Comment by johncolanduoni
11 hours ago
I’m sure it depends on the model, but in my experience if you force a 10G copper transceiver to 2.5G the insane heat generation goes away. I don’t have any Thunderbolt 10G adapters, but I’m kind of surprised they’re much larger. A SFP+ transceiver is the same size as a SFP one.
I think a major reason for the size is for heat dissipation, because it has to be prepared to handle the heat of a full 10G copper connection. Mine runs hot.
Most of my cables coming out of the aggregation switch are DAC and fiber, but there is no 10G copper because my PC came with 10G copper NIC integrated. Anyway, the difference in heat between this transceiver is shockingly large.
I knew it runs hot before I deployed it, but I wasn't aware that you have to wait for it to cooldown before unplugging, or you get burnt.