February 14, 2012 6816985H01-F
Glossary-2 Glossary
Host Code Object code executed by the Host Processor in an ASTRO subscriber
radio. The Host is responsible for control-oriented tasks such as decod-
ing and responding to user inputs.
Host Port Parallel memory mapped interface consisting of eight registers in the
DSP.
IC 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.
IMBE A sub-band, voice encoding algorithm used in ASTRO digital voice.
ISW Inbound Signaling Word; data transmitted on the control channel from a
subscriber unit to the central control unit.
KRSIC Digital Signal Processor Support IC; custom integrated circuit providing
peripheral functions for the DSP.
LSH Low Speed Handshake; 150 baud digital data sent to the radio during
trunked operation while receiving audio.
MAKO Power Management Integrated Circuit.
MCU Micro Controller Unit. Also written as µC. A microprocessor that
contains RAM and ROM components, as well as communications and
programming peripherals.
Open Architecture A controller configuration that utilizes a microprocessor with extended
ROM, RAM, and EEPROM.
OSW Outbound Signaling Word; data transmitted on the control channel from
the central controller to the subscriber unit.
PC Board Printed Circuit board.
PCIC Power Control Integrated Circuit. The power control IC is intended for
closed-loop bias control of power amplifiers. The device facilitates
accurate control of the current delivered to the power amplifier (PA) via
a control voltage.
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 microcontroller unit or
programmable logic IC.
Term Definition
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