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DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-727ISDN-SGR (ISDN-PRI Signaling Group)
3
Remote Layer 3 Query (#637)
This test will query the far-end switch or terminal adapter to determine if the
signaling connection is functioning properly at Layer 3. It will select a B-channel
in the in-service or maintenance service state and send 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 will not be performed if there are
no B-channels in an appropriate ISDN service state (as 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 ISDN-SGR (ISDN-PRI Signaling Group) errors of type 2305 for evidence
of a Remote Layer 3 Query failure.
Tests #639 and #636 check the health of the D-channels and DS1/UDS1
Interface Circuit Packs. As shown in the figures below, Test #637 goes one step
further by checking the communication path from the processor over the TDM
Bus, through the DS1/UDS1 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, which 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.
See Figure 3-23
for DS1 connections, Figure 3-24 for UDS1 connections.
8 FAIL There is a problem with the DS1/UDS1 Circuit Pack, or the ISDN-PRI
Signaling Channel (D-channel). No DS1 ISDN Trunk (B-channel) or
wideband PRI Endpoint calls can be made until the problem is resolved.
1. Consult the procedures for DS1/UDS1 Circuit Pack and the ISDN-PRI
Signaling Channel (ISDN-LNK/ISDN-PLK).
PASS The basic physical connectivity of the primary D-channel is intact and
functional. Try this test repeatedly to ensure the link is up and to uncover
any transitory problems.
Table 3-305. TEST #636 Primary Signaling Link Hardware Check — Continued
Error
Code
Te s t
Result Description/ Recommendation
Continued on next page