Quote:
I believe that GigE is not CSMA/CD, unlike prior versions of Ethernet. But I might be making that up.

By the look of this, all the IEEE 802.3 stuff, up to and including 10GBASE-whatever, is CSMA/CD. I seem to remember, very vaguelly, an ancient competition of 100Mb/s proposals, one keeping the old 10Mb/s Ethernet frame format, another MAC protocol.
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue