How to even out -network card

26 July 2011

Network card is the abbreviation of network interface card, is the local area network connection of one of the most important equipment, computer through the nets card access network.

In computer networks, the network card on one hand on the network to receive packets, solution after the bag, data through the motherboard bus transfers to local computer, on the other hand, the data on the local computer pack into network after. The network card in the computer has now become the standard configuration of one.

Small card, actually contains many secret? Let the door to watch. We are the most commonly used network equipment of network card when……. LAN (local area network card itself is network) equipment, through the gateway, routers equipment can hook up to the Internet this LAN, and the Internet itself is by innumerable such composed of local area network. In the local area network, the network card used for computer signals between the input and output, up to role on. When using the network card in the computer, put the expansion slots, according to support expansion slot form the main isa card, eisa card and apple MAC machine with ethercard, etc. Currently used more 16 isa card and 32 bit pci card.

Nic have their own interrupt and the I/O address, and their own cache, in order to store data. The network Lenovo U550 battery card, it will be said his job is normal or not.

The support of the network transmission rate is different, some for 10 MBPS per second, others for 100 MBPS per second. With 100 MBPS Ethernet technology popularization, the most current nets card has a 10 MBPS and 100 MBPS adaptive work model.

With remote start chip card, can be used in no disk workstation. No disk stand, no hard drive for work, can be no floppy disk. Through the nic starts computer, can protect the safety of the card system, avoid the virus. Additional, still can reduce cost.

In the notebook computer, the use of dexterity pcmcia card, used to exchange data with other computers, of course, make the notebook computer motherboard with a network card is the technology of the circuit, the mainstream.

Each card in a factory, are assigned a global addresses only logo, the logo was called network address, also known as the MAC address, physical address or hardware address. Network card by 48 bits of length address of a binary number. Among them, the first 24 bits said in after manufacturer, born for 24 bits assigned products manufacturer of serial number. If you use a hexadecimal number 12, says the six months hexadecimal number after manufacturers, said six hexadecimal number says the network card manufacturers the serial number of the product. Such as nic address-90- 99-27 11-CC:, which first six hex says the network card company production, by the corresponding intel-based network card serial number for 99-11-CC:. Network card is mainly used for the physical address equipment, and addressing behind this IP address is logical addressing role has cut the difference between very different.

There are many kinds of network card, according to the data link layer control to points have Ethernet card, token ring network card, ATM card, etc.; According to the physical layer to classification have wireless card, RJ-45 nets card, coaxial cable network card, light network card and so on. Their data link control, addressing, frame structure and so on the different; The physical connection of different ways, data coding, signal transmission medium, electricity equality is different.

The following main introduced us to the most common Ethernet network adapter. Ethernet using csma/CD (carrier protected reliably against detective multi-channel access] collision detection) control technology. He mainly defines the physical layer and the data link layer way of working. The data link layer and the physical realization of his function, since each other don’t care about each other how to operate. Between the two has a standard interface to transfer data and control.

Ethernet card of the physical layer can contain PA3450U-1BRS battery very DuoZhong technology, common are RJ45, light line, wireless, etc, the difference lies in the transmitting signals physical media and different medium. These are the 802 agreement in IEEE clan have detailed definition. This time we discussed the network card IEEE802.3 RJ45 belongs to the scope of the definition.

A piece of Ethernet network card (including the osi model’s system interconnection) two layers. The physical layer and the data link layer. The physical layer defines data to transmit and receive need electricity and optical signals, line state, clock benchmark, data coding and circuit, etc, and to the data link layer equipment to provide standard interface. The data link layer provides addressing institutions, data frame construction, and data error check, transmission control, to the network layer provides standard data by mouth etc. Function.

Ethernet card of the data link layer of the chip general Jane called MAC controller, the physical layer of the chip we Jane called phy. Many of the network card chip MAC and phy function did a chip, for example intel82559 nic and 3 com 3 C905 network adapter. But the MAC and phy mechanism or exist alone, just outside of the concept of the form is a single chip. Of course there is a lot of card MAC and phy do, such as separate d-link’s DFE-530 TX, etc.

Realize the data sending and receiving, frame encapsulation and unpacking, coding and decoding, medium access control etc. Function. The function of the physical layer of the OSI covered with the data link layer, so usually will network card to the data link layer of the equipment.

How to detect the network card in his machines? To windowsXP system for example:

Open the “control panel” of the “performance and maintenance”; Choose “check your basic computer information”, select “hardware”.

Click “device manager”, here is on your machine, all the hardware information

We have to check the information network, click Apple A1185 battery on the “network adapter,”

We can see that our network card is normal work, if the network card in the problem, and check the machine before see the work is normal or not, again another job.

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How to even out -network card

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