Telenetics V.32bis Series, V.34-SDC, 3260, 3261, 3262 User Manual

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TD CD RC/NC

3260

12

Telenetics

326X V.34, V.34-SDC, and V.32bis Series Modem

User’s Guide

Notice

©2001 Telenetics Corporation
25111 Arctic Ocean
Lake Forest, California 92630
[phone]
All rights reserved
Printed in U.S.A.

Restricted Rights Notification for U.S. Government Users

The software (including firmware) addressed in this manual is provided to the U.S.
Government under agreement which grants the government the minimum “restricted rights”
in the software, as defined in the Federal Acquisition Regulation (FAR) or the Defense
Federal Acquisition Regulation Supplement (DFARS), whichever is applicable.

If the software is procured for use by the Department of Defense, the following legend
applies:

Restricted Rights Legend

Use, duplication, or disclosure by the Government

is subject to restrictions as set forth in

subparagraph (c)(1)(ii) of the

Rights in Technical Data and Computer Software

clause at DFARS 252.227-7013.

If the software is procured for use by any U.S. Government entity other than the Department
of Defense, the following notice applies:

Notice

Notwithstanding any other lease or license agreement that may pertain to,
or accompany the delivery of, this computer software, the rights of the
Government regarding its use, reproduction, and disclosure are as set forth
in FAR 52.227-19(C).

Unpublished - rights reserved under the copyright laws of the United States.

Notice (continued)

Proprietary Material

Information and software in this document are proprietary to Telenetics Corporation (or its
Suppliers) and without the express prior permission of an officer of Telenetics Corporation,
may not be copied, reproduced, disclosed to others, published, or used, in whole or in part,
for any purpose other than that for which it is being made available. Use of software
described in this document is subject to the terms and conditions of the Telenetics Software
License Agreement.

This document is for information purposes only and is subject to change without notice.

Radio Frequency Interference Regulations

This equipment has been tested and found to comply 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 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.

Note: the 3262/63/67/68 Modem is a Class A product. In a domestic environment, this prod­uct may cause radio interference, in which case the user may be required to take adequate
measures.

Changes or modifications not expressly approved by Telenetics could void the user's author­ity to operate the equipment.

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.

This is a Class A product. Operation of this equipment in a residential environment may
cause radio interference, in which case the user may be required to take adequate measures to
correct the interference at his/her own expense.

This product is CISPR 22 Class B verified under test conditions that included use of shielded
DTE cables. Ferrite cylinders attached to the dial line are required for Modem 3266 (Can­ada). Leased line cables with 1.5 turns through a ferrite cylinder were also used. Use of dif­ferent cables will invalidate verification and increase the risk of causing interference to radio
and TV reception.

You can obtain the proper cables from Telenetics.

This product is CE marked to indicate compliance with the following European directives.

• 73/23/EEC Low Voltage Directive (Safety)

• 89/336/EEC EEC Directive

Compliance with the above directives may only be assured when the equipment is installed
and operated in accordance with the instructions for its use and the purpose for which it is
intended.

Products that do not bear the CE mark are not intended for supply or use in the European
Union.

Part No. TEL–T0009, Rev A
Publication Code: DS
First Printing: January 2001

Manual is current for Release 8.0 of the 326X Series Modem.

Contents

v

Chapter 1, About the Modem

Introduction .................................................................................................. 1-2

Safety and Operational Notices ................................................................ 1-3

Operating the Modem from the Front Panel ................................................. 1-4

Selecting Programmed Option Sets .............................................................. 1-5

Automatic Calling Interfaces (ACUs) .......................................................... 1-5

AT ACU .................................................................................................... 1-5

V.25bis ACU ............................................................................................. 1-5

LPDA2 ACU ............................................................................................ 1-5

Managing a Modem ...................................................................................... 1-6

Restoring Data Transmission ........................................................................ 1-6

ITU-T V.34 Compliant Modulation Mode .................................................... 1-6

Synchronous Data Compression (SDC) Feature .......................................... 1-7

Automode/Multimode Feature ..................................................................... 1-7

Remote Configuration .................................................................................. 1-8

Error Correction and Data Compression ...................................................... 1-8

Security ......................................................................................................... 1-8

Status Snapshots ........................................................................................... 1-8

Adaptive Rate System ................................................................................... 1-9

Troubleshooting (V.54 and V.22bis Tests) .................................................... 1-9

Country-Specific Information ....................................................................... 1-9

NET Compliance .......................................................................................... 1-9

CE Regulatory Marking Directive (93/68/EEC) .......................................... 1-9

Chapter 2, Installing the Modem

Introduction .................................................................................................. 2-2

Unpacking the Modem ................................................................................. 2-3

Additional Equipment Required ................................................................... 2-4

Choosing a Site ............................................................................................. 2-4

Connecting the Modem ................................................................................ 2-5

Rear Panel Connectors ............................................................................. 2-5

Ferrite Cylinders ....................................................................................... 2-7

Cabling the Modem .................................................................................. 2-11

Connecting the Modem to a Network Management System ................... 2-13

Turning on the Modem ............................................................................. 2-14

Automatic Self-Test ...................................................................................... 2-15

After Installing the Modem... ....................................................................... 2-15

Chapter 3, Getting Started

Introduction .................................................................................................. 3-2

System Requirements for Software Upgrades .............................................. 3-2

Configuring and Operating the Modem ........................................................ 3-2

Using the Front Panel ............................................................................... 3-2

Navigating the Configuration Menu Tree ................................................ 3-5

Setting Configuration Options from the Front Panel ............................... 3-5

vi

Contents (continued)

Using the Modem with a Network Management System (NMS) ............ 3-7

Using the AT Automatic Calling Unit (ACU) .......................................... 3-8

Other Call Establishment Methods ............................................................... 3-10

V.25bis ACU for Sync or Async Applications ......................................... 3-10

NetView LPDA-2 ACU for Sync Applications ........................................ 3-10

Sync Dialing from an IBM AS 400 .......................................................... 3-11

External Auto-Call Units .......................................................................... 3-11

Chapter 4, Configuring the Modem

Overview ....................................................................................................... 4-2

Communications Software Package Operating Notes .................................. 4-2

Configuring the Modem for Use with Communications

Software ............................................................................................... 4-2

Operating Notes ....................................................................................... 4-3

If the Communications Software and Modem Do Not Operate... ............ 4-5

Preparing for Operation ................................................................................ 4-5

Reinitializing Memory from the Front Panel ........................................... 4-5

Reinitializing Memory Using the AT&F Command ................................ 4-5

Configuration Option Sets ............................................................................ 4-6

What is an Option Set? ............................................................................. 4-6

Configuring an Option Set ....................................................................... 4-10

Option Set Defaults .................................................................................. 4-11

326X V.32bis and 326XFA S T Modem Application Examples .................... 4-16

Option Set 1—Async Calls to Central Site Using AT ACU .................... 4-17

Option Set 2—Sync Answering Central Site Without ACU .................... 4-18

Option Set 3—Sync Calls to Central Site, V.25bis ACU ......................... 4-18

Option Set 4—Async Answering Central Site without ACU

(Models 3260/62/65/67) ...................................................................... 4-19

Option Set 4—Synchronous Leased Line Applications with Dial Restoral

(Models 3261/63/66/68) ...................................................................... 4-20

326XFA ST-SDC Modem Application Examples ......................................... 4-21

SDC Pre-Operation Notes ........................................................................ 4-21

Configuring the Modem for SDC Operation ............................................ 4-22

SDC Sample Applications ........................................................................ 4-22

Remote Access Reset ................................................................................... 4-28

Operation .................................................................................................. 4-28

When Remote Access Reset Is Disabled ................................................. 4-28

Chapter 5, Using the AT Automatic Calling Interface

Introduction .................................................................................................. 5-2

What is the Attention (AT) Command Set? .................................................. 5-3

What Role Does Communications Software Play? .................................. 5-3

Using AT Commands .................................................................................... 5-3

Entering AT Command Lines ................................................................... 5-3

Autobaud Feature ..................................................................................... 5-5

vii

Contents (continued)

The Escape Sequence—(+++) ................................................................. 5-5

Non-Configuration AT Commands .......................................................... 5-6

S-Registers ............................................................................................... 5-9

Chapter 6, Troubleshooting Guide

Introduction .................................................................................................. 6-2

Troubleshooting ............................................................................................ 6-2

326X Series Modem Diagnostic Tests .......................................................... 6-10

Synchronous Data Compression (SDC) Testing ...................................... 6-11

Appendix A, Configuration Quick Reference

Configuration Quick-Reference—Menu Trees ............................................ A-2

For More Detail ........................................................................................ A-2

Audience and Assumptions ...................................................................... A-2

Performing Numeric Entry ........................................................................... A-37

S-Register/AT Command Cross-Reference .................................................. A-38

Dial Modifiers for Special Dialing Requirements ........................................ A-39

Result Codes ................................................................................................. A-41

Configuring the Modem’s Dual In-line Package (DIP) Switches ................ A-44

Appendix B, Cabling and Interface Pinouts

Introduction .................................................................................................. B-2

EIA/TIA 232-D (Modem to Computer) Interface ........................................ B-2

ITU Recommendation V.35 Modem-to-Computer Interface ........................ B-4

ITU Rate V.35 Modem-to-Computer Interface Pinouts ........................... B-5

Differences, EIA/TIA 232-D and ITU Rate V.35 Interfaces .................... B-6

DIAL LINE, LEASE (PRIVATE) LINE, PHONE Connector Pinouts ........ B-6

NC (Network Control) Port Pinouts ............................................................. B-7

Cabling ......................................................................................................... B-7

Cable Considerations ............................................................................... B-7

DTE Cable Diagnostics ............................................................................ B-10

Appendix C, Country-Specific Information

Introduction .................................................................................................. C-3

Country Support ....................................................................................... C-3

Installation Notes .......................................................................................... C-4

Restricted Features Summary ....................................................................... C-5

Operating Notes ............................................................................................ C-12

Standalone Modem Rear Panel Views .......................................................... C-12

3260 Dial Only Modem ........................................................................... C-13

3261 Modem Rear View (Leased Line, Dial Restoral) ............................ C-13

viii

Contents (continued)

3265 Dial Only Modem ........................................................................... C-14

3266 Modem (Leased Line with Dial Restoral) ....................................... C-16

Rear Panel Interface Pinouts ......................................................................... C-18

Standalone Models 3260/65 and 3261/66 Interface Pinouts .................... C-18

Card Models 3262/67, 3263/68 Backplane Interface Pinouts .................. C-21

Delayed and Forbidden Lists ........................................................................ C-23

Australia—Delayed Call Lists ................................................................. C-23

Austria—Forbidden Call Lists ................................................................. C-24

Belgium—Delayed Call Lists .................................................................. C-24

Finland—Delayed Call Lists .................................................................... C-25

France—Delayed and Forbidden Call Lists ............................................. C-25

Hong Kong—Delayed Call Lists ............................................................. C-26

Ireland—Delayed Call Lists ..................................................................... C-26

Netherlands—Delayed Call Lists ............................................................. C-27

Norway—Delayed Call Lists ................................................................... C-27

Spain—Delayed Call Lists ....................................................................... C-28

Other Country-Specific Information ............................................................ C-28

Canada .......................................................................................................... C-28

DOC Registration and Requirements ....................................................... C-28

Industry Canada Equipment Attachment Limitations .............................. C-29

Canadian Emissions Statement ................................................................ C-29

Rear Panel Pinouts ................................................................................... C-30

Telco Option (AT&J) ................................................................................ C-31

Denmark—Blind Dialing ............................................................................. C-32

Hong Kong and United Kingdom—BABT Regulations .............................. C-32

Compliance with BS6328: Part 1: 1982 Section 8.3 ................................ C-32

Compliance with BS6328: Part 1: 1982 Section 8.7 ................................ C-32

Compliance with BABTSITS/82/01/C and BABT/SITS/82005S/D ........ C-33

Compliance with BS6305 Clause 6.2, BS6320 Clause 7.2 ...................... C-33

Ringer Equivalence Number (REN) ......................................................... C-33

Compliance with BABT/SITS/83/08/A Clause 1.2 ................................. C-34

Compliance with BS6789: Section 6.1:1986 Clause 5.2 ......................... C-34

Compliance with BS6789: Section 6.1:1986 Clause 7.3.1.3 ................... C-34

Compliance with BS6789: Section 6.1:1986 Clause 7.3.1.4 ................... C-34

Compliance with DTI 83/009I ................................................................. C-35

Compliance with BS6301 ........................................................................ C-35

Compliance with BABT SITS 83/009 Section D ..................................... C-35

Installation of Telephone Socket .................................................................. C-36

Application for Installation of Telephone Socket ......................................... C-36

U. S. A. ......................................................................................................... C-36

FCC Registration ...................................................................................... C-36

FCC Regulations ...................................................................................... C-37

Dial Line Jack Types ................................................................................ C-38

Rear Panel Pinouts ................................................................................... C-39

Dial and Leased Line Transmit Levels ..................................................... C-41

Making Telephone-to-Modem Connections ............................................. C-41

Telco Option (AT&J) ................................................................................ C-42

Declaring The Jack Type .............................................................................. C-42

Using the Modular Nest Backplane’s Busy Out Feature .............................. C-43

ix

Contents (continued)

Glossary

Return Procedures

Equipment Return Procedures ...................................................................... ret-2

Expiration of Lease .................................................................................. ret-2

Factory Repair .......................................................................................... ret-2

Packaging Guidelines for Equipment Return ........................................... ret-2

xi

Using the Documentation Set

Overview

The 326X product documentation set includes the 326X V.34 Series Modem
Reference Card (TEL–T0009-01).

Optionally, with a 326X Series Modem card backplane (to install a 326X card into a
Modular Nest 9 or 21 enclosure), you receive the following:

• 326X Series Modem Cards (Part No. TEL–09949)

Throughout this guide, references to the 326X Series Modem apply to 326X V.32bis,
326X V.34, and 326X-SDC Series Modems, unless stated otherwise.

326X Series Modem Family

The 326X product family consists of three series: V. 3 4 , V. 3 4 SD C , and V. 32b i s .

IMPORTANT: When you select a modulation mode, you must ensure that the Max

Rate (AT*MX) and Min Rate (AT*MN) parameter options are within the valid range
for the mode.

Some 326XFAST-SDC models are available with a V.35-compatible interface. This
unit has a DB25 connector, so a converter is required.

Product Family Model Numbers

Telenetics refers to the product family as 326X because the last digit denotes the
modem model. Model numbers (“X”) are as follows.

This Series...

Supports This
Modulation...

This Maximum
DCE Rate...

And This Maximum
DTE Rate:

326X

FA S T

V.34 ITU V.34 33.6 kbps 128 kbps, asynchronous

326X

FA S T

-SDC ITU V.34 33.6 kbps 128 kbps, asynchronous,

and,

with proprietary compression,
128 kbps synchronous

326X ITU V.32bis 14.4 kbps 57.6 kbps, asynchronous

This Model Number... Denotes:

3260, 3261, 3262, 3263 Models for use in the U.S.A.
3265, 3266, 3267, 3268 Equivalent models, respectively, for international use;

provided in country-specific setups

3260, 3265 Standalone models for:

• Two-wire dial operation

• Two-wire leased-line operation

xii

Using the Documentation Set (continued)

Documentation Target Audience

The documentation set assumes that you are familiar with the basic concepts of data
communications, that you are an operator only, and that you will not be servicing the
modem hardware (other than making initial cabling connections).

Note to Programmers and System Developers

For detailed information on configuration options, equivalent AT Commands, V.25
bis Automatic-Calling Unit, NetView’s LPDA-2 dialing commands, or diagnostic
tests, order the 326X Series Modem Reference Guide (Part No. TEL–09925) by con-
tacting your Telenetics sales representative or local distributor.

How to Use the Documentation Set

Following is a description of the 326X Series Modem documentation set.

326X V.34 Series Modem Reference Card (TEL–T0009-01)

For a quick reference to AT, AT&, and AT* commands, dial modifiers, and
disconnect codes, see the 326X V.34 Series Modem Reference Card. The card also
includes a menu tree of front panel options and AT command settings.

3261, 3266 Standalone models for:

• Two-wire dial operation

• Two- or four-wire leased-line operation

3262, 3267 Rack-mount dual-modem card models, equivalent to 3260

and 3265, respectively, for Modular Nest enclosure installation

3263, 3268 Rack-mount single-modem card models, equivalent to the

3266 for Modular Nest enclosure installation

This Model Number... Denotes:

xiii

Using the Documentation Set (continued)

326X V.34 Series Modem User’s Guide (TEL–T0009)

This User’s Guide provides the information needed to install, configure, and operate
the modem. Chapter outlines are as follows:

Chapter 1, About the Modem, introduces the modem’s features.
Chapter 2, Installing the Modem, explains how to install and cable a modem.

Quick-reference figures showing the connections to make are included.
Chapter 3, Getting Started, discusses how the modem can be used, and

recommends how to configure and operate it. The chapter includes a reference
guide to the rest of the documentation set for further information.

Chapter 4, Configuring the Modem, explains how to effectively configure the
modem. The four preconfigured option sets are described, along with sample
applications that help you choose an option set.

Chapter 5, Using the AT Automatic Calling Interface, discusses the 326X Series
Modem’s AT ACU. This chapter introduces:

• The ACU industry-standard (AT and AT&) commands

• The Telenetics enhanced AT command syntax (AT*).

• The AT commands that are referred to as “action” AT commands (rather than
“configuration” AT commands), and S-Register functions and settings

Chapter 6, Troubleshooting Guide, is a quick reference to problems and
suggestions for correcting them. This chapter assists you in isolating and
correcting a problem before calling Telenetics’ Customer Support Center.

Appendix A, Configuration Quick Reference, provides reference material you
need to change a modem’s default settings. It describes:

— Configuration options with and without AT equivalents
— Result codes (long and short forms)
— S-Registers
— Dial modifiers
— Numeric entry procedure
— The configuration menu structure

Appendix B, Cabling and Interface Pinouts, contains the pinouts for the
modem’s rear panel connectors and associated cables.

Appendix C, Country-Specific Information, discusses the cabling, rear panel
layouts, pinouts and other modem features that are required or restricted by
regulatory agencies for each country.

xiv

Using the Documentation Set (continued)

326X Series Modem Reference Guide (TEL–09925)

Available as an optional order item, the 326X Series Modem Reference Guide is
designed for users who require more detail on operating the modem’s configuration
options and diagnostic self-tests. Contact your Telenetics sales representative or local
distributor for ordering information.

References

Refer to the following documents for more information:

• 326X, 326XFAST, and 326XFAST-SDC Series Modem Product Specification
Sheets

• EIA Application Note #562, Appendix A (defines cable lengths in terms of
DTE rates)

NetView operators should be familiar with:

• NetView Operations Primer (IBM Part No. SC30-3363)

• NetView Operation Scenarios (IBM Part No. SC30-3376)

Trademarks

The following are trademarks or registered trademarks of their respective companies
or organizations:

AT is a command language used with the Smartmodem 1200 and the
Smartmodem 2400/Hayes Microcomputer Products, Inc.

CompuServ / CompuServ Inc.
MNP (Microcom Networking Protocol) and Relay Gold / Microcom, Inc.
NetView and IBM / International Business Machines Corporation
Novell and NetWare / Novell, Inc
Telenet / Sprint International Communications Corporation
Tymnet / British Telecommunications
UNIX / Unix System Laboratories

xv

Using the Documentation Set (continued)

Conventions

The following conventions are used in this manual:

• User entries appear as follows: AT

*

T<CR>

• System messages appear as follows:

NO CARRIER

• A carriage return appears as follows: <CR>. It designates the Return or Enter
key. It is used to complete a text entry or initiate an action from the keyboard.

Special Notices

These notices emphasize certain information in the manual. Each serves a special
purpose and is displayed in the format shown.

IMPORTANT: Important is used to emphasize any significant procedural
information.

Caution

Caution provides information that, if not followed, can result
in damage to software, hardware, or data.

Warning

Warning is the most serious notice, indicating that you can be
physically hurt.

xvi

Using the Documentation Set (continued)

Messages spéciaux

Les messages suivants mettent en valeur certaines informations dans le guide.
Chacun d’eux remplit une fonction spéciale et est affiché dans le format indiqué.

IMPORTANT: Important est utilisé pour souligner des informations critiques au
sujet d’une procédure.

Mise en Garde

Une mise en garde vous fournit des informations qui, si elles
ne sont pas observées, peuvent se traduire par des dommages
pour le logiciel, le matériel ou les données.

Avertissement

Un avertissement constitue le message le plus sérieux,
indiquant que vous pouvez subir des blessures corporelles.

Besondere Hinweise

Durch die folgenden Hinweise werden bestimmte Informationen in diesem Handbuch hervorgehoben. Jeder
Hinweis dient einem bestimmten Zweck und wird im dargestellten Format angezeigt.

WICHTIG: Wichtig wird zur Betonung signifikanter Angaben zu Vorgehensweisen
verwendet.

Vors ich t

Ein Vorsichtshinweis macht Sie darauf aufmerksam, daß
Nichtbefolgung zu Software-, Hardware- oder Datenschäden
führen kann.

Warnung

Eine Warnung weist Sie darauf hin, daß ernsthafte
Körperverletzungsgefahr besteht.

xvii

Using the Documentation Set (continued)

Avisos Especiales

Los siguientes avisos hacen hincapi

é en determinada información de la guía.
Cada uno de ellos tiene un propósito especial y aparecen con el formato
siguiente:

IMPORTANTE: Importante se utiliza para enfatizar cualquier informaci

ón de

procedimiento importante.

Precaucion

La precaución le ofrece información, que de no cumplirse,
puede derivar en posibles daños tanto para el software y el
hardware, como para ambos.

Advertencia!

!

Una advertencia es un aviso importante, que le advierte sobre
la presencia de un inminente peligro.

Telenetics Customer Information

xix

Introduction

U.S.A. customers who have questions about Telenetics products or services should
refer to the following sections. Non-U.S.A. customers should contact their local
Telenetics subsidiary office or distributor.

Questions about Your Product Shipment

If you have questions about whether your shipment is complete or about its condition
upon receipt, please call your nearest Telenetics representative.

Technical Assistance or Scheduling Service

To have Telenetics implement your equipment:
You can purchase and schedule Implementation Services by calling [phone]

(from within the U.S.). The average lead time for implementation services is 5
business days from the time of the call. Implementation services include running
power-up diagnostics, configuring the equipment, and connecting the equipment into
existing networks. A service engineer will be dispatched to your site to perform these
services.

If you implement your equipment yourself:

Carefully follow the instructions in the following sections of this documentation set:

To install and power up — Chapter 2.
To configure and operate — Chapter 3.
If you have difficulty — Chapter 6 provides a quick reference to problems you

may encounter, and suggestions for correcting them.

xx

Telenetics Customer Information

(continued)

For service, if your unit is under warranty and/or you have a service contract:

Call [phone]. When you call, please have the following information ready:

If you do not have a service contract, and your unit is no longer under warranty:

You can purchase a service contract or arrange for Time and Material services by
calling [phone].

Sales-Related Issues

Call your local Telenetics sales office or authorized distributor. For a listing of our
Sales Offices, visit our Web site at: http://www.telenetics.com.

Comments about the Manual

To help us improve our product documentation, please complete and return by mail,
or fax to [phone], the prepaid comment card on the next page. If you prefer,
simply include your name, company, and telephone number and a member of the
documentation group will contact you to discuss any comments you might have.

Item Location or Description

Model number Front of unit. 3260, 3261, 3262, 3263, 3265, 3266, 3267, 3268.

(For synchronous data compression models, specify SDC.)
Serial number Bottom of standalone unit; edge of card unit.
Error message/

Problem Description

LCD Display.

Software revision LCD Display: from [Modulation Mode] 9600 T/D? press to

display the operating status. (Example: DTE 19.2 RELIABL.)

Press until Display Modem ID displays.

Press . SWPart=x displays.

The rightmost two digits show the revision level.
Option Settings Up-to-date configuration worksheet (see the

326X Series Modem

Reference Guide)

.

Site ID Assigned to the customer site by Telenetics at first service call.

Customer should store the ID, once assigned.
Application type Leased line with or without dial restoral or dial. Also specify the

data transfer protocol: asynchronous, direct-synchronous, or

synchronous data compression (SDC) mode.
Connected hardware DTE type(s): asynchronous or synchronous terminal or PC.

About the Modem 1-1

About the

Modem

Chapter 1

About the Modem

Contents

Introduction .................................................................................................. 1-2

Safety and Operational Notices ................................................................ 1-3

Operating the Modem from the Front Panel ................................................. 1-4

Selecting Programmed Option Sets .............................................................. 1-5

Automatic Calling Interfaces (ACUs) .......................................................... 1-5

AT ACU .................................................................................................... 1-5

V.25bis ACU ............................................................................................. 1-5

LPDA2 ACU ............................................................................................ 1-5

Managing a Modem ...................................................................................... 1-6

Restoring Data Transmission ........................................................................ 1-6

ITU-T V.34 Compliant Modulation Mode .................................................... 1-6

Synchronous Data Compression (SDC) Feature .......................................... 1-7

Automode/Multimode Feature ..................................................................... 1-7

Remote Configuration .................................................................................. 1-8

Error Correction and Data Compression ...................................................... 1-8

Security ......................................................................................................... 1-8

Status Snapshots ........................................................................................... 1-8

Adaptive Rate System ................................................................................... 1-9

Troubleshooting (V.54 and V.22bis Tests) .................................................... 1-9

Country-Specific Information ....................................................................... 1-9

NET Compliance .......................................................................................... 1-9

CE Regulatory Marking Directive (93/68/EEC) .......................................... 1-9

1-2 About the Modem

About the

Modem

Introduction

This chapter summarizes the features and options of the 326X Series Modem. The
series includes:

• The 326X V.32bis Series Modem, which operates in V.32bis modulation mode

• The 326XFA S T Series Modem, which can operate in V.34 modulation mode

• The 326XFA S T-SDC Series Modem, which can operate in V.34 modulation
mode and the Synchronous Data Compression mode

In this guide, references to the modem apply to all of the above, unless stated
otherwise.

IMPORTANT: When you select a modulation mode, you must ensure that the Max
Rate (AT*MX) and Min Rate (AT*MN) parameter options are within the valid range
for the mode.

The modem provides reliable data communication over 2-wire dial lines and 2-wire
or 4-wire leased lines, depending on the model. Dial lines are public lines to which
all telephone users have access; leased lines, also called private lines, provide a
dedicated connection, over lines provided by the telephone company.

Whether you use dial or leased lines, you can operate the modem as follows:

• Using the front panel: control keys and liquid-crystal display (LCD)

• Using industry-standard (AT and AT&), and Telenetics-enhanced (AT

*

) AT
commands from an attached terminal, or commands from an asynchronous
communications software package running on an attached PC

•From a network management system (NMS)

• Using call establishment methods, such as V.25bis or LPDA2 automatic call
units (ACUs)

Figure 1-1 shows desktop, or standalone, modems. The device is also available in
high-density nest cards, which offer the same features, and can be installed in Tele-
netics’s Modular Nest 9-slot and Modular Nest 21-slot rack-mounted enclosures.

About the Modem 1-3

About the

Modem

Figure 1-1. 326X Series Modem, Standalone Desktop Model

Safety and Operational Notices

Repair

Warning

Do not attempt to repair the modem or enclosure. They contain no
electronic components that can be serviced or replaced by a user.
Any attempt at user service of the 326X enclosure, or opening of
the 326X unit, voids the product warranty.

Avertissement

N’essayez pas de réparer le modem ou le boîtier. Ils ne contiennent
aucun composant électronique pouvant êtreréparé ou remplacé par
un usager. Toute tentative de réparation du boîtier du 326X par un
usager, ou toute intervention à l’intérieur du 326X, annule la garan­tie du produit.

Warnung

Versuchen Sie nicht, das Modem oder sein Gehäuse zu reparieren.
Es sind keine durch den Benutzer wartungs- oder austauschfähige
Teile darin enthalten. Bei jeglichem Öffnen oder Wartungsversuch
am 326X bzw.

RD TR RI/OH

TD CD RC/NC

3260

1-4 About the Modem

About the

Modem

Lightning

Warning

All Telenetics devices should be used in environments designed for
computers and electronic equipment. In areas susceptible to
lightning, take precautions to prevent damage to electronic
equipment. Contact your telephone company, or an electronic
accessories vendor, for information on lightning protection
equipment. Customers experiencing problems caused by surges
from lightning have eliminated such problems by installing
appropriate surge suppressors on power and data lines connected to
Telenetics devices.

Avertissement

Tous les dispositifs Telenetics doivent être utilisés dans des
environnements conçus pour des ordinateurs et du matériel
électronique. Dans les zones susceptibles d’être frappées par la
foudre, prenez des précautions pour éviter que le matériel
électronique soit endommagé. Contactez votre compagnie
téléphonique, ou un vendeur d’accessoires électroniques, pour
obtenir des renseignements concernant les systèmes de protection
contre la foudre. Certains usagers confrontés à des problèmes
causés par des sautes de tension dues à la foudre ont éliminé ces
problèmes en installant des régulateurs de tension appropriés sur
les câbles électriques et les câbles de données reliés aux dispositifs
Telenetics.

Warnung

Telenetics-Geräte sind grundsätzlich in für Rechner und
elektronische Anlagen vorgesehenen Umgebungen zu verwenden.
In unwettergefährdeten Bereichen ist jegliche Elektronik gegen
Blitzeinwirkung zu schützen. Näheres über entsprechende
Schutzeinrichtungen erfahren Sie von Ihrer Telefongesellschaft
oder einem Elektrohändler. Probleme mit Spannungsstößen durch
Blitzeinwirkung lassen sich durch Einbau von
Überspannungsableitern in die zu Telenetics-Geräten führenden
Netz- und Datenleitungen beheben.

Operating the Modem from the Front Panel

The front panel menus are organized functionally so that operation is easy for novice
and advanced users.

Refer to Chapter 3, Getting Started, to learn about front panel operation.

About the Modem 1-5

About the

Modem

Selecting Programmed Option Sets

Option sets make it easy to use a modem with common applications, including:

• Asynchronous and synchronous answering

• Asynchronous and synchronous dialing

• Leased line with dial restoral operation

Four sets of options are stored in nonvolatile memory. If none is appropriate to an
application, you can customize an option set, and save it in nonvolatile memory.

Refer to Chapter 4, Configuring the Modem, for more information on option sets.

Automatic Calling Interfaces (ACUs)

The modem supports three automatic calling interfaces (also known as Auto-Call
Units). ACUs let you execute functions directly from a keyboard.

AT AC U

The asynchronous AT AC U is compatible with the industry-standard AT command
set. AT Commands provide a standard modem communications interface, allowing
you to configure and operate your modem from a terminal or PC keyboard.

Using the AT-compatible command set (AT and AT&), you can, for example, dial
and receive phone calls. Telenetics’ extended AT command set (AT

*

) includes other

important parameters used in configuring advanced modem features.

Refer to Chapter 3, Getting Started, and Chapter 5, Using the AT Automatic Calling
Interface, to learn more about the AT ACU and AT command syntax.

V.25bis ACU

For sync or async auto-calling, use the ITU-T V.25bis compliant ACU.

With either the AT or V.25bis ACU, you can store, dial, or change up to nine phone
numbers in the modem's electronic telephone book, directly from your terminal.

Refer to Chapter 3, Automatic Calling Interfaces, in the 326X Series Modem
Reference Guide, for details.

LPDA2 ACU

The LPDA2 feature lets you use IBM dial and leased line restoral applications with
LPDA2 Dial and Disconnect commands. LPDA2 allows Netview and other IBM
applications, like POS outbound dialing applications, to control dialing.

In dial applications, LPDA2 eliminates the need for additional ports and equipment
that had been required to support external 801 auto-dialing equipment in IBM
environments.

1-6 About the Modem

About the

Modem

In leased line operation, while connected on the dial line, the modem can monitor for
LPDA2 commands in the data stream. If the local modem detects an LPDA2
command, the frame that is being processed is aborted. This prevents the remote
DTE from processing the command frame as valid data.

Refer to Chapter 3, Automatic Calling Interfaces, in the 326X Series Modem
Reference Guide, for details.

Managing a Modem

Integral Network Management by Telenetics’ 9110, 9000-UX, and 9000-PC
Network Management Systems (NMS) is standard. The NMS can configure,
monitor, and control local and remote modem operation.

An NMS continuously polls modems to collect management information and check
status. Network management traffic, including alarms, commands, events, and
polling, is transported to remote modems on an in-band channel that does not disrupt
user data traffic nor consume user bandwidth. The modem supports a daisy-chain
network management interface, reducing the hardware required for connections.

Refer to Chapter 2, Installing the Modem, for instructions on installing and cabling a
modem for use with Telenetics’ Network Management Systems.

Restoring Data Transmission

For critical leased line applications that require backup, you can use Models 3261,
3263, 3266, or 3268 in a point-to-point configuration. If the leased line fails, these
modems can automatically reroute data traffic through the public switched telephone
network (PSTN) over a 2-wire dial line. This integral dial line restoral feature
guarantees that data will keep flowing, minimizing network downtime.

ITU-T V.34 Compliant Modulation Mode

326XFA S T and 326XFA S T-SDC modems support the ITU-T V.34 compliant
modulation mode. 326XFA ST- SDC modems offer the same broad set of features

available in the 326XFA S T modems, and let you take advantage of faster
transmission speeds while providing highly reliable data transmission in full-duplex
synchronous environments.

326XFA S T modems have a line probing feature that optimizes performance on every
connection by automatically choosing the optimum bandwidth, carrier frequency,
and data rate.

About the Modem 1-7

About the

Modem

V.34 Modulation Mode Characteristics

V.34 modulation mode characteristics are as follows.

Data Rate: 2.4, 4.8, 7.2, 9.6, 12.0, 14.4, 16.8, 19.2, 21.6, 24.0, 26.4, 28.8, 31.2, and

33.6 kbps

Baud Rate: 2400, 2743, 3000, 3200, and 3429. Some baud rates do not support all
data rates.

Carrier Frequency: 1600, 1646, 1800, 1829, 1920, 1959, and 2000 Hz. Some baud
rates do not support all carrier frequencies.

Modulation: V.34 is a four-dimensional trellis-coded modulation standard that uses
precoding and pre-emphasis equalization schemes.

Compatibility in V.34 Modulation Mode

326XFA S T Series Modems (operating in V.34 Auto modulation mode), are
compatible with modems that do not support the V.34 modulation mode, by
automatically negotiating the highest common modulation mode (e.g., V.32bis).

V.90 Compatibility: Release 8.1 software enables 326X modems to operate with
V.90 modems in dial-up connections. With this software, 326X modems can
communicate with V.90 modems and negotiate V.34 rates. The release does not
provide 56kbps rates for 326X modems, nor 326X rates higher than the V.34 33.6
kbps standard. An upgrade to 8.1 is not required for modems used only in leased-line
applications.

Synchronous Data Compression (SDC) Feature

The 326XFA S T Series Modem is available in a synchronous data compression
(SDC) model. 326XFA S T products offer all the features of the 326XFA S T family,
plus synchronous DTE rates at 72.0 kbps or higher.

The 326XFA S T-SDC Modem is an ideal alternative to costly digital services.
Whether your application requires dedicated bandwidth, bandwidth on demand,
synchronous dial-up, or dial backup, the 326X-SDC provides optimum throughput
for all HDLC/SDLC-like environments, such as X.25, Systems Networking
Architecture (SNA), Statistical Multiplexer, and Router networks.

Refer to Chapter 4, Configuring the Modem, for details.

The synchronous data compression feature in the 326XFA ST-SDC Modem is Tele­netics’ proprietary technology.

Automode/Multimode Feature

Using Automode/Multimode, the modem can automatically negotiate the highest
common modulation speed (within a modulation mode) with another modem.

1-8 About the Modem

About the

Modem

Remote Configuration

Using the local front panel, an NMS, or local-modem AT ACU, you can configure a
remote modem. You can also read the remote modem's status snapshots and receive

its configuration summary on a front panel or async terminal.

Error Correction and Data Compression

The modem provides error correction and data compression in accordance with
the V.42 and V.42bis ITU-TS recommendation. With V.42, modems automatically
determine whether to use Microcom Networking Protocol (MNP) Level 4 or Link
Access Procedure for Modems (LAPM) for error correction. Depending on the
scheme negotiated, the modem uses MNP Level 5 or V.42bis data compression. The
SDC modem uses LAPM with Telenetics’ proprietary data compression technology.

Security

The modem provides access security at two levels:

• Front panel

• Modem access

Front panel security lets you password-protect a modem from access by other users.
This prevents unauthorized changes from being made to a configuration. Front panel
security does not prevent you from using the modem.

You can also screen incoming calls so that unauthorized users cannot access a
modem. This is accomplished with password and callback functions.

Appendix A explains how to configure security features.

Status Snapshots

The modem’s status snapshot feature lets you view a local or remotely controlled
modem's EIA signals and Telenetics circuit quality monitoring system (CQMS)
parameters, and view a configuration summary.

CQMS parameters continuously estimate major line parameters without disrupting
data traffic. Measurement of such selections as signal-to-noise ratio and receive level
helps you to isolate causes of degraded network performance.

About the Modem 1-9

About the

Modem

Adaptive Rate System

With the Adaptive Rate System enabled, the 326X Series Modem continuously
optimizes its transmit speed within the V.34, V.32bis, V.32 (coded and uncoded),
and V.22bis modulation modes. By constantly monitoring signal quality, the modem
adapts to the optimum transmission rate allowed by line conditions, ensuring
maximum throughput and efficiency.

Troubleshooting (V.54 and V.22bis Tests)

The modem supports a full range of ITU-TS V.54 and V.22bis compatible tests to
help isolate and correct problems.

Refer to Chapter 6 for typical problems and ways to correct them. Chapter 6 also
lists the supported diagnostic tests, and instructions for initiating and terminating
tests using either the front panel control keys or AT commands.

For details on tests, refer to Chapter 4 of the 326X Series Modem Reference Guide.

Country-Specific Information

Telephone company regulations vary by country. Because of this, there are minor
physical or operational differences among 326X Series Modem models.

Appendix C, Country-Specific Information, provides cabling, rear panel layouts,
interface pinouts, and other modem features that are required or restricted by country
regulatory agencies.

NET Compliance

This release of the 326X Series Modem complies with the European
Telecommunication Standards Institute’s (ETSI) Net 20, 21, 22, 23, and 25.

CE Regulatory Marking Directive (93/68/EEC)

This product is CE marked to indicate compliance with the following European
directives:

• 73/23/EEC Low Voltage Directive (Safety)

• 89/336/EEX EMC Directive
Compliance with the above directives may only be assured when the equipment is

installed and operated in accordance with the instructions for its use and the purpose
for which it is intended.

Products that do not bear the CE mark are not intended for supply or use in the
European Union.

Installing the Modem 2-1

Installing

the Modem

Chapter 2

Installing the Modem

Contents

Introduction .................................................................................................. 2-2

Unpacking the Modem ................................................................................. 2-3

Additional Equipment Required ................................................................... 2-4

Choosing a Site ............................................................................................. 2-4

Connecting the Modem ................................................................................ 2-5

Rear Panel Connectors ............................................................................. 2-5

Ferrite Cylinders ....................................................................................... 2-7

Cabling the Modem .................................................................................. 2-11

Connecting the Modem to a Network Management System ................... 2-13

Turning on the Modem ............................................................................. 2-14

Automatic Self-Test ...................................................................................... 2-15

After Installing the Modem... ....................................................................... 2-15

2-2 Installing the Modem

Installing

the Modem

Introduction

This chapter describes how to install and connect a 326X Series Modem. In this
chapter, you:

• Unpack the modem

• Choose an appropriate site to install the modem

• Familiarize yourself with the modem’s rear panel and connectors

• Connect the modem to a PC or other data terminal equipment (DTE)

• Connect the modem to a telephone handset (if appropriate) and to the
dial/leased telephone line jacks

• Attach ferrite cylinders, if necessary

• Connect the modem to a Network Management System (NMS), if appropriate

• Turn on the modem and run the unit’s automatic self-test

IMPORTANT: Telephone company and governmental regulations vary by country.
Your modem’s rear panel layout and cabling may vary from that shown in this guide.

Refer to Appendix C for a description of the modem rear panel and cabling;
important safety guidelines for connecting the modem in your country; and
regulatory restrictions and requirements.

To order cables, refer to Appendix B; then contact your Telenetics sales
representative or local distributor for ordering information.

NOTE: If you are installing a 326X Series Modem card, refer to the addendum,
326X Series Modem Cards, shipped with your modem’s backplane.

Appendix C

Appendix B

Installing the Modem 2-3

Installing

the Modem

Unpacking the Modem

The modem is wrapped in reusable shock-absorbent packing material. Save the
carton and packing material for later reuse. Telenetics supplies the items shown in
Figure 2-1 with the modem.

Figure 2-1. Unpacking the Modem

If the equipment is damaged, contact the shipper. If you have further concerns about
damage or missing parts, contact your nearest Telenetics representative, or:

In the U.S.A.: Outside the U.S.A.:

Telenetics Customer Support
25111 Arctic Ocean
Lake Forest, CA 92630

The nearest Telenetics distributor can be found
by accessing our Web site at:
http://www.telenetics.com

[phone]

One

User’s Guide

One

Reference Card

One 326X Series Modem

(Standalone Unit Shown)

One Power Cord

One or Two Modular Audio Cables
(3260, 3265: One; Others, Two)

2-4 Installing the Modem

Installing

the Modem

Additional Equipment Required

In addition to the items supplied with the modem, you may need the following:

• Communications Software Package
Many modem applications are controlled by communications software that

supports serial communications. When connecting a modem to a terminal,
communications software is unnecessary. (Refer to Chapter 3 and Chapter 4 for
more information.)

• Serial Cable
A shielded, straight-through modem-to-terminal cable, data communications

equipment (DCE) to data terminal equipment (DTE) cable, is required.
The cable must have a 25-pin D male connector and a DTE connector.

For modem-to-modem (or other DCE-DCE connection), use a crossover cable.
The cable must support the modem signaling your application requires. Select a

cable based on your computer and the DTE pin assignments in Appendix B.

Choosing a Site

Where you place the modem can affect its operation. To enhance performance:

• Install the modem in a clean, well-lighted area that is free from temperature
extremes and dust.

• Do not place anything on top of a modem.

• Locate the modem no more than the EIA-recommended distance from a DTE
and within 6 feet (1.83m) of a grounded AC power outlet.

• Do not place anything within 1 inch (2.54 cm) of either side of a modem. Also,
to prevent overheating, do not place a modem on its side.

Refer to Appendix C for site requirements for operating the modem in your country.

Modem-to-Terminal Cable

Asynchronous or Synchronous

Terminal (DTE)

Personal Computer with Communications

Software Package

Appendix B

Appendix C

Installing the Modem 2-5

Installing

the Modem

Connecting the Modem

Rear Panel Connectors

Figures 2-2 and 2-3 show 3260/3265 and 3261/3266 standalone modem rear panels.
The rear of the modem has the following connectors:

• Modular jacks for making:

— DIAL LINE and PHONE connections (3260/3265 Modems) or
— DIAL LINE, PHONE, and LEASE LINE connections (3261/3266

Modems)

•One 6-position Dual Inline Package (DIP) switch. This switch “hard-
configures” some operating functions. When the modem is shipped from the
factory, all switches are in the Off (up) position. DIP switch selections cannot
be overridden by remote front panel configuration. Refer to Appendix C for
DIP switch function details.

• Network Control (NC) IN and OUT ports for connecting to Telenetics’
Network Management Systems (NMS)

•A DTE port for connecting to a PC or DTE

•An AC power receptacle to accept an AC line cord

•An AC power switch

Refer to Appendix C for a description of the modem’s rear panel. For information on
326X Series Modem Card backplanes (models 3262, 3263, 3267, and 3268), refer to
the addendum, 326X Series Modem Cards, shipped with your backplane.

Figure 2-2. 3260/3265 Modem Rear Panel Layout

Appendix C

PHONE

DIAL
LINE

OUT IN

NC

DTE

1 ON 6

Factory Preset 6-Position

DIPs are Off (Up)

1 2 3 4 5 6

123456

2-6 Installing the Modem

Installing

the Modem

Figure 2-3. 3261/3266 Modem Rear Panel Layout

Electrical Interfaces—EIA/TIA-232 and ITU-TS V.35

Caution

Ensure that the electrical interfaces of the equipment you connect
to the modem are compatible. Incompatible interfaces may
seriously damage the modem. Telenetics makes no guarantee of the
equipment’s integrity if you do not ensure that compatible
interfaces are used. If your DTE has a different interface, you will
need an external converter cable.

326X Series Modems have an EIA/TIA-232/EIA/TIA-562 electrical interface for
connection to external equipment. For compatibility with DTEs that have a V.35
interface, the V.34-SDC Modem is also available with the optional ITU-TS V.35
Recommendation electrical interface.

The rear-panel DTE port is configured at the factory for either interface. Both
interfaces are not available in a unit. Regardless of the interface, external DTEs are
connected through the modem’s rear-panel DTE port.

NOTE: When operating with the V.35 interface, DIP switch S1 must be set to the off
(up) position (see Figure 2-2 or 2-3).

To purchase a compatible cable, consult Appendi xB.

Operating at V.34 DTE Rates

To operate V.34 or V.34-SDC modems at DTE rates greater than 19.2 kbps, you must
use cables that can handle the higher data rates. Refer to Appendix B for instructions
on determining the correct cables to use.

PHONE

DIAL
LINE

OUT IN

NC

DTE

1 ON 6

1 2 3 4 5 6

123456

LEASE

LINE

Factory Preset 6-Position

DIPs are Off (Up)

Appendix B

Installing the Modem 2-7

Installing

the Modem

Ferrite Cylinders

Ferrite cylinders or beads installed on cables filter out line disturbances. They are
required on some 326X models in some countries, as described in this section.

Caution

Install cables with the ferrite end adjacent to the modem.
The ferrite cylinder ensures that the unit operates in compliance
with FCC RFI requirements.

Models 3261 and 3266 – Dial Line Connections

Two telephone cables with ferrite cylinders are included in the Model 3261
(U.S.A.) and the 3266 (Canada, Germany, U.K., and Japan) accessory kit.
Connect the cables from the modem to 6- or 8-conductor dial-line connections.

Install the telephone cable. Figure 2-4 shows the proper orientation. Figure 2-8, in
the next section, shows how to connect the 3261/3266 modem.

Figure 2-4. Attaching Ferrite Cable to the Modem

Models 3267 and 3268

Ferrite cylinders are required on:

• Both dial line cables and on DTE cables on the 3267 V.34 Modem

• Both audio (leased or dial) cables and on DTE cables on the 3268 V.34

Modem

• Power cables on Modular Nest enclosures populated with 3267 and 3268 V.34
Modems

• Network management cables on Modular Nest enclosures populated with
3267 and 3268 V.34 Modems

A cylinder is included with each cable that requires one. Follow the instructions
below to ensure correct cylinder installation.

Ferrite

Dial Line Cable

To Wall Jack

2-8 Installing the Modem

Installing

the Modem

Installing a Ferrite Cylinder on an Audio or Network Management Cable

Do the following for each cable:

1) Snugly wrap the cable twice completely around the cylinder (Figure 2-5).

2) Set the cable into the cylinder cutouts.

3) Ensure that 1 to 1-1⁄2 inches of the cable protrude from the cylinder (on the
end you insert into the backplane connector).

4) Snap the cylinder closed. You can reopen and close it to reset the cable.

5) Insert the cable into the modem backplane connector (with the ferrite cylinder
close to the backplane connector).

Figure 2-5. Installing a Ferrite Cylinder on an Audio Cable

Installing a Ferrite Cylinder on a DTE Cable

Do the following for each DTE cable:

1) Pass the DTE cable through the cylinder.

2) Set the cable into the cylinder cutouts.

3) Position the cylinder as close as possible to the plug you install on the back­plane connector.

4) Snap the cylinder closed. You can reopen and close it to reset the cable.

5) Insert the cable into the DTE connector on the modem backplane connector,
with the ferrite cylinder close to the backplane connector.

Cable Looped Twice

Around Cylinder

Ferrite Cylinder

Cutout

Audio Cable

To Conne c t or O n

Modem Rear Panel

To Line Jack

1

2

11"- / "

Installing the Modem 2-9

Installing

the Modem

Installing a Ferrite Cylinder on a Power Cable

Do the following for each power cable of a Modular Nest enclosure populated with
3267 and 3268 V.34 Modems .

1) Snugly wrap the cable once completely around the cylinder (Figure 2-6).

2) Set the cable into the cylinder cutouts.

3) Ensure that 1 to 1-1/2 inches of the cable protrude from the cylinder (on the
end you insert into the backplane connector).

4) Snap the cylinder closed. You can reopen and close it to reset the cable.

5) Insert the cable into the Modular Nest enclosure connector (with the ferrite
cylinder close to the connector).

Figure 2-6. Installing a Ferrite Cylinder on a Power Cable

Cable Looped Once

Around Cylinder

Ferrite Cylinder

Cutout

Power Cable

1

2

11"-/"

To Modular Nest Enclosure Connector

To Power Jack

2-10 Installing the Modem

Installing

the Modem

Important Information About the Modular Nest Enclosure Front Door

Warning

For safety, the enclosure front door should remain closed and locked
at all times unless you are installing, removing, or configuring
product cards.

Avertissement

Pour des raisons de sécurité, la porte d’entrée doit être toujours
fermée et verrouillée, sauf lorsque vous installez, retirez ou
configurez des cartes.

Warnung

Aus Sicherheitsgründen darf die Klappe auf der Vorderseite nur zum
Installieren, Entfernen oder Konfigurieren von Produktkarten
entriegelt und geöffnet werden.

Por razones de seguridad, la puerta frontal deberá permanecer
cerrada en todo momento, a menos que se proceda a la instalación,
extracción o configuración de las tarjetas del producto.

Important Information About the Modular Nest Enclosure

This notice applies to cooling airflow around the Modular Nest unit.

Caution

Failure to properly arrange cables could impede cooling airflow,
possibly resulting in damage to the equipment

Mise en Garde

Un mauvais agencement des câbles risque d’empêcher une bonne
ventilation et par conséquent de causer des dommages matériels.

Vors ich t

Die inkorrekte Anordnung von Kabeln kann den Kühlluftstrom
behindern und zu Geräteschäden führen.

Precaucion!

!

La disposición defectuosa de los cables puede impedir el flujo de
aire frío, resultando en posibles daños para el equipo.

Installing the Modem 2-11

Installing

the Modem

Cabling the Modem

This section explains how to connect the modem to:

1) A PC or DTE (asynchronous or synchronous terminal)

2) A dial telephone line

3) A telephone cable (between handset and modem)

4) A leased telephone line (if appropriate)

5) The power cord

6) Network management system cables (if appropriate)

For models 3260/3265, connect modem cables in the order shown in Figure 2-7.

For models 3261/3266, connect modem cables in the order shown in Figure 2-8.

Warning

The modem must be grounded through its electrical plug. If you
cannot use the safety plug with your electrical outlet, consult a
licensed electrician to ensure that the modem is properly grounded.
Unplug the modem from the power outlet before having it serviced.

Avertissement

Le modem doit être mis à la terre lors de son branchement. Si vous
n'avez pas de cartouche fusible, consultez un électricien pour assurer
la mise à terre adéquate de votre appareil. Mettez-le hors tension
avant de commencer toute réparation.

Warnung

Das Modem wird normalerweise über den Stecker geerdet. Wenn
Sie den Schuko-Stecker nicht an die Steckdose anschließen können,
wenden Sie sich an einen zugelassenen Elektriker, um
sicherzustellen, daß das Gerät korrekt geerdet ist. Trennen Sie das
Gerät vor dem Öffnen des Gehäuses vom Netz.

2-12 Installing the Modem

Installing

the Modem

Figure 2-7. 3260/3265 Modem Cabling

Figure 2-8. 3261/3266 Modem Cabling

AC

Outlet

Dial/

Leased

Line
Jack

3

Telephone

Cable

Power

Cord

EIA/TIA 232-D

Interface Cable

Dial/

Leased

Telephone

Line

1

2

4

Step 1: Install ferrite cylinders as explained in this chapter.
Step 2: Install an EIA/TIA 232-D cable between the modem's DTE connector and the

DTE or PC serial port. Tighten the cable-connector retaining screws.

Step 3: Unplug the telephone cord from the wall jack and plug it into the modem’s

PHONE LINE connector

Step 4: Attach the modular audio cable (provided with the modem) to the modem’s DIAL

LINE connector. Connect the cable to the RJ-11 dial line wall jack.

Step 5: Plug the power cable into the modem, and then plug into an outlet.
IMPORTANT:

Transmit levels on a leased line are typically much greater than those on
a dial line. Do not connect a modem to the dial network when the modem is
configured for leased line operation; the telephone company may detect a fault
condition and initiate an incorrect service call.

2

AC

Outlet

Dial

Telephone

Line

Dial
Line
Jack

Leased

Line
Jack

Leased

Telephone

Line

4

Telephone

Cable

Power

Cord

EIA/TIA 232-D
Interface Cable

1

3

5

Step 1: Install ferrite cylinders as explained in this chapter.
Step 2: Install an EIA/TIA 232-D cable between the modem's DTE connector and the DTE

or PC's serial port. Tighten the cable-connector retaining screws.

Step 3: Unplug the telephone cord from the wall jack and plug it into the modem’s PHONE

LINE connector.

Step 4: Attach the modular audio cable (provided with the modem) to the modem’s DIAL

LINE connector. Connect the cable to the RJ-11 dial line wall jack.

Step 5: Attach another modular audio cable (provided with the modem) to the modem’s

LEASE LINE connector. Connect the cable to the leased line wall jack.

IMPORTANT:

Transmit levels on a leased line are typically much greater than those on a
dial line. Do not connect a modem to the dial network when the modem is config­ured for leased line operation; the telephone company may detect a fault condition
and initiate an incorrect service call.

Step 6: Plug the power cable into the modem, and then into an outlet.

Installing the Modem 2-13

Installing

the Modem

Connecting the Modem to a Network Management System

326X Series Modems can be connected to the following Telenetics systems:

• 9110 NMS (Figure 2-9)

• 9000-PC (Figure 2-10)

• 9000-UX(Figure 2-10)

Use the modem’s NC IN and NC OUT 8-pin DIN connectors for NMS connections.

Figure 2-9. Connecting to a 9110 NMS

Figure 2-10. Connecting to a 9000-PC or 9000-UX NMS

326X Series Modem

9110 Terminal

Step 1

: Install ferrite cylinders as explained in this chapter.

Step 2: Attach an 8-pin DIN adapter cable connector to the modem’s NC IN connector.
NOTE

: The modem can be connected to either a 9- or 25-pin serial communication port on the rear of

the 9110 DMS. Figure 2-7 shows a 25-pin port connection.

Step 3

: Attach the other end of the 8-pin DIN adapter cable to the DB 25-pin connector on the 9110’s

network control 9- or 25-pin adapter cable.

Step 4: Attach the 25- or 9-pin connector to the appropriate port on the rear of the 9110 DMS.

1

2

3

Junction Box

326X Series Modem

Step 1: Install ferrite cylinders as explained in this chapter.
Step 2: Attach an 8-pin DIN adapter cable connector to the modem’s NC IN connector.
Step 3: Connect the 8-pin control-channel connector on the other end of the 8-pin DIN adapter cable

into its receptacle on a junction box.

Step 4: Attach the 50-pin connector on the network control cable to the junction box. Connect the

other end to the appropriate Digi-Board on the rear of the NMS Proxy Agent PC.

To Proxy Agent (PC), and then
to 9000-PC or 9000-UX

1

2

3

2-14 Installing the Modem

Installing

the Modem

To connect multiple modems in a daisy chain configuration, refer to Figure 2-11.

Figure 2-11. Connecting Modems in a Daisy Chain Configuration

To attach modem enclosure cards to an NMS, refer to the addendum, 326X Series
Modem Cards, shipped with the modem backplane.

Turning on the Modem

The power cable connects the rear of the modem to a standard 115V outlet. After
making other connections, plug the power cable into the modem, and then plug it
into an outlet. Turn the rear panel power switch to the On (up) position.

When powered on, the modem automatically performs a self-test of internal circuits.
The "Automatic Self-Test" section, next, describes this test and the front panel
displays that can follow it.

326X Series Modem

326X Series Modem

326X Series Modem

Step 1: Install ferrite cylinders as explained in this chapter.
Step 2: Attach an 8-pin DIN adapter cable connector to the

modem’s NC IN connector.
(The 8-pin control channel connector at the other end of
this cable is connected to a junction box, as shown in
Figure 2-8.)

Step 3

: Connect an 8-pin DIN cable from the first NC OUT

connector to the next NC IN connector, and so on.

To Junction Box

and NMS

Installing the Modem 2-15

Installing

the Modem

Automatic Self-Test

When you apply power to the modem, it automatically runs a self-test that checks for
and identifies faults in the modem’s circuits. After displaying the message SELF-
TEST, the front modem displays one of the messages shown in Table 2-1.

Handling Error Messages

If the modem fails the self-test and displays an error message, do the following:

1) Record the message to assist in troubleshooting the modem.

2) Turn the modem off and then on again, and observe the front panel display.
If the modem displays 326X READY, the earlier error message was probably
caused by a temporary power line problem. Some line problems do not affect
modem operation. If the modem continues to display an error message, contact
Telenetics Customer Support or an authorized Telenetics distributor.

After Installing the Modem...

Go on to Chapter 3, Getting Started, for information on how to configure and operate
the modem.

Table 2-1.
Self-Test Messages

This Message... Indicates:

326X Initial The modem is set to operate using factory default values.

326X Ready No faults were encountered during the self-test. The modem is ready

for operation.

[Error message] A system fault was detected during the self-test.

Getting Started 3-1

Getting Started

Chapter 3

Getting Started

Contents

Introduction .................................................................................................. 3-2

System Requirements for Software Upgrades .............................................. 3-2

Configuring and Operating the Modem ........................................................ 3-2

Using the Front Panel ............................................................................... 3-2

Navigating the Configuration Menu Tree ................................................ 3-5

Setting Configuration Options from the Front Panel ............................... 3-5

Using the Modem with a Network Management System (NMS) ............ 3-7

Using the AT Automatic Calling Unit (ACU) .......................................... 3-8

Other Call Establishment Methods ............................................................... 3-10

V.25bis ACU for Sync or Async Applications ......................................... 3-10

NetView LPDA-2 ACU for Sync Applications ........................................ 3-10

Sync Dialing from an IBM AS 400 .......................................................... 3-11

External Auto-Call Units .......................................................................... 3-11

3-2 Getting Started

Getting Started

Introduction

This chapter has three parts:

• System Requirements for Software Upgrades

• Configuring and Operating the Modem

• Other Call Establishment Methods

System Requirements for Software Upgrades

This section explains the prerequisites for an upgrade to 7.9 software. This section
does not apply to new units with 7.8 or higher software installed.

A modem can be upgraded to Release 7.9 software only if it has Release 7.0, 7.5, 7.6,
or 7.7 software.

Configuring and Operating the Modem

You can configure and operate the modem in several ways:

• From the modem front panel

• From a Network Management System (NMS)

• From the modem AT Automatic Calling Unit (ACU), if it is attached to an

asynchronous “dumb” terminal—a terminal without software—or to a PC
running an asynchronous communications software package

Each of these is described in the sections that follow.

If You Are Unsure of Your DTE’s Data Format...

The DTE manual should tell you what data format—asynchronous or synchronous—
it uses. Most PC applications use an asynchronous data format.

Using the Front Panel

You can configure and operate all modem functions using the front panel’s:

• Light-emitting diodes (LEDs)

• Liquid crystal display (LCD)

• Configuration menus

• Control keys

Figures 3-1 and 3-2 show the stand-alone modem front panel. Figure 3-3 shows the
enclosure card front panel. Note the LCD, LEDs, and control keys.

NOTE: Information specific to enclosure card modems is covered in the addendum,
326X Series Modem Cards, shipped with the modem backplane.

Getting Started 3-3

Getting Started

IMPORTANT: To use the front panel keys, the modem must be connected to an AC
power source, the rear panel power switch must be turned on, and rear panel DIP
Switches #3 and #6 must be set to the Off (up) position. See Chapter 2 for details.

Figure 3-1. Standalone 3260 Modem with Front Cover Closed

Figure 3-2. Standalone 3260 Modem with Front Cover Open

Figure 3-3. 3260 Modem Enclosure Card Front Panel

LEDs show the status of key DTE interface signals. If a communication problem
occurs, LEDs can help you determine the cause. (Refer to Chapter 6 for a quick
reference to problems and how to correct them.) Table 3-1 describes LED functions.

Table 3-1.
326X LEDs

LED Name Description

TD Transmit Data Flashes when the modem accepts data from the local DTE, to

transmit.

RD Receive Data Flashes when the modem passes received data to the local

DTE.

RI/OH Ring Indicator/

Off-Hook

On when an incoming call is ringing, and when the modem is
off-hook and connected to the dial line.

RD TR RI/OH

TD CD RC/NC

3260

104 108 125

103 109

Six front-panel LEDs
indicate status

RD TR RI/OH

TD CD RC/NC

103

104

109

108 125

326x Ready

RETURN ENTER

LCD Display

Control Keys

326x Ready

RETURN DOWN ACROSS ENTER

TD

TR

RI/OH

RD

CD

RC/NC

A/B ALM

103 104

109 108

125

Enclosure Card has eight LEDs

3-4 Getting Started

Getting Started

Front Panel Display

The front panel has a 16-character alphanumeric LCD display (see Figure 3-2 or
3-3). You access the configuration menu tree through this display, to:

• Configure the modem

• Store and view telephone numbers

• Initiate and answer calls

• View status information

• Run online tests

• Enter passwords and network addresses

CD Data Carrier

Detect

On when the local modem receives a carrier signal (as defined
by the current modulation mode) from the remote modem or
when the DCD parameter=High.

TR Data Terminal

Ready

On when a DTR signal from a terminal is detected.

RC/NC Remote Control/

Network Control

Flashes to indicate that the modem is under remote
configuration (via front panel or AT ACU).

On when the modem is under NMS control.

A/B A or B Enclosure cards only.

On when modem A front panel information is displayed.
Off when modem B front panel information is displayed.
To toggle between modem A and modem B front panels, hold

and then press .

ALM Alarm Enclosure cards only.

On when a test is in progress or a modem failure occurs. With
the 3262/3267 Modem card, if one modem fails, the ALM
LED lights and remains lit regardless of which modem front
panel is being viewed.

Table 3-1.
326X LEDs

LED Name Description

Getting Started 3-5

Getting Started

Navigating the Configuration Menu Tree

This section describes the modem menu tree structure. It explains how to access
parameters using the front panel control keys.

Menu Structure

The menu structure consists of fifteen categories, which appear in capital letters.
Example: CONFIGURATION OPT’S.

Each category has parameters (example: Mode). Some parameters are
configurable; others indicate modem and call status. Most parameters have selectable
options. Options affect the modem’s operating characteristics.

You can view parameters and options in the front panel LCD display. If options can
be set, the following indicators display:

• An equals sign (=) indicates the currently selected option of the parameter

• A colon (:) indicates that the displayed option is available but is not selected

Each parameter has a default option:

• Some defaults are determined by the assigned factory-preset option sets
(preconfigured option sets). These defaults are exclusive to an option set.

• Other factory options are not exclusive to an option set and they always have
the same default setting, regardless of which factory-preset option set you use.

Refer to Appendix A, Figure A-1, or to the Reference Card to see the complete menu
tree structure, including the available and default options.

Setting Configuration Options from the Front Panel

The four control keys (Figures 3-2 and 3-3) let you access parameters and options.
Table 3-2 describes control key functions.

Table 3-2.
Front Panel Keys

Keys Function

Return

Steps up through the menu tree from a parameter to a category, or from a
category to the default display. Example: from Te st =, pressing displays the
TEST OPTS category. Pressing again displays the default display, such as,
DATA 9600 T/D?

Across

Steps through the parameters in a menu category.

NOTES:

1) If you hold the or key down, it repeats until you stop pressing.

2) With the 3262/3267 Modems, to toggle between modem A and modem B front
panels, hold while pressing .

3-6 Getting Started

Getting Started

Example: Accessing a Configuration Option

To select a predefined configuration option set:

1) From the Data 9600 T/D? display, press until Select Options=1 displays.

2) Press to display Select Options:2, Select Options:3, or Select Options:4.

3) Press to select an option. The modem is now configured for the option.

Status Displays

The Data 9600 T/D? category is the default display when the modem is powered-up
or after the modem has “timed-out” (i.e., the front panel control keys have not been
used for at least five minutes). The data rate (9600, in the display Data 9600 T/D?) is
the current DCE (modem-to-modem) data rate. It varies with the speed at which the
modems connect. The Data 9600 T/D? category serves three primary functions:

• Talk/Data” Switch

• Operating Status Displays

• Option Sets/Dialing Options

Talk/Data Switch
Pressing when Data 9600 T/D? is displayed toggles the modem between using:

• An external telephone to manually dial a telephone call

• The modem to dial a stored or unstored telephone number

Down

Steps through categories (example: Data 9600 T/D?, TEST OPTS,
MODULATION OPT’S), or, at a parameter within a category, scrolls through
the options.

Enter

Selects an option and/or initiates an action. This key also serves as a Talk/Data
“softkey,” allowing you to toggle between using a telephone and the modem to
establish a telephone connection.

Table 3-2.
Front Panel Keys

Keys Function

NOTES:

1) If you hold the or key down, it repeats until you stop pressing.

2) With the 3262/3267 Modems, to toggle between modem A and modem B front

panels, hold while pressing .

DATA 9600 T/D?

Select Options

Getting Started 3-7

Getting Started

Operating Status Displays

The DTE19.2 RELIABL and Phase Jitter subcategories let you view modem
operating status. Example: in the DTE 19.2 RELIABL subcategory, pressing
displays:

• Operating status messages

• DTE/DCE rate/status

• Error correction/data compression status

• EIA/TIA signal status

• Disconnect reasons

• The modem’s software revision level

• Circuit Quality Monitoring System (CQMS) parameter status

For details, refer to Appendix A. For details on status displays, refer to Chapter 1, AT
Commands, of the 326X Series Modem Reference Guide.

Option Sets/Dialing Options

These status subcategories let you choose a preconfigured option set, and make other
selections to determine how the modem will establish telephone connections.

For details on configuring option sets and other call establishment options in this
category, refer to Appendix A.

Where Do I Go from Here?

When you are familiar with the front panel, configuration menu system, and control
keys, refer to the following:

• Chapter 4 for specific configuration instructions.

• Appendix A to change parameter options, and to enter and dial a telephone

number. The Reference Card shows the complete menu structure.

• Chapter 6 for a discussion of typical problems and ways to correct them.

Using the Modem with a Network Management System
(NMS)

Modem functions can be configured and controlled from an NMS. Refer to:

• The network management system documentation

• Appendix A for brief descriptions of parameter options and features

• The 326X Series Modem Reference Guide for detailed descriptions of

parameter options and features

?

3-8 Getting Started

Getting Started

Using the AT Automatic Calling Unit (ACU)

To connect the modem to an asynchronous terminal—a terminal without
software—or a PC running an asynchronous communications software package,
you use the modem’s AT Automatic Calling Unit (ACU) interface.

The AT ACU is compatible with:

• The industry-standard AT command set (AT and AT& commands)

• The Telenetics enhanced AT command set (AT

*

commands)

AT commands define how the modem is configured, how it makes calls, and what
test operations it performs. The AT command set lets you configure and operate
modem options and features from the PC or asynchronous terminal keyboard.

Using the Modem with an Async Terminal

If you are connecting the modem to an asynchronous terminal, you can use the AT
ACU to configure parameter options from the keyboard. Learn the AT command syn­tax in order to generate the appropriate AT commands.

Where Do I Go from Here?

To continue configuring the modem from an asynchronous terminal, refer to:

• Chapter 4 for configuration instructions.

• Chapter 5 to learn AT command syntax.

• Chapter 6 for a discussion of common problems and how to correct them.

• Appendix A to change configuration options. The Reference Card shows the

complete menu structure.

(The modem also supports an ITU-TS V.25bis ACU for initiating calls from an
asynchronous or synchronous DTE, described later in this chapter.)

ATZ4

?

Getting Started 3-9

Getting Started

Using the Modem with a PC and Async Communications
Software

When using the modem with a PC, you need communications or terminal emulation
software. Communications software acts as an interface—with pull-down menus or
graphics—between your PC and modem, allowing you to perform modem operations
from your PC.

It is unlikely that you will use AT commands directly to configure and test the
modem. Some communications software, however, may not support all of the
modem’s configuration options or may require you to issue commands to the modem
directly.

Communications software packages that directly support the modem (where
Telenetics 3260 Modem, Codex 3260 Modem, or Motorola 3260 Modem is a
selection within the package) support the industry standard commands (AT, AT&)
and the Telenetics-enhanced commands (AT

*

), making more knowledge of AT

command syntax unnecessary.

Communications software packages that offer a Hayes-Compatible selection do not
support Telenetics-enhanced commands: (AT

*

). In this case, you may enter AT*

commands yourself, if required by your application.

Where Do I Go from Here?

If your communications software package supports a 3260 Modem (or a comparable
3260 selection), refer to:

• Chapter 4, the “Communications Software Package Operating Notes” section.

• Chapter 4, the “Configuration Option Sets” section.

• Appendix A to change configuration options. The Reference Card shows the

complete menu structure.

If your package does not support all of the modem’s configuration options, or
requires you to issue AT commands to the modem directly, refer to:

• Chapter 5 to learn AT command syntax.

• Chapter 6 to resolve problems that you have isolated to the modem.

• Communications software documentation.

If your package supports a Hayes-Compatible selection, refer to:

• Chapter 4, the “Communications Software Package Operating Notes” section.

• Chapter 5 to learn AT command syntax.

• For AT

*

configuration settings, refer to:

— Chapter 4, the “Configuration Option Sets” section.
— Appendix A to change configuration options. The Reference Card shows

the complete menu structure.

• Chapter 6 to resolve problems that you have isolated to the modem.

?

3-10 Getting Started

Getting Started

Other Call Establishment Methods

In addition to the configuration and operation methods in this chapter, the modem
supports other methods to establish and manage telephone connections:

• V. 2 5 b i s AC U (for synchronous or asynchronous applications)

• NetView LPDA-2 ACU (for synchronous applications)

• IBM AS 400 (for synchronous dialing)

• External Auto-Call Units such as the Bell 801C

These methods are described in the sections that follow.

V.25bis ACU for Sync or Async Applications

The modem supports an ITU-TS V.25bis ACU for initiating calls from an intelligent
terminal, in synchronous or asynchronous formats, which supports:

• Addressed mode, to perform call-related tasks, such as storing phone numbers
in memory, dialing calls from memory, connecting/disregarding incoming calls

• Manual and direct call establishment methods. Direct mode lets you use DTR
transitions from the DTE to establish calls. Manual mode lets you manually
initiate and answer calls with a telephone and then transfer the call to the
modem.

Where Do I Go from Here?

For more information on the V.25bis ACU, refer to Chapter 3, Automatic Calling
Interfaces, in the 326X Series Modem Reference Guide. Programmers and System
Developers should also refer to Chapter 3 for a programming guide describing
asynchronous and synchronous data formats using the ASCII/EBCDIC character
sets.

NetView LPDA-2 ACU for Sync Applications

The modem supports Link Problem Determination Aid (LPDA-2). LPDA-2 is the
communications protocol between IBM host software and transmission devices for
exchanging diagnostic and control information. LPDA-2 commands provide a means
for an attached terminal to command the modem to dial a telephone number and
report back if the call is successful or not successful.

Where Do I Go from Here?

For more information on using the LPDA-2 ACU, refer to Chapter 3, Automatic
Calling Interfaces, in the 326X Series Modem Reference Guide for configuration
information and for information on NetView’s LPDA-2 dialing commands.

12

3

45

6

78

9

0

#

?

?

Getting Started 3-11

Getting Started

Sync Dialing from an IBM AS 400

The modem can be configured to operate as a synchronous originate modem
with the IBM AS 400. The AS 400 supports switched operation with call
origination via a V.25bis-compliant call establishment driver. In this type of
application, the modem is driven by the APPC/APPN bit-synchronous protocol.

Where Do I Go from Here?

For more information on using the modem with an IBM AS 400, refer to:

• Chapter 4 for configuration instructions.

• Chapter 3, Automatic Calling Interfaces, in the 326X Series Modem

Reference Guide for details on bit-synchronous protocol frame formats and the
V.25bis protocol.

External Auto-Call Units

The modem can be used with applications that support external dialers, such as
the Bell 801C. Once an external dialer establishes a call, it passes control of the
dial line to the modem by the MI/MIC control leads on the DIAL LINE
connector. NOTE: This type of application is supported in Canada and the
U.S.A. only.

Where Do I Go from Here?

For more information on external call units, refer to Chapter 3, Automatic
Calling Interfaces, in the 326X Series Modem Reference Guide.

?

?

Configuring the Modem 4-1

Configuring

the Modem

Chapter 4

Configuring the Modem

Contents

Overview ....................................................................................................... 4-2

Communications Software Package Operating Notes .................................. 4-2

Configuring the Modem for Use with Communications

Software ............................................................................................... 4-2

Operating Notes ....................................................................................... 4-3

If the Communications Software and Modem Do Not Operate... ............ 4-5

Preparing for Operation ................................................................................ 4-5

Reinitializing Memory from the Front Panel ........................................... 4-5

Reinitializing Memory Using the AT&F Command ................................ 4-5

Configuration Option Sets ............................................................................ 4-6

What is an Option Set? ............................................................................. 4-6

Configuring an Option Set ....................................................................... 4-10

Option Set Defaults .................................................................................. 4-11

326X V.32bis and 326XFA S T Modem Application Examples .................... 4-16

Option Set 1—Async Calls to Central Site Using AT ACU .................... 4-17

Option Set 2—Sync Answering Central Site Without ACU .................... 4-18

Option Set 3—Sync Calls to Central Site, V.25bis ACU ......................... 4-18

Option Set 4—Async Answering Central Site

without ACU (Models 3260/62/65/67) ................................................ 4-19

Option Set 4—Synchronous Leased Line Applications

with Dial Restoral (Models 3261/63/66/68) ........................................ 4-20

326XFA ST-SDC Modem Application Examples ......................................... 4-21

SDC Pre-Operation Notes ........................................................................ 4-21

Configuring the Modem for SDC Operation ............................................ 4-22

SDC Sample Applications ........................................................................ 4-22

Remote Access Reset ................................................................................... 4-28

Operation .................................................................................................. 4-28

When Remote Access Reset Is Disabled ...................................................... 4-28

4-2 Configuring the Modem

Configuring

the Modem

Overview

This chapter explains how to configure the modem, in conjunction with Chapter 3,
Getting Started. Read Chapter 3 before continuing. Then select an option:

• If the application requires a communications software package, read the
section, “Communications Software Package Operating Notes”.

• If you have previously installed the 326X in another application, the section
“Preparing for Operation” explains how to reinitialize the modem memory so it

can be installed in a new application.

• To configure quickly, the 326X Series Modem offers four preconfigured
option sets. Each option set is tailored for an application and stored in the

modem’s nonvolatile memory. Refer to the section “Configuration Option Sets”
to determine if an option set is appropriate for your application.

• The following two sections provide examples of common 326X applications
and tell you how to configure the modem for each application. These

sections will help you to configure the modem quickly.

• If you are unfamiliar with the AT command set or the modem front panel,
refer to the section “Remote Access Reset”, later in this chapter. Once this is
done, you can use a remote modem to configure the local modem.

If the modem is part of a network and you have a Network Management System
(NMS) installed, consult your network manager for configuration information.

Communications Software Package Operating Notes

This section provides information for configuring the 326X Series Modem to work
with communications software packages.

Configuring the Modem for Use with Communications
Software

Select the Modem’s Preconfigured Option Set 1

Option Set 1 (the modem’s factory default setting) is for use with communications
software in asynchronous dial applications, where the AT ACU originates calls.

Refer also to:

•“Operating Notes” at the end of this section

•“Configuration Option Sets”

Configuring the Modem 4-3

Configuring

the Modem

What to Select in the Communications Software Package’s Modem Menu List

1) Select Telenetics 3260 Modem, Codex 3260 Modem, Motorola 3260
Modem, or another 3260 option from the package’s modem list. Packages that

directly support the 326X Series Modem support industry-standard commands
and Telenetics-enhanced commands, making further configuration unneces­sary.

2) If a 3260 option does not appear in the list, contact the software manufacturer
for the latest version of the package (which should have such an option).

3) Select a Hayes-Compatible entry. With this option, Telenetics-enhanced
commands (AT

*

) are not supported.

4) Try operating the communications software. If you have problems, refer to the
“Operating Notes” section, next, and to Chapter 6, Troubleshooting Guide.

Operating Notes

Keep the following in mind when using the modem with communications software.

General Notes

The information in this section applies to all 326X Series Modem platforms.

Selecting an Option Set

Option Set 1 was designed for use with asynchronous communications software
packages. It is compatible with most communications software. Option Sets 2, 3, and
4 are intended for different applications and have different default settings. Select
Option Set 1 when using a communications software package.

Establishing a Connection with Option Set 1

With Option Set 1, the modem operates as follows:

1) The modem attempts to establish a LAPM connection.

2) If the connection is unsuccessful, the modem attempts to establish an MNP

connection.

3) If the previous connections are unsuccessful, the modem attempts a Normal
mode connection to the remote modem. All data that is sent to the modem’s
attached computer terminal before the modem establishes a connection is lost.

Auto Dialing and Answering in Option Set 1

When the modem is configured for Option Set 1, and the communications software
package executes an auto dialing and answering operation, the modem automatically
adjusts its baud rate to the communications software baud rate and parity. This rate
remains constant during the established connection.

4-4 Configuring the Modem

Configuring

the Modem

Direct Operating Mode

If you select Mode=Direct (EC/DC OPT’S category):

• Speed conversion and flow control are not supported. If the communications
package does not support speed detect, change the 326X’s modulation mode to

Auto V.32, and after a connection is established, change the communications
software rate to match the modem’s connection rate.

• If the communications package supports data rates higher than 9.6 kbps, set the
modem’s maximum rate (Max Rate, AT

*

MX) to the higher rate and disable
the adaptive rate feature before placing or answering calls. Ensure that the
package’s speed and the modem’s connection rate match when the connection
is established. NOTE: Some communications software packages support the
automatic speed detect feature, which automatically matches the modem’s baud
rate with the software package’s baud rate.

Transferring a File

Refer to the communications package instructions for the procedure for transferring
files using the communications software package’s supported protocols.

Ring Messages

Some communications packages wait for ring messages to be received before the
modem answers incoming calls. The 326X Series Modem must be set to the
communications software package’s baud rate before the package recognizes the ring
message. Set DTE Rate, by the front panel or by issuing an AT command, when the
modem is configured for autobaud operations.

Flow Control Requirements

• Flow control prevents buffer overflow when line disturbances cause frequent
retransmissions. See “AT

*

FL” (for the DTE) and “AT*MF” (for the modem)

in Appendix A.
If the communications package does not directly support the 326X Series

Modem and you want to use the package’s file transfer method:

• If the communications package supports RTS/CTS flow control, enable it:

a) Set the modem to Flow=RTS/CTS
b) Set Modem Flow=Off
c) Transfer data, using the instructions in the communications package.

• If the communications package does not support RTS/CTS flow control:

a) Set the modem to Flow=Off
b) Set Modem Flow=Off
c) Transfer data, using the instructions in the communications package.

• If the communications package supports the automatic speed detect
feature, set Max Rate to a value also supported by the software package.
Set Speed Conver=Off. Set the modem’s adaptive rate parameter to Off.

Configuring the Modem 4-5

Configuring

the Modem

326XFA S T V.34 and 326XFA S T-SDC Notes

The information in this section applies when operating at the higher DTE rates
available with the 326XFA S T V.34 and 326XFA S T-SDC Series Modems.

• If the communications software package supports the higher terminal rates
available with these modems, and you want to use the package’s auto dial or
auto answer features, set the modem’s DTE Rate (TERMINAL OPT’S
category) to that of the package.

• Some communications packages do not let you select the higher rates available
with the 326XFA S T V. 3 4 modem while using the package’s auto dial or auto
answer functions. To take advantage of the higher DTE rates, do the following:

a) Set the package for Direct or Terminal mode.
b) Select the higher speed of the package.
c) Set the modem’s DTE Rate to match the package’s set speed.
d) Use the AT command set to establish the connection.

• Some file transfer protocols offered by a communications package may not
operate properly when DTE Rate is greater than 38.4 kbps, because some
serial ports cannot sustain data transmission at these rates.

If the Communications Software and Modem Do Not
Operate...

If, after following the suggestions in this section, you cannot get the communications
software package and modem to operate, refer to Chapter 6, Troubleshooting Guide.
If you still cannot get the communications software package and modem to operate,
contact your software vendor for assistance.

Preparing for Operation

The procedures in this chapter assume that you are installing the modem for the first
time. If you want to reinstall the modem, perform the procedure(s) below to
reinitialize the modem’s memory. NOTE: Reinitializing modem memory sets
modem parameter options back to factory defaults (Option Set 1) and deletes stored
telephone numbers from memory.

Reinitializing Memory from the Front Panel

1) Press twice. Press until the modem displays Reinit Memory.

2) Press . The modem displays Reinit Mem?

3) Press to reinitialize modem memory.

Reinitializing Memory Using the AT&F Command

You can also reinitialize memory by entering AT&F<CR> from the terminal.

4-6 Configuring the Modem

Configuring

the Modem

Configuration Option Sets

This section discusses the modem’s preconfigured option sets, in three parts:

• What is an Option Set?

• How to Configure an Option Set

• Option Set Defaults—326X V.32bis, 326XFA S T V.34, and 326XFA S T -SDC

What is an Option Set?

Option sets are complete configurations, each tailored for an application and stored
in memory. Option sets get the modem working quickly.

If an option set does not exactly suit your needs, pick the one that most closely
matches your application, modify its settings, and save the changes in the modem’s
nonvolatile memory (refer to Appendix A).

Table 4-1 shows V.3bis and V.34

option sets. Table 4-2 shows SDC option sets.

Table 4-1.
Option Set Summary—326X V.32bis and V.34 Modems

Application

Option
Set

Async dial applications in which you are using the AT ACU to originate calls to
a central site (default option set)

1

Sync central site auto-answer applications; no ACU 2
Sync calls to a central site 3
Async central site auto-answer applications; no ACU (Models 3260/62/65/67) 4
Leased line application with dial restoral; no ACU (Models 3261/63/66/68) 4

Table 4-2.
Option Set Summary—326X

FA S T

-SDC Modem

Application

Option
Set

Async dial applications in which you are using the AT ACU to originate calls to
a central site (default option set)

1

Sync dial A/B restoral application 2
Sync dial only application 3
Sync leased line application with dial restoral; no ACU (Models 3261/63/66/68) 4

Configuring the Modem 4-7

Configuring

the Modem

Option Set Descriptions—326X V.32bis and V.34 Modems

Option Set 1—Async Calls to Central Site Using the AT ACU

With Option Set 1, the modem communicates over dial lines using an asynchronous
data format. This option set is appropriate for home or office use where you plan to
dial, for example, into a central-site computer, minicomputer, an electronic bulletin
board, or a personal computer. When you first install the modem, it is set to power up
with Option Set 1 as the factory default. The modem recognizes the standard AT
Command Set and the Telenetics-enhanced AT Command set.

To satisfy common asynchronous communications software packages, Option Set 1
holds several EIA 232-D (ITU V.24) control signals asserted (see Tables 4-1 and
4-2). The modem originates calls and answers incoming calls according to the setting
of S-Register 0 (see the “S-Registers” section in Chapter 5 for more information).

At the beginning of each connection, the modem negotiates the highest common data
rate with the remote modem set to its factory default setting or automode. The
modem also uses the adaptive rate feature in the V.34, V.32bis, or V.32 modulation
modes. This ensures maximum throughput when line quality is poor.

Option Set 2—Sync Answering Central Site Without an ACU

Option Set 2 satisfies the needs of a synchronous application where most calls are to
a central site (see Table 4-1).

Because calls are received primarily at the central site, the modem is set to answer
calls automatically. With DTR=108.2, the local DTE can control the DTR signal.
This allows the local DTE to use DTR transitions to connect the modem to the
central site at the beginning of transmission and disconnect it when transmission
ends.

At the beginning of each connection, the modem negotiates the highest common data
rate with the remote modem. The modem uses the adaptive rate feature in the V.34,
V.32bis, or V.32 modulation modes. This ensures maximum throughput when line
quality is poor.

Option Set 3—Sync Calls to Central Site Using the V.25bis ACU

Option Set 3 satisfies the needs of a synchronous application, where the remote
modems originate calls to a central site (see Table 4-1).

With Option Set 3, the modem originates calls with its V.25bis ACU. The DTR
option is set to 108.2 so that the V.25bis ACU can manipulate the DTR signal. All
other options in the ACU OPT’S category are set for a typical synchronous DTE.

At the beginning of each connection, the modem negotiates the highest common data
rate with the remote modem. The modem uses the adaptive rate feature in the V.34,
V.32bis, or V.32 modulation modes. This ensures maximum throughput when line
quality is poor.

4-8 Configuring the Modem

Configuring

the Modem

Option Set 4—Async Answering Central Site Without an ACU (Models 3260/
62/65/67)

Option Set 4 satisfies the needs of an asynchronous application where most calls are
inbound (see Table 4-1).

Because calls are received primarily at the central site, the modem is set to answer
calls automatically. With DTR=Discon, the local DTE can control the DTR signal.
This allows the local DTE to use DTR transitions to connect the modem to the
central site at the beginning of transmission and disconnect it when transmission
ends. The DTR signal from the DTE must be high for the modem to auto-answer. If
the DTR signal is low, it does not answer incoming calls.

At the beginning of each connection, the modem negotiates the highest common data
rate with the remote modem. The modem uses the adaptive rate feature in the V.34,
V.32bis, or V.32 modulation modes. This ensures maximum throughput when line
quality is poor.

Option Set 4—Sync Leased Line Applications With Dial Restoral (Models
3261/63/66/68)

Option Set 4 uses the modem’s leased line restoral feature. With this option set, the
modem operates primarily on a leased line unless that line fails. If so, the modem
automatically restores the connection over a single dial line. You must install a 326X
Series Modem at both ends of the leased line to implement restoral operation.

Option Set 4 configures the modem for a general restoral application (see Table 4-1).
The modem uses the adaptive rate feature in the V.34 or V.32bis Auto modes. This
ensures maximum throughput when line quality deteriorates. Ifrestoral criteria are
met, the modem automatically reroutes data traffic through the public switched
telephone network (PSTN) over a single dial line. At that time, the modem attempts
to run at its maximum rate over the dial line, and falls back to lower speeds if
required. After an hour, the modem returns to the leased line.

If you operate your modems in leased-line mode with Option Set 4, and one modem
has software Revision 7.8 or 7.9, set the Fast Call parameter (AT

*

FC, Modulation

Opts Menu) to Off in both modems.

Option Set Descriptions—326XFA S T-SDC Modems

Option Set 1—Async Calls to Central Site

Option Set 1 in the 326X-SDC product functions the same as Option Set 1 above.

Option Set 2—Sync Dial A/B Restoral

Option Set 2 satisfies the needs of a synchronous point-to-point digital link restoral
application (see Table 4-2).

With this option set, the Clock is set to External as network timing is provided by the
DSU/CSU. NOTE: With this option set, (for Telenetics and Motorola DSU/CSUs as
well as non-Telenetics and non-Motorola DSU/CSUs), the DSU’s restoral configura­tion should be set to Timing=Internal.

Configuring the Modem 4-9

Configuring

the Modem

With this option set, the local and remote modems are configured for SDC operation.
The modems default to Fast Call=Lvl3, and use LAPM error correction with
modified V.42bis data compression. Enable Option Set 2 in both the local and remote
modems, and ensure that Mode (AT

*

SM) is set the same in both modems.

The modem uses the adaptive rate feature in the V.34 Auto modulation mode. This
ensures maximum throughput when line quality is poor.

Option Set 3—Sync Dial Only

Option Set 3 satisfies the needs of a synchronous dial application (see Table 4-2).
With Option Set 3, the modem provides the network timing (Clock=Internal).
Select a data rate at which the modem communicates with the DTE, using DTE Rate
(AT

*

DE). Consult the description in Appendix A.

With this option set, the local and remote modems are configured for SDC operation.
The modems default to Fast Call=Lvl3, and use LAPM error correction with a
modified V.42bis data compression. Enable Option Set 3 in both the local and remote
modems, and ensure that Mode (AT

*

SM) is set the same in both modems.

With Option Set 3, DTR=108.1 so that an off-to-on DTR transition instructs the
modem to connect to the telephone line. If the modem detects an incoming call, the
call is connected. If the modem does not detect an incoming call and Default Dial
(AT

*

DA) is enabled, the modem dials the number specified. If Default Dial is

disabled, the modem refers to the Modulation Mode option (AT

*

MM). If set to
Answer, the modem goes off-hook and sends an answer-back tone. An on-to-off
DTR transition disconnects the modem from the telephone line. If DTR is low, the
modem does not auto-answer. DTR transitions govern how the modem answers and
disconnects calls. All options in the ACU OPT’S category are set for a typical
synchronous DTE.

The modem uses the adaptive rate feature in the V.34 Auto modulation mode. This
ensures maximum throughput when line quality is poor.

Option Set 4—Sync Leased Line with Dial Restoral; No ACU
(Models 3261/63/66/68)

Option Set 4 uses the modem’s leased line restoral feature. With this option set, the
modem operates primarily on a leased line unless that line fails. If so, the modem
automatically restores the connection over a single dial line. You must install a
326XFA S T-SDC Modem at both ends of the leased line to implement restoral.

Option Set 4 configures the modem for a general restoral application (see Table 4-2).
The modem uses the adaptive rate feature in the V.34 Auto modulation mode. This
setting ensures maximum throughput when line quality deteriorates. If restoral
criteria are met, the modem automatically reroutes data traffic through the public
switched telephone network (PSTN) over a single dial line. At that time, the modem
attempts to run at 28.8 kbps over the dial line, and falls back to lower speeds if
required. After an hour, the modem returns to the leased line.

With Option Set 4, the modem provides the network timing (Clock=Internal).
Select a data rate at which the modem communicates with the DTE, using DTE Rate
(AT

*

DE). Refer to the description in Appendix A.

4-10 Configuring the Modem

Configuring

the Modem

In this option set, the local and remote modems are configured for SDC operation.
The modems default to Fast Call=Lvl3, and use LAPM error correction with
modified V.42bis data compression. Enable Option Set 4 in both the local and remote
modems, and ensure that Mode (AT

*

SM) is set the same in both modems.

Refer to “326X V.32bis and 326XFAST Modem Application Examples” below.

If you operate your modems in leased-line mode with Option Set 4, and one modem
has software Revision 7.8 or 7.9, set the Fast Call parameter (AT

*

FC, Modulation

Opts Menu) to Off in both modems.

Configuring an Option Set

This section describes how to configure and save an option set.

From the Modem Front Panel:

1) Read “Preparing for Operation,” earlier in this chapter.

2) Identify the option set for your application. The default is Option Set 1.

3) Display SELECT OPTIONS on the front panel (refer to Chapter 2 to review

the function of front panel control keys).

4) Press until the modem displays SELECT OPTIONS:n, where n=1-4.

5) Press to select an option set. The modem displays SELECT OPTIONS=n.

Using the ATZ Command:

1) Read “Preparing for Operation,” earlier in this chapter.

2) Identify the option set for your application. The default is Option Set 1.

3) Ty pe AT Z n<CR>, where n=1-4.
NOTE: The modem disconnects from the line when the ATZ command is

entered, and any test in progress is immediately terminated. Since any AT
command following the ATZ command is ignored by the modem, make sure
ATZ is the last command entered in the command string.

To create a customized option set:

Using the AT&W Command:

1) Using the ATZn command, select an option set n that most closely suits the
application.

2) Use AT commands (see Appendix A) to change parameter options. For
example, to change RTS/CTS delay from its time in S-Register 26, to 15 ms,
enter

AT*DL1<CR>.

The front panel displays OK.

3) Enter AT &W n, where n specifies the address (option set) where the new

customized option set is stored.
The front panel displays SAVING OPTIONS.

4) After a few seconds, your modifications are stored in the modem’s nonvolatile
memory, and the modem front panel displays SAVE COMPLETED!

5) Do not turn off modem power until SAVE COMPLETED! appears.

Configuring the Modem 4-11

Configuring

the Modem

From the Modem’s Front Panel:

1) Identify the option set that most closely suits the application. The default is 1.

2) Display the option(s) you want to modify using and . Fo rexample, to

change Max Rate from 2400 to 7200, display Max Rate: 7200.
Press . The display flashes three times and the colon changes to an equals

sign. The new option is temporarily saved and Max Rate=7200 displays.

3) Step across the Status/Option Sets/Dialing menu by pressing until you see:
Save Changes=n.

4) Use the key to display the option set number where you want the changes
saved, and then press . The modem displays Saving Options.

5) After a few seconds, the modifications are stored in the modem’s nonvolatile
memory, and the modem displays SAVE COMPLETED!

6) Do not turn off modem power until SAVE COMPLETED! appears.

Option Set Defaults

Table 4-3 summarizes option set defaults for 326X V.32bis and 326X V.34 modems.

Table 4-4 summarizes option set parameter defaults for 326X V.34-SDC modems.

Table 4-3.
Option Set Defaults—326X V.32bis and 326X V.34 Modems

Parameter Option Set 1 Option Set 2 Option Set 3

Option Set 4
(3260/62/65/67)

Option Set 4
(3261/63/66/68)

MOD OPT’S

Line Dial Dial Dial Dial 2W Lease
Mod* V.32bis Auto/

V. 34 A ut o

V.32bis Auto/
V. 34 A ut o

V.32bis Auto/
V. 34 A ut o

V.32bis Auto/
V. 34 A ut o

V.32bis Auto/

V. 34 Au to
Auto Type CCITT CCITT CCITT CCITT CCITT
Low Speed Country-specific Country-specific Country-specific Country-specific Country-specific
Max Rate* 14.4/ 33.6 14.4/ 33.6 14.4/ 33.6 14.4/ 33.6 14.4/ 33.6
Min Rate 300 300 300 300 300
V.34 Asym [none]/On* [none]/On* [none]/On* [none]/On* [none]/On*
Fast Call Off Off Off Off Off
Adaptive Rate On On On On On
Mode Originate Answer Originate Answer Answer
Clock Internal Internal Internal Internal Internal
Retrain High BER High BER High BER High BER High BER
Longspace Off Off Off Off Off
PSTNOnOnOnOnOn
Guard Tone Country-specific Country-specific Country-specific Country-specific Country-specific

*V.32bis Series default shown first/V.34 Series default shown second

4-12 Configuring the Modem

Configuring

the Modem

RESTORAL OPT’S (modems without the restoral function display only the HOLD DIALINE option)

Restore Off Off Off Off FP/Auto
L to D Low/Fast Low/Fast Low/Fast Low/Fast Low/Fast
D to L Manual Manual Manual Manual 1 Hr
Hold Dialine Off Off Off Off Off
Ans Rest LL Fail LL Fail LL Fail LL Fail LL Fail

EC/DC OPT’S

Mode Auto Rel Direct Direct Auto Rel Direct
Buffers Regular Regular Regular Regular Regular
EC V.42 V.42 V.42 V.42 V.42
DC Enabled Enabled Enabled Enabled Enabled
Break Destruct Destruct Destruct Destruct Destruct
Modem Flow On On On On On
Delay Off Off Off Off Off
EC ID Default Default Default Default Default

ACU OPT’S

ACU Select AT None V.25b None None
AT Form Async Async Async Async Async
V25 Form Bitsync Bitsync Bitsync Bitsync Bitsync
NoACU Form Async Sync Sync Async Sync
Default Dial Off Off Off Off 1
Answer Country-specific Country-specific Country-specific Country-specific Country-specific
Async Echo On On On On On
Char Length1010101010
V25 Char ASCII ASCII ASCII ASCII ASCII
Sync Idle Char Char Char Char Char
V25 Resp V25bis V25bis V25bis V25bis V25bis
Parity V.25bis V.25bis V.25bis V.25bis V.25bis
AT Msg Before CD Before CD Before CD Before CD Before CD
Rslt Code Enable Enable Enable Enable Enable
ResltForm Verbose Verbose Verbose Verbose Verbose
Con Msg DTE Rate DTE Rate DTE Rate DTE Rate DTE Rate
Rel Msg Off Off Off Off Off
LPDA2 Addr FF FF FF FF FF
LPDA2 ID 326X 326X 326X 326X 326X
LPDA2 Det Enable Enable Enable Enable Enable
Call Progress44444

Table 4-3.
Option Set Defaults—326X V.32bis and 326X V.34 Modems (Continued)

Parameter Option Set 1 Option Set 2 Option Set 3

Option Set 4
(3260/62/65/67)

Option Set 4

(3261/63/66/68)

*V.32bis Series default shown first/V.34 Series default shown second

Configuring the Modem 4-13

Configuring

the Modem

TERMINAL OPT’S

DTE Rate* Auto 14.4/28.8 14.4/28.8 19.2 14.4/28.8
Flow XON/XOFF XON/XOFF XON/XOFF XON/XOFF XON/XOFF
Speed Conver On On On On On
DTR High 108.2 108.2 Discon High
RTS High Normal Normal Normal Normal
CTS AsynSync Normal Normal Normal Normal
RTS/CTS Delay00000
DCD High Normal Normal Normal Normal
RemRST/DCD Codex Codex Codex Codex Codex
DCD Loss Dis S10 S10 S10 S10 S10
DSR High Drop on Disc Normal Normal Normal
Overspeed 1% 1% 1% 1% 1%
DTR Delay S25 S25 S25 S25 S25
DTE Ct 140 Off Off Off Off Off
DTE Ct 141 Off Off Off Off Off
DTE Pin 2 5 Test Tes t Test Test Tes t
Ext Select Off Off Off Off Off
Ext Cntrl Pin 14 Pin 14 Pin 14 Pin 14 Pin 14
Inactivity S30 S30 S30 S30 S30

Table 4-3.
Option Set Defaults—326X V.32bis and 326X V.34 Modems (Continued)

Parameter Option Set 1 Option Set 2 Option Set 3

Option Set 4
(3260/62/65/67)

Option Set 4

(3261/63/66/68)

*V.32bis Series default shown first/V.34 Series default shown second

4-14 Configuring the Modem

Configuring

the Modem

Table 4-4.
Option Set Defaults—326X-SDC V.34 Modem

Option Option Set 1 Option Set 2 Option Set 3

Option Set 4
(3261/63/66/68)

MOD OPT’S

Line Dial Dial Dial 2W Lease
Mod V.34 Auto V.34 Auto V.34 Auto V.34 Auto
Auto Type CCITT CCITT CCITT CCITT
Low Speed Country-specific Country-specific Country-specific Country-specific
Max Rate 33.6 33.6 33.6 33.6
Min Rate 300 9600 9600 9600
V.34 Asym On On On On
Fast Call Off Lvl3 Lvl3 Lvl3
Adaptive Rate On On On On
Mode Originate Answer Originate Answer
Clock Internal External Internal Internal
Retrain High BER High BER High BER High BER
Longspace Off Off Off Off
PSTN OnOnOnOn
Guard Tone Country-specific Country-specific Country-specific Country-specific

RESTORAL OPT’S

Restore Off Off Off FP/Auto
L to D Low/Fast Low/Fast Low/Fast Low/Fast
D to L ManualManualManual1 Hr
Hold Dialine Off Off Off 5min
Ans Rest LL Fail LL Fail LL Fail LL Fail

EC/DC OPT’S

Mode Auto Rel Auto Rel Auto Rel Auto Rel
Buffers Regular Regular Regular Regular
EC V.42 V.42 V.42 V.42
DC Enabled Enabled Enabled Enabled
Data Form NRZ NRZ NRZ NRZ
Break Destruct Destruct Destruct Destruct
Modem Flow On On On On
Delay Off Off Buff or S38 Off
EC ID Default Default Default Default

ACU OPT’S

ACU Select AT None None None
AT Form Async Async Async Async
V25 Form Bitsync Bitsync Bitsync Bitsync
NoACU Form Async Sync Sync Sync
Default Dial Off 1 1 1

Configuring the Modem 4-15

Configuring

the Modem

Answer Country-specific Country-specific Country-specific Country-specific
Async Echo On On On On
Char Length10101010
V25 Char ASCII ASCII ASCII ASCII
Sync Idle Char Char Char Char
V25 Resp V25bis V25bis V25bis V25bis
Parity V.25bis V.25bis V.25bis V.25bis
AT Msg Before CD Before CD Before CD Before CD
Rslt Code Enable Enable Enable Enable
ResltForm Verbose Verbose Verbose Verbose
Con Msg DTE Rate DTE Rate DTE Rate DTE Rate
Rel Msg Off Off Off Off
LPDA2 Addr FF FF FF FF
LPDA2 ID 326X 326X 326X 326X
LPDA2 Det Enable Enable Enable Enable
Call Progress4444

TERMINAL OPT’S

DTE Rate Auto 56.0 U.S. A., Canada

64.0 other countries

56.0 U.S. A., Canada

64.0 other countries

56.0 U.S. A., Canada

64.0 other countries
Flow XON/XOFF Tx Clk Tx Clk Tx Clk
TpDlyMin —NA— Rx Clk Rx Clk Rx Clk
Speed Conver On On On On
DTR High Tail 108.1 High
RTS High Normal Normal Normal
CTS AsynSync Normal Normal Normal
RTS/CTS Delay0000
DCD High Normal Normal Normal
RemRST/DCD Codex Codex Codex Codex
DCD Loss Dis S10 S10 S10 S10
DSR High Normal Normal Normal
Overspeed 1% 1% 1% 1%
DTR Delay S25 S25 S25 S25
DTE Ct 140 Off Off Off Off
DTE Ct 141 Off Off Off Off
DTE Pin 25 Test Test Test Test
Ext Select Off Off Off Off
Ext Cntrl Pin 14 Pin 14 Pin 14 Pin 14
Inactivity S30 S30 S30 S30

Table 4-4.
Option Set Defaults—326X-SDC V.34 Modem (Continued)

Option Option Set 1 Option Set 2 Option Set 3

Option Set 4
(3261/63/66/68)

4-16 Configuring the Modem

Configuring

the Modem

326X V.32bis and 326XFA ST Modem Application Examples

This section provides application examples for each option set, and notes options
you may need to change from factory default settings for each option set.

For This Type of Application... Select...

The modem connected to a remote terminal dialing into an asynchronous
host computer (VAX, for example)

Option Set 1

The modem connected to a remote PC dialing into a LAN (remote node
and remote control application)

Option Set 1

Remote X-Terminal dialing to a UNIX workstation or PC into a central site
(for example, a UNIX-based terminal server or mini-computer)

Option Set 1

The modem connecting LANs via dial-up router/bridge Option Set 1
The modem connected to a terminal calling an X.25 network or an elec-

tronic bulletin board

Option Set 1

The modem as an answer modem connected to one of the following:

• A Front End Processor (FEP) or host computer

• An X.25 host/node

• Asynchronous router/bridge

Option Set 2

Cluster controller calling a host computer Option Set 3
Synchronous terminal calling a host computer Option Set 3
Router/bridge calling another router/bridge Option Set 3
X.25 node/host computer calling another X.25 node/host computer Option Set 3
The modem as an external restoral device for leased line failure Option Set 3
Bandwidth on demand for leased line applications Option Set 3
Synchronous Dialing from an IBM AS 400 Option Set 3
The modem as an answer modem connected to one of the following:

• An electronic bulletin board

• An asynchronous host computer

• A terminal server

• An asynchronous dial-up router/bridge

Option Set 4
(Models 3260/

62/65/67)

The modem connecting routers/bridges on a leased line Option Set 4

(Models 3261/
63/66/68)

The modem connecting an FEP to a cluster controller Option Set 4

(Models 3261/
63/66/68)

The modem connecting two FEPs Option Set 4

(Models 3261/
63/66/68)

X.25/statistical multiplexer internodal with dial restoral Option Set 4

(Models 3261/
63/66/68)

Configuring the Modem 4-17

Configuring

the Modem

Option Set 1—Async Calls to Central Site Using AT ACU

Changing Default Configuration Settings

Depending on application requirements, you may need to change the following:

• Buffer Delay (AT

*

DB, EC/DC OPTS category), when enabled, allows
buffered data in the communications link to be effectively transmitted to the
other modem before the modems disconnect. Enable this feature if your
application does not ensure a complete transfer of data before the modems
disconnect.

• When the 326X is configured for Option Set 1: if you do not use the AT ACU
to send commands to operate the modem, you must customize the DTE port by
selecting these options:

— DTE Rate. Set the modem’s DTE rate to match the asynchronous DTE’s

rate using the DTE Rate option (AT

*

DE, TERMINAL OPTS category).

— Parity. Set the modem’s parity to match the parity set in the asynchro-

nous DTE using the Parity option (AT

*

RP, ACU OPTS category).

— Character Length. Set the modem’s character length (Char Length,

ACU OPTS category) to match the length set in the asynchronous DTE.

(Refer to Appendix A for parameter and setting descriptions.)

• In Option Set 1, the default settings assume you will use the AT ACU to oper­ate the modem (for example, the default for ACU Select=AT; EIA signals are
set high). If you plan on using DTR transitions (“DTR Dialing”) to signal the
modem to make a call (rather than AT Commands), do the following:

1) Set Default Dial=1 (AT

*

DA, ACU OPTS category).

2) Store a number in memory location 1 (using Enter Phone #, AT&Z,
9600 T/D? category).

3) Set DTR=108.1 (AT&D, TERMINAL OPTS category). When DTR is
raised, the modem will dial the specified call.

• If the DTE does not require EIA signal pins to be held high, adjust the EIA
settings (TERMINAL OPTS category) to match your application requirements.

• In Option Set 1, the modem is set for XON/XOFF (software) flow control. If
your application requires hardware flow control, change the Flow setting
(AT

*

FL, TERMINAL OPTS category).

4-18 Configuring the Modem

Configuring

the Modem

Option Set 2—Sync Answering Central Site Without ACU

Changing Default Configuration Settings

Depending on application requirements, you may need to change the following:

• In Option Set 2, the default for network timing is Clock=Internal (AT&X,
MODULATION OPTS category). It may be necessary to change the timing to
external or loopback, depending on the network clocking source.

• In Option Set 2, the default for ACU Select=None. If you want an ACU to
operate the modem, select an ACU and a data format.

• Customize the DTE port as follows:

Set the modem’s DTE rate to match the synchronous DTE’s rate using DTE
Rate (AT

*

DE, TERMINAL OPTS category) (refer to Appendix A for

parameter and setting descriptions.)

• The default Answer option is country-specific. Refer to Appendix C to verify
that this option is appropriate for your application.

• If the DTE does not provide DTR, the modem will not automatically answer an
incoming call. Set DTR=High (AT&D, TERMINAL OPTS category).

Option Set 3—Sync Calls to Central Site, V.25bis ACU

Changing Default Configuration Settings

Depending on application requirements, you may need to change the following:

• In Option Set 3, the default setting for network timing is Clock=Internal
(AT&X, MODULATION OPTS). It may be necessary to change the timing to
external or loopback, depending on the network clocking source.

• In Option Set 3, the default setting for ACU Select=None. If you want an ACU
to operate the modem, select an ACU and a data format.

• Customize the DTE port by selecting this option:

Set the modem’s DTE rate to match the synchronous DTE’s rate using the
DTE Rate option (AT

*

DE, TERMINAL OPTS).

(Refer to Appendix A for parameter and option descriptions.)

• If you plan on using DTR transitions (“DTR Dialing”) to signal the modem to
make a call (rather than issuing commands from an ACU), do the following:

1) Set Default Dial=1 (AT

*

DA, ACU OPTS category).

2) Store a number in memory location 1 (using Enter Phone #, AT&Z,
ATAT 9600 T/D? category).

3) Set DTR=108.1 (AT&D, TERMINAL OPTS category). When DTR is
raised, the modem will dial the specified call.

Configuring the Modem 4-19

Configuring

the Modem

Synchronous Dialing from an IBM AS 400

The modem operates as a synchronous originate modem with the IBM AS 400. Set
the modem to Option Set 3—no reconfiguration from this Option Set is
necessary. The AS 400 supports switched operation with call origination via a

V.25bis compliant call establishment driver.Using Option Set 3 allows it to be driven
by APPC/APPN, the bit-synchronous protocol supported by the IBM AS 400.

In an AS 400-to-AS 400 (mainframe-to-mainframe) environment, the setting of the
Calling Number parameter is critical to ensure the AS 400 operates properly with the
modem. Rather than entering the phone numbers you will be calling, set CALLNBR
to *NONE. This setting allows you to properly utilize V.25bis commands.

Chapter 3, Automatic Calling Interfaces, in the 326X Series Modem Reference
Guide, describes bit-synchronous protocol frame formats.

Option Set 4—Async Answering Central Site without ACU
(Models 3260/62/65/67)

Changing Default Configuration Settings

Depending on application requirements, you may need to change the following:

• The Buffer Delay feature (AT

*

DB, EC/DC OPTS category), when enabled,
allows buffered data in the communications link to be effectively transmitted to
the other modem before the modems disconnect. Enable this feature if your
application does not ensure a complete transfer of data before the modems
disconnect.

• The default Answer option is country-specific. Refer to Appendix C to verify
that this option is appropriate for your application.

• In Option Set 4, the default option for ACU Select=None. If you want an ACU
to operate the modem, select an ACU and a data format.

• If you do not use the AT ACU to send commands to operate the modem,
customize the DTE port as follows:

— Set the modem’s DTE rate to match the asynchronous DTE’s rate using

DTE Rate (AT

*

DE, TERMINAL OPTS category).

— Set the modem’s parity to match the parity set in the asynchronous DTE

using Parity (AT

*

RP, ACU OPTS category).

— Set the modem’s character length, using Char Length (ACU OPTS

category) to match the character length in the asynchronous DTE.

(Refer to Appendix A for parameter and setting descriptions.)

• In Option Set 4, the modem is set for XON/XOFF (software) flow control. If
your application requires hardware flow control, change the Flow option
(AT

*

FL, TERMINAL OPTS category).

• If the DTE does not provide DTR, the modem will not automatically answer an
incoming call. Set DTR=High (AT&D, TERMINAL OPTS category).

4-20 Configuring the Modem

Configuring

the Modem

Option Set 4—Synchronous Leased Line Applications with
Dial Restoral (Models 3261/63/66/68)

Changing Default Configuration Settings

Depending on application requirements, you may change the following options:

• The default Restoral setting in Option Set 4 (leased line models) is Auto/FP.
When first configuring the modem, set Restoral=Off. This prevents erroneous
status errors from displaying while you configure leased line options. After
configuration, if your application requires automatic initiation of dial restoral,
set Restoral=Auto/FP.

• When installing the modem in a leased line application, the default Mode
setting (AT

*

CA, MODULATION OPTS category) is Answer. For proper

operation, you must set Mode=Answer in one modem, and
Mode=Originate in the other modem.

• Depending on application requirements, you may change the following:

— Line (MODULATION OPTS). Default option is 2W Lease. Can also be

set for 4W Lease application.

— No ACU Form (ACU OPTS). Default option is Sync. Can be set to

Async.

— Answer (ACU OPTS). Default option is country-specific. Refer to

Appendix C to verify that this option is appropriate for your application.

— Restoral (RESTORAL OPTS). Default option is Auto/FP (as described

above). Can be set to Off to disable restoral.

— Clock (MODULATION OPTS). Default option is Internal. Can be set

to external or loopback, depending on the network clocking source.

— DTE (TERMINAL OPTS). If No ACU Form=Async, customize your

DTE port by selecting these options:

Set the modem’s DTE rate to match the asynchronous DTE’s rate using
DTE Rate (AT

*

DE, TERMINAL OPTS category).

Set the modem’s parity to match the parity set in the asynchronous DTE
using Parity (AT

*

RP, ACU OPTS category).

Set the modem’s character length to match the character length set in the
asynchronous DTE, using Char Length ACU OPTS category)

(Refer to Appendix A for parameter and setting descriptions.)

Configuring the Modem 4-21

Configuring

the Modem

326XFA ST-SDC Modem Application Examples

This section provides application examples for each SDC option set, and notes
options you may need to change from factory default settings for each option set.
This section includes the following:

• SDC Pre-Operation Notes—read this before configuring the modem

• Configuring The Modem for SDC Operation—configuration options that

are critical to ensure optimum network performance on an SDC connection

• SDC Sample Applications—examples of common SDC applications

SDC Pre-Operation Notes

This section contains important information for using the 326XFA S T-SDC Modem in
SDC operating mode. Read this section before configuring the unit.

Operational Requirements

• 326XFA S T-SDC modems require framed HDLC/SDLC-like data. NOTE: BER
tests do not operate in an SDC environment because the data is not framed.

• 326XFA S T-SDC modems support an NRZ or NRZI data encoding method.
Refer to the DTE documentation for information on the data encoding method
the DTE supports. (Refer to Appendix A, Data Form [AT

*

DF] option, for

details on NRZ/NRZI data encoding methods.)

Optimizing Network Performance

The 326XFA S T-SDC modem provides front panel displays of RX/TX Throughput
and Link Utilization. Higher values indicate more efficient utilization; lower values
indicate less efficient usage. These values are affected by the attached DTE and
protocol characteristics—frame size, window size, and DTE rate selected.

(Refer to Chapter 1 of the326X Series Modem Reference Guide for a description of
how to use the RX/TX Throughput and Link Utilization displays.)

Telenetics recommends the following to maximize efficiency:

• If your application is operating in a windowed protocol environment, set the
window sizes to greater than 1 to improve performance. Recall that windowing
refers to the number of packets sent before an acknowledgment is required.

• To improve network performance, adjust frame sizes. The optimum frame size
for most applications is between 128 and 1024 bytes. Experiment with window
and frame sizes for maximum performance.

• If link utilization is low, raise the DTE rate. Low link utilization typically
implies that the DTE equipment is the bottleneck in data transmission.

4-22 Configuring the Modem

Configuring

the Modem

Configuring the Modem for SDC Operation

You can configure the 326XFA S T -SDC Modem for SDC in one of these ways:

• Select Option Set 2, 3, or 4Leased, discussed below

• Configure the modem as follows:

— Select one of the reliable data transfer modes (Reliable, Auto Reliable, or

Speed Auto Reliable).

— Choose an Auto-Call Unit (ACU)—AT, V.25bis, LPDA, or None—using

the ACU Select option, ACU OPT’S category.

— Select a bit-synchronous data format (depending on the ACU type).

Refer to Appendix A for additional information on each of these methods.

Ensuring Optimum Network Performance in SDC Mode

The following parameters are critical for ensuring optimum network performance:

• Fast Call (AT

*

FC)

• DTE Rate (AT

*

DE)

• Flow (AT

*

FL)

• TpDlyMin (AT

*

TD)

Table 4-4 shows 326X-SDC option set default settings.

Carefully note the following when configuring the modem for SDC operation:

• Fas t C al l. Both modems must be configured the same in order to connect. If
one of the modems does not support Fast Call, change the default setting to Off.

• DTE Rate. For better link utilization and throughput, higher values than the
default may be appropriate. (Refer to the DTE Rate description in
Appendix A.) Refer to “Optimizing Network Performance” in the preceding
section for more information.

• Flow/TpDlyMin. The default options assume the DTE can accept
nondisruptive clock stoppage. For DTEs that cannot handle Rx/Tx clock
stoppage without disrupting data, select a different option. In this situation,
Telenetics recommends that the default values not be used.

SDC Sample Applications

SDC Option Set 1—Async Calls to Central Site Using AT ACU

SDC Option Set 1 functions the same as described above for non-SDC modems.
Refer to that section for application examples.

SDC Option Set 2—Sync Dial A/B Restoral

Single Channel Point-to-Point Digital Link Restoral (via A/B Switch)

When used as a dial backup device for a digital network, the SDC modem provides
economical dial backup and/or disaster recovery, at synchronous speeds matching
speeds available on the DDS circuit.

Configuring the Modem 4-23

Configuring

the Modem

When used as a restoral device for Telenetics and Motorola 35XX DSU/CSUs
(Figure 4-1), select SDC Option Set 2 in the local and remote SDC Modems. This
places the modems in external timing, as digital services typically provide the network
timing.

Figure 4-1. Single Channel Point-to-Point Digital Link Restoral (A/B Switch)—Option Set 2

Note the following:

• With SDC Option Set 2 selected (for Telenetics, Motorola, non-Telenetics, and
non-Motorola DSU/CSUs), the DSUs’ restoral configuration should be set to
Timing=Internal.

• In this case, the 326XFA S T-SDC DTE Rate must be set to a constant rate as
provided by the network (defaults of 56/64 kbps).

• Enable Option Set 2 in both the local and remote modems, and ensure that Mode
(AT

*

SM) is set the same in both modems.

• The SDC modem supports single channel environments only. For example, the
SDC modem can restore Port 1 only of the 35XX device.

• The 35XX device, when initiating restoral, must be set to Normal mode (as the
35XX network management channel is virtually a time division multiplexed data
stream which cannot be compressed with the SDC product).

• The SDC modem may have the ARS feature enabled. In this case, ARS
determines the link rate.

35XX

56/64 kbps

PSTN

Router

35XX

Router

To 33.6 kbps

NMS

Network Management Channel

To
56 kbps

326X

FA S T

SDC

326X

FA S T

SDC

4-24 Configuring the Modem

Configuring

the Modem

Figure 4-2 shows a configuration using an external A/B switch. Network
configuration (SDC Option Set 2) and operation is the same as with an internal
switch.

Figure 4-2. Single Channel Point-to-Point Digital Link Restoral (A/B Switch)—Option Set 2

DSU/CSU

56/64 kbps

PSTN

Router Router

To 33.6 kbps

NMS

Network Management Channel

A/B

A/B

To 56 kbps

DSU/CSU

326X

FA S T

SDC

326X

FA S T

SDC

Configuring the Modem 4-25

Configuring

the Modem

SDC Option Set 3—Sync Dial Only

In a typical dial application, a remote terminal dials the host for file transfers. This
allows remote users to dial in as needed, with a higher throughput than formerly
attainable over the PSTN. Alternately, the DTE and host (Figure 4-3) could be nodal
equipment (e.g., X.25 PADs, routers, bridges). In this configuration, the SDC
modems are used for remote dial-up branch connectivity. This is useful for remote
uploading or downloading data over the PSTN as needed.

Select SDC Option Set 3 for either of these applications.

Note the following:

• With Option Set 3, the modem provides the network timing (Clock=Internal).

• Specify the speed at which the modem communicates with the DTE using the

DTE Rate (AT

*

DE) option, to use a value other than the default. See the DTE

Rate description in Appendix A.

• With Option Set 3, the modem originates calls with its V.25bis ACU. DTR is
set to 108.1 so that an off-to-on DTR transition instructs the modem to connect
to the telephone line. If the modem detects an incoming call, the call is
connected. If the modem does not detect an incoming call and you have
enabled Default Dial (AT

*

DA), the modem dials the number specified. If the

Default Dial (AT

*

DA) is disabled, the modem refers to the Mode option

(AT

*

AC). If set to answer, the modem goes off-hook and sends an answer­back tone. An on-to-off DTR transition disconnects the modem from the
telephone line. If DTR is low, the modem does not auto-answer. DTR
transitions govern how the modem answers and disconnects calls.

• If you want the V.25bis ACU to manipulate the DTR signal, set DTR=108.2.
Other options in the ACU OPT’S category are set for a typical sync DTE.

• Select SDC Option Set 3 in both the local and remote modems, and ensure that
Mode (AT

*

SM) is set the same in both modems.

• The modem uses the adaptive rate feature in the V.34 Auto modulation mode.
This ensures maximum throughput when line quality is poor.

Figure 4-3. 326X-SDC Dial-Only Application—Option Set 3

PSTN

326X

FA S T

SDC

To 56/64 kbps

NMS

Network Management Channel

Host

DTE

326X

FA S T

SDC

4-26 Configuring the Modem

Configuring

the Modem

Bandwidth On Demand

Bandwidth on demand is often required to support sporadic peak loads. With the
SDC modem, you can ensure full network availability and performance at low dial­up line costs, without having to prioritize users or applications.

Figure 4-4 shows a point-to-point digital link with Telenetics 35XX DSU/CSUs
connecting two routers over a DDS circuit. The SDC modems are also connected
directly to the routers. During peak network access periods, the router is configured
to signal the SDC modem to establish a dial connection through the PSTN. Users
transparently bypass the digital link, using the 326XFA S T-SDC PSTN link to
continue data transmission. As bandwidth demands subside, the dial call is dropped,
and transmission resumes over the DDS link.

The SDC modem supports all industry-standard ACUs (AT, V.25bis, DTR dialing,
and LPDA-2). Bandwidth on demand can be initiated/terminated under the control of
the nodal equipment by a secondary port. NOTE: Nodal equipment must be
configured for secondary port restoral/bandwidth on demand operation. Refer to the
nodal equipment documentation for instructions on configuring for this application.

Select SDC Option Set 3 for a bandwidth on demand application. All operational
information described in the preceding section, “SDC Option Set 3—Sync Dial
Only”, applies to this application.

Figure 4-4. Bandwidth On Demand—Option Set 3

35XX

56 kbps

PSTN

Router

35XX

Router

To 33.6 kbps

NMS

Network Management Channel

To

56 kbps

326X

FA S T

SDC

326X

FA S T

SDC

Configuring the Modem 4-27

Configuring

the Modem

SDC Option Set 4—Sync Leased Line with Dial Restoral; N oACU
(Models 3261/63/66/68)

Point-to-Point Leased Line Application with Dial Restoral

Figure 4-5 shows a typical point-to-point leased line application, with SDC modems
providing leased line and dial back-up for a bridge/router network. A Telenetics
Network Management System (NMS) is shown. This application could apply to any
nodal equipment connections (e.g., bridges, routers, or X.25 PADs).

With the modem’s integral restoral capabilities, if leased circuit operation is
disrupted, the modems restore the connection over a single dial line through the
PSTN.

The modem uses the adaptive rate feature in the V.34 Auto modulation mode. This
ensures maximum throughput when line quality deteriorates. If restoral criteria are
met, the modem automatically reroutes data traffic through the PSTN. At that time,
the modem attempts to run at its maximum rate over the dial line, and falls back to
lower speeds if required. After an hour, the modem returns to the leased line.

Select SDC Option Set 4 for this application.

Note the following:

• The line configuration default of Option Set 4 is Two-Wire Leased Line.

• With Option Set 4, the modem provides the network timing (Clock=Internal).

• To specify a non-default rate at which the modem communicates with the DTE,

use the DTE Rate (AT

*

DE). See the DTE Rate description in Appendix A.

• Select SDC Option Set 4 in both the local and remote modems, and ensure that
Mode (AT

*

SM) is set the same in both modems.

• If operating with the Telenetics or Motorola 6500

PLUS

that has the Link Back­Up option, set DTR=108.2 (the default is 108.1 for 6500s without the Link
Back-Up option).

Figure 4-5. Point-to-Point Leased Line Application with Dial Restoral—Option Set 4

33.6 kbps

PSTN

Bridge/

Router

To 56/64 kbps

NMS

Network Management Channel

Bridge/

Router

326X

FA S T

SDC

326X

FA S T

SDC

4-28 Configuring the Modem

Configuring

the Modem

Remote Access Reset

Remote access reset enables someone unfamiliar with the AT command set to
quickly configure a local modem so that another modem can dial into it. Then you
can use the remote modem to configure local modem options. Remote access reset
configures the modem to:

• Answer an incoming call

• Accept a network management session

• Accept a remote configuration session initiated by the calling modem

• Disconnect a call if one is in progress

• End any test in progress

Operation

To select remote access reset, press and simultaneously for three seconds. Rmt
Access Reset displays. The modem resets itself to settings that let it answer a call

and be accessed by an NMS or remote modem. The modem may be dialed into and
reconfigured. Stored phone numbers and saved option sets remain unchanged.

When Remote Access Reset Is Disabled

Remote access reset is not supported when the modem is attached to a network
management system. If you select it in this situation, NETMAN ATTACHED!
displays. To invoke remote access reset, set OverrideMode=On (NETWK CRTL
OPT’S).

Remote access reset is not supported when the modem is password protected
(i.e., when pressing and for three seconds displays PASSWD
PROTECTED). To choose the remote access feature, you must first unlock the
modem, either from the front panel, or with the AT

*

PN (enter password)

command.

Using the AT Automatic Calling Interface 5-1

Using the

AT AC U

Chapter 5

Using the AT Automatic Calling Interface

Contents

Introduction .................................................................................................. 5-2

What is the Attention (AT) Command Set? .................................................. 5-3

What Role Does Communications Software Play? .................................. 5-3

Using AT Commands .................................................................................... 5-3

Entering AT Command Lines ................................................................... 5-3

Autobaud Feature ..................................................................................... 5-5

The Escape Sequence—(+++) ................................................................. 5-5

Non-Configuration AT Commands .......................................................... 5-6

S-Registers ............................................................................................... 5-9

5-2 Using the AT Automatic Calling Interface

Using the

AT AC U

Introduction

The 326X Series Modem supports an asynchronous AT Automatic Calling Interface
(Auto-Call Unit or ACU), that is compatible with the industry-standard AT
command set.

AT commands provide a standard modem communications interface, allowing you to
configure and operate a modem from an asynchronous terminal or PC keyboard. AT
commands define how the modem is configured, how it makes calls, and the test
operations the modem performs. In addition to supporting industry standard AT
commands, Telenetics has developed an enhanced AT command set for the modem.

• Industry-Standard AT Command Set—AT and AT&

These commands, called action AT commands, are intended for immediate
modem action and let you perform day-to-day operations, such as dialing and
storing numbers from your asynchronous DTE. These AT commands do not
cross-reference to the modem front panel.

• Telenetics Enhanced AT Command Set—AT

*

Using these Telenetics AT extensions, you can also configure most modem
options. These AT commands, called configuration AT commands, control the
same options as in your modem’s front panel menu tree.

This chapter discusses:

• The AT Command Set

• Using AT commands

• Action AT commands

• S-Registers

For an alphabetized quick-reference list of AT commands, corresponding front panel
options, and command functions, see Appendix A.

The 326X Series Modem supports two additional ACUs:

• V.25bis ACU, for asynchronous and synchronous applications

• LPDA2 ACU, for synchronous applications

For details, refer to Chapter 3 in the 326X Series Modem Reference Guide.

If you are using communications software, you normally do not use the AT
command set directly. Your communications software will do this for you.

Using the AT Automatic Calling Interface 5-3

Using the

AT AC U

What is the Attention (AT) Command Set?

The AT command set is a collection of commands that let you configure a modem
directly from an asynchronous terminal or PC keyboard. The characters AT are a
prefix to the commands you issue to your modem. When you type AT, you are asking
for the modem’s attention. For instance, to disconnect a telephone call , you type AT
for attention and H0 for on-hook (hang up).

You can also use AT commands to configure a remote modem (refer to Chapter 2,
Front Panel Operation, of the 326X Series Modem Reference Guide for details).

What Role Does Communications Software Play?

Some communications software packages “interpret” AT commands with pull-down
menus or graphics, making familiarity with the AT command syntax unnecessary.

Communications software packages that directly support the 326X Series Modem
usually support all of the modem’s AT commands (the industry standard commands
AT, AT& , and the Telenetics-enhanced commands AT

*

).

Communications software packages that support a Hayes-compatible selection do
not support the Telenetics-enhanced commands (AT

*

). You can enter these

commands yourself to modify option settings if required by your application.

Check the documentation included with your communications software package to
determine whether you need to use AT commands directly.

Using AT Commands

AT commands are accepted by the modem in command mode or escape mode.

• The modem is in command mode when it is disconnected from the
telephone line.

• You can enter escape mode and issue AT commands during a connection
(the escape sequence +++ is described later in this chapter).

Entering AT Command Lines

To enter a single AT command line:

1) Enter the prefix AT: The characters AT (upper-case or lower-case, but not
mixed) must begin the command line.

2) Enter an AT command. For example:

— D instructs the modem to dial a call. H instructs the modem to hang up. A

numeric character (for example, 2) following an AT command instructs
the modem to use a specific command option. If a numeric character is
not indicated, the modem assumes the 0 (zero) option.

3) End with a carriage return <CR>.

The exceptions to the above AT command line conventions are “A/” (repeat last
command) and “+++” (the escape sequence). Responses (result codes) to AT
commands always appear in upper-case.

5-4 Using the AT Automatic Calling Interface

Using the

AT AC U

To enter multiple AT commands on a single command line:

Multiple AT commands can be entered on a command line using a single AT prefix.
The modem accepts up to 60 characters after the prefix. Spaces are not counted in the
length. AT commands are interpreted in sequence in the command line until one of
the following occurs:

• A <CR> is encountered

• An invalid command is encountered

• A command is encountered which causes the modem to reset, go off-hook, or

enter a test state

For example, you might enter:

ATE0V1&W<CR>

on a single command line. This command disables Asynchronous Echo. It configures
the Result Code Format to Verbose, and the Save Changes feature to Option Set 1.
(These options and settings are described fully in Appendix A.)

Commands that are followed by a telephone number must be at the end of the line.
However, if the semicolon dial modifier (;) follows a telephone number, the modem
returns to command mode after dialing. Therefore, AT commands can be entered
after a semicolon in a command string. NOTE: If an error occurs, AT commands
prior to the error are executed; commands following the error are ignored.

If you enter an AT command that requires a postscript number and no number is
entered, the modem defaults to a 0 setting.

AT Command String Examples

Table 5-1 provides AT command string examples and their ACU results.

For Further Detail on AT Commands

For a description of AT commands, and dial modifiers, refer to Appendi xA.

Table 5-1.
Interpreting AT Command Strings

Command Interpretation

AT&X<CR> Postscript number needed and none is provided. 0 is assumed.

Transmitter timing is set for internal.
ATS2 No response. Needs a carriage return after the command.
GATE0<CR> Ignores everything before the AT prefix. The G is ignored. This

command disables the asynchronous echo feature.
ATS2?Q=1<CR> Multiple command line. Selects S-Register 2 as the current S-Register,

displays contents of S-Register 2, turns on result code displays, and

sets S-Register 2 to 1.

Using the AT Automatic Calling Interface 5-5

Using the

AT AC U

Autobaud Feature

The modem automatically detects the speed and character format of the following
AT commands issued from your DTE:

• AT

• at

• A/

• a/

This means that any AT command you issue to the modem will cause the modem to
“Autobaud.” The exception is the lower-case “a/” and upper-case “A/”, from which
only speed can be detected. When the a/ or A/ commands are issued, the modem
assumes parity to be the same as that of the previous command.

NOTE: Autobaud does not operate when the modem is online in escape mode.
Autobauding works at the following DTE rates (bps):

Table 5-2 summarizes the 10-bit-total character formats for autobauding.
(Autobauding is valid only with 10-bit character formats.)

Result codes, such as RING, are sent at the last autobauded DTE speed and parity.
CONNECT result codes are also sent at the last autobauded DTE speed, even if the
call is established at a different speed. When the modem is turned on, the last
autobauded speed is saved. Because parity is saved within option sets, the parity
value that is saved in the power-up option set is the one that is active.

The Escape Sequence—(+++)

The escape sequence is used when the modem is online and you need to enter
commands to the modem without disconnecting. The escape sequence with guard
time protects against losing the connection while you send commands.

NOTE: Autobaud does not operate when the modem is in escape mode.
Once in command state, you can:

• Terminate a call

• Initiate and terminate a test

• Issue AT action commands

• Change your modem’s configuration

• Initiate a remote configuration session

• Read modem status using the AT

*

ST command

300 1200 2400 4800 7200 9600
12,000 14,400 16,800 19,200 21,600 24,000
26,400 28,800 38,400 57,600 115,200

Table 5-2.
Valid Autobauding Character Formats

Start Bit Data Bits Parity Stop Bits

1 7 Even or Odd 1
17None 2
1 7 Mark or Space 1
18None 1

5-6 Using the AT Automatic Calling Interface

Using the

AT AC U

The escape state is entered by sending the escape character three consecutive times.
The escape character is selectable as any ASCII character. Its value is stored in
S-Register 2, and the default is “+” (decimal 43). To disable escape command
detection, set S-Register 2 to a value greater than 127.

A guard time is used with the escape sequence. A guard time must precede and
follow the sequence of escape characters to prevent the +++ characters from
inadvertently placing the modem into command mode if they are transmitted in a
message. If data is sent within the guard time, the escape sequence is not detected.
The default guard time is one second.

The guard time specified by S-Register 12 also specifies the maximum time between
the three consecutive escape characters. If more than the allowable time elapses
between escape characters, the escape sequence is ignored. Setting S-Register 12 to
zero disables the guard time, so that the rate at which you enter the escape sequence
is not a factor.

To use the escape sequence with guard time:

1) Pause a bit longer than the guard time.

2) Send +++, ensuring the delay between +’s is less than the specified guard

time.

When a valid escape sequence is detected, the modem responds with

OK

Do not send commands until the OK response has been received. A command
that is sent too soon may not be interpreted correctly.

3) Pause again, a bit longer than the guard time.

4) Enter commands to the modem.

5) When you are ready to resume the call to the remote system, type ATO<CR>.

The modem returns to the online state.

When using error correction, if you “escape” from the data state to the command
state, the modem buffers any data received from the remote site. When you return
online (to data state), the buffered data is sent to the DTE.

Non-Configuration AT Commands

Most AT commands cross-reference to a front panel option. Some AT commands are
intended only for immediate modem action. These commands allow you to perform
a number of the important day-to-day modem functions, such as:

• Re-execute your last command

• Answer an incoming call

• Dial a telephone number

• Hang up

• Exit command mode, return to data mode

• Redial the last telephone number

Using the AT Automatic Calling Interface 5-7

Using the

AT AC U

This section addresses AT commands that do not cross-reference to a front panel
option.

A/, Re-Execute Last Command

This command re-executes the last AT command string issued to the modem,
including redialing a telephone number. To re-execute the last command, enter A/
but do not follow this command with <CR>.

The A/ command may be entered in either uppercase or lowercase characters.
However, when entered in lowercase characters, the modem cannot use the autobaud
feature to determine parity. The modem continues to use the parity determined by the
previous command. The AT

*

ZD (Dial Rstrct) AT command limits the A/ command.

The modem does not support auto-parity for this command.

ATA, Manual Answer

This command instructs the modem to go off-hook and send answer-back tone over
the line. When the ATA command is used during an incoming call, the modem
initiates the “answer” end of the modulation mode handshake sequence. DSR
transitions from off to on when the answer-back tone is sent if DSR is not configured
for the High setting. If the modem is using error correction, the error-correction link
handshake takes place after the modulation mode handshake, and before DCD
(if DCD is not configured for the High setting) transitions from off to on.

This command causes the modem to answer a call regardless of the contents of
S-Register 0 (Ring Count to Answer On).

If the ATA command is issued while the modem is in escape mode or in remote
configuration, the modem responds with:

ERROR

ATD , D ia l

To dial directly from the keyboard, enter ATD followed by the number you want to
dial. For example:

ATD1-617-555-1212<CR>

The ATD command causes the modem to go off-hook, dial the number, and execute
all dial modifiers in the dial string. The type of call progress message you see is
controlled by the Call Progress (ATX) setting. The modem can dial up to 50
characters, including spaces.

In originate mode, if the ATD command is issued without a phone number, the
modem goes off-hook.

Settings:

Not applicable

Fo r m a t:

A/

Settings: Not applicable

Fo r m a t:

ATA < C R >

5-8 Using the AT Automatic Calling Interface

Using the

AT AC U

If ATD is issued while the modem is in escape mode or remote configuration, the
modem responds with:

ERROR

NOTE: Any invalid characters inserted into the dial string will be ignored.

ATH, Hang Up

You may hang up the modem after entering the online escape mode by typing ATH
or ATH0. Typing ATH1 while in command mode causes the modem to Busy Out
until either the ATH command is entered or the key is pressed. NOTE: For busy
out, make certain that the TELCO OPT’S Telco option is set for RJ4MB.

ATI, Display Software Information

The messages described above are displayed in addition to the “OK” sent when AT
command processing is complete. NOTE: If this command is the last or only
command in a command line, an additional “OK” message follows the above
responses.

ATO, Leave Command Mode

This command can be used only when the modem is in the online escape mode, or
after a “;” (semicolon) dial modifier in a dial string.

The user may leave escape mode and return to data mode by typing ATO or ATO0.
If a retrain is desired while returning to data mode, ATO1 must be used.

If this command is issued while the modem is disconnected from the phone line, the
modem responds with:

NO CARRIER

If this command is issued while the modem is in a remote configuration session, the
modem responds with:

ERROR

NOTE: If the ATO command is issued after a “;” (semicolon) dial modifier (return
to command state after dialing), the modem trains as an originate modem.

Settings:

0, Modem hangs up
1, Busy Out the modem

Fo r m a t:

AT H n < C R >

Settings:

0, Displays 960
1, Displays 000
2, Displays OK
9, Displays reason for last disconnect

Fo r m a t:

AT I n < C R >

Settings:

0, Leave command mode and return online
1, Leave command mode, return online, and initiate a retrain

Fo r m a t:

AT 0 n < C R >

Using the AT Automatic Calling Interface 5-9

Using the

AT AC U

AT*RD, Redial Last Number

You may redial a failed call n times using the AT*RD command. The modem
redials a call until a successful connection is made, or until the call has been
attempted n times. The AT

*

RD command causes the modem to redial the last
number dialed. So if an initial call fails, and the telephone number is linked to
another number, the modem redials the linked telephone number.

S-Registers

S-registers are memory locations for storing specific configuration and operating
parameters. S-registers typically contain timing, counting, ASCII characters, or
command option values. While communications software generally insulates you
from the need to alter S-register settings, you may want to reconfigure or read the
contents of an S-register. This section describes how to read and change S-Register
values.

This section is in two parts:

• The first part describes the AT commands used to display and change
S-Register values.

• The second part describes S-Registers used by the modem.

Any S-Register that is not stored in memory is reset to its default value when you:

• Power up the modem

• Load a new Option Set

• Reinitialize memory

Displaying and Changing S-Register Values

Display S-Register Value (ATSn?)

This command displays the value of S-Register n, as stored in volatile memory.

If a “?” appears in the command string anywhere other than immediately following
the S-Register number, the command displays the value of the last S-Register
selected.

If you try to read the value of an unused S-Register, the modem displays OK.

Settings:

0, 1 Redial last number one time.

n (The maximum number of redials allowed is country-specific. See the
326X Series Modem Country-Specific Guide

for more details).

Fo r m a t:

AT

*

RDn<CR>

Settings:

n, Specifies S-Register

Fo r m a t:

AT Sn?<CR>

5-10 Using the AT Automatic Calling Interface

Using the

AT AC U

Display S-Register Value (AT?)

This command displays the contents of the “selected” S-Register, as stored in volatile
memory. The “selected” S-Register is the last S-Register that was accessed using an
S-Register command or the ATSn command. The number must be within the
S-Register’s specified range. On power-up, S-Register 0 is “selected.”

If you try to read the contents of an unused S-Register, the modem displays OK.

Change S-Register Value (ATSx=n)

This command lets you change the value of an S-Register stored in volatile
memory. n is the S-Register to change, and x is the value. x must be a number
within the S-Register’s range.

If you try to change the value of an unused S-Register, the modem displays OK.

Change S-Register Value (AT=x)

This command lets you change the value of an S-Register stored in volatile memory.
The “selected” S-Register is the last S-Register that was accessed using an
S-Register command or the ATSn command. x must be a number within the specified
range for the S-Register. On power-up, S-Register 0 is “selected.”

If you try to change the value of an unused S-Register, the modem displays OK.

S-Register Descriptions

S-Register 0—Ring Count to Answer On

This S-Register specifies the ring on which the modem automatically answers a call.
When set to 0, automatic answering is disabled, and calls must be answered manually.
This register has no meaning unless Answer=Using S0 (ACU OPT’S).

Settings:

Selected S-Register

Fo r m a t: AT ? < C R >

Settings: n

, Specifies S-Register

x

, Specifies value of S-Register

Fo r m a t:

AT Sn=x<CR>

Settings: x

, Specifies value of selected S-Register

Fo r m a t:

AT =x<CR>

Stored in Nonvolatile Memory?:

Ye s

Status-Only?:

No

Default Setting:

0

Range:

0 to 255

Using the AT Automatic Calling Interface 5-11

Using the

AT AC U

S-Register 1—Ring Count

This S-Register counts the number of rings in an incoming telephone call. If the
modem is configured to answer (AT

*

AA, or Answer=S0), when S-Register 1’s
value equals S-Register 0’s value, the modem answers the call. If no ring is received
after a country-specific time (eight to 10 seconds), the counter is reset to 0.

S-Register 2—Escape Code Character

This S-Register determines the decimal value of the escape code character.
The default setting, 43, translates to the ASCII “+” character. Values greater than 127
disable the escape function.

S-Register 3—Carriage Return Character

This S-Register determines the decimal value of the carriage return character.
The default setting, 13, translates to the ASCII <CR> (carriage return) character.

S-Register 4—Line Feed Character

This S-Register determines the decimal value of the line feed character. The default
setting, 10, translates to the ASCII <LF> (line feed) character.

Stored in Nonvolatile Memory?: No

Status-Only?: Ye s

Default Setting:

0

Range:

0 to 255

Stored in Nonvolatile Memory?:

Ye s

Status-Only?:

No

Default Setting: 43

Range:

0 to 255

Stored in Nonvolatile Memory?: No

Status-Only?:

No

Default Setting: 13

Range:

0 to 127

Stored in Nonvolatile Memory?:

No

Status-Only?:

No

Default Setting:

10

Range:

0 to 127

5-12 Using the AT Automatic Calling Interface

Using the

AT AC U

S-Register 5—Backspace Character

This S-Register determines the decimal value of the backspace character. The default
setting, 08, translates to the ASCII <BS> (backspace) character. Values greater than
32 (except 127) disable the backspace function.

S-Register 6—Wait for Dial Tone

If Call Progress is set to 0, 1, or 3 (ATX0, ATX1, ATX3), and blind dial is selected,
the modem does not look for a dial tone. Instead, the modem goes off-hook and waits
for the number of seconds specified by S-Register 6 before blind dialing a telephone
number (if Blind Dial is set to S6, AT

*

BD2). This S-Register does not affect the

wait dial modifiers W, w, or :.

S-Register 7—Wait for Data Carrier

If Call Timeout (AT

*

TT) is set to S7, the value of S-Register 7 determines the
number of seconds that the modem waits for a carrier signal from the remote modem
after dialing or answering a call.

S-Register 7 also affects the dial modifiers @, W, w, and :.

Dial Modifier “@”

If Call Timeout (AT

*

TT) is set to S7, the value of S-Register 7 determines the
length of time for which the @ dial modifier instructs the modem to detect five
seconds of silence.

Dial Modifier “W”, “w”, and “:”

If the Dial Wait option (AT

*

DD) is set to S7, the value of S-Register 7 determines
the value of the dial wait modifier. The dial wait modifier determines how long the
modem waits for a second dial tone after the modem has dialed a number.

Stored in Nonvolatile Memory?: No

Status-Only?: No

Default Setting:

8

Range:

0 to 127

Stored in Nonvolatile Memory?:

Ye s

Status-Only?:

No

Default Setting:

2

Range: 1 to 255 (seconds)

Stored in Nonvolatile Memory?:

Ye s

Status-Only?:

No

Default Setting:

30

Range:

1 to 255 (seconds)

Using the AT Automatic Calling Interface 5-13

Using the

AT AC U

S-Register 8—Pause Time for Pause Delay Dial Modifiers

This S-Register determines how many seconds the modem pauses while dialing
when it encounters a K, k, “,”, or < dial modifier. Pause Delay (AT

*

DP) must be set

to S8 (AT

*

DP4) to use S-Register 8’s setting.

This S-Register also determines the time duration of the pause delay for the “,”
character when used in an AT command string. The modem pauses for the specified
time before continuing to process the command string.

With the “,” k, K, or < dial modifier, if S-Register 8 is set to 0 or 1, the pause delay
defaults to two seconds.

S-Register 10—Carrier Loss Hang Up Delay

S-Register 10 determines how long, in 100 millisecond increments, data carrier must
be lost before the modem hangs up. NOTE: This applies to V.22bis, B212, V.21, and
B103 operation only. To use S-Register 10’s setting, the front panel DCD Loss Dis
option (AT

*

CD) must be set to S10. Also, if S-Register 10 is set to 255, the modem

will not hang up because of a carrier loss.

Setting the AT

*

CD (DCD Loss Disconnect option under the TERMINAL OPT’S
menu) to S10 enables the DCE disconnect feature, for V.32, V.32bis, and V.34
modulation modes. For these modes, the S-Register 10 determines the length of time,
in seconds, for the modem to disconnect when the remote modem goes on hook
without sending a longspace or PSTN cleardown.

In Normal or Direct modes, S10 must be set between 1–9 seconds. For Reliable
mode, S10 must be set between 1–8 seconds. These selections result in Disconnect in
the specified time after the modem leaves data mode and starts to retrain. Values of
S10 other than the ones specified above disable the DCE Disconnect feature.

Stored in Nonvolatile Memory?: Ye s

Status-Only?: No

Default Setting:

2

Range:

0 to 255 (seconds)

Stored in Nonvolatile Memory?:

Ye s

Status-Only?:

No

Default Setting:

15

Range:

1 to 255

5-14 Using the AT Automatic Calling Interface

Using the

AT AC U

S-Register 11—DTMF Tone Duration

S-Register 11 defines the duration/spacing of tones (in milliseconds) in Dual Tone
Multifrequency (DTMF) dialing. This register has no meaning unless the Tone
Length option under the DIALING OPT’S is set to S11. Refer to Appendix C,
Country-Specific Information, for the ranges supported by each country.

S-Register 12—Escape Code Guard Time

This S-Register sets the interval that must be present on either side of the escape
code (+++) in order for the modem to recognize the escape command and enter
command mode. This prevents the +++ characters from putting the modem in
command mode if they are contained in data. The value of S-Register 12 is
multiplied by 0.02 to determine the number of seconds. For example, the value of the
factory default 50 is one second.

If S-Register 12 is set to 0, the speed at which you enter the escape sequence is not a
factor.

S-Register 18—Test Timer

This S-Register determines the duration, in seconds, of loopback tests.
With S-Register 18 set to 0, the timer is not operational and tests must be terminated
manually. NOTE: S-Register 18’s function is valid only when loopback tests are
issued using the AT&T command. S-Register 18 cannot be used to automatically
terminate loopback tests if the test is initiated from the front panel.

Stored in Nonvolatile Memory?: Ye s

Status-Only?: No

Default Setting:

72

Range:

50 to 255 (country-specific)

Stored in Nonvolatile Memory?:

No

Status-Only?:

No

Default Setting: 50 (1 second)

Range:

0 to 255

Stored in Nonvolatile Memory?:

Ye s

Status-Only?:

No

Default Setting:

0

Range:

0 to 255 (seconds)