An engineer is upgrading the legacy access points to 802.11ac Wave 2 capable access points. The existing gigabit uplinked switches provide 802.3at. Which switch limitation is a concern?

The correct answer is C. output power. 802.3at (PoE+) delivers a maximum of 30W at the switch port and ~25.5W at the powered device (PD). 802.11ac Wave 2 APs - especially those with MU-MIMO, multiple spatial streams, and dual radios - often require more power than 802.3at can supply and instead need 802.3bt (PoE++)…

Wireless Infrastructure

Question

Options

Acollision domains
Bhigh availability
Coutput power
Dinterface throughput

How the community answered

(35 responses)

A
6% (2)
B
3% (1)
C
80% (28)
D
11% (4)

Explanation

802.3at (PoE+) delivers a maximum of 30W at the switch port and ~25.5W at the powered device (PD). 802.11ac Wave 2 APs - especially those with MU-MIMO, multiple spatial streams, and dual radios - often require more power than 802.3at can supply and instead need 802.3bt (PoE++), which delivers up to 60W or 100W. When upgrading legacy APs to Wave 2 hardware, the PoE output power of existing 802.3at switches is a significant limitation, potentially requiring switch upgrades or midspan injectors. Collision domains, high availability, and interface throughput (1 Gbps is sufficient for most Wave 2 deployments) are less immediately constrained by 802.3at.

Topics

#802.11ac Wave 2#PoE#802.3at#power budget

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