Hello, everyone!
Today, I'd like to share a case with you.
Problem Description
requirement:
1 Metro DWDM ring
4 NEs in the ring
Equipment Type: OSN 1800 I/II
2 x10GE service per segment using TNF2LSX
1st 10GE client equipment is an Alcatel 7450
2nd 10GE is a spare for migration to Huawei CX600
In one of the segments, the service unable to go up.
Alarms are as follows:
Site A: ODU2_PM_OCI in both LSX
Site B: LINK_ERR in both LSX
Problem Analysis
1. Troubleshooting details:
Verify the link commissioning - OK
Check on higher alarms – LINK ERR on both LSX in Site B
Check for loopback on both cards - NONE
LSX hardware reset – Alarm still did not clear
2. Alarm is still present after all the troubleshooting done in Item No.3.
Root Cause
possible reasons:
1. The corresponding board at the upstream station has the ODU2_PM_OCI alarm. - None as checked
2. There is loopback on the corresponding board at the opposite station. - None as checked
3. The corresponding board at the opposite station has no cross-connection configuration and enable the non-intrusive monitoring function at the local station. - No electrical cross-connection (XC) as checked. But based on experience, there is no need to create an electrical cross-connection on LSX and OSN 1800 does not support electrical XC function.
Solution Description
Attempted to create an electrical XC on LSX. The alarm was cleared.
Thank you!
