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CITS3002 Computer Networks |
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Phase Encoding of Signals, continuedNRZ-L and NRZ-I are simple schemes, but unfortunately offer no possible synchronization. Another scheme, biphase encoding, ensures that there will be a transition in the middle of each bit. With Traditional Manchester encoding the mid-bit transition provides a clocking mechanism (as well as the data). With Differential Manchester the mid-bit transition provides the clocking and the initial transition provides the data.
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Biphase encoding schemes have (at least) one transition per bit time,
thus the maximum modulation rate,
or baud rate,
is twice that for NRZ-L and NRZ-I.
CITS3002 Computer Networks, Lecture 2, The Physical Layer, Errors detection and correction, p8, 6th March 2024.
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