Avaya DEFINITY Server CSI Maintenance Manual page 1826

Maintenance Objects
CSU Equipment Loopback Test (#1210)
This test is destructive.
The CSU Equipment Loopback (ELB) Test causes a loopback at the near-edge of
the local 120A1 CSU Module or the 401A T1 Sync Splitter and tests the
connection from the DS1 board to the CSU Module/T1 Sync Splitter (DS1 board
edge interconnecting cable, and CSU Module/T1 Sync Splitter edge). This test is
only performed if the 120A1 CSU Module or the 401A T1 Sync Splitter is present,
administered, and connected to a 1.544 Mbps 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 UDS1 Interface circuit pack must be busied out using the
system technician busyout board command before running the ELB Test.
When the ELB Test is initiated, maintenance software sends an appropriate
message to the UDS1 Interface circuit pack to start the test. The board sets up the
ELB loopback, transmits a test pattern, and verifies that the pattern is received
unaltered through the loopback. If the transmitted and received pattern is
different, the test fails.
When the test is complete, all trunks or ports on the UDS1 Interface circuit pack
are restored to the in-service state after the release board command is entered.
Table 540. TEST #1210 CSU Equipment Loopback Test
Error Test
Code Result
ABORT Internal system error
1005 ABORT CSU Equipment Loopback Test cannot be executed in the current
configuration. To run this test, the Near-End CSU Type field on the DS1circuit
pack administration form must be set to integrated and the "Bit Rate" field on
the DS1 circuit pack administration form must be set to "1.544" (24-channel
configuration).
1826
Issue 5 October 2002
Description/ Recommendation
1. Retry the test ds1-loop UUCSS ds1/csu-loopback-tests command at
1-minute intervals a maximum of 5 times.
1. Use the change ds1 UUCSS command to set the Near-End CSU Type
field on the DS1 circuit pack administration form to integrated, and/or
change the "Bit Rate" field to "1.544" if the board is to be used in
24-channel configuration.
2. Retry the test ds1-loop UUCSS ds1/csu-loopback-tests command.
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