The LQG board reports the ALM_DATA_RLOS and ALM_DATA_TLOS alarms transiently because the channel does not carry services.
Fault Type
Transient Interruption
Ethernet Service
Protection
Equipment Interconnection
Optical Transponder Unit
ALM_DATA_RLOS
ALM_DATA_TLOS
Symptom
The working and protection LQG boards are configured with the WXCP protection to enable the channel protection. The transmit end of the working path on the WDM side is #151-11-LQG-1 (#151 is the name of the NE, 11 is the slot of the board, LQG is the name of the board, and 1 is the optical interface of the board) and the receive end is #161-2-LQG-1. The transmit end of the protection path is #151-10-LQG-1. Then, the services in the protection path pass through #150, #157, #158, and #160 NEs and arrive at #161-3-LQG-1. Two GE services (#151-11-LQG-3/4←→#161-2-LQG-3/4) are configured. The fourth optical interfaces on the working and protection LQG boards at #151 and #161 NEs keep reports the ALM_DATA_RLOS and ALM_DATA_TLOS transiently.
Cause Analysis
The ALM_DATA_RLOS alarm indicates that no service is accessed. The ALM_DATA_TLOS alarm indicates that the corresponding channel on the WDM side does not carry services. The ALM_DATA_RLOS alarm is generated at the opposite station when no actual service is accessed at the local station. The channel, however, is actually carry services according to the feedback from the customer. The LQG-4 and the Alcatel router are checked for the interworking problems. Then, use the ping command to substitute the services. The ALM_DATA_RLOS and ALM_DATA_TLOS alarms are no longer reported at the fourth optical interfaces on the working and protection LQGs at #151 and #161 NEs. It indicates that the channel is connected physically but does not carry actual services. Hence, the fourth optical interfaces on the working and protection LQG boards at #151 and #161 NEs keep reports the ALM_DATA_RLOS and ALM_DATA_TLOS transiently.
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