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This article mainly introduces what functions the network card has, which can be used for reference by friends who need it. I hope you will learn a lot after reading this article. Next, let the editor take you to learn about it.

The three basic functions of the network card are: 1, the encapsulation and unencapsulation of the data; when sending, the data transmitted from the upper layer is added to the head and tail to become the frame of Ethernet. 2. Link management, mainly through CSMA/CD protocol. 3. Data coding and decoding.

A network card is a piece of computer hardware designed to allow computers to communicate over a computer network.

The network card is equipped with a processor and memory (including RAM and ROM). The communication between the network card and the local area network is carried out by serial transmission through cable or twisted pair. On the other hand, the communication between the network card and the computer is carried out in parallel through the Icano bus on the computer motherboard. Therefore, one of the important functions of the network card is to carry out serial / parallel conversion. Because the data rate on the network is different from that on the computer bus, a memory chip for caching data must be installed in the network card.

Main function

1. Encapsulation and unencapsulation of data

When sending, the data transmitted from the upper layer is added to the head and tail to become the frame of Ethernet. When receiving, the Ethernet frame is stripped of the head and tail, and then sent to the upper layer.

2. Link management

It is mainly realized through CSMA/CD (Carrier Sense Multiple Access with Collision Detection, Carrier sense multiple access with collision Detection) protocol.

3. Data coding and decoding

Manchester coding and decoding. Manchester code, also known as digital bidirectional code, phase separation code or phase coding (PE), is one of the commonly used binary code line coding methods, which is used by the physical layer to encode a synchronous bit stream clock and data. In communications, a code used to represent the combination of data in a bit stream to be transmitted and a timing signal. It is commonly used in Ethernet communication, train bus control, industrial bus and other fields.

Thank you for reading this article carefully. I hope the editor can share what functions and contents of the network card are helpful to everyone. At the same time, I also hope that you can support us, pay attention to the industry information channel, and find out if you encounter problems. Detailed solutions are waiting for you to learn!

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