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Cisco Self-Study: Building Cisco Metro Optical Networks (METRO) by Dennis Hartmann, Dave Warren

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Chapter 9. Packet over SONET

This chapter covers the following topics:

  • Evolution of voice and data networks

  • Packet over SONET applications

  • Packet over SONET operation and specification

  • Packet over SONET efficiencies

  • Packet over SONET network designs

  • Packet over SONET protection schemes

SONET is a time-division multiplexing (TDM) architecture that was designed to carry voice traffic. All traffic in SONET is broken down into slots of 64-kbps DS0 increments. A DS0 is the voice line that is typically hard-wired into homes. TDM architectures are not ideal solutions for transporting data. Cable and DSL providers have shown this with their high-data-throughput broadband offerings that do not incur the same costs as comparable TDM services would incur.

When it ...

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