A protocol is a system digital message formats and rules for exchanging those messages in or between computing systems and in telecommunications. A protocol may have a formal description. Protocols may include signaling, authentication and error detection and correction capabilities.
A protocol definition defines the syntax, semantics, and synchronization of communication; the specified behavior is typically independent of how it is to be implemented. A protocol can therefore be implemented as hardware or software . Communications protocols have to be agreed upon by the parties involved. To reach agreement a protocol may be developed into a technical standard.
Communicating systems use well-defined formats for exchanging messages. Each message has an exact meaning intended to provoke a defined response of the receiver. A protocol therefore describes the syntax, semantics, and synchronization of communication. A programming language describes the same for computations, so there is a close analogy between protocols and programming languages: protocols are to communications what programming languages are to computations.
Read more about Communications Protocol: Communicating Systems, Basic Requirements of Protocols, Protocols and Programming Languages, Universal Protocols, Protocol Design, Protocol Development, Taxonomies, Common Types of Protocols
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... Older forms of message submission using the Telocator Alphanumeric input Protocol protocol involve modem connections directly to a paging network, and are less subject to these delays ... Common paging protocols include TAP, FLEX, ReFLEX, POCSAG, Golay, ERMES and NTT ... Past paging protocols include Two-tone and 5/6-tone ...