Physical Layers
TC => transmission convergence sublayer
- generates and receives frames, packs cells into frames, computes ATM header CRC, ie HEC, and inserts in each cell, on receipt checks HEC for each cell, discards if error, bit scrambling to avoid SONET framing pattern, ...
- based on SONET or DS3 or ???
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PMD => physical medium dependant sublayer
- bit transfer between two nodes, wave shapes, timing recovery, line coding, ...
- ATM independant of this layer