Maintenance-Object Repair Procedures
555-233-143
8-984 Issue 1 May 2002
Remote Layer 3 Query (#637)
This test will query the far-end switch or terminal adapter to determine whether
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 Figure 8-53, this test goes one step further by checking
the communication path from the processor from the processor, through the
TDM/packet bus and 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 8-53. Remote Layer 3 Query Test (#637)
Figure 8-53 illustrates a UDS1 Interface circuit pack located in the PN. When the
UDS1 board resides in an PN, there is additional Port Network Connectivity
hardware connecting the packet buses of the IPSI PN and PN. Examples of such
hardware are the Center Stage Switch and fiber-optic cables.
PKTINT
PACKET
BUS
UDS1
TN464C/D
TO FAR-END
(TN1655)
PROCESSOR
CIRCUIT
PACK CIRCUIT
PACK
PROCESSOR
(UN331)
INTERFACE
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