PON Revert Failed

Description

Sent when the PON fails to switch back to the Primary PON in a 2:32 PON Protection scheme. This may also be set due to the Secondary PON not having a lower optical power level than the Primary PON. The optical network design should be defined such that the Secondary PON is 5dB lower than the Primary PON. This ensures that, in any switchover glare conditions that the Primary PON is strong enough to take control. The alarm is not service affecting, provided that the Secondary PON is actively posting a PON-ON-PROTECT (refer to PON On Protect alarm. If no PON-ON-PROTECT alarm is generated, this alarm becomes a critical service affecting alarm. The following criteria are supported:

• Set: The Primary PON attempts to take control of the PON by transmitting downstream signals, but all upstream signals are not destined for itself. This condition occurs when the optical power level from the Primary PON, at the input to the 2:32 splitter, is weaker than the optical power from the Secondary PON.
• Clear: Can only be cleared through administratively disabling the Primary PON, through the Panorama PON EMS (refer to "Modify Protection Group"in Tellabs 1100 Series Optical LAN Managing the PON Users Guide) or CLI (refer to "Interface > PON > Protection-Group > Edit" command in Tellabs 1100 Series Optical LAN Craft User Interface Guide), and then re-enabling the primary PON. The system must be able to switch back to the Primary PON.

Trouble Clearing

The probable cause of this alarm is: 

• Power level to the 2:32 splitter from the Primary PON has fallen below that from the Secondary PON or the Secondary PON was incorrectly provisioned as Secondary or is not running compatible software as the Primary PON.

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