Smart subscriber seconder (Machine-translation by Google Translate, not legally binding)

摘要

It is the invention in a device that situated between subscriber loop and its installation, allows to supervise from the telephone central the operation of the subscriber loop with independence of the installation and/or terminals of the subscriber.in normal situation, relay relief contacts bistable 1 apply the terminals of central 2-2 to the installation of subscriber 3-3 through the rectifier bridges 4 and 5. In parallel with the terminals of central 2-2 the bridge rectifier 6, the coil 7 and the current limiter 8 feed the dc/cc converter 9 whose output, in addition to charging the condenser 10 applies to the action control circuit 11 where the presence or not of the battery voltage is monitored. (Machine-translation by Google Translate, not legally binding)