实际上，48字节结构是美国电话公司偏爱64字节商务载量和欧洲公司要求每个信元有32字节之间的折衷。

In fact, the 48-byte structure was a compromise between V. S. telephone companies, which favored a 64-byte payload, and their European counterparts, which wanted 32 bytes in each cell.

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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。

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.

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通信协议转换逻辑上行方向的系统分析及体系结构设计，包括上行接收状态机、发送状态机、信元内字节位置调整机制等的设计；

The architecture and logical design of ingress process module, which includes receive control FSM, send control FSM and cell position adjustment logic;

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