Galen Seitz wrote: > 10BASE-T and 100BASE-TX only require 2 pairs. There was a version of > 100Mbit that required 4 pairs(100BASE-T4), but I believe it is > obsolete. Anyone still using 100BASE-T4 would almost certainly be > aware of that fact. > http://en.wikipedia.org/wiki/Ethernet_over_twisted_pair > http://en.wikipedia.org/wiki/Fast_Ethernet#100BASE-T4 > > Gigabit ethernet(1000BASE-T) requires 4 pairs.). In its typical configuration, 100BASE-TX uses one pair of twisted wires in each direction, providing 100 Mbit/s of throughput in each direction (full-duplex). Which means that the link could be good, but the cable wouldn't support full-duplex mode. So in theory the NIC might support full-duplex but the Ethernet cable w. a broken wire doesn't. And then you have a duplex mis-match between the 2 end devices. You drop in the 10-base-T hub, which most likely doesn't support auto-neg / full-duplex and it magically works. If I recall, the Orig Poster said he did see Ethernet errors...
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