Weak Signal-to-Noise Ratio Probe Response set to 20 dBm, but APs still respond to weak clients

  • 1
  • Question
  • Updated 4 years ago
  • Answered
I have this set in the radio profile,



So why is the AP still responding to clients with weak SNR?  Below is what I see in client monitor,

07/30/2014 10:36:18 AM  606720F6A908  E01C416BFD54  ap-name  DETAIL  (2452)Rx <broadcast> probe req (rssi 13dB)
07/30/2014 10:36:18 AM  606720F6A908  E01C416BFD54  ap-name  BASIC   (2453)Tx probe resp (pwr 10dBm)
07/30/2014 10:36:18 AM  606720F6A908  E01C416BFD55  ap-name  DETAIL  (2454)Rx <broadcast> probe req (rssi 13dB)
07/30/2014 10:36:18 AM  606720F6A908  E01C416BFD55  ap-name  BASIC   (2455)Tx probe resp (pwr 10dBm)
Photo of wombat

wombat

  • 62 Posts
  • 3 Reply Likes

Posted 4 years ago

  • 1
Photo of Eastman Rivai

Eastman Rivai, Official Rep

  • 146 Posts
  • 17 Reply Likes
The association will still be accepted if the AP is not overloaded or the client cannot find any other APs with good signal within safety net period.

The following information from the help file should explain more.

''

Selectively respond to probe requests if the SNR (Signal-to-Noise Ratio) is stronger than the weak SNR threshold: Select to suppress probe responses if APs detect that the SNR (signal-to-noise ratio) for a client is weak, as determined by its measurement against the SNR threshold.

Weak SNR Threshold: Either keep the SNR threshold set at 15 dB, its default setting, or raise or lower it from 1 to 100 dB. An SNR of 10 dB or lower is generally considered poor and an SNR of 25 dB or greater is generally considered good.

Enable an AP, when it is in an overloaded state or a client's SNR is weak, to respond to association requests after the safety net period elapses: Although the purpose of the settings in the Minimizing Management Traffic section is to increase airtime for user traffic by reducing management traffic, the overarching goal for APs is to provide wireless network connectivity. Select the check box to enable APs that are overloaded or receive association requests from clients with a weak SNR to deflect clients for only a limited period of time—with the intention that they will then associate with a less busy AP or with a closer one—but eventually respond if clients cannot obtain network connections elsewhere. That period during which APs ignore association requests is referred to as a "safety net period". To disable the safety net option, clear the check box.

Safety Net Period: Either keep the safety net period at its default setting of 60 seconds or shorten or lengthen it from 5 to 300 seconds. A longer safety net period might result in longer delays during the initial WLAN connection but greater chances of associating with an AP that can provide superior data rates. On the other hand, a shorter period can accelerate the initial connection but perhaps at the cost of a less optimal data rate.

''


Photo of wombat

wombat

  • 62 Posts
  • 3 Reply Likes
it is a dense deployment though, with at least 4 other APs that can hear the client above that signal threshold.