100GbE beyond 40km

Mon Sep 27 17:08:32 UTC 2021

There is a cryo folder on c:\ which contains all the tables and so forth 
I guess we coukd zip that up, I very much doubt I can re-add the machine 
to xp but i will give it a shot no harm if its only for a rdp session.
cryo as in cryochamber

Sent via BT Email App
From: Randy Carpenter <rcarpen at network1.net>
Sent: 27 September 2021 17:40:19 BST
To: Dan Murphy <dmurphy at pilotfiber.com>
Cc: nanog <nanog at nanog.org>
Subject: Re: 100GbE beyond 40km

Looking at EDFA options... they are all ~1500nm as far as I can tell. Is 
there a specific model you are talking about?

thanks,
-Randy

----- On Sep 27, 2021, at 10:25 AM, Dan Murphy <dmurphy at pilotfiber.com> 
wrote:

> 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 
<mailto: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 <mailto: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>

-- 

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

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