nanog mailing list archives
Re: 100GbE beyond 40km
From: Lady Benjamin Cannon <lb () 6by7 net>
Date: Sat, 25 Sep 2021 21:14:22 -0700
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 <bblackford () gmail com <mailto:bblackford () 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 <rcarpen () network1 net <mailto:rcarpen () 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>
Current thread:
- 100GbE beyond 40km Randy Carpenter (Sep 24)
- Re: 100GbE beyond 40km Dan Murphy (Sep 24)
- Re: 100GbE beyond 40km Mauricio Rodriguez via NANOG (Sep 24)
- Re: 100GbE beyond 40km Eric Litvin (Sep 24)
- Re: 100GbE beyond 40km Tarko Tikan (Sep 24)
- Re: 100GbE beyond 40km Bill Blackford (Sep 24)
- Re: 100GbE beyond 40km Etienne-Victor Depasquale via NANOG (Sep 25)
- Re: 100GbE beyond 40km Lady Benjamin Cannon (Sep 25)
- Re: 100GbE beyond 40km Dan Murphy (Sep 27)
- Re: 100GbE beyond 40km Randy Carpenter (Sep 27)
- Re: 100GbE beyond 40km touseef.rehman1--- via NANOG (Sep 27)
- Re: 100GbE beyond 40km Brandon Butterworth (Sep 27)
- Re: 100GbE beyond 40km Brandon Martin (Sep 28)
- Re: 100GbE beyond 40km Etienne-Victor Depasquale via NANOG (Sep 25)
- Re: 100GbE beyond 40km Edwin Mallette (Sep 24)
- Re: 100GbE beyond 40km Lady Benjamin Cannon of Glencoe, ASCE (Sep 24)
- Re: 100GbE beyond 40km Colton Conor (Sep 25)