Page 105 - DCAP311_DCAP607_WIRELESS_NETWORKS

Unit 6: Wireless PAN Systems

7. Disconnect your computer from the wireless router and then reconnect wirelessly. Notes
8. Caution: Be sure to use a password to protect your wireless network. Unauthorized parties
can easily connect to an unprotected network, stealing your bandwidth as well as your
personal data.
9. Connecting Computers, Printers, and Other Devices to the Wireless Network

10. Sharing Files, Printers, and More: We can share files, printers, games, etc. after all the setup.

6.6 Accessing Personal Digital Assistant (PDAs)

A personal digital assistant (PDA) is a handheld computer. Personal digital assistants were
designed to replace non-electronic day planners. Many PDAs can work as an address book, a
calculator, a clock, and a calendar. Some also have games on them. Newer PDAs are now called
smartphones and have Wi-Fi, touch screens, can read e-mail, record video, play music and make
phone calls

6.7 Mobile Phones

A cellular network or mobile network is a radio network distributed over land areas called cells,
each served by at least one fixed-location transceiver, known as a cell site or base station. In a
cellular network, each cell uses a different set of frequencies from neighboring cells, to avoid
interference and provide guaranteed bandwidth within each cell.
When joined together these cells provide radio coverage over a wide geographic area. This enables
a large number of portable transceivers (e.g., mobile phones, pagers, etc.) to communicate with
each other and with fixed transceivers and telephones anywhere in the network, via base stations,
even if some of the transceivers are moving through more than one cell during transmission.
Cellular networks offer a number of advantages over alternative solutions:

z z flexible enough to use the features and functions of almost all public and private networks
z z increased capacity
z z reduced power use

z z larger coverage area
z z reduced interference from other signals
An example of a simple non-telephone cellular system is an old taxi drivers’ radio system, in
which a taxi company has several transmitters based around a city that can communicate directly
with each other.

Self-assessment

Fill in the blanks:
11. An example of a simple non-telephone cellular system is an old ............................. radio
system
12. In a ............................. network, each cell uses a different set of frequencies from neighboring
cells, to avoid interference and provide guaranteed bandwidth within each cell.
13. Personal digital assistants were designed to replace ............................. day planners.
14. Wireless LAN 802.11b or 802.11g provides for secure data transfer of .............................
information.

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