adaptation layer

The paper discusses the data structure and interface primitive and processing of protocol adaptation layer. It also discusses call processing of system.

具体对协议适配层的数据结构、实现呼叫的接口原语、处理流程，系统的呼叫处理流程进行了讨论。

Based on the deficiency of current implementation of adaptation layer for network protocol test system, a new approach base on object-oriented methodology was proposed.

分析了现有网络协议测试系统中适配层实现方式的不足，提出了面向对象的解决方案。

The purpose of the ATM adaptation layer (AAL) is to receive the data from the various sources or applications and convert or adapt it to 48-byte segments that will fit into the payload of an ATM cell.

ATM适应层（AAL）的作用就是从不同的来源或者应用接收数据并转换或改写成能放入一个ATM信元的有效载荷的长度为48字节的段。