Synchronous serial communication

In synchronous data transfer, the transfer of individual bits between the transmitter and the receiver is synchronized with a clock signal in time. This clock signal may be sent via its own interface line or to be recovered by the receiver from the data signal. This is called " clock recovery ".

A synchronous transmission of signals is present when a rigid phase relationship over several symbol characters between them away. A necessary condition is cause therefore must be the same clock frequencies between the transmitter and receiver.

The counterpart is the asynchronous data transmission, in which between individual groups of symbols of any length (or random long ) breaks can occur, thus no rigid phase relationship longer present.

Demarcation

The synchronous data transmission should not be confused with the concept of synchronous communication, which refers to the sequence of request and response in a communication protocol.

• Communications Engineering