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ISDN-SGR (ISDN-PRI Signaling Group)
Issue 1 June 2005 1443
Layer 2 Status Test (#647)
The Layer 2 Status Test checks the layer-2 status of the ISDN-PRI Signaling Channel (D
channel). This test will fail if there is a hardware failure or a facility problem, or if the primary and
secondary ISDN-PRI D channels are not administered correctly.
The Primary and Secondary Signaling Link Hardware tests (test 637 and 639) and the Remote
Layer 3 Query test (#637) will detect most problems caused by hardware failures or incorrect
administration. However, this layer-3 test cannot detect end-to-end transmission problems with
the standby D channel since layer-3 messages are not sent on the standby channel.
For systems supporting circuit packs, the SYS-LINK MO reports layer-2 ISDN-PRI D-channel
problems and the PI-LINK MO reports layer-2 ISDN-PRI D-channel problems (if the D channel
is connected to the Processor Interface circuit pack). However, for some systems, the PI-LINK
MO does not monitor the layer-2 status of the ISDN-PRI D channel, when it is connected to the
Packet Control circuit pack for the ISDN-PRI over PACCON feature.
The Layer 2 Query test is provided to detect Layer-2 D-Channel failures and generate an
associated Warning alarm independent of the hardware configuration used for the D channels.
Table 519: Test #647 Layer 2 Status Query Test
Error
Code
Test
Result
Description / Recommendation
1132 ABRT Internal system error:
The port location for the primary ISDN-PRI D channel is not known. This
condition should not be possible since an administered DS1 circuit pack or
media module must be specified when a Signaling Group is administered:
1. Retry the command at 1-minute intervals up to 5 times.
1134 ABRT Internal system error:
The associated DS1 circuit pack or media module is not administered. This
condition should not be possible since an administered DS1 circuit pack or
media module must be specified when a Signaling Group is administered.
1. Retry the command at 1-minute intervals up to 3 times.
2500 ABRT Internal system error:
1. Retry the command at 1-minute intervals up to 5 times.
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