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DEFINITY Communications System CHAPTER 5: TROUBLESHOOTING
7400B Data Module
User’s Guide
Page 5-7
Symptom Problem
Solution
Commands are displayed
The local terminal device Set the terminal device for one of
without error as they are
is set to a speed not
the supported speeds: 300, 1200,
typed (echoed), but the
supported by the 7400B
2400, 4800, 9600, or 19200 bps.
data module does not
Data Module.
respond to any command.
The CONNECT message The data module is Configure the data module to send
is sent without a speed
configured to display only CONNECT nnnn messages for all
indication, but the far end
the basic set of result
speeds except 300 bps by typing
device is not set at 300
codes (option
x0).
bps.
atx4
[ Enter ]
The terminal device has
A defective or non-
Replace the EIA-232-D cable with
its DTR lead turned on,
standard (null-modem)
one that is wired correctly.
but the TR LED is off. EIA-232-D cable is in use.