Comment by teleforce
6 days ago
Just wondering why you considered DAC cables cheating, is the analog magic mainly the impedance matching or I'm missing something?
6 days ago
Just wondering why you considered DAC cables cheating, is the analog magic mainly the impedance matching or I'm missing something?
DAC cables are cheating because due to the extremely short range limits (5m, 7m if you're very lucky) they can just put the 10Gbase-R/SFI signal straight on a pair of Copper at 10.3125 Gbaud.
10Gbase-T, to try to get to 100m, throws FEC on it and converts the signal to 4x PAM-16/THP at 800 Mbd, and then uses 4 copper pairs *bidirectionally*. That's the analog magic.