While there are performance gains to be sure (by going to 40, or 80), there are other concerns as well. We use 20 in our dorms because of the density of APs and users, we need those additional channels (even with dfs in use). We use 40 in our public spaces when there’s adequate capacity for it, and 80 in our theater area since we designed for it.
[The Culinary Institute of America] Robert Harris Manager of Network Services Culinary Institute of America 1946 Campus Drive Hyde Park, NY 845-451-1681 www.ciachef.edu<http://www.ciachef.edu/> Food is Life Create and Savor Yours.™ Please consider the environment before printing this e-mail. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Jeffrey D. Sessler Sent: Tuesday, September 26, 2017 10:20 AM To: [email protected] Subject: Re: [WIRELESS-LAN] Two RF Questions It’s surprising to me that anyone would purchase a Lamborghini, then disconnect ten of the twelve cylinders and drive it at 25 mph on the autobahn. When I see static 20 MHz channels, or using 40 MHz in only limited areas, I wonder what’s behind the purposeful neutering of the system. If you are a Cisco customer running 8.1 or above, and not using DBS (Dynamic Bandwidth Selection), then it’s the equivalent of the Lamborghini above running on only two cylinders. Don’t miss out on the significant advancements in bandwidth management. Free those resources spent doing point-in-time simulation and surveys for something the software doesn’t already do far better at. I promise, DBS won’t hurt a bit and your users will thank you a hundred times over. Jeff From: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> on behalf of "Street, Chad A" <[email protected]<mailto:[email protected]>> Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Date: Tuesday, September 26, 2017 at 6:59 AM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Re: [WIRELESS-LAN] Two RF Questions What is your reasoning behind not wanting 40 megahertz channels if you have plenty of overhead with your channel utilization? People saying you should or should not do something without Gathering any type of metric worry me. On Sep 25, 2017 3:28 PM, Chuck Enfield <[email protected]<mailto:[email protected]>> wrote: 1. Enable it in places to check for radar events. If you get few, then yes. Client devices are almost fully capable now. Hidden SSID’s are the only issue. Some clients don’t probe on DFS channels, and will only respond to beacons. Make sure 2.4 is usable for the small number of incompatible devices. 2. No. Don’t even consider 40MHz unless you’re using almost all the DFS channels, but even then you’ll probably have to disable it in some high density areas. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of David Blahut Sent: Monday, September 25, 2017 3:17 PM To: [email protected]<mailto:[email protected]> Subject: [WIRELESS-LAN] Two RF Questions Greetings, I have two hopefully simple RF related questions: 1. Should I enable the extended UNII-2 channels campus wide? 2. Should I enable 40Mhz channel width campus wide? In other words what are you doing on your campus and what is the "best practice? Our wireless infrastructure: 3 Cisco 5508s running 8.2.141.0 20 - 3800 APs 368 - 3700 APs 414 - 3600 APs 8 - 3500 APs 7 - 1810 APs 32 - 1142 APs Prime 3.1.0 Thanks for your input. David ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ________________________________ This e-mail message (including any attachments) is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this message (including any attachments) is strictly prohibited. If you have received this message in error, please contact the sender by reply e-mail message and destroy all copies of the original message (including attachments). ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss.
