100GbE beyond 40km

Mon Sep 27 18:52:13 UTC 2021

We’ve had DCP-M boxes in service for a few years now on our +40km links, with their PAM4 100Gb optics. It’s been SO easy.

If I had the money, we’d throw DCP-M boxes at every link we have.

-Kevin Menzel

From: NANOG <nanog-bounces+kevin.menzel=sheridancollege.ca at nanog.org> On Behalf Of Joe Freeman
Sent: September 24, 2021 17:07
To: Randy Carpenter <rcarpen at network1.net>
Cc: nanog <nanog at nanog.org>
Subject: Re: 100GbE beyond 40km

This message was sent from outside of Sheridan College. Please be careful when opening attachments, clicking links, or responding to requests for information.

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 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
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