I think he is talking about using 40MHz channels on the older M series, that didn't have gig ports. It was my understanding that the processor would get taxed as well on a 40MHz channel, making 30MHz actually work better.
On Mon, Jun 8, 2015 at 9:24 AM, Josh Luthman <j...@imaginenetworksllc.com> wrote: > Ubnt and epmp have gig ports. > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > On Jun 8, 2015 11:20 AM, "Josh Reynolds" <j...@spitwspots.com> wrote: > >> I don't know how epmp does it. >> >> For UBNT, a 30mhz channel is just a "fat" 20mhz channel in the atheros >> chip. Single operation. For a 40mhz channel, it's really two 20s, meaning >> radio operations are ran twice. Loss in efficiency, also marred by the lack >> of gigabit port. >> On Jun 8, 2015 7:13 AM, Mathew Howard <mhoward...@gmail.com> wrote: >> >> 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 >> >> >>
