I've never seeing much difference in performance on the ubnt M series between 30mhz and 40mhz channels, so yes, I would say that is true... but I'm not sure how much applies to ePMP - they do have a much a faster processor and on a software level they are very different.
So far, I have been running all of our ePMP APs on 20mhz channels and PTP links on 40mhz or 20mhz, depending on how much capacity they need. I haven't really seen much need to go down to 10mhz channels with ePMP. On Mon, Jun 8, 2015 at 8:43 AM, Shayne Lebrun <sleb...@muskoka.com> wrote: > I seem to recall that with the M series, at least, a 30 mhz channel works > 'better' than a 40 because the 40 is really two 20 mhz channels bonded > together, where a 30 mhz channel is a 30 mhz channel. > > -----Original Message----- > From: Af [mailto:af-boun...@afmug.com] On Behalf Of Rory Conaway > Sent: Saturday, June 6, 2015 8:32 PM > To: af@afmug.com > Subject: Re: [AFMUG] EPMP 10 mhz vs 20mhz > > I'm not that familiar with the ePMP's yet but I can tell you some things > that we saw with Ubiquiti. One is that channel width does not scale with > bandwidth that that Atheros chipset. For example, 40MHz channels rarely > hit their theoretical maximum due to a variety of factors, noise, lower > s/n, processor limitations, etc... Second, 20MHz channels seem to be the > sweet spot but even with GPS sync, you have to deal with reflections. > Third, 10MHz channels have more overhead as a percentage of total capacity > and don't handle a lot of users well (above 40 for example with the older > 400MHz chipsets. I'm starting to deploy XW radios with the 520MHz > processors but everything is 20MHz now so I don't have a comparison). We > did see peaks of 32Mbps with some customers on 10MHz channels but that's > non-peak times. In peak times, we were seeing 8Mbps when more users were > online. > > Rory > > > -----Original Message----- > From: Af [mailto:af-boun...@afmug.com] On Behalf Of Craig House > Sent: Saturday, June 06, 2015 5:20 PM > To: af@afmug.com > Subject: [AFMUG] EPMP 10 mhz vs 20mhz > > We have deployed 6 towers to begin our new EPMP network and 4 of those > towers have a full cluster of 2.4 90 degree EPMP sectors. They are > configured with ACS turned off now because in several cases they all ended > up on the same or very close to the same channel. I have Front back > designations and non overlapping channels set up on all towers. I have > tried 40 mhz 20 mhz and now 10mhz channels and while the customer stability > has gotten better the more I play with settings I have kind of hit a point > I dont know what else to try. I have some that the uplink quality will > vary wildly from 100% to 0%. Most have gotten better since I went to a > 10mhz channel. Most of the customers get 12MB -30mb down in the wireless > link test but the uplinks are as bad as .17. What is the cause of this > poor uplink quality? Is it interfernece? My one 5ghz AP does not have > this problem but even with noise many of these customers have -50 signals > and oddly enough the ones with the great signals seem to be the ones that > have the poorest link tests on the up link side. I also have customes with > -65 or -72 signals that get 5MB up on the same sectors? Im scratching my > head a bit on what the fix is for this? Should I leave ACS on and change > everything to 10mhz channels? Will a full cluster with ACS on work all on > the same channel? > I'm used to FSK where you pick your channel and any channels that are > adjacent will cause problems with connected SM's. So am I just applying > old knowledge to a technology that it doesn't apply to? > > Craig > >
