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'''Digital Data Communications Message Protocol''' ('''DDCMP''') is a [[byte-oriented protocol|byte-oriented]] [[communications protocol]] devised by [[Digital Equipment Corporation]] in 1974<ref name="HuraSinghal2001">{{cite book|author1=Gurdeep S. Hura|author2=Mukesh Singhal|title=Data and Computer Communications: Networking and Internetworking|url=https://books.google.com/books?id=BViV0PoH_voC&pg=PA483|date=28 March 2001|publisher=CRC Press|isbn=978-0-8493-0928-1|page=483|quote=Digital Equipment Corporation (DEC) developed a byte-oriented protocol known as digital data communications message protocol (DDCMP) in 1974.}}</ref> to allow communication over [[Network_topology#Point-to-point|point-to-point]] network links for the company's [[DECnet]] Phase I network protocol. The protocol uses full or half [[Duplex (telecommunications)|duplex]] [[Synchronization|synchronous]] and [[Asynchronous communication|asynchronous]] links and allowed errors introduced in transmission to be detected and corrected. It was retained and extended for later versions of the DECnet protocol.
== References ==
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