Infinova has announced that 2870 Infinova cameras of varying types are covering 830 km 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, fibre-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,” says Mark Wilson, Infinova vice president, marketing. “For instance, the Shangman Expressway is integrated with 136 sets of Infinova WDR (wide dynamic range) dome and high-speed PTZ cameras as well as matrix switchers. The Xihan Expressway features the same cameras plus 260 pairs of fibre-optic modems.”
The WDR cameras are featured throughout the Expressways. For example, the Zhong’nan Mountain Tunnel, at 18 km (11 miles) the longest tunnel in China, uses 305 of them to view through the low-light and illumination within the tunnel. WDR cameras offer decisive superiority over CCD cameras, providing a higher signal to noise (S/N) ratio, improved colour rendering and better image quality, yielding excellent video for the various Expressway surveillance sites, all of which require detailed images under extremely difficult lighting conditions.
Surveillance systems used on the Expressways differ from traditional CCTV systems. The highway systems have decentralised edge sites, distributed along the expressways, all of which need to stand up to weather extremes, temperature fluctuations and the other rigours of an outdoor environment. Due to the long distances, transmission quality is a challenge and fibre is the best choice for these intelligent transport systems (ITS). To assure reliability, both node fibre-optic modems and video encoders/decoders are deployed.
The use of a node fibre-optic modem greatly reduces the engineering costs of an expressway surveillance system. Also called a bus digital fibre-optic modem or link type digital fibre-optic modem, the video transmission system is networked through one or two fibres. Deploying a standard time division multiplex (TDM) and an add/drop multiplex (ADM) approach, the node fibre-optic modems save fibre resources and extend transmission distances.
More information on Infinova video systems is available by going to www.infinova.com
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