Enterprise wireless access points use three major notices

By the enterprise demand for mobile services to increase significantly, as well as the main market channel sales more than expected factors such as the promotion of enterprise wireless access points more and more popular, has become the enterprise Network product development process on another milestone. But because many enterprise users are the first time to use wireless access devices, in the use of some problems, how to deal with these problems?

Speed matching problem

As we all know, wireless devices have evolved from the early 802.11b (11Mbps) specifications to the mainstream of 802.11a/g (54Mbps) and 802.11n (270/300mbps) and MIMO (108/240mbps), followed by product forward compatibility. For example, when a 802.11g device detects a 11b device, the 11g device rts/cts handshake (request-to-send/clear-to-send) to each packet before sending the packet. 802.11G wireless devices can work in a 802.11B network environment, but the speed is only 11Mbps, not up to 54Mbps rate.

Use high-speed wireless equipment to pay special attention to speed matching, lest the big horse cart

In addition, 802.11g products are not compatible with 802.11a, although they can reach 54Mbps rate, but they work in different frequency bands. The same is true for several 802.11g+ (802.11g enhanced) products (Atheros introduces Super G technology to upgrade the nominal WLAN transfer rate to 108mbps;conexant launch 140M Nitro XM Technology Broadcom also introduced 125M Afterburner technology products), and they can only be compatible with each other's product standards.

and 802.11n (270/300mbps) and MIMO (108/240mbps) products in combination with the use of this problem. As long as there is a different high-speed device in the network, they can only work best in 802.11g (54Mbps) mode, because the wireless devices of different technology are not compatible with each other, but are compatible with the most popular 802.11g.

Therefore, enterprise users in the selection of wireless products, must pay attention to standard matching, that is, to achieve the best wireless speed, the choice of wireless AP or wireless router, wireless network card must be the same standard products. For low speed wireless network devices in enterprise wireless networks, if you do not want to reduce network performance, the best solution is to reduce the number of customers in Low-speed wireless devices or upgrade them to the same standard mainstream high-speed wireless device.

Of course, due to the particularity of wireless transmission, not all of the networks are using the mainstream 802.11g+ (108Mbps and above) and 802.11n (270/300mbps) and MIMO (108/240mbps) devices, the entire wireless network must be at full speed state. Wireless device connection distance and a variety of signal interference will reduce the performance of wireless networks, even if the entire wireless network only two such devices (in order to keep the signal connection automatically spin down), the speed of the entire wireless network will also be reduced to the minimum speed.

Second, the problem of signal coverage

Therefore, in order to make the wireless network composed of AP, wireless router and wireless card to meet the optimal performance, in addition to its performance and standard matching, the factor that can achieve the best performance depends on your use environment. As a result of the wireless network can not achieve the best performance of the signal coverage problems are mainly the following points:

Distance, transmission distance is the wireless signal in the transmission of signal failure irresistible factor. Although many wireless products in the nominal transmission distance are said to be able to transmit the farthest indoor 100 meters, outdoors the farthest 300 meters; some products are known to reach the farthest indoor 200 meters, outdoor farthest 830 meters, but this is the theoretical transmission distance, in such a transmission distance, even to connect, but its connection speed is certainly very low.

And to try to overcome this distance caused by the wireless signal attenuation, to achieve better transmission speed, there are two main ways. First, in the wireless network to increase the number of wireless AP or wireless router, and reasonable and wireless card collocation, it is best to do between the two indoor direct transmission distance not exceeding 20 meters, outdoor farthest not exceeding 50 meters.

In addition, the antenna with high gain can be considered to solve this problem. Because of its no directionality, omni-directional antenna is used in the central station of point-to-point communication. Directional antenna has the maximum radiation or receiving direction, so the energy concentration, the gain relative omni-directional antennas to be high, suitable for long-distance point-to-point communication, at the same time because of directional, anti-interference ability is stronger. If special point-to-point remote directional connection is required, enterprise users may consider purchasing a high gain directional antenna.

And the market also has support Dual-band (dual-frequency) directional high gain antenna, can provide a stronger signal to any place to receive, can enhance the signal to the distant corner, and the previous signal inaccessible blocks, this feature for the Enterprise wireless network environment requirements, can bring quite ideal and substantial help. In addition, the product is generally accompanied by a magnetic chassis, can be firmly placed on the table, on the plane, hanging on the wall, or directly on the AP or wireless router, and adjustable mechanical device design can make the antenna adapt to various environments.

Indoors if not very good to avoid the steel mix wall, speed is difficult to reach full speed

Of course, to achieve better signal coverage and connection speed, reduce the interference source of wireless signal can not be ignored. The speed of the wireless network cannot reach the maximum speed of the IEEE standard, it is likely that other wireless devices are interfering with the WLAN wireless transmission, or some materials in the surrounding environment absorb or reflect the radio waves, and reduce the performance of the wireless network.

When you find a wireless network coverage area has a serious drop, slow, poor coverage, and you check all the hardware devices and parameter settings, but the impact of network traffic quality is still not eliminated, it is likely that your WLAN will have wireless interference. Many sources of interference adversely affect the performance of WLANs, such as cordless phones (2.4 or 5.xGHz), Bluetooth devices (2.4GHZ), pulse radar (5.4GHZ), microwave ovens (which will generate pulse interference in the 2.4GHz band), low energy RF light sources (2.4GHZ), and meet emerging " Full Band "required broadband 5GHz devices, from a 802.11 ap or wireless router to another 802.11 AP or wireless router caused by in-band interference and so on, you can pay attention to the erection or placement of these devices."

Besides, enterprise users in the use of wireless access devices should also pay attention to the biggest feature of wireless is almost straight line transmission, diffraction ability is very weak, so the wireless receiving device in the rear of the obstacle will receive very faint signal, or did not receive a signal; The barrier to the largest metal object is the reinforced concrete wall, The signal in this direction is almost impossible to penetrate, so pay special attention to avoid it. Location point selection should be to make the signal as little as possible through the steel mixing wall, the best equipment can be looked directly between.