| Cell Relay |
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Cell relay Transmission Rate s usually are between 56 kbit/s and several gigabits per second. ATM, a particularly popular form of cell relay, is most commonly used for home DSL connections, which often runs between 128 kbit/s and 1.544 Mbit/s ( DS1 ), and for high-speed backbone connections ( OC-3 and faster). Cell relay protocols (a) have neither Flow Control nor Error Correction capability, (b) are information-content independent, and (c) correspond only to layers one and two of the OSI Reference Model . Cell relay systems enclose variable-length user packets in fixed-length packets, i.e. cells, that add addressing and verification information. Frame length is fixed in Hardware , based on time delay and user packet-length considerations. One user data message may be segmented over many cells. Cell relay is an implementation of Fast Packet-switching technology that is used in (a) connection-oriented broadband integrated services digital networks ( B-ISDN , and its better-known supporting technology ATM ); and (b) connectionless IEEE 802.6 switched multi-megabit data service ( SMDS ). Cell relay is used for time-sensitive traffic such as voice and video. Source: Federal Standard 1037C |