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Maintenance Objects
1782
Issue 5 October 2002
Internal Looparound Test (#135)
This test is destructive.
The Internal Looparound Test is run by looping the transmitted DS1 bit stream
back into the UDS1’s board receiver. The loop occurs just before the DS1 facility
interface. The test is highly destructive and can only be initiated by a system
technician-demanded reset board UUCSS 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 Internal
Looparound Test. When the Internal Looparound 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 all ports. 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. All trunks or ports of the UDS1 Interface circuit pack are
restored to the in-service state after the release board command is entered.
Table 529. TEST #135 Internal Looparound Test
Error
Code Test
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 test at 1-minute intervals a maximum of 5 times.
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
intervals a maximum of 5 times.
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 all trunks or ports of
the UDS1 Interface circuit pack to out-of-service state.
2. Retry the reset board command at 1-minute intervals a maximum of 5
times.
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