Which value is the default RxSOP threshold on a WLC ?

The default RxSOP threshold on a Cisco WLC is set to 'auto', meaning the controller automatically determines the appropriate minimum signal threshold at which an AP will begin decoding a received packet, without requiring manual configuration.

Medium is not the default RxSOP value; it is a manually selectable option used to raise the threshold and reduce cell size in high-density deployments.

Low is a manually selectable RxSOP option that lowers the threshold to increase cell coverage, but it is not the factory default setting.

High is a manually selectable RxSOP option used to significantly shrink AP cell size in very dense environments, but it is not the default.