The system LED of the AP-205H does not have a state to show the type of POE source that is used to power the device. If the LED is amber, it's because of the reasons mentioned earlier.
It may be possible to identify the type of POE source by enabling the PSE function of the 205H and observiung the PSE LED. If the POE source is 802.3af, enabling the PSE function will have no effect and the LED will remain off. If the source is 802.3at, the LED will turn green.
Note that not every "802.3at" POE source may be identified as such. Some pre-standard sources may be identified as 802.3af.