OK, I've been watching a site for a couple days. This particular site is about a 160 foot grain elevator in a very small town, like 20 houses and businesses. Most of the customers are well outside of town.
One of the APs watchdog reset itself a few days ago, so I found some SMs registered on secondary. I dropped sessions to get things back to normal. Uplink and downlink SNRs and rates all looked good. So I was scratching my head because a few days before that is when I was seeing the bad downlinks to near SMs.
Fast forward to today, I looked things over this morning and all looked fine. Now this afternoon I'm seeing some short range SMs with 15-20dB downlink SNR. One SM in particular is about 500 feet from the tower. The other day his SNR was solid at >32dB. Today it's sitting at <20dB and downlink rate is 4X as expected.
Watching it continuously, I see that it jumps back up to 35/35dB once in a while. The customer is definitely moving traffic, so the data can be trusted.
So now I'm wondering if I'm seeing the drifting timing issue that Mark @ Amplex has talked about quite a few times. I bet that's what's going on here!
Here's that SMs stats..
