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Glossary
A/D Analog to Digital converter; converts an instantaneous dc voltage level to a corresponding
digital value.
ABACUS IC Custom integrated circuit providing a digital receiver IF backend.
ADSIC ABACUS/DSP Support IC; custom integrated circuit providing peripheral functions for the
DSP.
ALC Automatic Level Control; a circuit in the transmit RF path that controls RF power amplifier
output, provides leveling over frequency and voltage, and protects against high VSWR.
D/A Digital to Analog converter; converts a digital value to a corresponding dc voltage value.
DTMF Dual Tone Multi-Frequency
DPL Digital Private-Line™
DSP Digital Signal Processor; microcontroller specifically tailored for signal processing
computations. In this case refers specifically to Motorola DSP56001.
Firmware Software or a software/hardware combination of computer programs and data, with a
fixed logic configuration stored in a read-only memory; information can not be altered or
reprogrammed.
FGU Frequency Generation Unit
FLASHport™ A Motorola term that describes the ability of a radio to change memory. Every FLASHport
radio contains a FLASHport EEPROM memory chip that can be software written and
rewritten to, again and again.
Host Motorola HC11F1 microcontrol unit U204 (see MCU).
Host Port Parallel memory mapped interface consisting of eight registers in the DSP56001.
IC Integrated Circuit
IMBE A sub-band, voice encoding algorithm used in ASTRO digital voice.
ISW Inbound Signalling Word; data transmitted on the control channel from a subscriber unit
to the central control unit.
LSH Low Speed Handshake; 150 baud digital data sent to the radio during trunked operation
while receiving audio.
MCU MicroControl Unit
MDC Motorola Digital Communications
OMPAC Over-Molded Pad-Array Carrier; a Motorola custom IC package, distinguished by the
presence of solder balls on the bottom pads.
Open Architecture A controller configuration that utilizes a microprocessor with extended ROM, RAM, and
EEPROM.
OSW Outbound Signalling Word; data transmitted on the control channel from the central
controller to the subscriber unit.
PC Board Printed Circuit board
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.
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