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bisync

(BInary SYNChronous) A major category of synchronous communications protocols used in mainframe networks. Bisync communications require that both sending and receiving devices are synchronized before transmission of data is started. In the IBM world, bisync was superseded by SDLC. Contrast with asynchronous transmission. See SDLC.



SDLC

(1) See system development life cycle.

(2) (Synchronous Data Link Control) The primary data link protocol used in IBM's SNA networks. It is a bit-oriented synchronous protocol that is a subset of the HDLC protocol. See SNA, DLC and Microsoft DLC.



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bistablebit density
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