2021-12-06 06:45:50

by Sultan Alsawaf

Subject: [PATCH] wireless-regdb: Raise DFS TX power limit to 250 mW (24 dBm) for the US

From: Sultan Alsawaf <[email protected]>

According to 47 CFR § 15.407(a)(2), the U-NII-2A (5.25-5.35 GHz) and
U-NII-2C (5.47-5.725 GHz) DFS bands are subject to the following [1]:
"For the 5.25-5.35 GHz and 5.47-5.725 GHz bands, the maximum conducted
output power over the frequency bands of operation shall not exceed
the lesser of 250 mW or 11 dBm + 10 log B, where B is the 26 dB
emission bandwidth in megahertz."

As such, increase the TX power limit for the U-NII-2A and U-NII-2C DFS
bands to 250 mW (24 dBm) to match the FCC's current rules. These power
limits have remained unchanged since the § 15.407 amendment by the FCC
in 2014 [2].

[1] https://www.ecfr.gov/current/title-47/chapter-I/subchapter-A/part-15/subpart-E/section-15.407#p-15.407(a)(2)
[2] https://www.federalregister.gov/d/2014-09279/p-131

Signed-off-by: Sultan Alsawaf <[email protected]>
---
db.txt | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/db.txt b/db.txt
index 6e8dbef..b898799 100644
--- a/db.txt
+++ b/db.txt
@@ -1596,12 +1596,12 @@ country US: DFS-FCC
(2400 - 2472 @ 40), (30)
# 5.15 ~ 5.25 GHz: 30 dBm for master mode, 23 dBm for clients
(5150 - 5250 @ 80), (23), AUTO-BW
- (5250 - 5350 @ 80), (23), DFS, AUTO-BW
+ (5250 - 5350 @ 80), (24), DFS, AUTO-BW
# This range ends at 5725 MHz, but channel 144 extends to 5730 MHz.
# Since 5725 ~ 5730 MHz belongs to the next range which has looser
# requirements, we can extend the range by 5 MHz to make the kernel
# happy and be able to use channel 144.
- (5470 - 5730 @ 160), (23), DFS
+ (5470 - 5730 @ 160), (24), DFS
(5730 - 5850 @ 80), (30), AUTO-BW
# https://www.federalregister.gov/documents/2021/05/03/2021-08802/use-of-the-5850-5925-ghz-band
# max. 33 dBm AP @ 20MHz, 36 dBm AP @ 40Mhz+, 6 dB less for clients
--
2.34.1

2021-12-10 02:47:12

by Seth Forshee

Subject: Re: [PATCH] wireless-regdb: Raise DFS TX power limit to 250 mW (24 dBm) for the US

On Sun, Dec 05, 2021 at 10:45:20PM -0800, Sultan Alsawaf wrote:
> From: Sultan Alsawaf <[email protected]>
>
> According to 47 CFR § 15.407(a)(2), the U-NII-2A (5.25-5.35 GHz) and
> U-NII-2C (5.47-5.725 GHz) DFS bands are subject to the following [1]:
> "For the 5.25-5.35 GHz and 5.47-5.725 GHz bands, the maximum conducted
> output power over the frequency bands of operation shall not exceed
> the lesser of 250 mW or 11 dBm + 10 log B, where B is the 26 dB
> emission bandwidth in megahertz."
>
> As such, increase the TX power limit for the U-NII-2A and U-NII-2C DFS
> bands to 250 mW (24 dBm) to match the FCC's current rules. These power
> limits have remained unchanged since the § 15.407 amendment by the FCC
> in 2014 [2].
>
> [1] https://www.ecfr.gov/current/title-47/chapter-I/subchapter-A/part-15/subpart-E/section-15.407#p-15.407(a)(2)
> [2] https://www.federalregister.gov/d/2014-09279/p-131
>
> Signed-off-by: Sultan Alsawaf <[email protected]>

Applied, thanks!