The physical layer defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between end systems.
物理层定义了在端系统之间为了建立、维持和撤消物理链路所需的电气的、机械的、过程的和功能的特征。
The physical layer defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between end systems.
物理层定义了在端系统之间为了建立、维持和撤消物理链路所需的电气的、机械的、过程的和功能的特征。
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