100GbE beyond 40km

Sun Sep 26 04:14:22 UTC 2021

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 at 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 at gmail.com <mailto:bblackford at 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 at network1.net <mailto:rcarpen at 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>

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