Switching of time division multiplex lines through telephone central offices

摘要: The communications channels or time slots of division multiplex lines are enabled to be switched through a conventional common control telephone switching office by providing each line with plurality digital trunks, one for slot in frame, extracting call signaling information from the and establishing cross-office connections trunk. To avoid excessive crosstalk, contents slot, registered its respective trunk, is outpulsed crossoffice at pulse repetition rate less than characteristic but interval substantially occupied complete frame slots.