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 LAWN

Infrared Transmission Shorter range than RF More secure Requires a line of sight Interruption by sunlight

IEEE : IEEE 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 Layers Physical (PHY) layer The PHY actually handles the transmission of data between nodes.

IEEE 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 b 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 , 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 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