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Power over Ethernet Reduces Network Complexity

PoE is still relatively new. Phones and video cameras are some of the primary products using it, but flow meters and other products are connecting to industrial Ethernet networks with it as well.

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Security cameras are becoming more abundant, giving users more vision into activity in all sorts of facilities. Linking these cameras often directly into corporate networks makes data accessible everywhere, so it can be used in many different ways.

Security solutions firm AES Group Ltd. (www.aes-group.com), based in Bangkok, Thailand is a big proponent of networked camera systems, installing them in many facilities throughout Southeast Asia. Nestle is one of its customers, as are numerous transportation companies. For nearly all of these configurations, AES eliminates some wiring by utilizing the Power over Ethernet (PoE) standard, which uses conventional cabling to carry power as well as communication signals.

Use of PoE can dramatically reduce network complexity. “We use a lot of Internet Protocol (IP) video surveillance, using PoE on virtually every installation,” says Henny Beeber, chief technical officer for AES. “We can use one CAT 5 orCAT 6 cable for both [local area networking] and power. Otherwise, you have to run a separate power line, which sometimes means using a separate conduit because you can’t run power in the same conduit.”

One of its most recent installations was on Thailand’s Suvarnabhumi Airport Rail Link, a 17-mile railroad that links the international airport to downtown Bangkok. The security network includes 260 security access doors and 560 Bosch IP

network cameras installed at eight local stations and the city air terminal. Data sent over Ethernet, which includes fire alarms as well as digital video recording, can be distributed to many sources. Plenty of data is collected—each train station has 120 terabytes of video storage.

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