Wireless Q & A User Guide for wireless LAN

This article mainly gives you a detailed overview of some common problems of the wireless LAN, and gives you a detailed description of how to use the wireless LAN safely and effectively.

When purchasing a wireless LAN, users must pay special attention to the following features to decide their own products, including: scope of coverage, transmission rate, extent affected by Multipath, degree of data integration provided, interoperability with wired infrastructure, interoperability with other wireless infrastructure, degree of anti-interference, ease of operation, confidentiality, low cost, and current consumption. The following are some frequently asked questions for your reference.

Q1: Does WLAN affect the human body?

ANS: The launch power of WLAN is much weaker than that of mobile phones, and the launch power is about 60 ~ 70 mW, and about mW Mobile phone, And the use is not like direct contact with the human body, so there is no security considerations.

Q2: What are the most basic configurations of a WLAN architecture?

ANS: Generally, a wireless network card and a bridge (AP) are used to set up a wireless network. In this way, network resources can be shared in a wireless mode with an existing wired architecture.

Q3: Will WLAN interference or affect the operation of other devices?

ANS: basically, the frequency band used by wireless networks is within the high frequency range of ISM 2.4GHz. It does not interfere with the electrical appliances used in daily life or office, because the frequency is quite different, in addition, the wireless network itself has 12 channels available for adjustment, so there is no need to worry about the phenomenon of natural interference.

Q4: How wide can WLAN cover?

ANS: Generally, the scope of WLAN coverage depends on whether the environment is open or not. If an external antenna is not added, it is about 250 m in the field of view. If it is a semi-open space with a compartment, it is about 35 ~ About 50 MB. Of course, if an external antenna is added, the distance can be further reached, which is related to the increase value of the antenna itself, so it depends on the customer's needs.

Q5: How many workstations does the AP actually support?

ANS: In theory, a class c can be supported. However, to enable sufficient bandwidth for the workstation itself, it is recommended that an AP support about 20 ~ About 30 workstations are in the optimal state.

Q6: What is the Roaming function?

ANS: Just as mobile phones can roam between different base stations, WLAN workstations can also roam between different APs, as long as the ESSID of the AP group is defined, then it can roam in the area where radio waves can cover.

Q7: How can I prevent lightning strikes when a WLAN device is deployed outdoors?

ANS: basically, lightning arresters can be configured for WLAN. This device can be installed on a wireless network device.

Q8: What is Access Control?

ANS: basically, each wireless network card has a unique set of hardware addresses, that is, the MAC address. By using Access Control table, you can define certain cards to log on or be denied to log on to this AP to avoid resource theft.

Q9: Does the wire length used by the antenna affect the transmission quality?

ANS: The length, material, and impedance matching of the wire used by the antenna will affect the signal, and the most obvious is gain attenuation. Generally, the signal attenuation is about 1.2dBi, and the average attenuation of 8dBi reduces the original transmission distance by about half.