Zigbee

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ContentsPage No.

1. Abstract…………………………………………………….…..1

2. Introduction……………………………………………….…...3

3. Need of ZigBee…………………………………………….…...3

4. Network Feature………………………………………….…....4

5. Technical Data…………………………………………….…...5

6. Operating Frequency…………………………………….…....6

7. ZigBee Network Model…………………………………….….6

8. ZigBee Stack……………………………………………….…..7

9. Application………………………………………………….….8

10. Market Opportunities………………………………………....8

11. ZigBee v/s Bluetooth

(I) Bluetooth seems suited for……………………………….................9

(II) While ZigBee is better suited for…………………………….….......9

(III) Air Interface comparison…………………………………….….......9

(IV) Power consideration…………………………………………………9

12. Conclusion…………………………………………………….10

13. Bibliography…………………………………………………...10

➢ Introduction:

ZigBee wireless mesh technology has been developed to address sensor and control application with its promise of robust and reliable, self-configuring and battery-efficient approach to adding wireless to any application, fixed or portable. A typical IEEE 803.15.4-based, ZigBee-complaint device is shown in figure 1.

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Figure 1. Typical 802.15.4/ZigBee Device that has included antenna, RF data modem, applications processor, all necessary passive and 16MHz crystal about 15x40mm – Courtesy Freescale Semiconductor. The ZigBee Alliance released their specification to the public in June 2005, and since then the playing field has become much simpler for product designer who want to their sensor or control application. An open and growing industry group of more than 180 companies from product/system OEMs to application developers to semiconductor companies, the Alliance has worked hard to provide a technology that takes best advantages of the robust IEEE STD 802.15.4 short-range wireless protocol, adding flexible networking, strong security tools, well-defined application profiles, and a complete interoperability, compliance and certification program to ensure that end products designed for residential, commercial and industrial spaces work well and network information smoothly.

Need of ZigBee:

There are a multitude of standards that address mid to high data rates for voice, PC LANs, video, etc. However, up till now there hasn’t been a wireless network standard that meets the unique needs of sensors and control devices. Sensors and controls don’t need high bandwidth but they do need low latency and very low energy consumption for long battery lives and for large device arrays.

There are a multitude of proprietary wireless systems manufactured today to solve a multitude of problems that also don’t require high data rates but do require low cost and very low current drain.

These proprietary systems were designed because there were no standards that met their requirements. These legacy systems are creating significant interoperability problems with each other and with newer technologies.

The ZigBee Alliance is not pushing a technology; rather it is providing a standardized base set of solutions for sensor and control systems.

The physical layer was designed to accommodate the need for a low cost yet allowing for high levels of integration. The use of direct sequence allows the analog circuitry to be very simple and very tolerant towards inexpensive implementations. The media access control (MAC) layer was designed to allow multiple topologies without complexity. The power management operation doesn’t require multiple modes of operation. The MAC allows a reduced functionality device (RFD) that needn’t have flash nor large amounts of ROM or RAM. The MAC was designed to handle large numbers of devices...
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