Archer C7 v2 and 5GHz Transmit Power

[Lantis]

Who says it is a bug?
Regulatory rules for Finland say max of 27dB.
Find a piece of legislation that says otherwise, and present it to wireless regulatory maintainer (Seth Forshee) if you want it fixed.

Then OpenWrt can be updated to latest.

https://git.kernel.org/pub/scm/linux/ke ... b.txt#n452

[RomanHK]

Who says it is a bug?
Regulatory rules for Finland say max of 27dB.
Find a piece of legislation that says otherwise, and present it to wireless regulatory maintainer (Seth Forshee) if you want it fixed.

Then OpenWrt can be updated to latest.

https://git.kernel.org/pub/scm/linux/ke ... b.txt#n452

In this case, these pages (https://w.wol.ph/2015/08/28/maximum-wif ... r-country/) are misleading even if they are dated to 2015-08-28 and should not be pointed out as a model.
Then @ispyisail should not use the site (viewtopic.php?f=14&t=12054&p=53673#p53667) and should use the site from you.

[Lantis]

What I linked is what gets baked into the Linux kernel.
If you want to understand why something behaves in a certain way, go to the source.

People make mistakes. We are all now smarter as a community for talking about this issue.

[Oober]

Finally got response to the bug I reported:

So everything is actually OK.
____

Transmit power control (TPC) is required in this band, see [1]. Since
Linux does not implement TPC, the maximum EIRP must be reduced by 3 dBm,
so the value in the database is correct.

https://eur-lex.europa.eu/legal-content ... 3-20070213

[Oober]

Something happened recently. With 1.13.0, the maximum transmit power for 5GHz is 23 dBm also with upper channels. Is there some changes in database or in the code?

[Lantis]

You didn’t say which specific channel, but yes 23 sounds right. Maybe 27 for higher 5GHz
https://git.kernel.org/pub/scm/linux/ke ... .txt#n1013

[Oober]

Earlier, 27 dBm was maximum at channels 100, 108, 116, 124 and 132. Now, 23 dBm is maximum also at those channels (as well as at lower channels). Why?

Living in Finland and using FI location.

[Lantis]

Show

Code: Select all

iw reg get

and

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iw phy0 info

and

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iw phy1 info

[Oober]

iw reg get:

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global
country FI: DFS-ETSI
	(2400 - 2483 @ 40), (N/A, 20), (N/A)
	(5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
	(5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
	(5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
	(5725 - 5875 @ 80), (N/A, 13), (N/A)
	(57000 - 66000 @ 2160), (N/A, 40), (N/A)

phy#1
country US: DFS-FCC
	(2400 - 2472 @ 40), (N/A, 30), (N/A)
	(5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
	(5250 - 5350 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
	(5470 - 5730 @ 160), (N/A, 23), (0 ms), DFS
	(5730 - 5850 @ 80), (N/A, 30), (N/A), AUTO-BW
	(5850 - 5895 @ 40), (N/A, 27), (N/A), NO-OUTDOOR, AUTO-BW, PASSIVE-SCAN
	(57240 - 71000 @ 2160), (N/A, 40), (N/A)

phy#0
country US: DFS-FCC
	(2400 - 2472 @ 40), (N/A, 30), (N/A)
	(5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
	(5250 - 5350 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
	(5470 - 5730 @ 160), (N/A, 23), (0 ms), DFS
	(5730 - 5850 @ 80), (N/A, 30), (N/A), AUTO-BW
	(5850 - 5895 @ 40), (N/A, 27), (N/A), NO-OUTDOOR, AUTO-BW, PASSIVE-SCAN
	(57240 - 71000 @ 2160), (N/A, 40), (N/A)

iw phy0 info:

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Wiphy phy0
	max # scan SSIDs: 16
	max scan IEs length: 199 bytes
	max # sched scan SSIDs: 0
	max # match sets: 0
	max # scan plans: 1
	max scan plan interval: -1
	max scan plan iterations: 0
	Retry short limit: 7
	Retry long limit: 4
	Coverage class: 0 (up to 0m)
	Device supports AP-side u-APSD.
	Available Antennas: TX 0x7 RX 0x7
	Configured Antennas: TX 0x7 RX 0x7
	Supported interface modes:
		 * IBSS
		 * managed
		 * AP
		 * AP/VLAN
		 * monitor
		 * mesh point
		 * P2P-client
		 * P2P-GO
		 * P2P-device
	Band 2:
		Capabilities: 0x19ef
			RX LDPC
			HT20/HT40
			SM Power Save disabled
			RX HT20 SGI
			RX HT40 SGI
			TX STBC
			RX STBC 1-stream
			Max AMSDU length: 7935 bytes
			DSSS/CCK HT40
		Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
		Minimum RX AMPDU time spacing: 8 usec (0x06)
		HT TX/RX MCS rate indexes supported: 0-23
		VHT Capabilities (0x338001b2):
			Max MPDU length: 11454
			Supported Channel Width: neither 160 nor 80+80
			RX LDPC
			short GI (80 MHz)
			TX STBC
			RX antenna pattern consistency
			TX antenna pattern consistency
		VHT RX MCS set:
			1 streams: MCS 0-9
			2 streams: MCS 0-9
			3 streams: MCS 0-9
			4 streams: not supported
			5 streams: not supported
			6 streams: not supported
			7 streams: not supported
			8 streams: not supported
		VHT RX highest supported: 0 Mbps
		VHT TX MCS set:
			1 streams: MCS 0-9
			2 streams: MCS 0-9
			3 streams: MCS 0-9
			4 streams: not supported
			5 streams: not supported
			6 streams: not supported
			7 streams: not supported
			8 streams: not supported
		VHT TX highest supported: 0 Mbps
		Frequencies:
			* 5180 MHz [36] (23.0 dBm)
			* 5200 MHz [40] (23.0 dBm)
			* 5220 MHz [44] (23.0 dBm)
			* 5240 MHz [48] (23.0 dBm)
			* 5260 MHz [52] (20.0 dBm) (radar detection)
			* 5280 MHz [56] (20.0 dBm) (radar detection)
			* 5300 MHz [60] (20.0 dBm) (radar detection)
			* 5320 MHz [64] (20.0 dBm) (radar detection)
			* 5500 MHz [100] (26.0 dBm) (radar detection)
			* 5520 MHz [104] (26.0 dBm) (radar detection)
			* 5540 MHz [108] (26.0 dBm) (radar detection)
			* 5560 MHz [112] (26.0 dBm) (radar detection)
			* 5580 MHz [116] (26.0 dBm) (radar detection)
			* 5600 MHz [120] (26.0 dBm) (radar detection)
			* 5620 MHz [124] (26.0 dBm) (radar detection)
			* 5640 MHz [128] (26.0 dBm) (radar detection)
			* 5660 MHz [132] (26.0 dBm) (radar detection)
			* 5680 MHz [136] (26.0 dBm) (radar detection)
			* 5700 MHz [140] (26.0 dBm) (radar detection)
			* 5720 MHz [144] (disabled)
			* 5745 MHz [149] (13.0 dBm)
			* 5765 MHz [153] (13.0 dBm)
			* 5785 MHz [157] (13.0 dBm)
			* 5805 MHz [161] (13.0 dBm)
			* 5825 MHz [165] (13.0 dBm)
			* 5845 MHz [169] (13.0 dBm)
			* 5865 MHz [173] (13.0 dBm)
	valid interface combinations:
		 * #{ managed, P2P-client } <= 16, #{ P2P-GO } <= 3, #{ AP } <= 16, #{ IBSS } <= 1,
		   total <= 16, #channels <= 1, STA/AP BI must match, radar detect widths: { 20 MHz (no HT), 20 MHz, 40 MHz, 80 MHz }

	HT Capability overrides:
		 * MCS: ff ff ff ff ff ff ff ff ff ff
		 * maximum A-MSDU length
		 * supported channel width
		 * short GI for 40 MHz
		 * max A-MPDU length exponent
		 * min MPDU start spacing
	Supported extended features:
		* [ VHT_IBSS ]: VHT-IBSS
		* [ RRM ]: RRM
		* [ SET_SCAN_DWELL ]: scan dwell setting
		* [ CQM_RSSI_LIST ]: multiple CQM_RSSI_THOLD records
		* [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211
		* [ TXQS ]: FQ-CoDel-enabled intermediate TXQs

iw phy1 info:

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Wiphy phy1
	max # scan SSIDs: 4
	max scan IEs length: 2257 bytes
	max # sched scan SSIDs: 0
	max # match sets: 0
	max # scan plans: 1
	max scan plan interval: -1
	max scan plan iterations: 0
	Retry short limit: 7
	Retry long limit: 4
	Coverage class: 0 (up to 0m)
	Device supports AP-side u-APSD.
	Device supports T-DLS.
	Available Antennas: TX 0x7 RX 0x7
	Configured Antennas: TX 0x7 RX 0x7
	Supported interface modes:
		 * IBSS
		 * managed
		 * AP
		 * AP/VLAN
		 * monitor
		 * mesh point
		 * P2P-client
		 * P2P-GO
		 * outside context of a BSS
	Band 1:
		Capabilities: 0x11ef
			RX LDPC
			HT20/HT40
			SM Power Save disabled
			RX HT20 SGI
			RX HT40 SGI
			TX STBC
			RX STBC 1-stream
			Max AMSDU length: 3839 bytes
			DSSS/CCK HT40
		Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
		Minimum RX AMPDU time spacing: 8 usec (0x06)
		HT TX/RX MCS rate indexes supported: 0-23
		Frequencies:
			* 2412 MHz [1] (20.0 dBm)
			* 2417 MHz [2] (20.0 dBm)
			* 2422 MHz [3] (20.0 dBm)
			* 2427 MHz [4] (20.0 dBm)
			* 2432 MHz [5] (20.0 dBm)
			* 2437 MHz [6] (20.0 dBm)
			* 2442 MHz [7] (20.0 dBm)
			* 2447 MHz [8] (20.0 dBm)
			* 2452 MHz [9] (20.0 dBm)
			* 2457 MHz [10] (20.0 dBm)
			* 2462 MHz [11] (20.0 dBm)
			* 2467 MHz [12] (20.0 dBm)
			* 2472 MHz [13] (20.0 dBm)
			* 2484 MHz [14] (disabled)
	valid interface combinations:
		 * #{ managed } <= 2048, #{ AP, mesh point } <= 8, #{ P2P-client, P2P-GO } <= 1, #{ IBSS } <= 1,
		   total <= 2048, #channels <= 1, STA/AP BI must match, radar detect widths: { 20 MHz (no HT), 20 MHz, 40 MHz }

	HT Capability overrides:
		 * MCS: ff ff ff ff ff ff ff ff ff ff
		 * maximum A-MSDU length
		 * supported channel width
		 * short GI for 40 MHz
		 * max A-MPDU length exponent
		 * min MPDU start spacing
	Supported extended features:
		* [ RRM ]: RRM
		* [ CQM_RSSI_LIST ]: multiple CQM_RSSI_THOLD records
		* [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211
		* [ TXQS ]: FQ-CoDel-enabled intermediate TXQs

[Lantis]

Are you telling me that the GUI only lets you pick 23? Because from everything I see there it should let you select 26. Have you tried rebooting after setting your country code? It might still be picking up the defaults from the US.

I can’t comment on why it has changed. To reiterate from the last time you asked, we make NO changes to the transmit power. We follow the upstream regulatory database which keeps a history of all changes.
https://git.kernel.org/pub/scm/linux/ke ... log/db.txt
In recent history, FI has changed due to unification with other European country regulations.