Ethernet RJ45 8P8C Splitter, 1-Male to 2-Female, Beige Color   (ref the picture for correct use the splitter)

RJ45 Splitter T Adapter 8P8C 1-Male/2-Female

Connects two RJ45 patch cords to a single RJ45 ports. It supports any RJ45 telco applications such as ISDN. (Connectors: RJ45 Male to Two Female; Color: Beige)