Digital Data Communications Message Protocol: Difference between revisions

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{{Short description|Communications protocol}}

'''Digital Data Communications Message Protocol''' ('''DDCMP''') was devised by [[Digital Equipment Corporation]] in [[1974]] to allow communication over point-to-point network links for its [[DECnet|DECnet Phase I]] network protocol. It could use full or half [[duplex]] synchronous and asynchronous links and allowed errors introduced in transmission to be detected and corrected. It was retained and extended for later versions of its DECnet protocol.

{{primary sources|date=October 2011}}

'''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://archive.org/details/datacomputercomm0000hura|url-access=registration|date=28 March 2001|publisher=CRC Press|isbn=978-0-8493-0928-1|page=[https://archive.org/details/datacomputercomm0000hura/page/483 483]|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 suite. The protocol uses full or half [[Duplex (telecommunications)|duplex]] [[synchronous communication|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 suite. DDCMP has been described as the "most popular and pervasive of the commercial byte-count data link protocols".<ref name="Barksdale2013">{{cite book|last=Barksdale|first=William J.|title=Practical Computer Data Communications|url=https://books.google.com/books?id=GTrrBwAAQBAJ&pg=PA185|date=13 March 2013|publisher=Springer Science & Business Media|isbn=978-1-4684-5164-1|page=185|quote=DEC Digital Data Communications Message Protocol (DDCMP)... is the most popular and pervasive of the commercial byte-count data link protocols.}}</ref>

===See References =also==

* [http://telecom.tbi.net/ddcmp.txt DDCMP[DEX (protocol)|DEX]]

== References ==

* [https://web.archive.org/web/20150909234334/http://telecom.tbi.net/ddcmp.htm Overview of the protocol]

* [https://web.archive.org/web/20110716052605/http://telecom.tbi.net/ddcmp.txt Protocol specification] (courtesy of [[Digital Equipment Corporation|DEC]])

;Notes

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[[Category:Network protocols]]