Not talking about sustained speed keys (finally gone in the 450b) but the point at which you haven't maxed out the RF capability but the CPU horsepower becomes the limiting factor and you can't get any more pps through it. I think the SMs also have this issue, but less likely to be a problem unless using them in PTP mode or having a small number of very high bandwidth customers.
Or maybe you are saying the APs never had the CPU limitation like the SMs, but I'm pretty sure they did. Each generation 450, 450i, 450m having a more powerful CPU. Although not as powerful as we might think from the price, I guess maybe the result of using a processor core in an FPGA, it seems like lowly WiFi chips have more CPU power. I think most of us were surprised to find the limitation could be CPU not RF. From: AF <af-boun...@af.afmug.com> On Behalf Of Adam Moffett Sent: Friday, October 23, 2020 6:42 AM To: af@af.afmug.com Subject: Re: [AFMUG] 450 and 450i AP CPU limit on throughput? I thought the limitation was on what a single SM did. .....maybe mistaken. On 10/23/2020 12:14 AM, Ken Hohhof wrote: Does anyone know off the top of your head what the current CPU limited max throughput is for 450 vs 450i APs? Not based on RF characteristics but packet processing in the CPU. I keep thinking at one time 450 APs were only capable of maybe 20 Mbps but that can't be right because I have some doing over 40. I think Cambium said that firmware tweaking kept raising that number. I'm asking because I have one lone site with a 450 and an omni, and maybe a dozen subs scattered through the entire 360 degrees. So while I am going to need more throughput, it just doesn't justify 4 sectors, and the cables are in conduit and I think we only ran 4 cables and we have 2 backhauls. And it occurs to me what I need isn't sectors, it's to increase the channel width to 30 MHz (450) or 40 MHz (450i). But will a 30 MHz channel really help if the 450 AP is pps limited by the CPU? I'm OK with replacing the 450 with a 450i if necessary. Most sites we have at least 4 sectors, so mostly 20 MHz channels. But an omni with a 40 MHz channel would use the same amount of spectrum as 4 sectors and 20 MHz channels.
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