On this page:
"Note that pins 4, 5, 7, and 8 and the blue and brown pairs are not used in
either standard. Quite contrary to what you may read elsewhere, these pins
and wires are not used or required to implement 100BASE-TX
duplexing--they are just plain wasted."
I presume this to mean "full-duplexing" in 100BASE-TX.
If so, what is the basis of this statement?
Several other references suggest a second tx/rx pair is necessary for full duplex ethernet.
Incidentally, the documentation for my 3com NIC, which supposedly supports full-duplex,
only shows pins 1,2,3, and 6 being used.