Phase Encoding of Signals, continued

NRZ-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.

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.