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 pointsNo structureCommunicates by nodes; all nodes can transmit to other nodesOne 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 office11 MbpsSecure Internet Access128 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 capabilityWith 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