Motorola Astro Digital Spectra Digital Spectra Plus Basic 6881076c20 E Manual

GlossaryGlossary
This glossary contains an alphabetical listing of terms and their definitions that are applicable to 
ASTRO portable and mobile subscriber radio products.
Te r mDefinition
A/DSee analog-to-digital conversion.
Abacus ICA custom integrated circuit providing a digital receiver intermediate 
frequency (IF) backend.
ADCSee analog-to-digital converter.
ADDAGSee Analog-to-Digital, Digital-to-Analog and Glue.
ALCSee automatic level control.
analogRefers to a continuously variable signal or a...

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CPSSee Customer Programming Software.
Customer 
Programming 
SoftwareSoftware with a graphical user interface containing the feature set of an 
ASTRO radio. See also RSS.
D/ASee digital-to-analog conversion.
DACSee digital-to-analog converter.
defaultA pre-defined set of parameters.
digitalRefers to data that is stored or transmitted as a sequence of discrete 
symbols from a finite set; most commonly this means binary data 
represented using electronic or...

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Electrically Erasable 
Programmable 
Read-Only MemoryA special type of PROM that can be erased by exposing it to an 
electrical charge. An EEPROM retains its contents even when the 
power is turned off.
FCCFederal Communications Commission.
firmwareCode executed by an embedded processor such as the Host or DSP in 
a subscriber radio. This type of code is typically resident in non-volatile 
memory and as such is more difficult to change than code executed 
from...

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inbound signaling 
wordData transmitted on the control channel from a subscriber unit to the 
central control unit.
integrated circuitAn 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.
ISWSee inbound signaling word.
key-variable loaderA device used to load encryption keys into a radio.
kHzSee kilohertz.
kilohertzOne thousand cycles per...

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MOSISee Master Out Slave In.
multiplexerAn electronic device that combines several signals for transmission on 
some shared medium (e.g., a telephone wire).
MUXSee multiplexer.
NiCdNickel-cadmium.
NiMHNickel-metal-hydride.
OMPACSee over-molded pad-array carrier.
open architectureA controller configuration that utilizes a microprocessor with extended 
ROM, RAM, and EEPROM.
oscillatorAn electronic device that produces alternating electric current and 
commonly...

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PTTSee Push-to-Talk.
Push-to-TalkThe switch or button usually located on the left side of the radio which, 
when pressed, causes the radio to transmit. When the PTT is released, 
the unit returns to receive operation.
radio frequencyThe portion of the electromagnetic spectrum between audio sound and 
infrared light (approximately 10 kHz to 10 GHz).
radio frequency 
power amplifierAmplifier having one or more active devices to amplify radio signals.
Radio Interface...

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RPCICRegulator/power control IC.
RPT/TASee repeater/talkaround.
RSSSee Radio Service Software.
RTCSee real-time clock.
RXReceive.
RX DATARecovered digital data line.
SAPSee Serial Audio CODEC Port.
SCI INSerial Communications Interface Input line.
Serial Audio CODEC 
PortSSI to and from the GCAP II IC CODEC used to transfer transmit and 
receive audio data.
Serial 
Communication 
Interface Input LineA full-duplex (receiver/transmitter) asynchronous serial...

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Standby modeAn operating mode in which the radio is muted but still continues to 
monitor data.
static RAMA type of memory used for volatile, program/data memory that does not 
need to be refreshed.
Synchronous Serial 
InterfaceDSP interface to peripherals that consists of a clock signal line, a frame 
synchronization signal line, and a data line.
system central 
controllersMain control unit of the trunked dispatch system; handles ISW and 
OSW messages to and from...

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vocoderAn electronic device for synthesizing speech by implementing a 
compression algorithm particular to voice. See also voice encoder.
vocoder/controllerA PC board that contains an ASTRO radio’s microcontroller, DSP, 
memory, audio and power functions, and interface support circuitry.
voice encoderThe DSP-based system for digitally processing analog signals, and 
includes the capabilities of performing voice compression algorithms or 
voice encoding. See also...

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Notes
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