Maintenance Object Repair Procedures
555-233-123
10-1920 Issue 4 May 2002
The Far CSU Loopback Test has the UDS1 Interface circuit pack transmit a
loopback activation code to the remote CSU, waits up to 15 seconds for return of
the code to verify the loopback has been established, transmits a framed 3-in-24
test pattern, begins counting bit errors in the received test pattern, and returns a
PASS result. If the loopback is not established within the 15 seconds, the test
fails.
The status of the Far CSU Loopback test is available in the hardware error log via
Error Type 3901. Several distinct Aux values give the user information of the
status of the test.
The list measurements ds1 summary command will display the length of time
the test has been running (Test Duration field) and number of bit errors
detected (Loopback/Span Test Bit-Error Count field). If the test pattern is
being passed through the loopback cleanly, the number of bit errors should be
very low. The command will also display the type of Loopback/Span test executing
(Test field), the type of pattern generated for the type of Loopback/Span test
(Pattern field), and whether the pattern (i.e. 3-in-24 Pattern) is synchronized
(Synchronized field).
To terminate the test, enter test ds1-loop UUCSS end-loopback/span-test or
release board. Using the release board command will restore all trunks or ports
on the UDS1 Interface circuit pack to the in-service state.
Table 10-686. TEST #1213 Far CSU Loopback Test
Error
Code
Te s t
Result Description/Recommendation
ABORT Internal system error
1. Retry the test ds1-loop UUCSS
far-csu-loopback-test-begin command at 1-minute
intervals a maximum of 5 times.
1005 ABORT Far CSU Loopback Test cannot be executed in the current
configuration. To run this, the TN464F or later suffix UDS1 must
be administered for 24-channel operation. The “Bit Rate” field on
the DS1 circuit pack administration form must be set to “1.544”
for 24-channel operation.
1015 ABORT Ports on the UDS1 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 UDS1 Interface circuit pack into the
out-of-service state.
2. Retry the command.
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