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Local Area High Speed Networks by Dr. Sidnie Feit

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Ethernet 10BASE5, 10BASE2, and 10BASE-T Manchester Encoding

Data is transmitted onto 10Mbps coaxial cable and 10Mbps twisted-pair LAN media using a method called Manchester encoding. For each 0 and 1 transmitted across the medium:

  • The encoded representation of the bit has a voltage transition at its midpoint.

  • For a 0-bit, the first half is high and the second half is low.

  • For a 1-bit, the first half is low and the second half is high.

Figure A.1 shows the Manchester pattern for 1 0 1 1 1 0 0 1.

Figure A.1. Manchester encoding.

The fact that there is a transition within each bit makes it easy for a receiver to synchronize its timing with ...

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