Avaya S8700 Maintenance Manual page 1359

For multi-connect configurations

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DS1-BD (DS1 Interface Circuit Pack)

CSU Repeater Loop-Back Test (#1211)

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.

This test will only be performed if the 120A CSU module/T1 sync splitter is

present, administered, and connected to a 1.544-Mbps TN767E DS1 circuit pack

behind the port carrier.

The test is destructive and can only be initiated by a technician demanded

test ds1-loop UUCSS ds1/csu-loopback-tests command.

All trunks or ports on the DS1 Interface circuit pack must be busied out via the

system technician busyout board command before running the RLB test.

When the RLB test is initiated, maintenance software sends an appropriate

message to the TN767E DS1 Interface circuit pack to start the test. The board will

set up the RLB loop back, transmit a test pattern, and verify that the pattern is

received unaltered through the loop back. If the transmitted and received pattern

is different, the test fails.

In addition, 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, all trunks or ports on the TN767E DS1 Interface circuit

pack are restored to the in-service state after the release board command is

Issue 1 May 2002

Troubleshooting