In this paper , we first introduce the developing background > net architecture and protocol reference model of the wireless atm , especially the theory of aal2 . in order to represent the advantage of aal2 , we compare it with aal1 論文首先介紹了無線atm的發展背景、網絡結構及其協議參考模型,著重對其中的二類適配( aal2 )原理進行了論述,并與一類適配( aal1 )相比較,來說明其優勢。