Synchronous transmissions require a clock to send or receive data.

Question

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Synchronous transmissions are organized around a common clock signal that is used to synchronize the transmission and reception of data. Without a clock signal, it would be difficult to ensure that both the sender and receiver are operating at the same speed and are processing data at the same rate. Therefore, synchronous transmissions do require a clock signal to be present in order to operate correctly.

Synchronous Transmissions Require a Clock to Send or Receive Data