Filter
Top Products
DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-738ISDN-SGR (ISDN-PRI Signaling Group)
10
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, through the
Processor Interface or Packet Control circuit pack over the TDM or Packet 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.
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 10-243. TEST #636 Primary Signaling Link Hardware Check — Continued
Error
Code
Test
Result Description/ Recommendation
Continued on next page