[179607] in North American Network Operators' Group
Re: DWDM and EDFA and DCM
daemon@ATHENA.MIT.EDU (Mikael Abrahamsson)
Wed Apr 22 14:33:54 2015
X-Original-To: nanog@nanog.org
Date: Wed, 22 Apr 2015 20:33:49 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Rodrigo Augusto <rodrigo@1telecom.com.br>
In-Reply-To: <D15D6BA1.378D8%rodrigo@1telecom.com.br>
Cc: nanog <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Wed, 22 Apr 2015, Rodrigo Augusto wrote:
> Does anyone have some experience to use dwdm monofiber mux/demux ( ex.
> fiberstore ) about 68km using a ADFA ? Have I to use a DCM( for chromatic
> dispersion ) on this distance? When I have to use a DCM ?
You have to use DCM when the chromatic dispersion caused by your distance
exceeds what your receiver optical module can handle.
So the answer is "it depends". If you're using 1GBASE-DWDM optics then
you'll be fine, if you use 10GBASE DWDM optics then it depends on the
distance they were designed to handle, if you buy the 40km ones then you
should have DCM.
--
Mikael Abrahamsson email: swmike@swm.pp.se
