Ethernet splitters let you run two network connections over a single Ethernet cable. They don't create extra bandwidth. This is particularly useful in homes or offices where there are more devices than available Ethernet ports on the router. The problem is that when multiple devices use a passive Ethernet splitter, each one only gets a portion of the total available bandwidth, and you may not know how much. The answer is contingent on several factors including the quality of the splitter, how many devices are being connected, and the specifications of your internet service. Splitters turn one Ethernet connection into two by splitting the signal, but they halve the current signal instead of doubling it.