MD9612FP USER’S GUIDE
0049-1237-XXX
Page 23
REV.
A
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.
