The invention relates to a network with a number of terminals connected by lines. Data and a supply voltage for power supply of the terminals may be transmitted via said lines. At least one switching control unit and at least one switch device with a switch means are provided therefor. The switch means of the switch device may be activated or deactivated by means of operating the switch control unit. With activated switch means a terminal allocated to the switch device is switched on by being connected to a network voltage. With deactivated switch means a terminal allocated to the switch device is switched off by being disconnected from the network voltage.