ESCON (or Enterprise Systems Connection) is an optical
serial interface between
IBM mainframe computers and peripheral devices such as
storage and tape drives. ESCON is capable of
half-duplex communication at a rate of 17 MB/second over distances of up to 43 kilometers. ESCON was introduced by IBM in 1990 to replace the older, slower, copper-based Bus & Tag channel technology of 1960-1990 era mainframes. The substantially faster
FICON channel, which runs over
Fibre Channel, is in turn supplanting ESCON.
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ENTERPRISE SYSTEM CONNECTION (ARCHITECTURE) [IBM]. ESCON
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