The demand for higher transmission capacity and higher bandwidth to the user by multiservice and multimedia application , has put asynchronous transfer mode ( atm ) based on architectures at the forefront of several competing switch technologies Atm ( asynchronoustransformmode ) ? ?异步传输模式网络技术,是当前宽带网络(如adsl 、 vdsl等)的核心技术,自1994年以来已从实验室研究大量走向实际应用。