Slajd PPT
*** AAL 1 - Constant Bit Rate Services.
*** AAL 2 - Variable Bit Rate Services.
*** AAL 3 - Connection Orientated VBR Data Transfer.
*** AAL 4 - Connection less VBR Data Transfer.
*** AAL 5 - (SEAL) Simple & Efficient Adaptation Layer
An improvement on "3" not defined by ITU.