Telephone device of interconnection with the system of identification of troubleshooting of the electromechanical telephone centrals type cross bars (Machine-translation by Google Translate, not legally binding)

摘要

TELEPHONE DEVICE FOR INTERCONNECTION WITH A TROUBLE IDENTIFICATION SYSTEM. IT CONSISTS OF AN ELECTRONIC CIRCUIT FORMED BY: AN IDENTIFICATION SIGNAL PASS TRANSISTOR (T2); A RESISTANCE (R5) THAT POLARIZES ITS BASE; A TRANSISTOR (T1) AND ZENER DIODE (D2) THAT WHEN THE POSITIVE VOLTAGE IN THE COMPUTER WIRE IS LESS THAN THE ZENER VOLTAGE (D2), THE TRANSISTOR (T1) IS LOCKED AND WHEN IT IS SUPERIOR, IT DRIVES AND BLOCKS THE TRANSISTOR (T2); A RESISTANCE (R4) THAT POLARIZES THE TRANSISTOR (T1) AND LIMITS THE CURRENT BY THE DIODE (D2); A ZENER DIODE (D1) AND A LIMITING RESISTANCE (R3); DIODES (D3, D4) THAT PREVENT REVERSE CURRENTS TOWARDS THE THREAD (HE); AND ZENER DIODES (D5 AND D6). (Machine-translation by Google Translate, not legally binding)