Rather than just making fun of the stupid suggestion, it’s probably worth explaining what makes it stupid.
Back in the days of the 4-channel model all we cared about was throughput. Bandwidth was hard to come by, and maximizing it was beneficial. Figuring out which was better was easy. 4 channels gave you 33% more air time. If adding the fourth channel to your plan increased retries by less than 33%, you gained bandwidth. You could test it in your production network and easily measure the difference. I’ve tested it and it worked sometimes and didn’t work others. What determined the success was the AP layout and how they were channelized. If the AP density wasn’t too high (APs 80” to 100’ apart were common back then) and you carefully set your channels then 4 channels increased bandwidth. Switch to today. Is anybody manually choosing their channel plan? If not, is your automated radio management systems designed for this? I’m pretty sure the answer to both is “No.” Furthermore, we now have lots of real-time voice and video traffic on Wi-F that we didn’t have in the 11b days. (Yes there were wi-fi phones back then, but they sucked and you better not have many of them.) Today, retries affect service quality beyond just the airtime they use. Doing anything that’s likely to increase retries, even a little, is going to have a disproportionate impact on real-time service quality. Increasing bandwidth isn’t sufficient to make better Wi-Fi anymore. From: The EDUCAUSE Wireless Issues Community Group Listserv <[email protected]> On Behalf Of Dan Lauing Sent: Wednesday, August 26, 2020 12:45 PM To: [email protected] Subject: Re: [WIRELESS-LAN] [EXT] Re: [WIRELESS-LAN] 2.4Ghz channel designations I believe the basis for his idea is that, because 802.11 clients are far more sensitive to other 802.11 clients as opposed to noise, it's better to have those extra channels, whose overlapping channels would sound like noise to clients not on that specific channel. I am not saying I agree with this, haha. On Wed, Aug 26, 2020 at 11:44 AM Matt Wierzgac <[email protected]<mailto:[email protected]>> wrote: I echo Seth’s statement. Utilize the 5GHz radio for dense deployments, and shut down the 2.4GHz radios on AP’s where needed, and utilize the 3 channel plan. Thanks, Matt Wierzgac Engineering Manager phone: 248-378-1125 mobile: 248-504-8096 [facebook icon]<https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.facebook.com%2Fpg%2FWZCNetworkingLLC&data=02%7C01%7Ccae104%40PSU.EDU%7C8d16a00232d24cecd36308d849df7445%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C0%7C637340571374691778&sdata=%2FsuWPo96sUhJP0C5YdSu2Jwa9km7ROX35M7M8hNzRwo%3D&reserved=0>[twitter icon]<https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftwitter.com%2Fwzcnetworking&data=02%7C01%7Ccae104%40PSU.EDU%7C8d16a00232d24cecd36308d849df7445%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C0%7C637340571374701769&sdata=IJ0LJZ7YOHetjGjahuLWE4JhFwC64jwkbaim818Q77c%3D&reserved=0>[linkedin icon]<https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fwzc-networking-llc&data=02%7C01%7Ccae104%40PSU.EDU%7C8d16a00232d24cecd36308d849df7445%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C0%7C637340571374701769&sdata=MxIDsmtfV%2BquWZStdz3hDJovbiBxvCJfqYjq7EOJUt4%3D&reserved=0> [logo]<https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.wzcnetworking.net%2F&data=02%7C01%7Ccae104%40PSU.EDU%7C8d16a00232d24cecd36308d849df7445%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C0%7C637340571374711762&sdata=M%2BaouED7pecbj%2FINMCvazCskRZfX80dcCoe2Q%2FAIp%2F8%3D&reserved=0> 24371 Catherine Industrial Dr. Suite 225 Novi, MI 48375 www.wzcnetworking.net<https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.wzcnetworking.net%2F&data=02%7C01%7Ccae104%40PSU.EDU%7C8d16a00232d24cecd36308d849df7445%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C0%7C637340571374711762&sdata=wCnTrzenpx53%2FriBZugwYOREKesWdWbJzsMdz5MZD4Q%3D&reserved=0> From: The EDUCAUSE Wireless Issues Community Group Listserv <[email protected]<mailto:[email protected]>> On Behalf Of Seth Bean Sent: Wednesday, August 26, 2020 12:25 PM To: [email protected]<mailto:[email protected]> Subject: Re: [WIRELESS-LAN] [EXT] Re: [WIRELESS-LAN] 2.4Ghz channel designations I briefly tried the 4 channel (1,4,7,11) plan and it was awful. I have found shutting off the 2.4 radio in dense environments works in a 3 channel plan. Seth Bean Administrator of Networks and Telecommunications MCLA APA Chapter President Massachusetts College of Liberal Arts 413.662.5022 413.663.1276 375 Church Street North Adams, MA 01247 “National Top Ten Public Liberal Arts College” 2019 US News & World Report MCLA ________________________________ From: The EDUCAUSE Wireless Issues Community Group Listserv <[email protected]<mailto:[email protected]>> on behalf of SWARTZ, POLA <[email protected]<mailto:[email protected]>> Sent: Wednesday, August 26, 2020 12:18:24 PM To: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Subject: Re: [WIRELESS-LAN] [EXT] Re: [WIRELESS-LAN] 2.4Ghz channel designations CAUTION: This email originated from outside of MCLA. Do not click links or open attachments unless you recognize the sender and know the content is safe. 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Integrity . Equity. Collaboration. Accountability . Fun Never out smart your common sense... ________________________________ From: The EDUCAUSE Wireless Issues Community Group Listserv <[email protected]<mailto:[email protected]>> on behalf of Brady J. Ballstadt <[email protected]<mailto:[email protected]>> Sent: Wednesday, August 26, 2020 10:15 AM To: [email protected]<mailto:[email protected]> Subject: [EXT] Re: [WIRELESS-LAN] 2.4Ghz channel designations Find a new consultant. Brady Ballstadt From: The EDUCAUSE Wireless Issues Community Group Listserv <[email protected]<mailto:[email protected]>> on behalf of John Rodkey <[email protected]<mailto:[email protected]>> Reply-To: The EDUCAUSE Wireless Issues Community Group Listserv <[email protected]<mailto:[email protected]>> Date: Wednesday, August 26, 2020 at 11:13 AM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: [WIRELESS-LAN] 2.4Ghz channel designations For many years I have consistently used channels 1, 6, and 11 as non-overlapping channels wherever 2.4Ghz is deployed. I have a consultant who is suggesting using all 11 channels in our high density dorm situations, arguing that signal interference will affect throughput less than the delays from protocols where the 3 channels are within hearing distance of each other. This doesn't make sense to me. 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