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7.2. Wireless

Both Z-Wave and ZigBee have heavyweight support in the industry and are competing head

Wireless control systems within the home include the following ...

Control initiative to provide a low cost, low bandwidth offering for the control market. They

Although not yet available in Europe, Insteon has made

was released in June 2005 and it is becoming a strong competitor to Z-Wave. It is based upon

RFDs are usually battery powered leaf nodes. The particular advantage of ZigBee over other

layers and Microsoft's Simple Control Protocol (SCP) sits on top. This offers data rates up to

131KHz carrier using BPSK over the powerline for a sustained bit rate of 2.88Kbps and and

Yitran (http://www.itrancomm.com), formerly named ITRAN Communications Ltd., are

technologies simultaneously.

This gives them extended battery life of up to 2 years in some

to head in the marketplace for supremacy.

BACnet.

SmartLabs of California and is unusual in that it uses both wireless and powerline

Zigbee devices are either Full Function Devices (FFDs) or Reduced Function Devices

Differential Code Shift Keying (DCSK) modulation. They provide the Physical and DataLink

applications.

penetration in the home market whereas ZigBee seems likely to make rapid inroads into the

Z-Wave has the advantage of early market

control. If it is simply a matter of collecting ambient information and user input and changing

Z-Wave routes messages through a network and can theoretically extend to great distances. It

commercial property market which is currently dominated by wired technologies such as

progress in the US where it is backwardly compatible with X-10.

currently offering a robust system of their own, which uses their patented spread spectrum

also offers an instantaneous bit rate of 38.4Kbps over the RF 904Mhz band.

(RFDs).

was designed by ZenSys, a Danish company which founded the Z-Wave Alliance

FFDs are typically mains powered and perform the routing and hub functions.

market.

the open IEEE 802.15.4 standard at the PHY and MAC layers with upper layers developed by

are to adopt a modem by Yitran, an Israeli company, as the basis of this but it is not yet on the

The Homeplug Alliance (http://www.homeplug.org) has recently created their Command and

Insteon modulates a

the alliance for specific application areas. ZigBee is a self-organising mesh network that

quickly when required.

Frequency Shift Keying (BFSK).

products based upon the ZenSys chips and it is well established in the market place. Z-Wave

7.5kbps.

uses the unlicenced 868 MHz band in Europe and has a raw data rate of 40Kbps using Binary

Zigbee was developed by the ZigBee Alliance (http://www.zigbee.org). The specification

technologies is that the RFDs have very low current drain in sleep mode but wake up very

(http://www.z-wavealliance.org). The Alliance consists of over 125 companies producing

Another strong competitor is Insteon (http://www.insteon.net). Insteon is developed by

supports a raw data rate of 250Kbps on the 2.4 GHz band or 20Kbps on 868MHz (in Europe).

The above are all lightweight protocols designed to be low-cost and provide very limited