General DataComm SpectraComm V.34 User manual

The Best Connections in the Business
General DataComm
6SHFWUD&RPP
V.34 Dual Modem
Installation & Operation Manual
060R122-000
Issue 15
May 2012

Copyright
©2012 General DataComm, Inc. ALL RIGHTS RESERVED.
This publication and the software it describes contain proprietary and confidential information. No part of this
document may becopied, photocopied, reproduced, translated or reduced to any electronic or machine-readable
format without prior written permission of General DataComm,Inc. The information in this document is subject
to change without notice. General DataComm assumes no responsibility for any damages arising from the use
of this document, including but not limited to, lost revenue, lost data, claims by third parties, or other damages.
If you have comments or suggestions concerning this manual, please contact:
General DataComm, Inc. Technical Publications
6 Rubber Avenue, Naugatuck, Connecticut USA 06770
Telephone: [phone]
Trademarks
All brand or product names are trademarks or registered trademarks of their respective companies or
organizations.
Documentation
Revision History - GDC/P/N 060R122-000
Related Publications
-REV is the hardware revision (-000,-001, etc.)
-VREF is the most current software version (-V600 is Version 6.0.0.)
In addition to the publications listed above, always read Release Notes supplied with your products.
Issue Number Date Description of Change
1 - 4 -- Initial Release and Updates
5 November 1999 Revised to firmware Version 5.0.3.0
6 May 2001 Updated and added RADIUS support
7 April 2002 Minor corrections and updates
8 January 2004 Corrections to AT command tables
9 September 2004 Added Encryption option and associated AT commands
10 June 2005 Corrections and clarifications to Steadfast Security; Updates to
AES Encryption option and associated AT commands.
11 Feburary 2006 Added Secure Access Modem Authenticaton option (SAM)
12 June 2007 Clarify SAM PIN/ID syntax; Clarify S-Register AT commands.
13 May 2008 Clarify S-Register Command ATS2.
14 February 2010 Update standalone enclosures.
15 May 2012 Minor updates/enclosure branding
Description Part Number
SpectraComm/UAS Installation & Operation for Shelf/Enclosure 010R302-REV
SpectraComm 2000 Shelf Installation and Operation 010R358-REV
SpectraComm 1001/1002 Enclosure Installation and Operation 010R112-REV
SpectraComm Manager Card Installation and Operation 048R303-REV
TEAM Core Software Operation Manual 058R720-REV
Compatible product cards and TEAM software application manuals Refer to GDC Publications
CD or www.gdc.com

060R122 -000 GDC SpectraComm Dual V.34 Modem i
Issue 15 Installation and Operation
Table of Contents
Preface
Safety Information ................................................................................................................... vi
Compliance ............................................................................................................................. vii
Support Services and Training................................................................................................. xi
Corporate Client Services...................................................................................................xi
Factory Direct Support & Repair .......................................................................................xi
Contact Information ...........................................................................................................xi
Chapter 1: System Description
Diagnostic Testing............................................................................................................1-3
Dual V.34 Modem Software.............................................................................................1-3
Shelf / Enclosure Options.................................................................................................1-4
Security Solutions.............................................................................................................1-5
Equipment List....................................................................................................................... 1-8
Technical Specifications...................................................................................................... 1-10
Chapter 2: Installation
Unpacking the Modem.....................................................................................................2-1
Installation Guidelines......................................................................................................2-1
Setting Option Jumpers ....................................................................................................2-2
Installing the Dual V.34 Modem......................................................................................2-4
Making Cable Connections ..............................................................................................2-4
Special Considerations for High Data Rates....................................................................2-7
Verifying Your Connections ............................................................................................2-8
Chapter 3: Operation
Dual V.34 Front Panel ........................................................................................................... 3-2
Call Control Basics ................................................................................................................ 3-3
Call Initiation Examples...................................................................................................3-4
Completing a Connection.................................................................................................3-5
Call Answering.................................................................................................................3-5
Security Overview.................................................................................................................. 3-7
SteadFast Password Security..........................................................................................3-11
Online Password Security...............................................................................................3-12
RADIUS Security (Remote Authentication Dial-In User Service)................................3-14
AES Encryption Security ...............................................................................................3-15

ii SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15
Table of Contents
Secure Access Modem Authentication Option..............................................................3-16
Message Flow ................................................................................................................3-20
Command Mode Overview ................................................................................................. 3-21
AT Commands............................................................................................................... 3-22
Configuration Profiles....................................................................................................3-23
Remote Configuration Using the AT Commands.......................................................... 3-23
Remote Configuration Using an MMS Controller.........................................................3-25
Data Mode Overview........................................................................................................... 3-26
Asynchronous Operation..................................................................................................... 3-27
Error Correcting Modes.................................................................................................3-27
Non-Error Correcting Modes.........................................................................................3-30
Flow Control.................................................................................................................. 3-31
Synchronous Operation ....................................................................................................... 3-32
Synchronous Operating Modes......................................................................................3-32
Asynchronous Dialing with Synchronous Transmission...............................................3-32
Direct Dialing in Synchronous Mode ............................................................................3-32
Normal Synchronous Mode...........................................................................................3-32
V.13 Synchronous Mode................................................................................................ 3-33
Synchronous Compression Mode ..................................................................................3-33
Clock Selection ..............................................................................................................3-34
Switched Network Operation .............................................................................................. 3-35
Telephone Lines.............................................................................................................3-35
Private Line Operation......................................................................................................... 3-36
Two-wire Setup.............................................................................................................. 3-36
Private Line Configuration.............................................................................................3-36
Transmit Level...............................................................................................................3-36
Automatic and Manual Handshaking.............................................................................3-37
Terminal Interface Overview............................................................................................... 3-38
Initiating a Terminal Interface Session.......................................................................... 3-38
Selecting a Unit (Shelf Inventory Screen) ....................................................................3-39
Modem Main Menu............................................................................................................. 3-40
AT Session Terminal Interface Screen ..........................................................................3-40
Alarms Terminal Interface Screen.................................................................................3-43
Call Statistics Terminal Interface Screen.......................................................................3-44
DTE Status Terminal Interface Screen ..........................................................................3-45
Chapter 4: AT Command Set Operation
AT Command Guidelines ................................................................................................ 4-1
AT Command Setup......................................................................................................... 4-2
AT Command Reference Tables ........................................................................................... 4-3

060R122-000 SpectraComm Dual V.34 Modem iii
Issue 15 Installation and Operation
Table of Contents
AT Command Details .......................................................................................................... 4-22
&Fn Fixed Configuration Profiles..................................................................................4-23
\Vn Connect Messages..................................................................................................4-27
Chapter 5: V.25 bis Command Set Operation
V.25 bis Protocol Overview................................................................................................... 5-1
V.25 bis Operating Modes................................................................................................5-2
Commanding the Modem....................................................................................................... 5-3
V.25 bis Configuration Commands..................................................................................5-4
V.25 bis Communication Commands...............................................................................5-7
ITU-T V.25 bis Command Procedures.................................................................................. 5-9
108.2 Mode Operating Procedures:..................................................................................5-9
108.1 Mode Operating Procedures.................................................................................5-11
V.25 bis 108.2 Mode Interface Specifications..................................................................... 5-12
Interface Connections.....................................................................................................5-12
Synchronous Format Selection.......................................................................................5-13
Asynchronous Format ....................................................................................................5-14
Modem Test Modes........................................................................................................5-14
Chapter 6: Tests
Analog Loopback (ANALOOP)............................................................................................ 6-2
Analog Loopback with Self-Test........................................................................................... 6-4
Digital Loopback.................................................................................................................... 6-6
Remote Digital Loopback...................................................................................................... 6-7
Remote Digital Loopback with Self-Test .............................................................................. 6-8
End-to-End Self-Test ............................................................................................................. 6-9
RDLB Requests.................................................................................................................... 6-10
Appendix A:ASCII Character Set

iv SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15
Table of Contents

060R122-000 SpectraComm Dual V.34 Modem v
Issue 15 Installation and Operation
Preface
Scope
This manual describes how to install and operate the SpectraComm Dual V.34 Modem. The
information contained in this manual has been carefully checked and is believed to be entirely
reliable. However, as General DataComm improves the reliability, function, and design of their
products, it is possible that information may not be current. Contact General DataComm if you
require updated information for this or other General DataComm products.
General DataComm, Inc.
6 Rubber Avenue
Naugatuck, Connecticut, USA 06770
Tel: [phone] Toll Free: 1 800 523-1737
Manual Organization
This manual is divided into the following chapters. When using the digital version of this manual,
click on any link (shown in blue text) to jump to that section.
Chapter 1, System Description
Chapter 2, Installation
Chapter 3, Operation
Chapter 4, AT Command Set Operation
Chapter 5, V.25 bis Command Set Operation
Chapter 6, Tests
Appendix A, ASCII Character Set

Preface Safety Information
vi SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15
Safety Information
This manual should be read in its entirety and all procedures completely understood before
installing or operating the unit, including all notes, cautions and warnings (examples below). The
CAUTION, WARNING, and DANGER statements that appear throughout this manual are
intended to provide critical information for the safety of both the service engineer and operator.
These statements also enhance equipment reliability. The following definitions and symbols for
CAUTION, WARNING, and DANGER as they are used comply with ANSI Z535.2, American
National Standard for Environmental and Facility Safety Signs, and ANSI Z535.4, Product Safety
Signs and Labels, issued by the American National Standards Institute.
Safety Guidelines
• Always use caution and common sense, especially when unsafe conditions or potentially
hazardous voltages are present.
• Repairs must be performed by qualified service personnel only.
• To reduce the risk of electrical shock, do not operate equipment with the cover removed.
• Never install telephone jacks in a wet location unless the jack is designed for that location.
• Never touch uninsulated telephone wires or terminals unless the telephone line is
disconnected at the network interface.
• Never install telephone wiring during an electrical storm.
Antistatic Precautions
This product may containstatic-sensitive devices that are easily damaged by electrostatic discharge
(ESD). ESD occurs when a person whose body has built up static electricity touches a computer
component. ESD can cause computer components to fail. Take proper handling, grounding and
precautionary ESD measures installing parts or cards. Keep parts and cards in antistatic packaging
when not in use or during transport. If possible, use antistatic pads on floor and workbench.
Whenhandlingcomponents,alwaysuseanantistaticwriststrapconnectedto agroundedequipment
frame or chassis. If a wrist strap is not available, periodically touch an unpainted metal surface on
the equipment. Never use a conductive tool, like a screwdriver or a paper clip, to set switches.
Note A note provides special instructions, helpful tips or a general rule. A note is typically a suggestion.
Note IMPORTANT! indicates a note that provides essential operating information you should be particularly
aware of. Important notes are typically strong recommendations.
CAUTION indicates conditions or practices which can cause damage to equipment or loss
of data.
WARNING indicates a potentially hazardous situation which, if not avoided,
may result in minor to moderate injury. It may also be used to alert against unsafe practices.
DANGER indicates an imminently hazardous situation which, if not avoided,
will result in death or serious injury.

Preface Compliance
060R122-000 SpectraComm Dual V.34 Modem vii
Issue 15 Installation and Operation
Compliance
FCC Part 68 Compliance
This equipment complies with Part 68 of the FCC rules. On the middle backplane connector of the
SpectraComm Dual V.34 is a label that contains, among other information, the FCC registration
number and the Ringer Equivalence Number (REN) for this equipment. If requested, this
information must be provided to the telephone company.
FCC Registration Number: AG6USA-23772-MM-E
Facility Interface Codes: 02LS2
Service Order Code: 9.0Y
Telephone Company Jack Type: RJ45S
All connections to the telephone company must be made using standard plugs and telephone
company-provided jacks or equivalent. A plug and jack used to connect this equipment to the
premises wiring and telephone network must comply with the FCC Part 68 rules and regulations
adoptedby the ACTA. A compliant telephone cord and modular plug is provided with this product.
The plug is designed to be connected to a compatible modular jack that is also compliant. Please
see installation instructions for details.
The REN is used to determine the number of devices that may be connected to a telephone line.
Excessive RENs on a telephone line may result in the SpectraComm Dual V.34 not answering in
response to an incoming call. In most but not all areas, the sum of RENs should not exceed five
(5.0). To be certain of the number of devices that may be connected to a line, as determined by the
total RENs, contact the telephone company.
If the SpectraComm Dual V.34 causes harm to thetelephone network, the telephone company will
notify you in advance that temporary discontinuance of service may be required. If advance notice
is not practical, the telephone company will notify the customer as soon as possible. You will be
advised of your right to file a compliant with the FCC if you believe it is necessary.
The telephone company may from time to time make changes in its facilities, equipment, operations
or procedures that could affect the operation of the SpectraComm Dual V.34. If this happens the
telephone company will provide advance notice in order for you to make necessary modifications
to maintain uninterrupted service.
If trouble is experienced with the SpectraComm Dual V.34, for repair or warranty information,
please contact General DataComm, Inc. at [phone]. If the equipment is causing harm to the
telephone network, the telephone company may request thatyou disconnect the equipment from the
network until the problem is resolved. All repairs or modifications to the equipment must be
performed by General DataComm. Any other repair or modification by a user voids the FCC
Registration and the product warranty.
Connection of this equipment to party lines and coin-operated telephones is prohibited. Connection
to party line service is subject to state tariffs. Contact the state public utility commission, public
service commission or corporate commission for information.
If your premises has specially wired alarm equipment connected to the telephone line, ensure the
installation of the SpectraComm Dual V.34 does not disable your alarm equipment. If you have
questions about this, consult your telephone company or qualified installer.

Preface Compliance
viii SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15
The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to use a
computer or other electronic device, including FAX Machines, to send any message unless such
message clearly contains the following information:
• Date and time the message was sent.
• Identification of the business or the other entity, or other individual sending the message.
• Telephone number of the sending machine or such business, or other entity, or individual.
This information is to appear in a margin at the top or bottom of each transmitted page or on the
first page of the transmission (Fax Branding). Since any number of fax software packages can be
used with this product, the user must refer to the fax software for setup details.
Part 15 Compliance
This device complies with Part 15 of the FCC rules. Operation is subject to the following two
conditions:
1. This device may not cause harmful interference and
2. This device must accept any interference received, including interference that may cause
undesired operation.
Industry Canada Notification
The Industry Canada label identifies certified equipment. This certification means that the
equipment meets telecommunications network protective, operation and safety requirements as
prescribed in the appropriate Terminal Equipment Technical Requirements document(s). The
Department does not guarantee the equipment will operate to the user's satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the
facilities of the local telecommunications company. The equipment must also be installed using an
acceptable method of connection. The customer should be aware that compliance with the above
conditions may not prevent degradation of service in some situations.
Repairsto certifiedequipment should be coordinated by a representative designated bythe supplier.
Any repairs or alterations made by the userto this equipment, or equipment malfunctions, may give
the telecommunications company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of the power
utility, telephone lines and internal metallic water pipe system, if present, are connected together.
This precaution may be particularly important in rural areas.
Caution: Users should not attempt to make such connections themselves, but should contact the
appropriate electric inspection authority, or electrician, as appropriate.
Notice: The Ringer Equivalence Number (REN) assigned to each terminal device provides an
indication of the maximum number of terminals allowed to be connected to a telephone interface.
The termination on an interface may consist of any combination of devices subject only to the
requirement that the sum of the Ringer Equivalence Numbers of all the devices does not exceed 5.

Preface Compliance
060R122-000 SpectraComm Dual V.34 Modem ix
Issue 15 Installation and Operation
Avis D’industrie Canada
L’étiquette d’Industrie Canada identifie le matériel homologué. Cette étiquette certifie que le
matériel est conforme aux normes de protection, d’exploitation et de sécurité des réseaux de
télécommunications, comme le prescrivent les documents concernant les exigences techniques
relatives au matériel terminal. Le Ministère n’assure toutefois pas que le matériel fonctionnera à la
satisfaction de l’utilisateur.
Avant d’installer ce matériel, l’utilisateur doit s’assurer qu’il est permis de le raccorder aux
installations de l’entreprise localede télécommunication.Le matériel doit également être installé en
suivant une méthode acceptée de raccordement. L’abonné ne doit pas oublier qu’il est possible que
la comformité aux conditions énoncées ci-dessus n’empêche pas la dégradation du service dans
certaines situations.
Les réparations de matériel homologué doivent être coordonnées par un représentantdésigné par le
fournisseur. L’entreprise de télécommunications peut demander à l’utilisateur de débrancher un
appareil à la suite de réparations ou de modifications effectuées par l’utilisateur ou à cause de
mauvais fonctionnement.
Pour sa propre protection, l’utilisateur doit s’assurer que tous les fils de mise à la terre de la source
d’énergie électrique,des lignestéléphoniques etdescanalisationsd’eaumétalliques, s’ilyen a, sont
raccordés ensemble. Cette précaution est particulièrement importante dans les régions rurales.
Avertissement: L’utilisateur ne doit pas tenter de faire ces raccordements lui-même; il doit avoir
recours à un service d’inspection des installations électriques, ou à un électricien, selon le cas.
Avis: L’indice d’équivalence de la sonnerie (IES) assigné à chaque dispositif terminal indique le
nombre maximal de terminaux qui peuvent être raccordés à une interface. La terminaison d’une
interface téléphonique peut consister en une combinaison de quelques dispositifs, à la seule
condition que la somme d’indices d’équivalence de la sonnerie de tous les dispositifs n’excède
pas 5.
Electromagnetic Compatibility
This Class A digital apparatus complies with Canadian ICES-003.
La Compatibilité d’ Eléctro-magnetique
Cet appareil numerique de la classe A est conforme a la norme NMB-003 du Canada.

Preface Compliance
x SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15
Deutschland
Installations Anweisungen: Installieren Sie die Telefonleitungen nicht während eines Gewitters.
Installieren Sie die Telefonleitungen nicht in einem feuchten Raum, auβer die Dose entspricht den
Vorschriften für Feuchträume. Berühren Sie unisolierte Telefonleitungen oder Einrichtungen nicht,
auβer diese sind vom Telefonnetz getrennt. Vorsicht bei der Installierung oder Änderung von
Telefonleitungen. Achtung: Es gibt keine durch den Benutzer zu wartende Teile im Gerät. Wartung
darf nur durch qualifiziertes Personal erfolgen.
EC Declaration of Conformity
We: General DataComm Inc.
6 Rubber Avenue
Naugatuck, CT 06770, U.S.A.
Declare under our sole responsibility that the SpectraComm Dual V.34 modem is in conformity
with the following standards or other normative documents:
EN 55022: 1994
Specification for limits and methods of measurement of radio interference characteristics of
information technology equipment.
EN 50082-1: 1992
Generic immunity standard Part 1 Residential, Commercial, and Light Industry, following the
provisions of the Electromagnetic Directive, 89/336/EEC.
Safety
EN 60950: 1995 A1 through A3
Safety or Information Technology Equipment, following the provisions of the Low Voltage Directive,
73/23/EEC.
Communications
CTR 15
CTR 17
Following the provisions of the Telecommunications Terminal Equipment Directive, 98/13/EEC.
NEBS Compliance
Certified by independent labs for NEBS compliance to standards:
GR63 - Physical Protection
GR1089 - EMC and Safety

Preface Support Services and Training
060R122-000 SpectraComm Dual V.34 Modem xi
Issue 15 Installation and Operation
Support Services and Training
GeneralDataCommofferstwocomprehensive customersupportorganizations dedicatedtopre-and
post-sale support services and training for GDC products. Corporate Client Services and Factory-
Direct Support & Repair assist customers throughout the world in the installation, management,
maintenance and repair of GDC equipment. Located at GDC’s corporate facility in Naugatuck,
Connecticut USA, these customer support organizations work to ensure that customers get
maximum return on their investment through cost-effective and timely product support.
Corporate Client Services
Corporate Client Services is a technical support and services group that is available to GDC
customers throughout the world for network service and support of their GDC products. Customers
get thereliable support and training required for installation,managementand maintenance of GDC
equipment in their global data communication networks. Training courses are available at GDC
corporate headquarters in Naugatuck, Connecticut, as well as at customer sites.
Factory Direct Support & Repair
GDC provides regularand warranty repair services through Factory Direct Support & Repair at its
U.S. headquarters in Naugatuck, Connecticut. This customer support organization repairs and
refurbishes GDC products, backed by the same engineering, documentation and support staff used
to build and test the original product. Every product received for repair at Factory Direct Support
& Repair is processed using the test fixtures and procedures specifically designed to confirm the
functionality of all features and configurations available in the product.
As part of GDC’s Factory Direct program, all product repairs incorporate the most recent changes
and enhancements from GDC Engineering departments, assuring optimal performance when the
customer puts the product back into service. Only GDC’s Factory Direct Support & Repair can
provide this added value.
Contact Information
General DataComm, Inc.
6 Rubber Avenue
Naugatuck, Connecticut 06770 USA
Attention: Corporate Client Services
Telephones: 1 800 523-1737
1 203 729-0271
Fax: [phone] or 1 203 729-3014
Email: c[email protected]m
General DataComm, Inc.
6 Rubber Avenue
Naugatuck, Connecticut 06770 USA
Attention: Factory Direct Support & Repair
Telephones: 1 800 523-1737
1 203 729-0271
Fax: [phone]
Email: [e-mail]
Hours of Operation:
Monday - Friday 8:30 a.m. - 5:00 p.m. EST
(excluding holidays)
http://www.gdc.com

Preface Support Services and Training
xii SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15

060R122-000 SpectraComm Dual V.34 Modem 1-1
Issue 15 Installation and Operation
Chapter 1: System Description
Overview
The SpectraComm Dual V.34 Modem is a full universal (on-line compatible with
all modems that comply with V.34), full-duplex, multi-speed modem, providing
33.6 kbps to 300 bps operation over the telephone (VF) line, and is connected to
a switched or private 2-wire line. The modem can support asynchronous or
synchronous DTE data rates up to 128 kbps. Operation can be either synchronous
or character asynchronous at all speeds down to 1200 bps. Operation is
asynchronous at 0 to 300 bps. Synchronous rates above 28.8 kbps require use of
the synchronous data compression feature.
Up to 16 Dual V.34 modem cards may be housed in a SpectraComm/UAS shelf,
and up to 31 may be housed in a dual shelf configuration, allowing for one SCM
card. The SpectraComm 2000 Shelf holds two cards and can be rack-mounted or
wall-mounted and supports central and remote site installation. For non-NEBS
standalone applications, the SpectraComm AC or DC enclosure can house one
product card.
Supported Protocols
• V.34 for negotiated high-data-rate connections
• V.42 (LAPM) error correction
•V.42bis data compression
• MNP-2 through MNP-4 error correction
• MNP-5 data compression
• MNP-10 cellular phones
•ITU-TV.32bis, V.32, V.22 bis, V.22, V.21 and V.34 modes
• Bell 212A and Bell 103 specifications
Security Features
• Password security (Online Security, SteadFast Security)
• Security Callback (prevents unauthorized access to a remote modem)
• Front Panel lockout
• When the modem is optioned at the factory, supports Remote Authentication
Dial In User Service (RADIUS).
• When the modem is optioned at the factory, supports AES Encryption.
• When the modem is optioned at the factory, supports Secure Access
Authentication.

System Description
1-2 SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15
Management Features
The Dual V.34 modem supports Simple Network Management Protocol (SNMP) Management
Information Base (MIB) files for modem control by an SNMP network controller. You must have
a SpectraComm Manager (SCM) card to access the MIBs.
The modem can also be managed locally via the DTE interfaceusing the AT command set, the ITU-
T V.25 bis command set, or remotely through an off-site V.34 modem and DTE. The modem
includes front panel controls for testing.
Other Features and Benefits
• Integral synchronous/asynchronous operation:
Synchronous DTE rates to 33.6 kbps, Asynchronous DTE rates to 128 kbps.
• 2-wire, full-duplex, switched network operation using permissive transmit level.
• 2- wire private line operation, with selectable transit level.
• Automatic VF line rate determination in V.34 and V.32 bis modes, with fallforward/fallback.
• V.42/MNP error control.
•V.42bis/MNP-5 asynchronous data compression.
• Supports MNP-10 for cellular phones.
• Synchronous data compression (supports rates up to 128 kbps).
• EIA/TIA-602 AT Command Set support.
•V.25bis compatible command protocol support.
• Remote Configuration to change a user’s configuration profile of a remote modem.
• Front panel with push-button testing and 17 status LEDs.
• Flash memory for downloading modem firmware.
• Permanent storage of modem configuration profiles in non-volatile memory.
• External, Internal, or Receiver Recovered transmit timing.
• Maximum line rate selection.
• Asynchronous character lengths of 8, 9, 10, and 11 bits.
• Intelligent Serial Terminal Dialer via the DTE interface, using the AT command set.
• Stores up to ten telephone numbers for easy dialing.
• Pulse or tone dialing.
• Automatic answer.
• Diagnostics include: Analog Loopback with or without Self-Test, Digital Loopback, Remote
Digital Loopback, End-to-End Self-Test (511 or in FSK ALT pattern).
• Supports FAX Class 1 operation.

System Description
060R122-000 SpectraComm Dual V.34 Modem 1-3
Issue 15 Installation and Operation
Diagnostic Testing
To help you restore service quickly in the event of problems, the Dual V. 34 provides diagnostics
for accurate detection of system faults, such as: Local Test, Local Loop Test Self-Test, Digital
Loopback, Remote Digital Loopback, Remote Digital Loopback Self-Test, and End-to-End Self-
Test. All of these tests can be used from a terminal or computer using AT commands, or from an
SNMP controller.
Local and Self-Tests can also be initiated from switches on the modem’s front panel. A front panel
Test Mode (TM) LED lights during all test modes, and indicates errors during Self Tests by flashing
to display detected errors.
Dual V.34 Modem Software
There are two types of computer software for use with a modem:
• terminal emulation software
• data communications software
Terminal emulation software essentially "downgrades" your computer to a dumb terminal. It allows
you to type at the keyboard and see responses on the video display or printer. Emulation programs
are often used to communicate with main-frame or mini-computers, and usually do not support disk
management or file transfers.
A full-featured data communications software package does allow file transfers, as well as
providing a dial directory, a script language for automated sessions, and a host of other features. Of
course, the more powerful and flexible a software package is, the more difficult it may be to master.
To take full advantage of the features of the SpectraComm Dual V.34 modem, your selected
program should allow turning off the autobaud feature. You should also be able to toggle both
XON/XOFF and hardware flow control. In addition, itshould supportseveral file transfer protocols
designed to be used with an error-correcting modem.
Modem Driver Software
The SpectraComm Dual V.34 modem is designed to interface seamlessly with Windows 95,
Windows 98, Windows 2000, and NT 4.0 via a dedicated modem device driver. You will need to
access the GDC internet site at www.gdc.com to download and install the GDC V.34 Modem
driver GDCV34.inf. The site also provides complete instructions for this procedure.
From the GDC home page click on Download software: V.34 modems. Then click on
Read inf.txt for instructions on how to update your software modem drivers.

System Description
1-4 SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15
Shelf / Enclosure Options
Figure 1-1 shows shelf and enclosure configurations for any model of the Dual V.34 modem. Up
to 31 modems can be accommodated in a shelf/enclosure configuration, alone or with other types
of network elements. Refer to Table 1-2 for shelf / enclosure descriptions and part numbers. For
more information on any shelf / enclosure system, refer to its manual as listed on the inside cover
of this manual.
Figure 1-1 Shelf / Enclosure Configurations
GPS-11E
POWER
SUPPLY
POWER
ON
FAIL
POWER
ON ( | )
OFF (0)
GPS-11E
POWER
SUPPLY
POWER
ON
FAIL
POWER
ON ( | )
OFF (0)
DUAL V.34 MODEM
DUAL V.34 MODEM DUAL V.34 MODEM DUAL V.34 MODEM DUAL V.34 MODEM
DUAL V.34 MODEM
SC/UAS
SHELF
V.F 28.8/33.6 Modem
SPECTRACOMM 2000
V.F 28.8/33.6 Modem
DUAL V.34 MODEMDUAL V.34 MODEM
NETWORK ELEMENTS
SLOTS 1-2
DUAL V.34 MODEM
General
DataComm
SC STANDALONE
ENCLOSURE
SC 2000
SHELF
NETWORK ELEMENTS
SINGLE SHELF: SLOTS 1-16
DUAL SHELF: SLOTS 17 - 32
COMPATIBLE
DEVICES
STAND ALONE
NETWORK ELEMENT

System Description
060R122-000 SpectraComm Dual V.34 Modem 1-5
Issue 15 Installation and Operation
Security Solutions
GDC modems provide several built-in and optional security features, described briefly below,
which can function alone or in various combinations (Table 3-3). Optional security features are
installed at the factory at the time of purchase, or can be factory upgraded in the field. GDC
continually enhances the security features of its V.34 modems. For the latest information, please
check www.gdc.com or contact your GDC representative.
Built-in Password Security Features
With Online Security enabled in the answering GDC modem, access is protected by passwords
stored in the modem. This feature can be configured for Pass-thru or Callback operation. With Pass-
thru, the modems handshake, then the caller is prompted to enter a valid password. With Callback,
a callback phone number previously saved in the answering modem is used to connect with an
authorized caller. Up to 10 phone numbers can be stored in the modem.
With SteadFast Handshake Security enabled in GDC modems at the originating and answering
sites, the answering GDC modem verifies the originating modem’s SteadFast password. Passwords
must be previously stored in both modems.
RADIUS Security Option
RADIUS (Remote Authentication Dial-In User Service) is an optional software feature for the
modem and SCM thatallows the modem to provide secure dial-in serial connections to the network.
In a RADIUS protected system, dial-in users will be authenticated through user names, passwords,
and challenged prompts coming from the modem and through the SCM to a RADIUS
authentication server.
• RADIUS Security also requires the SCM card and at least one RADIUS server.
• For additional modem-related information, refer to the Chapter 3 section in this manual on
RADIUS Security (Remote Authentication Dial-In User Service) .
For detailed SCM and RADIUS information, refer to the SpectraComm Manager Installation
& Operation Manual (048R303-000), Appendix B: SCM with RADIUS.
AES Encryption Option
AES Encryption employs the Advanced Encryption Standard which is a symmetric 128-bit block
data encryption technique that allows each modem to take transmit/receive asynchronous data and
encrypt/decrypt it on a dial-up or private line network. The user configures the modem for AES
Encryption by entering an encryption key and by typing expanded AT commands at one of the
modem’s management interface (Telnet via the SCM, the SCM craft port, or a terminal connected
to the modem’s DTE connector).
• A modem featured with AES Encryption is required at either end of the communication link
and with the same encryption key entered in both modems.
• A modem featured with AES Encryption does not support the following modem functions:
FAX, MNP10 (cellular link), sync compression, country codes other than USA and Canada,
TEAM configuration of SAM and encryption parameters.
Note For detailed configuration information, refer to Chapter 3 under the paragraphs on Security,
and the corresponding AT-command descriptions in Chapter 4.

System Description
1-6 SpectraComm Dual V.34 Modem 060R122-000
Installation and Operation Issue 15
SAM Authentication Option
When factory-optioned, the SC Dual V.34 modem can function as a Secure Access Modem (SAM)
in a Secure Access Controller (SAC) system. In this system, a SAC Administration Server, SAC
Access database, an Authentication server, Client desktop software, and the Secure Access modem
can authenticate remote users attempting to access protected network equipment, such as switches,
routers, multiplexers, etc. The Authentication Server generates the private key exchanged by the
modem and server, and the public key exchanged by the modem and remote user’s client software.
Each connection sets up a secure tunnel that passes AES-encrypted data to the authorized user.
When a user terminates a management session, the Secure Access Modem requests a connection to
the Authentication Server to obtain a new private key, thus preventing further access from the
previous remote user or intruders.
• The Secure Access Controller (SAC) system requires client software and dedicated servers. For
setup and configuration information, refer to the documentation that accompanies those
components.
• A SAM modem does not support the following functions: FAX, MNP10 (cellular link), sync or
async compression, private line operation, TEAM configuration of SAM and encryption
parameters.
• A SAM modem will support the following parameters only: country code for USA or Canada
(001), %Sncommands %S16 or %S17, Analoop with %S0, RTS-CTS Flow Control (\Q3).