An engineer installed a 3702 AP and is getting power from the switch. What is the reason for getting 3x3 MIMO instead of 4x4?

The correct answer is B. 802.3af. The Cisco Aironet 3702 AP supports 4x4:3 MIMO (4 transmit, 4 receive, 3 spatial streams) but requires 802.3at (PoE+, up to 30W) for full operation. When powered only by 802.3af (standard PoE, 15.4W), the AP does not receive enough wattage to power all four radio chains…

Wireless Infrastructure

Question

Options

A802.1p
B802.3af
C802.11e
D802.3at

How the community answered

(52 responses)

A
6% (3)
B
81% (42)
C
10% (5)
D
4% (2)

Explanation

The Cisco Aironet 3702 AP supports 4x4:3 MIMO (4 transmit, 4 receive, 3 spatial streams) but requires 802.3at (PoE+, up to 30W) for full operation. When powered only by 802.3af (standard PoE, 15.4W), the AP does not receive enough wattage to power all four radio chains simultaneously, causing it to fall back to 3x3 MIMO. 802.1p (option A) and 802.11e (option C) are QoS standards unrelated to power. 802.3at (option D) is the standard that would provide sufficient power for 4x4 MIMO-meaning the switch lacks it, making 802.3af the root cause.

Topics

#802.3af#PoE limitations#MIMO configuration#AP power modes

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