A protocol suite developed by Digital Equipment Corporation (DEC). DECnet was originally designed in 1975 to allow PDP-11 minicomputers to communicate with each other.
DECnet conforms to the Digital Network Architecture (DNA) developed by DEC, which maps to the seven-layer Open Systems Interconnection (OSI) reference model for networking protocols. DECnet is essentially a peer-to-peer networking protocol for all DEC networking environments. DECnet supports various media and link-layer technologies, including Ethernet, Token Ring, and Fiber Distributed Data Interface (FDDI). The current release of DECnet is called Phase V.
Graphic D-12. DECnet.