The transceivers get up to 90-95°C (enough to leave a little burn!) if you plug them next to each other.
They can work in that configuration (with up to 4 in that enclosure) but I'd only do it if you have a fan on the thing. It relies entirely on passive ventilation, and the enclosure gets hot, too, like 60°C or more!
Oh hey I just read the post about transceivers being slow only in one direction. I have the same problem on a different scale. Two X520T cards, one in a Dell T20 and the other in a Dell T30. Both connected with DACs to the CRS305. 9.something Gbps one direction, 7.something Gbps the other.
I haven't bothered to do much actual diagnosis on this because I'm satisfied with the speed as-is, but it's another illustration of weirdness where you'd least expect it.
Yeah; I've noticed asymmetric speeds in certain situations with the CRS305 as well... I thought it was just me, but I'm glad (sad?) to know someone else sees the same thing too :)
They can work in that configuration (with up to 4 in that enclosure) but I'd only do it if you have a fan on the thing. It relies entirely on passive ventilation, and the enclosure gets hot, too, like 60°C or more!