Freescale Semiconductor TWR-MCF52259-Ethenet - Manual (Page 11)

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Full Duplex Half Duplex
Full duplex operation means that devices at each end of a full duplex
link can send and receive data simultaneously .
This means, theoretically, that Full Duplex has twice the bandwidth of
normal (half duplex) Ethernet.
Since there are only two devices on a full duplex link, there is no shared
channel and no collisions.
DTE R
DTE
DTE DTE S
DTE
DTE
CSMA/CD protocol
prevents this
Full Duplex Ethernet Links