[AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization
I have a couple 450 APs showing relatively low traffic (20mbps) but 100% downlink frame utilization on a 20mhz channel. I've seen this AP do twice as much traffic with less frame utilization in the past, so what would be causing this? VC Count: 48 Frame Configuration: Downlink Data: 75% Contention Slots: 6 Broadcast Repeat Count: 2 Chris Wright Network Administrator
Re: [AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization
First question would be what modulation the higher traffic SMs are at, and what their link tests look like. If you have subs at 2X or MIMO-A, that will suck up lots of capacity. Generally you want your high BW users at 6X or 8X. From: Af [mailto:af-boun...@afmug.com] On Behalf Of Chris Wright Sent: Monday, September 26, 2016 2:07 PM To: af@afmug.com Subject: [AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization I have a couple 450 APs showing relatively low traffic (20mbps) but 100% downlink frame utilization on a 20mhz channel. I've seen this AP do twice as much traffic with less frame utilization in the past, so what would be causing this? VC Count: 48 Frame Configuration: Downlink Data: 75% Contention Slots: 6 Broadcast Repeat Count: 2 Chris Wright Network Administrator
Re: [AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization
Look at the AP's power tab on the sessions page. Do you see any SMs at MIMO-A and/or less than 8X/6X modulation? That's the downlink rate to the SMs. 4X is going to eat up some air time. 2X and 1X is obviously even worse. MIMO-A is even more ungood. I know Aaron talked about adding support to penalize low mod SMs so they will have less effect on air time utilization. I hope that's coming in 14.3. Or maybe he said for 15.0. I don't remember. On 9/26/2016 2:07 PM, Chris Wright wrote: I have a couple 450 APs showing relatively low traffic (20mbps) but 100% downlink frame utilization on a 20mhz channel. I�ve seen this AP do twice as much traffic with less frame utilization in the past, so what would be causing this? VC Count: 48 *Frame Configuration:* Downlink Data: 75% Contention Slots: 6 Broadcast Repeat Count: 2 ** Chris Wright Network Administrator
Re: [AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization
That would be wonderful. I need this feature sooner rather than later. I have a sector with 50 subs that reaches 100% utilized most nights because of the two subs that are at 1x. Of course these two subs use the most bandwidth. Unfortunately, they cannot be moved to another AP at this time. On Mon, Sep 26, 2016 at 2:33 PM, George Skorup wrote: > Look at the AP's power tab on the sessions page. Do you see any SMs at > MIMO-A and/or less than 8X/6X modulation? That's the downlink rate to the > SMs. 4X is going to eat up some air time. 2X and 1X is obviously even > worse. MIMO-A is even more ungood. > > I know Aaron talked about adding support to penalize low mod SMs so they > will have less effect on air time utilization. I hope that's coming in > 14.3. Or maybe he said for 15.0. I don't remember. > > On 9/26/2016 2:07 PM, Chris Wright wrote: > > I have a couple 450 APs showing relatively low traffic (20mbps) but 100% > downlink frame utilization on a 20mhz channel. I�ve seen this AP do twice > as much traffic with less frame utilization in the past, so what would be > causing this? > > � > > VC Count: 48 > > � > > *Frame Configuration:* > > Downlink Data: 75% > > Contention Slots: 6 > > Broadcast Repeat Count: 2 > > *�* > > Chris Wright > > Network Administrator > > � > > >
Re: [AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization
Aha, thanks! Bummer that a couple bad eggs spoil the entire AP. We'll have to go out and improve these relics from when we had lower standards. Chris Wright Network Administrator From: Af [mailto:af-boun...@afmug.com] On Behalf Of George Skorup Sent: Monday, September 26, 2016 12:34 PM To: af@afmug.com Subject: Re: [AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization Look at the AP's power tab on the sessions page. Do you see any SMs at MIMO-A and/or less than 8X/6X modulation? That's the downlink rate to the SMs. 4X is going to eat up some air time. 2X and 1X is obviously even worse. MIMO-A is even more ungood. I know Aaron talked about adding support to penalize low mod SMs so they will have less effect on air time utilization. I hope that's coming in 14.3. Or maybe he said for 15.0. I don't remember. On 9/26/2016 2:07 PM, Chris Wright wrote: I have a couple 450 APs showing relatively low traffic (20mbps) but 100% downlink frame utilization on a 20mhz channel. I�ve seen this AP do twice as much traffic with less frame utilization in the past, so what would be causing this? � VC Count: 48 � Frame Configuration: Downlink Data: 75% Contention Slots: 6 Broadcast Repeat Count: 2 � Chris Wright Network Administrator �
Re: [AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization
FWIW, based on comments from the list, we recently tried a couple of the 450D SMs on some underperforming links. Actually we were going straight from 430 SMs in compatibility mode to the 450D, so I dont know what we would have gotten by popping a regular 450 SM into the dish. But on this small sample, the signal and stability improved noticeably. Hard to say exactly why. But it might be worth a try. If youre down at 1X or 2X though, finding a different tower might be necessary. From: Af [mailto:af-boun...@afmug.com] On Behalf Of Chris Wright Sent: Monday, September 26, 2016 3:24 PM To: af@afmug.com Subject: Re: [AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization Aha, thanks! Bummer that a couple bad eggs spoil the entire AP. Well have to go out and improve these relics from when we had lower standards. Chris Wright Network Administrator From: Af [mailto:af-boun...@afmug.com] On Behalf Of George Skorup Sent: Monday, September 26, 2016 12:34 PM To: af@afmug.com <mailto:af@afmug.com> Subject: Re: [AFMUG] 450 on 14.2 (Build 30) Low Traffic, High Frame Utilization Look at the AP's power tab on the sessions page. Do you see any SMs at MIMO-A and/or less than 8X/6X modulation? That's the downlink rate to the SMs. 4X is going to eat up some air time. 2X and 1X is obviously even worse. MIMO-A is even more ungood. I know Aaron talked about adding support to penalize low mod SMs so they will have less effect on air time utilization. I hope that's coming in 14.3. Or maybe he said for 15.0. I don't remember. On 9/26/2016 2:07 PM, Chris Wright wrote: I have a couple 450 APs showing relatively low traffic (20mbps) but 100% downlink frame utilization on a 20mhz channel. I�ve seen this AP do twice as much traffic with less frame utilization in the past, so what would be causing this? � VC Count: 48 � Frame Configuration: Downlink Data: 75% Contention Slots: 6 Broadcast Repeat Count: 2 � Chris Wright Network Administrator �
