The Universal Accessories indicates the type of power source
The Universal Accessories identifies the existence and type of Power Sourcing Equipment (either Endspan or Midspan) in your network. A PoE system comprises a PSE (Power Sourcing Equipment)and a PD (Powered Device). The PSE may either be an End-span (i.e. a layer 2 Ethernet Switch with integrated PoE) or a mid-span, while the PD is a PoE-enabled terminal, such as IP phone, Wireless LAN access point and Network Security Camera.