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X series Data Network

URL:      http://

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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