Hi Donald,

I’m not quite following the questions. Where we are very dense and likely to 
risk channel overlap with 40, we use 20. Examples- our stadium, dense 
residential environments, very RF porous buildings that are also dense. In 5 
GHz, we *generally* let RRM pick channel, but often overrule it on power. Most 
max power differences allowed across the individual 5 GHz channels don’t come 
into play in our *generally* low-power cells. And we are not yet using DFS 
channels whole-hog, but do have pilot spaces in use.

Our way certainly isn’t the only way, but has proven reliable for us over time.

-Lee

Lee Badman | CWNE #200 | Network Architect

Information Technology Services
206 Machinery Hall
120 Smith Drive
Syracuse, New York 13244
t 315.443.3003   f 315.443.4325   e lhbad...@syr.edu<mailto:lhbad...@syr.edu> w 
its.syr.edu
SYRACUSE UNIVERSITY
syr.edu

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Donald Ambrose
Sent: Wednesday, November 30, 2016 7:24 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] 5GHz Channel Width

Any advice on manually setting up the 5 Ghz channels? Also I would like to use 
the DFS channels so that I can get a wider range to choose from. But I have 
noticed that the wattage correspond to the channel I choose in this band .So 
would it be advisable to use two 165s close enough or should I design the 
channel selection keeping the distance into consideration as well.

Thanks
Donald Ambrose

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Lee H Badman
Sent: Tuesday, November 29, 2016 7:58 PM
To: 
WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>
Subject: Re: [WIRELESS-LAN] 5GHz Channel Width

20 in our dense spaces, 40 where it can be done safely- about 50/50.

Lee Badman (mobile)

On Nov 29, 2016, at 6:09 PM, Jason Cook 
<jason.c...@adelaide.edu.au<mailto:jason.c...@adelaide.edu.au>> wrote:
It all comes down to requirements & design, if you can have 0 channel overlap 
while using 40Mhz then go for it… This is likely to be quite a challenge in 
multi-floor environments. Using tools like Ekahau Site Survey and Airmagnet 
survey will help design and verify these installs.

We went from 20 to 40 a few years back, but move back to 20 by default early 
last year. We have a few 40Mhz locations where we can, we could probably do a 
lot more but unless we have time to design and test we leave things at 20.

Here’s come CWNE’s talking about it
https://vimeo.com/158370545
Starts 27:50
Though the rest of the video is pretty interesting too


--
Jason Cook
Technology Services
The University of Adelaide, AUSTRALIA 5005
Ph    : +61 8 8313 4800

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Trinklein, Jason R
Sent: Wednesday, 30 November 2016 8:05 AM
To: 
WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>
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
trinkle...@cofc.edu<mailto:trinkle...@cofc.edu> | (843) 300–8009
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