Cisco Systems ONS 15310-CL, ONS 15310-MA Lowest DS-N AIS if reported for Outgoing DS-N signals

Chapter 2 Alarm Troubleshooting

2.5.4 Alarm Hierarchy

Table 2-10	Facility Alarm Hierarchy (continued)
Priority		Condition Type
—		SD-P
—		UNEQ-P
—		TIM-P
Lowest		PLM-P

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 2-11	Near-End Alarm Hierarchy
Priority		Condition Type
Highest		LOS
—		LOF
—		AIS-L
—		AIS-P1
—		LOP-P2
—		UNEQ-P
—		TIM-P
—		PLM-P
—		AIS-V1
—		LOP-V2
—		UNEQ-V
—		PLM-V
Lowest		DS-N AIS (if reported for
		outgoing DS-N signals)

1.Although it is not defined as a defect or failure, all-ones STS pointer relay is also higher priority than LOP-P. Similarly, all-ones VT pointer relay is higher priority than LOP-V.

2.LOP-P is also higher priority than the far-end failure RFI-P, which does not affect the detection of any near-end failures. Similarly, LOP-V is higher priority than RFI-V.

The far-end failure alarm hierarchy is shown in Table 2-12, as given in Telcordia GR-253-CORE.

Table 2-12 Far-End Alarm Hierarchy

Priority

Highest

—

Lowest

Condition Type

RFI-L

RFI-P

RFI-V

Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0

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