Infinova announced that 2,870 Infinova cameras are covering 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.
Infinova announced that 2,870 Infinova cameras are covering 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.
"These complex installations show how obtaining equipment, from the cameras with several types of transmission technologies, to the DVRs, from the same vendor can make implementing such systems easier," said Mark Wilson, Marketing VP, Infinova. "For instance, the Shangman Expressway is integrated with 136 sets of Infinova WDR, dome and PTZ cameras as well as matrix switchers. The Xihan Expressway features the same cameras plus 260 pairs of fiber optic modems."
The WDR cameras are featured throughout the expressways. For example, the Zhong'nan Mountain Tunnel, at 11-mile the longest tunnel in China, uses 305 WDR to view through the low-light and illumination within the tunnel. WDR cameras offer superiority over CCD cameras, providing a higher signal to noise ratio, improved color rendering and better image quality, yielding 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 surveillance 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 the other rigors of an outdoor environment. Due to the long distances, transmission quality is a challenge and fiber is the best choice for the intelligent transport systems. To assure reliability, both node fiber optic modems and video encoders/decoders are deployed.
The use of a node fiber optic modem reduces the engineering costs of an expressway surveillance system. Also called a bus digital fiber optic modem or link type digital fiber optic modem, the 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.