Introduction
With the development of the communications industry, more and more users will shift the focus to mobile video communications to the top. In some special industries such as: military, public security, armed police fire and other industries, growing demand for mobile information systems, require the system not only can solve the on-site images, mobile voice transmission, but also require real-time two-way transmission of data, database information inquiries.
As mobile applications through a wireless link can only be achieved, but now widely known as spread spectrum microwave Although high-bandwidth, but limited to high-frequency points, can be visual communication, which requires fixed-point wireless transmission applications can still be used for moving vehicles in terms of high frequency wireless base can not use the vehicle in motion, may go through different obstacles affecting wireless transmission. And when the vehicle reaches a certain level of distance to the center, due to curvature of the earth and the ups and downs of the ground, between two points has been unable to guarantee the visual conditions, high frequency radio equipment has not work. Also in the city, especially some of the larger cities, due to high-rises, the center-board equipment can not provide the wireless visual environment, and mobile video is very difficult, and general narrow-band products, although with low frequency, diffraction ability, the characteristics of transmission distance, but a lower rate of image transmission is difficult to meet the requirements.
iNET advanced frequency hopping spread spectrum radio technology, equipment, very strong anti-interference ability. Using special encryption, strong safety performance. Work on 340MHz radio frequency band, low frequency, has a strong penetration capability and diffraction, transmission distance, and because the station uses digital signal processing technology and FEC Forward Error Correction technology, it has a high signal reception sensitivity and can guarantee a reliable signal transmission to make it more difficult to adapt to urban wireless environment is the case of the application. Radio air transmission rate of up to 512/256kbps, to meet the general image of the requirements over the same time providing a device Ethernet port, two serial ports, with video servers and other devices that can provide images, voice and data solutions.
As iNET radio with the above characteristics, we can put a tower on the center of 8.5dBi omni-directional antenna, moving vehicles on the car put a 5.6dBi antenna, in the case of line of sight transmission distance of 50KM can guarantee, if must stop the case, promised more than ten km radius of several kilometers to the site within the real-time transmission of images back to command center. For a large urban area or building block is very serious, we can use more cellular base stations, networking, making the moving vehicles can roam between multiple base stations, switching, increasing the coverage of base stations, but also improve the overall wireless network bandwidth.
Using INET300 network equipment can easily provide users with a mobile multimedia network designed for the command center to provide a simple on-site images to improve the command of the command center on-site efficiency. At the same time, on-site staff can also set special networks of real-time wireless access to the internal network, relevant data files, to achieve on-site office, greatly improve work efficiency.
System Topology
INET radio wireless LAN is the most common applications. It consists of central control station (AP) and one or more associated remote units (Remote) form, providing a LAN WAN / LAN centers and remote communication between Ethernet nodes.
In the system, access point (AP) is placed in it and all of iNET remote unit (Remote) communication place. Usually installed in high buildings or communications towers on top. Information is exchanged at the Ethernet layer, including all types of IP protocol.
INET a remote unit (Remote) only with the access point (AP) Communication. Remote communication between the same level occur only indirectly through the AP; AP can only communicate with the Remote, two AP through the Ethernet connection between the communication device in a common LAN / WAN on communication.
Application 1:
Application 2:
Application 3:
This article is from Beijing Industrial network grid company, thanks.
