Zhone IMACS 8000, User Manual

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14-50 Data Cards
Model No.
Running Head
HSU Card Error Messages HSU Card
14.4 HSU Card Error Messages
Refer to Appendix B in the System Reference Guide for further information on HSU Card
Error Messages.
14.5 HSU Card Troubleshooting
Problems with an HSU Card could be caused by a number of things. Typically, a problem is
indicated by a loss of incoming signal on a data port at either end of the circuit. You can
perform numerous tasks to isolate the trouble and clear it. When troubleshooting transmission
problems on a data circuit passing through an HSU Card, follow this general sequence:
1. First, verify that the T1 or E1 network is working properly by checking for current
CGA-Red and CGA-Yellow alarms. If the network is faulty, the same transmission
problem will exist with the other port of the same HSU Card, and also with the data
ports of all other data cards connected to the same T1 or E1 line. If no CGA alarms are
present, continue with step 2.
2. If the trouble exists on both ports of the same card, but not on any other cards, replace
the local HSU Card. If the trouble is only with the current HSU Card and port, continue
with step 3.
3. Check the DS0 time slot assignments of the faulty port at both ends of the data circuit
path. Also be sure the port is connected to the proper WAN card and port at each end.
If these assignments are correct, continue with step 4.
4. At the local end (where the incoming data loss was first observed), use the loopback
and test signal functions of the HSU Card to test the affected port. These tests are
accessible from the HSU Card Main Screen and associated Test Screen, as previously
described in this chapter. They allow you to test the circuit path in segments and thereby
quickly pinpoint the problem.
5. If necessary, also perform loopbacks and send test signals to the affected circuit from
the other end. In addition, you can perform end-to-end tests using a suitable data test
set at one or both ends of the circuit in conjunction with the loopback functions of the
HSU Card at either end.
6. If the HSU Card is determined to be faulty, replace it and return the faulty unit for repair
to the location specified by your distributor.