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A. Troubleshooting
A-33830-A2-GB91-30 August 1998
Table A-2
Modem – DTE Connection
Symptom
Action
Modem does not accept
or echo back AT
commands
Verify that the cable between the Async port of
the DTE and the modem is a standard
EIA-232 cable. If the cable is bad, replace it.
(Null modem cables, also known as crossover
cables, do not work in this application.)
Reload the Async Dial factory configuration
area to guarantee that all configuration options
are returned to their proper setting. Refer to
the
Recovering AT Commands
section in
Chapter 2.
Make sure that all AT commands are
terminated with a carriage return.
Verify that the DTE has a valid character
format. Valid format consists of 8 data bits with
no parity or 7 data bits with even, odd, mark or
space parity.
Verify that the DTE’s data rate is set to a level
supported by the modem (115,200 bps–
300 bps).
If using a PC, verify that the modem is
attached to the correct communications port.