16-07-2011, 04:00 PM
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ZIGBEE
Wat is Zigbee?
Characteristics
ZigBee-based wireless devices operate in 868 MHz,915 MHz, and 2.4 GHz frequency bands.
The maximum data rate is 250 K bits per second.
What Does ZigBee Do?
Designed for wireless controls and sensors
Operates in Personal Area Networks (PAN’s) and device-to-device networks
Connectivity between small packet devices
Control of lights, switches, thermostats, appliances, etc.
IEEE 802.15.4 Device Types
Three device types
Network Coordinator
• Maintains overall network knowledge; most sophisticated of the three types; most memory and computing power
Full Function Device
• Carries full 802.15.4 functionality and all features specified by the standard
• Additional memory, computing power make it ideal for a network router function
• Could also be used in network edge devices (where the network touches the real world)
Reduced Function Device
• Carriers limited (as specified by the standard) functionality to control cost and complexity
• General usage will be in network edge devices
• All of these devices can be no more complicated than the transceiver, a simple 8-bit MCU and a pair of AAA batteries!
Comparison
Power Consumption
Complexity
Cost
Topologies
Star Topology
Peer to peer topology
Mesh Topology
Mesh networks
Coordinators
A coordinator, which organizes the
network and maintains routing tables.
■ Routers, which can talk to the coordinator, to other routers and to reduced-function end devices.
End devices
Reduced-function end devices, which
can talk to routers and the coordinator, but
not to each other.
A mesh network
Advantages
Reliable
Supports large number of nodes
Easy to deploy
Very long battery life
Secure
Low cost
Can be used globally
Home automation
ZIGBEE
Wat is Zigbee?
Characteristics
ZigBee-based wireless devices operate in 868 MHz,915 MHz, and 2.4 GHz frequency bands.
The maximum data rate is 250 K bits per second.
What Does ZigBee Do?
Designed for wireless controls and sensors
Operates in Personal Area Networks (PAN’s) and device-to-device networks
Connectivity between small packet devices
Control of lights, switches, thermostats, appliances, etc.
IEEE 802.15.4 Device Types
Three device types
Network Coordinator
• Maintains overall network knowledge; most sophisticated of the three types; most memory and computing power
Full Function Device
• Carries full 802.15.4 functionality and all features specified by the standard
• Additional memory, computing power make it ideal for a network router function
• Could also be used in network edge devices (where the network touches the real world)
Reduced Function Device
• Carriers limited (as specified by the standard) functionality to control cost and complexity
• General usage will be in network edge devices
• All of these devices can be no more complicated than the transceiver, a simple 8-bit MCU and a pair of AAA batteries!
Comparison
Power Consumption
Complexity
Cost
Topologies
Star Topology
Peer to peer topology
Mesh Topology
Mesh networks
Coordinators
A coordinator, which organizes the
network and maintains routing tables.
■ Routers, which can talk to the coordinator, to other routers and to reduced-function end devices.
End devices
Reduced-function end devices, which
can talk to routers and the coordinator, but
not to each other.
A mesh network
Advantages
Reliable
Supports large number of nodes
Easy to deploy
Very long battery life
Secure
Low cost
Can be used globally
Home automation
