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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 DS1’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 on the DS1 Interface circuit pack must be busied out via the system
technician busy-out board command before running the Internal Looparound
Test. When the Internal Looparound Test is initiated, maintenance software sends
appropriate messages to the DS1 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 are
different, the test fails.
When the test is complete, the maintenance software sends a stop loop around
message to the DS1 Interface circuit pack to put the circuit pack back into the
normal operation mode. All trunks of the DS1 Interface circuit pack are restored to
the in-service state after the release board command is entered
Table 226. TEST #135 Internal Looparound Test
Error
Code Test
Result Description/ Recommendation
2012 ABORT Internal system error
1. Retry the command at 1-minute intervals a maximum of 5 times.
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 test at 1-minute intervals a maximum
of 5 times.
1004 ABORT Received an incoming call on a port of the DS1 circuit pack during the test.
1. Enter the busy-out board UUCSS command to put all trunks of DS1
Interface circuit pack to out-of-service state.
2. Retry the command at 1-minute intervals a maximum of 5 times.
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