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INTRA_OTU_PS reported between an OSN1800 connection

Publication Date:  2019-01-31 Views:  349 Downloads:  0

Issue Description

Customer reported INTRA_OTU_PS alarm between an OSN1800 connection, and just one node reported a switch process.

Alarm Information

- Major 12539 INTRA_OTU_PS XXX-OSN1800V-2E8-01 - 12/21/2017 10:46:40 01/28/2019 11:50:14 - 1-Slave Shelf1-4-OLPN-1(XXX-YYY OSN-ring 100G_2 W)-OTS:1 13 - - - - - - 907745 300208 Normal

Handling Process

The INTRA_OTU_PS alarm indicates 1+1 protection switching within an OTU board. This alarm is reported when services are switched from the working channel to the protection channel in an intra-board 1+1 protection group.

1. We checked the OPLOG, confirmed that customer didn’t do anything at the time, so the alarm reported by the operation is excluded.

2. We checked the DC data, confirmed that the cause of the alarm is that the optical power of the working link drops.

2019-01-28  [02:50:14]    0x0029    2019-01-28  02:50:14:0x044dfb52, PgId:    2, [SWITCH_EVENT], CurWork:0, CurReq:0xc, WorkState:2, BackState:0 .   

After 4 seconds, the working link recovered

2019-01-28  [02:50:18]    0x0029    2019-01-28 02:50:18:0x048d31a9, PgId:    2, [TRANSFER_EVENT], CurWork:0, CurReq:0x0, WorkState:0, BackState:0 .  

Root Cause

Because the No.2 1+1 protection configured no-restore, so even working link recovered, the 1+1 protection will not switched back to the working link, and the alarm will not cleared


 To clear the alarm automatically, 1+1 protection should be configured as restore