Microwave for Highway Surveillance

Posted by Sam Churchill on

Exalt announced today that the Colorado Department of Transportation (CDOT) has deployed Exalt microwave backhaul systems to support a video surveillance and traffic statistics collection system on a 30-mile stretch of US Highway 36 between Boulder and Denver.

The Exalt systems proved reliable from the day they were activated, says Exalt partner KNS Communications of Denver. They now deliver high resolution video from the distributed camera system on US Highway 36 back to the CDOT operations center in Golden, Colorado.

The initial plan called for Wi-Fi radios in the 2.4 and 5 GHz spectrum, but they didn’t do the job. “We were initially told by the first wireless vendor that their radios would reach up to 22 miles, but due to the topography, they required us to deploy 18 hops to cover the distance,” said CDOT project engineer Jill Scott. KNS recommended Exalt’s backhaul using the 5.8 GHz band with 100 Mbps of Ethernet.

“The Exalt systems cover the entire project with just seven hops, despite the curves and hills on the route,” said Jill Scott.

The Exalt microwave backhaul allows network operators to assign most of the aggregate bandwidth from the cameras in the upstream direction on each link without waste to the operations center. These links are configured for aggregate capacity of 100 Mbps Ethernet.

Once received by the operations center, CDOT uses the video and traffic statistics to populate a public traffic conditions web site operated by CDOT and to enable real-time monitoring of highway conditions for situational response by CDOT crews if necessary.

Meanwhile, the Indiana Dept. of Transportation has deployed a statewide wireless Intelligent Transportation System (ITS) incorporating many different components – from speed and weather sensors, to dynamic messaging signs, to video surveillance cameras. Proxim Wireless ties their system together with an end-to-end wireless network.

I-DOT’s new wireless network connects traffic and video components over hundreds of square miles, enabling the following traffic-related applications.

Initially, INDOT had evaluated several competing wireless technologies, including products from Alvarion and Firetide. At the end of the day, the autonomous operation of Proxim’s MP.11 5054 and 5012 series radios performed better and offered greater value than the other offerings, INDOT reported in Proxim’s white paper.

Posted by Sam Churchill on Tuesday, May 25th, 2010 at 8:23 am .

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