Router bandwidth: choose 20 or 40

It is best to select the router bandwidth automatically. The router will automatically transmit the frequency according to your network speed. Automatic means that the route automatically switches according to the environment. Generally, it is set to automatic; if there are few signal sources, just specify 40M.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

It is best to select automatically. The router will automatically transmit the frequency according to your network speed.

1. 802.11n supports 20MHz and 20MHZ/40MHz channels. The 20MHZ bandwidth was used in the previous standard, and the 20/40MHZ bandwidth was used in 802.11n. The 40MHz channel provides more than twice the available channel bandwidth of the two 802.11 legacy channels. The 802.11n standard supports 20MHz and 40MHz channels, among which The 40MHz channel will be the widest channel, consisting of two adjacent and legacy 20MHz spectrum channels; of course, it is also possible to use only the 20MHz channel, which is determined by specific circumstances.

2. The 20mhz signal has strong penetrating power, but may cause slower download speeds; the 40mhz signal has strong download capability, but may result in a narrow coverage area. A specific example is that the frequency band bandwidth refers to the transmission frequency width of your router:

20MHz corresponds to a 65M bandwidth with good penetration and long transmission distance (about 100 meters).

40MHz corresponds to 150M bandwidth, poor penetration, and short transmission distance (about 50 meters).

3. If there are few wifi signal sources around you, it is best to use a bandwidth of 40, so that the speed can be maximized. If there are many wifi signal sources around, the limited channel will be congested. If the 40M bandwidth is used, the speed will not be fast but slow. At this time, it would be better to use 20M bandwidth to reduce the chance of the channel being occupied. So whether to use 20 or 40 depends on the environment.

Auto, the route automatically switches according to the environment, and is generally set to automatic. If, as mentioned in the first case, there are few signal sources, just specify 40M.

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