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 ...