Glossary Glossary-3
Squelch Muting of audio circuits when received signal levels fall below a pre-determined
value
Standby Mode An operating mode whereby the radio is muted but still continues to receive
data
System Central
Controller
Main control unit of the trunked dispatch system; handles ISW and OSW
messages to and from subscriber units (see ISW and OSW).
System Select The act of selecting the desired operating system with the system-select switch
(also, the name given to this switch).
TOT Time-Out Timer: a timer that limits the length of a transmission.
TPL Tone Private-line
µC Microcontroller
UHF Ultra High Frequency
µP Microprocessor
VCO Voltage-Controlled Oscillator: an oscillator whereby the frequency of oscillation
can be varied by changing a control voltage.
VCOBIC Voltage-Controlled Oscillator Buffer Integrated Circuit
VHF Very High Frequency
VSWR Voltage Standing Wave Ratio
Glossary of Terms
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