Packet switching is a communications
paradigm in which
packets (discrete blocks of data) are
routed between
nodes over data links shared with other traffic. In each network node, packets are queued or buffered, resulting in variable delay. This contrasts with the other principal paradigm,
circuit switching, which sets up limited number of constant bit rate and constant delay connections between the nodes for their exclusive use for the duration of the communication.
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<
communications> A communications paradigm in which
packets (messages or fragments of messages) are individually
routed between
nodes, with no previously established communication path. Packets are routed to their destination through the most expedient route (as determined by some routing
algorithm). Not all packets travelling between the same two hosts, even those from a single message, will necessarily follow the same route.
The destination computer reassembles the packets into their appropriate sequence. Packet switching is used to optimise the use of the
bandwidth available in a network and to minimise the
latency.
X.25 is an international standard packet switching network.
Also called
connectionless. Opposite of
circuit switched or
connection-oriented. See also
virtual circuit,
wormhole routing.
(1999-03-30)
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