MDS MDS 9710 Series Specifikace stáhnout pdf (Strana 10)

2 MDS 4710/9710 I/O Guide MDS 05-3305A01, Rev. D

NOTE:

Some features are not available on all radios, based on the

options purchased and the applicable regulatory constraints for

the region in which the radio operates.

1.2 Applications

Point-to-Multipoint, Multiple Address Systems (MAS)

This is the most common application of the transceiver. It consists of a

central master station and several associated remote units as shown in

Figure 2. A MAS network provides communication 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.

Often, however, a radio system consists of many widely separated

remote radios. A point-to-multipoint or SCADA (Supervisory Control

and Data Acquisition) system might be a new installation for automatic,

remote monitoring of gas wells, water tank levels, electric power distri-

bution system control and measurement, etc.

The radio system can replace a network of remote monitors currently

linked to a central location via leased telephone line. At the central

office of such a system, there is usually a large mainframe computer and

a way to switch between individual lines coming from each remote mon-

itor. In this type of system, there is a modulator/demodulator (modem)

at the main computer, and at each remote site, usually built into the

remote monitor itself. Since the cost of leasing a dedicated-pair phone

line is quite high, a desirable alternative is to replace the phone line with

a radio path.

Invisible place holder

Figure 2. Typical MAS Point-to-Multipoint Network



I D

I A



HOST SYSTEM

REMOTE RADIO

SWC OFF

RTU



I D

I A



I D

I A



I D

I A



I D

I A

.8 V



RTU

MDS MASTER

STATION

CONTINUOUSLY

KEYED

REMOTE RADIO

SWC OFF

REMOTE RADIO

SWC OFF

REMOTE RADIO

SWC OFF

REMOTE RADIO

SWC OFF

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MDS MDS 9710 Series Specifikace Strana 10

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