Zhone Technologies IMACS-200 - Manual (Page 201)

High Speed Data Ports 9-13
9.4 HSU Error Messages
Refer to Appendix B for further information on HSU Error Messages.
9.5 HSU Port Troubleshooting
Problems with an HSU ports 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 port, follow this general sequence:
1. First, verify that the T1 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 HSU port, and also with the data ports of all other data cards
connected to the same T1 line. If no CGA alarms are present, continue with step 2.
2. If the trouble is only with the current HSU 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 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 port to test the affected port. These tests are
accessible from the HSU 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
port at either end.
6. Should the HSU port be determined as faulty, return the IMACS-200 for repair to the
location specified by your distributor.