Digital Data Communications Message Protocol

Digital Data Communications Message Protocol ( DDCMP ) is a network protocol that was developed by Digital Equipment Corporation in 1974 in order to enable communication via point-to -point links for DECnet Phase I network protocol.

The Digital Data Communications Message Protocol, or shortly DDCMP, is an older, character-oriented protocol. It is still important, but increasingly more powerful, bit-oriented protocols such as HDLC (High- Level Data Link Control ) and SDLC ( Synchronous Data Link Control) replaced.

DDCMP can be used on synchronous and asynchronous lines, in the half-and full -duplex operation, as well as in point- to-point and multipoint connections.

It uses three classes of blocks of information, maintenance and monitoring. The error checking is done separately for the head and payload data. The protocol is byte -count orientet, which means that in my head the byte length is explicitly specified.

The protocol is part of the data link layer and is therefore part of the OSI layer model.