文件名称：数据流层的作用-OSI七层模型
文件大小：1.96MB
文件格式：PPT
更新时间：2024-05-13 19:39:29
OSI
数据流层的作用 EIA/TIA-232 V.35 例子 物理层 设备间接收或发送比特流 说明电压、线速和线缆等 Slide 1 of 5 Purpose: This figure orients the students to the physical layer of the OSI Model. Emphasize: The physical layer specifies the electrical, mechanical procedural, and functional requirements for activating, maintaining, and deactivating the physical link between systems. Certain physical standards are associated with certain data link standards. For example, 802.3 is used with data link standard 802.2 for Ethernet. It is not used in WAN connections. This is covered more in-depth later in the course. Transition: The following discusses Layer 2, the Data Link layer, of the OSI reference model.