You need to verify which access point you were connecting to and whether that access point was the closest one to you.
There also may be a difference in the antenna that performed the survey and the apple phone causing a discrepancy in signal strengt...
If you have a Cisco WLC you can at least do rogue access point detection with Cisco Cleanair capable AP's. You would have the WLC notify you and then you would have to go to the AP that detected its location and manually find who was operating the h...
If they have a lot of interference from neighbors you definately need to do a survey to appropriately ensure coverage and speed. For Example: in a warehouse environment with 30 ft ceilings you get approximately 20k sq feet per AP, but that can vary ...
I should have looked at your attachment first sorry about that. Speaking of upgrades, have you considered upgrading the 5508 IOS? 7.2.111.3 has been out since September and may have a fix for the error you are running into.Also someone ran into the...