CyberCertPrepNetwork FundamentalsNetwork DevicesEASYFree question
What does PoE (Power over Ethernet) deliver, and which IEEE standard provides up to 90W per port for high-power devices such as pan-tilt-zoom cameras and video collaboration endpoints?
- A.IEEE 802.3at (PoE+), which delivers up to 60W per port
- B.IEEE 802.3af (PoE), which delivers up to 30W per port
- C.IEEE 802.3bt (PoE++), which delivers up to 90W per port over all four pairs
- D.IEEE 802.3az (Energy Efficient Ethernet), which provides up to 90W when the link is idle
Why C is correct
IEEE 802.3bt (PoE++, also called 4PPoE) delivers up to 90W (Type 4) per port by using all four wire pairs. 802.3af (PoE) provides up to 15.4W; 802.3at (PoE+) provides up to 30W. 802.3az is Energy Efficient Ethernet (EEE) and has nothing to do with power delivery. High-power PTZ cameras and video bars typically require 802.3bt.
Know someone studying for Network Fundamentals? Send them this one.