November 16, 2006
6881094C31-E
Glossary-8
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.
thin small-outline
package
A type of dynamic random-access memory (DRAM) package that is
commonly used in memory applications.
Term
Definition
Summary of Contents for ASTRO XTS-5000
Page 7: ...vi Table of Contents November 16 2006 6881094C31 E Notes ...
Page 11: ...x List of Figures November 16 2006 6881094C31 E Notes ...
Page 17: ...November 16 2006 6881094C31 E xvi CommercialWarranty Notes ...
Page 31: ...November 16 2006 6881094C31 E xxx Portable Radio Model Numbering System Notes ...
Page 83: ...November 16 2006 6881094C31 E 3 44 Theory of Operation Encryption Module ...
Page 135: ...November 16 2006 6881094C31 E 5 44 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 175: ...November 16 2006 6881094C31 E 7 32 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 367: ...November 16 2006 6881094C31 E Glossary 10 Notes ...
Page 373: ...Index 6 November 16 2006 6881094C31 E Notes ...