100GbE beyond 40km

Mon Sep 27 14:25:40 UTC 2021

> Are you saying we could use normal QSFP28 LR4 or ER4 modules with an
amplifier in between?
Yes, that is the idea from 30,000 ft. Fun fact, the ER4 optics you mention
are amplified inside the pluggable in a very similar manner to how these
EDFA systems work.

Basically: QSFP28 100G ER <-> EDFA Amp <-> OSP/dark fiber <-> EDFA Amp <->
QSFP28 100G ER
Very simple, and from the Juniper gear's POV, there is no funny business.
All the magic happens down at layer 0.

The systems are commoditized and pretty easy to find. I saw a few people on
this thread mention Solid Optics, personally I have not heard of them, but
I would trust LB's recommendation. I've used systems by other manufacturers
in the past and wasn't crazy about them. I don't want to flame that
manufacturer since they read this mailer, and who knows, the issues I saw
might have been isolated to manufacturing issues, but I still wouldn't
recommend them.

The learning curve is pretty low, and the manufacturers of this gear are
~usually~ very eager to guide basic implementation. However, ping me off
list, or on here, if you have any deeper questions about this.

Have a good week everyone!

On Sun, Sep 26, 2021 at 12:17 AM Lady Benjamin Cannon <lb at 6by7.net> wrote:

> 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>
> 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>
>> 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
>
>
>

-- 
Daniel Murphy
Senior Data Center Engineer
(646) 698-8018
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