2-13
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.5.4 Alarm Hierarchy
Near-end failures and far-end failures follow different hierarchies. Near-end failures stand according to
whether they are for the entire signal (LOS, LOF), facility (MS-AIS), path (AU-AIS, etc.) or VT
(TU-AIS, etc.). The full hierarchy for near-end failures is shown in
. This table is taken from
Telcordia GR-253-CORE.
The far-end failure alarm hierarchy is shown in
, as given in Telcordia GR-253-CORE.
—
HP-TIM
Lowest
HP-PLM
1.
This alarm is not currently used in the platform.
Table 2-10
Facility Alarm Hierarchy
Priority
Condition Type
Table 2-11
Near-End Alarm Hierarchy
Priority
Condition Type
Highest
LOS
—
LOF
—
MS-AIS
—
AU-AIS
1
1.
Although it is not defined as a defect or failure, all-ones VT pointer relay is also
higher priority than AU-LOP. Similarly, all-ones VC pointer relay is higher
priority than TU-LOP.
—
AU-LOP
2
2.
AU-LOP is also higher priority than the far-end failure MS-RFI, which does not
affect the detection of any near-end failures. Similarly, TU-LOP is higher priority
than LP-RF.
—
HP-UNEQ
—
HP-TIM
—
HP-PLM
—
TU-AIS
—
TU-LOP
—
LP-UNEQ
3
3.
This alarm is not used in this platform in this release.
—
LP-PLM
Lowest
DS-N AIS (if reported for
outgoing DS-N signals)
Table 2-12
Far-End Alarm Hierarchy
Priority
Condition Type
Highest
MS-RDI
1
—
HP-RFI
Lowest
LP-RFI
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