SECRETARY-EXECUTIVE TELEPHONE SET WITH SECRECY FEATURE

摘要

A business-class telephone set, with the unwanted emission path broken, consisting of a subscriber unit connected by a fibre optic cable with an exchange unit that co-operates with a classic telephone line, characterized in that the subscriber unit (UA) is connected with two telephone devices: the secretary telephone (ATS) and the manager telephone (ATD), whereas the subscriber unit (UA) is fitted with an auxiliary unit (UP) consisting of three switching units (UPA, UPB, UPC), and the subscriber unit (UA) is connected on one side with the receiving track (TO), the transmitting track (TN) and with the carrier wave keyed generator (KG), and on the other side, it is connected with the secretary telephone (ATS) and the manager telephone (ATD), whereas one contact (R ) in the external operation mode switch (M) in the secretary telephone (ATS) is connected with the control unit of the first switching unit (UPA), whereas in the manager telephone (TDA), this contact is connected with the control circuit of the second switching unit (UPB), whereas the outputs of the UPA and UPB units are connected with the control circuit of the third switching unit (UPC), and keyed generators (KG) are installed in the (UA) unit and (UC) unit, whereas the KG unit is a harmonic generator.IMAGE