Slides7 - Wireless Technology in Access Networks David...

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Wireless Technology in Access Networks David Tipper Associate Professor Graduate Telecommunications and Networking Program University of Pittsburgh Slides 7 Network Design Categories Remember network design classifications Network Design Size Metro Access WAN Wired Wired Wireless . . . . . . . . . . Technology Stage Telcom 2110 2 VPN . . . . . . . . . . greenfield greenfield incremental Techniques used to design the network will depend on the classification Consider Access Network Design wireless for the greenfield case
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Wireless in Access Networks • Increasing use of wireless technology in access networks – IEEE 802.11 technology for Wireless LANS and last mile and wireless mesh networks – IEEE 802.16 WiMAX for MANs and last mile – 3G Cellular Technology for mobile telephony – Free Space Optical for short line of sight high bandwidth connections – Microwave for point-to-point longer distance line of sight – high bandwidth connections – Proprietary solutions for wireless multi-hop mesh networks (based on 802.11 or WiMAX) Telcom 2110 3 – Variety of Speeds, Cost, Coverage Range, etc. Why Wireless in Access Networks? Two Applications 1. Cable Replacement Cheaper than wiring Example: Point to Point Microwave Link 2. Last Hop Connectivity Link between end user/host and network is wireless – usually shared by multiple users Normally thought of as wireless Telcom 2110 4 Normally thought of as wireless access network (Example: WLAN, cellular network) Provide user Mobility Cost Advantages Flexibility – ease of deployment
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Wireless Issues Wireless link implications communications channel is the air • poor quality: fading, shadowing, weather, etc. Spectrum regulated by governments • frequency allocated, licensed vs. unlicensed, etc. limited bandwidth • Low bit rate, frequency planning and reuse, interference power issues • Power levels regulated (safety issues), conserve mobile Telcom 2110 5 terminal battery life security issues • wireless channel is a broadcast medium! • Signal easy to intercept Wireless for Cable Replacement • Cable Replacement – Essentially using wireless link in a point-to-point fashion. – Typically used when too expensive to use wired cables • Cross a river, highway, valley, etc. – Basically just another technology option in standard access network design Router 2 1 Telcom 2110 6 3 45 6
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Cable Replacement • Wireless Link Issues – Distance – Line of Sight vs. Non-Line of Sight – Atmospheric Effects – Security –C o s t – Spectrum: Licensed vs. Unlicensed – Layer 2 interface In general a lower quality link Telcom 2110 7 In general a lower quality link then wired – Higher Bit Error Rate – Lower Availability user higher bandwidth then needed!
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This note was uploaded on 09/28/2010 for the course SIS TELCOM 21 taught by Professor D>tipper during the Spring '10 term at Pittsburgh.

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Slides7 - Wireless Technology in Access Networks David...

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