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66 Part I: Wireless Networking Fundamentals the system can talk to every other radio, and in doing so they can retransmit the commands you send throughout the home. The most common metaphor here is the frog in the lily pond — the frog can’t jump all the way across the pond in one fell swoop, but he can bounce from pad to pad until he finds his way across. A wireless home control network does the same thing, “organizing” itself and providing a route throughout the home for your control signals. The network effect is in full effect in mesh networks like this. In case you’re not familiar with it, the network effect states that the value of networked devices is exponentially related to the number of those devices. (For example, if only one fax machine existed in the world, it would be useless; if millions exist, they can be very useful.) A similar thing is true for mesh networked home control devices (called modules). One or two would work okay, if they were near each other, but when a home has dozens (or even hundreds), all sorts of devices can communicate with each other and the whole network will perform significantly better. The two main technology competitors for this (still new) marketplace are � ZigBee: ZigBee is a wireless automation networking standard based on an international standard (called IEEE 802.15.4 — similar to the 802.11 standards used for Wi-Fi networks). As we mention earlier, ZigBee systems use a peer-to-peer networking infrastructure, called mesh networking, to reach throughout the home. ZigBee provides a data rate of 250 Kbps, while using chips that are inexpensive to manufacture. A group called the ZigBee Alliance (www.zigbee.org) — similar to the Wi-Fi Alliance — is helping manufacturers bring ZigBee products to market and helping ensure that the products work well together. As we write, only a few dozen ZigBee products are on the market, but dozens of manufacturers have joined the alliance. � Z-Wave: A Danish semiconductor company called Zensys (www.zen-sys. com) has developed a competitor to ZigBee called Z-Wave. Z-Wave is a wireless, mesh, peer-to-peer automation networking protocol that’s similar to ZigBee. Z-Wave systems operate at speeds of up to 9.6 Kbps (slower than ZigBee but still more than fast enough for home automation and control). Z-Wave products are still new to the market, but several major manufacturers, such as Leviton (www.leviton.com) and Wayne Dalton (www.waynedalton.com), are shipping products using Z-Wave. ZigBee and Z-Wave are similar systems that do not work together. That is to say, a ZigBee chip and a Z-Wave chip can’t talk to each other and work together in a home control network. But they can both be installed in the same home without causing interference nightmares. So while your ZigBee and Z-Wave networks can’t directly interoperate, there’s no problem with having both in your home (if you choose to do so) — for example, you could have a Z-Wave lighting control system and use ZigBee to control your heating and air-conditioning systems.
Chapter 3: Bluetooth and Other Wireless Networks ZigBee and Z-Wave chips can be integrated directly into an appliance or electrical device (this will be more common in the future), or they can be integrated into a control module (a device that sits between your control network and the thing you want to control, and translates network commands into commands that the end device understands, such as on or off). In Chapter 14 we talk about some common ZigBee and Z-Wave devices, how they work, and how you can integrate them into your home. 67
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Wireless Home Networking FOR DUMmIE
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About the Authors Danny Briere foun
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SPORTS, FITNESS, PARENTING, RELIGIO
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