Wireless LAN Technology for SOHO
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Wireless LAN Technology for SOHO
Instructor: Professor Mort Anvari
Presented by: Yanfeng Wang
Jie Lin
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Road Map
• What is a wireless LAN
• Advantage of wireless LAN
• Hardware Requirement
• WLAN Model
• Standards
• Issues to Be Solved
• Future
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What Is A Wireless LAN (WLAN)?
• A Wireless LAN is a LAN without conventional network cabling.
• It is a flexible network that can either replace or extend a wired LAN to provide added functionality.
• It relies on radio frequencies (RF) to transmit and receive data between computers.
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Advantages of WLAN---Mobility
• Users can move around and still remain connected to the network– It gives users greater flexibility to move
computers anywhere in home or office and still have them be networked.
– Networking computers in different rooms or on different floors might need the convenience of a WLAN.
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Advantages of WLAN: Reliability
• Cable fault is completely eliminated! – Wired network maybe reliable, but cable faults
is still a problem, which can cripple network traffic, and tracking them down can take many hours.
• Cables break makes metallic conductors rust or allow water to enter
• Staff members accidentally cut cables
• Workers do a shoddy job of splicing
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Advantages of WLAN: Cost• Sometimes cabling is too costly or impossible
– cabling between buildings can be expensive
– impossible due to structural hurdles or digging restrictions
• Long-term cost concerns: Recabling can be expensive, time-consuming, disruptive. – Company Reorganization moves employee around,
reconfigure offices, and add new buildings.
– Home Renovation:Children move out, Adult switch around, add rooms or initiate remodeling projects.
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A Wireless LAN
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Hardware Requirement
• Wireless NIC and PCMCIA
• Wireless Hub (Access Point)
• Wireless Bridge
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Wireless NIC/PCMCIA– Wireless adapters are made in the same form factors
as their wired counterparts - PCI, PCMCIA, and USB.
– Adapters for wired LAN provide the interface between the network operating system and the wire.
– Adapters for WLAN provide the interface between the network operating system and an antenna, to create a transparent connection to the network.
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Wireless NIC/PCMCIA
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Wireless Hub (Access Point)
• Access Point is the wireless equivalent of a LAN hub.
• It use antenna to receive, buffer and transmit data among the member computers of a WLAN
• An Access Point can be connected with the wired backbone through standard Ethernet cable.
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Wireless Hub (Access Point )• Like the cells in a cellular phone network,
multiple Access Points can support roaming from one Access Point to another as the user moves from area to area
• Access Points have ranges from 20 meters to 500 meters
• A single Access Point can support 15 to 250 users, depending on the technology and configuration.
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Wireless Hub (Access Point)• It is easy to scale up WLANs by adding
more Access Points, which decreases network congestion and enlarges the coverage area.
• Large facilities require deployment of multiple Access Points to create overlapping cells for constant connectivity to the network.
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A Wireless Hub (Access Point)
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Wireless LAN Bridge
• Outdoor LAN bridges connect LANs in different buildings. – highways
– bodies of water
• It provides a less expensive alternative to recurring leased-line charges. – It supports fairly high data rates and ranges of several
miles with the use of line-of-sight directional antennas.
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Wireless LAN Bridges
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WLAN-Peer to Peer Model
• It consists of two or more PCs equipped with wireless NICs, but with no connection to a wired network.
• It is principally used to quickly and easily set up a WLAN where no infrastructure is available– a convention center
– a trade fair
• No Access Point is needed.
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Peer to Peer Model
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WLAN-Client/Server Model
• It typically consists of multiple computers (both the servers and the clients) equipped with wireless NICs and an Access Point that acts as a traffic center of the WLAN
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Client/Server Model
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Mixed Model
• Wired LAN and wireless LAN are not mutually exclusive.
• Wired LANs and wireless LANs can join seamlessly.
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Mixed Model
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Price: Current Not for shallow pockets
• Expensive compared to wired LAN– Wireless NIC: $40 up– Wireless PCMCIA: $100 up– Wireless Hub: $200 up
• Don’t worry, it is quickly dropping!
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Where To Buy?
• Electric Appliance Retailers:– BestBuy, Circuit City, CompUSA
• Online Retail Stores:– buy.com, egghead.com
• Manufacturer’s Online Store– sohoware.com, cisco.com
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Major Hardware Manufacturers
IntelCisco3ComLucentNetgearSOHOWare
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Standards---802.11
• Like all IEEE 802 standards, the 802.11 standard focuses on the bottom two levels of the ISO model, the physical layer and data link layer.
• Any LAN application, network operating system or protocol, including TCP/IP, will run on 802.11 compliant WLANs as easily as they run over Ethernet.
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Potential for Improvement• Predictability:
– Walls, large appliances, and other obstacles can interfere with the propagation of radio waves, degrading the network’s performance.
• Security:
– with the network access code, anyone within the broadcast area can eavesdrop on network communications.
• Speed:
– The current speed of 1Mbps to 11Mbps makes it difficult to stream video across wireless network and get good results.
– Results with audio are better, but still not optimum.
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Future Growth• 75 percent of large organizations are evaluating
WLANs
• More than 90 percent of all communications traffic consists of data and not voice, which represents a huge potential of growth for wireless data communication.
• Laptops now make up about 25 percent of corporate purchases (Intel Corporate Market Research, 2000).
• Analysts agree that the WLAN market is set to reach $1.6 to $2.2 billion by 2005.
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Summary
• It is there!
• It is nice!
• It’s cost is quickly dropping!
• It’s the direction of the future!