532 SAN Multiprotocol Routing: An Introduction and Implementation
Enterprise System Connection (ESCON) 1) An
ESA/390 computer peripheral interface. The I/O
interface uses ESA/390 logical protocols over a
serial interface that configures attached units to a
communication fabric. 2) A set of IBM products and
services that provide a dynamically connected
environment within an enterprise.
entity In general, a real or existing object from the
Latin ens, or being, which makes the distinction
between an object’s existence and its qualities. In
programming, engineering, and probably many
other contexts, the word is used to identify units,
whether concrete items or abstract ideas, that have
no ready name or label.
E_Port Expansion Port. A port on a ...