User's Manual

Table Of Contents

MDS 05-2873A01, Rev. A MDS

Net 900 Installation and Operation Guide 3

DRAFT 6—8/29/01

2.2 Spread Spectrum Radios—

How Are They Different?

The main difference between a traditional (licensed) radio system and

the

Net transceivers is that these units “hop” from channel to channel

many times per second using a specific hop pattern applied to all radios

in the network. A distinct hopping pattern is provided for each of the

network name, thereby minimizing the chance of interference with other

spread spectrum systems. In the USA, and certain other countries, no

license is required to install and operate this type of radio system.

2.3 Typical Applications

Wireless IP/Ethernet LAN Connectivity

This is the most common application of the MDS

Net 900 transceiver.

It consists of a central control station (Access Point) and one or more

associated Station Adapter units, as shown in Figure 2. A LAN provides

communications between a central host computer and remote terminal

units (RTUs) or other data collection devices. The operation of the radio

system is transparent to the computer equipment with the Access Point

station serving as the gateway to the WAN or host computer.

Invisible place holder

Figure 2. Typical wireless LAN

Point-to-Point System

A point-to-point configuration (Figure 3) is a simple arrangement con-

sisting of just two radios—a Access Point and a Station Adapter. This

provides communications link for the transfer of data between two loca-

tions.

iNet S.A.

iNet A.P.

iNet S.A.

HOST

COMPUTER

RTU