Avaya S8700 Maintenance Manual page 544

Maintenance Object Repair Procedure
Internal Loop-Around Test (#135)
This test is destructive.
The Internal Loop-Around test is run by looping the transmitted DS1 bit stream
back into the UDS1 board's receiver. The loop occurs just before the DS1 facility
interface. The test is highly destructive and can only be initiated by a
technician-demanded reset board UUCSS command.
Every trunk or port on the UDS1 Interface circuit pack must be busied out using
the technician's busyout board command before running the Internal
Loop-Around test. When the Internal Loop-Around test is initiated, maintenance
software sends appropriate messages to the UDS1 Interface circuit pack to start
the test. The test uses the Tone Generator and Tone Detector to exercise a
bit-pattern consistency test for every port. If the transmitted and received bit
patterns on a trunk or port are different, the test fails.
When the test completes, the maintenance software sends a stop loop around
message to the UDS1 Interface circuit pack to put the circuit pack back into the
normal operation mode. Every trunk or port of the UDS1 Interface circuit pack is
restored to the in-service state after the release board command is entered.
Table 8-525. Test #135 Internal Loop-Around Test
Error Test
Code Result Description / Recommendation
1002 ABORT The system could not allocate time slots for the test. The system may be under
heavy traffic conditions or it may have time slots out-of-service due to
TDM-BUS errors.
1. If system has no TDM-BUS errors and is not handling heavy traffic, repeat
1003 ABORT The system could not allocate a tone receiver for the test. The system may be
oversized for the number of Tone Detectors present or some Tone Detectors
may be out-of-service.
1. Resolve any TTR-LEV errors.
2. Resolve any TONE-PT errors.
3. If neither condition exists, retry the reset board command at 1-minute
1004 ABORT Received an incoming call on a port of the UDS1 circuit pack during the test.
1. Enter the busyout board UUCSS command to put every trunk or port of
2. Retry the reset board command at 1-minute intervals up to 5 times.
8-1240 Issue 1 May 2002
test at 1-minute intervals up to 5 times.
intervals up to 5 times.
the UDS1 Interface circuit pack to out-of-service state.
Continued on next page
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