Digital Data Communication Techniques:
For 2 devices connected by a transmission medium to exchange data, a large degree of co-operation is necessary. Normally data is transmitted 1-bit at a time. The timing (rate, duration, spacing) of these bits have to be same for transmitter and receiver. There are only two options for transmission of bits.
1. Parallel All bits of a byte are transferred at the same time on separate parallel wires.
Synchronization between multiple bits is essential which becomes difficult over long distance. Gives huge band width but expensive. Practical only for those devices that are close to each other.
2. Serial Bits transferred successively one after other. Gives low bandwidth but cheaper. Good for transmission over long distances.
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