This model is a 48-ports 10/100/1000Mbps Desktop PoE Switch and 2 1.25G SFP optical ports, it provides the seamless network connection. These PoE ports can automatically detect and supply power with those IEEE 802.3at compliant Powered Devices (PDs). In this situation, the electrical power is transmitted along with data in one single cable allowing you to expand your network where there are no power lines or outlets, where you wish to fix devices such as APs, IP Cameras or IP Phones, etc. VLAN isolation to meet security monitoring requirements Support extension technology, data transmission and power supply up to 250m.