Lecture 17

Lecture 17 - EE 555 Broadband Network Architectures Spring...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
EE 555 Broadband Network Architectures Spring 2009, Prof. John Silvester Access Network Technologies Wireless Options in the Local Loop Dial-up •I S D N •D S L Cable Fiber (FTTx) • Wireless LAN’s • Wide Area Wireless • Cellular • WIMAX usc-den-ee555-spring-2009 - Access Network Technologies 2
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Wireless LAN’s usc-den-ee555-spring-2009 - Access Network Technologies 3 Overview of Wireless LANs • use wireless transmission medium use wireless transmission medium • issues of high prices, low data rates, occupational safety concerns, & licensing occupational safety concerns, & licensing requirements now addressed • key application areas key application areas: – LAN extension – cross-building interconnect – nomadic access – ad hoc networking usc-den-ee555-spring-2009 - Access Network Technologies 4
Background image of page 2
Single Cell LAN Extension usc-den-ee555-spring-2009 - Access Network Technologies 5 Multi Cell LAN Extension usc-den-ee555-spring-2009 - Access Network Technologies 6
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cross-Building Interconnec Cross Building Interconnect • poin -to-point wireless link point to point wireless link – Not a LAN per se connec LANs in nearby buildings • connect LANs in nearby buildings • connect bridges or routers usc-den-ee555-spring-2009 - Access Network Technologies 7 Nomadic Access • link LAN hub & mobile data terminal link LAN hub & mobile data terminal – laptop or notepad computer enable employee to transfer data from – enable employee to transfer data from portable computer to server also useful in extended environment such • also useful in extended environment such as campus or cluster of buildings – users move around with portable computers – may wish access to servers on wired LAN usc-den-ee555-spring-2009 - Access Network Technologies 8
Background image of page 4
Infrastructure Wireless LAN usc-den-ee555-spring-2009 - Access Network Technologies 9 Ad Hoc Networking •temporary peer-to-peer network usc-den-ee555-spring-2009 - Access Network Technologies 10
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Wireless LAN Requirements • throughput - efficient use wireless medium • no of nodes - hundreds of nodes across multiple cells • connection to backbone LAN - using control modules •s e r v ice area - 100 to 300 m • low power consumption - for long battery life on mobiles transmission robustness and security • collocated network operation • license-free operation • handoff/roaming • dynamic configuration - addition, deletion, and relocation of end systems without disruption to users usc-den-ee555-spring-2009 - Access Network Technologies 11 Technology • infrared (IR) LANs – individual cell of IR LAN limited to single room – IR light does not penetrate opaque walls • spread spectrum LANs – mostly operate in ISM (industrial, scientific, and medical) bands – no Federal Communications Commission (FCC) licensing is required in USA • narrowband microwave – microwave frequencies but not use spread spectrum some require FCC licensing – some require FCC licensing usc-den-ee555-spring-2009 - Access Network Technologies 12
Background image of page 6
Infrared LANs
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 23

Lecture 17 - EE 555 Broadband Network Architectures Spring...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online