Technical data

GL–6 Glossary
failover The process that takes place when one controller in a dual-redundant
configuration assumes the workload of a failed companion controller.
Failover continues until the failed controller is repaired or replaced.
FCC Federal Communications Commission. The federal agency responsible for
establishing standards and approving electronic devices within the United
States.
FCC Class A This certification label appears on electronic devices that can only be used
in a commercial environment within the United States.
FCC Class B This certification label appears on electronic devices that can be used in
either a home or a commercial environment within the United States.
FDDI Fiber Distributed Data Interface. An ANSI standard for 100 megabaud
transmission over fiber optic cable.
FD SCSI The fast, narrow, differential SCSI bus with an 8-bit data transfer rate of 10
MB/s. See also FWD SCSI and SCSI.
fiber A fiber or optical strand. Spelled fibre in Fibre Channel.
fiber optic cable A transmission medium designed to transmit digital signals in the form of
pulses of light. Fiber optic cable is noted for its properties of electrical
isolation and resistance to electrostatic contamination.
flush The act of writing dirty data from cache to a storage media.
FMU Fault management utility.
forced errors A data bit indicating a corresponding logical data block contains
unrecoverable data.
frame An invisible unit used to transfer information in Fibre Channel.
FRU Field replaceable unit. A hardware component that can be replaced at the
customer’s location by DIGITAL service personnel or qualified customer
service personnel.