Download Implementing an Open IBM SAN - ps

terminates both jumper cable fibers in one
housing and provides physical keying for
attachment to a duplex receptacle.
duplex receptacle. In an ESCON
environment, a fixed or stationary optical fiber
component that provides a keyed attachment
method for a duplex connector.
dynamic connection. In an ESCON Director,
a connection between two ports, established
or removed by the ESCD and that, when
active, appears as one continuous link. The
duration of the connection depends on the
protocol defined for the frames transmitted
through the ports and on the state of the ports.
Contrast with dedicated connection.
dynamic connectivity. In an ESCON
Director, the capability that allows connections
to be established and removed at any time.
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.
Enterprise Systems Architecture/390
(ESA/390). An IBM architecture for mainframe
computers and peripherals. Processors that
follow this architecture include the S/390
Server family of processors.
Entity In general, a real or existing thing from
the Latin ens, or being, which makes the
distinction between a thing's existence and it
qualities. In programming, engineering and
probably many other contexts, the word is
used to identify units, whether concrete things
or abstract ideas, that have no ready name or
label.
Dynamic I/O Reconfiguration. A S/390 and
z/Architecture function that allows I/O
configuration changes to be made
non-disruptively to the current operating I/O
configuration.
ESA/390. See Enterprise Systems
Architecture/390.
ECL Emitter Coupled Logic - The type of
transmitter used to drive copper media such
as Twinax, Shielded Twisted Pair, or Coax.
ESCD console. The ESCON Director display
and keyboard device used to perform operator
and service tasks at the ESCD.
ELS. See Extended Link Services.
ESCON. See Enterprise System Connection.
EMIF. See ESCON Multiple Image Facility.
ESCON channel. A channel having an
Enterprise Systems Connection
channel-to-control-unit I/O interface that uses
optical cables as a transmission medium. May
operate in CBY, CNC, CTC or CVC mode.
Contrast with parallel channel.
E_Port Expansion Port - a port on a switch
used to link multiple switches together into a
Fibre Channel switch fabric.
Enterprise Network A geographically
dispersed network under the auspices of one
organization.
Enterprise System Connection (ESCON).
(1) An ESA/390 computer peripheral interface.
622
Implementing an Open IBM SAN
ESCD. Enterprise Systems Connection
(ESCON) Director.
ESCON Director. An I/O interface switch that
provides the interconnection capability of
multiple ESCON interfaces (or FICON Bridge
(FCV) mode - 9032-5) in a distributed-star
topology.