An Ethernet switch that provides power over Ethernet (PoE) ports.
PoE Switch vs. Midspan PoE Switch
A midspan PoE switch is a regular PoE switch that is placed between a non-PoE switch and devices that require PoE. There is nothing special about a midspan switch other than its location in the network. See PoE
Midspan and Endspan Switches
What makes a PoE switch midspan is its location in the network.