![]() ![]() The IBM Binary Synchronous protocol (Bisync) is still in use, Other examples of byte-oriented protocols are IBM's Synchronous transmit-receive (STR), and Digital Data Communications Message Protocol (DDCMP) from Digital Equipment Corporation. A certain number of idles were sent prior to each transmission. Over time the transmitting and receiving clocks will tend to drift apart, requiring resynchronization.Įarly synchronous protocols were byte-oriented protocols, where synchronization was maintained by transmitting a sequence of synchronous idle characters when the line was not actively transmitting data or transparently within a long transmission block. For this reason "synchronous communication permits more information to be passed over a circuit per unit time" than asynchronous serial communication. Synchronous communication requires that the clocks in the transmitting and receiving devices are synchronized – running at the same rate – so the receiver can sample the signal at the same time intervals used by the transmitter. Synchronous serial communication describes a serial communication protocol in which "data is sent in a continuous stream at constant rate."
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