A network, in particular in a motor vehicle, wherein the network includes a central subscriber and at least one first subscriber, wherein the central subscriber and the at least one first subscriber are connected via at least one first cable, wherein the central subscriber has at least one signal coupling unit and at least one energy coupling unit, wherein by the signal coupling unit an AC voltage can be impressed on at least one first line of the first cable or can be tapped therefrom. Also disclosed is a method for operating a network.