Avaya 03-300430 User Manual

This test is destructive.
The CSU RLB (Repeater Loopback) test causes a loop back at the far-edge of the local 120A 
CSU module or T1 sync splitter, and tests the connection from the TN767E DS1 board to and 
including the CSU module/T1 sync splitter circuitry. The test runs only if the 120A CSU module/
T1 sync splitter is present, administered, and connected to a 1.544-Mbps TN767E DS1 circuit 
pack on the back of the port carrier.
The test is destructive and can only be initiated by test ds1-loop location ds1/
csu-loopback-test.
Use busyout board to busy out all trunks or ports on the DS1 Interface circuit pack before 

running the RLB test.
When the RLB test is initiated, maintenance software sends a message to the TN767E DS1 
Interface circuit pack to start the test. The board sets up the RLB loop back, transmits a test 
pattern, and verifies that the pattern is received unaltered through the loop back. If the 
transmitted and received pattern is different, the test fails.
The DS1 circuit pack hardware applies a DC current while the test is running in order to detect 
any broken wires that may not be detected by the loop-back pattern.
When the test is complete, use release board to restore all trunks or ports on the TN767E 

DS1 Interface circuit pack to the in-service state.

ABRT

Internal system error

1. Retry test ds1-loop location ds1/csu-loopback-tests at 

1-minute intervals up to 5 times.

1005

ABRT

CSU Repeater Loopback test cannot be executed in the current 
configuration.

1. Use change ds1 location and set the Near-End CSU Type field 

on the DS1 circuit pack administration screen to integrated, and/or set 
the Bit Rate field to 1.544 if the board is to be used in a 24-channel 

configuration.

2. Retry test ds1-loop location ds1/csu-loopback-tests.

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