MDS 05-3301A01, Rev. C
MDS 9810 Installation and Operation Guide
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2.1 Spread Spectrum Radios—How Are They
Different?
The main difference between a traditional (licensed) radio system and
the MDS 9810 transceiver 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 65,000 available network addresses, 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.
2.2 Typical Applications
Multiple Address Systems (MAS)
This is the most common application of the transceiver. It consists of a
central control station (master) and two or more associated remote units,
as shown in Figure 3. An MAS network provides communications
between a central host computer and remote terminal units (RTUs) or
other data collection devices. The operation of the radio system is trans-
parent to the computer equipment. When used in this application, the
transceiver provides an excellent alternative to traditional (licensed)
MAS radio systems.
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Figure 3. Typical MAS Network
RTU
RTU
RTU
RTU
RTU
MASTER RADIO
(MDS 9820 Shown)
REMOTE RADIO
REMOTE RADIO
REMOTE RADIO
REMOTE RADIO
REMOTE RADIO
HOST SYSTEM
