[195087] in North American Network Operators' Group
Re: PCIe adapters supporting long distance 10GB fiber?
daemon@ATHENA.MIT.EDU (Mikael Abrahamsson)
Wed Jun 21 01:43:09 2017
X-Original-To: nanog@nanog.org
Date: Wed, 21 Jun 2017 07:40:13 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Denys Fedoryshchenko <denys@visp.net.lb>
In-Reply-To: <45058675603762696050ded93c7752e4@nuclearcat.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Wed, 21 Jun 2017, Denys Fedoryshchenko wrote:
> For switches i guess it is same story as for PoE on them - total power
> budget matters. So if you will pack whole EX4500 with 10G 80km SFP+ it
> might have problems as well, but for normal use, and if few only are
> "long distance/high power", at any case 3.3V supply rail by design in
> switch should handle many SFP, so if there is 48 ports, it should handle
> by specs at least 72W peak load. It might be multiple power rails for
> groups of ports, but still, much better than just 750mA on network card.
> But that's just guessing, i never seen circuit diagrams of good
> switches, or at least reference design, as it is all NDA material.
Several of the limitations in switches/routers comes out to cooling,
especially since there is a requirement for normal operation in case of
failed climate control with ambient temp in the 40-50C range.
--
Mikael Abrahamsson email: swmike@swm.pp.se
