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DS1-BD (DS1 Interface Circuit Pack)
Issue 5 October 2002
1123
555-233-119
CSU Repeater Loopback Test (#1211)
This test is destructive.
The CSU Repeater Loopback (RLB) Test causes a loopback 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
on the back of the port carrier.
The test is destructive and can only be initiated by a system 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 loopback, transmit a test pattern, and verify that the pattern is
received unaltered through the loopback. 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 which may not be detected by the
loopback 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
entered.