Slides6 - Access Network Design David Tipper Associate...

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1 Access Network Design David Tipper Associate Professor Department of Information Science and Telecommunications University of Pittsburgh Slides 6 http://www.sis.pitt.edu/~dtipper/2110.html • Top down network design project approach should follow three phases: – Conceptual Model Top Down Network Design Approach • Objectives, Requirements, Constraints – Logical Model • Technology, network graph, node location, link size, etc. (where algorithms are used to minimize cost) – Physical Model • Specific hardware/software implementations • (e.g., wiring diagram, repeater locations, etc.) Focus on Algorithms for Logical Model Design TELCOM 2110 2 – Graph Theory – Optimization • How to apply these techniques to particular design problems?
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2 Network Design Categories Remember network design classifications Network Design Size Metro Access WAN Wired Wired Wireless . . . . . . . . . . Technology Stage TELCOM 2110 3 VPN . . . . . . . . . . greenfield greenfield incremental Techniques used to design the network will depend on the classification Consider Access Network Design (wired and wireless) for the greenfield case Access, Metro and Long-Haul Transport WAN Long- haul network Access network Access networks connect “small” sites to the WAN/Metro network Access networks are the Access networks are the “ends” and “tails” of networks (last mile networks) often represents most of the total network cost, e.g., telephone network Variety of Technologies: Wireless LANs TELCOM 2110 4 Metro network Source: J. Doucette, Ph.D. Thesis, UofA, 2004 Cellular networks –W i M A X Cable networks Copper Local loop – DSL Fiber to home/curb Power Line Com.
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3 Access Networks WAN/MAN (backbone) – access division of network is used in networks and transportation systems For example, LAN segments connecting to campus backbone • Access network collect traffic from small sites into the high speed backbone network. Sharing high speed links TELCOM 2110 5 Sharing high speed links, enjoy economy of scale benefit. • Need to be able to identify backbone/access hubs Access Network Design • Traffic Matrix – Specifies traffic between all source-destination pairs Entry T is the traffic from source i to destination – Entry T ij is the traffic from source i to destination j – Source and destination maybe host, LAN, etc. – Developed in conceptual design- usually based on peak busy hour • Cost Matrix – Cost of link capacity C ij between nodes i and j TELCOM 2110 6 – Cost may depend on traffic demand w needed C ij (w) • Nodal Weight – The total traffic at a node • sum of all traffic in and out of the node
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4 Nodal Weight Given a set of sites/nodes N i and traffic matrix T, Weight(N i ) = j (T i,j +T j,i ) .
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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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Slides6 - Access Network Design David Tipper Associate...

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