Network card classification

- Jul 04, 2019-

The transmission rate can be divided into:

10Mbps network card, 100Mbps network card, 1000Mbps network card, 10GMbps network card. Currently three common architectures are 10baset, 100basetx and base2. The first two are rj-45 twisted pair transmission medium, and the transmission rates are 10Mbps and 100Mbps respectively. The twisted wire is divided into five specifications, category 1 to category 5, which have different uses and bandwidth. The category is usually referred to as cat. As long as the cat5 specification twisted pair can be used for the 10/100 mbps network card, the 10base2 architecture is used. It uses a thin coaxial cable as the transmission medium, and the transmission rate is only 10Mbps. The 10Mbps or 100Mbps mentioned here refers to the maximum transmission rate on the network card, and is not equal to the actual transmission speed on the network. The actual speed should take into account the transmission distance. , the quality of the line, and whether the network is crowded and other factors, the bps mentioned here refers to the bit transmitted per second (1 byte = 8 bits). And 100Mbps is called fast ethernet, more It is a PCI/PCI-E interface. Currently, the pci network card on the market has 10/100/1000Mbps automatic switching function, which automatically adjusts the network speed according to the network connection environment. The 1000 Mbps Ethernet card is mostly used for switches or switches. High speed link or backbone between the server.


According to the interface type can be divided into:

ISA interface network card, PCI/PCI-X/PCI-E interface network card, USB interface network card and notebook PC-specific PCMCIA interface. The current ISA interface network card uses 16bit bus width, its characteristic is programmed i/o mode When transmitting data, you must use the CPU to open a small window on i/o as a communication channel between the network card and the PC. It needs to occupy a high CPU usage rate and is inefficient when transmitting large amounts of data. PCI interface The network card adopts the 32-bit bus bandwidth, and uses the bus master's data transmission mode. The data transmission is controlled by the control chip on the network card. It does not need to pass the i/o port and cpu, which can greatly reduce the CPU usage. Switching network card for 10/100Mbps two-speed automatic detection.


According to the transmission method can be divided into:

Half-duplex network card, full-duplex network card. Half-duplex network card can not complete the action of receiving and transmitting data in the same time. For example, the network architecture of 10base2 using thin coaxial cable is a half-duplex network, which can only be transmitted at the same time or The work of receiving data is inefficient. To use a full-duplex network, you must use a twisted pair as a transmission line, and you must also use a full-duplex hub. You must use a 10base or 100basetx network architecture. Also a full-duplex product.


The transmission medium can be divided into:

Rj-45 twisted pair network card and bnc coaxial cable two, some network cards have two kinds of connectors at the same time, can be applied to two network lines, but not both connectors can be used at the same time. In addition, there are also fiber optic interface network cards, Usually the bandwidth is 1000 Mbps.


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