System for the redundant connection of a data-producing device to a backbone network, comprising: a primary network which enables an exchange of data packets with the backbone network, a secondary network which by means of PLC - Power Line Communication - or by means of BPL - Broadband Power Line - is constructed on an energy supply network, at least one data-producing device which is constructed for producing data packets which are intended to be transmitted for transfer to the backbone network, a plurality of uplink nodes (2, 2', 2") which each have a first interface (3, 3', 3") for communication with the primary network and a second interface (4, 4', 4") for communication with the secondary network, wherein the uplink nodes (2, 2', 2") are constructed for the secondary network to switch into a repeater mode or a headend mode, wherein switching into the repeater mode or into the headend mode is negotiated between the uplink nodes (2, 2', 2") and wherein at least one of the uplink nodes (2, 2', 2") is operated in the headend mode, wherein each uplink node (2, 2', 2") is additionally constructed to transmit a data packet which is intended to be transmitted via the first interface (3, 3', 3") to the primary network or - when a value falls below a limit value as a result of the quality of the connection to the primary network - via the second interface (4, 4', 4") to the secondary network, and wherein an uplink node (2, 2', 2") forwards in the headend mode a data packet which is received via the second interface (4, 4', 4") thereof from another uplink node (2, 2', 2") via the first interface (3, 3', 3") to the primary network. a primary network which enables an exchange of data packets with the backbone network, a secondary network which by means of PLC - Power Line Communication - or by means of BPL - Broadband Power Line - is constructed on an energy supply network, at least one data-producing device which is constructed for producing data packets which are intended to be transmitted for transfer to the backbone network, a plurality of uplink nodes (2, 2', 2") which each have a first interface (3, 3', 3") for communication with the primary network and a second interface (4, 4', 4") for communication with the secondary network, wherein the uplink nodes (2, 2', 2") are constructed for the secondary network to switch into a repeater mode or a headend mode, wherein switching into the repeater mode or into the headend mode is negotiated between the uplink nodes (2, 2', 2") and wherein at least one of the uplink nodes (2, 2', 2") is operated in the headend mode, wherein each uplink node (2, 2', 2") is additionally constructed to transmit a data packet which is intended to be transmitted via the first interface (3, 3', 3") to the primary network or - when a value falls below a limit value as a result of the quality of the connection to the primary network - via the second interface (4, 4', 4") to the secondary network, and wherein an uplink node (2, 2', 2") forwards in the headend mode a data packet which is received via the second interface (4, 4', 4") thereof from another uplink node (2, 2', 2") via the first interface (3, 3', 3") to the primary network.