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