ATM Physical Layer

Physical Medium Dependent (PMD) sublayer

• SONET/SDH: transmission frame structure (like a container carrying bits);

  • bit synchronization;
  • bandwidth partitions (TDM);
  • several speeds: OC1 = 51.84 Mbps; OC3 = 155.52 Mbps; OC12 = 622.08 Mbps

• TI/T3: transmission frame structure (old telephone hierarchy): 1.5 Mbps/ 45 Mbps

• unstructured: just cells (busy/idle)

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