User's Manual

Glossary

ACU

Airlink Chassis Unit—Provides the baseband

airlink processing for up to 8 RFUs, providing a

coverage span up to 250,000 square feet, and is the

interface between the RFUs and the NCU.

iSC

integrated Site Controller—Motorola’s proprietary

equipment required for all iDEN installations.

iDEN

integrated Digital Enhanced Network—Motorola’s

proprietary digital technology that combines the

capabilities of a standard analog dispatch system

with that of a cellular interconnect system. iDEN

uses an advanced proprietary modulation

technology consisting of a speech compression

scheme enabling three or six communication paths

over a single 25 kHz RF channel.

GPS antenna

global positioning system antenna—A system that

uses geostationary satellites to triangulate the

position of a GPS receiver located on the face of the

earth.

LAN

local area network—A group of computers

connected together within a building or campus.

NCU

Network Chassis Unit—The main controller of the

RFS, providing external network interfaces and the

baseband network processing for the associated

ACUs and RFUs. Also, the NCU is the interface

between the RFS and the telecommunications

switching entities.