Wired communication equipment mainly introduces serial communication, professional bus communication, industrial Ethernet communication and conversion equipment between various communication protocols, mainly including routers, switches, modem and other equipment. Wireless communication equipment mainly includes wireless AP, wireless bridge, wireless network card, wireless lightning arrester, antenna and other equipment. Communication also includes military communication and civil communication. The three major communication operators in China are mobile communication, Unicom communication and telecom communication.

Wired communication refers to the way that communication equipment needs to be connected by cables, that is, using transmission media such as overhead cables, coaxial cables, optical fibers and audio cables to transmit information.

Advantages and disadvantages

The biggest advantages of wired communication equipment are strong anti-interference, high stability, certain confidentiality, fast transmission rate and infinite bandwidth; However, wired communication is greatly influenced by the environment, with weak expansibility, attenuation, great construction difficulty, poor mobility and high cost.

wire communication facility

Commonly used wired communication equipment includes: computer, TV, telephone, PCM, optical transceiver, server, etc.

Wireless communication refers to communication that does not need physical connection lines, that is, a communication method that uses the characteristics that electromagnetic wave signals can propagate in free space to exchange information.

Advantages and disadvantages

The biggest advantage of wireless communication equipment is the environment, which does not need to be limited by wires, has certain mobility, can communicate through wireless connection in the mobile state, and has low construction difficulty and low cost; However, wireless communication equipment has weak anti-interference, slow transmission rate, limited bandwidth, limited transmission distance and low cost. However, wireless communication is changing the corresponding technology to make the transmission rate higher (the rate of 802 and 11n can reach 100Mbps not lower than that of wired communication), which is more stable and convenient, so wireless communication equipment will be the development trend.

Wireless communication equipment

Satellite, radio station, wireless TV (on bus or subway), wireless local area network, mobile phone (mobile phone), GPRS Internet access, etc.

Vehicle-mounted terminal is a kind of vehicle-mounted equipment used for vehicle positioning service. It is a vehicle-mounted equipment that can provide positioning, navigation, anti-theft, anti-robbery, information release, internet access, games and multimedia services for vehicle users.

Widely used in: public security, medical treatment (120 ambulance), car rental, taxi dispatching, long-distance passenger transport and private vehicle safety monitoring.

component

It consists of GPS module, GSM module, control module and peripheral equipment.

The GPS module receives the positioning information of communication and navigation satellites, which is calculated and analyzed by the control module, and then sent to the GSM module. The GPRS function of the GSM module further calculates and analyzes the data, making it into information that people can read, and people can use this information to dispatch, manage and control vehicles. All data communication links are bidirectional.

major function

1. Positioning function: After GPS realizes satellite positioning, the terminal LCD displays the latitude, longitude, speed, azimuth and altitude, and sends the data above the monitoring target back to the monitoring center by GPRS or GSM;

2. Self-navigation function: self-contained display displays the longitude, latitude, altitude and speed of the target, and receives the central navigation information;

3. Robbery alarm function: When encountering a road robber, start the hidden alarm button in the cab, and the on-board system will automatically send an alarm signal to the monitoring center until it receives a response from the monitoring center;

4. Tracking function: After the vehicle is stolen or robbed, the monitoring center can automatically track the alarm vehicle;

5. Send status function: press the number keys to send the pre-written status (road resistance, fault, accident help, call, etc.) to the monitoring center;

6. Text-to-speech function: the monitoring center sends dispatching instructions and short messages, and the terminal will automatically read them with female voice; (optional)

7. Remote flameout function: During the rescue of hijacked vehicles, the center can rescue vehicles that need remote control to forcibly flameout, and the system is equipped with double insurance, so that equipment failure will not cause accidental flameout;

8. Cross-border alarm function: the system can preset the driving range of the vehicle, and the system will automatically alarm the center if it exceeds this range, and the vehicle will automatically give a voice prompt and icon display to cross the border;

9. Overspeed alarm function: the system can set the vehicle speed in advance, and the system will automatically alarm the center when it exceeds this speed range, and the system will automatically generate statistical reports;

10. Driving track recording function: automatically record the driving data of the vehicle. The data is recorded in the FLASH memory inside the terminal, and the data will not be lost in case of unexpected power failure.