Different functions of different ATM layers

OSI Layer	ATM Layer	ATM Subnet	Sunctionality
3/4	AAL	CS	Providing the standard interface(Convergence).
2/3	ATM		Flow Control cell header generation/extraction virtual circuit/path management cell multiplexing/demultiplexing.
2		TC	Cell rate decoupling header checksum generation & verification cell generation packing/unpacking cells from the enclosing envelope frame generation.
1	Physical.	PMD	Bit timing physical network access.

CS = Convergence sublayer

SAR = Segmentation and reassembly sublayer

TC = Transmission Convergence sublayer

PMD = Physical medium dependent sublayer

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