How many standards are there for wireless networks?

There are six standards for wireless networks, namely:

1、802. 1 1a

High-speed wireless LAN protocol, using 5Hz frequency band. The highest rate is 54Mbps, and the actual utilization rate is about 22-26Mbps. Incompatibility with 802. 1 1b is its biggest shortcoming.

2、802. 1 1b

The most popular wireless LAN protocol, using 2.4G frequency band. The highest rate is 1 1Mbps, and the actual utilization rate varies according to the distance and signal strength (within 654381-2 Mbps+0Mbps within 50 meters). 802. The low rate of11b makes the use cost of wireless data network acceptable to the public.

3、802. 1 1e

Based on WLAN QoS protocol, VoIP can be carried out through this protocol 802.5438+05438+0A, B, G. In other words, 802. 1 1e is a protocol to realize voice call function through wireless data network. This protocol will become a powerful weapon for wireless data networks to compete with traditional mobile communication networks.

4、802. 1 1g

802. 1 1g is an extension of 802. 1 1b in the same frequency band. Supports the highest rate of 54Mbps. Compatible with 802.11b. This standard has surpassed 802. 1 1a to become the next generation wireless data network standard.

5、802. 1 1h

802. 1 1h is an extension of 802. 1 1a, which aims to be compatible with other standards in the 5G Hz band, such as HyperLAN2 used by the European Union.

6、802. 1 1i

802. 1 1i is a new wireless data network security protocol, and the loopholes in the popular WEP protocol will become the security risks of wireless data networks. I propose a new TKIP protocol to solve this security problem.

Extended data

Wireless network application field

1, online media

Because the frequency band of wireless network does not need any telecom license worldwide, WLAN wireless equipment provides a wireless air interface that can be used worldwide with extremely low cost and extremely high data bandwidth. Users can browse the web quickly in the Wi-Fi coverage area, and answer and make calls anytime and anywhere.

2. Handheld devices

Wireless networks are widely used in handheld devices, and smart phones are one of them. Different from Bluetooth technology used in early mobile phones, Wi-Fi has a wider coverage and higher transmission rate, so Wi-Fi mobile phones have become a fashion trend in the mobile communication industry.

3. Daily leisure

The coverage of wireless network in China is more and more extensive, and high-end hotels, luxury residential areas, airports and cafes all have Wi-Fi interfaces. When we travel and work, we can surf the Internet in these places with our handheld devices.

4. Passenger trains

201165438 in 2004+10/October 28th 14: 20, the first passenger train with WiFi service in China, the T809 through train from Guangzhou to Kowloon, Hong Kong, started from guangzhou east railway station, marking the beginning of the WiFi (wireless network) era of China railway.

After the train WiFi is opened, you can not only watch high-definition cinemas and play community games on the local area network inside the train, but also directly access the external network, brush Weibo and send emails, and connect with the world at the bandwidth speed of 10-50 megabytes.

Baidu Encyclopedia -IEEE 802. 1 1