What are the three basic functions of a network card?

The three basic functions of the network card are: 1. Encapsulation and decapsulation of data. When sending, the data passed from the upper layer is added with a header and a tail to become an Ethernet frame; 2. Link management , mainly implemented through the CSMA/CD protocol; 3. Data encoding and decoding, namely Manchester encoding and decoding. Manchester code is one of the commonly used binary code line encoding methods, which is used by the physical layer to encode the clock and data of a synchronous bit stream.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

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

The network card is equipped with a processor and memory (including RAM and ROM). Communication between the network card and the LAN is carried out through serial transmission through cables or twisted pairs. The communication between the network card and the computer is carried out in parallel transmission through the I/O bus on the computer motherboard. Therefore, an important function of the network card is to perform serial/parallel conversion. Since the data rate on the network is not the same as the data rate on the computer bus, a memory chip that caches the data must be installed in the network card.

Main functions

1. Data encapsulation and decapsulation

When sending, add the header and tail to the data passed from the previous layer. Becomes an Ethernet frame. When receiving, the header and tail of the Ethernet frame are stripped off, and then sent to the upper layer

2. Link management

Mainly through CSMA/CD (Carrier Sense Multiple Access with Collision Detection , Carrier Sense Multiple Access with Collision Detection) protocol to implement

3. Data encoding and decoding

is Manchester encoding and decoding. Among them, Manchester code, also known as digital bidirectional code, phase code or phase encoding (PE), is one of the commonly used binary code line encoding methods. It is used by the physical layer to encode the clock and data of a synchronous bit stream. In communications technology, a code used to represent the combination of data and timing signals in the bit stream to be sent. Commonly used in Ethernet communications, train bus control, industrial buses and other fields.

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