Glossary-4 Glossary
Global Control
Audio and Power IC
A mixed-signal (analog and digital) integrated circuit that provides
control, audio, and voltage regulation functionality for the Controller
board.
GPIO See General-Purpose Input/Output.
host code Object code executed by the host processor in an ASTRO subscriber
radio. The host is responsible for control-oriented tasks such as
decoding and responding to user inputs.
IC See integrated circuit.
IF Intermediate Frequency.
IMBE A sub-band, voice-encoding algorithm used in ASTRO digital voice.
inbound signaling
word
Data transmitted on the control channel from a subscriber unit to the
central control unit.
integrated circuit An assembly of interconnected components on a small semiconductor
chip, usually made of silicon. One chip can contain millions of
microscopic components and perform many functions.
ISW See inbound signaling word.
key-variable loader A device used to load encryption keys into a radio.
kHz See kilohertz.
kilohertz One thousand cycles per second. Used especially as a radio-frequency
unit.
KVL See key-variable loader.
LCD See liquid-crystal display.
LED See light emitting diode.
light emitting diode An electronic device that lights up when electricity is passed through it.
liquid-crystal display An LCD uses two sheets of polarizing material with a liquid-crystal
solution between them. An electric current passed through the liquid
causes the crystals to align so that light cannot pass through them.
LO Local oscillator.
low-speed
handshake
150-baud digital data sent to the radio during trunked operation while
receiving audio.
LSH See low-speed handshake.
Master In Slave Out SPI data line from a peripheral to the MCU.
Master Out Slave In SPI data line from the MCU to a peripheral.
Term Definition
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