Maintenance Object Repair Procedures
555-233-123
10-588 Issue 4 May 2002
System Technician-Demanded Tests: Descriptions
and Error Codes
Always investigate tests in the order they are presented in the table below when
inspecting errors in the system. By clearing error codes associated with the NPE
Crosstalk Test, for example, you may also clear errors generated from other tests
in the testing sequence.
NPE Crosstalk Test (#6)
One or more Network Processing Elements (NPEs) resides on each circuit pack
with a TDM Bus interface. (The TN464 UDS1 circuit pack has one SCOTCH-NPE
chip instead of several NPE chips.) 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
usually only part of a port’s Long Test Sequence and takes about 20 to 30
seconds to complete.
Order of Investigation
Short Test
Sequence
Long Test
Sequence D/ND
1
1 D = Destructive; ND = Nondestructive
NPE Crosstalk Test (#6) X ND
Conference Circuit Test (#7) X ND
DS1 Dial Tone Test (#314) X X ND
Port Audit and Update Test (#36) X X ND
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