Motorola SSETM 5000 - Manual (Page 212)

November 11, 2004 6881094C12-A
Glossary-4
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.
ground In an electrical circuit, a common return path that (a) may not
necessarily be connected to earth and (b) is the zero-voltage reference
level for the equipment or system.
ground plane An electrically conductive surface that serves as the near-field reflection
point for an antenna.
host code Object code executed by the host processor in a subscriber radio. The
host is responsible for control-oriented tasks such as decoding and
responding to user inputs.
IC See integrated circuit.
IF Intermediate Frequency.
impedance The total opposition, including both resistance and reactance, that a
circuit offers to the flow of alternating current (AC) or any other varying
current at a particular frequency.
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 See inbound signaling word.
key-variable loader A device used to load encryption keys into a radio.
kHz See kilohertz.
kilohertz One thousand cycles per second. Used especially as a radio-frequency
unit.
KVL See key-variable loader.
LCD See liquid-crystal display.
LED See LED.
light emitting diode An electronic device that lights up when electricity is passed through it.
Term Definition