Zigbee Technology2

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SEMINOR TITLE: ZIGBEE TECHNOLOGY DATE:19-3-2010


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A BSTRA CT:

v It is a technology to interact with

remotely controlled devices.

v A single remote can control many

devices.

v It mainly concentrates on HAN.


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ZIGBEE: It is a HAN designed specifically to

replace the proliferation of individual

remote controls. It is introduced by OSI reference model

in several layers.

The layers are physical layer, MAC layerand network layer.


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Zig bee Architecture:


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FRAME STRUCTURE:


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Fr a me St r uc t u r e :q It provides a payload of up to 104 bytes.

q Frame check sequence ensure that

packets are received with out error.

q Frame structure improves the reliability

in difficult conditions.

q It uses CRC- 16 for verifying framesequence.


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Fr a me St r uc t u r e :( co n t d )q It provides an ACK (acknowledgement) frame.

qMAC command frame provides the mechanism

for remote control and configuration of clientnodes.

qMAC is used to configure the individual frames.

q Beacon frame wake up the client devices whichlisten for their address and go back to sleep if theydont receive it.


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De v ic e Ty pe s:

Zig bee coordinator: It forms the root

of the network and store the information

about the network.

Zig bee router: It acts as a intermediate

and pass data from other devices.

Zig bee end device: It providesfunctionality to talk to its parent node.


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Po w e r sa v ing :

Zig bee networks are designed to

conserve the power of slave nodes.

Slave device is in deep sleep mode and

wakes up only for a fraction of seconds.

It takes 15ms for transition from sleepmode to data transition.


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Se c u r i t y :

v Access control

vData encryption through symmetrickey.

v Frame integrity

v Sequential freshness to reject data

frames that have been replayed.


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Ne t w o r k : It associates devices using the network

coordinator.

It is responsible to start a new network

and assigning address to newly associated

devices.

It supports multiple network topologieslike star, tree and mesh etc.


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Network topologies:


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General operation frame work: It is a layer between several

applications.

It consists of complete informationabout the devices.

It specifies methods, events and data

formats. It requires less than 32kb of memory.


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Example for zig bee device:


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A ppl ica t io ns :It is used in several applications like

v Industrial purposes

v Finger print keypad lock

vMotion and heat sensing solar flood

light

vWire less personal area net working


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Co nc l us i o n: It is an underlying communicationtechnology.

It provides data reliability, long batterylife and lower system costs through flexiblenetworking.

It provides network security and profilespecifications.


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References:

http://www.zigbee.com

http://www.smartthome.com

OUR CROSSBOW SENSOR

EQUIPMENT AND ZIGBEE by philipkuryloski and sameer pai.


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Zigbee Technology2