A dual-band 802.11ac AP must be powered by 802.3at PoE. As a class 4 device, what minimum power level should be received at the AP assuming a proper cable length?
A. 25.5 W
Explanation: For a dual-band 802.11ac access point (AP) powered by 802.3at PoE (also known as PoE+), the AP is classified as a Class 4 device. This means it requires a minimum of 25.5 W of power at the device itself. While 802.3at can deliver up to 30 W from the power source, power loss over the Ethernet cable means that only 25.5 W is guaranteed to reach the device under proper conditions.
Here’s why the other options are incorrect:
B. 30 W: This is the power output at the PoE source, but it does not account for power loss over the cable.
C. 12.95 W and D. 15.4 W: These are power levels associated with 802.3af (PoE) devices, which is insufficient for an 802.11ac AP requiring 802.3at (PoE+).
Therefore, 25.5 W (A) is the minimum power level required at the AP.
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1 week, 6 days agosebastiencrettaz
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