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Data Transmission Rates

Data Transmission Rates

• A number of transmission rates are defined/possible:
  • STS-1, STS-3, STS-9, STS-12, STS-18, STS-24, STS-36, STS-48

  • STM-1, STM-3, STM-6, STM-8, STM-12, STM-16

• Only 3 hierarchical levels are defined in the standard and are commercially available

Optical Rates - SONET

• SONET STS-n frames are mapped onto OC-n - OC stands for Optical Carrier

• STS-1 maps onto OC-1 and so on

• SONET rates are often given by OC-n

• Multiple STS-1 frames are interleaved and converted to optical signals