https://devzone.nordicsemi.com/f/nordic-q-a/123844/channel-sounding-security-levelWhile checking the Channel Sounding samples, I came across the concept of Channel Sounding Security Levels . I have a few questions regarding how this is handled in Nordic’s implementation: Which Channel Sounding Security Level is currently beingen-USTelligent Community 13Fri, 22 Aug 2025 10:58:22 GMThttps://devzone.nordicsemi.com/thread/546447?ContentTypeID=1Fri, 22 Aug 2025 10:58:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0c6954a3-a6a1-40e5-8eb2-be36874e3f68Edvin<p>Ok, that makes sense. The reason I didn&#39;t find any implementation suggesting you could set this security level is because it is set automatically by the SoftDevice Controller, depending on what type of channel sounding you are doing.</p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/546432?ContentTypeID=1Fri, 22 Aug 2025 09:34:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c63788f9-4992-45dd-8db2-c475dccdfd45PaKa<p><a href="https://devzone.nordicsemi.com/f/nordic-q-a/121063/how-to-check-cs-procudure-used-by-controller-in-ble-channel-sounding-security">devzone.nordicsemi.com/.../how-to-check-cs-procudure-used-by-controller-in-ble-channel-sounding-security</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/546416?ContentTypeID=1Fri, 22 Aug 2025 08:00:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8f5499a7-6720-423c-8c75-f00e466bfd6cEdvin<p>Hello,</p> <p>Can you please provide some sources where you heard about these different security levels for channel sounding? I believe (but I could be wrong) there is only one level specifically for channel sounding, which is used for RTT. Are you sure the security level 3 and 4 that you speak of are not the security level of the BLE connection itself?</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>