At present, according to the transmission speed of the network card, it can be divided into 10M, 10 / 100M adaptive network card and Gigabit (1000M). If only as a general purpose, such as daily office, more suitable for the use of 10M card and 10 / 100M adaptive network card two. If applied to the server and other products, we have to choose a gigabit network card. When it comes to the network card, the way to talk about the connection with the network card.

Twisted pair, which is composed of a number of wires in a wire transmission line, which is characterized by cheap, now most of the network card is used as the transmission cable. Double stranded wire is generally used for star network cabling connection, both ends of the installation of RJ45 head (crystal head), RJ45 with a transformer connected to the hub, the maximum cable length is about 100 meters.

Double stranded STP (shielded twisted pair) and UTP (non shielded twisted pair) two. STP twisted pair in a layer of metal film, the data transmission can reduce electromagnetic interference, so it has a higher stability. While the metal film is not in the UTP, so its stability is poor, but its advantage is that the price is cheap. The STP (STP) is mainly divided into 3 categories and 5 types of two lines, UTP (UTP) consists of 3 /4 class /5 class / Super 5 /6 class several, mainly use the general network is 5 UTP, category 5 twisted pair thick outer protective rubber, rubber marked "CAT5". Over 5 kinds of twisted pair are non shielded twisted pair, with the ordinary 5 kinds of twisted pair, over 5 kinds of twisted pair in the transmission of signal attenuation is smaller, the ability to resist interference, in the 100M network, the user equipment is only 5 kinds of 1/4, which is also the mainstream of the current application.

RJ45 is the common interface of the network card, the computer interface, which also caused the network card used by the bus interface type. In addition, referred to the bus interface, the need to explain is that people will generally be this kind of interface commonly known as "golden finger", why is it called? Because this kind of molding is used Dutai gold card (or other metal), to ensure the reliable contact plug when repeated, not only increase its anti-interference ability and reduce the interference to other equipments.

Common types of interfaces are: ISA interface, PCI interface, PCI-X interface, PCI-E interface card. Express 1X PCI interface has become the mainstream of the main board interface. Different and parallel transmission, Express PCI interface uses point-to-point serial connection mode, Express PCI interface according to the bus interface of the requirements of different and different, divided into Express 1X PCI (standard 250MB/s, two-way 500MB/s), 2X (standard 500MB/s), 4X (1GB/s), 8X (2GB/s), 16X (4GB/s), 32X (8GB/s). The use of PCI-E interface card for Gigabit Ethernet