本文介绍了OSI模型中的物理层（PHY）概念及其作用。PHY连接链路层设备（如MAC）与物理介质（如光纤或铜缆），并包括PCS和PMD两层。PCS负责数据的编码与解码，目的是使接收端更容易恢复信号。
PHY is a common abbreviation for the physical layer of the OSI model .
A PHY connects a link layer device (often called a MAC) to a physical medium such as an optical fibre or copper cable. A PHY typically includes a PCS and a PMD layer. The PCS encodes and decodes the data that is transmitted and received. The purpose of the encoding is to make it easier for the receiver to recover the signal.
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