When did wifi become popular?

20 10 domestic wireless network coverage is more and more extensive, and high-end hotels, luxury residential areas, airports and cafes all have Wi-Fi interfaces.

Manufacturers only need to set up "hot spots" in crowded places such as airports, railway stations, coffee shops and libraries, and access the Internet to these places through high-speed lines.

In this way, because the radio waves emitted by "hot spots" can reach the radius range of tens of meters to 100 meters from the access point, users can access the Internet at high speed as long as they bring their laptops or PDA or mobile phones or psp or ipodtouch with Wi-Fi function into the area.

Technical characteristics of WiFi

First, advantages

1, the radio wave coverage is wide, and the WiFi radius reaches 100 meter, which is suitable for use in unit floors and offices.

The wireless network specification of 2.802. 1 1b is a variant of the IEEE 802.1/network specification. The maximum bandwidth is 1 1Mbps. In the case of weak interference or signal, the bandwidth can be adjusted to 1Mbps, 5.5Mbps and 2Mbps, and the bandwidth can be automatically adjusted, thus effectively ensuring the reliability and stability of the network.

3. The advantage of cableless WiFi is that it does not need wiring and is not limited by wiring conditions. Therefore, it is very suitable for the needs of mobile office users and has a broad market prospect.

Second, shortcomings.

IP wireless network has the disadvantages of long switching time, small coverage radius and low bandwidth, and cannot support high-demand applications such as mobile VoIP.

Because the wireless network system is not open to the development of upper-level services, it is difficult to launch many services suitable for IP mobile environment. WLAN products for home users cannot meet the requirements of operators for network maintenance and operation in many places.