ESCON

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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 supplanted the older, slower, copper-based Bus & Tag channel technology introduced in 1960-1970 era mainframes. The substantially faster FICON, which runs over Fibre Channel, is in turn supplanting ESCON.

ESCON is also used in HP XP256 disk arrays.

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