May 28, 2008
6871620L01-C
Glossary-4
Glossary
frequency
Number of times a complete electromagnetic-wave cycle occurs in a
fixed unit of time (usually one second).
frequency
generation unit
This unit generates ultra-stable, low-phase noise master clock and other
derived synchronization clocks that are distributed throughout the
communication network.
General-Purpose
Input/Output
Pins whose function is programmable.
GPIO
See General-Purpose Input/Output.
host code
Object code executed by the host processor in an ASTRO subscriber
radio. The host is responsible for control-oriented tasks such as
decoding and responding to user inputs.
IC
IF
Intermediate Frequency.
IMBE
A sub-band, voice-encoding algorithm used in ASTRO digital voice.
inbound signaling
word
Data transmitted on the control channel from a subscriber unit to the
central control unit.
integrated circuit
An 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.
ISW
keep-alive mode
A software-controlled operational mode in which power for the radio
remains on after the On/Off/volume control knob is turned off to allow
the microcontroller unit to complete its power-down sequence. Then,
the radio completely powers off.
key-variable loader
A device used to load encryption keys into a radio.
kHz
kilohertz
One thousand cycles per second. Used especially as a radio-frequency
unit.
KVL
LCD
LED
light emitting diode
An electronic device that lights up when electricity is passed through it.
LiIon
Lithium-ion.
Term
Definition
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
Page 2: ......
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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