3 ms·
Interesting... my experience has been the opposite, but I will admit I am not a network engineer. I've burned my fingers on SFP modules a few times, however. D
by mmastrac 4y ago
Interesting... my experience has been the opposite, but I will admit I am not a network engineer. I've burned my fingers on SFP modules a few times, however.
Do you think that power requirements are different because SFP often uses direct-attach copper?
I'm honestly curious to reconcile my experience with other, more experience persons' reality here.
- coder543 4y agoI believe both DAC and fiber draw about the same power, but DAC obviously has very limited cable lengths. I’m not entirely sure why regular ethernet draws more power, I just know this is a fairly consistent thing wherever I look. Handling the SFP module itself will more directly expose you to the heat than an integrated ethernet port, so maybe that’s the difference.
- mmastrac 4y ago> Handling the SFP module itself will more directly expose you to the heat than an integrated ethernet port, so maybe that’s the difference. This would explain a lot, TBH. Thanks for the productive discussion -- it helped me realize a few gaps in my knowledge
- washadjeffmad 4y agoOur old RJ45 transceivers always caused the cards to run at the maximum wattage required for the longest supported run of cable. I don't recall if it was a quirk of the spec or a lack of sensing.
- justsomehnguy 4y agoDAC transcievers are always hotter than a fiber ones, easily tested by handling them (for a comparable speeds) in one chassis. And on the minor note - external SAS connectors (6/12gbps) are more then just warm, too. My own experience, YMMW.