Zhone Technologies 900 - Manual (Page 157)

Data Cards IMACS System Release 5.1.6 5-43
BRI Card BRI Card Error Messages
5.4 BRI Card Error Messages
Refer to Appendix B in the System Reference Guide for further information on Errors
Messages regarding this card.
5.5 BRI Card Troubleshooting
BRI card problems could indicate a number of possible causes, including:
• Faulty receiving CPE at the near end (where the problem was first noticed)
• Faulty transmitting CPE at the far (opposite) end
• Faulty cabling between the CPE and BRI card at the near end
• Faulty cabling between the CPE and BRI 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 BRI port at either end
of the circuit. On a BRI card, this may be either a voice or data circuit. You can perform
numerous tasks to isolate the trouble and clear it. When troubleshooting transmission
problems on a BRI circuit passing through an BRI card, follow this general sequence:
1. If all ports are affected, verify that the US/EUR jumper on the BRI card is correctly
placed to match the US/EUR jumper on the chassis. Also, verify that LT and NT
jumpers are correctly placed on the ports under test.
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 BRI 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 BRI B-channel time slot and D-channel (if used) time slot assignments
of the faulty port at both ends of the BRI 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 TERMINAL, TYPE and B MODE, are set correctly at each end. If these
assignments are correct, continue with step 4.
4. Selecting the Test screen from the main menu, check the status of the L1-ST parameter.
It should indicate actv. Any other status (such as fail) is an abnormal state and indicates
problems that must be corrected before proceeding.
5. For “U” interface cards, go to the Performance Registers screen for the BRI port (which
can be accessed by selecting Perf from the BRI Main Screen while the cursor is on the
selected port). Analyze the performance register information, as well as the Status
column. If all appears normal, continue with step 6.