Lan PoE Switches

Power over Ethernet or PoE technology describes a system to safely pass electrical power, along with data, on Ethernet cabling. Power can come from a power supply within a PoE-enabled networking device such as an Ethernet switch or from a device built for "injecting" power onto the Ethernet cabling, dubbed Midspan.

Uses for PoE include

Powering VoIP phones
Powering networking equipment such as routers and wireless access points
Powering devices such as network webcams