DS1-BD (DS1 Interface Circuit Pack)
Issue 4 May 2002
10-667555-233-123
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 ELB Test.
When the ELB Test is initiated, maintenance software sends an appropriate
message to the TN767E DS1 Interface circuit pack to start the test. The board
sets up the ELB 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.
Table 10-245. TEST #1210 CSU Equipment Loopback Test
Error
Code
Tes t
Result Description/Recommendation
ABORT Internal system error
1. Retry test ds1-loop UUCSS ds1/csu-loopback-tests at
1-minute intervals a maximum of 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 DS1 circuit pack administration form must be set to integrated
and the “Bit Rate” field must be set to “1.544” (24-channel
operation).
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 the 24-channel configuration.
2. Retry test ds1-loop UUCSS ds1/csu-loopback-tests.
1015 ABORT Ports on the DS1 Interface circuit pack have not been busied out
to out-of-service.
1. Enter the busyout board UUCSS command to put all trunks
or ports of the DS1 Interface circuit pack into the
out-of-service state.
2. Retry the command.
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