Why go Wireless?

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21 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

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Why go Wireless?

By Cheryl Aupperle

The Start….

communication is
something we all are
familiar with. Think
about using a walkie
talkie, listening to the
radio, using a cb radio
in cars or a cellular

Wireless Communication

Wireless communication as most of us know
it, is voice transmission through air. This
can be done with radio waves or satellite.

But in the context of this presentation,those
means of wireless communication is not what I
would like to talk to you about today….

What I had in mind to talk about today is
wireless computing
. Anyone who has ever
hooked up a computer, or looked at the back
side of the computer desk must have wondered
what can be done about all of the cords.
Wireless computer devices can be an answer to
that question, and it can also neaten up your

You can connect computers that are not even
in the same room; they may be all over your
home or office, to printers, cell phones,
PDA’s, the internet and each other. Even if
the connection is only across the room, you
won’t be tripping over cords anymore.
Computers and devices that are far apart can
be connected with a wireless bridge and/or

Wireless Computer Devices




PDAs and cell phones (depending upon the


How do they work?

Infrared waves transfer the data from your
device into your computer or to the other
device. There are other devices that use radio
waves to transmit the data.

Your computer must have a receiver
compatible with the transmission method of
your wireless device.

PC cards can make wireless devices work
with your computer or PDA

USB adapters (for some computers) can turn
a regular computer device into a wireless


Infrared devices use infrared rays like
regular remote controls do.

This is the least secure data transmission.
There is a high chance of data interference.

Data integrity is low. Infrared signals can
occasionally be ‘dropped’.

Infrared devices require a line

Shortest transmission range (5
20 feet).


Bluetooth wireless technology operates at
the 2.4 Ghz radio spectrum.
This is done
using radios with the capability to do a
spread spectrum, frequency hopping, and
duplex signal at up to 1600 hops/sec.
Up to seven simultaneous connections can
be made by the signal hopping among 79
frequencies at 1 MHz intervals to give a
relatively low chance of signal interference.

The range is about 30 feet.


RF works by having a 2

way wireless
digital communication signal between the
devices. The 2

way digital communication
allows the devices to “talk” to each other so
that no data is lost in transmission.

It has a greater range than the other 2
methods. (50

100 feet). With the extender,
you can get a range of about 500 feet.

So what’s the catch?

It is more expensive than wired devices.

Well, some experts question the security of
data transmitted wirelessly. Since the signal
travels openly through the air, anyone with
the proper software can “read” the data.

What can be done about this?

You can encrypt your data

Go back to having a wired connection

Buy your wireless devices from a company
that guarantees the security of the data

Look for wireless devices that use WPA,
have a built in firewall, or allow you to limit
the range of data transmission


Select IBM ThinkPads automatically encrypt data and uses
the IBM Embedded Security Subsystem when it is used to
send data over a wireless connection. IBM has developed
other ThinkPads with Cisco Systems Aironet that give you
even more security options.

WPA (wireless protected access) standard as opposed to
WEP (wired equivalent privacy). WPA uses a new method
for automatic encrypting keys. It also automatically checks
wirelessly transmitted data, this helps prevent any hackers
from changing packets. A new Microsoft code with WPA
that authenticates users and allows protection against users
joining rouge wireless networks.


in firewalls

The Apple Airport Extreme has a built

in firewall
and also allows users to limit the range of data

When you buy a router, check to see if it has a built

in firewall.

Limiting transmission range

Check each device to see if you can limit the range
of data transmission


Infrared: Least secure and shortest range, cheapest,
on it’s way out, most new devices are not made to
transmit infrared, compatible with virtually all
computers and OS.

Bluetooth: Most popular, average security and range,
the SIG is constantly working to improve Bluetooth,
most new devices are made to transmit Bluetooth,
compatible with any computer and OS that supports

Conclusion Continued

RF: Largest range, best data integrity, and
better security, only made by Wireless
Computing, most expensive, compatible
with several computers and OS

All wireless technology is the ‘cutting
edge’. In the future, wired devices may
stop being made altogether.

There is no right or wrong wireless
computer device choice, you have to decide
which type suits your needs.


1) Apple Computers. 5 April 2003.

2) Apple Computers and Bluetooth. 5 April 2003.

3) Wireless Computing. 9 April 2003. <http://www.wireless

4) International Business Machines. 9 April 2003.

5) Bluetooth. 9 April 2003. <http://www.bluetooth.com>.

6) Dell Computers. 10 April 2003. <http://www.dell.com>.

7) Rupley, Sebastian. “A New Spin On Wireless LAN
PC Magazine
. 10 April 2003.