May 28, 2008
6871620L01-C
Glossary-8
Glossary
Serial Peripheral
Interface
How the microcontroller communicates to modules and ICs through the
CLOCK and DATA lines.
signal
An electrically transmitted electromagnetic wave.
Signal Qualifier
mode
An operating mode in which the radio is muted, but still continues to
analyze receive data to determine RX signal type.
SIO IC
Smart Radio
Interface Box
A service aid containing microcontroller buffered RAM that enhances
the speed and capability of programming a radio with programming
software.
softpot
software
Computer programs, procedures, rules, documentation, and data
pertaining to the operation of a system.
software
potentiometer
A computer-adjustable electronic attenuator.
spectrum
Frequency range within which radiation has specific characteristics.
SPI
See Serial Peripheral Interface.
squelch
Muting of audio circuits when received signal levels fall below a pre-
determined value. With carrier squelch, all channel activity that exceeds
the radio’s preset squelch level can be heard.
SRAM
SRIB
See Smart Radio Interface Box.
SSI
See Synchronous Serial Interface.
Standby mode
An operating mode in which the radio is muted but still continues to
monitor data.
static RAM
A type of memory used for volatile, program/data memory that does not
need to be refreshed.
Synchronous Serial
Interface
DSP interface to peripherals that consists of a clock signal line, a frame
synchronization signal line, and a data line.
system central
controllers
Main control unit of the trunked dispatch system; handles ISW and
OSW messages to and from subscriber units
.
system select
The act of selecting the desired operating system with the system-select
switch (also, the name given to this switch).
talkaround
A conventional radio feature that lets you bypass the repeater and
connect directly to another radio. The transmit and receive frequencies
are the same.
Term
Definition
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
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Page 16: ...May 28 2008 6871620L01 C xiv Commercial Warranty Notes ...
Page 22: ...May 28 2008 6871620L01 C 1 6 Introduction Notes ...
Page 26: ...May 28 2008 6871620L01 C 2 4 Radio Power Notes ...
Page 56: ...May 28 2008 6871620L01 C 3 30 Theory of Operation Notes ...
Page 100: ...May 28 2008 6871620L01 C 6 8 Troubleshooting Waveforms Notes ...
Page 194: ...May 28 2008 6871620L01 C B 2 Motorola Service Centers Notes ...
Page 204: ...May 28 2008 6871620L01 C Glossary 10 Glossary Notes ...
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