topic Re: A Query regarding power Tx , Transmission Power in Aerohive Migrated Content

A Query regarding power Tx , Transmission Power

cforrest — Wed, 11 Sep 2019 21:50:50 GMT

As some of our AP's are left to to dynamically adjust power from ACSP and reflect power 8, I have changed a few to a lower tx Power as they did not lower , however I have noted something else , within the AP interface configuration. When setting the MAx power should you also check > Enable client transmission power control (802.11h) and what is the outcome of this as you can choose Auto or Manual

Re: A Query regarding power Tx , Transmission Power

cforrest — Wed, 11 Sep 2019 21:53:31 GMT

If it is set from a policy template will it simply inherit it ? or if you change for example the Tx power on a particular AP, this will override the policy and hence is this why it does not show

Re: A Query regarding power Tx , Transmission Power

samantha_lynn — Fri, 13 Sep 2019 19:11:49 GMT

The option Enable Client Transmission Power Control (802.11h) lets the AP control the transmit power of connected clients by sending a management frame with a power constraint element. This will tell the client device the max power level it can use to transmit signal. This is used to help mitigate co-channel interference. If you select Auto, this will automatically adjust the clients transmission power based on background scans. If you select Manual, you can manually choose the max transmission power of clients connecting to your network.

You can read more about this feature here, in the Configure an AP Wireless Interface section: http://docs.aerohive.com/330000/docs/help/english/ng/Content/gui/devices/configuring-interface-settings.htm?Highlight=Enable%20client%20transmission%20power%20control

Is that what you were asking? Please let me know if I can clarify anything.

Re: A Query regarding power Tx , Transmission Power

cforrest — Fri, 13 Sep 2019 19:31:02 GMT

I have just sent you some screenshots, I am a little confused

Re: A Query regarding power Tx , Transmission Power

samantha_lynn — Fri, 13 Sep 2019 19:43:33 GMT

Thank you for those screen shots. The device specific settings will override the template you have set, so if you have a template in place and then modify the device on the Monitor tab to have different settings than the template, the device settings will take effect and the template settings will not.

Re: A Query regarding power Tx , Transmission Power

cforrest — Fri, 13 Sep 2019 19:53:25 GMT

Ah so even on settings you haven't changed at this level, will be affected. Would you recommend for all devices on Auto, the 802.11h is enabled , what is the preference typically

Re: A Query regarding power Tx , Transmission Power

cforrest — Fri, 13 Sep 2019 20:05:47 GMT

When the AP setting is manual for power , do you enable 802.11h to the power of the station if you cant choose auto ?

Re: A Query regarding power Tx , Transmission Power

samantha_lynn — Fri, 13 Sep 2019 21:15:42 GMT

For the AP power, Auto is good if your APs are getting background scans through. The AP will do a background scan, and then it can adjust your power according to the network environment at the time, which is ideal. Unfortunately background scans can be missed for various reasons, which means the AP wouldn't be adjusting the power to match the environment, and you might end up with an inappropriate power setting.

You can check if you're getting background scans through by running the command "show int wifi0" and "show int wifi1". You're looking for BGSCAN in the output and you want to compare how many scans are going through vs. how many were missed. Missing a few is fine, but missing the majority means the Auto power and channel settings are likely not a good fit for you.

For the client power (802.11h), unless you have clients that are broadcasting too much or too strongly, I'd leave that setting off and let the client devices manage their own power levels. If you do have to set the client transmission power level, it doesn't necessarily need to match the APs power level. Mostly you'll want to be sure you aren't forcing the clients to a power level that is too low, which would mean their signal may not reach the AP very well. With that in mind, I'd recommend starting high and lowering as needed, if you are going to try to control client power levels too.