
A T command is S-register S26 = n, where n is a value from 0 to 255 in 10 millisecond increments.

9-12 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-1

(6 of 7)

DTE Interface Configuration Options

LSD Control: Stndrd_RS232
Nxt Stndrd_RS232 Forced_On WinkWhenDisc Follows_DTR Sim_Cntrl_Car =DTR/DiscOff
BridgeRetrain

Line Signal Detect Control. LSD is a signal indicating that the carrier signal is being received from the remote modem. It
is normally turned Off to the DTE when the power level of the received carrier signal drops below the carrier detect
threshold.

Standard RS232 – LSD is ON when the modem detects the remote modem’s carrier signal. LSD turns Off when the
carrier signal strength drops below carrier detect threshold.

Forced On – Forces LSD to be ON at all times.
Wink When Disconnect – LSD is normally forced ON, but can be turned Off for 1 to 2 seconds upon a disconnect. This

is used for UNIX DTEs.
Follows DTR – The state of LSD follows the state of DTR. When DTR turns ON, LSD turns ON. When DTR turns Off,

LSD turns Off.
Simulated Control Carrier – LSD follows the state of RTS of the remote DTE via the V.13 simulated control carrier

signaling. This is required for hosts that cannot support full-duplex operation.

NOTE: If LSD Control is set for simulated control carrier, then the RTS Action configuration option on the remote

=DTR/Disconnect Off – The state of LSD follows the state of DTR except when disconnecting once a connection is

established. In this instance, DTR remains ON and LSD turns Off. DTR must then toggle Off and then ON again for LSD
to turn ON. This setting is required for A T&T DATAKITr dial-out applications.

BridgeRetrain – LSD behaves as if it were set for Standard RS232, except that it is turned off when a retrain condition
lasts longer than10 seconds, and turned on again when no retrain condition is detected for a period of 10 seconds.

NOTE: If LSD Control is set for =DTR/DiscOff, then the DTR Action configuration option must be set for Stndrd_RS232.
For Async Dial, Sync Dial, and Sync Leased, Stndrd_RS232 is the factory default.

For UNIX Dial, WinkWhenDisc is the factory default.
A T command for Forced On is &C0.

A T command for Standard RS232 is &C1.
A T command for Wink When Disconnect is &C2.
AT command for Follows DTR is &C3.
A T command for Simulated Control Carrier is &C4.
AT command for =DTR/Disconnect Off is &C5.
A T command for BridgeRetrain is &C6.

modem must be set for Simulated Control Carrier.

TX Clock Source: Internal
Nxt Internal External RXC_Loop

Transmit Clock Source. Determines the source of timing for synchronous data transmitted from the DTE.
Internal – The transmit data’s clock source is derived from the modem’s internal clock and output on Pin 15 (TXC) of the

EIA-232-D interface.

External – The transmit data’s clock source is provided by the DTE on Pin 24 (EXT) on the EIA-232-D interface.
Receive Clock Loop – The modem’s transmit clock is derived from its received signal and is output on Pin 15 (TXC) of

the EIA-232-D interface.
NOTE: This configuration option only appears if Async/Sync Mode is configured for Sync.
The factory default is Internal.

A T command for Internal is &X0.
A T command for External is &X1.
A T command for RXC Loop is &X2.

9-133810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 9-1

(7 of 7)

DTE Interface Configuration Options

CT111_Rate Cntl: Disable
Nxt Disable Fallback1 Fallback2

CT1 11 Rate Control. Allows the DTE to control modem rate via Pin 23 of the EIA-232-D interface. This option determines
the effect of the DTE Rate control signal. CT111 is also known as CH on the EIA-232-D interface.

Disable – Disregards CT111 Rate Control.
Fallback1 – Forces the modem to decrease its configured data rate to the next lower data rate when CT111 is Off. Valid

only for V.32bis, or , if installed, V.29 and V.33 modulations. Modem will only fall back within the same modulation
scheme. When CT1 11 turns ON, the modem returns to its previous data rate.

Fallback2 – Forces the modem to decrease two data rates while remaining in the same modulation scheme. When
CT1 11 turns ON, the modem returns to its previous data rate.

NOTE: This configuration option is only valid in Async Direct mode and Synchronous mode. For proper operation,

disable the V32bis Autorate and V32bis Automode configuration options.

The factory default is Disable.
A T command is S-register S61 = n, where n is 0 for Disable, 1 for Fallback1, and 2 for Fallback2.

DTE Rate=VF: Disable
End Disable Enable

DTE Rate = VF Rate. Forces the data rate of the connection between the DTE (computer) and the modem to be the
same as the VF (telephone line) rate.

Disable – The DTE rate is the value of the Async DTE Rate configuration option.
Enable – The DTE rate is identical with the VF rate.

The factory default is Disable.
A T command is S-register S90 = n, where n is 0 for Disable, and 1 for Enable.

9-14 September 1998 3810-A2-GB30-30

Configure Branch

DTE Dialer

T able 9-2 shows each DTE Dialer configuration option

as it appears on the LCD, with the Async Dial factory

The DTE Dialer configuration options establish the
DTE-to-modem protocol for call establishment and
control.

default setting (the default value if the modem is just
being installed) shown following the colon (:) on the first
line and with all available selections listed on the second
line. Following this is a description of the configuration
option, a description of the available selections, and any
equivalent AT commands.

Table 9-2

(1 of 5)

DTE Dialer Configuration Options

DTE Dialer Type: A T
Nxt AT Disable V25bis_Async V25bis_Bsync V25bis_HDLC DTR=Dirs RS366A AT&T_Exclusv

Data Terminal Equipment Dialer Type. Identifies to the modem the type of dialing method and protocol used by the DTE.
AT – Allows AT command protocol to be used as a method for entering commands and dialing when used in an

asynchronous application. This is the only valid setting for leased-line applications.

NOTE: The modem will not respond to AT commands if DTE Dialer Type is not set for AT.
Disable – Disables any type of DTE dialing method. Dialing can only be performed using the DCP’s Dial command or

attached telephone.
V.25bis Async – Selects V.25bis Async as the dialing method and protocol used by the modem. The character length

must be 7 data bits with even parity and 1 stop bit.
V.25bis Bisync – Selects V.25bis Bisync as the dialing method and protocol used by the modem. This is also known as

character-oriented protocol. This framing protocol uses two synchronous control characters and a start-of-text control
character before the text block and an end-of-text control character after the text block. The character length must be
7 data bits with odd parity and 1 stop bit.

V.25bis HDLC – Selects V.25bis HDLC as the dialing method and protocol used by the modem. This is also known as
bit-oriented protocol. This framing protocol uses flag, address and control characters before the text block and a frame
sequence check and flag after the text block.

DTR=Dirs – Allows the modem to automatically dial the number stored in directory location 1 whenever DTR turns ON.
NOTE: DTR dialing cannot be used if dial access security is enabled.
RS-366A – Selects EIA RS-366-A as the dialing method and protocol; used (and available) only with Model 3811

modems. RS-366-A is a parallel interface typically used in older IBMr synchronous environments. Refer to Table E-4 in
Appendix E for pinout information.

AT&T Exclusive – Enables a subset of the proprietary A T&T command set, which is required for some applications that
use A T&T equipment. Currently, the only application supported is AT&T DATAKIT.

For Async Dial and UNIX Dial, AT is the factory default.
For Sync Dial and Sync Leased, Disable is the factory default.

A T commands for AT are &M0, &M1, &M3, &Q0, &Q1, and &Q3.
A T commands for Disable are &M231, &M236, &Q231, and &Q236.
A T commands for V.25bis Async are &M232 and &Q232.
A T commands for V.25bis Bisync are &M233 and &Q233.
A T commands for V.25bis HDLC are &M234 and &Q234.
A T commands for DTR=Dirs dialing are &M2 and &Q2.

9-153810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 9-2

(2 of 5)

DTE Dialer Configuration Options

*AT Escape Char: 043 ASCI

Nxt " 043 ASCI

A T Escape Character. The escape sequence (+++) allows you to move back and forth between Command mode and
Data mode. The ASCII value of the escape character (43 ASCII) can be set to any ASCII value from 1 ASCII to 255
ASCII. However, the escape character is disabled if a value greater than 127 ASCII is entered. When disabled, the call
must be disconnected to return to Command mode.

The factory default is 43 (ASCII AT escape character).
A T command is S-register S2 = n, where n is a value from 1 to 127.

A T command to disable is S-register S2 = n where n is a value from 128 to 255. (When disabled, the modem cannot
return to Command mode unless disconnected.)

*Escape GuardTim: 1sec

Nxt 1sec 200msec 400msec 600msec 800msec 2sec

Escape Guard Time. Determines the length of the required pause before and after the escape sequence is issued. The
guard time prevents the modem from interpreting data as the escape sequence characters.

The factory default is 1 second.
A T command is S-register S12 = n, where n is a value from 0 to 255 in 20 millisecond increments.

*BreakForceEscap:

Disable Nxt Disable Enable

Break Forces Escape. Determines whether or not the modem should enter Command mode when it receives a break
character from the DTE.

Disable – A break character is sent to the remote end.
Enable – Modem escapes into AT Command mode, and a break character is not sent to the remote end.

The factory default is Disable.
A T commands to enable are \K0, \K2, or \K4.

A T commands to disable are \K1, \K3, or \K5.

*CommandCharEcho: Enable

Nxt Enable Disable

Command Character Echo. Controls whether or not characters are echoed back to the DTE when the modem is in
Command mode.

The factory default is Enable.
A T command to disable Command Data Echo is E0.

A T command to enable Command Data Echo is E1.

*CarriageRtn Char: 013 ASCI

Nxt ↑ 013 ASCI

Carriage Return Character. Allows you to change the ASCII character used to terminate an AT command to any ASCII
value from 0 to 127.

The factory default is 13 (ASCII carriage return).
A T command for Carriage Return Character is S-register S3 = n, where n is a value from 0 to 127.

* This configuration option only appears if DTE Dialer Type is configured for AT.

9-16 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-2

(3 of 5)

DTE Dialer Configuration Options

*Backspace Char: 008 ASCI

Nxt ↑ 008 ASCI

Backspace Character. Sets the character used to perform a backspace in Command mode.
The factory default is 08 (ASCII backspace character).
A T command is S-register S5 = n, where n is a value from 0 to 127.

*Linefeed Char: 010 ASCI

Nxt ↑ 010 ASCI

Line Feed Character. Sets the character used to perform a line feed in Command mode for responses from the modem.
The factory default is 10 (ASCII line feed character).
A T command for Line Feed Character is S-register S4 = n, where n is a value from 0 to 127.

*Result Codes: Enable

Nxt Enable Disable EnableInOrig

Result Codes. Result codes are informational messages (such as Connect and Ring) sent from the modem and
displayed on the asynchronous DTE terminal. (For a list of result codes, refer to Table B-1 in Appendix B.)

Enable – Modem sends result codes to the DTE.
Disable – Modem does not send result codes to the DTE.
EnableInOrig – For UNIX applications, enable result codes only on the originating modem. This prevents the DTE on

the answer side from interpreting result codes as login attempts.
For Async Dial, Enable is the factory default.

For UNIX Dial, EnableInOrig is the factory default.
A T command to enable is Q0.

A T command to disable is Q1.
A T command to enable in Originate mode is Q2.

*ExtendResltCode: Enable

Nxt Enable Disable Add/EC Add/V42,MNP Use_DTE_Rate

Extended Result Codes. Informational messages such as VF data rate and Error Control are displayed with the result
codes. (For a list of Extended Result Codes, refer to Table B-1 in Appendix B.)

Enable – Result codes include NO DIALTONE, BUSY, NO ANSWER, and CONNECT xxxx (where xxxx is the VF data
rate).

Disable – Only OK, CONNECT, RING, NO CARRIER, and ERROR result codes appear.
NOTE: NO DIALTONE is valid only if Dial T one Detect configuration option is enabled. BUSY appears if Busy Detect

Add/EC – Places the EC suffix after the result code text if error control is used. For example, CONNECT 9600/EC
Add/V.42,MNP – Places either the /V.42 or /MNP suffix after the result code text if data compression is used. For

example, CONNECT 9600/V42b.
Use DTE Rate – Allows the DTE rate to be displayed in the Connect message instead of the line rate. This feature is

required in some modem pooling applications.
The factory default is Enable.

A T command to disable is X0.
A T commands to enable are X1, X2, X3, or X4.
A T command for Add/EC is X5.
A T command for Add/V42, MNP is X6.
AT command for Use DTE Rate is X7.

* This configuration option only appears if DTE Dialer Type is configured for AT.

configuration option is enabled.

9-173810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 9-2

(4 of 5)

DTE Dialer Configuration Options

*ResultCode Form: Words

Nxt Words Numbers (1) Numbers (2)

Result Codes Format. Controls whether or not result codes appear as words or as numeric codes. Some DTEs do not
recognize Result Codes as words; therefore, numbers are required. The Numbers (2) format is required for some
modem pooling applications. (For a list of result codes, refer to Table B-1 in Appendix B.)

The factory default is Words.
A T command for Numbers (1) is V0.

A T command for Words format is V1.
A T command for Numbers (2) is V2.

*AT Cmnd Mode: Normal

Nxt Normal No_ERROR NoStrapOrERR

A T Command Mode. Determines how the modem responds to valid and invalid AT commands.

NOTE: Since this configuration option affects AT commands, it cannot be changed by the AT&F command. However, it

Normal – Allows normal operation of the AT command set. The modem acts upon all valid AT commands and issues the

ERROR result code for invalid commands. If a string with multiple commands is entered, then an invalid command within
that string will prevent the execution of subsequent valid commands.

can be changed by selecting a factory preset configuration via the DCP.

No ERROR – Operates similar to Normal mode, however, the modem does not issue an ERROR result code for invalid
commands. When an invalid command is encountered, the modem ignores it and issues the OK result code. If a string
with multiple commands is entered, then an invalid command within that string will not prevent the execution of
subsequent valid commands.

No Strap or ERROR – Ignores all A T commands (including valid commands) that cause a configuration option to
change. Only nonconfiguring commands (for example A TD, ATA, and ATI) are executed; the ERROR result code is
never returned.

The factory default is Normal.
A T command is S-register S84 = n, where n is 0 or 231 for Normal, 1 or 232 for No ERROR, or 2 or 233 for No Strap or

ERROR.

V25bis Coding: ASCII
Nxt ASCII EBCDIC

V.25bis Coding. Identifies to the modem whether the DTE is using ASCII code or EBCDIC code for V.25bis commands.
The modem responds to the DTE using the same coding.

NOTE: This configuration option only appears if DTE Dialer is configured for V25bis HDLC or V25bis Bsync.
The factory default is ASCII.

A T command is S-register S62 = n, where n is 0 for ASCII or 1 for EBCDIC.

V25bis IdleFill: Mark
Nxt Mark Flag

V.25bis Idle Fill. Determines whether a mark or flag is used as an idle fill character for the DTE. The modem responds to
the DTE using the same idle fill.

NOTE: This configuration option only appears if DTE Dialer is configured for V25bis HDLC.
The factory default is Mark.

A T command is S-register S63 = n, where n is 0 for Mark or 1 for Flag.

* This configuration option only appears if DTE Dialer Type is configured for AT.

9-18 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-2

(5 of 5)

DTE Dialer Configuration Options

V.25b NewLineChr: CR+LF
Nxt CR+LF CR LF

V.25bis New Line Character. Sets the modem for the command line terminator used by the DTE in V.25bis Async mode.
The modem responds to the DTE using the same line terminator.

NOTE: This configuration option only appears if DTE Dialer is configured for V25bis Async.
The factory default is CR+LF.

A T command is S-register S64 = n, where n is 0 for carriage return and line feed, 1 for carriage return, or 2 for line feed.

DTR Cont Repeat: Disable
End Disable Enable

DTR Cont Repeat. Determines whether automatic redialing stops after the directory locations defined by DTR Auto
Redial (S37) have all been tried unsuccessfully once. If DTR Cont Repeat is enabled, automatic redialing starts again
with directory location 1. The default is Disable.

A redial attempt is made in response to a bad phone number, a busy signal, no answer, or no quiet answer. However, a
lockout from redialing occurs if ten successive failing call attempts are made to the same number.

DTR Cont Repeat is accessible only if the DTE Dialer Type is DTR=Dirs.

Disable – Automatic redialing will not be repeated.
Enable – Automatic will be repeated if necessary.

A T command is S-register S38 = n, where n is 0 for Disable and 1 for Enable.

9-193810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Line Dialer

T able 9-3 shows each Line Dialer configuration option

as it appears on the LCD, with the Async Dial factory

The Line Dialer configuration options establish
parameters used by the modem to answer or originate
calls.

default setting (the default value if the modem is just
being installed) shown following the colon (:) on the first
line and with all available selections listed on the second
line. Following this is a description of the configuration
option, a description of the available selections, and any
equivalent AT commands.

Table 9-3

(1 of 5)

Line Dialer Configuration Options

AutoAnswerRing#: 1
Nxt 1 Disable 246810

Auto-Answer Ring Count. Determines the number of rings necessary before the answering modem answers an incoming
call. For example, if this option is set for 2, then the answering modem answers after the second ring.

NOTE: Although DCP selections are limited (1, 2, 4, 6, 8, or 10), values set by AT commands can display from 1 to

255 rings.

Disable – If selected, the modem must be answered using either the DCP’s Answer command or Tlk/Data function or
via AT commands.

The factory default is 1.
A T command to disable is S0 = 0.

A T command is S-register S0 = n, where n is a ring count from 1 to 255.

Dialer T ype: Tone
Nxt Tone Pulse

Dialer Type. Selects either tone (DTMF) dialing or pulse (rotary) dialing mode.
The factory default is Tone.
A T command for tone dialing is T.

A T command for pulse dialing is P.

DialT one Detect: Enable
Nxt Enable Disable

Dial Tone Detect. Sets the modem for dial tone detection (enable) or blind dialing (disable).
Enable – Modem disconnects the call if a dial tone is not detected within 10 seconds and displays No Dial Tone on both

the LCD and asynchronous DTE terminal.
Disable – Modem dials a call whether or not it detects a dial tone on the line. This is known as blind dialing. The period

of time the modem waits before dialing is specified in the Blind Dial Pause configuration option.
The factory default is Enable.

A T commands to disable are X0, X1, and X3.
A T commands to enable are X2, X4, X5, X6, and X7.

9-20 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-3

(2 of 5)

Line Dialer Configuration Options

Blind Dial Paus: 2sec
Nxt 2sec 4sec 6sec 8sec 10sec 20sec

Blind Dial Pause. Determines how long the modem waits before dialing a telephone number when DialTone Detect is
disabled.

NOTE: The Blind Dial Pause configuration option only appears when the Dial Tone Detect configuration option is

disabled.

The factory default is 2sec.
A T command is S-register S6 = n, where n is a value from 2 to 255 in 1-second increments.

BusyT one Detect: Enable
Nxt Enable Disable

Busy Tone Detect. Sets the modem to monitor for Busy Tone (Enable) or ignore Busy Tone (Disable).
This configuration option is normally enabled; however, if the modem receives false busy tones, this configuration option

can be disabled and the modem ignores all busy tones.
The factory default is Enable.
A T commands to disable are X0, X1, and X2.

A T commands to enable are X3, X4, X5, X6, and X7.

‘‘,” Pause Time: 2sec
Nxt 2sec 4sec 6sec 8sec 10sec 20sec

Pause Time. Determines the number of seconds the modem pauses when it encounters a comma (,) in the dial
command string.

NOTE: Although DCP selections are limited (2, 4, 6, 8, 10, or 20), values set by the AT commands can display from 0 to

255 seconds.

The factory default is 2sec.
A T command is S-register S8 = n, where n is a value from 0 to 255 in 1-second increments.

NoAnswer Timout: 45sec
Nxt 45sec 30sec 60sec 120sec

No Answer Abort Time-out. Determines the number of seconds an originating modem waits before abandoning a call
attempt when no answer tone is received.

NOTE: Although DCP selections are limited (30, 45, 60, or 120), values set by AT commands can display from 1 to

255 seconds.

The factory default is 45sec.
A T command for No Answer Timeout is S-register S7 = n, where n is a value from 1 to 255 in 1-second increments.

9-213810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 9-3

(3 of 5)

Line Dialer Configuration Options

Fast Disconnect: Disable
Nxt Disable Enable

Fast Disconnect. Allows the modem to disconnect immediately after receiving a disconnect command from a local DTE
or its own diagnostic control panel.

Disable – The modem follows its normal disconnect sequence by issuing a cleardown sequence or long space
disconnect. This is also known as a graceful disconnect since the other modem receives advance notice of a
disconnection.

Enable – Use this setting if the DTE requires that the modem be made available as soon as possible after receiving a
disconnect command.

NOTE: This abrupt method of disconnecting may cause problems with the remote modem, which may interpret the

disconnection as an error instead of a valid disconnect.

The factory default is Disable.
A T command is S-register S85 = n, where n is 0 for Disable and 1 for Enable.

Line Crnt Disc: Enab(>8msec)
Nxt Enab(>8msec) Enab(>90msec) Disable

Line Current Disconnect. Determines the modem’s response to short interruptions of line current. The loss of line current
is one method of disconnecting a call.

Enable > 8-millisecond – Disconnects the modems if line current is disrupted for more than 8 milliseconds.
Enable > 90-millisecond – Disconnects the modems if line current is disrupted for more than 90-milliseconds. Use this

setting if the modem constantly disconnects when set for Enab(>8msec).
Disable – Ignores any disruptions in line current such as call waiting.
The factory default is Enab(>8msec).

A T command is S-register S65 = n, where n is 0 for Enable (>8 msec), 1 for Enable (>90 msec), and 2 for Disable.

Long Space Disc: Enable
Nxt Enable Disable

Long Space Disconnect. Determines the modem’s response to a continuous spacing condition sent from the remote
modem when it goes on-hook. Issuing a long space is one method of disconnecting a call.

NOTE: This configuration option is ignored when the modem operates in Synchronous mode or Dial Backup mode.
Enable – Modem disconnects if it receives a continuous space from the DTE. The modem’s transmitter will transmit

4 seconds of long space upon a disconnect.
Disable – Modem does not disconnect if it receives a continuous space from the DTE. Modem will not transmit a long

space disconnect.
For Async Dial, UNIX Dial, and Sync Leased, Enable is the factory default.

For Sync Dial, Disable is the factory default.
A T command for Disable is Y0.

A T command for Enable is Y1.

9-22 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-3

(4 of 5)

Line Dialer Configuration Options

No Carrier Disc: 2sec
Nxt 2sec 5sec Disable 10sec 20sec

No Carrier Disconnect. If the modem no longer receives carrier from the remote modem, it disconnects the call. This
configuration option determines how long carrier is Off before the modem disconnects. Loss of carrier is one method of
disconnecting a call.

2, 5, 10, 20 sec – Modem disconnects if carrier turns Off for more than 2 seconds, 5 seconds, 10 seconds, or
20 seconds.

Disable – Modem does not disconnect if carrier turns Off.
The factory default is 2sec.

A T command is S-register S10 = n, where n is 255 for disable or 0 to 254 in 0.1 second increments for enable.

No Data Disc: Disable
Nxt Disable 10min 30min 60min

No Data Disconnect. Forces the modem to disconnect if no data is transmitted or received within a specified amount of
time.

Disable – Modem remains connected despite the lack of data flow.
10, 30, 60 min – Modem disconnects if data is not received or transmitted within 10-minute, 30-minute, or 60-minute

intervals.
The factory default is Disable. The reloading of factory defaults does not affect No Data Disconnect.

A T command to enable is \Tn, where n is a value from 1 minute to 255 minutes. AT command to disable is \T0.

NoDataDiscTrig
Nxt TXD or RXD TXD and RXD TXD Only RXD Only

No Data Disconnect Trigger Signal. Works in conjunction with No Data Disconnect (\T), and determines whether Pin 2
(transmit data) or Pin 3 (receive data) of the modem’s RS-232 serial interface is monitored so that the modem can
disconnect the call if there is no activity for a certain period of time.

The No Data Disconnect Trigger Signal configuration option is unavailable and is not displayed on the DCP when No
Data Disconnect is disabled. The factory default is TXD or RXD. The reloading of factory defaults does not affect No
Data Disconnect Trigger Signal.

TXD or RXD – Disconnect if no data transmitted or received for specified period.
TXD and RXD – Disconnect if no data transmitted and received for specified period.
TXD Only – Disconnect if no data transmitted for specified period.
RXD Only – Disconnect if no data received for specified period.

A T command is S80 = n:

S80 = 0 Transmit or Receive
S80 = 1 Transmit Only
S80 = 2 Receive Only
S80 = 3 Transmit and Receive

9-233810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 9-3

(5 of 5)

Line Dialer Configuration Options

Auto Make Busy: Disable
Nxt Disable Enable

Automatic Make Busy . Forces the modem to go off-hook under the following conditions: a local analog loopback is
performed, a self-test is performed, or if the modem is switched to the service line. This option is only valid with the
Model 3811 and does not appear on the Model 3810’s or Model 3820’s LCD.

NOTE: This configuration option should only be used when the modem is located behind a user’s Private Branch

The factory default is Disable.
A T command is S-register S40 = n, where n is 0 for Disable and 1 for Enable.

MakeBusyViaDTR: Disable
Nxt Disable Enable

Make Busy Via DTR. Determines if the modem goes off-hook when DTR is Off. Enable this setting if the DTE normally
keeps DTR ON and turns DTR Off when the DTE cannot accept a call.

NOTE: This configuration option should only be used when the modem is located behind a user’s Private Branch

The factory default is Disable.
A T command is S-register S69 = n, where n is 0 for Disable and 1 for Enable.

Exchange (PBX). The Make Busy Network Interface Module (NIM) must be installed on the COMSPHERE
3000 Series Carrier. Refer to the COMSPHERE 3000 Series Carrier, Installation Manual.

Exchange (PBX). For 381 1 modems, the MakeBusy Network Interface Modules (NIMs) must be installed on the
COMSPHERE 3000 Series Carrier. Refer to the COMSPHERE 3000 Series Carrier, Installation Manual.

DTR Auto Redial
End Dir 1 Dirs 1-2 Dirs 1-3 Dirs 1-4 Dirs 1-5 Dirs 1-6 Dirs 1-7 Dirs 1-8 Dirs 1-9 Dirs 1-10

DTR Auto Redial. Defines the number of directory locations the modem may access when prior dialing attempts fail. For
example, the selection Dirs1-10 means that all ten directory locations may be tied. The default is directory location 1
only.

DTR Auto Redial represents the same internal setting as that accessed with the Auto Redial configuration option in the
Leased-Line group. However, DTR Auto Redial is in effect (and can be accessed) only if the DTE Dialer Type is
DTR=Dirs.

Dir 1 The modem will use only Directory Location 1 for automatic dial backups.
Dirs 1-2 The modem will use Directory Location 2 in the event of call failure using Directory Location 1.
Dirs 1-3 The modem will use Directory Location 3 in the event of call failure using the preceding entries.

SSS

SSS

Dirs 1-10 The modem will use Directory Location 10 in the event of call failure using the preceding entries.
A T command is S-register S37 = n:

S37 = 0 Use Directory Location 1
S37 = 1 Use Directory Locations 1–2
S37 = 2 Use Directory Locations 1–3
S37 = 3 Use Directory Locations 1–4

SS S
SS S

S37 = 9 Use Directory Locations 1–10

9-24 September 1998 3810-A2-GB30-30

Configure Branch

Dial Line

T able 9-4 shows each Dial Line configuration option as

it appears on the LCD, with the Async Dial factory default

The Dial Line configuration options are used to
configure the modem for operation over dial lines.

setting (the default value if the modem is just being
installed) shown following the colon (:) on the first line
and with all available selections listed on the second line.
Following this is a description of the configuration option,
a description of the available selections, and any
equivalent AT commands.

Table 9-4

(1 of 3)

Dial Line Configuration Options

Dial LineRate: 19200(V32t)
Nxt 19200(V32t) 16800(V32t) 14400(V32b) 12000(V32b) 9600(V32b) 7200(V32b) 4800(V32b) 2400(V22bis)
1200(V22) 1200(212A) 0–300(V21) 0–300(103J)

Dial Line Rate. This configuration option determines the modem’s data rate and modulation scheme for operation on dial
lines. Online changes do not take effect until a disconnect occurs.

19200(V32t), 16800(V32t), 14400(V32b), 12000(V32b), 9600(V32b), 7200(V32b), 4800(V32b) – The modem operates
using V.32terbo, V.32bis, or V.32 modulation at the data rate selected. The modem can be forced by the remote modem
to a lower data rate.

2400(V22bis), 1200 (V22), 1200(212A) – Modem operates using the modulation and data rate selected.
0–300(V21), 0–300(103J) – Modem operates in full-duplex, Asynchronous mode. These data rates do not support V.42

or MNPt error control.
The factory default is 19200(V32t).

A T command for Dial Line Rate is S-register S41 = n, where n is:

1 = 14,400 (V.32bis) 7 = 1200 (V.22)
2 = 12,000 (V.32bis) 8 = 1200 (212A)
3 = 9600 (V.32bis/V.32) 10 = 0–300 (V21)
4 = 7200 (V.32bis) 1 1 = 0–300 (103J)
5 = 4800 (V.32bis/V.32) 20 = 19,200 (V.32terbo; default)
6 = 2400 (V.22bis) 21 = 16,800 (V.32terbo)

V32bis Automode: Enable
Nxt Enable Disable System 85

Enable – The modem automatically adapts to the modulation scheme and line rate of the remote modem. However, the

maximum data rate the modem uses is determined by the Dial Line Rate configuration option. Bell 103J protocol is used
for data rates of 0–300 bps.

Disable – Connection fails if the remote modem does not support the selected modulation.
System 85 – Modifies parameters used by the connection process. Specify System 85 only if your modem is in a

modem pool attached to a System 85 Private Branch Exchange (PBX).
The factory default is Enable.

A T command is S-register S78 = n, where n is 0 for Enable,1 for Disable, or 2 for System 85.

9-253810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 9-4

(2 of 3)

Dial Line Configuration Options

V32bis Autorate: Enable
Nxt Enable Disable StartAt48 StartAt96

Enable – Once connected, the modem automatically lowers the line rate if line conditions become impaired. When line

conditions improve, the modem automatically shifts up to the highest data rate the line can support. This autorating only
occurs between 14,400 bps and 4800 bps during V.32/V.32bis connections.

Disable – Line rate does not vary.
StartAt48, StartAt96 – Useful for lines with known noise problems, these settings cause the modem to connect at

4,800 bps (StartAt48) or 9,600 bps (StartAt96). If line conditions warrant it, the modem shifts up to the next higher rate
until 14,400 bps or the highest possible rate for the line is reached.

The factory default is Enable.
A T command for V.32bis Autorate is S-register S76 = n, where n is 0 for Enable, 1 for Disable, 2 for StartAt48, and 3 for

StartAt96.

Dial TX Level: Permissv(–9)
Nxt Permissv(–9) –10 dBm –11 dBm –12 dBm –13 dBm –14 dBm –15 dBm –16 dBm –17 dBm

–18 dBm –19 dBm –20 dBm –21 dBm –22 dBm –23 dBm –24 dBm –25 dBm –26 dBm –27 dBm
–28 dBm –29 dBm –30 dBm –31 dBm –32 dBm ETC 1.0_Cell ETC 1.1_Cell

Dial Transmit Level. Sets the power output level of the transmit signal over dial lines.

Permissive (–9 dBm) – The modem transmits data at approximately –9 dBm.
ETC 1.0_Cell – V alid only if Enhanced Throughput Cellular (ETC) is installed. Transmit level is automatically adjusted in

response to line conditions according to the proprietary ETC 1.0 specification. Use only with remote modems set to ETC

1.0_Cell, and limit the data rate to 4800 bps.
ETC 1.1_Cell – V alid only if ETC is installed. Transmit level is automatically adjusted in response to line conditions

according to the proprietary ETC 1.1 specification.
The factory default is Permissv(–9).

A T command for Permissive mode is &J0.
A T commands for –10 through –32 dBm are &I10 through &I32.
A T command for ETC 1.0_Cell is &I99.
A T command for ETC 1.1_Cell is &I100.

V22b Guard Tone: Disable
Nxt Disable 550Hz 1800Hz

V.22bis Guard Tone. Determines whether the V.22bis guard tone is disabled, set to 550 Hz, or set to 1800 Hz.

Disable – No guard tone.
550 Hz or 1800 Hz – When the modem is in Answer mode, it transmits the guard tone at this frequency.

The factory default is Disable.
A T command to disable is &G0. AT command for 550 Hz is &G1.

A T command for 1800 Hz is &G2.

9-26 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-4

(3 of 3)

Dial Line Configuration Options

V32bis Train: Long
Nxt Long Short

V.32bis Train. Controls V.32bis and V.32 train. Determines whether minimum or maximum time durations are used during
the V.32bis/V.32 handshaking sequence for both dial and 4-wire/2-wire leased line applications.

NOTE: This configuration option only appears when the Dial Line Rate configuration option is set for Auto:148-3 or any

fixed V.32bis data rate.

Long – Selects long train. Use this setting whenever far-end frequency offset (phase roll) may be encountered. This is
usually only required when transmitting over satellite links.

Short – Allows the modem to train-up faster when using V.32bis/V.32 modulation.
The factory default is Long.

A T command is S-register S43 = n, where n is 0 for Long and 1 for Short.

FallFwdDelay: Disable
End Disable 5_mins 15_mins 1_hour

Fall Forward Delay . Provides an initial delay before leased or dial lines are monitored for fall forward conditions. After the
timer expires, monitoring occurs as usual. Possible delay times are 5 minutes, 15 minutes, or 1 hour.

The factory default is Disable (no delay).
NOTE: Fall Forward Delay appears under both the Dial Line configuration options and the Leased Line configuration

There is no analogous A T command, so this option is not available for modems without a shared or integral DCP.

options, but the same setting is used for both. Changing it in one place effectively changes it in the other .

9-273810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Leased Line

T able 9-5 shows each Leased Line configuration option

as it appears on the LCD, with the Async Dial factory

The Leased Line configuration options are used to
configure the modem for operation over leased lines.

The Leased Line configuration group only appears if
the modem is configured with the Sync Leased factory
preset template, or when the &L1, &L2, &L3, or &L4
command is issued.

default setting (the default value if the modem is just
being installed) shown following the colon (:) on the first
line and with all available selections listed on the second
line. Following this is a description of the configuration
option, a description of the available selections, and any
equivalent AT commands.

Table 9-5

(1 of 5)

Leased Line Configuration Options

Leased Mode: 4WLL-Orig
Nxt 4WLL-Orig 4WLL-Ans 2WLL-Orig 2WLL-Ans

Leased Mode. Sets the modem for either 2-wire or 4-wire operation in Answer mode (receiving a call) or 2-wire or 4-wire
operation in Originate (initiating a call) mode. The only options available for Model 3820 modems are 2WLLOrig and
2WLL-Ans.

NOTE: For proper operation over leased lines, one modem must be set for Originate mode and the other set for Answer

For Sync Leased Answer Mode, 4-wire Answer is the factory default. (Two-wire Answer for the Model 3820.)
For Sync Leased Originate Mode, 4-wire Originate is the factory default. (Two-wire Originate for the Model 3820.)

A T command for Disable is &L0.
A T command for 2-wire Originate is &L1.
A T command for 4-wire Originate is &L2.
A T command for 2-wire Answer is &L3.
A T command for 4-wire Answer is &L4.

mode.

LeasedLine Rate: 19200(V32t)
Nxt 19200(V32t) 16800(V32t) 14400(V32b) 12000(V32b) 9600(V32b) 7200(V32b) 4800(V32b) 2400(V22bis)
14400(V33) 12000(V33) 9600(V29) 7200(V29) 4800(V29)

Leased-Line Rate. Determines the modem’s data rate and modulation scheme for operation on leased lines.
19200(V.32t), 16800(V32t), 14400(V.32bis), 12000(V.32bis), 9600(V.32bis), 7200(V.32bis), 4800(V.32bis) – These

modulation schemes are available on 2-wire or 4-wire leased lines. If a fixed V.32bis rate is selected, the modem can still
be commanded to fall back by a remote modem.

NOTE: The modem must be in Direct mode before the modulation scheme can be changed from V.32bis to another

leased-line modulation (V.33 or V.22bis). See Err Contrl Mode configuration option for more about Direct mode.
On leased lines, V.42 error control and Buffer mode are only supported by V.32bis. An error occurs if the modem
is not in Direct mode when the modulation is changed from V.32bis. In asynchronous mode using V.22bis, the
DTE rate must equal the leased-line rate.

2400(V.22bis) – This modulation scheme is available on 2-wire and 4-wire leased lines.
14400(V.33), 12000(V.33), 9600(V.29), 7200(V.29), 4800(V.29) – These modulation schemes are available only on 4-wire

leased lines when the V.29 or V.33 options are installed, and are not available for the Model 3820.
NOTE: It is recommended that both modems use the same fixed data rate.

The factory default is 19200(V32t).
A T command is S-Register S44=n, where n is:

0, 1 = 14,400 bps (V.32bis) 12 = 12,000 bps (V.33)

2 = 12,000 bps (V.32bis) 13 = 9600 bps (V.29)
3 = 9600 bps (V.32bis) 14 = 7200 bps (V.29)
4 = 7200 bps (V.32bis) 15 = 4800 bps (V.29)
5 = 4800 bps (V.32bis) 18 = 19,200 (V.32terbo; default)
6 = 2400 bps (V.22bis) 19 = 16,800 (V.32terbo)

11 = 14,400 bps (V.33)

9-28 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-5

(2 of 5)

Leased Line Configuration Options

V32bis Autorate: Enable
Nxt Enable Disable

V.32bis Autorate. Once connected, the modem automatically lowers the line rate if line conditions become impaired.
When line conditions improve, the modem automatically shifts up to the highest data rate the line can support. This
autorating only occurs between 14,400 bps and 4800 bps during V.32/V.32bis connections.

The factory default is Enable.
A T command for V.32bis Autorate is S-register S82 = n where n is 0 for Enable and 1 for Disable.

Leased TX Level: 0
Nxt 0 –1 –2 –3 –4 –5 –6 –7 –8 –9 –10 –11 –12 –13 –14 –15

Leased Transmit Level. Selects the modem’s transmit power level over leased lines. The transmit output level can be
selected in 1 dBm decrements from 0 dBm to –15 dBm.

The factory default is 0 dBm.
A T command is S-register S45 = n, where n is a value from 0 to 15 corresponding from 0 dBm to –15 dBm.

2W SQ Retrain: Disable
Nxt Disable 1 2 3 4 5

2-Wire Leased Line Signal Quality Retrain. Forces the modem to retrain if the SQ (Signal Quality) LED is on for more
than the specified number of seconds (1–5).

2W SQ Retrain reduces the amount of bad data sent to the DTE when no error control is used, but greatly increases the
likelihood of retrains on impaired lines, especially when Autorate is disabled.

NOTE: This configuration option is available only if Leased Mode is 2WLL-Orig or 2WLL-Ans and affects only V.32 and

V.32bis modulations.

The factory default is Disable.
A T command is S-register S81 = n where n is 0 for Disable or 1 to 5 for 1 to 5 seconds.

1800HzTrainTone: Disable
Nxt Disable Enable

1800 Hz Training Tone. This configuration option is for communicating with certain modems that do not comply with the
V.32 standard. When 1800 Hz Training Tone is enabled, a short burst of 1800 Hz (AC) tone is sent to the answering
modem to prompt it to answer. This is not required for V.32-compliant modems.

The factory default is Disable.
A T command is S-register S34 = n, where n is 0 for Disable and 1 for Enable.

9-293810-A2-GB30-30 September 1998

COMSPHERE 3800 Series Modems

Table 9-5

(3 of 5)

Leased Line Configuration Options

BdLn Auto Orig: Disable
Nxt Disable Enable FastBackup 2_min 5_min 10_min

Bad Lines Auto Originate. Allows the modem to dial the number stored in directory location 1 to restore communications
with the remote modem when the leased lines fail.

This configuration option must be enabled in both the local and remote modem. The Answer mode modem must have its
Auto-Answer Ring Number configuration option enabled. Refer to the Line Dialer configuration option group for
information regarding Auto-Answer.

Disable – The modem will not perform a Bad Lines Auto Originate.
Enable – The modem will originate a call after 30 seconds of continuous bad-line conditions.
FastBackup – The modem will originate a call after 20 seconds of continuous bad-line conditions.
2_min – The modem will originate a call after 2 minutes of continuous bad-line conditions.
5_min – The modem will originate a call after 5 minutes of continuous bad-line conditions.
10_min – The modem will originate a call after 10 minutes of continuous bad-line conditions.

This configuration option is not available on the Model 3820.
The factory default is Disable.
A T command is S-register S46 = n:

S46 = 0 Disable
S46 = 1 30 Seconds
S46 = 2 20 Seconds
S46 = 3 60 Seconds
S46 = 4 90 Seconds
S46 = 5 120 Seconds
S S S
S S S
S46 = 21 600 Seconds

Note that the effect of S46 = 2 is out of sequence with the other values.

9-30 September 1998 3810-A2-GB30-30

Configure Branch

Table 9-5

(4 of 5)

Leased Line Configuration Options

Rate Auto Orig: Disable
Nxt Disable OnFlBkTo48 OnFlBkTo72 OnFlBkTo96 OnFlBkTo120 OnFlBkTo144 OnFlBkTo168

Rate Auto Originate. Initiates a dial backup call, using the phone number in directory location 1, when the leased-line
rate of the modem falls back to or below a certain speed.

Disable – The modem will not perform a Rate Auto Originate.
OnFlBkTo48 – If the leased-line rate of the modem falls back to 4800 bps, a dial backup attempt will be initiated.
OnFlBkTo72 – If the leased-line rate of the modem falls back to 7200 bps, a dial backup attempt will be initiated.
OnFlBkTo96 – If the leased-line rate of the modem falls back to 9600 bps, a dial backup attempt will be initiated.
OnFlBkTo120 – If the leased-line rate of the modem falls back to 12,000 bps, a dial backup attempt will be initiated.
OnFlBkTo144 – If the leased-line rate of the modem falls back to 14,400 bps, a dial backup attempt will be initiated. This

is available only on modems with the V.32terbo feature.
OnFlBkTo168 – If the leased-line rate of the modem falls back to 16,800 bps, a dial backup attempt will be initiated. This

is available only on modems with the V.32terbo feature.
A T command is S36 = n:

S36 = 0 Disable
S36 = 1 OnFlBkTo48
S36 = 2 OnFlBkTo72
S36 = 3 OnFlBkTo96
S36 = 4 OnFlBkTo120
S36 = 5 OnFlBkTo144
S36 = 6 OnFlBkTo168

NOTE: Rate Auto-Originate is valid only when V.32bis Autorate is enabled (S76 = 0).
Auto Redial

Nxt Dir_1 Dirs_1-2 Dirs_1-3 Dirs_1-4 Dirs_1-5 Dirs_1-6 Dirs_1-7 Dirs_1-8 Dirs_1-9 Dirs_1-10

Auto Redial. Works in conjunction with the Bad Lines Auto Originate and Rate Auto Originate options. It allows repeated
automatic dial backup attempts by specifying the range of Directory Locations that can be tried. The modem must be in
Originate mode.

Dir_1 – The modem will use only Directory Location 1 for automatic dial backups.
Dirs_1-2 – The modem will use Directory Location 2 in the event of call failure using Directory Location 1.
Dirs_1-3 – The modem will use Directory Location 3 in the event of call failure using the preceding entries.

SS S

SS S
Dirs_1-10 – The modem will use Directory Location 10 in the event of call failure using the preceding entries.
A T command is S-register S35 = n:

S35 = 0 Use Directory Location 1
S35 = 1 Use Directory Locations 1–2
S35 = 2 Use Directory Locations 1–3
S35 = 3 Use Directory Locations 1–4

SS S

SS S

S35 = 9 Use Directory Locations 1–10

9-313810-A2-GB30-30 September 1998