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BRI-PORT (ISDN-BRI Port)
Issue 1 June 2005 691
System Technician-Demanded Tests:
Descriptions and Error Codes
Investigate tests in the order presented. By clearing error codes associated with the NPE
Crosstalk test (#617), you may clear errors generated from other tests in the sequence.
Note:
Note: The NPE Crosstalk test and the BRI Port Local TDM Loop Around test are not
executed for ABRI-PORT/ATT-PORT/LGATE-PT/ATTE-PT.
NPE Crosstalk Test (#617)
This test is destructive.
One or more NPEs reside on each circuit pack with a TDM-bus interface. The NPE controls
port connectivity and gain, and provides conferencing functions on a per-port basis. The NPE
Crosstalk test verifies that this port’s NPE channel talks on the selected time slot and never
crosses over to time slots reserved for other connections. If the NPE is not working correctly,
one-way and noisy connections may be observed. This test is part of a port’s long test
sequence and executes in approximately 20 to 30 seconds. Crosstalk testing is performed on
both B channels (B1 and B2) associated with a BRI port. If this test fails on either channel, any
endpoint connected to the port is taken out-of-service.
Order of Investigation Short Test
Sequence
Long Test
Sequence
D/ND
1
1. D = Destructive; ND = Nondestructive
NPE Crosstalk test (#617) X D
BRI Port Local LAN Loop Around test (#618) X D
BRI Port Local TDM Loop Around test (#619) X D
Electronic Power Feed Restoral test (#620) X X ND
Level 1 Status Inquiry test (#621) X X ND
Electronic Power Feed Inquiry test (#622) X X ND
CRC Error Counter test (#623) X ND
Layer 1 Transmission Error Counter test (#624) X ND
Receive FIFO Overflow Error Counter (#625) X ND
Clear Error Counters (#270) X X ND