TALKIE TRANSMITTING CIRCUIT

摘要

PURPOSE:To miniaturize a talkie transmission circuit by constituting the titled circuit of a subscriber line corresponding section used in common for an individual talkie tone transmission path and a simultaneous talkie tone transmission path, and an individual talkie tone source and a simultaneous talkie tone source connected by switching thereto. CONSTITUTION:A contact r1 is closed by a command from a program at the time of transmission of individual talkie; an individual talkie tone is transmitted to a calling subscriber in such a course as individual tone source TK1 contact r5 coil T1 contact r6 contact CBnl for cut-off CO subscriber line RL subscriber terminal RT contact CAnl for CO fuse F2 power supply P4 to inform the congesting state of a common controller CC. When a contact r2 is closed by the start of the maintenance personnel at the transmission of simultaneous talkie tone, contacts r5 r6 are reconnected to the opposite side and system-down is informed to a subscriber terminal during talking in such a course as simultaneous talkie tone source TK2 r5 T1 r6 Zener diode D1n relay contact rAn contact LAnl for subscriber line test LT RL RT contact LBnl for LT relay contact rB4n. The coil T and the fuse F2 are used in common and the circuit is miniaturized.