Since the MAC Service is provided at an abstract interface within an end station, it is not possible to specify the total frame transit delay precisely.
由于MAC服务在一台终端工作站内以抽象接口的方式提供，因此它不可能指定合适的总数据包传输延时。
In analysis, we establish a packet service model and obtain the distribution of frame internal, and discussed the relation between packet delay and frame efficiency.
建立了包业务模型，得到成帧间隔的概率分布，并讨论了包延时与帧效率的问题。
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