and confidentiality protection of a packet. ESP also supports encryption-only and
authentication-only configurations, but encryption without authentication is discouraged because
it is insecure.
F
fault symptom code (FSC)
A hexadecimal code that is generated by the drive or the control unit microcode in response to a
detected subsystem error.
FC Feature code.
FCC Federal communications commission.
FE Field engineer, customer engineer, or service representative.
FH Full height.
Fibre Channel
A high-speed method to connect data storage to a server. The British spelling of "Fibre" is used
because the technology can be used with either fiber optic or copper cables. Thus, the name does
not imply that it can only be used with a fiber optic cable.
fiducial
A target that is used for teaching a physical location to a robot.
field replaceable unit (FRU)
An assembly that is replaced in its entirety when any one of its components fails.
file A named set of records that are stored or processed as a unit. Also referred to as a data set.
file protection
The processes and procedures that are established in an information system that are designed to
inhibit unauthorized access to, contamination of, or deletion of a file.
file transfer protocol (FTP)
In the Internet suite of protocols, an application layer protocol that uses TCP and Telnet services
to transfer bulk-data files between machines or hosts.
firmware
Proprietary code that is delivered as microcode as part of an operating system. Firmware is more
efficient than software loaded from an alterable medium and more adaptable to change than pure
hardware circuitry. An example of firmware is the Basic input/output system (BIOS) in read-only
memory (ROM) on a PC system board.
FLASH EEPROM
An electrically erasable programmable read-only memory (EEPROM) that can be updated.
FMR Field microcode replacement.
format
The arrangement or layout of data on a data medium.
formatter
Part of a magnetic tape subsystem that performs data conversion, speed matching, encoding, first
level error recovery, and interfaces to one or more tape drives.
FP File protect.
frayed Damaged as if by an abrasive substance.
FRU Field replaceable unit.
FSC Fault symptom code.
FSI Fault symptom index.
Glossary 339
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