Difference between revisions of "Digital Data Communications Message Protocol"
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It was originally designed by [[Digital Equipment Corporation|DEC]] for the [[DECnet]] Phase I network [[protocol suite]], in 1974. It was retained in later versions of DECnet, with modifications and extensions. | It was originally designed by [[Digital Equipment Corporation|DEC]] for the [[DECnet]] Phase I network [[protocol suite]], in 1974. It was retained in later versions of DECnet, with modifications and extensions. | ||
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* [http://decnet.ipv7.net/docs/dundas/aa-d599a-tc.pdf 'DDCMP Specification Version 4.0'], AA-D599A-TC (1 March 1978) | * [http://decnet.ipv7.net/docs/dundas/aa-d599a-tc.pdf 'DDCMP Specification Version 4.0'], AA-D599A-TC (1 March 1978) | ||
| + | * [https://www.geeksforgeeks.org/digital-data-communications-message-protocol-ddcmp/ Digital Data Communications Message Protocol (DDCMP)] - Contains a good, detailed description of failure modes | ||
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Revision as of 10:07, 30 October 2020
The Digital Data Communications Message Protocol (DDCMP) is a byte-oriented data communication protocol for use over full-duplex and half-duplex point-to-point and multi-drop links; principally using using synchronous or asynchronous serial lines, although other communication channels were also supported. It used CRCs to allow transmission errors to be detected; sequence numbers allow detection of completely lost messages. Retransmission is used to correct both.
It was originally designed by DEC for the DECnet Phase I network protocol suite, in 1974. It was retained in later versions of DECnet, with modifications and extensions.
External links
- 'DDCMP Specification Version 4.0', AA-D599A-TC (1 March 1978)
- Digital Data Communications Message Protocol (DDCMP) - Contains a good, detailed description of failure modes
