2-5 ZigBee
2.5.1 Introduction to wireless communication.
Wireless communication is the transfer of information between
two or more points that are not connected by an electrical
conductor.
Wireless networking is used to meet many needs. Perhaps the most
common use is to connect laptop users who travel from location to
location. Another common use is for mobile networks that connect
via satellite or local antennas . A wireless transmission method is a
logical choice to network a LAN segment that must frequently
change locations. The following situations justify the use of wireless technology:
To span a distance beyond the capabilities of typical cabling,
To provide a backup communications link in case of normal
network failure,
To link portable or temporary workstations,
To overcome situations where normal cabling is difficult or
financially impractical, or
To remotely connect mobile users or networks.
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