se-410: wireless lans & mans time table lectures: tuesday: 4.30 to 6.30 pm (seb-1200) friday:...
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SE-410: Wireless LANs & MANs Time Table
Lectures:Tuesday: 4.30 to 6.30 PM (SEB-1200)Friday : 1.30 to 2.30 PM (SEB-2099)Laboratory:Monday : 12.30 to 2.30 PM (SEB-1011)
ORThursday: 8.30 to 10.30 AM (SEB-1011)
SE-410: Wireless LANs & MANs
Prerequisites:SE-312 and SE-314
Text Book:“Wireless Communications & Networks”by William Stallings, PHI, ISBN:0-13-191835-4, 2002
SE-410: Wireless LANs & MANs
References:1) “Wireless & Mobile Systems” by D.P.Agarwal & Q.Zeng, Thomson Books/Cole, ISBN: 0-534-40851-62) “Principles of Wireless Netowrks” by K.Pahlavan & P.Krishnamurthy, PHI, ISBN: 0-13-093003-23) Course Notes by R.K.Rao
SE-410: Wireless LANs & MANs Evaluation
Assignments : 15%Laboratory : 15%Project & Presentation: 20%Final Exam : 50%
Score 50% in each of the 4 Components to PASS the course
SE-410: Wireless LANs & MANs Course Websitewww.engga.uwo.ca/people/rrao/courses.html Submission Policy
All submissions due by 12.00 Noon on due date
Locker for the CourseLocker # 225, Thompson Engineering Bldg.
SE-410: Wireless LANs & MANs
Any Questions? Office Hours for the Course?
Introduction
Wireless Comes of Age Marconi invented the wireless telegraph in 1896
Communication by encoding alphanumeric characters in analog signal
Sent telegraphic signals across the Atlantic Ocean Communications satellites launched in 1960s Advances in wireless technology
Radio, television, mobile telephone, communication satellites
More recently Satellite communications, wireless networking, cellular
technology
Wireless Comes of Age (cont.) Communication Satellites were
introduced in the 1960s Wireless Networking is allowing
businesses to develop LANs and MANs Cellular or Mobile telephone is the
modern equivalent of Marconi’s wireless
Wireless Communications is responsible for “shrinking” the world
The Cellular Revolution Number of users in 1990-11 million Number of users in 2004->1billion In 2005 number of wireless
Internet devices exceeded the number of wired Internet devices
All these point to the success of Wireless
Broadband Wireless Technology Higher data rates obtainable with broadband
wireless technology Graphics, video, audio
Shares same advantages of all wireless services: convenience and reduced cost Service can be deployed faster than fixed service No cost of cable plant Service is mobile, deployed almost anywhere
Limitations and Difficulties of Wireless Technologies Wireless is convenient and less expensive Limitations and political and technical difficulties
inhibit wireless technologies Lack of an industry-wide standard Device limitations
E.g., small LCD on a mobile telephone can only display a few lines of text
E.g., browsers of most mobile wireless devices use wireless markup language (WML) instead of HTML
Home in the Range?
Wireless LANs Rapidly evolving technology Connectivity no longer implies
attachment Freedom to roam while still
maintaining connectivity WLANs use infrared light (IR) or
radio frequency (RF) as transmission media
Wireless LANs RF is more popular because of its
long range, higher bandwidth, and wider coverage
Use 2.4 and 5 GHz frequency bands Current Ethernet LANs operate at
speeds of 100Mbps (access layer), 1Gbps (distribution layer), and 10 Gbps (core layer)
WLANs operate at 11 to 54 Mbps
ISM Unlicensed Frequency Bands
Wireless Devices
Wireless LAN Antennas
Current Standards – a, b, g
802.11a Up to 54 Mbps 5 GHz Not compatible with either 802.11b or 802.11g
802.11b Up to 11 Mbps 2.4 GHz
802.11g Up to 54 Mbps 2.4 GHz
860 Kbps
900 MHz
1 and 2 Mbps
2.4 GHz
Proprietary
802.11 Ratified
802.11a,b Ratified1986 1988 1990 1992 1994 1996 1998 2000 2003
1 and 2 Mbps
2.4 GHz
11 Mbps 54 Mbps
Standards-based
5 GHzRadio
Network
Speed
IEEE 802.11Begins Drafting
802.11g is backwards compatible with 802.11b, but with a drawback (later)
802.11g
Ratified
More later!
Atmosphere: the wireless medium
Wireless signals are electromagnetic waves No physical medium is necessary The ability of radio waves to pass through walls and cover great distances makes wireless a versatile way to build a network.
Wireless LAN growth
Momentum is Building in Wireless LANs Wireless LANs are an “addictive” technology
Strong commitment to Wireless LANs by technology heavy-weights Cisco, IBM, Intel, Microsoft
Embedded market is growing Laptop PC’s with “wireless inside” PDA’s are next
The WLAN market is expanding from Industry-Specific Applications, to Universities, Homes, & Offices
Professional installers and technicians will be in demand
Wireless LANs Are Taking Off
Future Growth Due To:
StandardsHigh Bandwidth NeedsLow CostEmbedded in LaptopsVariety of DevicesVoice + DataMultiple ApplicationsSecurity Issues SolvedEase of DeploymentNetwork Mgmt. ToolsEnterprise Adoption
Wireless LANs & MANs Be careful not to assume that
wireless is just like any other form of networking
Wireless LANs & MANs are a field of study all their own
If you are new to Networking, be sure to have a basic understanding of networking concepts
Applications of Wireless LAN(Access Role)
Applications of Wireless LAN(Bldg-to-Bldg Connectivity)
Applications of Wireless LAN(Last Mile Service)
Applications of Wireless LAN(Mobility)
Applications of Wireless LAN(SOHO)
Applications of Wireless LAN(School with Mobile
Classrooms)