Where is the laptop network card?

The laptop network card is usually on the right side of the notebook. The way to check the location of the laptop network card is: first turn the computer over and remove the battery; then unscrew all the visible screws on the back cover and Open the back cover; finally you can see the network card on the right side of the computer.

Generally, after disassembling a module that is about the same size as the CPU, use one black and one white The cable connected to it is the network card, usually on the right side of the laptop. (Recommended learning: web front-end video tutorial)

(1) Turn the computer over and remove the battery. All computer batteries are very easy to remove because they are snap-on. Design;

(2) Unscrew all visible screws on the back cover, and then open the back cover;

(3) Most computers can see the wireless network card here (The arrow points to it);

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

Because it has a MAC address, it belongs to Layer 2 of the OSI model. It allows users to connect to each other via cable or wirelessly. Each network card has a unique 48-bit serial number called a MAC address, which is written in a ROM on the card.

Every computer on the network must have a unique MAC address. No two network cards produced have the same address. This is because the Institute of Electrical and Electronics Engineers (IEEE) is responsible for assigning unique MAC addresses to network interface controller (network card) vendors.

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.

Network cards used to be plugged into the computer bus as expansion cards, but due to their low price and the ubiquity of the Ethernet standard, most new computers have integrated network interfaces on the motherboard.

These motherboards either integrate Ethernet functionality into the motherboard chip, or use a cheap network card connected to the motherboard via PCI (or the newer PCI-Express bus). Unless multiple interfaces are required or other types of networks are used, a separate network card is no longer needed. Even newer motherboards may have built-in dual network (Ethernet) connectors.

When installing a network card, the device driver that manages the network card must be installed in the computer's operating system. This driver will later tell the network card where in the memory the data blocks transmitted from the LAN should be stored. The network card must also be able to implement the Ethernet protocol.

The network card is not an independent autonomous unit, because the network card itself does not have a power supply but must use the power supply of the computer it is plugged into and is controlled by the computer. The network card can therefore be viewed as a semi-autonomous unit.

When the network card receives an erroneous frame, it discards the frame without notifying the computer to which it is plugged. When the network card receives a correct frame, it uses an interrupt to notify the computer and deliver it to the network layer in the protocol stack. When the computer wants to send an IP data packet, it is handed down from the protocol stack to the network card, assembled into a frame, and sent to the LAN.

With the continuous improvement of integration, the number of chips on the network card continues to decrease. Although there are many types of network cards produced by various manufacturers, their functions are similar.

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