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The ITU-T developed a series of data networking
standards, designated by the prefix “X”, some of which have become extremely
popular. The X.25 standard, for example, and its High-level Data Link Control
(HDLC) data link layer, were so widespread that they have served as the basis
for many of the other technologies described in this Guide. A more recent
example is the International version of the Frame Relay Standards.
Frame relay is a widely used, mature packet
technology used mainly for wide-area network (WAN) services. Frame relay
provides connection-oriented, data link layer communication with the addition
of packet relaying, based on the assumption of low noise links and high-speed
processors. The Frame Relay Forum is an association that promotes the
development and use of this technology. Frame relay was developed as a part of
the Integrated Services Digital Network (ISDN) framework, and is specified in
many X-series ITU-T standards. Parts are also specified in ITU I.122 and Q.922.
Keywords:
Packet-switched networking, data link layer.
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