Chapter 5: Troubleshooting; How To Use This Chapter - AT&T 7400B Plus User Manual

DEFINITY Communications System
7400B Plus Data Module
User´s Guide

CHAPTER 5: TROUBLESHOOTING

HOW TO USE THIS
CHAPTER
This chapter describes procedures for troubleshooting most
problems that may be encountered while installing, configuring,
and operating the 7400B Plus.
Use the following guidelines to isolate and correct a problem:
Scan through the ''Symptom'' column in the chart to find the
1
description that best describes the problem situation you
have encountered.
In the ''Problem'' column, one or more problem descriptions
2
is offered. Select the one that best describes the observable
condition, or try each suggestion in turn until the trouble has
been corrected.
Perform the task described in the ''Solution'' column. In
3
cases where you are directed to type an AT command to
correct the problem and the 7400B Plus is in the data mode,
simply do the following:
Type the escape sequence (+++) to enter command
a
mode; the data module will respond with OK or 0
(unless the Q1 option has been set to disable result
codes).
Type the suggested command line (if the solution
b
suggests disconnecting the call), type the command
line
ath (
Enter.
To return to data mode after using the escape sequence to
4
enter command mode, type the command line
ato ( )
Enter.
CHAPTER 5: TROUBLESHOOTING
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