StorageTek L700 Service Manual page 344

Glossary
Channel node establishes a logical
connection to a fabric switch.
fault symptom code (FSC) A four-
character hexadecimal code generated in
response to an error to help isolate failures
within the device.
fiber Any filament made of dielectric
material that guides light, regardless of its
ability to send signals.
fiber-optic cable (1) A jacketed cable of
thin strands of glass that carries pulses of
light that transmit data for high-speed
transmissions over medium to long distances.
The cable can be single mode, which carries
a single signal from a laser or light-emitting
diode light source, or multimode, which
carries multiple signals from either light
source. (2) A technology that uses glass (or
plastic) threads (fibers) to transmit data. A
fiber optic cable consists of a bundle of glass
threads, each of which is capable of
transmitting messages modulated onto light
waves. Fiber-optic cables have several
advantages over traditional metal cables, such
as: greater bandwidth, less susceptible to
interference, thinner and lighter than metal
cables, and they can transmit data digitally
rather than analogically. (3) A jacketed cable
of thin strands of glass that carries pulses of
light; these pulses transmit data for high-
speed transmissions over medium to long
distances. The cable can be single mode,
which carries a single signal from a laser or
light-emitting diode light source, or
multimode, which carries multiple signals
from either light source.
Fibre Channel (FC) (1) The National
Committee for Information Technology
Standards standard that defines an ultra high-
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
Glossary-4
topologies. (2) The standard from the
National Committee for Information
Technology Standards that defines an ultra
high-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 Channel Arbitrated Loop (FC_AL)
(1) An arrangement of Fibre Channel stations
such that messages pass from one to the next
in a ring. (2) One of three Fibre Channel
topologies where 2 to 126 devices
interconnect serially in a single-loop circuit.
Fibre Channel protocol The mapping of
SCSI-3 commands over a Fibre Channel
interface.
firmware An ordered set of instructions and
data stored in a way that is functionally
independent of main storage; for example,
microprograms stored in a ROM. (T) See also
microcode. (2) See microcode.
field replaceable unit (FRU) An assembly
that is replaced in its entirety when any one
of its components fails. (IBM)
G
Gateway A 32-bit, or 4-byte number, in
doted decimal format (typically written as
four numbers separated by periods, such as
107.4.1.3 or 84.2.1.111) that is applied to an
IP Address to identify router interface.
H
hand-camera assembly (1) A part of the
library robot whose function is grasping
cartridge tapes and moving them between
storage cells and tape drives. The camera
reads cartridge volume serial numbers during
library audits and normal operation. (2) A
Fourteenth Edition
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