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This table shows where to find specific information:
How to Use This Guide
connect the modems are installed and operational.
Conventions
The icon conventions that are used throughout this guide are:
The text conventions used in this guide are:
Additional Safety Information
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Introduction
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Principal Features
Implementation of
V.32 ter bo
negotiated between modems, providing a 16.7% increase in speed
over that which can be negotiated using V.32bis. If the modem you are
improvement in data transmission times over those achieved using V.32bis.
virtually unaffected by the increase in line rate, thereby producing a real
correction and data compression facilities. Compression factors remain
Typical Applications
Pack Contents Checklist
Registering Ownership of your Triple Modem Module
Pre-installation Requirements
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Installing The Module
Installing the Rear Card
Installing the Front Card
1
plane and pull the front card free from the chassis using the handles.
To remove the card, unlatch the handles to free the card from the back
Close and lock the chassis door.
Connecting the Cables
Front Panel LEDs
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Modem - DTE Connection
Modem - Telephone Line Connection
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On-line Operation
Private-line Operation
Dial Backup Operation
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Autodial - Autoanswer
Progress tones and answer tone detection.
dial tone detection. Secondary dial tone detection for PABX use.
600 ohm impedance. Bell tinkle suppression provided. Old and new
Line Interface
Physical Description
Approvals Information
This product complies with the electro-magnetic compatibility (EMC)
presented to one another by the apparatus and the digital circuit.
such as to introduce no material effect upon the electrical conditions
The overall transmission characteristics of all that other apparatus shall be
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CAUTION:
Danger of explosion if the battery is incorrectly replaced.
proceed indication.
This unit is suitable for connection to PBXs which return secondary
difficulty should be referred to the supplier of the unit.
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DTE Port Pin Assignments
odem is equipped with a single serial port marked DTE, which
suitable cable.
characteristics should be observed when purchasing or fabricating a
connecting cable is not supplied with the module. The following signalling
V.24/V.28
V.35/V.36
The DTE port terminates with a 26-way miniature SCSI connector.
purchasing or fabricating a suitable cable.
following signalling characteristics should be observed when
The DTE port connecting cable is not supplied with the module. The
P
STN Port Cable Pin Assignments
P
rivate Line Port Cable Pin Assignments
:
be connected to a 2- or 4-wire private line outlet using a cable
communications card). This is an RJ11 type socket, that would typically
B
Call the telephone number nearest you:
World Wide Web Site
articles from 3TECH (3Coms award-winning technical journal) and
customer service and support, 3Coms latest news releases, selected
This service features news and information about 3Com products,
Access the latest networking information on 3Coms World Wide Web
Support from Your Network Supplier
Support from 3Com
If you are unable to receive support from your network supplier,
office to find your authorized service provider:
If you are outside the U.S. and Canada, contact your local 3Com sales
for customer service.
Returning Products for Repair
A product sent directly to 3Com for repair must first be assigned a
To obtain an RMA number, call or fax:
the senders expense.
without an RMA number will be returned to the sender unopened, at
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