Video transmission is a necessity of this age, be it home, business, bank, hospital, security, education, space center, libraries, weather forecast, scientific research or___________ Many ways have evolved for the transmission of video over different medium. Wi-fi is today's widely used video transmission medium.However its advantages are minimized when it comes to power efficiency, (a typical WI-fi chip/module consumes about 0.87 watts/24hrs). ZigBee on the other hand consumes 0.39 watts
Saturday, 15 December 2012
Wednesday, 12 December 2012
Zigbee
What Is Zigbee:-
Zigbee is today's emerging wireless technology used widely in:
- Home automation and Security purposes
- Industrial control
- Health Care Monitoring
- HVAC control
- Water level sensing
- many other control and monitoring.
Main emphasis in Zigbee is on low power handling in WPAN (Wireless Personal Area Networking). P2P (Peer to Peer), Mesh and Cluster networks are possible using Zigbee. Zigbee aims in low cost, short range, reduced bit-rate data transmission. Its comparison with other wireless technologies is given in the table below:
ZigBee
|
802.11
(Wi-Fi)
|
Bluetooth
|
UWB (Ultra Wide Band)
|
Wireless USB
|
IR Wireless
|
|
Data Rate
|
20,
40, and 250 Kbits/s to 1Mbits/s
|
11
& 54 Mbits/sec
|
1
Mbits/s
|
100-500
Mbits/s
|
62.5
Kbits/s
|
20-40
Kbits/s
115 Kbits/s 4 & 16 Mbits/s |
Range
|
10-100
meters
|
50-100
meters
|
10
meters
|
<10
meters
|
10
meters
|
<10
meters (line of sight)
|
Networking Topology
|
Ad-hoc,
peer to peer, star, or mesh
|
Point
to hub
|
Ad-hoc,
very small networks
|
Point
to point
|
Point
to point
|
Point
to point
|
Operating Frequency
|
868
MHz (Europe)
900-928 MHz (NA), 2.4 GHz (worldwide) |
2.4
and 5 GHz
|
2.4
GHz
|
3.1-10.6
GHz
|
2.4
GHz
|
800-900
nm
|
Complexity (Device
and application impact)
|
Low
|
High
|
High
|
Medium
|
Low
|
Low
|
Power Consumption
(Battery option and life)
|
Very
low (low power is a design goal)
|
High
|
Medium
|
Low
|
Low
|
Low
|
Security
|
128
AES plus application layer security
|
64
and 128 bit encyption
|
||||
Other Information
|
Devices
can join an existing network in under 30ms
|
Device
connection requires 3-5 seconds
|
Device
connection requires up to 10 seconds
|
|||
Typical Applications
|
Industrial
control and monitoring, sensor networks, building automation, home control
and automation, toys, games
|
Wireless
LAN connectivity, broadband Internet access
|
Wireless
connectivity between devices such as phones, PDA, laptops, headsets
|
Streaming
video, home entertainment applications
|
PC
peripheral connections
|
Remote
controls, PC, PDA, phone, laptop links
|
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