A device (1200) for concentration of unused subscriber lines in a telecommunications or data network comprising a first distribution matrix (104) connected to a crossover matrix (108) and a second distribution matrix (106) connected to said crossover matrix (108), wherein the crossover matrix (108) is adapted to be connected to a distribution cable (1212, 1214) and crossover switching elements for switching of connections within said crossover matrix (108) and distribution switching elements for switching of connections within said distribution matrices (104, 106) are controlled from a remote location, wherein the first distribution matrix (104) and the second distribution matrix (106) are adapted to be connected to a main cable and/or to a node for providing a plurality of telecommunications or data services (1208, 1210).