Resolve Wireless Network Connection Failure

Nov. 24, 2010 - PRLog -- Failure to resolve wireless network connection

Increasing the price of wireless network equipment accessible, many worms have bid farewell to the shackles of cable and began to enjoy the wireless brought unrestrained joy. But some readers still reflect the network connection failures occur frequently. Today, some wireless connection problems put together for one instance of a detailed analysis and provide solutions.

Knowledge of wireless technology

Wireless LAN (WLA N 2.4GHz operating band is usually in the areas of microwave communications. Transfer characteristic is linear, showing that type of communication is visual contact range. This indicates that rain, fog, walls and other obstacles can affect the microwave transmission quality. Therefore, the use of wireless technology should take into account these characteristics, an appropriate environment to build the network.

Distance wireless communication radiated power, antenna directivity and antenna gain related. Common wireless devices less radiation output power of 200mW, wireless LAN usually only tens of mW of power for wireless devices typically comes with the current omni antenna, omni-directional radio antenna to antenna axis, showed a "donut"-shaped external radiation; orientation antenna is highly directional, small angle of radiation is no signal outside the scope of the use of removable devices that connect an external antenna, gain antenna, the antenna can not increase the case of radiated power to increase communication distance.

Microwave transmission requirements in the cable in a high signal in the cable, the loss of the interface than people think, not suitable for ordinary wire antenna signal transmission medium.

Common wireless network communication failure

In most cases, the wireless device failures are usually due to improper use of the performance problems are connected, communication is slow, dropped calls and other failures. The cause of the malfunction is generally divided into three:

Environmental factors: AP and the long distance between the card; AP and the card there is an obstacle between the effects of complex environments such as indoor, wall, furniture impact.

Human factors: work in the 2.4GHz frequency band of microwave devices, such as microwave ovens; network cable, antenna cable contact failure; characteristics of directional antennas.

Equipment factors: such as equipment overheating; cache is too small and so on.

Failure example and analysis solution

Once a AP + PCI desktop wireless network card portfolio, 300 square meters of office environment, AP in separate rooms within a single room, the farthest distance of about 30 meters communication card, AP coverage area. The most remote connection to normal when the network card (connection rate stability between the 5.5Mbps ~ 11Mbp) fixed AP position. After construction is completed there are several connections that blind spot.

Analyze and solve: blind placement of equipment in the landing area network card on the desktop, network cards and operator between AP, PC equipment, appliances, cabinets and desk room walls blocking communication links lead to failure. Taking into account the room is not the ceiling, AP no external antenna connector, it is not suitable for use an external antenna. No extra cost, does not destroy beautiful indoor conditions, the AP can hang outside the walls in the engine room, and to maximize installation height, adjust the terminal location problem can be solved with blind spots.

Example Two AP + AP bridge communications portfolio, communication distance is about 150 meters, the two AP are in the room, barrier-free building, communication of up 2Mbp frequent failure of connection failures.

Analyze and solve: that was close to AP bridging the distance between the most remote, set up an external gain antenna is the best solution. Taking into account cost factors, you can use another program: two outdoor AP installation to the wall, the use of two walls in front of a reflector enhanced radiation. AP to aluminum plate between the wall basin-shaped container made protection, both beautiful and solve the water, sun problem, also play a very good reflection. After the connection rate up to 11Mbp dropped phenomenon does not occur again.

Example Three AP + laptop wireless card combination, linear communication distance of 20 meters, the terminal location in the basement, AP located in the basement of the building perpendicular to the third floor, the failure phenomenon is good and bad connection, the connection rate to no signal at the highest 11Mbp between the fluctuations.

Analyze and solve: communication distance is not long, but the role of the wall and the isolation of the communication quality, the environment of moving objects (vehicles) factors causing complex changes in refraction / reflection, the signal intensity is huge. Stable signal can take the following programs: to increase card external antenna; adjustment AP antenna, the antenna radiation angle of the angle perpendicular to the basement laptop card; AP antenna reflector back-end increase in aluminum plate. This treatment should be able to stable up connection rate.

Four cases of AP + laptops + PCI desktop wireless network card wireless network card household composition, which is a typical home wireless LAN applications. User to reflect, even if the network card and the AP in a room within the same two machines ADSL dial-up (Dailu function) dropped very frequent phenomenon.

Analysis solution: Try to connect using the USB or LA N router and PC, dial-up connection if found stable, long working hours are not dropped, which can determine the failure may come from wireless devices. AP carried out to improve power quality, thermal, and other attempts were no significant effect, the judge dropped the phenomenon of the cache is too small for the AP approach is due to replace the AP or limit the transmission rate. Consider the cost, the use of speed limit program. Set the maximum connection rate 2Mbp AP, the failure significantly reduced the two machines are basically meet the needs of both the Internet.

Five cases of replacement of a wireless network using flat-gain outdoor antennas, the network terminal no signal.

Analyze and solve: Under normal circumstances, the use of an external gain antenna will increase after the network connection from the network terminal no signal, there may be a directional antenna directional failure. Adjust the direction, the vertical angle will disappear after the failure.

Tips: usually long-distance wireless networks connected to the general will choose a high gain, highly directional Yagi antenna, grid antennas, parabolic antennas, backfire antenna. And some specially designed flat-panel antenna also has a strong direction, and after the directional gain directional antenna type in use, easier to ignore.

Six patients with external antenna connection no signal after a period of time.

Analyze and solve: antenna connection failure after a period of time, common cause, the interface is bad. Check the interface is good waterproofing, corrosion if the situation occurs, use glass, plastic waterproof coating for external processing. In addition, there may have been struck by lightning in the special circumstances of this case is very difficult to repair, should immediately replace equipment.

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