CIRCUIT PROVISION FOR TELECOMMUNICATION SWITCHING FACILITIES, ESPECIALLY TELEPHONE SWITCHING FACILITIES, WITH POWERED CONNECTION FACILITIES WITH OPERATING VOLTAGE AND WITH ADDITIONAL VOLTAGE.

摘要

FOR SAFETY REASONS, INDIVIDUAL AND POWER SUPPLIED SWITCHING DEVICES ARE DUPLICATED, AND POWERED BY ONE OF TWO ADDITIONAL SOURCES OF VOLTAGE INTENDED FOR IT. THE SWITCHING OF ONE OF THE TWO SOURCES OF ADDITIONAL VOLTAGE TO THE OTHER, WAS DONE IN THE OLD VERSION, CENTRALLY, IN COUNTERPOSITION TO THE NEW VERSION, WHICH IS NOT. ON THE OTHER SIDE, THE SWITCHING DEVICES CAPABLE OF BEING EMPLOYED AND WHICH ARE UNIVERSAL, ARE EQUIPPED WITH A SURVEILLANCE DEVICE WITH WHICH AID THE FALLING OF THE THREE-SECOND ADDITIONAL TENSION IS PERFECTLY CONTROLLED. BOTH VERSIONS ARE DIFFERENT IN THIS, AS WELL AS THE START-UP AND USE OF EACH ONE OF THEM.