Slides10 - WAN Network Design David Tipper Graduate...

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1 WAN Network Design David Tipper Graduate Telecommunications and Networking Program University of Pittsburgh Slides 10 Telcom 2110 Network Design WAN Network Design •G i v e n – Node locations (or potential locations) – Traffic Demand (mean, peak, etc) – Performance Goals (blocking rate, delay,etc.) • Determine Topology – Link/node location – Link capacity TELCOM 2110 2 – Traffic Routing
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2 WAN Network Design •Design Variables • Network Topology (possibly facility location as well) • Channel Capacity • Routing Policy •Performance Metrics depends on network application and layer • Circuit Switched Network •Call Blocking, Availability • Packet network Delay TELCOM 2110 3 • Delay • Delay Jitter • Throughput • Packet Loss • Minimize total cost • Subject to Constraints … for example – Link capacity must exceed some min, and be less than some max Basic WAN Network Design – Average Packet Delay must be < maximum – Reliability requirements – Throughput, etc. • General goals – Short path between all sources and destinations. – Wel utilized components with high speed lines to achieve TELCOM 2110 4 – Well-utilized components with high speed lines to achieve economy of scale. – These are somewhat contradictory goals • Some Examples of real WAN network topology
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3 Sprint IP Backbone TELCOM 2110 5 Mostly OC-192 links) Example Time Warner TELCOM 2110 6
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4 Example:Level 3 TELCOM 2110 7 Example: QWest TELCOM 2110 8
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5 Example: QWest TELCOM 2110 9 Fiber Runs Many of the networks use the same fiber runs Fiber runs follow roads, train lines, utility lines, etc. TELCOM 2110 10
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6 Multi-Ring Network British Telecom Backbone TELCOM 2110 11 Ring vs Mesh Architectures Advantages of Rings : More cost efficient at low traffic volumes Fast protection switching, some capacity sharing Advantages of Mesh : More cost efficient at high traffic volumes Facilitates capacity and cost efficient mesh restoration More flexible channel re-configuration Easier to cover large distances TELCOM 2110 13
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7 Wired Network Structure Metro Area 2 Metro Area 1 Backbone Access Feeder Network Trend is mesh Backbones in WAN TELCOM 2110 14 Central Offices Metro Area 3 Metro Area n Core ~ Mesh Metro ~ Ring Access ~ Tree What equipment does a packet encounter across WAN? cust router Access router Core router packet OC-3 ADM ADM ADM OC-48 UPSR OC-3 OC-192 ADM ADM ADM OC-12 OC-12 OC-48 BLSR packet ADM ADM OXC OT WDM WDM OT OT WDM WDM OT OXC 1 2 multi OC-192 OC-192 multi OTS OTS OXC OC-192 2 1 TELCOM 2110 15 ADM SONET Add/Drop Multiplexer UPSR SONET Uni-directional Path Switched Ring BLSR SONET Bi-directional Line Switched Ring OXC Optical Cross-Connect OTS Optical Transport System OT Optical Transponder cust router Access router Core router OC-3 ADM ADM OC-48 UPSR OC-3 OC-12 OC-12 OC-192 ADM ADM OC-48 BLSR
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8 cust router Access router Core router cust router Core router Access router Private Line Svc OC-3 OC-192 OC-3 OC-12 OC-12 IP Svc IP Layer End-end Example Layered ADM ADM ADM ADM ADM ADM ADM ADM ADM
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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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Slides10 - WAN Network Design David Tipper Graduate...

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