UDS1-BD (UDS1 Interface Circuit Pack)
Issue 1 May 2002
8-1281555-233-142
CSU Equipment Loop-Back 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 and tests the connection from the DS1 board to the
CSU module (DS1 board edge interconnecting cable, and CSU module edge).
This test is only performed if the 120A1 CSU module is present, administered,
and connected to a 1.544-Mbps DS1 circuit pack behind 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.
Every trunk or port 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, every trunk or port on the UDS1 Interface circuit pack
is restored to the in-service state after the release board command is entered.
Table 8-536. Test #1210 CSU Equipment Loop-Back Test
Error
Code
Tes t
Result Description / Recommendation
ABORT Internal system error
1. Retry the test ds1-loop UUCSS ds1/csu-loopback-tests command at
1-minute intervals up to 5 times.
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).
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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