6.6. Autonegotiation
We have looked at four versions—10BaseT, 100BaseT4, 100BaseTX, and 100BaseT2—of twisted pair–based Ethernet transmission systems all using the same RJ-45 connector. Although each system has its own unique physical layer and different physical layers do not communicate with each other, it will be very beneficial for a pair of Ethernet transceivers to at least recognize each other and to find out the optimal common physical layer with which they can communicate when they are connected. Because the 10BaseT transmission system requires the simplest transceiver circuits, an autonegotiation procedure has been defined in the Ethernet standards based on its link integrity test pulse sequence, and no packet or upper layer protocol ...
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