FAC
Certified frequency advisory committee, also known as a
frequency coordinator.
Fault-tolerant
A method of making a network system or a computer resistant
to software errors, hardware problems or power failures.
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FCC
Federal Communications Commission. The federal agency responsible
for commercial and private spectrum management.
FDDI
Fiber Distributed Data Interface. ANSI standard for token passing
netowrks use optical fiber and operates at 100 Mbps
FEC
forward error correction. Method of error control where the receiving
node automatically corrects as many channel errors as it can whiteout
referring to the sending node.
Feature Group D
Local exchange carrier network service that, among other things,
lets public-safety dispatch offices receive a 10-digit data stream,
including the full call-back number, alongside wireless 911 calls.
Offered as a way by which wireless carriers can meet FCC enhanced
911 rules and dispatch offices can overcome their current bandwidth
limits.
FHMA
frequency hopping multiple access A digital technology used in Geotek
Communications Inc.'s specialized mobile radio network.
FHSS
Frequency hopping spread spectrum. Takes the data signal and modulates
it with a carrier signal that hops from frequency to frequency as
a function of time over a wide band of frequencies.
Firewall
Device that interfaces the network to the outside world and shields
the inside from unauthorized users. Usually by blocking certain
types of traffic.
FLEX
A Motorola Inc.-licensed protocol that gives carriers more capacity
on their networks and faster transmission times. Also refers to
the FLEX family of protocols.
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Flash memory
A component used for memory that can retain information without
power.
FNPRM
further notice of proposed rulemaking
A document issued by the FCC to spur additional comment on a future
commission action.
Foliage attenuation
Reductions in signal strength or quality due to signal absorption
by trees or foliage obstructions in the signal's line-of-sight path.
For example, 800 MHz systems are seldom deployed in forested areas.
Pine needles-nearly the same length as 800 MHz antennas-can negatively
affect signal reception in that band.
Forward looking
An action that ignores the past, particularly previous investment.
Often used regarding FCC efforts to set interconnection terms; its
forward-looking price-setting method ignored phone companies' historic
network costs and was struck down by a federal appeals court.
Fractional T1 frame
A 64 Kbps increment of a T1 frame
Frame Relay
Packet switching interface
Wideband, packet-based interface used to transmit bursts of data
over a wide-area network. Seldom used for voice. Similar to X.25
minus the transmission error control overhead.
Frequency reuse
The ability of specific channels assigned to a single cell to be
used again in another cell, when there is enough distance between
the two cells to prevent co-channel interference from affecting
service quality. The technique enables a cellular system to increase
capacity with a limited number of channels.
FRS
Family Radio Service
A very low power, short range two-way radio service in the 460 MHz
band.
Fully
connected topology
Topology where every node is directly connected to every other node
in the network
FWA
fixed wireless access
Also known as wireless local loop.
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