Telephone Device for Interconnection with the System Identification of faults Cross Bar type Electromechanical telephone exchanges

摘要

Telephone Device Interconnection with a system of identification of faults.An electronic circuit is composed of a transistor (T2) of Step Signal identification; Resistance (R5) which has its base; a transistor (T1) and Zener Diode (D2) that when the positive tension in the thread of Computation is lower than the Zener Voltage, The Transistor ((D2) this T1) Blocked and when is higher.Leads and blocks The Transistor (T2), a resistor (R4) which polarizes The Transistor (T1) and limits the current through the Diode (D2), a Zener Diode (D1) and a limiting resistor (R3); Diodes (D3, D4) that prevent Reverse flows to the thread (i); and Zener Diode (D5 and D6).