constant FEC errors juniper mpc10e 400g
Mark Tinka
mark at tinka.africa
Fri Apr 19 07:51:33 UTC 2024
On 4/19/24 08:01, Saku Ytti wrote:
> The frames in FEC are idle frames between actual ethernet frames. So
> you recall right, without FEC, you won't see this idle traffic.
>
> It's very very good, because now you actually know before putting the
> circuit in production, if the circuit works or not.
>
> Lot of people have processes to ping from router-to-router for N time,
> trying to determine circuit correctness before putting traffic on it,
> which looks absolutely childish compared to FEC, both in terms of how
> reliable the presumed outcome is and how long it takes to get to that
> presumed outcome.
FEC is amazing.
At higher data rates (100G and 400G) for long and ultra long haul
optical networks, SD-FEC (Soft Decision FEC) carries a higher overhead
penalty compared to HD-FEC (Hard Decision FEC), but the net OSNR gain
more than compensates for that, and makes it worth it to increase
transmission distance without compromising throughput.
Mark.
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