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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, Release 9.0

78-18394-01

Chapter 2 Alarm Troubleshooting

Trouble Notifications

Facility (port) alarms also follow a hierarchy; lower-ranking alarms are closed by higher-ranking alarms.

The facility alarm hierarchy used in the systems is shown in Table 2-10.

Near-end failures and far-end failures follow different hierarchies. Near-end failures stand according to

whether they are for the entire signal (LOS, loss of frame alignment [LOF]), facility (AIS-L), path

(AIS-P, etc.) or VT (AIS-V, etc.). The full hierarchy for near-end failures is shown in Table 2-11. This

table is taken from Telcordia GR-253-CORE.

Table 2-10 Facility Alarm Hierarchy

Priority Condition Type

Highest LOS

—LOF

—AIS-L

— SF-L

—SD-L

—RFI-L

—TIM-S

—AIS-P

—LOP-P

— SF-P

—SD-P

— UNEQ-P

—TIM-P

Lowest PLM-P

Table 2-11 Near-End Alarm Hierarchy

Priority Condition Type

Highest LOS

—LOF

—AIS-L

—AIS-P

—LOP-P

— UNEQ-P

—TIM-P

—PLM-P

—AIS-V

—LOP-V

— UNEQ-V

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