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Maintenance Object Repair Procedures
555-233-123 10-970 Issue 4 May 2002
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.
Figure 10-53. Remote Layer 3 Query (Test #637)
PI
TDM
BUS
DS-1
TO FAR-END
(TN765)
PROCESSOR
CIRCUIT
PACK CIRCUIT
PACK
PROCESSOR
(TN786)
INTERFACE