Re: 100GbE beyond 40km

[Steven Karp <smkarp () galliumnetworks com>]

If you can’t wait for Juniper to release their supported QSFP28 100G-ZR optic, shop for third party 100G-ZR optics.  I 
know many networks are already using third party QSFP28 100G-ZR optics in Juniper routers.  I have one 80 km span 
between two MX204 routers using third party 100G-ZR optics with no issues.   As long as the optic doesn’t draw too much 
power or generate too much heat it should be good.


From: NANOG <nanog-bounces+smkarp=galliumnetworks.com () nanog org> on behalf of Joe Freeman <joe () netbyjoe com>
Date: Friday, September 24, 2021 at 4:30 PM
To: Randy Carpenter <rcarpen () network1 net>
Cc: nanog <nanog () nanog org>
Subject: Re: 100GbE beyond 40km

Open Line Systems can get you to 80K with a 100G DWDM Optic (PAM4) -

I've used a lot of SmartOptics DCP-M40 shelves for this purpose. They also have transponders that allow you to go from 
a QSFP28 to CFP to do coherent 100G out to 120Km using the DCP-M40, without a need for regen or extra amps in line.

The DCP-M40 is a 1RU box. It looks like a deep 40ch DWDM filter but includes a VAO, EDFA amp, and a WSS I think.

On Fri, Sep 24, 2021 at 4:40 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