ZigBee Technology

ZigBee Technology

• zigBee is low rate wireless public are network (PAN), that was developed by IEEE 802.15.4 task group. 
• IEEE 802.15.15.4  task group focused on low data rate wireless public are network (WPAN) solution with low complexity and very long battery life.
• Hence , ZigBee is a low power, low data rate, low bandwidth and close proximity wireless adhoc  network.

Frequency band

• ZigBee is intended to operate  in the unlicensed and international frequency bands.
• The three frequency bands allocated to  this standard are 868 Mhz , 915 MHz and 2.4 GHz band.

Type of modulation 

• ZigBee transmits a speed spectrum modulated signal by using either binary PSK (BPSK) or minimal PSK (MPSK) modulation depending on the data rate.

Range 

• The range of ZigBee standard is between 10 and 75 meters line- of - sight depending on power consumption.
• The ZigBee MAC layer Support different adhoc topology and guaranteed  packet delivery.

Security 

• ZigBee network are secured by 128 bit symmetrical encryption keys. ZigBee is best suitable for intermittent data transmission.

Features of ZigBee 

1. small rang (10 or 75 m).
2. low cost.
3. Low battery consumption.
4. Low data rate (upto 250kbps).
5. It is easy to implement.
6. It uses low power digital ratio links for connections. 
7. Secured communication by 128 bit symmetrical encryption key.
8. ZigBee can automatically establish its network. 
9. Frequency band 868 MHZ , 915 MHz, 2.4GHz.
10. used  spread spectrum communication.

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