How to choose a notebook built-in wireless network card

How to buy a notebook built-in wireless network card?

Wireless LANs are also known as WLANs. WLAN is the use of wireless technology in the air transmission data, voice and video signals. Its main purpose is to solve a small range of wiring problems and a new scheme. Say simple is from Adsl,lan and so on a variety of broadband access to the computer we use to achieve wireless transmission, it and we are familiar with CDMA and GPRS are two completely different ways of accessing the Internet (CDMA and GPRS belong to the wireless WAN, the equivalent of mobile Internet, need to use the mobile phone network, According to the flowmeter fee, all the wireless network cards sold by this store belong to Wireless LAN.

What form (interface) Do I need for the wireless network card?

At present, the more popular wireless network card by type is as follows: USB interface, PCI interface, PCMCIA (PCM) interface, EXPRESS card interface, mini PCI interface, mini Pci-express interface.

USB interface is the most common, almost all of the current use of the machine, but the disadvantage is inserted in the machine will be more than one, and in case of encounter, it is easy to fall off, and some of the USB network card on the power requirements are relatively high, some USB power supply of the motherboard may not use The advantage is to support hot plug, temporary use convenient, can be removed when not available.

PCI interface is mainly used on the desktop, not too many compatibility issues, installation is also very simple, is the desktop's main wireless solution. belong to the built-in network card, the disadvantage is that the signal is easily blocked by the chassis itself, resulting in a more obvious direction of signal delivery, and the chassis is generally placed in the corner.

PCMCIA Interface (PCM) mainly in the early notebook is more common, like the USB interface, the use is also a section of the outside of the notebook exposed. Suitable for occasional use of wireless networks.

Express Card interface is a PCMCIA interface of the replacement interface, currently mainly used in the support of Express bus notebook, its external openings are the same size as the PCMCIA interface, internal slots only PCMCIA interface length half, so the use of very easy to cause a miscarriage of error.

The Mini PCI interface is the most common built-in interface in the notebook, which is essentially a scaled-down version of the PCI interface, which is very rich in the type of network card. The main advantage is that the network card inside the notebook, easy to use and safe, not in need of use when not found. The disadvantage is that you need to reserve the antenna notebook, otherwise wiring is very troublesome. Is the most popular wireless solution at the moment.

Mini Pci-express interface is a mini PCI interface, mainly in the Express Bus support notebook (dual-core CPU support), and the Mini PCI interface has similar advantages and disadvantages, but most of the Mini with the Pci-express interface notebooks are reserved antenna, general with the mini Pci-express interface notebook does not have a mini PCI interface, so choose to pay attention to.

What speed do I need for the wireless card?

Currently available on the market can buy wireless card has the following speed, respectively, corresponding to their respective protocols: 11Mbps (802.11B), 22Mbps (802.11 Super B), 54Mbps (802.11g/802.11a), 108Mbps (802.11 Super G), 125Mbps (802.11 high Speed-g), 300Mbps (802.11n).

11Mbps (802.11B) is the slowest of all wireless and, of course, the most popular wireless protocol, supported by almost all wireless routers and wireless cards. This protocol is included in most network adapters with 802.11G protocols. Unless you really do not need a faster wireless speed, it is not recommended to purchase a single this Protocol network card.

22Mbps (802.11 Super B) is a strengthened version of the 11Mbps (802.11b) protocol, which requires both the router and the network card to support the protocol to achieve this speed.

54Mbps (802.11g) is currently the most mainstream wireless protocol, but also our most recommended wireless protocol, with a higher than 802.11B speed and better penetration. It is recommended that all friends who purchase the wireless card should buy the network card with this protocol. (General support for G network devices are supported at the same time 802.11B)

54Mbps (802.11a) is almost the first popular wireless protocol, using the same frequency band as 802.11g, but is less supported by routers, is now in a more embarrassing situation, but by some of the earlier wireless networks can only use the 802.11A protocol. In addition to special requirements, there can be no such thing as the existence of this agreement.

108Mbps (802.11 Super G) with 125Mbps (802.11 high speed-g) Both backward-compatible 802.11G, but respectively by Athero and Broadcom company advocated, because the two companies in a state of opposition, and seems to be evenly balanced, so the two protocols in the near future can not appear in a router or wireless network card, so this gives a lot of resistance to the promotion of this Protocol. At the same time, although both protocols define a theoretical bandwidth of twice times or twice times higher than 802.11G, the actual application is far from being up to twice times the speed of ascension. At the same time the signal is very vulnerable to interference and so on, so the necessity of its application. Unless the protocol is uniformly used by all terminals in a wireless local area, there will be only 54Mbps to be reached. This protocol is recommended only as an additional function to buy, there is use, no ease of use 54Mbps.

300Mbps (802.11n), the early-propagating long process, which was once called the MIMO network protocol, has the characteristics of fast speed and strong penetrating force. But the popularity of the road is long, and because the standard has just been determined soon, and the market there are a large number of standards to determine the production of MIMO devices before, they may only partially support the N agreement, so to buy also caused by the relatively large difficulties. Suitable for DIY players and the use of high speed requirements for the operation of the occasion.

What brand of wireless card do I need?

Intel is the first to initiate wireless LAN companies, its most famous is the Centrino platform, its own wireless modules are all Intel's own production, in the hearts of users have a very high reputation. For the missing wireless module of the quasi-Centrino notebook, you can only select the Intel wireless module to appear centrino boot logo. General Intel is the most expensive of all network adapters, but because of its excellent compatibility with Intel notebooks, it is recommended that most of the conditions allow customers to choose to vote for Intel's network card.

Atheros Ltd.

Broadcom Ltd.

TI Texas Instruments

About the signal.

About the wireless network signal problem Some instructions: 1 wireless network communication process, whether it is a network card to send a signal to the route, or routing send a signal to the network card, the process is a signal through the antenna, and then the other side of the antenna to accept the process. It is known from physical characteristics that when a network card or route accepts a wireless signal, the larger the area of the antenna (quantified as db or gain), the stronger the signal received, or the larger the antenna area, the farther it can receive the signal from the other side, and the antenna area of the transmitter is basically irrelevant. So there's going to be a problem, if the antenna area of the router is very large (high gain antenna), and the network card antenna is very small (such as USB network card), it will appear the network card received a weak signal route (performance for slow network), the route received a strong signal network card (fast speed). 2 for any wireless network card, its data communications are two-way, that is, wireless network card to the wireless router or AP data, while the wireless router or AP to the wireless network card to send data. And the characteristics of our common TCP/IP protocol determines whether the router and the network card in any direction, each transmission of "data Packet" (a packet capacity equivalent to a number of letters in the letter, so the time to send files, is to cut the file into countless packets, one by one, sent, That is, to confirm that the previous packet was received before sending the next packet. Routers and network cards are a two-way communication process, that is, when we are using a computer to download a file, or other people through the chat software to send us a paragraph of text, the computer network card is also non-stop to send signals to each other, To indicate that a previous data file has been received or not received. So, whether we upload or download files, seemingly one-way move to do, to the network card is two-way and very frequent data exchanges. So the conclusion from 1 indicates that when one party is weak and one signal is strong, the transmission speed of the whole network is determined by the weak one. 3 Random to the wireless network signal can draw the following conclusions: A. A wireless network card or wireless router's unilateral good or bad can not absolutely cause the whole network signal good or bad B. Blindly increase on the one hand antenna gain, may have no impact on the quality of the entire network (at present, the market, can replace the antenna router than the network card more, and lead to a lot of people unilaterally strengthen the route of the antenna gain, and most of the cases, the route itself antenna gain than the network card is relatively high >, so may be the antenna but the network quality has not significantly improved)

About compatibility issues.

About the compatibility of wireless card, has been very annoying. The main compatibility problem occurs between the router and the NIC and the match between the NIC and the host. In general, if the network card and routers use different brands of the chip, there may be compatibility issues, but this situation is very rare, the current mainly occurs in foreign companies and domestic production equipment. One of the more obvious compatibility issues is that almost all IBM notebooks, almost all HP notebooks, almost all Compaq (Compaq, already purchased by HP) notebooks, need to use special built-in network adapters for these brands (including Mini-pci,mini Pci-express interface, the external interface such as Usb,pcmica and so unrestricted, the router is not required. Some Samsung notebooks have compatibility problems with the built-in NIC, some of which are compatible with the built-in NIC. The use of AMD chip notebooks and laptops using the original ATI chip cannot use Intel's wireless modules, for sure.

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