ATM Physical Layer (more)

Two pieces (sublayers) of physical layer:

• Transmission Convergence Sublayer (TCS): adapts ATM layer above to PMD sublayer below

• Physical Medium Dependent: depends on physical medium being used

TCS Functions:

• Header checksum generation: 8 bits CRC
• Cell delineation
• With “unstructured” PMD sublayer, transmission of idle cells when no data cells to send

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