We’re running a 20MHz channel plan due to our AP density (one per classroom), over summer I’m going to look at enabling 40MHz in the less-dense non-teaching areas. Whenever I try out DFS channels they always get radared out within a day.
While troubleshooting a performance issue recently I was trying out a 40MHz channel width and noticed it was a lot noisier outside the channel bands: [cid:[email protected]] Picture from Chanalzyer Pro with a Wi-Spy DBx. So that’s another reason to avoid 40MHz channels unless you actually get out there and check the RF to confirm your channel plan works in practice. As for dual-radio 5GHz APs, I still think they’re stupid and vendors should be making single-radio 5GHz APs. OK, some already do, but they’re low-performance (2x2), not high-end (4x4). A single-radio 5GHz AP will fit within 802.3af even at 4x4, won’t have internal interference, and will allow better AP positioning. Yes, you do need to run an extra cable (although not if you’re already using dual-radio APs with 2.4GHz turned off), and it’ll still use a full AP license, but at least give us that option *gets off hobby horse*. -- James Andrewartha Network & Projects Engineer Christ Church Grammar School Claremont, Western Australia Ph. (08) 9442 1757 Mob. 0424 160 877 From: The EDUCAUSE Wireless Issues Constituent Group Listserv <[email protected]> on behalf of "Trinklein, Jason R" <[email protected]> Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv <[email protected]> Date: Wednesday, 30 November 2016 at 5:35 am To: "[email protected]" <[email protected]> Subject: [WIRELESS-LAN] 5GHz Channel Width Hi All, I was just reading a blog article that heavily recommends not to use 40Mhz channel width in multi-floor environments, particularly where many 5GHz radios are used (particularly in our case with Xirrus multi-radio APs). Our campus presently uses 20MHz channel width in all buildings. We are testing and considering 40MHz width because of the bandwidth benefits for clients. What do you use on your campus? Have you found that setting a 40MHz channel width on your 5GHz radios has caused too much interference? Here is the article: http://divdyn.com/dual-5ghz-radio-aps/ Your thoughts are appreciated. -- Jason Trinklein Wireless Engineering Manager College of Charleston 81 St. Philip Street | Office 311D | Charleston, SC 29403 [email protected]<mailto:[email protected]> | (843) 300–8009 ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
