Glossary
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Open Architecture A controller configuration that utilizes a microprocessor with
extended ROM and RAM.
PC Board Printed Circuit board
PCIC Power Control IC
PL Private-Line
®
tone squelch; a continuous sub-audible tone that is
transmitted along with the carrier.
PLL Phase-Locked Loop; a circuit in which an oscillator is kept in phase
with a reference, usually after passing through a frequency divider.
PTT Push-To-Talk; the switch located on the left side of the radio which,
when pressed, causes the radio to transmit.
Registers Short-term data-storage circuits within the microcontrol unit or
programmable logic IC.
Repeater Remote transmit/receive facility that re-transmits received signals in
order to improve communications coverage.
RESET Reset line; an input to the microcontroller that restarts execution.
RF PA Radio Frequency Power Amplifier
RPT/TA RePeaTer/Talk-Around
RX DATA Recovered digital data line.
Signal Qualifier Mode An operating mode whereby the radio is muted but still continues to
analyze receive data to determine RX signal type.
SCI IN Serial Communication Interface INput line
Softpot Software potentiometer; a computer-adjustable electronic attenuator.
Software Computer programs, procedures, rules, documentation, and data
pertaining to the operation of a system.
SPI Serial Peripheral Interface; how the microcontroller communicates to
modules and ICs through the CLOCK and DATA lines.
Squelch Muting of audio circuits when received signal levels fall below a pre-
determined value.
SRAM Static-RAM chip used for volatile, program/data memory.
SSI Synchronous Serial Interface on the DSP56603 to the CODEC, DSPS
IC, and ADDAG.
Standby Mode An operating mode whereby the radio is muted but still continues to
monitor data.
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.
TSOP Thin Small-Outline Package
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