Maintenance Object Repair Procedures
555-233-123
10-572 Issue 4 May 2002
Digital Line NPE Crosstalk Test (#9)
One or more Network Processing Elements (NPEs) reside on each circuit pack
with a TDM Bus interface. The NPE controls port connectivity and gain, and
provides conferencing functions on a per-port basis. The NPE Crosstalk Test
verifies that this port’s NPE channel talks on the selected time slot and never
crosses over to time slots reserved for other connections. If the NPE is not
working correctly, one-way and noisy connections may be observed. This test is
part of a port’s Long Test Sequence and takes about 20 to 30 seconds to
complete. Crosstalk testing is performed on both the primary information channel
(voice) and the secondary information channel (data) associated with each digital
station port. If this test fails on either channel, the station and the DTDM are taken
out-of-service.
16 FAIL The secondary channel (data Information Channel 2 or I2 is
not operating properly. User impact may range from noticing
nothing to not being able to use this terminal. Check the
results of Voice and Control Channel Local Loop Test (#13). If
that test fails, suspect the Digital Line circuit pack. If that test
passes then replace the terminal. If both test fail, and
component replacement does not change the results, then:
1. Run circuit pack tests to check the tone generator circuit
pack and the Tone Detector circuit pack using the test
board PCSSpp command.
2. Resolve any problems that are detected on the Tone
Generator circuit pack or Tone Detector circuit pack.
3. If the Tone Generator and Tone Detector circuit pack are
functioning properly, and the tests still fail, escalate the
problem.
PASS Voice and Control Channel Local Loop test passed. All
channels are transmitting properly.
1. To be sure that this is not an intermittent problem, repeat
this test up to a maximum of ten times to make sure it
continues to pass.
2. If complaints persist (noisy connections for voice.
corrupted data transfer for data), examine the station,
connections, and wiring.
Table 10-211. TEST #1201 Digital Terminal Remote Loop Around Test — Continued
Error
Code
Te s t
Result Description/Recommendation
Continued on next page
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