問題文
An office is choosing switches for a refresh and needs to know how much power each access point can draw. Which comparison of the two older Power over Ethernet types is correct?
選択肢
- A powered device under 802.3af receives up to 15.4 W while the switch port itself is limited to 12.95 W in every case.
- A powered device under 802.3af receives up to 12.95 W while a powered device under 802.3at receives up to 25.5 W from the same switch port here.
- A powered device under 802.3af receives up to 25.5 W while a powered device under 802.3at receives up to 12.95 W from the same port.
- The types 802.3af and 802.3at both deliver 30 W with the difference lying in the category of cable in use.