DSP9612RM USER’S GUIDE
0049-0519-000
Page 27
REV.D
Appendix A
Troubleshooting
I
n the event you encounter a problem using your modem, refer to the
troubleshooting information in this appendix. To troubleshoot the power supply
and backplane on the modem rack, refer to the documentation that came with
your modem rack.
,
IMPORTANT
If you encounter a problem with your modem,
be sure the modem switches are set to the
appropriate positions. If a switch is halfway
between an on and off setting, the modem will
not operate properly.
Problem Solving
Table A-1 offers troubleshooting solutions for modem problems.
Table A-1. Troubleshooting Suggestions
If…
Perform These Procedures…
Modem does not
respond and all LEDs
are off.
Check the modem rack power supply
module(s).
Modem does not
receive data, and the
DCD
and
RxD
LEDs
are off.
The receive line pair may be
disconnected from the modem. Make
sure the transmission line connection to
the rear panel of the modem rack is
accurate and secure.
The receive signal level may be below
the CD threshold. Set SW1-5 ON to see
whether configuring the modem for a
−
43 dBm threshold resolves the
problem.
The
RTS
,
CTS
, and
TxD
LEDs do not
blink.
The attached terminal or DTE may not
be sending data to the modem. Verify
that data is being transmitted. If data is
being transmitted, make sure the RS-
232 cable is sound and securely
connected to the modem and terminal
or DTE.
