Zhone Technologies IMACS-200 manual SRU port Error Messages, SRU port Troubleshooting

SRU port Error Messages SRU Ports

8.4SRU port Error Messages

Refer to Appendix B in the System Reference Guide for further information on Error Messages regarding this port.

8.5SRU port Troubleshooting

SRU port problems could indicate a number of possible causes, including:

•Faulty receiving DTE at the near end (where the problem was first noticed)

•Faulty transmitting DTE at the far (opposite) end

•Faulty cabling between the DTE and SRU port at the near end

•Faulty cabling between the DTE and SRU port at the far end

•T1 network failure

•Improper port configuration at either end (e.g., time slot and/or WAN port assignments)

Typically, a problem is indicated by a loss of incoming signal on a data port at either end of the circuit. When troubleshooting transmission problems on a data circuit passing through an SRU port, follow this general sequence:

1.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 may exist with the other ports of the same SRU port, and also with the data ports of all other data ports connected to the same T1 line. If no CGA alarms are present, continue with step 2.

2.Verify that the DS0 time slot and sub-rate TS assignments of the faulty port at both ends of the data circuit path are correct. Also be sure the port is connected to the proper WAN port and port and that other critical parameters, such as RATE, are set the same at each end. If these assignments are correct, continue with step 4.

3.At the local end (where the incoming data loss was first observed), use the loopback and test signal functions of the SRU port to test the affected port. These tests are accessible from the SRU port Main Screen (through the LB and related parameters) and its associated Test Screen (through the BERT parameter), as previously described in this chapter. These allow you to test the circuit path in segments and thereby quickly pinpoint the problem.

4.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 SRU port at either end.

5.If the SRU port is determined to be faulty, the IMACS-200 will need to be replaced or returned for repair to the location specified by your distributor.

8-12 Sub Rate Data Ports