We’ve used all of the bands including UNII-2 (DFS) for over six years, and our default is 40 Mhz width. There were some clients that had problems with the UNII-2 bands (older Intel radios), but the Mac’s seemed AOK. Today, pretty much everything should be OK with those bands.
On the Cisco side of the house, the channel width is less of an issue today (deciding what to do) as you have Dynamic Bandwidth Selection (DBS) where as an extension of the RRM (radio resource management) the the AP’s can dynamically alter their channel-width based on a number of factors. Jeff On 3/15/16, 7:55 AM, "The EDUCAUSE Wireless Issues Constituent Group Listserv on behalf of Steve Bohrer" <[email protected] on behalf of [email protected]> wrote: >Last April in >http://listserv.educause.edu/scripts/wa.exe?A2=WIRELESS-LAN;57305dd0.1504 >"802.11ac AP Deployment," several respondents say they use 40 MHz channel >width campus wide. Some noted that the ac standard provides for dynamic >switching back and forth to 20 MHz, so interference is less of an issue. > >But, those respondents didn't mention if they were using only the U-NII-1 and >U-NII-3 bands, or if they are also using the bands that require DFS, U-NII-2 >and/or -2e . > >Is there any consensus or best practice on this? Is anyone using -2 and -2e, >or just staying with four non-overlapping 40 MHz 5 GHz channels? Are most >current clients able to connect to the DFS channels? > >Aruba's "RF and Roaming Optimization for Aruba 802.11ac Networks" doc ( >http://community.arubanetworks.com/t5/Validated-Reference-Design/RF-and-Roaming-Optimization-for-Aruba-802-11ac-Networks/ta-p/227716 > ) says that: > >"Majority of voice specific devices do not scan many channels before roaming >as they have active voice calls. For such devices, do not use U-NII-2 and >U-NII-2e channels." > >and > >"Roaming test should be performed using different types of clients expected on >the WLAN, to see their behavior on DFS channels." > >So, that sounds like a "no" vote on DFS, though we don't have wifi VoIP >phones. Does any one have field experience and recommendations? Any guesses if >DFS channels will ever be useable with a student BYO client base? > >Thanks, >Steve Bohrer >Network & Security Admin >IT Infrastructure, Emerson College >617-824-8523 >********** >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/.
