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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)
EOT
End of tape.
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.
ESD
Electrostatic Discharge.
F
fault symptom code (FSC)
A four-character hexadecimal code generated in response to an error to help isolate
failures within the device. Some FSCs are for information purposes only.
FC
See Fibre Channel.
fiber optics
The branch of optical technology concerned with the transmission of radiant power
through fibers made of transparent materials such as glass, fused silica, and plastic.
(E)
fiber-optic cable
A cable made of ultrathin glass or silica fibers which can transmit data using pulses
of laser light. Fiber-optic cables have several advantages over copper cables: they
have much less signal loss; they allow information to be transmitted at higher speeds
and over longer distances; they are not affected by external electrical noise; and they
are better for transmissions which require security.
Fibre Channel
The National Committee for Information Technology Standards standard that defines
an ultrahigh-speed, content-independent, multilevel data transmission interface that
supports multiple protocols simultaneously. Fibre Channel supports 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.
fibre connection (FICON)
An ESA/390 and zSeries computer peripheral interface. The I/O interface uses ESA/
390 and zSeries FICON protocols (FC-FS and FC-SB-2) over a Fibre Channel serial
interface that configures units attached to a FICON-supported Fibre Channel
communications fabric.
104 T9840 URM
December 2012
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