Asynchronous transfer mode (ATM) is a network standard that was developed with many goals, one of which was the integration of voice and data networks. At the time of its development, voice networks were for the telecommunications industry while data networks were for the computer industry and community. When IP became the dominant data network, ATM was used to provide connection-oriented packet transport of IP traffic. Today it has largely been replaced by multiprotocol label switching (MPLS), though it is in many legacy systems. It implements many ideas of modern packet switching, some of which are described in this appendix.
An ATM network uses packets or cells with a fixed size of 53 bytes; this packet ...
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