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WAN Technologies

WAN Technologies. Lecture 9 Paul Flynn. Objectives. WAN Technologies Overview WAN Technologies WAN Design. WAN Technology. WAN Service Providers. Physical Layer: WANs. WAN Line Types and Bandwidth. WAN Devices. CSU/DSU. Modem Transmission. WAN Standards. Circuit Switching.

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WAN Technologies

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  1. WAN Technologies Lecture 9 Paul Flynn

  2. Objectives • WAN Technologies Overview • WAN Technologies • WAN Design

  3. WAN Technology

  4. WAN Service Providers

  5. Physical Layer: WANs

  6. WAN Line Types and Bandwidth

  7. WAN Devices

  8. CSU/DSU

  9. Modem Transmission

  10. WAN Standards

  11. Circuit Switching

  12. Packet Switching

  13. WAN Link Options

  14. Analog Dialup

  15. ISDN

  16. ISDN

  17. Leased Line • Leased lines are not only used to provide direct point-to-point connections between Enterprise LANS, they can also be used to connect individual branches to a packet switched network.

  18. WAN with X.25 • X.25 provides a low bit rate, shared-variable capacity that may either be switched or permanent

  19. Frame Relay • Most Frame Relay connections are based on PVCs rather than SVCs. It implements no error or flow control. Frame Relay provides permanent shared medium bandwidth connectivity that carries both voice and data traffic.

  20. ATM • Asynchronous Transfer Mode (ATM) is a technology capable of transferring voice, video, and data through private and public networks. It is built on a cell based architecture rather than on a frame-based architecture.

  21. DSL

  22. ADSL Technology

  23. Defining DSL: Digital Subscriber Loop Customer DSL Value-Added Packet Network Copper Loop DSL “Modem” DSL “Modem” • Like dial, cable, wireless, and T1, DSL is a Transmission Technology,NOT a full end-to-end solution • Users don’t “buy” DSL, they “buy” services, such as high-speed Internet, leased line, VPN, and Video on Demand

  24. DSL Modem Technology DSL Service Max. Data Rate Down/Uplink (bps) Line Coding Technology Analog Voice Support Max. Reach (km-feet) VDSL–Very High Bit Rate DSL 25M/1.6M or 8M/8M ??? Yes .9–3,000 Residential SOHO Business ADSL–Asymmetric DSL 8M/1M CAP & DMT 5.5–18,000 Yes IDSL–ISDN DSL 144K/144K 2B1Q No 5.5–18,000 SDSL–Symmetric DSL 768K/768K 2B1Q / CAP No 6.9–22,000 HDSL2– High Bit Rate DSL 1.5M–2.0M/1.5M–2.0M Optis No 4.6–15,000 • Trade-off is Reach vs. Bandwidth • Reach numbers imply “Clean Copper” • Different layer 1 transmission technologies, need a common upper protocol layer to tie them together

  25. Cable Modem • Enhanced Cable Modems enable two-way. High speed data transmissions using the same coaxial lines that transmit cable television.

  26. Modern WAN

  27. Comparing WAN Traffic Types

  28. Star Topology

  29. Full-Mesh Topology

  30. Partial-Mesh Topology

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