What is Enable 20/40 MHz Coexistence?

If you are the network administrator, you must not select only a 20/40 Mhz channel since some users on your network may be unable to use it properly. That’s when coexistence comes into play. You set the required frequency, and the user makes use of it.

What is the difference between 20 MHz and 40 MHz bandwidth?

Bandwidth denotes the range of your broadcasting channel. 20 MHz is considered “standard” bandwidth, but 40 MHz is twice the channel width.

Many people propose 40MHz mode in 2.4GHz only for individuals who reside in remote areas. In 40MHz mode, your WiFi uses 2/3 of the entire 2.4GHz band, and you compete for air time with your neighbors’ WiFi.

As a result, the 20/40 Mhz deployment is essentially an auto-mode for selecting the frequency to which your wireless devices connect.

Which of the following frequencies is superior: 20 Mhz or 40 MHz?

The truth is that it depends on how you use WiFi. If you often utilize 2.4 GHz, it is preferable to use 20 MHz because it is more compatible with older devices.

Internet users working with 5 GHz, on the other hand, should use 40 MHz instead. This is because continuing to use 20 MHz with 5 GHz defeats the purpose of adopting a higher bandwidth radio setting.

A single 20MHz channel will be more stable in active regions with a lot of frequency noise and interference. A 40MHz channel width provides for quicker transfer rates and higher speeds, but it does not work as well in congested locations.

When should you utilize a combination of 20 and 40 MHz?

If you use a 5 GHz transmitting radio, chances are your network is made up of solely the most recent devices that support 802.11n. This is when the 40 Mhz bandwidth should be used. When Should You Use a 20/40 Mhz Combination? If one of your devices requires it, only utilize the 20 Mhz / 40 Mhz combination.

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What is 20/40 Mhz Coexistence?

To avoid interference across wireless networks, your router is set to use 20/40 MHz coexistence by default. You can disable this option to allow your devices to connect at the fastest possible wireless speed.

The 20/40 MHz coexistence setting permits the 2.4 GHz radio to use the entire 40 MHz bandwidth (and interact with both 20 MHz and 40 MHz bandwidth clients) unless it finds another AP using an adjacent channel on the 2.4 GHz band, in which case interference is unavoidable.

When this happens, both APs will switch to a lower frequency of 20 MHz, allowing them to cohabit. (It means that 40 MHz capable client devices will default to 20 MHz if a 40 MHz bandwidth channel cannot be found.)

This is an AP-to-AP Good Neighbor cooperation policy, not a client too-AP policy.

When the radio is turned off, it continues to run with 40 MHZ bandwidth for capable client devices, and surrounding APs must just cope with it. This is good if there are no (or just one) other 2.4 GHz band APs nearby.

What exactly does Enable 20/40 MHz Coexistence mean?

When you enable 20/40MHz on routers, the maximum speed of your 2.4GHz wireless network is reduced to half when another wireless network is discovered in your surroundings; this is done to avoid interference between wireless networks and to get along with other wireless networks in the environment.

What is the effect of enabling 20-40 MHz coexistence?

A superb wireless internet connection will be available to the user. However, the user has the option to employ the feature or disable it, resulting in the maximum supported wireless connection. It is also necessary to define internet channels.

Why Would It Be Necessary To Enable 20/40 MHz Coexistence?

Routers are already set to 20/40 MHz by default. This assists in avoiding interference with neighboring wireless networks.

Users can, however, disable this feature if they find it more convenient. This makes sense if you want to use the most supported wireless connections.

Bandwidth denotes the range of your broadcasting channel. 20 MHz is considered “standard” bandwidth, but 40 MHz is twice the channel width.

• The maximum width allowed by this standard is 40 MHz.

As a result, obsolete gear cannot make use of this, and therefore 2.4 GHz devices perform better with 20 MHz bandwidth instead. When you enable 20/40 MHz coexistence, you will be able to utilize both available bandwidths.

Various reviewers have determined that customers should use either 20 MHz wide channels or the coexistence capability because depending alone on 40 MHz will result in overlapping connections with others.

How to enable or disable 20/40 MHz coexistenc

To enable or disable 20/40 MHz coexistence, use the following commands:

1. Open a web browser from a network-connected computer or mobile device.

2. Connect to your network

3. Enter your administrative username and password, then click the LOG-IN button.

The Status page loads.

4. If your browser displays the Menu symbol, click it.

5. Navigate to Settings > Wireless.

6. Enable or disable coexistence at 20/40 MHz:

• To allow coexistence at 20/40 MHz, check the Enable 20/40 MHz Coexistence box.

• To turn off 20/40 MHz coexistence, uncheck the Enable 20/40 MHz Coexistence box.

7. Finally, press the SAVE button.

Your preferences have been saved.

What if you can’t find the enable/disable 20/40 MHz feature? If you cannot locate this setting via the standard protocol, it is recommended that you click on Advance, then move to Advance setup, and last click on Wireless setup. You should be able to locate the enable/disable MHz feature there.


According to this article, the 20/40 Mhz coexistence function is meant to provide all users with a varied and safe internet connection across all boards. One of the key reasons the settings are enabled by default is for this reason. Users are unlikely to wish to make a different choice.

You can, however, disable it on your router. This would allow you to reach quicker internet speeds but at the expense of overlapping concerns.

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