Paradyne COMSPHERE 3920Plus, COMSPHERE 3921Plus Technical Reference Manual
COMSPHERE
392xP
MODELS 3920P
LUS MODEMS
LUS
AND 3921PLUS
TECHNICAL REFERENCE MANUAL
Document No. 3920-A2-GH30-41
February 2002
COMSPHERE 392xPlus Modems
COMSPHERE
392xPlus Modems
Models 3920Plus and 3921Plus
Technical Reference Manual
3920-A2-GH30-41
6th Edition (February 2002)
Changes and enhancements to the product and to the information herein will be documented and issued as a new release or
a Firmware Update Description document to this manual.
For the Model 3920Plus standalone modems, the Universal Service Order Code (USOC) for Permissive mode is RJ11C.
The Canadian equivalent to RJ11C is CA11A. For the 3921Plus carrier-mounted modems, the USOC for Permissive mode
is RJ21X. The Canadian equivalent to RJ21X is CA21A.
For regulatory approval, refer to the product labeling or contact your local representative.
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 W orld Wide Web 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
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, 2002 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 February 2002 3920-A2-GH30-41
Important Safety Instructions
1. Read and follow all warning notices and instructions marked on the product or included in the
manual.
2. Some models are provided 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.
9. 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.
B3920-A2-GH30-40 October 1998
COMSPHERE 392xPlus 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 INTERFACE-CAUSING
EQUIPMENT REGULATIONS.
CET APPAREIL NUMERIQUE DE LA CLASSE [A] RESPECTE TOUTES LES EXIGENCES DU REGLEMENT SUR LE
MATERIEL BROUILLEUR DU CANADA.
C October 1998 3920-A2-GH30-40
Table of Contents
Preface
Objectives and Reader Assumptions vii. . . . . . . . . . . . . . . . . . . . . . . . .
How to Use This Manual vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Documents viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Introduction
Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392xPlus Models 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Operational Modes 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Modem Features 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Singleport Modem Features 1-7. . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Multiport Modem Features 1-7. . . . . . . . . . . . . . . . . . . . . . . .
Applications 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Government Requirements and Equipment Return 1-10. . . . . . . . . . . . . .
T echnical Specifications 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Modem Installation
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Modem Package 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3920Plus Modem Installation 2-3. . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Cables to the Model 3920Plus Modem 2-3. . . . . . . . . . . . .
Removing and Replacing the Model 3920Plus Modem 2-8. . . . . . . . . .
Model 3921Plus Modem Installation 2-8. . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Model 3921Plus Modem 2-13. . . . . . . . . . . . . . . . . . . . . .
392xPlus Modem Power-Up 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting Factory Configuration Options 2-13. . . . . . . . . . . . . . . . . . . . .
3. DCP Operation
Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Control Panels 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Indicators 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Control Panel Operation 3-6. . . . . . . . . . . . . . . . . . . . . . . . .
Menu Structure 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
i3920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
4. Status Branch
5. Configure Branch
6. Poll List Branch
7. Control Branch
Status Branch 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure Branch 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration T ables 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiport Mode 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Singleport Mode 5-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Poll List Branch 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Branch 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Test Branch
T est Branch 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. Sub-Network Health and Status Branch
Sub-Network Health and Status Branch 9-1. . . . . . . . . . . . . . . . . . . . . .
10. Call Setup Branch
Call Setup Branch 10-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. Talk/Data Branch
T alk/Data Branch 11-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12. Dial Access Security
Overview 12-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Branch 12-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Configuration Options 12-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Password Entry T echniques 12-16. . . . . . . . . . . . . . . . . . . . . . . . .
Database T able Examples 12-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13. Remote Branch
ii October 1998 3920-A2-GH30-40
Remote Branch 13-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14. AT Command Set and S-Registers
Overview 14-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command and Data Modes 14-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Guidelines 14-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT Command List 14-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S-Register List 14-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices
A. Menu Tree A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Troubleshooting B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Pin Assignments C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D. ITU-T V.25bis Dialing Commands and Responses D-1. . . . . . . . . .
E. ASCII Character T able E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F. Default Configuration Options F-1. . . . . . . . . . . . . . . . . . . . . . . . .
G. Sample Configurations G-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H. Synchronous Data Compression H-1. . . . . . . . . . . . . . . . . . . . . . . .
I. Equipment List I-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
Glossary
Index
iii3920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
Figure Page
1-1 3920-A2 Standalone Modem 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 3920-A1 Standalone Singleport and Multiport Modems 1-3. . . . . . . . . . . . . . . . . . . . . .
1-3 Model 3921Plus Singleport Modem 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 Model 3921Plus Multiport Modem 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Model 3920Plus Singleport (3920-A2-xxx) Back Panel and Power Supply 2-4. . . . . . .
2-2 Model 3920Plus Multiport Back Panel and Power Supply 2-5. . . . . . . . . . . . . . . . . . . .
2-3 Model 3921Plus Back Connector Plates 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4 Installing the Model 3921Plus Modem 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5 Circuit Pack Lock 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Model 3920Plus DCP 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Optional SDCP and Model 3921Plus Faceplates 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 392xPlus LCD and Keypad 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1 DCP Configuration Process 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-1 Local Analog Loopback 8-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-2 Remote Digital Loopback 8-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-3 Local Digital Loopback 8-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-4 Pattern T est and Local Analog Loopback Test 8-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-5 Pattern T est and Digital Loopback Test 8-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-6 End-to-End Pattern T est 8-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1 Dial Backup 10-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-1 VF Pin Orientation C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-2 Wiring Diagram — “Y” Cable for External Telephone C-4. . . . . . . . . . . . . . . . . . . . . . .
C-3 Wiring Diagram — 8-Position to 6-Position Crossover Cable C-5. . . . . . . . . . . . . . . . .
C-4 Wiring Diagram — 25-Pin Crossover Cable C-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-1 Sample Configuration — Point-to-Point G-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-2 Sample Configuration — Extended Point-to-Point G-4. . . . . . . . . . . . . . . . . . . . . . . . . .
G-3 Sample Configuration — Extended Multipoint G-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-4 Sample Configuration — Point-to-Point with Automatic Dial Backup G-8. . . . . . . . . .
G-5 Sample Configuration — Point-to-Point with Network Management G-10. . . . . . . . . . .
G-6 Sample Configuration — Carrier with Network Management G-12. . . . . . . . . . . . . . . . .
G-7 Sample Configuration — Extended Diagnostics G-14. . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-8 Sample Configuration — Digital Bridge G-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-9 Sample Configuration — Point-to-Point MSD G-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-10 Sample Configuration — Multipoint MSD G-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-1 Sample DTE Exchange of Data via Synchronous Protocol and SDC H-1. . . . . . . . . . . .
H-2 Synchronous Data Compression H-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-3 Synchronous Data Format H-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-4 Clocks at the DTE–DCE Interface H-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Figures
iv October 1998 3920-A2-GH30-40
Table of Contents
List of Tables
Table Page
1-1 392xPlus Operational Modes 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 T echnical Specifications for 392xPlus Modems 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 392xPlus DCP LEDs 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 SDCP LEDs 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 T op-Level Menu Status 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Common Operational Messages 3-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Dial Access Security Messages 3-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 Health and Status Messages 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 SDC Performance Measurements 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3 Backup Status Screens 4-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1 DTE Interface Configuration Options — Multiport Mode 5-10. . . . . . . . . . . . . . . . . . . .
5-2 Line Dialer Configuration Options — Multiport Mode 5-19. . . . . . . . . . . . . . . . . . . . . .
5-3 Dial Line Configuration Options — Multiport Mode 5-22. . . . . . . . . . . . . . . . . . . . . . . .
5-4 Leased Line Configuration Options — Multiport Mode 5-25. . . . . . . . . . . . . . . . . . . . . .
5-5 T est Configuration Options — Multiport Mode 5-30. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-6 Miscellaneous Configuration Options — Multiport Mode 5-31. . . . . . . . . . . . . . . . . . . .
5-7 DTE Interface Configuration Options — Singleport Mode 5-37. . . . . . . . . . . . . . . . . . .
5-8 DTE Dialer Configuration Options — Singleport Mode 5-45. . . . . . . . . . . . . . . . . . . . . .
5-9 Line Dialer Configuration Options — Singleport Mode 5-49. . . . . . . . . . . . . . . . . . . . . .
5-10 Dial Line Configuration Options — Singleport Mode 5-53. . . . . . . . . . . . . . . . . . . . . . .
5-11 Leased Line Configuration Options — Singleport Mode 5-57. . . . . . . . . . . . . . . . . . . . .
5-12 V.42/MNP/Buffer Configuration Options — Singleport Mode 5-64. . . . . . . . . . . . . . . . .
5-13 Test Configuration Options — Singleport Mode 5-71. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-14 Miscellaneous Configuration Options — Singleport Mode 5-73. . . . . . . . . . . . . . . . . . .
7-1 Valid Ranges for VF Thresholds 7-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1 Valid Dial Command Modifiers 10-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-1 Edit Password Table Group Options 12-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-2 Set Answer Security Group Options 12-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-3 Set Originate Security Group Options 12-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-4 Security Configuration Options 12-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-5 Security Database Table Using VF-Side Passwords 12-18. . . . . . . . . . . . . . . . . . . . . . . . .
12-6 Security Database Table Using DTE-Side Passwords 12-18. . . . . . . . . . . . . . . . . . . . . . . .
12-7 Security Database Table Using Both VF-Side and DTE-Side Passwords 12-19. . . . . . . . .
14-1 Result Codes 14-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14-2 392xPlus AT Commands 14-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14-3 392xPlus S-Registers 14-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v3920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
Table Page
B-1 Modem Health B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-2 Leased-Line Operation B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-3 Dial Backup Operation B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-4 Modem — DTE Connection B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-5 Modem — VF Connection B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-6 Online Operation B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-7 Misc Operation B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-8 Mux Operation B-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-1 EIA-232-D Pin Assignments C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-2 VF Connector Pin Assignments C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-1 V.25bis Commands D-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-2 V.25bis Response Messages D-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E-1 ASCII Characters E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F-1 Factory Default Configuration Options F-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-1 SDC Negotiation Configuration Scenarios H-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vi October 1998 3920-A2-GH30-40
Preface
Objectives and Reader Assumptions
This manual describes how to install and operate the COMSPHERE Model 3920Plus standalone
and Model 3921Plus carrier-mounted modems. Users of this manual must have a basic
understanding of modems and their operation.
How to Use This Manual
Chapter 1 provides technical specifications, information about the four 392xPlus models, the
modem features, and the government requirements for using these modems.
Chapter 2 provides instructions for installing the 392xPlus modems.
Chapter 3 provides the information required to operate the Model 3920Plus using the diagnostic
control panel and the Model 3921Plus using the COMSPHERE 3000 Series Carrier’s shared
diagnostic control panel (SDCP).
Chapter 4 provides information about the Status branch of the DCP menu.
Chapter 5 provides the information required to set configuration options in the 392xPlus modems
using the modem’s diagnostic control panel.
Chapter 6 provides information about the Poll List branch of the DCP menu.
Chapter 7 provides information about the Control branch of the DCP menu.
Chapter 8 provides information about the T est branch of the DCP menu.
Chapter 9 provides information about the Sub-Network Health and Status branch of the DCP
menu.
Chapter 10 provides information about the Call Setup branch of the DCP menu.
Chapter 11 provides information about the Talk/Data branch of the DCP menu.
Chapter 12 provides instructions for using the Dial Access Security feature.
Chapter 13 provides information about the Remote branch of the DCP menu.
Chapter 14 provides instructions for using AT commands and S-Registers.
Appendix A provides a menu tree for the 392xPlus modems.
Appendix B provides instructions for performing diagnostic tests when data communication
problems occur.
vii3920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
Appendix C provides EIA-232-D and VF TELCO pin assignments.
Appendix D provides V.25bis dialing information.
Appendix E provides an ASCII translation chart.
Appendix F provides a list of all default configuration options available for the factory preset
configurations.
Appendix G provides diagrams of sample configurations for the 392xPlus modems.
Appendix H provides Synchronous Data Compression information.
Appendix I provides an equipment list for the 392xPlus modems.
The Glossary provides a description of terms used throughout this manual.
Related Documents
3000-A2-GA31 COMSPHERE 3000 Series Carrier, Installation Manual
3610-A2-GZ45 3600 Hubbing Device, Feature Number 3600-F3-300, Installation
Instructions
3920-A2-GK40 COMSPHERE 3900 Series Modems, Model 3921Plus, Ferrite Choke,
Installation Instructions
3920-A2-GK41 COMSPHERE 392xPlus Modems, Models 3920Plus and 3921Plus,
Installation Instructions
3920-A2-GK47 COMSPHERE 392xPlus Modems, Model Number 3920-A2-41 1,
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 October 1998 3920-A2-GH30-40
Introduction
Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392xPlus Models 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3920Plus Standalone Singleport Modems 1-2. . . . . . . . . . . . . . . . . . .
Model 3920Plus Standalone Multiport Modem 1-3. . . . . . . . . . . . . . . . . . . .
Model 3921Plus Singleport Carrier-Mounted Modem 1-4. . . . . . . . . . . . . . .
Model 3921Plus Multiport Carrier-Mounted Modem 1-5. . . . . . . . . . . . . . . .
392xPlus Operational Modes 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Modem Features 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Singleport Modem Features 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Multiport Modem Features 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applications 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multipoint 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dual-Leased Backup 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MSD 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Bridge 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.34 Modulation 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiport Backup 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synchronous Data Compression 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Government Requirements and Equipment Return 1-10. . . . . . . . . . . . . . . . . . . .
United States 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canada 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Overview
The COMSPHERE 392xPlus modems are full-feature, high-speed leased modems, providing
reliable asynchronous and synchronous operation over leased- or dial-line networks with data rates
as high as 33,600 bps.
Through downloading capability, any 392xPlus modem is upgradable to the latest firmware,
requiring no new hardware investment or on-site personnel, with little or no downtime (refer to
Chapter 3, DCP Operation, for more information regarding downloading options). The 392xPlus
modems support a wide range of modulation schemes and offer control using either AT commands,
the diagnostic control panel (DCP), or the optional COMSPHERE 6700 and 6800 Series Network
Management Systems (NMS). The NMS performs extensive monitoring, testing, reporting, and
restoral functions to assist in managing your network.
The 392xPlus modems are compatible with a number of dialing methods and protocols, such as
asynchronous AT commands, ITU-T V.25bis dialing, and the DCP. The DCP allows you to use the
392xPlus modem in a variety of applications and environments while also providing control over
modem configuration, dialing, and diagnostics. The 392xPlus modems come with preset factory
configurations that are the most often used modem settings.
1-13920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
COMSPHERE 392xPlus Models
The COMSPHERE 392xPlus modem is available in the following models:
• Model 3920Plus standalone singleport modem (model no. 3920-A1-xxx and 3920-A2-xxx).
• Model 3920Plus standalone multiport modem (model no. 3920-A1-40x).
• Model 3921Plus carrier-mounted singleport modem (model no. 3921-B1-01x).
• Model 3921Plus carrier-mounted multiport modem (model no. 3921-B1-00x).
A reference to 392xPlus modems refers to all 3920Plus and 3921Plus models.
Model 3920Plus Standalone Singleport Modems
The Model 3920Plus singleport (Figures 1-1 and 1-2) is a standalone modem capable of either
4-wire/2-wire leased-line or dial operation. This modem is controlled using either AT commands
or the DCP. The DCP consists of a liquid crystal display (LCD), three function keys, four
directional keys, and a row of 13 LED status indicators. For a better understanding of DCP
operation, refer to Chapter 3, DCP Operation.
DIAGNOSTIC
CONTROL
PANEL
STATUS
INDICATORS
LEASED
DIAL
DTE 1
NMS
LCD AND
KEYPAD
POWER IN
POWER
ON/OFF
POWER
SUPPLY
97-14678-02
1-2 October 1998 3920-A2-GH30-40
Figure 1-1. 3920-A2 Standalone Modem
Model 3920Plus Standalone Multiport Modem
The Model 3920Plus multiport is a standalone modem (Figure 1-2), with an integral time division
multiplexer (TDM) and a modem sharing device (MSD) as standard equipment. The TDM
provides time division multiplexing of up to four independent ports over point-to-point lines using
the V.34 family or V.32 family modulation. The MSD allows multiple physical ports on a tributary
modem to share a single communication channel using the V.34 family, V.32 family, or TMp
modulation. The TDM/MSD multiplexer (commonly referred to as “mux”) can be enabled or
disabled to allow a greater degree of application flexibility.
The 3920Plus multiport modem also operates over a 4-wire/2-wire leased or dial network and is
controlled using the same DCP employed on the Model 3920Plus singleport standalone modem.
Model 3920Plus Singleport and
Multiport Housing
DIAGNOSTIC
CONTROL
PANEL
Chapter Title
SPEAKER
Singleport Modem
Back Panel
DIAL
LEASED
STATUS
INDICATORS
NMS
DTE 1
POWER
ON/OFF
POWER IN
LCD AND
KEYPAD
POWER
CORD
Multiport Modem
Back Panel
DTE 4
DTE 3
DTE 2
DIAL
LEASED
POWER
SUPPLY
POWER
ON/OFF
POWER IN
NMS
DTE 1
496-14684-01
Figure 1-2. 3920-A1 Standalone Singleport and Multiport Modems
1-33920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
Model 3921Plus Singleport Carrier-Mounted Modem
The Model 3921Plus singleport is a carrier-mounted modem (Figure 1-3) capable of either
4-wire/2-wire leased-line or dial operation. The modem installs into a COMSPHERE 3000 Series
Carrier, occupying a single slot. The modem’s faceplate has sixteen (16) LED status indicators for
displaying modem activity and an audio speaker jack for the carrier’s optional speaker .
The modem’s back panel has two edge card connectors that mount into a connector plate. This
connector plate has two DB-25-S connectors, one providing an EIA-232-D DTE interface and one
for future functionality.
FACEPLATE
Status
Pwr
Alrm
142
Test
Dial
125
RI
Busy
Serv
SQ
EIA232/V.24
EDGE CARD
CONNECTOR
103
TXD
104
RXD
105
RTS
106
CTS
107
108
109
DSR
DTR
LSD
FUTURE
USE
BACK
CONNECTOR
PLATE
EIA232/V.24
EIA232/V.24
CONNECTOR
GROUNDING
TAB
Front Panel
(3800)
Spkr
RS366A/V.25
(3600/3500)
V.35
FUTURE
USE
3921Plus
496-14178a-04
Figure 1-3. Model 3921Plus Singleport Modem
1-4 October 1998 3920-A2-GH30-40
Model 3921Plus Multiport Carrier-Mounted Modem
The Model 3921Plus multiport is a carrier-mounted modem (Figure 1-4) equipped with an integral
time division multiplexer (TDM) with a modem sharing device (MSD). The modem installs into
the COMSPHERE 3000 Series Carrier, occupying two slots. The modem’s faceplate covers two
slots in the carrier. It has twenty (20) LED status indicators for displaying modem activity and an
audio speaker jack for the carrier’s optional speaker .
The modem’s back panel has four edge card connectors that mount into two connector plates. Each
connector plate has two DB-25-S connectors providing four EIA-232-DTE interfaces.
Both the singleport and multiport Model 3921Plus modems derive 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 3921Plus modem is through the shared diagnostic
control panel (SDCP), an optional feature which operates in a manner similar to the DCP on the
Model 3920Plus modems. For a better understanding of DCP operation, refer to Chapter 3,
DCP Operation.
FACEPLATE
Introduction
Status
Pwr
Alrm
Test
142
Dial
RI
125
Busy
Serv
SQ
13
Port
24
TXD
103
RXD
104
RTS
105
CTS
106
DSR
107
DTR
108
LSD
109
Front Panel
Spkr
3921Plus
EDGE CARD
CONNECTORS
PORT
PORT
3
PORT
4
1
PORT
2
BACK
CONNECTOR
PLATES
DTE B DTE A
DTE B DTE A
Figure 1-4. Model 3921Plus Multiport Modem
49614423a-03
1-53920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
392xPlus Operational Modes
The 392xPlus operational modes determine how your modem performs in various applications.
These operational modes are determined by your modem model and the selected configuration
options.
There are two operational modes:
• Singleport. Operates on both the singleport and multiport modem models. The Singleport
mode only supports one port (DTE 1). Singleport mode is the only operational mode for the
singleport modem models. For the multiport modem models, Singleport mode is in effect
when the MUX Mode configuration option is set to Disable.
• Multiport. Operates only on the multiport modem models. Multiport mode is in effect when
the MUX Mode configuration option is set to TDM/MSD or DTE_Bridge. It supports from
one to four ports (DTE 1–4), depending on how the modem is configured.
Using T able 1-1, identify your modem’s operational mode based on the 392xPlus modem model
and its selected MUX mode configuration option.
Table 1-1
392xPlus Operational Modes
392xPlus Modem
Singleport n/a Singleport
Multiport MUX Mode: Disabled
MUX Mode Configuration Option Operational Mode
Singleport
MUX Mode set to:TDM/MSD, DTE_Bridge
Multiport
Use the identified operational mode (Singleport or Multiport) to choose the configuration options
that are appropriate for your modem’s application. Refer to Chapter 5, Configure Branch, for
information on configuration options.
1-6 October 1998 3920-A2-GH30-40
392xPlus Modem Features
The 392xPlus modems share a wide variety of features.
• Asynchronous DTE rates of 115.2 kbps and 76.8 kbps.
• Asynchronous data compression and error correction.
• Synchronous data compression.
• Additional VF parameters under the V.32 and V.34 family modulations in 4-wire mode.
• International Support to correctly detect the call progress signals (dial tone, busy, fast busy,
ringback) for a variety of countries.
• Channel adaptive Trellis-Coded Modulation– Paradyne’s advanced Trellis-Coded
transparent forward error correction for Trellis multipoint and high-speed point-to-point
applications.
• Convenient migration to new or optional features through software downloading.
• Extended data circuits with diagnostic capabilities.
• Network management system (NMS) support through the COMSPHERE 6800 or
6700 Series NMS using Advanced Diagnostic protocol (ADp).
Introduction
• Automatic and manual backup with standby capabilities for 4-wire/2-wire leased-line
applications. (The backup facility may be either a 2-wire dial line or a 2-wire leased line.)
392xPlus Singleport Modem Features
Features specific to 392xPlus singleport modems are:
• Four-wire/two-wire leased-line modulations.
• Dial-line modulations.
Refer to Table 1-2 in the Technical Specifications section of this chapter for leased- and dial-line
modulations information.
392xPlus Multiport Modem Features
Features specific to 392xPlus multiport modems are:
• Four-port time division multiplexer (TDM) operation.
• Modem Sharing Device (MSD).
• Digital Bridging.
• Mux enabled, four-wire/two-wire leased-line modulations: V.34 (33,600, 28,800, 24,000,
19,200, 16,800, 14,400, 12,000, 9600, 7200, 4800, and 2400 bps), 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),
and Trellis Multipoint (TMp) (19,200, 14,400, 9600, 7200, 4800, and
2400 bps).
• Mux enabled, dial-line modulations: V.34 (33,600, 28,800, 24,000, 19,200, 16,800, 14,400,
12,000, 9600, 7200, 4800, and 2400 bps), 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).
1-73920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
Applications
Multipoint
Multipoint is available in all 392xPlus modem models. It utilizes leased-line circuits for time
sharing the same front-end processor (FEP) port with multiple remote locations. The FEP (via the
control modem) regulates traffic on the line by continuously polling the tributary DTE(s) in a
predefined sequence. Only one tributary can communicate with the control modem at a given time.
Modems configured for Trellis Multipoint (TMp) cannot be used in a point-to-point, constant
carrier application. (Refer to the Leased Line — Multiport Mode or the Leased Line — Singleport
Mode section in Chapter 5, Configure Branch, for configuration options.)
Dual-Leased Backup
Dual-Leased Backup is available in all 392xPlus modems. It enables a 2-wire leased line to be
used as the backup facility instead of the normal 2-wire dial line. Plug the leased line into the jack
labeled DIAL on the back panel of the modem (see Figure 2-2 in Chapter 2, Modem Installation),
and enable the Dual_Leased_Ln configuration option. (Refer to the Leased Line — Multiport
Mode or the Leased Line — Singleport Mode section in Chapter 5, Configure Branch, for
configuration options.) Except for dialing, ring indication, and call progression functions, you
control the backup function as if it were a normal dial backup.
MSD
Digital Bridging
The Modem Sharing Device (MSD) is only available in 392xPlus multiport modems. It allows
from 2 to 4 physical ports to share a communication channel. When the MUX Mode option is set
to TDM/MSD on a tributary, and at least one port has the MSD mode setting enabled, then MSD is
enabled. For more information, refer to the Multiport Mode section of Chapter 5, Configure
Branch, for configuration options or the Point-to-Point MSD and Multipoint MSD sample
configurations in Appendix G, Sample Configurations.
When MSD mode is enabled:
• The MSD Control configuration option is added at the end of the Mux Sub-Group.
• The EIA Port Sub-group includes the RTS Antistream configuration option.
The Digital (DTE) Bridging application is only available in 392xPlus multiport modems. It
provides the ability for dial backup of a multipoint configuration by bridging the signal on the
digital side of the FEP-end modems. In this configuration, only two ports (both on the FEP side)
are used on the control and backup modems. Data received on Port 1 is transmitted across the
communication link, as well as looped back out of Port 2. Data received across the communication
link and on Port 2 is sent out of Port 1. For more information, refer to the Multiport Mode section
of Chapter 5, Configure Branch, for information on the configuration option (DTE Bridge), or
Appendix G, Sample Configurations, for the Digital Bridging sample configuration.
1-8 October 1998 3920-A2-GH30-40
V.34 Modulation
Introduction
When the Digital Bridging feature is enabled, a new menu is present with the following conditions:
• TDM capability is disabled when DTE Bridge configuration option is set to Enable,
therefore the rate of Port 1 is forced to run at the line rate.
• Configuration options are provided for Port 1 only; Port 2 cannot be configured.
• Ports 3 and 4 are not available.
• Port-related tests, such as digital loopbacks and Pattern tests, are available for Port 1.
• DTE Status, Health and Status, and LED control are available for both Ports 1 and 2.
The V.34 modulation capability is available in all 392xPlus modems. In Singleport mode the V .34
modulation is compatible with other vendors’ modems that support the ITU-T V.34 modulation. In
Multiport mode, the V.34 modulation will not operate at line rates of 31,200, 26,400, and 21,600
bps.
The ITU-T standard for V.34 modulation includes dial- or leased-line operation. For proper
leased-line operation, one modem must be designated as the answer modem while the other
modem must be designated as the originate modem.
The V.34 standard also includes asymmetric rates, automatic adjustment of the transmit power
level, and automatic adjustment of the symbol (baud) rate for optimal data throughput. These
automatic adjustments are made during the training, or modem synchronization, phase via special
line-probing techniques that establish the top-most viable rate of operation. Due to these
techniques, true fixed-rate operation of the modems using V.34 modulation is not possible, since
the line condition may not be capable of supporting the selected rate. Thus, using CT111 and
CT112 for rate control of extended data circuits cannot be used.
When operating in V.34 modulation, you can use the top line of the Quick Configuration screen to
view the current modem transmit rate, the symbol or baud rate, and the transmit level. The
392xPlus modems offer separate options for leased and dial lines to override the asymmetric rate
function, since this can cause problems for certain DTE equipment, Also, each symbol rate
supports a subset of data rates, which make up the whole of the V.34 standard.
Symbol Rate
3429 4800 – 33.6K
3200 4800 – 31.2K
3000 4800 – 28.8K
2800 4800 – 31.2K
2743 4800 – 31.2K
2400 2400 – 24.0K
Supported Data Rates
When using the V.34 modulation on leased lines with a 2-wire leased backup facility, the backup
line check feature, which tests the backup leased lines for connectivity, cannot be used.
1-93920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
Multiport Backup
When the 392xPlus multiport modem has the MUX Mode configuration option set to either
TDM/MSD or DTE Bridge, it is in Multiport mode, and either dial lines or a 2-wire leased line can
be used to back up the primary 4-wire leased line. Backup can be performed automatically upon
loss of the primary leased line, and automatic dial standby also can be used to automatically return
the modems to the primary leased line when restored.
When you use backup functions while in Multiport mode, the modem’s automode feature is forced
to Disable. This ensures that the mux is not accidentally disabled by answering a call, which is
using modulation where Multiport mode is not supported. It is important that both modems
participating in the backup are in Multiport mode with the same dial-line modulation.
NOTE
When a 2400 V.34 modulation connection occurs on one end of a
modem pair with configuration options set for Asymmetric rates, the
other modem is 24K due to the 2400 symbol rate it uses.
Synchronous Data Compression
The 392xPlus standalone and carrier-mounted modems are available with Synchronous Data
Compression (SDC). Refer to Appendix H, Synchronous Data Compression, for more information.
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 3920Plus modem and on the modem’s circuit card assembly on the
Model 3921Plus. 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.
3. An FCC compliant telephone cord and modular plug is 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. See Installation Instructions for
details.
1-10 October 1998 3920-A2-GH30-40
Introduction
4. 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.
5. If the 392xPlus 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.
6. 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 for you to make the necessary modifications in order
to maintain uninterrupted service.
7. The user is not authorized to repair or modify the equipment.
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. 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 Wide 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 of U.S.A., call 1-727-530-2340
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.
1-113920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
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, the user 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.
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 (LN) is labeled on the equipment. The Load Number 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 procedure in the Government Requirements
and Equipment Return section earlier in this chapter.
1-12 October 1998 3920-A2-GH30-40
Technical Specifications
T able 1-2 shows the technical specifications for the 392xPlus modems.
Technical Specifications for 392xPlus Modems
Introduction
Table 1-2
(1 of 2)
Specifications
APPROVALS
Model 3920Plus, 3921Plus, and
COMSPHERE 3000 Series Carrier
ENVIRONMENT
Operating Temperature
Relative Humidity 5% to 90% (noncondensing)
Shock and Vibration Withstands normal shipping
Storage Temperature
DTE INTERFACE
25-pin D-subminiature connector EIA-232-D/ITU–T V.24
MODEL 3920Plus POWER SUPPLY
AC POWER REQUIREMENTS
POWER CONSUMPTION
Model 3920Plus Singleport (3920-A1-xxx) 6 watts (typical, including power supply , speaker off)
Model 3920Plus Singleport (3920-A2-xxx) 8 watts (typical, including power supply , speaker off)
Model 3921Plus Singleport 4 watts (typical, each card) (Speaker consumption is approximately
Model 3920Plus Multiport 8 watts (typical, including power supply, speaker off)
Model 3921Plus Multiport 6 watts (typical, each card) (Speaker consumption is approximately
DIMENSIONS
Weight 2.5 pounds (1.14 kg) Model 3920Plus (without power supply)
Height 2.1 inches (5.4 cm) Model 3920Plus
Width Singleport
Depth 12.1 inches (30.8 cm) Model 3920Plus
TELEPHONE INTERFACE
Leased-Line Connectivity JM8 (Model 3920Plus )
Dial-Line Connectivity RJ11C Permissive
Refer to the product labeling or contact your service representative.
32°F (0°C) to 122°F (50°C)
–4°F (–20°C) to 158°F (70°C)
100 to 250 V ac, 50 to 60 Hz
1 watt at high volume.)
1 watt at high volume.)
1.0 pounds (0.45 kg) Model 3921Plus
7.1 inches (18.1 cm) Model 3921Plus
7.6 inches (19.4 cm) Model 3920Plus
0.9 inches (2.3 cm) Model 3921Plus
Multiport
7.6 inches (19.4 cm) Model 3920Plus
1.8 inches (4.6 cm) Model 3921Plus
13.4 inches (34.0 cm) Model 3921Plus
50-pin mass termination (Model 3921Plus )
RJ21X Permissive 50-pin connector (Model 3921Plus )
Description
1-133920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
Table 1-2
(2 of 2)
Technical Specifications for 392xPlus Modems
Specifications Description
TRANSMIT LEVEL
Leased Line (North America) 0 through –15 dBm (in 1 dBm decrements)
Factory default is 0 dBm
Leased Line (All Other Countries) –1 through –15 dBm (in 1 dBm decrements)
Factory default is country dependent
Dial Line (North America) –10 through –32 dBm (in 1 dBm decrements)
Factory default is Permissive (–9 dBm)
Dial Line (All Other Countries) Level setting is not accessible to the user
Factory default is country dependent
COMPATIBILITY Leased-Line Modulations:
ITU-T V .34 (33,600, 31,200, 28,800, 26,400, 24,000, 21,600, 19,200,
16,800, 14,400, 12,000, 9600, 7200, 4800, 2400 bps)
Paradyne V.32terbo (19,200, 16,800 bps)
ITU-T V.32bis (14,400, 12,000, 9600, 7200, 4800 bps)
ITU-T V.32 (9600, 4800 bps)
Paradyne Trellis Multipoint (19,200, 14,400, 9600, 7200, 4800,
2400 bps)
ITU-T V.22bis (2400 bps)
ITU-T V.27bis (4800, 2400 bps)
ITU-T V.33 (14,400, 12,000 bps)
ITU-T V.29 (9600, 7200, 4800 bps)
Paradyne Point-to-Point Diagnostic (2400 bps)
Dial-Line Modulations:
ITU-T V .34 (33,600, 31,200, 28,800, 26,400, 24,000, 21,600, 19,200,
16,800, 14,400, 12,000, 9600, 7200, 4800, 2400 bps)
Paradyne V.32terbo (19,200, 16,800 bps)
ITU-T V.32bis (14,400, 12,000, 9600, 7200, 4800 bps)
ITU-T V.32 (9600, 4800 bps)
ITU-T V.22bis (2400 bps)
ITU-T V.22 (1200 bps)
ITU-T V.23 (1200, 600 bps)
ITU-T V.21 (300 bps)
Bell 212A (1200 bps)
Bell 103J (300 bps)
Paradyne Point-to-Point Diagnostic (2400 bps)
ERROR CONTROL ITU-T V.42
MNP 4–2
DATA COMPRESSION ITU-T V.42bis
MNP Class 5
V.42t, Paradyne Proprietary Synchronous Data Compression
1-14 October 1998 3920-A2-GH30-40
Overview
Modem Installation
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Modem Package 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer-Supplied Equipment 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3920Plus Modem Installation 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Cables to the Model 3920Plus Modem 2-3. . . . . . . . . . . . . . . . . . . .
Data Terminal Equipment Connection 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Connection (3920-A1-xxx) 2-6. . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Connection (3920-A2-xxx) 2-6. . . . . . . . . . . . . . . . . . . . . . . .
Leased-Line Network Connection 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dial Network Connection 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leased Backup Connection 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dial Backup Connection 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network Management System Connection 2-7. . . . . . . . . . . . . . . . . . . . . . . .
Removing and Replacing the Model 3920Plus Modem 2-8. . . . . . . . . . . . . . . . .
Model 3921Plus Modem Installation 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Model 3921Plus Modem 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Modem Power-Up 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting Factory Configuration Options 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Diagnostic Control Panel (DCP) 2-14. . . . . . . . . . . . . . . . . . . . . . . .
This chapter provides a list of equipment supplied with 392xPlus modems, as well as a list of
customer supplied equipment. In addition, it describes how to install and remove the 392xPlus
modems, and how to select a factory preset configuration using the DCP.
2
392xPlus Modem Package
After opening the modem’s package, check for damage and verify that the following items are
present:
For the standalone models
• Installation instructions
• Model 3920Plus modem
• Power supply with power cord (3920-A1-xxx) or power transformer (3920-A2-xxx)
• One 6-position, 4-wire modular cord (in selected models)
• One 8-position, 8-wire modular cord (in selected models)
2-13920-A2-GH30-41 February 2002
COMSPHERE 392xPlus Modems
For the carrier-mounted models
• Installation instructions
• Model 3921Plus modem
• One (singleport) connector plate or two (multiport) connector plates with two DB-25-S edge
card connectors on each plate
If any hardware components are damaged, notify your service representative. Return equipment
using the procedures described in the Government Requirements and Equipment Return section of
Chapter 1, Introduction.
Customer-Supplied Equipment
The following customer-supplied equipment is required to complete a data communications system
using the Model 3920Plus modem:
• One (singleport) or four (multiport) DTEs with available EIA-232-D serial port(s).
• Standard EIA-232-D cables with one (singleport) or four (multiport) DB-25-P connectors at
one end to attach to the modem.
• One or more of the following modular leased or dial network interfaces:
— JM8 for leased-line configurations.
— RJ11C for dial permissive configurations.
— One 8-position, 8-wire modular cord (for leased backup purposes).
The following customer-supplied equipment is required for the installation of a Model 3921Plus
modem:
• A COMSPHERE 3000 Series Carrier.
• A 50-pin mass termination cable.
• One or more of the following modular or 50-pin leased or dial network interfaces:
— RJ11C for single-line dial permissive configurations.
— RJ21X for multiple-line dial permissive configurations.
— 66 punchdown block.
• 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 configurations).
For installation of the COMSPHERE 3000 Series Carrier into a cabinet, refer to the COMSPHERE
3000 Series Carrier, Installation Manual.
2-2 October 1998 3920-A2-GH30-40
Model 3920Plus 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 back panel of the Model 3920Plus modem (Figure 2-1) has the following switches and
connectors:
• An ON/OFF power switch.
• An 8-pin DIN type power receptacle (PWR) for the dc power supply.
• An 8-pin modular keyed jack (LEASED) for 4-wire/2-wire leased lines.
• An 8-pin modular keyed jack (DIAL) for backup lines (2-wire dial or 2-wire leased).
• A 4-pin modular jack (NMS) for the Network Management System connection.
• One (singleport) or four (multiport) 25-pin DB-25-S receptacles for the DTE interfaces.
Modem Installation
Connecting Cables to the Model 3920Plus Modem
Instructions for connecting cables to the TELCO jack types using the appropriate cables apply to
both singleport and multiport Model 3920Plus modems. Figure 2-1 illustrates the Model 3920Plus
singleport (Model No. 3920-A2-xxx) modem. Figure 2-2 illustrates the Model 3920Plus multiport
modem. For pin assignments, refer to Appendix C, Pin Assignments.
2-33920-A2-GH30-40 October 1998
COMSPHERE 392xPlus Modems
DIAL
LEASED
DTE 1
NMS
PWR ON
OFF
LEASED-LINE
NETWORK
8-POSITION
PLUG
DATA
TERMINAL
EQUIPMENT
DB-25-P
CONNECTOR
SUB-MINIATURE
DIAL NETWORK
6-POSITION PLUG
4-POSITION
PLUG FOR
NETWORK
HUBBING
MANAGEMENT
DEVICE
POWER
SUPPLY
SYSTEM
OPERATION
98-14677-03
Figure 2-1. Model 3920Plus Singleport (3920-A2-xxx) Back Panel and Power Supply
2-4 October 1998 3920-A2-GH30-40
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