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Networks: Data Encoding

9

Bi –Phase Codes

Bi- phase codes – require at least one transition per bit time and may have as many as two transitions.

the maximum modulation rate is twice that of NRZ greater transmission bandwidth is required.

Advantages:

Synchronization – with a predictable transition per bit time the receiver can “synch” on the transition [self-clocking]

No d.c. component

Error detection – the absence of an expected transition can used to detect errors.

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