User's Manual

90
LifeBook T Series Tablet PC - Appendix
Before Using the Wireless LAN
The Integrated Wireless LAN is an optional device avail-
able for Fujitsu mobile computers. This manual
describes the basic operating procedures for the Wireless
LAN (referred to as the “device” in this manual) and
how to set up a wireless LAN network. Before using this
device, read this manual carefully to ensure correct oper-
ation of the device. Keep this manual in a safe place for
reference while using the device.
Types of Wireless LANs Covered by this Document
This document is applicable to systems containing one
of the following two devices. Most of the procedures are
identical. Sections that differ between the two devices
have been noted in the text:
■
Intel PROSet Wireless LAN
■
Broadcom Wireless LAN
To determine which device is present in your system,
click [Start] -> Control Panel. If there is an icon named
“Intel PROSet”, you have the Intel device; if there is an
icon named “Broadcom Wireless Utility”, you have the
Broadcom device.
Characteristics of the Device
This device consists of a wireless LAN card that is
attached inside the computer via a mini-PCI slot.
The main characteristics are as follows:
■
It operates in the 2.4 GHz radio frequency band.
■
The FCC does not require the user to obtain a license
to operate this WLAN device.
■
It uses Direct Sequence Spread Spectrum (DSSS), an
RF modulation scheme that is resistant to noise.
■
This device is Wi-Fi compliant, and operates at a max-
imum data rate of 11 Mbps, as specified by Wi-Fi.
■
The maximum communication range is approxi-
mately 80 feet (25 meters) inside a building. The
range may be shorter or longer, depending upon the
installation factors, such as walls and columns.
■
Unauthorized access can be prevented with the use of
an SSID and an encryption key (also known as a WEP
key).
Wireless LAN Modes Using this Device
Ad Hoc Mode (See Figure A-1)
The “Ad Hoc Mode” refers to the network connecting
two computers using wireless LAN cards. This connec-
tion is called an “Ad Hoc network.”
Using an Ad Hoc network, you can obtain a network
connection easily and at a low cost.
In the Ad Hoc mode, you can use the function
supported by Microsoft Network, such as File and Print
Sharing to exchange files and share a printer or other
peripheral devices.
To use the Ad Hoc Mode, you must set the same SSID
and the same encryption key for all the computers that
are connected. All connected computers can communi-
cate with each other within the communication range.
Infrastructure Mode (See Figure A-2)
If a number of computers are connected simultaneously
in the Ad Hoc mode, the transfer rate may be reduced,
communications may become unstable, or the network
connection could fail. This is because all wireless LAN
cards are using the same radio frequency in the network.
To improve this situation, you can use a wireless LAN
access point, which is sold separately. The wireless LAN
network is in the “Infrastructure mode” when it uses an
Figure A-1. Ad Hoc Mode Network
T Series.book Page 90 Thursday, July 31, 2003 10:49 AM