Download Wireless LAN Products

Wireless LANs
Presented by:
Jerome Thompson
Mei-Lun Huang
Liu-Yin Hu
Kai-Wing Sum
Table of contents
How wireless LAN works
Products
Benefits
Future
How it works:
Wireless networks is networking devices to
one another to transfer data, and
communicate with each other.
Networking is done by nodes, and PCI
cards.
Hub
Radio Frequency:
RF waves ranges from 2.4 to 2.48 GHz
bandwidth.
Short waves i.e. FM/AM radio,
TV, cell phones…
Radio Frequency
Frequency Hopping Spread Spectrum
(FHSS) transmission hops from one
channel to another channel till one is free.
 Divides the 2.4 GHz bandwidth

Direct-Sequence Spread Spectrum.

(DSSS) is a transmission technology used in
LAWN transmissions where a data signal at the
sending station is combined with a higher data
rate bit sequence
Infrared Transmission
Shorter range than RF
More secure
Requires a line of sight
Interruption by sunlight
IEEE 802.11:
IEEE 802.11 sets the standards for wireless
networks
Architectures: two options in configuring a
network:
Ad-Hoc
1.
Ad-Hoc- constructing a network “on the fly”
No fix points
No structure
Communicates by nodes; all nodes can transmit
to other nodes
One master computer/device while others are the
slave.
Ad-Hoc
Infrastructure
Fixed network access points with mobile
nodes
Access points are connected to landlines to
bridge other wireless nodes to wired
nodes, similar to cellular networks.
Infrastructure
IEEE 802.11 Layers
Physical (PHY) layer

The PHY actually handles the transmission of
data between nodes.
IEEE 802.11 Layers
Medium Access Control (MAC) layer.
The MAC layer set protocols to maintain order
when sharing of data.
 CSMA/CA
 RTS
 CTS
 CRC
 ACK

Wireless LAN Products
PCMCIA
PCI Card
Access Point
Router
Application
Features
IEEE 802.11b
Direct Sequence Spread Spectrum(DSSS)
11Mbps
Wireless LAN Products
PCMCIA Wireless PC Card
Compaq WL110
Buffalo WL-PCM-L11
PCI Card
Compaq WL210
Buffalo
Access Point (AP)
Compaq WL410
D-Link DWL-900AP
Router
SparkLAN WX-5000
PCMCIA Wireless PC Card
Compaq WL110
Used for enterprise,
small or medium
business, and home
office
11 Mbps
Secure Internet
Access
128 bit Wired
Equivalent
Privacy(WEP)
encryption
Buffalo WL-PCM-L11
High speed wireless
connection, up to 11
Mbps
Plug and Play
installation
Integrated antenna
PCI Card
Compaq WL210
Extends wireless
network to
desktops, point of
sale, and other
non-portable
devices
External antenna
jack
Buffalo WLI-PCI-OP
Let desktops can
use PCMCIA
Card
11 Mbps
Access Point (AP)
Compaq WL410
Extends the range of cabled
Ethernet network, providing
easy network access to mobile
users and difficult to wire
locations
128-bit Wired Equivalent
Privacy (WEP) encryption
Investment protection
Doubling network capacity
Lower network management
costs
D-Link DWL-900AP
Point-to-point bridging
capability
With a DHCP server, the
DWL-900AP will
automatically obtain an
IP address.
128-bit WEP (Wired
Equivalent Privacy)
a USB port is provided
for flexibility in
configuring the device
Router
Spark LAN WX-5000
Same function as
wired network router
Printer Port
Firewall
The benefits of using wireless network
·Mobility
·Installation Speed and Simplicity
·Installation flexibility
·Reduced Cost –of –Ownership
Mobility
LAN systems can provide the user with
access to information anywhere in their
organization. This mobility supports
productivity and service opportunities not
possible with wired networks.
Installation Speed and Simplicity
Wireless LAN systems can be installed fast
and easy and can eliminate the need to pull
cable through walls and ceilings.
Installation flexibility
Wireless technology allows the
network to go where wire can’t go.
Reduced Cost –of –Ownership
While the initial investment required for
wireless LAN hardware can be higher than
the cost of wired LAN, overall installation
expenses and life-cycle costs can be
significantly lower. Long-term cost benefits
are greatest in dynamic environments
requiring frequent moves and changes.
Wireless LAN in your industry
 Corporate: Corporate employees can take advantage of
mobile networking for e-mail, file sharing, and web browsing
regardless of where you are in the office or outside the
building.
 Education: Enable users with notebook computers to
connect to the university network for collaborative class
discussions and to the Internet for e-mail and web browsing.
 Manufacturing & Warehouse: Link factory floor
workstations and data collection devices to a company’s
network. Improve inventory tracking and reduce the costs of
physical inventory counts.
The Future of wireless LAN
 Many companies have invest
 Wireless LAN market
 Price come down
 Small and Home business grow up fast
 Home networking will be popular
Many companies have invest
A lot of companies have begun to invest about the
wireless networking, such as Intel , Microsoft ,
IBM etc.
Microsoft built wireless support into the
successor to windows 9x, NT and later version.
Wireless LAN Market
The wireless data rate, for instance, is a
scorching fast 11 Mbps, up to 10 times
faster than the most popular home
networking products.
It is more fit on the most business, such as
transfer data, communication and Net
meeting.
Price come down
When the supply of the wireless network
device become greater than the demand,
user can spend a low price and get more
effective device.
Home and small business grow
up fast
When the price of the wireless LANs devices are
going to be more user affordable, then small and
home business wireless networking will become
more popular.
Home networking increasing
Market research firm Yankee Group
predicts that wireless LANs will make up a
quarter of home networks by 2003.
The End