My guess is that he was talking about the difference between a 100gbit/sec stream of ethernet frames with no error correction, and a 112gbit/sec (or so, depending on scheme) stream of transport with FEC (Forward Error Correction - which is essentially just cramming extra bits in there incase they are needed.
Ethernet has to re-transmit instead, and that can cause performance degradation and jitter, until it just quits working altogether. Systems implementing FEC are much (This is a guess, there’s a chance something else was meant by this) -LB. > On Sep 25, 2021, at 1:55 AM, Etienne-Victor Depasquale via NANOG > <nanog@nanog.org> wrote: > > Bear with my ignorance, I'm genuinely surprised at this: > > Does this have to be Ethernet? You could look into line gear with coherent > optics. > > Specifically, do you mean something like: "does this have to be > IEEE-standardized all the way down to L1 optics?" Because you can transmit > Ethernet frames over line gear with coherent optics, right ? > > Please don't flame me, I'm just ignorant and willing to learn. > > Cheers, > > Etienne > > On Fri, Sep 24, 2021 at 11:25 PM Bill Blackford <bblackf...@gmail.com > <mailto:bblackf...@gmail.com>> wrote: > Does this have to be Ethernet? You could look into line gear with coherent > optics. IIRC, they have built-in chromatic dispersion compensation, and > depending on the card, would include amplification. > > On Fri, Sep 24, 2021 at 1:40 PM Randy Carpenter <rcar...@network1.net > <mailto:rcar...@network1.net>> wrote: > > How is everyone accomplishing 100GbE at farther than 40km distances? > > Juniper is saying it can't be done with anything they offer, except for a > single CFP-based line card that is EOL. > > There are QSFP "ZR" modules from third parties, but I am hesitant to try > those without there being an equivalent official part. > > > The application is an ISP upgrading from Nx10G, where one of their fiber > paths is ~35km and the other is ~60km. > > > > thanks, > -Randy > > > -- > Bill Blackford > > Logged into reality and abusing my sudo privileges..... > > > -- > Ing. Etienne-Victor Depasquale > Assistant Lecturer > Department of Communications & Computer Engineering > Faculty of Information & Communication Technology > University of Malta > Web. https://www.um.edu.mt/profile/etiennedepasquale > <https://www.um.edu.mt/profile/etiennedepasquale>
