Avaya S8700 Maintenance Manual page 984

Maintenance-Object Repair Procedures
Table 8-109. Test #647 Layer 2 Status Query Test — Continued
Error Test
Code Result Description / Recommendation
3 FAIL The D channel is down.
1. Examine the results of the Primary Signaling Link Hardware Check (#636)
2. If Test #636 (Primary Signaling Link Hardware Check) passes, the Layer 2
3. Verify that the far-end signaling channel (D channel) has been
4. Verify that the far-end ATM-DCH ports used for the Primary and Secondary
PASS The Primary signaling channel is up.
Remote Layer 3 Query (#1291)
This test queries the far-end switch or terminal adapter to determine whether the
signaling connection is functioning properly at Layer 3. It selects a B channel in
the in-service or maintenance service state and sends an ISDN layer-3 SERVice
message, which requires a response from the far end (similar to performing
Test #256 on an ISDN trunk). The test is not performed if there are no B channels
in an appropriate ISDN service state (for example, when none are administered or
they are all out of service).
NOTE:
The service state can be displayed by using the status trunk
trunk-group/trunk-member or status pri-endpoint command.
As is the case with Test #256 for an ISDN trunk, a PASS only indicates that a
message was composed and sent to the far-end switch or terminal adapter. The
ISDN PRI Specification allows up to 2 minutes for a response. Check the Error
Log for ATM-SGRP errors of type 2305 for evidence of a Remote Layer 3 Query
failure.
Test #636 checks the health of the D channels and ATM Interface circuit packs.
This test goes one step further by checking the communication path from the
processor, through the TDM/packet bus and ATM Interface circuit pack, and on to
the far-end switch or terminal adapter. A special ISDN message is sent to the
far-end switch or terminal adapter that must respond within a specified amount of
time. This test is designed to ensure that the communication path between the
switch and the far end is up and operational, and that the two endpoints can
properly exchange ISDN control messages.
8-262 Issue 1 May 2002
and follow recommendations provided there.
Query test may still fail if the signaling channel at the far end has not been
administered correctly or if the signaling channel has been busied out.
administered correctly.
D channels have not been busied out.
Continued on next page
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