networking (OSI-RM, OSI Reference Model, seven layer model)
A model of network architecture and a suite of
protocols (a
as a framework for international
standards in heterogeneous
The OSI architecture is split between seven
layers, from
Each layer uses the layer immediately below it and provides a
service to the layer above. In some implementations a layer
may itself be composed of sub-layers.
OSI is the umbrella name for a series of non-proprietary
protocols and specifications, comprising, among others, the
Information Protocol and Services),
X.400 (Message Handling
System, or MHS),
X.500 (Directory Service),
Z39.50 (search
and retrieval protocol used by
WAIS), and many others.
Apart from its actual application to real protocols, it also
serves as a useful teaching model.
(2002-05-19)