Hi there, we have a potential BIG customer who is disappointed because they cannot use UNII-2 & UNII-2 extended 5GHz channels. They are wondering why indoor APs are not able to select these channels. Could you please explain the reason behind this limitation? (Please tell me if i am overlooking a simple setting)
Within Europe, the usage of UNII-2 and UNII-2 extended channels for Wi-Fi networks is permitted under certain conditions. These channels are legal and can be utilized when the Wi-Fi chipset used in the device has been verified to comply with European regulations.
The UNII-2 band covers channels 52-64 and 100-140 in the 5GHz frequency range, while the UNII-2 extended band extends from channels 100-140. These channels provide additional spectrum for Wi-Fi networks, enabling higher throughput and reduced interference.
However, it’s important to note that the usage of UNII-2 and UNII-2 extended channels is subject to Dynamic Frequency Selection (DFS) requirements. DFS is a mechanism implemented in Wi-Fi devices to detect and avoid interference with radar systems operating in the same frequency range. The DFS functionality allows the Wi-Fi device to monitor the channel for radar signals and, if detected, automatically switch to a different channel to avoid interference.
To ensure compliance with European regulations, Wi-Fi chipsets used in devices must undergo a verification process. This process involves testing and certification to demonstrate that the chipset meets the required technical specifications, including DFS capabilities. Once the chipset has been verified, devices incorporating that chipset can legally operate on UNII-2 and UNII-2 extended channels within Europe.
It’s worth noting that the specific regulations and requirements for UNII-2 and UNII-2 extended channels may vary between countries within Europe. Therefore, it is essential to consult the local regulatory authorities or relevant industry organizations to ensure compliance with the legal requirements and chipset verification processes in a specific European country.
In summary, UNII-2 and UNII-2 extended channels are legally usable in Europe when the Wi-Fi chipset used in the device has been verified to comply with European regulations. Compliance with Dynamic Frequency Selection (DFS) requirements is essential to avoid interference with radar systems. However, it’s crucial to verify the specific regulations and chipset verification processes in the respective European country for accurate and up-to-date information.
It’s important to note that not all Wi-Fi devices are compatible with the UNII-3 band, which can limit their capability in dense network environments. The UNII-3 band consists of channels 149-165 in the 5GHz frequency range. While the UNII-1 band (channels 36-48) is commonly used and widely supported by most Wi-Fi devices, relying solely on the UNII-1 band may not be sufficient in densely populated areas or environments with high Wi-Fi usage.
In dense situations, such as crowded urban areas, office buildings, or venues with numerous Wi-Fi networks, the available spectrum in the UNII-1 band can become congested and lead to reduced network performance. This congestion can result in increased interference and slower data speeds for users.
In summary, relying solely on the UNII-1 band may not be sufficient in dense network situations. The UNII-3 band provides additional channels that can alleviate congestion and reduce interference. However, it’s important to note that not all Wi-Fi devices support the UNII-3 band, which can limit their effectiveness in densely populated areas.
