Maintenance Object Repair Procedures
555-233-123
10-1966 Issue 4 May 2002
System Technician-Demanded Tests:
Descriptions and Error Codes
Investigate errors in the order they appear in the table below.
TDM Test (#1285)
This test is destructive.
This test verifies whether the VAL port can send and receive data on the TDM
bus. This test has a tone generator send tones on a timeslot, and it has a tone
receiver receive tones on another timeslot. The tones are looped through the
record/playback port.
Test failure indicates failure of one or more of the following components:
■ VAL (TN2501) circuit pack
■ TDM Bus
■ Tone generator / tone receiver circuit pack
Table 10-704. System Technician-Demanded Tests: VAL-PT
Order of Investigation
Short Test
Sequence
Long Test
Sequence D/ND
1
1 D = Destructive, ND = Non-destructive
TDM Looparound Test (#1285) X D
SCOTCH Synchronous Looparound Test (#1275) X D
If the received tones: Then:
Match the tones sent The test passes.
Do not match the tones sent The test fails.
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