You are planning the installation of several wireless access points in a large warehouse. The access points are typically located on the ceiling far away from power sources. Which technology could be used to power the device?
Answer Description
Power over Ethernet (PoE) allows a device to use an ethernet cable as a power source and it's data/network connection. Using PoE the wireless access points will not need separate power and data connections.
Wikipedia
Power over Ethernet or PoE describes any of several standardized or ad-hoc systems which pass electric power along with data on twisted pair Ethernet cabling. This allows a single cable to provide both data connection and electric power to devices such as wireless access points, IP cameras, and VoIP phones.
There are several common techniques for transmitting power over Ethernet cabling. Two of them have been standardized by IEEE 802.3 since 2003. These standards are known …
Power over Ethernet - Wikipedia, the free encyclopedia