Rim Semiconductor Company (fka RSMI)

[lanrex]

ethernet physical layer(PHY) is also defined in the 802.xxx spec where it can be twisted pair fiber or wireless. with physical transmission perimeters defined for all of them. typically your pc has 802.3 which has a physical transmission defined for twisted pair CAT3 or CAT5. 803.3ab would be gigabit ethernet which also has a seperate physical definition for copper,and fiber. so ethernet can also have a physical definition. what really matters is how far and at what bit rate. I don't care if you call it ADSL, VDSL, QAM, CAP, AM, FM. saying there is an ethernet interface just makes it easier to inteface/design a router/switch with existing technology and infrastructure. So when a company says they are transmitting ethernet 25Mbps to 4k feet that means alot to me and I don't care what the modulation is as long as what I put in is what I get out. It could easly be ethernet with a QAM modulation, or ethernet over ADSL, or VDSL.

also ethernet packets are not resent because they arrive out of sequence, they are only resent if there is an error, and they are not a voice packet.