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Maintenance Object Repair Procedures
555-233-123 10-1672 Issue 4 May 2002
BRI Port Local LAN Looparound Test (#618)
This test is destructive.
This test checks the connectivity of the BRI port across the LAN bus. Because this
test is destructive, run this test only if the port is out-of-service.
Failures of this test indicate either on-board faults associated with the TBRI-PT
hardware on the circuit pack or problems with the LAN Bus, which is used to form
connectivity between the switch and the TBRI-PT.
If the port is in a state other than out-of-service, the BRI Port Local LAN
Looparound Test will abort. If the port is out-of-service, then the port is put into a
local looparound mode and the following test is executed.
A looparound test is performed across the Packet Bus for the D-Channel. The
switch sends data over a packet connection, which is looped back by the BRI port
(D-Channel) and received back by the switch. The test passes if the packet
connection can be established and the transmitted data is received unaltered. The
test aborts if the Packet Bus is alarmed in the Processor Port Network (or the port
network in which that circuit pack resides) or if the Packet Interface board is
out-of-service. The test fails due to either on-board faults associated with the BRI
port hardware on the circuit pack or problems with the LAN bus.
1, 2 FAIL The NPE of the tested port was found to be transmitting in
error, causing noisy and unreliable connections. Error code 1
indicates that the NPE Crosstalk Test failed on Channel B1.
Error code 2 indicates that the NPE Crosstalk Test failed on
Channel B2.
1. Replace circuit pack.
PASS The port is correctly using its allocated time slots.
1. To be sure that this is not an intermittent problem, repeat
this test a maximum of 10 times to ensure it continues to
pass.
2. If complaints still exist, examine the connections and
wiring.
Table 10-613. TEST #617 NPE Crosstalk Test — Continued
Error
Code Test
Result Description/Recommendation
Continued on next page