WLAN product selection guide for wireless LAN

There are still many things worth learning about wireless LAN. Here we will mainly introduce the Selection Guide for WLAN products related to wireless LAN. Experts believe that to purchase a wireless LAN product, we must first clarify the protocol types of the wireless LAN, then consider the performance of the wireless LAN gateway, and consider the security performance of the wireless product, finally, you can purchase a suitable Wireless LAN product based on the price.

Wireless Internet access is undoubtedly a great attraction among various Internet access methods. Free and unrestricted internet access is the most favored method for many people. Wireless products give ordinary users the feeling that the spring and snow are high prices and unstable performance make them daunting. Experts believe that to purchase a wireless LAN product, we must first clarify the protocol types of the wireless LAN, then consider the performance of the wireless LAN gateway, and consider the security performance of the wireless product, finally, you can purchase a suitable Wireless LAN product based on the price.

Select the type of the wireless LAN

From the perspective of the development history of Wireless LAN, the first occurrence is that the transmission speed is only 802.11 of 2 m. Because the speed is slow and the Protocol is not very mature, it will soon be replaced by the 802.11b with a speed of 11 m, later, 54 M 802.11a at a higher speed entered people's sight. When 802.11b and 802.11a were in a fierce battle, the 802.11g emerged in a uniform manner. To select a wireless LAN product, first select 802.11a and 802.11b.

802.11b was developed first than 802.11a because the former adopts a relatively simple "ordered propagation spectrum" technology, while 802.11a adopts the "orthogonal frequency division multiplexing" technology. Because the technology used by 802.11a is much more complex, the data rate provided is also very different: 802.11b operates in the GHz band, and the speed can only reach 11 Mbps. 802.11a operates in the 5 GHz band and the speed can reach 54 Mbps. Although 802.11a is fast, there are many problems in its 5 GHz band, most of which are compatibility. Because of different frequencies, 802.11a products and 802.11b-based products cannot achieve interoperability.

To solve the incompatibility between 802.11a and 802.11b, IEEE developed 802.11 Gbit/s, working in the GHz band, thus achieving complete compatibility with older systems. The speed of the 802.11g can reach 54 Mbps, and the penetration capability of the obstacle is also strong. The performance is similar to that of 802.11a, and its device prices are cheaper than that of 802.11a, And it is compatible with 802.11b, because they use the same frequency band and carrier. From the perspective of purchasing, we should give priority to 802.11 GB for wireless LAN products, followed by 802.11b, followed by 802.11a. Wireless Gateways are a very important product in Wireless LAN products. They were previously called AP (Access Point ). The AP of the wireless LAN is responsible for data transmission, receiving, conversion, and transmission. Without it, the wireless Nic becomes an isolated information island. The AP is also responsible for connecting the wireless network 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 networks, especially the needs of broadband sharing technology, this simple Wireless AP is increasingly unable to meet the market demand. There is a wireless router on the market, which will replace the simple AP. The wireless router uses the 802.11 protocol that the wireless network can understand to communicate with each other and negotiate with each other. This will allow the wireless network to expand from a small working group, it dynamically adjusts parameters such as bandwidth, access control, QoS, and mobile users through real-time monitoring of space, network growth, and user density, and thus becomes the brain of the wireless LAN system.

A wireless router is like a product that combines a simple Wireless AP and a Broadband Router. It not only has all functions of a simple Wireless AP, such as supporting DHCP Client/Server, VPN, firewall, WEP encryption, and so on, in addition, the Network Address Translation (NAT) protocol is generally included to support network connection sharing for wireless LAN users. Most wireless routers also include an Ethernet converter with four ports to achieve a smooth transition between wired and wireless networks. For purchasing, we recommend that you do not purchase performance-Only AP, but a wireless router that integrates multiple functions.

Select Product Features

At present, there are many types of Wireless LAN products on the market, each of which has its own characteristics. On the whole, the products of companies with characteristics highlight the advantages of miniaturization and portability, in addition, some vendors advocate multi-functionality and multi-functionality. Some products fully consider the user's needs in product design. Some products are equipped with hanging holes behind them, which can be easily mounted on the wall. As an acceptor device, you can connect devices such as XBOX, PS2, set-top box, laptop, and network printer to an existing wireless network. Some products have interfaces to connect to the printer, which can be converted into a printer wireless server. Some products also support cameras and can become wireless monitoring devices. When purchasing a service, You must select the service based on your needs.