An electrical transmission system is indicated, in which a broadband distribution network (2) has a center (1) and a number of terminals (26) connected thereto, which can receive TV and Audio signals emitted by the center (1), and individual subscriber signals, and which can send upstream signals to the center (1). The broadband distribution network (2) has a number of amplifiers (10) that are close to the subscribers, to which a group of terminals (26) is connected, each of which is connected to a back-channel facility (4). The back-channel facility (4) is connected to a two-wire line (21) which is indirectly connected to the center (1). The back-channel facility (4) evaluates the upstream signals sent by a group of terminals (26).