The two networking can work at same time. and you need to connect the usb power. 100Mbps STP UTP RJ45 8P8C Plug To Dual RJ45 HUB Splitter Network Ethernet Switcher Adapter This compact splitter is the perfect tool for expanding your home or office network, allowing more than one computer to be connected to the same ports! Easily convert your RJ45 outlet to two RJ45 sockets with this network splitter This compact design allows you to comfortably increase the number of RJ45 network connections on an RJ45 outlet. Allow two computers to share high speed DSL, cable modem and Ethernet ports. Support 100Mbps networking speed. Ethernet network switch,Without router and modem function
