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GLOSSARY
A/D
A
nalog to
D
igital 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
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