What is WiFi Channel and Channel Width?

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Recently, WiFi had become one of the most common wireless standards in use around the world. It connects us to the Internet and other devices without physical cables. Channels are one of the important elements between WiFi networking. The use of the term Channel makes sense, as it is in actual a Frequency band to transfer data between Router and client devices. The WiFi Channel width, in particular is key to wireless network performance and quality of experience-characterized as simply the amount More spectrum used for data transmission. Hence, it is advisable to invest some time in understanding both the processes which helps you in tuning your wireless network optimization. Stay tuned on WiFiAdviser to learn more...

What is WiFi Channel?

WiFi channels are the small segment of frequencies that your wireless router uses to send and receive data between your devices and the internet. Think of WiFi channels as separate lanes on a highway for clarity. Every channel (Lane) has a different frequency and if you pick a less congested lane, your connection speed and stability improve. There are two primary frequencies in which WiFi operates, 2.4GHz frequency band (Wider coverage but lots of crowding) and a 5GHz frequency band(not as congested, also has higher possible speeds but with slightly limited range comparatively).

2.4GHz frequency band has 14 Non-Overlapping Channels (From channel 1 to channel 14) However, for technical reasons only 3 channels can be used without overlapping (more efficient), these are 1,6 &11.

5GHz Frequeny Band has 25 channels, But for indoor use only 8 of them are defined.

2.4GHz and 5GHz Channels

2.4GHz and 5GHz Wi-Fi Channels Overview

Secrets of WiFi Channels: Power, Range, and Interference

In this post, we are going to explain the characteristics of WiFi Signals, from Power , Range , Interferences and channels. Knowing the mystery of every WiFi channel is very useful for optimizing your networks. Every 2.4 and 5 GHz channels having a maximum power of transmission (TX) from the station to its minimum range at which it can communicate with other stations on that channel, and their potential interference level. In the next topic we will see how these aspects vary by channel and what that knowledge implies when setting up a WiFi environment for top performance.

The Mystery Behind 2.4GHz WiFi Channels

The 2 GHz frequency is more useful than the newer 5 GHz band due to its wider coverage range and superior ability to pass through obstacles and walls. The very important point here is that all the channels of this frequency are not the same in terms of capabilities such as output power, interference level and coverage area. For this reason, knowing the secrets behind the curtain of each channel can help you to better optimize your Wi-Fi network.

As We have mentioned, There are 14 channels in 2.4GHz frequency band, but only 11 of them can be used in many regions. Because channel 1,6,11 do not overlap with other channels, they are most widely used to avoid interference. What you can observe about each of these channels and more in detailed look.

Channel	TX Power	Range	Interference
1	Moderate	Excellent indoor coverage, ideal for small to medium-sized homes	Not as low as Channel 6, but crowded in urban areas
6	Highest	Great coverage and good signal penetration through walls/obstacles.	Very Popular, Busy So performance issues in high density areas are a risk
11	Moderate to High	Good coverage, nearly equal to Channel 6 but more stable in some situations	More open than Channel 6 for a compromise between range and lack of conflict

What about Channels 2-5, 7-10 and 9 – 10

While Channels 1,6 and 11 are the most frequently recommended since they don’t overlap with each other , that doesn’t necessarily mean you should restrict yourself to using ONLY these channels. Such channels (2-5,7-10) overlap with one another and are adjacent to primary channels, which means that it may be more susceptible to interference and performance may fall back significantly. And in very narrow circumstances, these channels could still be helpful.

TX Power: Similar to the non-overlapping channels

Range: Comparable to Channels 1, 6, and 11

Interference: Higher due to overlapping frequencies with neighboring channels, leading to potential signal degradation

Use Cases: Only in environments with very low Wifi congestion, or all non-overlapping channels are heavily used while having under-performance issues. For cases like this special use case though, it is beneficial to at least be able to identify if these channels could provide a better experience and advanced WiFi analysis tools can help you with that.

The Mystery Behind 5GHz WiFi Channels

Due to the speed difference between the 2.4 and 5GHz frequencies, the 5GHz has found itself becoming popular since it is less crowded than 2.4GHz in most homes and businesses. But, in order to make the most of it we should know what differentiates each channel within this frequency range. This information about the transmission (TX) power, range, and interference levels can greatly assist you in taking appropriate steps to optimize your WiFi network for a better performance. The 5GHz band has much more channels available in it, like we talked about before. These different segments are divided into types of channels, each with its own specifications. If you want to know more, read on:

Channel Range	TX Power	Range	Interference
Lower Channels (36-48)	High	Perfect for indoor use, strong signal strength and good coverage	Minimal due to fewer competing networks in this range
Middle Channels (52-64)	Moderate to High	Good balance of coverage and speed	Dynamic Frequency Selection (DFS) regulations apply–channel does not operate when radar is detected on the operating frequency.
Upper Channels (100-140)	High	Optimal for high-speed/high-performance applications	Low interference but must comply with DFS regulations
Highest Channels (149-165)	Moderate	Shorter range compared to lower channels, but still effective in dense environments	Least Interference, best for networks with many overlapped signals

How to optimize your 5GHz WiFi

Here are a few tips to help you get the best out of your 5GHz WiFi.

Environment	Recommended Channels	Characteristics
Indoor Use	36-48	High-performance with low interference
Moderate Congestion	52-64	Good balance of coverage and speed; Check the DFS regulations
High-Performance Needs	100-140	Ideal for high-performance applications; consider potential DFS interruptions
High-Density Areas	149-165	Greate for dense environments with minimal interference

5GHz Wi-Fi Channels

Overview of the 5GHz Wi-Fi Channels — Credit : securityuncorked. com

DFS: How Dynamic Frequency Selection Impacts the Performance of WiFi

Dynamic Frequency Selection (DFS) is one of the key characteristics of modern WiFi systems and specially for 5GHz band. Knowing DFS and how it affects WiFi performance will enable you to decide how to set up your network.

Dynamic Frequency Selection (DFS)

Based on legal requirements, any device in the 5GHz frequency spectrum must have the DFS to avoid conflicts with radar systems and other vital communication services. If a radar signal be found on the channel your router or access point is using, it will quickly move to another free DFS-enabled channel. This ensures optimal operation of your WiFi network and constant operation of the RADAR.

How Does DFS Work?

Channel Monitoring: DFS-enabled WiFi routers track the designated channel for radar signals continuously.

Radar Detection: When radar signals be detected, it leaves the current channel and in a specified time frame.

Channel Switching: The router immediately moves to another, non-DFS channel or a DFS channel, not used by radar.

Channel Availability Check: Before switching to another channel, router first check whether any radar signal exist on that channel or not.

How Does DFS Affect WiFi Performance?

Temporary Disruptions: When a radar signal detected, the router switches to another channel, it may causing a short disconnect of WiFi. This could affect sensitive services like video streaming or online gaming.

Improved Throughput: By allowing access to more channels, especially in highly congested environments, DFS can significantly increase data throughput.

Best Practices for Using DFS

Best Practice	Description
Enable DFS on Modern Routers	Make sure your router supports DFS and set it on to increase the availability of accessible channels over 5GHz band
Monitor Network Performance	See how well DFS is performing for your network using the WiFi analyser tools; if necessary, adjust settings
Consider Your Environment	Expect more channel changes in high radar areas (e.g., near airport or military bases). It may require balancing the type of channel DFS/non-DFS.

DFS lets you employ extra channels so that nearby routers are less likely to interfere with one another, therefore reducing congestion on your network and boosting WiFi performance generally. Consider in mind, If the channels are switching, there could be some transient disturbances.

What is WiFi Channel Width?

Channel Width, however is the size (Width) of the channel your router uses to transmit data. In general, the wider channel width is going to be faster because more data can go through at once. On the other hand, larger channels are more likely to interfere with neighborhood Wi-Fi networks so you want to pick an appropriate channel width for your environment that balances speed against compatibility and performance.

Basically , Each frequency band (2.4GHz or 5GHz) essentially has a designated permitted range for use in WiFi systems. Technical factors have driven the standard organizations to split these ranges to channels (14 channels in 2.4GHz and 25 channels in 5GHz frequency bands), each with particular width, sometimes referred to as Channel Width. While each channel in the 5GHz band might be 20,40,80 or 160 MHz, in the 2.4GHz range their breadth is 20MHz.

The width of WiFi channel determines how much data can pass through the channel in a period of time. Suppose the channel as a highway and the channel width as highway’s width. The more traffic (data) can travel across the wider highway. WiFi network’s speed and capacity can be raised by choosing wider channel. ( Read More : WiFi Standards Chart )

What Channel Width? The right answer.

In theory, more bandwidth can be achieved by using a wider channel, keep in mind the interferences and device compatibility. The overall performance for your wireless network depends on choosen channel-width. Several factors can affect the suitable width: the kind of devices connected, the density of nearby networks, and the condition of the physical environment

Read More: How to Boost WiFi Signal With Aluminum Foil

Now, based on your brief knowledge about channel and channel width, we can choose the channel width more accurate. Here’s a detailed guide on when to use different channel widths:

When to Use 20 MHz Channel Width?

A 20 MHz channel width is typically used when there is a high density of devices or interference in the surrounding environment. It provides better throughput performance and can help in reducing interference from neighboring networks.

In 2.4GHz Band

Use a 20 MHz channel width in the 2.4GHz band in the following scenarios:

2.4GHz-Only Router: If your router just support the 2.4GHz band (Single Band Router).

Legacy Devices: If older client devices in your network not support wider channels.

High Interference: If you have high levels of interference around your from neighboring networks or devices.

Maximum Coverage: When you need maximum coverage of your router.

With a 20 MHz channel width in the 2.4GHz band, you will have 3 non-overlapping channels: 1, 6, and 11.

In 5GHz Band

Use a 20 MHz channel width in the 5GHz band in the following scenarios:

Maximum Coverage: If you want router’s maximum coverage.

High-Density Environments: When a WiFi network be installed in an environment with many connected devices.

With a 20 MHz channel width in the 5GHz band, you will have 8 non-overlapping channels: 36, 40, 44, 48, 149, 153, 157, and 161.

Specific 20 MHz Channel Width Scenarios

Densely Populated Urban Areas: Setting your device to use the 20 MHz channel width can assist prevent conflict and keep connected if you live in a highly crowded location with lots of WiFi networks surrounding.

Older Devices: A 20 MHz channel width ensures compatibility and steady performance if your older devices are not able of supporting wider bandwidths.

When to Use 40MHz Channel Width?

Overall data transmission rate is increased by using 40 MHz channel width; it works with a wider frequency band and provides more throughput than the conventional 20 MHz channel width. Technically, In the 5GHz spectrum, connecting two 20 MHz channels creates the 40 MHz channel width. Higher data rates and better performance are therefore made possible.

However, choosing a 40 MHz channel width also consumes more of the accessible spectrum. This could cause a lot of interference, particularly in homes where several WiFi networks operate close together. In minimal interference or a clean wireless environment, you should be just using 40 MHz channel width. Use WiFi analyser tools to determine the best channel before configuring your router to 40 MHz channel width by assessing the interference level.

With a 40 MHz channel width in the 5GHz band, you will have 4 non-overlapping channels: 38, 46, 151, and 159.

Balancing Speed and Reliability

High Density Areas: When you want to maximize network utilization in crowded WiFi environments, 40 MHz channels are suitable. Without significant increase in interference, it doubles the throughput than that of the 20MHz channel.

Mixed Device Environments: Setting your router to 40 MHz lets your network balance speed and compatibility whether it hosts both modern and older devices.

Specific 40 MHz Channel Width Scenarios

Need for Faster Speeds: If you want to get faster throughput for activities like streaming HD contents or online gaming, but your area isn’t too congested with other networks.

Dual-Band Support: If your clients support dual-band WiFi (2.4GHz and 5GHz) and can take advantage of the wider channel without affecting the stability.

When to Use 80MHz Channel Width?

80 MHz channel width can be utilized when faster throughput and data rates are desired for a network from the available spectrum. Still, some factors should be taken into account:

Considerations for Using 80 MHz Channel Width

Interference: Wider channel width increases your chance of interference from other nearby networks or devices. Only utilize an 80 MHz channel width where it won’t interfere other networks. Before employing an 80 MHz channel width, ensure minimal interference from the surroundings routers and devices.

Compatible Devices: Not every device may have the 80 MHz channel widths enabled. Older devices or those incompatible with the 802.11ac WiFi standard might not connect or benefit from the larger channel.

Channel Availability: Wider spectrum chunk is required for 80 MHz channel width. In congested or dense environments with very few free channels 80 MHz widths may not be suitable without causing interference to other networks.

With 80 MHz channel width, you will have only 2 non-overlapping channels: 42 and 155.

Optimized for High Performance

Low Interference Conditions: In low interference environments, the 80 MHz channel width will be quite helpful and able of achieving high data rates, Provides you fast-speed internet activities when other networks are not going to interfere with current channel width.

Modern Devices: Use 80 MHz for networks with modern devices that support the latest WiFi standards (802.11ac/ax), which can fully utilize the wider channels for maximum performance.

Specific 80 MHz Channel Width Scenario

High-Speed Internet and High-Bandwidth Activities: If you have devices able of streaming ultra-high-definition content or playing high-bandwidth gaming with a fast internet connection, use 80 MHz channels.

The 80 MHz channel width is supported by WiFi 5 (802.11ac) and WiFi 6 (802.11ax) devices. Due to technical reasons, for maximum performance with 80 MHz (and 160 MHz) channels, clients need to be close to the router. Typically, 80 MHz channels are also used for mesh backhaul and bridging between routers.

When to use 160 MHz channel width?

The real 160 Mhz channel-width is introduced in 802.11ac (WiFi5) and optimized in 802.11ax (WiFi6) technology, with only 1 non-overlapping channel. We should wait for the technical grow in both routers and clients to be able to use that. Read More : WiFi6 Technical Specifications.

The 160 MHz channel width is typically used in high-density environments where there are very few neighboring WiFi networks operating on the same frequency band. It allows for higher data throughput and faster wireless connections than narrower channel widths.

However, it is important to note that not all devices support 160 MHz channel width, and it requires a wide channel space to operate without causing interference to neighboring networks. Therefore, it is mainly suitable for advanced home or small business environments with few nearby Wi-Fi networks. In addition, using this channel width may reduce the range and coverage area of the wireless network. So, it is not recommended to use it in larger areas or environments where coverage is a priority.

The decision to use 160 MHz channel width should be based on factors such as the density of neighboring Wi-Fi networks, device compatibility, range requirements, and available frequency spectrum.

Summarized Table

This table simplifies the world of WiFi channels and channel width, helping you pick the perfect settings for a faster, smoother online experience.

Channel-Width	Frequency	Non-Overlapping Channels
20MHz	2.4GHz	1,6,11	High Interference Areas, Old Devices
20MHz	5GHz	36,40,44,48,149,153,157,161	High Interference Areas, Maximum Coverage
40MHz	5GHz	159,151,46,38	Low Interference Areas, Maximum Speed
80MHz	5GHz	155,42	Low Interference Areas, High Speed
160MHz	5GHz	–	Very Low Interference Areas, Ultra-High Speed

General Advice: Always monitor your network performance after changing the channel width. Tools like WiFi analyzers can help you see the impact of these changes and whether adjustments are necessary to optimize your setup. Remember, the best channel width for your needs depends heavily on your specific environment and the devices you use. Experimenting with settings and continuously monitoring performance will help you achieve the best balance of speed, reliability, and coverage.

Scenario: WiFi Channel Width Optimization in an Urban Apartment Complex

In a busy urban apartment block where many of the residents were constantly struggling with slow internet speeds, and connections random disconnection at night. The complex’s network administrator decided to do something about that and started a full optimization of all WiFi channels.

Before Optimization

Initial Setup: The routers were configured to broadcast on both 2.4GHz and 5GHz frequencies, with maximum channel width used wherever it was available.

User Complaints: Frequent buffering during streams, struggle to connect more than one device and slow internet, Residents also had difficulty working from home or even just being able enjoy content online.

Optimization Process

Channel Width Analysis: During the channel analysis, it was discovered that there is significant amount of interference on 2.4GHz band, after analyzing the network with WiFi analyzer tool, administrator identified that interferences caused by overlapping channels from neighbors’ networks.

Adjustment Implementation: The best solution for reducing the overall interference is narrowing the channel widths. For the 2.4GHz band, He used 20MHz instead of 40MHz channel width, and for 5GHz band, 40MHz channel width used instead of 80MHz. Now, we have a balance between speed and interference.

After Optimization

Improved Stability: Results showed that the stability of connection increased significantly after adjustments made by administrator. For good measure, he also used the service to stream video from a number of different sources.

Enhanced Performance: Internet speeds increased noticeably, even during peak usage times, allowing residents to enjoy every kind of multimedia services.

By carefully analyzing the existing setup and making strategic adjustments to the channel widths, the network administrator successfully enhanced the WiFi performance for the entire apartment complex, demonstrating the effectiveness of targeted WiFi optimization techniques.

Conclusion

All the channels for Wifi and it’s width Analogous to selecting the right lane on a highway for your data traffic.. Consider your devices, environment, and need for speed, then select the settings that give you the smoothest ride. Feel free to experiment and get it right for yourself. If you need help consult your internet provider or refer to the router manual. Enjoy the surf and do come back to tell if these methods proved satisfactory or not, Your share could help others in making their online surfing better!

Share Your Experience

Did you found this useful, and gain some insights in how to wifi channels work for the most optimal network performance? Maybe you just need to change your channel width or try with a new position for the router. How much your internet speed got better now or the Stability of Internet connection you feel any difference let me know. Leave a Comment Although you might have more pure experiences or tips to share in the comments section.

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WHAT IS WIFI CHANNEL AND CHANNEL WIDTH?

What is WiFi Channel and Channel Width?