3TROUBLESHOOTING Troubleshooting Guide 3-1

Modem Health 3-1

Modem - DTE Connection 3-2

Modem - Telephone Line Connection 3-3

Connection Problems in Answering a Call 3-3

Connection Problems When Originating a Call 3-4

On-line Operation 3-6

 

Private-line Operation

3-6

Dial Backup Operation

3-6

AMODEM SPECIFICATION AND INTERFACE PIN ASSIGNMENTS

Transmitter / Receiver Specifications

A-1

Autodial - Autoanswer A-2

 

 

Physical Description

A-3

 

 

 

Approvals Information

A-4

 

 

General Approvals Requirements

A-4

Interference and Safety Requirements A-5

PBX and PABX Application

A-6

 

Ringer Equivalence

A-7

 

 

DTE Port Pin Assignments

A-8

 

 

X.21/V.11

A-8

 

 

 

 

V.24/V.28

A-9

 

 

 

 

V.35/V.36

A-10

 

 

 

 

PSTN Port Cable Pin Assignments

A-11

Private Line Port Cable Pin Assignments A-12

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3Com 980/000048/001 manual Modem Specification and Interface PIN Assignments