'PoE/Full Power' vs 'PoE/Medium Power (15.4 W)' in PoE Status

[Andrey128]

two access points AIR-CAP2702I are powered from one access switch with the same settings on ports; one access point shows 'PoE/Full Power', another shows 'PoE/Medium Power (15.4 W)' in PoE status on a wireless controller.

Is 'PoE/Medium Power (15.4 W)' means that some transmitters may be disabled due to insufficient power?

[mohanak]

Refer the link : http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-5/configuration-guide/b_cg75/b_cg75_chapter_01111001.pdf

15.4 W—Only a single transmitter is enabled. Legacy data rates and M0 to M7 rates are minimally affected. M8 to M15 rates are disabled because they require both transmitters. Throughput is better than that received with legacy access points but less than the 20 and 16.8 W power modes.

[Jazzlee008]

I tested the CAP2702i with connection of 2960S-FPS-L(740W).

The normal status is the switch port power showed 16.8W with 2702i, I tested the client which showed 866.7Mpbs connection speed, then I set the switch port power to 15.4W, after AP reboot, I tested the same client which showed 866.7Mbps connection speed also. Download and upload speed is also no any changes.

I'm very confused, since if M8 to M15 rates were disabled, the connection speed of client should be slow down, but the fact is no any change.

I saw the data sheet of AP 2700 mentioned the MIMO will change from 3x4:3 to 3x3:3 when power go down to 15.4W. From my understanding, it will impact some additional function, e.g. Client link 3.0, since the MIMO go to 3x3:3. Am I right?

Waiting expert to explain it.