synchronous protocol

In the late 1990s, synchronous protocols proved to be favourable.

Additional control information in each block allows for the definition of higher level functions within the synchronous protocol built into the I/O port.

Bit-oriented protocols are synchronous protocols that view the transmitted data as a stream of bits with no semantics, or meaning.

For synchronous protocols, control information in each block can contain the sequence number of the block so the receiver can request retransmission of specific blocks.

This is because it is always possible to layer asynchronous behaviour (which is what is required for message queuing) over a synchronous protocol using request-response semantics.

In 1984, Bob Scheifler of MIT replaced the synchronous protocol of W with an asynchronous alternative and named the result X.

There is also a synchronous protocol and many UART's can handle this too, but it is seldomly used since it requires both sides to have synchronized clocks.

Finally, while RPC is primarily a synchronous protocol, it is used asynchronously in DART in conjunction with mutexes, condition variables, and other types of locks.

A compatible SAML 1.1 implementation must implement SAML over SOAP over HTTP (a synchronous protocol binding).

Bristol Standard Asynchronous/Synchronous Protocol (BSAP) is an industrial automation protocol developed by Bristol Babcock and managed by Emerson.

Early 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.

Interfaces to these networks include TCP/IP and UDP, X.25, asynchronous protocols and several synchronous protocols, such as SDLC, HDLC, Bisync and others.

However, where Data Communications examined serial asynchronous and synchronous protocols, Network Protocols takes an in depth look at local and wide area protocols, specifically Ethernet, Token Ring, TCP/IP, Frame Relay, etc.

In mid-1983 an initial port of W to Unix ran at one-fifth of its speed under V; in May 1984, Scheifler replaced the synchronous protocol of W with an asynchronous protocol and the display lists with immediate mode graphics to make X version 1.

The performance loss relative to synchronous access is negligible, as most modern modems will use a private synchronous protocol to send the data between themselves, and the asynchronous links at each end are operated faster than this data link, with flow control being used to throttle the data rate to prevent overrun.