Wireless LAN Product Guide

In a variety of internet ways, wireless internet is undoubtedly a huge temptation. Free Internet network is not bound by cable, is a lot of people's favorite way of surfing the Internet. Wireless products to the average user's feeling is highbrow, high prices and unstable performance so that ordinary users in awe.

Experts believe that the choice of wireless LAN products, first of all to understand the Wireless LAN protocol type, and then need to consider the performance of wireless LAN Gateway, considering the safety performance of wireless products, finally combined with price factors to buy a suitable for their own wireless LAN products.

Select the type of wireless LAN

From the history of wireless LAN development, the first appeared is the transmission speed of only 2 m of 802.11, because the speed is slow and the protocol is not very mature, quickly replaced by 802.11b speed 11M, then, the more high-speed 54M 802.11a into people's view, When the 802.11b and 802.11a fierce fighting, 802.11g again to unified the posture of rivers and lakes came out. Select the Wireless LAN products, you should first choose 802.11a, 802.11b.

802.11B than 802.11a developed first, because the former uses relatively simple "sequential spread spectrum" technology, and 802.11A uses the "Orthogonal frequency Division Multiplexing" technology. Because the 802.11a technology to be more complex, and thus provide the data rate is very different: 802.11b working in the 2.4GHz band, speed can only reach 11mbps,802.11a work in the 5GHz band, the speed can be up to 54Mbps. Although the 802.11a speed is fast but its working 5GHz frequency band has many problems, the most important is the compatibility. Because of the different frequencies, 802.11a products and 802.11b based products can not interoperate.

To resolve 802.11a and 802.11b incompatibilities, IEEE developed 802.11g, working in the 2.4GHz band, thus achieving complete compatibility with older systems. 802.11G speeds can reach 54Mbps, the penetration of obstacles is also strong, in terms of performance and 802.11a similar, and its equipment price than 802.11a cheaper, and can be compatible with 802.11B, because they use the same band and carrier. (Computer science)

From the point of view of the purchase, the current procurement of wireless LAN products, should be a priority to purchase 802.11g, followed by 802.11b, then 802.11a.

The simple support of 802.11B equipment development prospects are worth considering, procurement needs to be cautious.

Select Wireless Gateway

Wireless LANs are a very important product in wireless LAN products, which used to be called AP (Access point). Wireless LAN's AP is responsible for the data receiving, transferring and transmission tasks, without it, the wireless network card has become an isolated information island. The AP is also responsible for connecting the wireless to the wired network.

With the development of technology, the previous simple AP function has changed, the previous simple wireless AP is like a wireless hub. With the development of wireless network, especially the need of broadband sharing technology, this kind of simple wireless AP has been unable to meet the demand of the market. There is a wireless router on the market that will replace the simple AP.

Wireless routers are able to communicate and negotiate with 802.11 protocols that wireless networks can understand, allowing wireless networks to expand from small workgroups, dynamically adjusting bandwidth, access control, QoS, and mobile user parameters by real-time monitoring of space, network growth, and user density. Thus becomes the brain of the WLAN system.

A wireless router is a product that combines a simple wireless AP with a broadband router, not only with all the features of a simple wireless AP, such as supporting DHCP client/server functions, supporting VPNs, firewalls, supporting WEP encryption, and so on, and generally including network address translation (NAT) protocols, To support network Connection Sharing for wireless LAN users. Most wireless routers also include a four-port Ethernet converter that enables a smooth transition of wired and wireless networks.

For the purchase, it is currently recommended not to purchase simple performance of the AP, but should buy a variety of integrated functions in a wireless router.

Select the characteristics of the product

Currently on the market, there are many kinds of wireless LAN products, they have their own characteristics, from the overall view, the characteristics of the company's products highlight the advantages of miniaturization and portability, and some other manufacturers to promote multi-functional and multi-purpose.

Some products in the product design also fully considered the needs of users, and some products with hanging holes behind, you can easily hang on the wall. As a receiving-end device operation, you can connect devices such as Xbox, PS2, set-top boxes, laptops, and network printers to existing wireless networks. Some products have interfaces to connect to printers and can become printer wireless servers. Some products also support the camera, can become wireless monitoring equipment. When the specific procurement, it is necessary to choose according to their own needs.