INFINOVA WATCHES OVER EIGHT EXPRESSWAYS IN CHINA'S SHANXI PROVINCE
Infinova delivered 2,870 cameras of varying types to cover 516 miles of expressways throughout the northern province of Shanxi in China. Expressways include Shangman, Xihan, Baoniu, Weipu, Shangjie, Baomao, Tongxi and Zhong'nan Mountain Tunnel. Besides Infinova cameras, the implementations also include Infinova matrix switchers, DVRs, fiber optic transceivers and modems, housings, Ethernet modems and other Infinova equipment.
The wide dynamic range (WDR) cameras are featured throughout the expressways. For example, the Zhong'nan Mountain Tunnel, the longest tunnel in China at 11 miles, uses 305 cameras to monitor low-light conditions within the tunnel. WDR cameras offer advantages over CCD cameras, providing a higher signal-tonoise ratio, improved color rendering and better image quality. They yield excellent video for the various expressway surveillance sites, all of which require detailed images under difficult lighting conditions.
Surveillance systems used on the expressways differ from traditional systems. The highway systems have decentralized edge sites distributed along the expressways, all of which need to stand up to weather extremes, temperature fluctuations and other rigors of an outdoor environment. Due to the long distances, transmission quality is a challenge and fiber is the best choice for these intelligent transport systems. To ensure reliability, both node fiber optic modems and video encoders are deployed.
The use of a node fiber optic modem greatly reduces the engineering costs of an expressway surveillance system. Video transmission system is networked through one or two fibers. Deploying a standard time division multiplex and an add/drop multiplex approach, the node fiber optic modems save fiber resources and extend transmission distances.