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X-MS-Exchange-CrossPremises-SCL: 1 X-MS-Exchange-CrossPremises-Processed-By-Journaling: Journal Agent X-OrganizationHeadersPreserved: PR3P192MB0896.EURP192.PROD.OUTLOOK.COM X-Proofpoint-ORIG-GUID: 2IawQItnKFHP60FpCtTm9GSKVzSWt_-y X-Proofpoint-GUID: 2IawQItnKFHP60FpCtTm9GSKVzSWt_-y X-Authority-Analysis: v=2.4 cv=LINmQIW9 c=1 sm=1 tr=0 ts=682701e9 cx=c_pps a=6Hn8pli4REgfWvaJFfKueQ==:117 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=dt9VzEwgFbYA:10 a=8gLI3H-aZtYA:10 a=N9GNhs4bAAAA:8 a=EDG_nEDfII5wme-T6BkA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=PZhj9NlD-CKO8hVp7yCs:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTE2MDA4NyBTYWx0ZWRfX5+oaHet4KPyu /+qnq72BsxbCNBxb47VhODnWtPYPZBO6KcO32MwyXdeCk6LXnNLTNiEPWgXugUCG9K8YELZTF7D GvFGuVwfjuuVHyF487hy6GZ5HU1aJWbo+sDHVv70cyoEAMqlqk9kysNqZantWyEc76DZAmSBj1D dnav68mqJXsTTnFGyi3EAjOx6U0O5f6wzQrpR3pDdx43UnlEIFQacrcbYr1A303mWQINahli4kV tV1bBMcuMbfAzeVCyDn3HMcJXqHWNR/3moOaHZY1L6M+SM/lrNaWXl0h7ho4Po5QGHkrta+C8Af eEdSxJbk8YI+VStn4kxZzM3TFMMCJuMlIMPTUTeNBBRNL1XGi8DfC7LB8PXPcpnIQiLMxF3XU2m CU6HDCRHkXBxnpM8f4iQ8YM8RY6W5CtNHN7eRuIOOVPHGtQJ0CJbnwfcew4CpxiDNpmtgYDU Am Fri, May 16, 2025 at 04:15:40PM +0800 schrieb Chen-Yu Tsai: > On Thu, May 8, 2025 at 1:25 AM Alexander Wilhelm > wrote: > > > > Hello devs, > > > > please correct me if I'm wrong. Since TPC is not used, the EU Rules dictates to > > decrease the transmit power by 3 dBm on some sub-bands. For the most of the EU > > countries the mW instead of dBm is used. Therefore they are halved (e.g for > > Germany (DE) in commit 81d251dda3985e1088bd89f5d9f565e63ba5a30f). The problem is > > that the values are then converted to dBm and rounded down and result in a wrong > > supported value. Take a look at example (Germany again): > > > > country DE: DFS-ETSI > > (2400 - 2483.5 @ 40), (100 mW) > > (5150 - 5250 @ 80), (200 mW), NO-OUTDOOR, AUTO-BW, wmmrule=ETSI > > (5250 - 5350 @ 80), (100 mW), NO-OUTDOOR, DFS, AUTO-BW, wmmrule=ETSI > > (5470 - 5725 @ 160), (500 mW), DFS, wmmrule=ETSI > > # short range devices (ETSI EN 300 440-1) > > (5725 - 5875 @ 80), (25 mW) > > # WiFi 6E > > (5945 - 6425 @ 320), (23), NO-OUTDOOR, wmmrule=ETSI > > # 60 GHz band channels 1-4 (ETSI EN 302 567) > > (57000 - 66000 @ 2160), (40) > > > > For the frequencies 5250 - 5350 the power of 100 mW results it 20 dBm. Correct. > > The frequencies 5470 - 5725 have a power of 500 mW. It results in 26 dBm. But I > > believe 27 dBm are allowed. For the frequncies 5725 - 5875 the value of 25 mW is > > also dictated. I'm not sure if I should expect 14 dBm, but I get 13 dBm. > > Are you reading the converted numbers from the system, not the database > text file? >From the system itself. I'm using the 'iw phy info' tool. Regards Alexander Wilhelm > > > Is there inconsistencies between dBm/mW conversions? Please give me a feedback. > > The conversions don't always produce round numbers, and since we can't let > the system exceed the _actual_ limit, the values can only be rounded down. > For example, 500 mW converts to roughly 26.9897 dBm. We can't use 27 dBm, > since if the system outputs at 26.999 dBm, it would be in violation of > the rules. > > Or, if we understand 3 dBm reduction to be halving the power, we could > fix up any rules that "have their base limit in mW and were converted to > dBm to apply the reduction" be rewritten in mW with the numbers halved. > That would require someone to go through the entries though. But if > the rules are already written in mW, and what you observe is the kernel > rounding down the numbers, then perhaps the kernel may need to support > both units. > > > Thanks > ChenYu