Fade
- A drop in the received signal strength as a result of the RF transmission's
interactions with the transmission environment. FCC - Federal Communications
Commission. The government agency responsible for regulating telecommunications
in the United States, located in Washington, D.C. Their responsibilities for
public radio communications, such as cellular, include allocation of frequencies,
the development of regulations that govern their use and monitoring to ensure
that regulations are followed. FDMA
- Frequency Division Multiple Access. FEC - Forward Error
Correction (coding / decoding technique). FER - Frame Error
Rate. FH - Frequency
Hopping. FHMA - Frequency
Hopping Multiple Access. Flash- Hook - 400ms
of signaling tone sent on the reverse voice channel (by the mobile) to request
a hook flash. FM - Frequency
Moduation; modulation of the RF carrier frequency. Follow-Me Roaming
- The ability for the cellular system to automatically forward calls to a
roaming mobile that has left it's primary service area. Without this feature,
the calling party must know the location of the roamer and place a call to
that areas MTSO first (calling a 'port'), then calling the mobile. Forced Disconnect
- A call processing function that forces termination of a call, usually not
at the mobile subscriber's request. Forward Control Channel
(FOCC) - A Control Channel used from the base station-to-subscriber direction,
also known as the control channel downlink. Forward Voice Channel
(FVC) - A voice channel used in the base station-to-subscriber direction,
also known as the voice channel downlink. Four-Wire Line
- A two-way transmission circuit using two pairs of conductors, to allow full
duplex (simultaneous) conversation without multiplexing. Free space loss
- This is simply the power loss of the signal as a result of the signal spreading
out as it travels through space. As a wave travels, it spreads out its power
over space, I.E. as the wave front spreads, so does its power. Frequency hopping
- The transmitter hops to one of many channels, The receiver knows the sequence
of the frequency hopper and follows each hop. Frequency Reuse
- The ability to use the same frequencies repeatedly within a single system,
made possible by the basic design approach for cellular. Since each cell is
designed to use radio frequencies only within its boundaries, the same frequencies
can be reused in other cells not far away with little potential for interference.
The reuse of frequencies is what allows a cellular system to handle a huge
number of calls with a limited number of channels. Frequency Shift Keying
(FSK) - The form of frequency modulation that used two separate audio
frequencies to transmit binary ones and zeros. Front-End - The
first stage of filtering in a receiver. The first circuit stage following
the antenna input to the receiver. FSK - Frequency
Shift Keying; a digital binary modulation of the RF carrier frequency. Full Duplex - Refers
to a communications system that uses two separate transmit and receive paths
to allow simultaneous conversation in two directions.
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