Wireless LAN Networking : Wireless LAN Networking PRODUSE by: PRODUSE by AMOL N. SHENDE & PRANAY D. WAGHMARE Introduction : Introduction W ireless technology has helped to simplify networking by enabling multiple Computer users to simultaneously share resources in a home or business without additional or intrusive wiring. These resources might include a broadband Internet connection, network printers, data files, and even streaming audio and video. Wireless LANs in the Office : Wireless LANs in the Office Wireless LANs in the Home : Wireless LANs in the Home IEEE Wireless Networking Specifications : IEEE Wireless Networking Specifications 802.11 802.11a 802.11b U.S. Robotics 22 Mbps 802.11b 802.11g Different W-LAN Technologies: Different W-LAN Technologies Narrowband Spread Spectrum Frequency Hopping Spread Spectrum (FHSS) Direct Sequence Spread Spectrum (DSSS) Wireless LAN Frequency Usage : Wireless LAN Frequency Usage 802.11b – bandwidth allocation: 802.11b – bandwidth allocation BANDWIDTH REQUIRED FOR EATCH 802.11: BANDWIDTH REQUIRED FOR EATCH 802.11 amol Ad Hoc (Peer-to-Peer) Mode vs. Infrastructure Mode : Ad Hoc (Peer-to-Peer) Mode vs. Infrastructure Mode Multiple infrastructure setupes : Multiple infrastructure setupes Infrastructure Mode : Infrastructure Mode Wireless Network Components : Wireless Network Components Access Point PC Card PCI Adapter Router Access Point : Access Point PC Card : PC Card PCI Adapter : PCI Adapter Router : Router WLAN Performance : WLAN Performance Distance between WLAN devices (AP and NICs) Transmission power levels Building and home materials Radio frequency interference Signal propagation Antenna type and location Distance between w-lan devices: Distance between w- lan devices Wireless LAN advantages : Wireless LAN advantages • Flexibility: within radio coverage, nodes can communicate without further restriction. Radio waves can penetrate walls. • Planning: wireless ad hoc networks allow for communication without planning. Wired networks need wiring plans. • Robustness: wireless networks can survive disasters, if the wireless devices survive people can still communicate Wireless LAN disadvantages : Wireless LAN disadvantages • QoS: WLANs offer typically lower QoS. Lower bandwidth due to limitations in radio transmission (1-10 Mbit/s) and higher error rates due to interference. • Cost: Ethernet adapter vs. wireless LAN adapters • Proprietary solutions: slow standardization procedures lead to many proprietary solutions only working in an homogeneous environment • Safety and security: using radio waves for data transmission might interfere with other high-tech equipment Conclusion : Conclusion W ireless LAN provide high speed data communication. The minimum data rate specified by the IEEE Project 802.11 is 1Mbps. NCR's wave LAN operates at 2Mbps, while Motorola's ALTAIR operates at 15Mbps. Because of their limited mobility and short transmission range, wireless LANs can be used in confined areas such as a conference room. In the U.S, almost all WLANs products use spread spectrum transmission. Therefore they transmit information on the ISM band. But with this frequency band, users can experience interference from other sources using this band. Slide 25: Thank you….