<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div>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.</div><div><br class=""></div><div>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 </div><div><br class=""></div><div>(This is a guess, there’s a chance something else was meant by this)</div><div><br class=""></div><div>-LB.</div><div><br class=""><blockquote type="cite" class=""><div class="">On Sep 25, 2021, at 1:55 AM, Etienne-Victor Depasquale via NANOG <<a href="mailto:nanog@nanog.org" class="">nanog@nanog.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Bear with my ignorance, I'm genuinely surprised at this:<div class=""><br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Does this have to be Ethernet? You could look into line gear with coherent optics.<br class=""></blockquote><div class=""><br class=""></div><div class="">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 ?</div><div class=""><br class=""></div><div class="">Please don't flame me, I'm just ignorant and willing to learn.</div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">Etienne</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 24, 2021 at 11:25 PM Bill Blackford <<a href="mailto:bblackford@gmail.com" class="">bblackford@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class="">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.</div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 24, 2021 at 1:40 PM Randy Carpenter <<a href="mailto:rcarpen@network1.net" target="_blank" class="">rcarpen@network1.net</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br class="">
How is everyone accomplishing 100GbE at farther than 40km distances?<br class="">
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Juniper is saying it can't be done with anything they offer, except for a single CFP-based line card that is EOL.<br class="">
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There are QSFP "ZR" modules from third parties, but I am hesitant to try those without there being an equivalent official part.<br class="">
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The application is an ISP upgrading from Nx10G, where one of their fiber paths is ~35km and the other is ~60km.<br class="">
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thanks,<br class="">
-Randy<br class="">
</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="">Bill Blackford<br class=""><br class="">Logged into reality and abusing my sudo privileges.....</div>
</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="gmail_signature"><div dir="ltr" class=""><span style="color:rgb(136,136,136);font-family:tahoma,sans-serif" class="">Ing. Etienne-Victor Depasquale</span><br style="color:rgb(136,136,136);font-family:tahoma,sans-serif" class=""><span style="color:rgb(136,136,136);font-family:tahoma,sans-serif" class="">Assistant Lecturer</span><br style="color:rgb(136,136,136);font-family:tahoma,sans-serif" class=""><span style="color:rgb(136,136,136);font-family:tahoma,sans-serif" class="">Department of Communications & Computer Engineering</span><br style="color:rgb(136,136,136);font-family:tahoma,sans-serif" class=""><span style="color:rgb(136,136,136);font-family:tahoma,sans-serif" class="">Faculty of Information & Communication Technology</span><br style="color:rgb(136,136,136);font-family:tahoma,sans-serif" class=""><span style="color:rgb(136,136,136);font-family:tahoma,sans-serif" class="">University of Malta</span><div class="">Web. <a href="https://www.um.edu.mt/profile/etiennedepasquale" target="_blank" class="">https://www.um.edu.mt/profile/etiennedepasquale</a><br class=""></div></div></div>
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