Wireless technology-answers to eight common questions about WLAN

This article summarizes some of the frequently encountered questions about wireless technology and provides detailed answers. I hope this article will help you in your future work.

FAQs about wireless technology WLAN = GPRS?

Many friends once asked if the laptop equipped with a wireless network card can connect to the AP to access the Internet anytime, anywhere? In view of this incomplete understanding, it is necessary to elaborate here. To be accurate, WLAN is not a real wireless Internet technology, which can be seen from its definition of a wireless LAN. At the same time, Wireless AP is not a device that exchanges data with the Internet, similar to Modem modulation and demodulation, it is actually a wireless switch-will be from a wired network such as the Internet) the received data is converted into a wireless signal and sent, and the received wireless signal is converted into data and sent back to the wired network. Therefore, it is wrong to think of a Wireless AP as a device that accesses the internet anytime and anywhere like GPRS. This "wireless" is not "wireless ".

Wireless technology FAQ 2 EEE 802.11b or IEEE 802.11g?

This is a topic that people often discuss. It is undeniable that in terms of performance, IEEE 802.11g has a great advantage, and the transmission rate of 54Mbps can meet the needs of high bandwidth network applications. However, I believe that IEEE 802.11b is still the best economic option for building a local wireless LAN. Although its transmission rate is only 11 Mbps, the actual value is 500 ~ KB), but the access speed is higher than that of common household broadband types such as DSL and LAN, which can fully meet the needs of domestic users for wireless broadband Internet sharing.

Wireless technology FAQ 3: Wireless Network Security?

Because wireless networks are not subject to geographic location restrictions as wired networks do, as long as there are wireless signals that can be easily connected, security issues have attracted much attention. Although domestic wireless networks do not require data confidentiality as strict as they are in commercial fields, no one wants to share their limited bandwidth with unfamiliar users in the face of increasingly crowded network speeds, therefore, you should select an appropriate encryption method for the home wireless network. There are two main types of comparison: one is 64-bit/128-bit WEP data encryption. This method is highly secure, but the transmission speed of valid data is affected because the encryption/decryption process consumes some wireless network bandwidth. The second is to disable the wireless ID of the ap ssid, so that the SSID indication of the wireless network will not appear in any available network connection. The user can connect only after entering the SSID, the SSID of the AP indicates that the user name and password can be changed at will when the AP is managed ), therefore, this method does not lose the transmission speed, but also plays a "encryption" role, effectively preventing unauthorized user intrusion, is the best defense for home wireless networks.

Wireless technology FAQ 4 What is the initial verification password?

As mentioned above, most APs currently provide Web-based management. You need to enter the user name and password 3 when you first enter the management interface ). Generally, the vendor will indicate the default user name and password when the AP leaves the factory in its product manual. If you are buying a second-hand product without instructions, you can only download the corresponding product manual from the manufacturer's homepage. For wireless APs with special accounts and passwords set by the "former master", you can use the "factory reset key" to restore the default value.

FAQ 5 of wireless technology: how to put it in place?

AP placement is also scientific. In essence, a wireless signal is a type of RF signal with interference problems, while an antenna is a kind of directional component. It can only emit high-intensity energy in a specific direction, therefore, the placement position of the antenna-the placement position of the Wireless AP will greatly affect the effect of the RF field, thus affecting the signal quality and signal strength. For this reason, the Wireless AP should be placed in an open, non-obstacle location. Generally, the "center" location is the best position to achieve the best signal coverage effect.

According to the specific situation, the apartment type below 100 square meters is generally two rooms and one hall. When the wireless network is deployed, the Wireless AP is placed in the living room or the intersection of several rooms, with the best effect, the signal placed in other rooms is slightly less. For an apartment of more than 150 square meters, such a room is generally complicated. Similarly, the best effect is to place the wireless gateway in the intersection port and in other rooms, the signal must be tested before the dead ends of the wireless signal can be identified.

Wireless technology FAQ 6 how to view signal strength?

If your computer is using a Windows XP or Windows 2000 operating system, you only need to click the wireless network status icon in the taskbar to learn the strength of the wireless signal, this is the most intuitive detection method.

In addition, most of the wireless networks connected to the PCMCIA Interface on the market currently have dedicated management software matching them. Using this software, you can query the wireless network status in detail and set various functional parameters. Taking Lucent ORiNOCO as an example, using its own ORiNOCO Client Manager management software, you can implement functions such as signal viewing, channel selection, and wireless encryption, which are also very convenient to set.

Some brand computers often have more powerful management software, such as the IBM ThinkPad laptop, using the IBM Access Connection software and wireless network card, the detection value of wireless signal strength can be precise to 1%.

Wireless technology FAQ 7 What should I do when the signal is weak?

This is a problem that every network user may encounter. It is mainly reflected in symptoms such as poor signal quality and unstable data transmission. Generally, you can add external antennas, set wireless channels, and adjust the placement of wireless APs. If the problem persists, refresh the firmware of the wireless network card and upgrade the driver.

Wireless technology FAQ 8: Is there interference in home wireless networks?

This is for sure. The room wall materials, furniture, and even the door switch will affect the wireless signal. Because the 802.11b/g operating frequency is 2.4 Ghz, and many industrial devices work in this frequency band, 802.11a is much better in terms of anti-interference. In addition, it is worth noting that the mobile phone signal has great interference with the wireless network, so we should try to stay away from the storage point of the Wireless AP when using it, so as not to affect the connection quality of the wireless network.