Video surveillance has traditionally been a closed-circuit analog affair run by the physical security staff. But with the rise of IP-based digital systems, video surveillance has become another application on the corporate network managed by the IT department.

Motion-activated digital surveillance cameras, including those from Mobotix and Axis, are IP-based and capture better detail than analog cameras, with video footage typically stored in corporate servers and shared over IP networks. But digital cameras tend to be almost double the price of analog cameras, so organizations think twice about throwing their old cameras out. A transition step often involves converting analog to digital streams to transmit video surveillance traffic over corporate LAN and WAN links.

That’s the approach that the state of Utah is taking in two separate agencies, the Utah Department of Alcoholic Beverages (UDABC) and the state’s Department of Transportation.

The Department of Transportation owns 700 miles of fiber-optic cabling, and among other purposes, it’s been used to stream traffic from 445 analog cameras from several manufacturers, including Pelco, back to a central data transportation monitoring center in Salt Lake City.

Richard Manser, the department's specialist for intelligent transportation systems, says the agency is halfway through a process of converting analog video streams to digital through hardware upgrades, decoders and changes to its Transcore management application to support IP-based monitoring.

“IP Ethernet is much more flexible," Manser says. “Analog requires dedicated fiber strands for each group of eight cameras. The cameras are streaming all the time and tying up bandwidth, typically 4.5 to 6Mbps per second per camera. With IP-based digital video, you can use on-demand and multicasting, which definitely is less bandwidth. Maintaining it is easier because we have people in IT experienced in network management."

UDABC, which controls liquor sales in the state, also decided on a similar analog-to-digital transition step for its 38 state-run retail liquor stores that are monitored for theft by Toshiba cameras.

“We can convert the analog Surveillix-brand cameras from Toshiba with their video-capture board now," says Kevin Perry, UDABC’s tech support specialist supervisor. The state agency would prefer fully IP-based digital cameras because “digital’s quality is better and analog cameras are not motion-sensitive." But due to considerations about expense, the decision was made more than a year ago to make a gradual transition.

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