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NEC BIRMINGHAM   09-11 OCTOBER 2018

If you look up "intelligent" in the thesaurus, "bright" is one of the synonyms you'll find. When Cisco decided to create an intelligent building network, allowing many IoT (Internet of Things) devices to communicate with each other, a light bulb went on over some engineer's head: "Let's use the lighting system as our network!" Thus, Cisco's Digital Ceiling was conceived. When fully implemented, the Digital Ceiling will offer building occupants a combination of information, efficiency, convenience, security, and comfort.

Efficient Use of Energy and Wiring

The Power over Ethernet (PoE) standard, officially known as IEEE 802.3bt, allows both power and data to be transferred over the same wires. When Cisco engineers looked for an IoT device that's common to all rooms, lighting was the obvious choice, so they decided that DC powered LED fixtures would be the heart of the control system.

Convergence dawsty


LED light fixtures are more efficient than incandescent or fluorescent lights, but their Achilles' heel appears to be the AC-to-DC driver. LEDs are inherently DC devices that need a driver to convert AC from the wall into DC. The driver circuit is a source of power loss and premature failure; running LEDs directly on DC improves both efficiency and reliability. Since lighting is controlled by building management systems and it can run on relatively low power DC, PoE is an ideal power source.

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