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Glossary
GL-6
Cisco IPICS Server Installation Guide
OL-8155-01
F
FDM
frequency-division multiplexing. Technique whereby information from multiple
channels can be allocated bandwidth on a single wire based on frequency.
FDMA
frequency-division multiple access. A a channel access method in which
different conversations are separated onto different frequencies. FDMA is
employed in narrowest bandwidth and multiple-licensed channel operations.
FLEXlm
Cisco software that enforces licensing on certain systems; FLEXlm ensures that
Cisco IPICS software will work only on the supported and licensed hardware.
floor control
The standard mechanism for Push-to-Talk speaker arbitration.
frame
A logical grouping of information sent as a data link layer unit over a
transmission medium. Often refers to the header and the trailer, used for
synchronization and error control, that surround the user data contained in the
unit. The terms cell, datagram, message, packet, and segment also describe
logical information groupings at various layers of the OSI reference model.
frequency
For a periodic function, frequency represents the number of cycles or events per
unit of time.
frequency
assignment
Assignment that is given to a radio station to use a radio frequency or radio
frequency channel under specified conditions.
frequency hopping
The repeated switching of frequencies during radio transmission according to a
specified algorithm, intended to minimize unauthorized interception or jamming
of telecommunications.
frequency
modulation
Modulation technique in which signals of different frequencies represent
different data values.
frequency sharing
The assignment to or use of the same radio frequency by two or more stations
that are separated geographically or that use the frequency at different times.