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enterprise A representation of the goals,
organizational structure, business processes,
and information resources and requirements
of an enterprise. (IBM)
Enterprise Systems Connection
(ESCON) A set of IBM products and services
that provide a dynamically- connected
environment within an enterprise. (IBM)
environmental requirement Any of the
physical conditions required for the
protection and proper operation of a
functional unit; the requirement is usually
specified as a nominal value and a tolerance
range. For a device, there may be more than
one set of environmental requirements; for
example, one set for transport, another for
storage, and another for operation. (T) (A)
error A discrepancy between a computed,
observed, or measured value or condition
and the true, specified, or theoretically
correct value or condition. (I) (A)
ESCON See Enterprise Systems Connection.
ESCON channel A channel having an
Enterprise Systems Connection channel-to-
control-unit I/O interface that uses optical
cables as a transmission medium.
F
fault symptom code (FSC) A hexadecimal
code generated by the drive for controller
microcode in response to a detected
subsystem error.
fibre channel (FC) The ANSI standard that
defines an ultra high-speed, content
independent, multi-level data transmission
interface that can support multiple protocols
simultaneously, support connectivity to
millions of devices over copper and/or fiber
optic physical media, and provides the best
characteristics of both networks and
channels, over diverse topologies.
fiber optics The branch of optical
technology concerned with the transmission
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of radiant power through fibers made of
transparent materials such as glass, fused
silica, and plastic. (E)
field replaceable unit (FRU) An assembly
that is replaced in its entirety when any one
of its components fails. (IBM)
file-protect To prevent the destruction or
overwriting of data stored on cartridge tape.
See also write-protect switch.
firmware An ordered set of instructions and
data stored in a way that is functionally
independent of main storage; for example,
microprograms stored in ROM. (T)
fixed Synonym for resident.
format In programming languages, a
language construct that specifies the
representation, in character form, of data
objects in a file. (I)
frame A hardware device in which drives
are installed.
FRU See field replaceable unit.
FSC See fault symptom code.
H
hardware All or part of the physical
components of an information processing
system, such as computers or peripheral
devices. (T) (A)
host The primary computer on a network,
with which other computers interact.
host interface An interface between a
network and host computer. (T)
HP/UX A form of UNIX designed to run on
Hewlett Packard and other workstations.
I
indicator A device that gives a visual or
other indication of the existence of a defined
state. (T)
Ninth Edition
Glossary
Glossary-3
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