PERFECCIONAMIENTOS EN LOS APARATOS PARA CONCENTRAR UNA PLURALIDAD DE LINEAS DE TELECOMUNICACION Y MEJORAS EN LAS REDES DE TELECOMUNICACION

摘要

A concentrator for telecommunication lines uses a crosspoint matrix (100) incorporating semiconductor switches. A number of subscriber lines (1-14) are inputs to the matrix, and a smaller number of trunk lines are outputs. A subscriber loop detector is connected as a further input line and is connected successively to the input lines to scan them for a signalling loop. The detector and input lines are connected over a column of the matrix corresponding to a usable output line, and this column is varied. When all trunk lines are in use scanning ceases.