Page "Asynchronous Transfer Mode" Paragraph 12
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ATM supports different types of services via ATM adaptation layers ( AAL ).
Standardized AALs include AAL1, AAL2, and AAL5, and the rarely used AAL3 and AAL4.
AAL1 is used for constant bit rate ( CBR ) services and circuit emulation.
Synchronization is also maintained at AAL1.
AAL2 through AAL4 are used for variable bit rate ( VBR ) services, and AAL5 for data.
Which AAL is in use for a given cell is not encoded in the cell.
Instead, it is negotiated by or configured at the endpoints on a per-virtual-connection basis.
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