Telecommunications system equipped with a supply switch for a telecommunication line and a supply switch for a telecommunication line suitable for application in the telecommunication system

摘要

Supply switch for a telecommunication line, in which a circuit is included comprising a FET between each of the wires of that line and each of a couple of supply lines. In order to keep dissipation in the circuits as low as possible the FET's are equipped with small Vds. According to the invention the Vds of the FET's are dynamically adapted to the possible higher amplitude of the common-mode interference signals on the line, because each circuit is equipped with a top sensor that operates if the amplitude of the interference signal exceeds a specific value and makes the Vds of the FET concerned increase.IMAGE