【 Weak current College 】 wireless network convergence shortcomings questions addressed

Wireless network connection problems commonly encountered are wireless Internet access, and want to wipe out the treatment doesn't work, then on wireless technology and wireless networks are required to understand. So this article will lead the masses views about what wireless network technology, after the elements for the wireless network problems, perform an analysis of resolve wireless network connection at the beginning of trouble explaining how the instance for the masses to sweep away.

Knowledge of wireless technology

Wireless LAN (WLAN) band is an ordinary in 2.4GHz. microwave communication Transmission characteristic is straight, visible type, i.e. Visual range of communications. This would indicate rain, fog, walls and other obstacles which could affect the quality of microwave transmission. So, let's use wireless technology should also be thinking about these characteristics, in appropriate circumstances to build network.

Wireless communication intervals and radiation power, antenna directivity and antenna gain. Many see wireless equipped with radiation output power of 200 MW, wireless network card's power normal only dozens of mW. Now wireless with ordinary with Omni-directional antenna, radio omnidirectional antenna to the antenna for the shaft, is "Donuts" shape to radiation; directional antenna with strong direction, in a small angle of radiation is completely outside the scope of the signal; to use removable antenna equipment can add gain antenna, you can not add the antenna radiated power of add communication interval.

Microwave in the cable transmission of demanding, signal cable, connector loss beyond people's imagination, ordinary wire do not fit the antenna signal transmission medium.

Wireless network connection problems factors

In rare cases, wireless connection problems with due to improper provoked. Are usually in the form of a communication connection problems, slow, off line, etc. It doesn't workout why ordinary is divided into three:

Environmental factors: the AP and the interval between the network card is too long; AP and card room obstructions, such as indoor complex environment, walls and furniture.

Human factors: tasks in 2.4GHz band microwave equipment such as microwave ovens, network cable, antenna cable contact illnesses; directional antenna characteristics, etc.

Equipped with elements such as equipped with overheating; cache is too small, etc.

Wireless network connection problems and analyzing treatment

Wireless network convergence case-AP + wool a PCI desktops wireless card combinations, 300 square meters and office environments, AP on separate single room Interior, the farthest card communication interval of about 30 m, cover of the AP. The most distant interval after the convergence network card (convergence rate fixed at inter 5.5Mbps ~ 11Mbps) fixed AP location. Construction finished aware of multiple blind spot of convergence.

Analysis: blind spot equipped with regional network card arrangements in landing on a desktop, network cards and AP between operators, PC equipped with, desk cabinet with apparatus and machine room walls blocking communications convergence problems incurred. To think that the room is not suspended ceiling, AP no external antenna interface, so it is not appropriate to use an external antenna. Without added capital, not undermine the Interior appearance, can be hung on the walls of the engine room AP, and the maximum limit increase height adjust terminal location before you can deal with blind spots of doubt.

Wireless network convergence case II AP + wool AP bridging communications portfolio, communication interval of about 150 meters, two AP are indoors, without the construction of the barrier, the communication speed up to 2Mbps, often attack cohesion failure problems.

Analysis: such a basic interval is close to AP bridged up interval, set up external gain antenna is the best treatment plan. Consideration to capital elements, you can use another scenario: two AP device to outdoor walls, the use of two walls as reflectors enhance previous radiation. The AP and walls with aluminium composite panels do pot vessel maintenance, both beautiful and dealt with a waterproof, Sun protection challenges, but also a very good reflection effect. The convergence rate highest arrival at 11Mbps, dropped a scene no longer occur.

Wireless network convergence case three AP + hair laptop wireless card combinations, linear communication interval 20 metres, the Terminal at the location, the AP is located in the basement and the bunkers of angles of sight on the third floor, trouble is when linking hit-or-miss, convergence rate at the highest 11Mbps to nonsignaled waver between.

Analysis: communication interval is not long, but the wall and ground isolation effect the communication quality, environment and reposition objects (vehicles) elements change lead to complex refraction/reflection, the signal strength of a huge change. We can take the following programme fixed signal: Add NIC external antenna; adjust the angle the AP antennas antenna radiation angle perpendicular to the basement notebook network card; in AP antennas on the back-end add specular aluminium composite panel. This process of convergence rate should be fixed.

Wireless network convergence case-4 feather AP + laptop wireless card + PCI desktops wireless card home, which is a typical household using wireless LAN. Users, even if the network card and in the same room AP, two machine ADSL dial-up (lead routing functions) dropped a scene is also very frequent.

Analysis: try using USB or LAN interface between router and PC dial-up connection, assuming that the perceived fixed, long task off line, which can distinguish problems can come from the wireless equipment. Implementation of the improved power quality, thermal, AP, and many other attempts have not seeclear results, the discriminant dropping sight to AP cache too small stir up. Processing method is to replace the access point or limit the transfer rate. About capital, the use of speed-limiting options. Configure the maximum rate of convergence AP 2Mbps, defects clearly reduced, while the two basic needs to be Internet machine.

Wireless network convergence case five Mao a wireless network to replace use of outdoor flat gain antenna, the network Terminal No signal.

Analysis: normally, the use of external gain antenna after network connection interval is added to the network Terminal No signal, there can be something of a directional antenna.Adjust the vertical angle of the direction, after the problem will disappear.

◆ Tidbits: usually far interval convergence of wireless network General will use very high gain, directional strong Yagi antenna, grid antennas, parabolic antenna, backfire antenna. Whereas certain flat antenna with a special design also has a very strong direction and directional gain, this kind of antenna directivity in application can easily be ignored.

Wireless network convergence wool cases six external antenna using time cohesion no signal.

Analysis: antenna using a period of time after the link doesn't work, see why are the bad interface. Test interface can not do a waterproofing, assuming that the episode of rust, available glass glue do external waterproof coating processing. In addition, there will be a special case of lightning, concerning the situation in General is difficult to repair, replacement of equipment should be immediate.