On 1/12/25 09:25, Mark Tinka wrote:
This sounds like a Ciena-specific issue.
I have found the below on their knowledge portal:
https://my.ciena.com/CienaPortal/s/article/6500-Submarine-How-to-clear-Loss-of-Alignment-Marker-alarm-on-M2M-port
https://my.ciena.com/CienaPortal/s/article/Waveserver-5-Intermittent-errors-BIP-errors-or-Loss-of-Alignment-Marker-on-the-equipment-connected-to-WS5-client-ports
We don't run Ciena, but I have reached out to a good mate at Ciena to
see if he is aware about this and if their kit is implicated. I'll let
you know when I hear back.
No feedback yet from my Ciena contact, but I finally got full access to
those knowledge articles.
The 6500 issue appears to be an AOC cable length difference between M2M
(mate-to-mate) ports. Ensuring the AOC cables are the same clears the
LOA alarm.
On Waveserver, the issue appears to be a software defect that appears
when certain ports are configured with both Ethernet and OTU4 profiles
for 400G services. Resolution is based on recreating the client service
or hard rebooting the line card. There is no mention of a software
upgrade, but since the article is from 2023, I'd expect that should
already have been done.
Both the 6500 and Waveserver have this issue only when 400G services are
delivered.
The articles do point to "submarine" applications, but I'd ignore that
since the equipment used for terrestrial and submarine is largely the
same (very minor differences in the line cards).
Will ping if my Ciena contact reaches back.
Would be good to validate the above with your provider, and let us know
please. Thanks.
Mark.
