Is your network speed normal? The speed of the wireless router is high! (1)

For a long time, the speed of wireless networks is the focus of users when selecting wireless devices. Many netizens raised a lot of questions about wireless speed when using wireless networks. For example, "I am using a XX-brand wireless router. How can I keep the wireless speed at 1 Mbps? My ADSL is Mbps, and the connection speed with the XXX brand wireless router is not so slow ." "My laptop uses an Intel 3945ABG wireless network card. How can I upgrade the latest driver to improve the wireless connection speed? But I cannot open the webpage? Who knows what is going on ?" And so on. What's going on?

I. High Speed of Wireless Networks

The speed and stability of wireless network signal transmission have become a concern of many users. For example, when using a wireless network, many users find that a wireless network labeled as 54Mbps or Mbps sometimes shows a transmission speed of around 11 Mbps or lower, and the actual transmission rate is only 1-4 Mbps or lower, what's going on?

This should begin with the nominal speed and actual transmission speed of the wireless network. The early IEEE802.11b standard was an extension with a maximum rate of 2 Mbps for 5.5 11. It can support a data rate of up to 11 Mbps and adapt to a data rate of/2/1 Mbps. The actual working speed is around 4-5 Mbps, and is converted to MB/KB1MB = 8 Mb), that is, the transmission speed is around kb-600kb/s.

Subsequently, the Working Group approved the 802.11g standard, which has the following two features compared with the previous 802.11b standard: it uses OFDM modulation technology in the 2.4G band, which can support a data rate of up to 54Mbps, and adaptive downward 48/36/24/18/12/9/6 M, and 11/5. the data rate is 5/2/1 Mbps. The actual maximum operating speed is about 20 Mbps, which is converted to MB1MB = 8 Mb. The transmission speed is about 2.5 Mb/s.

Subsequently, a variety of non-IEEE 802.11g + standards were introduced, including Super G, Afterburner, SpeedBooster, Nitro and other technologies. Among them, the most representative is Super G, which is widely used in the market, thanks to its Channel combined with Channel Bonding), Real-time Data Compression), Fast Frame Fast Frames) packet burst (Packet Bursting) technology, which can reach the maximum link rate of Mbps, the actual data transmission rate can exceed 40 Mbps.

Broadcom's Afterburner technology can only provide data transmission rates of nearly 30 Mbps, while SMC's Nitro technology can only provide data transmission rates of nearly 27 Mbps. The actual maximum operating speed of the Super G is about 40 Mbps, which is converted to MB1MB = 8 Mb. That is, the transmission speed is about 5 Mb/s. Various 802.11g + standards are incompatible with each other, but both are backward compatible with 802.11g/B.

A 240 m mimo wireless router must be used together with a 240 m mimo wireless network adapter for full use.

After 802.11 g/g +, the MIMOmultiple input multiple output product also emerged. MIMO is the technology for synchronous transmission and receiving of wireless network signals through multiple antennas, the MIMO system uses multi-antenna/array antenna and multi-channel antenna at the transmitting end and receiving end, which improves the transmission rate. Products using MIMO technology are fully compatible with IEEE802.11a/B/g standards, and can effectively improve the product's signal range, so that it has a higher data transmission rate; at the same time, it can ensure stable wireless connection of signals within the transmission range, maintain compatibility with other devices on the network, and have no impact on the surrounding network. Currently, there are two main types of MIMO products: Mbps and Mbps. The actual transmission performance of MIMO products of micron m can reach 40-50 Mbps, which is converted to MB1MB = 8 Mb) that is, the transmission speed is between 5-6 Mb/s.

MIMO of 240 m can increase the theoretical maximum data transmission rate of wireless network devices to 4.5 Mbps per second, that is, times the theoretical transmission rate of 801.11a and 802.11g 54 Mbps. The actual transmission performance can reach about 90-Mbps, converted to MB1MB = 8 Mb), that is, the transmission speed is between 11 and 13 Mb/s.

In addition, emerging 802.11n products are also coming in the wireless development process. The draft 802.11n products are fully compatible with IEEE 802.11b/g products. 802.11n combines a variety of technologies, including Spatial Multiplexing MIMO space Multiplexing, multi-Inbound and multi-output), 20 and 40 MHz channels and Dual Band GHz and 5 GHz ). It can reach a maximum speed of 570/600 Mbps, and the current draft 802.11n product speed is 270/300 Mbps, the actual data transmission rate is generally about 70-90 Mbps, converted to MB1MB = 8 Mb) that is, the transmission speed is between 8-11 Mb/s.