What is a crab card network card?

Network adapters are also called network cards or network interface cards. A network card is a kind of computer hardware designed to allow computers to communicate on the computer network. It enables users to communicate with each other by wired or wireless means.

The crab card network card is a realtek network card. The icon looks like a crab, so it is called a crab card network card. Each network card has a unique 48-bit serial number called MAC address, which is written in the ROM on the card. The network card is equipped with a processor and memory (including RAM and ROM). The communication between network card and LAN is realized by serial transmission of cable or twisted pair.

Network card selection guide

1, network type

There are Ethernet, token ring network, FDDI network, etc., and the corresponding network card should be selected according to the network type.

2. Transmission rate

The transmission rate of the network card should be selected according to the bandwidth requirements of the server or workstation and the maximum transmission rate provided by the physical transmission medium. Take Ethernet as an example, there are 10Mbps,1100 Mbps, 1000Mbps or even 10Gbps, but the higher the rate, the better. For example, it is a waste to configure a 1000M network card for a twisted-pair computer with a transmission speed of only1000 m, because it can only achieve a transmission speed of1000 m at most.

3. Bus type

Common bus slot types in computers are ISA, e ISA, VESA, PCI and PCMCIA. Intelligent network cards with PCI or EISA bus are usually used in servers, ordinary network cards with PCI or ISA bus are used in workstations, network cards with PCMCIA bus or portable network cards with parallel interfaces are used in notebook computers. PC basically doesn't support ISA connection, so when you buy a network card for your PC, don't buy the old ISA network card, but buy a PCI network card.

4. Cable interface supported by network card

The network card is ultimately connected to the network, so there must be an interface through which the network cable is connected to other computer network devices. Different network interfaces are suitable for different network types. Common interfaces mainly include RJ-45 interface of Ethernet, BNC interface of thin coaxial cable, AUI interface of thick coaxial cable, FDDI interface and ATM interface. In addition, some network cards provide two or more types of interfaces so as to be suitable for a wider range of application environments. For example, some network cards will provide RJ-45, BNC interface or AUI interface at the same time.