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5
Additional Information
Glossary
ACK Acknowledgment of communication
Channel A group of characteristics such as transmit/receive
frequency pairs, radio parameters, and encryption
encoding
Control Channel In a trunking system, one of the channels that is used
to provide a continuous, two-way/data
communications path between the central controller
and all radios on the system
Conventional Typically refers to radio-to-radio communications,
sometimes through a repeater; does not use a
trunking (controller) system (See Trunking)
Dispatcher An individual who has radio system management
duties
FCC Federal Communications Commission
Hang Up Disconnect
Landline Caller Someone communicating through the public
telephone system
Page A one-way alert, with audio and/or display messages
PTT Push-To-Talk - the PTT switch engages the transmitter
and puts the radio in transmit (send) operation when
pressed
Radio-To-Landline Communicating from a portable/mobile radio
through the telephone system
Repeater A conventional radio feature, where you talk through
a receive/transmit facility (repeater), that re-transmits
received signals in order to improve communications
range and coverage
RF Radio Frequency
Squelch The muting of audio circuits when received signal
levels fall below a pre-determined threshold
Standby An operating condition whereby the radio’s speaker is
muted but still continues to receive data
Talkgroup An organization of radio users who communicate
with each other
Trunking The automatic sharing of communications paths
between a large number of users (See Conventional)
Zone A grouping of channels
Model I Book Page 33 Wednesday, August 14, 1996 8:51 AM
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