No, because each client has to use at least the primary 20 MHz channel and optionally any secondary 20 MHz channels. So as each client has to wait its turn to use the primary channel it makes no difference if the clients are using a bandwidth of 20, 40 or 80 MHz.Given a router 5.0 WLAN set to 20/40/80 MHz bandwidth, does a client connecting a 40 MHz affect/limit clients that can connect at 80 MHz?
No, because each client has to use at least the primary 20 MHz channel and optionally any secondary 20 MHz channels. So as each client has to wait its turn to use the primary channel it makes no difference if the clients are using a bandwidth of 20, 40 or 80 MHz.
Also bear in mind that all the 20/40/80 setting does is allow the router to chose which of those 3 bandwidths it will use at startup. So if it chooses 80 MHz it will stay at 80 MHz (ignoring DFS actions). In other words 20/40/80 isn't some sort of magic mode that lets the router or clients dynamically change their bandwidth settings on the fly.
This isn't necessarily true.Also bear in mind that all the 20/40/80 setting does is allow the router to chose which of those 3 bandwidths it will use at startup. So if it chooses 80 MHz it will stay at 80 MHz (ignoring DFS actions). In other words 20/40/80 isn't some sort of magic mode that lets the router or clients dynamically change their bandwidth settings on the fly.
So dynamic channel allocation is part of 802.11ac. Whether it is actually implemented in most products is another discussion entirely. I know years ago Qualcomm was touting it in their marketing material. But, again, whether it is used in the real world is another thing. You'd have to do packet sniffing to tell.On the other hand, 802.11ac allows per-frame channel width and bandwidth signaling.
I could well be wrong but was interpreting that in a different way. The "20/40/80" setting I was referring to is specifically the option shown in the router's config, which I think is something different than "dynamic per-frame channel width".This isn't necessarily true.
From your Revolution WiFi link
So dynamic channel allocation is part of 802.11ac. Whether it is actually implemented in most products is another discussion entirely. I know years ago Qualcomm was touting it in their marketing material. But, again, whether it is used in the real world is another thing. You'd have to do packet sniffing to tell.
Interesting threadThanks All, for the feedback! I need to study up. There seem to be many considerations, subject to who implements what with what generation of 802.11.
Since my remote AC86U died and dismantled my AiMesh, I have replaced it with an N66U in Media Bridge Mode connecting at 5.0 ~450 Mbps -73 dBm more or less depending on where you look (77' through some brick walls, etc.). Its Wireless Log suggest this link is using 40 MHz bandwidth where as the AC86U main router is set for 20/40/80 MHz. Hence, my bandwidth questions.
I wired an OBi202 ata to the N66U, so that is back in service.
And I wired a dual-band Wireless-N Linksys E3200 router in Bridge Mode (only option) to the N66U, 1 Gbps WAN-to-LAN, to serve as a remote AP. The E3200 WLANs are set for OE-50 40 MHz (max option) and OE-24 20 MHz, same different SSIDs as on the router but on different channels from the router.
If the router is using 5.0 ch 157 at 80 MHz, can the AP use ch 149 at 40 MHz, or should I move the AP off the 149-161 block of channels?
For reference:
View attachment 25277
Now to go out and test it... erector set networking!
OE
N66U... Its Wireless Log suggest this link is using 40 MHz
Hence, my bandwidth questions.
I have been preferring these channels for highest power in the US
If I may take this a step further and not off topic, take a N Client that hops on your 5 ghz network cause it’s set to 20/40/80, wouldn’t changing the 5.0 to 80 only force that N Client to the 2.4 network since it can’t use higher than the 40 anymore.@ColinTaylor The 20/40/80 bandwidth settings determine the maximum bandwidth used when transmitting. Dynamic bandwidth allocation then occurs (or doesn't, depending on what the product supports) within those bounds.
@OzarkEdge As @Pork noted, 5 GHz Tx power limits were changed a few years ago to allow the max power on all channels in the U.S.
@K-2SO Slower devices take more airtime, so can slow down faster ones, yes. Channel bandwidth is only one factor determining Tx airtime. Others are signal level, Wi-Fi standard supported, MU-MIMO and now OFDMA.
That said, routers have gotten better at allocating bandwidth among different "speed" devices. Some implement airtime fairness techniques to prevent slower devices from dominating air time.
Others are signal level, Wi-Fi standard supported, MU-MIMO and now OFDMA.
wouldn’t changing the 5.0 to 80 only force that N Client to the 2.4 network
How can it connect on the 40 if it is set to 80 only. That’s the point of having that choice isn’t it.You know some of those are best for marketing purposes only. I've never seen any real life benefits of Beamforming and MU-MIMO. You can only measure small % differences with the pro equipment you test with. Airtime is the most limiting factor even in ideal conditions. Multiple APs come to rescue when many devices compete for airtime.
No. The N client will still connect at 40MHz channel. My network is set to 80MHz channel and I have few N clients on 5GHz, for example.
How can it connect on the 40 if it is set to 80 only. That’s the point of having that choice isn’t it.
So setting it to 80 only is the same as 20/40/80 because that’s up to 80 too. I’m so confused hahaha. I thought the point of being able to pick on versus the group was so you could eliminate the slower ones and make them use the high speed and not drop backBecause it's not 80MHz only, but up to 80MHz. @ColinTaylor explained what it means above.
@OzarkEdge As @Pork noted, 5 GHz Tx power limits were changed a few years ago to allow the max power on all channels in the U.S.
Yes that was my understanding. The confusion for Asus users is that in addition to the bandwidth cap settings of "20", "40" and "80" there is another setting called "20/40/80" the effect of which is not obvious.@ColinTaylor The 20/40/80 bandwidth settings determine the maximum bandwidth used when transmitting. Dynamic bandwidth allocation then occurs (or doesn't, depending on what the product supports) within those bounds.
Router setting Broadcom bw_cap value
20 20MHz
40 20/40MHz
80 20/40/80MHz
20/40/80 sets the value to 20/40MHz or 20/40/80MHz depending on capabilities
of router and turns on OBSS Coexistence.
No that's not the point. As Tim said you are setting a cap on the maximum bandwidth, you're not limiting the minimum bandwidth.How can it connect on the 40 if it is set to 80 only. That’s the point of having that choice isn’t it.
So setting it to 80 only is the same as 20/40/80 because that’s up to 80 too.
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