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This article mainly introduces the main functions of the physical layer, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

The physical layer provides a physical connection for the upper layer to transmit the original bit stream. The physical layer provides transmission media and interconnection devices for data communication between devices, and provides a reliable environment for data transmission. In order to give the data link layer the ability to transmit and receive bitstreams on a physical transmission medium, the physical layer needs to solve the problem of establishing, maintaining and releasing physical connections.

The physical layer provides a physical connection for the upper layer to transmit the original bit stream.

Both the server and the client can be understood as a point, and the connection established through the line between the points is called the physical connection.

The physical layer (or physical layer, Physical Layer) is the lowest layer in the computer network OSI model. The physical layer provides mechanical, electronic, functional and normative characteristics for the creation, maintenance, and dismantling of physical links needed to transmit data. Simply put, the physical layer ensures that the original data can be transmitted over a variety of physical media. Both local area network and wide area network belong to layers 1 and 2.

The physical layer is the first layer of OSI. Although it is at the bottom, it is the foundation of the whole open system. The physical layer provides transmission media and interconnection devices for data communication between devices, and provides a reliable environment for data transmission. If you want to remember this first layer with as few words as possible, it is "signals and media".

The main function of the physical layer is to provide data transmission path and data transmission for data-side equipment.

1. It provides a data transmission path for data-side devices, which can be a physical media or a plurality of physical media. A complete data transfer, including activating a physical connection, transferring data, and terminating a physical connection. The so-called activation means that no matter how many physical media are involved, it is necessary to connect the two data terminal devices to form a path.

two。 To transfer data, the physical layer should form an entity suitable for the needs of data transmission to serve the data transmission. One is to ensure that the data can pass through it correctly, and the other is to provide sufficient bandwidth (bandwidth is the number of bits (BIT) that can pass per second) to reduce congestion on the channel. The mode of data transmission can meet the needs of point-to-point, point-to-multipoint, serial or parallel, half-duplex or full-duplex, synchronous or asynchronous transmission.

3. Complete some management work of the physical layer.

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