Zhone Technologies 900 - Manual (Page 85)

Data Cards IMACS System Release 5.1.6 2-19
SRU Card SRU Card Error Messages
2.6 SRU Card Error Messages
Refer to Appendix B in the System Reference Guide for further information on Error
Messages regarding this card.
2.7 SRU Card Troubleshooting
SRU 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 DTE and SRU card at the near end
• Faulty cabling between the DTE and SRU card 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 SRU card, follow
this general sequence:
1. If all ports are affected, verify that the US/EUR jumper is correctly placed to match the
US/EUR jumper on the chassis.
2. 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 SRU 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 SRU card to test the affected port. These tests are
accessible from the SRU Card 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.