Node optical transceiver in Expressway monitoring system (1)

Since 1988, China's first Highway — 15.9 km of motorway was opened now, China Expressway construction started rapid development to the world, as of the end of 2008 the opening of the national highway mileage 6.03 million km, ranked second in the world, and last year alone through the new initiates 6433 km freeway.

I. prospect Expressway monitoring system

Since 1988, China's first Highway — 15.9 km of motorway was opened now, China Expressway construction started rapid development to the world, as of the end of 2008 the opening of the national highway mileage 6.03 million km, ranked second in the world, and last year alone through the new initiates 6433 km freeway.

According to the 2005 announced plans for the development of the motorway network, China is fully committed to speeding up the national motorway network of the main skeleton construction, 2020, basically the national highway network, by then, the total mileage China Expressway traffic will reach 10 million km, security vendors and contractors, this undoubtedly contains enormous business opportunities.

China Expressway monitoring system from scratch, from small to large, from imitation abroad to complete their own design and develop suitable for standard, our country has made considerable achievements.

With freeway construction milestone of growing, on Freeway Management requirements and continuous improvement, management, data communication, image monitoring is already a modern highway construction is an indispensable part of it.

2. particularities of the expressway monitoring system

And typical of the CCTV system, freeway set monitoring points scattered, front-end monitoring equipment distribution along the highway and long distance, and environmental conditions relatively complex, front-end devices on the wild rugged adaptability requires extremely high.

Because video transmission distance, on transmission quality also proposed higher requirements. Therefore, highway video surveillance system and conventional closed-circuit television monitoring system of the important differences in the front-end monitoring point equipment technical conditions and signal transmit two key technology solution.

In view of the particularities of the expressway monitoring system, fibre became the preferred Expressway monitoring system, allowing the transmission medium optic in Expressway monitoring system has the function to be neglected.

In the past Expressway monitoring system, using more traditional digital video, point-to-point optical transceiver. This optical transceiver has a significant price advantages, but because of the particularity of the expressway monitoring system, using point-to-point optical transceiver has significant drawbacks, front-end each monitoring points must be laying a fiber to the monitoring center, along with the growth of highway mileage, monitoring and control points of the increase, the number of engineering in fiber will also be greatly increased, so did the project cost.

3. node-type optical transceiver and its advantages

Node type optical transceiver, significantly reducing the cost of the expressway monitoring system project.

Node type optical transceiver also known as bus transceiver, is through a single/dual fiber link-network image transmission system, also known as link-transceiver. Technology is commonly used in telecommunications, time division multiplexing (TDM) and OADM technology (ADM), a savings of fibre resources, to extend transmission distance, etc. As a result of using ADM technology link-type optical transceiver in transmission capacity was larger limit will normally be used in conjunction with ADM TDM. In the absence of surplus fibre resources, more use of TDM technology, this enables various business platform for optical communication system perfectly physically isolated a core optical fiber transmission.

Node type optical transceiver's advantages include:

· Full digital non-compressed video transmission, video quality, broadcast, and digital point-to-point transmission of non-compressed images.

· Save fibre resources than point-to-point transmission system significant savings in optical fiber core number and facilitate management and maintenance.

· Remote machine can be any combination and interchangeable location, convenient and flexible.

· Modular design, convenient for system expansion.

· High image quality, completely non-compressed video transmission in real time.

· Scalability, easy way to increase the image.

· Cost-effective, than using the compressed video ring network transmission system construction cost savings.

· High reliability, with light protection function, a node appear light path failure or power loss does not affect the other node.

To meet the market demand, British companies have launched feituo ten nodes, a 64-node and node-optic, and successfully applied to domestic Expressway monitoring system.

Four, ten node N3793 series optic

N3793 series 10 node-adopt a new design concept and the industry's latest technology, innovative integration of traditional video matrix control system, no need to switch the computer-assisted image, is designed for expressway with point by point into the characteristics of applications developed by intelligent optical transmission equipment.

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