Zhone Technologies 900 - Manual (Page 106)

3-18 IMACS System Release 5.1.6 Data Cards
Model No. Running Head OCU-DP Card Error Messages OCU-DP Card
3.4 OCU-DP Card Error Messages
Refer to Appendix B in the System Reference Guide for further information on Error
Messages regarding this card.
3.5 OCU-DP Card Troubleshooting
OCU-DP card 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 DSU/CSU and OCU-DP card at the near end
• Faulty cabling between the DSU/CSU and OCU-DP at the far end
• T1 or E1 network failure
• Improper card 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. You can perform numerous tasks to isolate the trouble and clear it. When
troubleshooting transmission problems on a data circuit passing through an OCU-DP 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 may exist with the other ports of the same OCU-DP 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 3.
3. 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
card 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.
4. At the local end (where the incoming data loss was first observed), use the loopback
and test signal functions of the OCU-DP card to test the affected port. These tests are
accessible from the OCU-DP Card Main Screen (through the LB and related
parameters) and its associated Test Screen (through the BERT parameter), 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
OCU-DP card at either end.
6. If the OCUDP card is determined to be faulty, replace it and return the faulty unit for
repair to the location specified by your distributor.