Re: [WIRELESS-LAN] 802.11ac AP Deployment

[Kevin McCormick]

Cisco says to use 40 Mhz channels on 5 Ghz if you have the channels to 
support it.

We have more than enough channels in our deployments to avoid overlap, 
so we have 40 Mhz turned on.

We are also disabling 11b and 11a data rates to weed out the few slower 
older clients.

Since almost all our 5 Ghz clients are 11n or 11ac they will all take 
advantage of the 40 Mhz.

I agree with Cisco, if you can use 40 Mhz without any serious impact, 
make the change from 20 to 40.

http://www.cisco.com/web/strategy/docs/education/cisco_wlan_design_guide.pdf

Kevin McCormick
Western Illinois University

On 4/10/2015 10:31 PM, Bruce Curtis wrote:
This doc recommends 20 MHz wide channels for high density deployments but have 
40 MHz channels campus wide.  We especially wanted 40 MHz channels for large 
classrooms or auditoriums where we have 6 APs for 100 to 300 students.  (With 
2.4 GHz enabled on only 3 of the APs).

Our APs are not deployed densely enough to cause any channel overlap, even with 
40 MHz channels.

Even in our pilot project for the residence halls with an AP in every 3rd room 
(max one wall between client and AP) we don’t see any channel overlap with 40 
MHz channels.  In that building APs hear at most 1 other AP at -63 dB and the 
rest are -75 dB or lower.

We have some res hall buildings that 5 GHz travels vertically very well 
compared to horizontally.  Even in those buildings APs that are two floors 
apart hear each other at -71 dB to -76 dB.  So in those buildings we might end 
up setting the 5 GHz power down or if that does not work then we would use 20 
MHz wide channels.

https://www.wjcomms.co.uk/wp-content/uploads/2014/11/Tuning-Cisco-WLC’s-for-High-Density-Deployments-v3.pdf

On Apr 10, 2015, at 12:26 PM, Dan Brisson <dbris...@uvm.edu> wrote:

Just my 2 cents, but the "killer app" to me with 40mhz is that a client 
operating at the higher data rates means less time on channel which means better overall 
performance (lower channel utilization).

We've been doing 40mhz for a LONG time now with no noticeable issues.

-dan


Dan Brisson
Network Engineer
University of Vermont
(Ph) 802.656.8111

dbris...@uvm.edu
On 4/10/15 12:37 PM, Eric T. Barnett wrote:
All 20 MHz here. I like not having to deal with channel interference and I’m 
not seeing a “killer app” for 40 MHz.
  
Eric Barnett
Wireless Administrator
Information and Technology Services
Arkansas State University
870 680 4243
  
  
  
From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Heath Barnhart
Sent: Friday, April 10, 2015 11:10 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] 802.11ac AP Deployment
  
Ruckus R700 for the APs. I aware of the possibility of saturation, but I'd rather have the devices in place and try pulling back the transmit power than find out later I need more APs. I don't have the dimensions in front of me, but I did take that into account when planning it.

Out of curiosity how many people are running 20 Mhz channels on 5GHz?
  
--
Heath Barnhart
ITS Network Administrator
Washburn University
Topeka, KS
On Fri, 2015-04-10 at 14:38 +0000, Hinson, Matthew P wrote:
Just curious, how big are the rooms that you’re putting these in? What model 
APs, and what are the walls made of?

  

Most places I’ve seen do this end up disabling the radios on 1/3 of the APs or 
sometimes half of them to combat co-channel interference. If you aren’t using 
UNII-2e/DFS channels, you’ve only got 4 non-overlapping 40MHz channels.

  

It CAN work if your antenna selection and building layout/construction allow 
for it.

  

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Heath Barnhart
Sent: Friday, April 10, 2015 10:07 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] 802.11ac AP Deployment


  

We also have a new ResHall on the way. I'm putting an AP in every suite and 
will adjust power levels as needed. We are pulling two Cat6 to each location. 
Like many, I'm not seeing high utilization out of any of our existing APs, so 
I'm not too worried about overwhelming the link and therefore can't justify 
running Cat6a. At the moment the plan is to install Wave1 APs as well, and I'm 
staying with 40 MHz channels on 5Ghz, so the total bandwidth required would be 
below 1 Gbps anyways.

  
  
--
Heath Barnhart
ITS Network Administrator
Washburn University
Topeka, KS

On Mon, 2015-04-06 at 23:28 +0000, Doug Burke wrote:

  
  
All,
  
Last year we cabled our campus classrooms and administrative offices with CAT6a preparing for the deployment of Wav 2 802.11ac. We are about to begin Phase II of the cabling project in our residence halls and we are looking for input from others on whether to plan for one AP per room or trust our survey tools. I expect most of you will say "it depends" and we understand the complexities of building construction. We have deployed 70 Wav 1 APs as a Proof of Concept (POC) testing them in different types of building construction but would like to hear other's experiences in particular to residence halls. Thank you for your help.
  
Douglas Burke
Senior Director '13 MSEL, BSBA
Network Infrastructure Systems & Services
University of San Diego
  
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---
Bruce Curtis                         bruce.cur...@ndsu.edu
Certified NetAnalyst II                701-231-8527
North Dakota State University

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