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1.3
Terminology
Wireless
Wireless means "without wires", in contrast to the term wired.
Wireless network
Communications system (series of devices, appliances, methods and
protocols) for the transmission of information via radio, typically radio-
frequency technology used instead of wired connections, making the systems
particularly fl exible.
ZigBee™
Zigbee™ is a set of specifi cations based on the IEEE-802.15.4 standard for
the creation of Wireless Personal Area Networks (WPAN). Comparable in
some ways to Bluetooth, it stands out for its very low power consumption
and the reduced cost of implementation, despite having a maximum data
transfer speed of 250 kbit/s. ZigBee™ devices, with compact dimensions and
low costs, are designed to work in dedicated self-organised networks (Mesh
networks) and are used in many fi elds.
1.4 Advantages of the wireless system
Advantages of a wireless network over a wired network
•
Mobility of sensors;
•
Easy to install and connect the devices;
•
Coverage even where obstacles are present;
•
Flexibility in the event of structural modifi cations;
•
Reduction in wiring costs;
•
Robustness.
The advantages of wireless networks can overcome some of the intrinsic limits
in wired systems. Typical network infrastructure features a wired backbone
with wireless access.
Advantages of ZigBee™
•
Standard technology;
•
Reduced costs;
•
Can be used globally;
•
Reliable;
•
Supports a large number of nodes;
•
Easy confi guration;
•
Long battery life;
•
Secure data transmission.
Velocity
All brands and names shown in the diagram are registered trademarks and
the property of their respective owners.
Fig. 1.b
9
Consumption
"Wireless probes" +0300030EN - rel. 1.0 - 16.07.2010
ENG
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