Introduction to Wireless LAN entry basics

Although wireless LAN has been gradually popular, but in the network planning, system configuration and so on, there are still many users indefinitely. The main purpose of this article is not to teach you how to configure the wireless network, but to highlight some of the installation, configuration and use of wireless network should be noted, so that readers can better understand and put the wireless network.

First, what is the wireless local area network:

Wireless LAN English name: Wirelesslanwlan, similar to our local network of switches or routers, it uses wireless technology, which uses radio frequency (RADIOFREQUENCYRF) technology to replace the old-fashioned stranded copper wire (Coaxial) The local area network makes it possible for the wireless local area network to make use of the simple access architecture so that the user can reach the ideal state.

Wireless LAN Equipment schematic

First, the network to form a chapter

A wireless local area network can be used as the extension of the wired local area network, it can also be independent as the substitute of the wired LAN, so the wireless LAN provides a strong network flexibility. Although this, but in the formation of the network still have a lot of problems to consider, summed up, there are the following:

1. Equipment Purchase Early Preparation

On the purchase of equipment, the author has always thought that focus on product consistency is more important, that is, choose the same manufacturer, the same rate of products, so you can get the best compatibility and stable speed. We look at product packaging instructions, support 802.11B products only support to 11M wireless speed, appears slightly slow but the price is very affordable.

Currently support 802.11g products are mostly 54M products, but also the current mainstream speed, its technical support and relevant information is also very complete, is the focus of the purchase of reference; 802.11g is generally 108-supported rate of 108M, which is the main transmission rate in the next year, If your wireless network on the speed of a certain demand, the purchase of such products is more appropriate, in fact, the price is not the imagination of so expensive, wireless equipment hemp, certainly more expensive than wired equipment.

2. The topological structure cannot be disorderly.

The network structure has the plane topology as the foundation, in any network constructs at the beginning, all should consider the actual network environment.

Wired Wireless Coexistence Environment:

If there is already a wired network, to build a wireless network on this basis, it should be integrated into the cable and wireless equipment compatible, in line with the least investment to do the most things in principle; The general home wired Network is the structure of adslmodem+ broadband router, The easiest way to do this is to add a wireless AP as a wireless signal relay, then configure a wireless network card in your computer; Because the wireless AP does not have virtual dialing capabilities, it should be connected to a broadband router, close to the broadband router for unified management of wired and wireless networks, and the exchange of two types of networks ( However, such management is more cumbersome to configure.

A slightly simpler configuration, easier to manage, is to replace the wired router with a wireless router, and then the LAN port that comes with the wireless router can connect to the computer, which enables good wired and wireless communication on a single router.

A separate wireless environment:

The establishment of a new wireless network environment, also recommended the use of wireless router + wireless network card structure, because this has the greatest adaptability. The LAN port provided by the wireless router comes in handy when a wired connection is required. The specific structure of such environment and configuration also please refer to the relevant articles in the station, no longer detailed here.

3. Signal coverage should be cautious

Although wireless network has been freed from the shackles of cable, how to ensure the network after the formation of the signal coverage, but it is to pay attention to the problem. This refers to the location of the transmitter and receiver of the wireless signal. General wireless AP or wireless router coverage in the open area of about 100m, in the indoor coverage distance is mainly affected by the space partition situation, usually in the 15m range of signals can penetrate two 20cm brick structure partition or a 20cm ordinary concrete partition and ensure the stable operation of the network; When the distance is too far or the gap is more, the wireless network coverage signal does not have enough margin to ensure stable operation of the network.

Therefore, in order to solve the problem of small coverage of wireless AP or wireless router in buildings, especially in buildings with complex structure, it can be solved by increasing the layout density of wireless AP or wireless router, adding the gain antenna and maximizing the use of wireless terminal equipment in the range of signal coverage.