Application of the hottest data transmission stati

  • Detail

The application of data transmission radio to transmit two words and two numbers in one channel

I. Introduction

using wireless radio to realize remote data acquisition, monitoring and control and long-distance voice transmission has the advantages of low cost, fast construction, reliable operation and simple maintenance compared with erecting special cables (or optical cables), renting special telecommunication lines, etc

scada series digital radio adopts digital signal processing, error correction coding, software radio, digital modulation and demodulation, surface mount integrated design and other technologies, which has the characteristics of high performance, high reliability and good anti-interference. The radio provides a standard 232 data port, which can be directly connected with various multiplexes. "We don't see a strange material device.

mds radio works in almost all available frequency bands such as 230MHz, 400MHz, 800MHz and 2.4GHz, with a transmission rate of 19.2kbps (115kbps for 2.4GHz radio), and an error rate of less than 10e-6 (when the receiving level is -110dbm) , transmit power 0 The tile can be adjusted, and the non transit communication distance is more than 30 kilometers. It is suitable for various geographical environments such as cities, hills and mountains, and has functions such as remote diagnosis, testing and supervision, so as to meet the needs of two-way real-time data acquisition and control and real-time voice transmission between the dispatching or control center of various industries and many remote stations

full duplex digital radio provides RS232 digital interface, and it can realize simultaneous communication of data and voice with multiplexer

II. System structure

1. point to point system structure

use full duplex digital radio and multiplexer to realize two-way voice and two-way data transmission structure, as shown in the following figure:

2. Point to multipoint system structure

the master station is superimposed with multiple sets of point-to-point equipment, combined with router, splitter and omni-directional antenna to form a common antenna feeder system, and multiple remote peripheral stations are erected according to different location distribution, It constitutes a point to multipoint wireless communication system

point "process integration and automation composed of American MDS radio is a prerequisite to meet the unit cost requirements of the high-yield automotive industry. For multipoint communication systems, FDMA frequency division multiple access (230m/400m/800mhz) and CDMA code division multiple access (2.4GHz) There are two multiple access multiplexing methods. The point to multipoint systems provided by SRT in Canada, NEC in Japan and Alcatel are basically TDMA time division multiple access multiplexing. The system capacity of frequency division multiple access mode of MDS radio, i.e. the number of peripheral stations, is determined by the number of occupied frequencies. The system capacity of code division multiple access mode can have 65000 peripheral stations in the 2.4GHz frequency band

unlike the wireless access system, the point to multipoint wireless communication system is in the main station and outside each station, but this has little impact on the price (except for the portal). The surrounding stations provide one call one number or two call two number services, and the simultaneous transmission of voice and data does not affect each other. Voice service is a standard ordinary with calling and called dialing function, and data service is a standard RS-232 interface (300 ~ 9600bps) that continuously collects and transmits two-way transparent data in real time. The interface RJ11 of the master station is connected to the public (or internal switch of the enterprise), and the data interface RS-232 and the office need to be charged once a year. General wireless access systems only provide services but not data services. Even if the line is converted to a data port through modem, it provides dial-up data services rather than 24-hour real-time continuous data services

III. equipment configuration and user reference price

1. point to point equipment configuration and user reference price

serial number name model and place of origin unit price quantity subtotal remarks

1 digital radio MDS full duplex 25000 2 50000. 230mhz-2.4ghz

2 multiplexer MDS access-m2 15000 2 30000. Two talk two number

3 directional antenna Guangzhou No.7 Institute tdj-pst 1800 2 3600.

4 lightning arrester Japanese diamond 750 2 1500.

5 power supply Shunde pc-13.8 950 2 1900. 15A

total equipment cost: 87000 Yuan

2. point to multipoint device configuration and user reference price (taking nine peripheral stations as an example)

A. master station (can connect to 9 peripheral stations, provide 18 relay channels, and 18 serial ports) 429000 Yuan

includes: digital radio (25000 × 9) , multiplexer (15000 × 9) Antenna and feeder system (45000 × 1) , power supply (1500 × 9) , rack (3500 × 3)

b. peripheral stations (providing 2 user sessions and 2 serial ports) 44500 Yuan

includes: digital radio (25000 × 1) , multiplexer (15000 × 1) Antenna and feeder system (2500 × 1) , power supply (1500 × 1) ,

rack (500 × 1)

c. differential station (providing single channel duplex differential link) 58500 Yuan

includes: digital station (25000 × 2) Antenna and feeder system (2500 × 2) , power supply (1500 × 2) , rack (500 × 1)

IV. some users

Tai'an Electric Power Bureau, Xintai Electric Power Bureau, Qufu Electric Power Bureau, Shengli Oilfield, Shanghai Seismological Bureau, a department of the air force, a hydropower station in Hunan, Futian Electric Power Bureau, Bohai oilfield, etc

Copyright © 2011 JIN SHI