Joined: 21 Jan 2017 Posts: 1783 Location: Illinois Moderator
Posted: Tue Sep 15, 2020 14:27 Post subject:
I have two Xiaomi MiPad 4's and they are the only devices that will operate in HT40 on 2.4ghz (Technically, so do my intel wifi cards in laptops, but you have to set them up that way in advanced settings). It seems like depending on what ROM you run and who made the device, some OEM's will enable HT40 (China doesn't seem to care about 802.11 standards all the way...); But, your results may vary and I don't know how to force HT40 on Android (root will be required for sure); forget about it on iOS.
That said, yes, HT40 works on 1x1:1 stream clients. Max speed is 150; or 200 if the client can support qam256 (only the rare qca chips will do 200, most fall back to 150).
That said, just because you connect at 150 doesn't mean you will actually get 150mbps transfer rates. You can expect best results to be 1/3 to 2/3 of that; 80mbps seems to be the real life ceiling limit.
see my signature to read more about wifi. _________________ FORUM RULES
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Tue Sep 15, 2020 19:45 Post subject:
fat channel is disabled in ddwrt when set to 40mhz (with dynamic 20/40 its enabled) on the router. stops the router from downgrading to 20mhz but wont stop any specific client. we went through hell years ago with that. (ath9k failed to stop tx dma etc) _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
Joined: 21 Jan 2017 Posts: 1783 Location: Illinois Moderator
Posted: Tue Sep 15, 2020 20:53 Post subject:
tatsuya46 wrote:
fat channel is disabled in ddwrt when set to 40mhz (with dynamic 20/40 its enabled) on the router. stops the router from downgrading to 20mhz but wont stop any specific client. we went through hell years ago with that. (ath9k failed to stop tx dma etc)
Is Fat Channel an old term used by atheros for VHT40 mode?
That is my understanding when G mode was introduced to get 108mbps... by using a 2x2:2 stream device/client _________________ FORUM RULES
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Tue Sep 15, 2020 21:05 Post subject:
msoengineer wrote:
tatsuya46 wrote:
fat channel is disabled in ddwrt when set to 40mhz (with dynamic 20/40 its enabled) on the router. stops the router from downgrading to 20mhz but wont stop any specific client. we went through hell years ago with that. (ath9k failed to stop tx dma etc)
Is Fat Channel an old term used by atheros for VHT40 mode?
That is my understanding when G mode was introduced to get 108mbps... by using a 2x2:2 stream device/client
its for N and newer, still around today. its a bit set in beacons by a client to try tell the ap "i dont use ht40, and i want u to disable ht40 on this network, even for those who do support it".
apple devices do this, and intel ones if set in settings (windows). but ap is the boss and can override it which it does, years ago it was set to obey it in driver code (hostapd setting wont work) despite user setting to h40 and not dynamic.
Joined: 21 Jan 2017 Posts: 1783 Location: Illinois Moderator
Posted: Tue Sep 15, 2020 21:36 Post subject:
For clarification purposes, when you set the router to VHT40 (Technically setting the router to Fat Channel Intolerant = disabled) you are "Forcing" the router to ignore 802.11 rules to "respect" your neighbors and pushing out a 40mhz wide signal. When you use the 20/40VHT dynamic mode, if the router "hears" neighboring routers then it won't let you do VHT40 as to be "neighbor friendly" and will only operate in HT20 mode.
As far as I know, there is no way to force an iOS device to set fat channel intolerant to disabled. On Android, some Chinese OEM's do that automatically cause they don't give an "F" about rules, on most major brands (Samsung, Google, OnePlus, Motorola, etc) they enable fat channel intolerant so you are stuck at HT20 mode in 2.4.
We're beating a dead horse here...there is nothing left to talk about on this subject. _________________ FORUM RULES
Joined: 16 Nov 2015 Posts: 6437 Location: UK, London, just across the river..
Posted: Tue Sep 15, 2020 22:35 Post subject:
on 20HT, with few clients streaming on high speed... expect a lot of lag and shit, as 20HT (G type) capacity goes away quickly, and than 40HT comes to a place, where 2.4Ghz networks can handle more traffic on N type networks...personally i prefer and always choose 40HT on channel 1,6 or 11... 5Ghz AC is shit on range, but has better capacity/bandwidth/speed..and its practically 40HT+40HT or 80HT+80HT, so if you respect the Neighbors.... buy them a cake and wine and still use 40HT..no need to struggle as they wont see any difference anyway...
for example, im here in London, in very congested area, most of the routers around(20-30) are running 2.4Ghz networks at 20/40 or 40HT all use 1,6 or 11... with my router running DDWRT, with decent settings, never had any issues or noticeable complains... _________________ Atheros
TP-Link WR740Nv1 ---DD-WRT 55630 WAP
TP-Link WR1043NDv2 -DD-WRT 55723 Gateway/DoT,Forced DNS,Ad-Block,Firewall,x4VLAN,VPN
TP-Link WR1043NDv2 -Gargoyle OS 1.15.x AP,DNS,QoS,Quotas
Qualcomm-Atheros
Netgear XR500 --DD-WRT 55779 Gateway/DoH,Forced DNS,AP Isolation,4VLAN,Ad-Block,Firewall,Vanilla
Netgear R7800 --DD-WRT 55819 Gateway/DoT,AD-Block,Forced DNS,AP&Net Isolation,x3VLAN,Firewall,Vanilla
Netgear R9000 --DD-WRT 55779 Gateway/DoT,AD-Block,AP Isolation,Firewall,Forced DNS,x2VLAN,Vanilla
Broadcom
Netgear R7000 --DD-WRT 55460 Gateway/SmartDNS/DoH,AD-Block,Firewall,Forced DNS,x3VLAN,VPN
NOT USING 5Ghz ANYWHERE
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Stubby DNS over TLS I DNSCrypt v2 by mac913
well if you live in an apartment building and have 20-30 2.4ghz wifi around you, then it is questionable why you use 2.4ghz at all
there are 2 interference-free 40mhz blocks (1-5 and 9-13)
2.4 GHz has a better material penetration - so the neighbors 2-3 floors further still interfer your wlan
as a result, there are loads of collisions and poor throughput
in the 5ghz wlan you have up to 6 interference-free 80mhz blocks depending on the region
This makes it possible in apartment building that the immediate neighbors all use different interference-free 80mhz blocks
and neighbors who are further away don't really bother you
I have at least 300 Mbit in the whole apartment and that partly through 3 walls
So the 5ghz range is not that bad, but it depends on the structural conditions
Reinforced concrete and underfloor heating provide good RF shielding
in larger apartments / single houses you have to use 2-3 5ghz routers
for that you get a fast WLAN that has no problem with 20mbit video streaming ..
Joined: 16 Nov 2015 Posts: 6437 Location: UK, London, just across the river..
Posted: Wed Sep 16, 2020 17:39 Post subject:
yep with stock router firmware, there is a lot of a drama, but with DDWRT i've never had a single complain, i can see a full speed on my ISP plans always...
for example my Intel laptop card connects at 300Mbit 2x2 when tested my routers on 1Gig pipe, i had almost 240Mbit on my 1043v2(SFE on) and 290-300Mbit on R7800 using channel 11 and 40HT short GI, short preamble, domain Canada, noise reduction, no RTS/CTS and threshold..no beam forming any kind..bacon interval set to 100...
I use 2,4Ghz only couse, its more convenient for everyone that uses my routers...and dont have a Gig pipe on my ISP contracts...anywhere...so, no need of 5ghz at the moment , at all... _________________ Atheros
TP-Link WR740Nv1 ---DD-WRT 55630 WAP
TP-Link WR1043NDv2 -DD-WRT 55723 Gateway/DoT,Forced DNS,Ad-Block,Firewall,x4VLAN,VPN
TP-Link WR1043NDv2 -Gargoyle OS 1.15.x AP,DNS,QoS,Quotas
Qualcomm-Atheros
Netgear XR500 --DD-WRT 55779 Gateway/DoH,Forced DNS,AP Isolation,4VLAN,Ad-Block,Firewall,Vanilla
Netgear R7800 --DD-WRT 55819 Gateway/DoT,AD-Block,Forced DNS,AP&Net Isolation,x3VLAN,Firewall,Vanilla
Netgear R9000 --DD-WRT 55779 Gateway/DoT,AD-Block,AP Isolation,Firewall,Forced DNS,x2VLAN,Vanilla
Broadcom
Netgear R7000 --DD-WRT 55460 Gateway/SmartDNS/DoH,AD-Block,Firewall,Forced DNS,x3VLAN,VPN
NOT USING 5Ghz ANYWHERE
------------------------------------------------------
Stubby DNS over TLS I DNSCrypt v2 by mac913