Full-Managed. Connections: 24x RJ45, 4x SFP. Number of PoE Ports: 24, PoE Standard: 802.3af/at PoE 30 Watt, PoE Budget: 195 W. Mounting: 19' Rack, Desktop. Internal power supply. Fanless. Power over Ethernet (PoE). With Power over Ethernet, you can supply compatible devices with power through the network cable. This significantly reduces cabling effort for end devices such as wireless access points, IP phones, and IP cameras, while also providing high flexibility in the placement of these devices. 802.3at PoE. The IEEE 802.3at standard provides a maximum of 25.4 Watts of power on each PoE port with a voltage of up to 50 Volts. The standard assumes that after line losses, 21.90 Watts of usable power remain or may be drawn to avoid exceeding the maximum power output. For PoE, a Cat5e/6 cable with a maximum length of 100 m is recommended.