Shulou(Shulou.com)06/03 Report--

What this article shares with you is about what is physical layer transmission. The editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article. Let's take a look at it with the editor.

The physical layer transmits a bit stream.

Physical layer

The physical layer (or physical layer, Physical Layer) is the lowest layer in the computer network OSI model.

The physical layer stipulates that:

Provide 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 problems to be solved at the physical layer:

(1) the physical layer should shield the physical equipment and transmission media as much as possible, the different means of communication, so that the data link layer can not feel these differences, and only consider to complete the protocols and services of this layer.

(2) to give its service users (data link layer) the ability to transmit and receive bitstreams (usually serial and sequential bitstreams) on a physical transmission medium, for this reason, the physical layer should solve the problem of establishing, maintaining and releasing physical connections.

(3) uniquely identify the data circuit between two adjacent systems.

The main functions of the physical layer:

Provide data transmission path and data transmission for data terminal equipment.

The above is what is the physical layer transmission, the editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.