nanog mailing list archives
Re: constant FEC errors juniper mpc10e 400g
From: Saku Ytti <saku () ytti fi>
Date: Fri, 19 Apr 2024 11:08:20 +0300
On Fri, 19 Apr 2024 at 10:55, Mark Tinka <mark@tinka.africa> wrote:> 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.
Of course there are limits to this, as FEC is hop-by-hop, so in long-haul you'll know about circuit quality to the transponder, not end-to-end. Unlike in wan-phy, OTN where you know both. Technically optical transport could induce FEC errors, if there are FEC errors on any hop, so consumers of optical networks need not have access to optical networks to know if it's end-to-end clean. Much like cut-through switching can induce errors via some symbols to communicate the CRC errors happened earlier, so the receiver doesn't have to worry about problems on their end. -- ++ytti
Current thread:
- Re: constant FEC errors juniper mpc10e 400g, (continued)
- Re: constant FEC errors juniper mpc10e 400g Tom Beecher (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Aaron Gould (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Tom Beecher (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Aaron Gould (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g JÁKÓ András (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Charles Polisher (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Tom Beecher (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Saku Ytti (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 19)
- Re: constant FEC errors juniper mpc10e 400g Saku Ytti (Apr 19)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 20)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 20)
- Re: constant FEC errors juniper mpc10e 400g Saku Ytti (Apr 20)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 20)
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- Re: constant FEC errors juniper mpc10e 400g Saku Ytti (Apr 20)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 20)
- Re: constant FEC errors juniper mpc10e 400g Tarko Tikan (Apr 20)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 20)
- RE: constant FEC errors juniper mpc10e 400g Vasilenko Eduard via NANOG (Apr 22)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 22)