Osi（open system interconnect），即开放式系统互联。 一般都叫osi参考模型，是iso组织在1985年研究的网络互联模型。 该体系结构标准定义了网络互联的七层框架（物理层、数据链. 计算机osi各层的数据传输单位如下： 物理层：单位是 比特。在物理层，数据还没有被组织，仅作为原始的位流或电气电压进行处理。 数据链路层：传输单元是 帧。数据链路.
Osi Ultipro Maya Ruby
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