Motorola XPR 4500 Panduan Instalasi - Halaman 37

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Term

firmware

FGU

flash

frequency

generation unit

General-Purpose

Input/Output

GPIO

host code

inbound signaling

word

integrated circuit

ISW

kHz

kilohertz

LCD

LED

light emitting diode

liquid-crystal display

6816812H01

Code 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 RAM.

See frequency generation unit.

A non-volatile memory device similar to an EEPROM. Flash memory

can be erased and reprogrammed in blocks instead of one byte at a

time.

Number of times a complete electromagnetic-wave cycle occurs in a

fixed unit of time (usually one second).

This unit generates ultra-stable, low-phase noise master clock and other

derived synchronization clocks that are distributed throughout the

communication network.

Pins whose function is programmable.

See General-Purpose Input/Output.

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.

See integrated circuit.

Intermediate Frequency.

Data transmitted on the control channel from a subscriber unit to the

central control unit.

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.

See inbound signaling word.

See kilohertz.

One thousand cycles per second. Used especially as a radio-frequency

unit.

See liquid-crystal display.

See light emitting diode.

An electronic device that lights up when electricity is passed through it.

An LCD uses two sheets of polarizing material with a liquid-crystal

solution between them. An electric current passed through the liquid

causes the crystals to align so that light cannot pass through them.

Definition

Glossary-3

March 23, 2006