PCIe adapters supporting long distance 10GB fiber?

Mikael Abrahamsson swmike at swm.pp.se
Wed Jun 21 05:40:13 CST 2017

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 at swm.pp.se

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