Arrangement for signaling in a voice communication system with optically fed components

US4326298A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ingrid Fromm · Munich, DE
• Helmut Lagger · Munich, DE

Key dates

• Filing date: Jul 16, 1980
• Grant date: Apr 20, 1982
• Expiry date: Jul 16, 2000

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q11/04
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An arrangement for signaling in a voice communication system having optically fed components employs light wave guides which, in addition to serving for the transmission of the communication signals, also serve for the communication of the signals required for completing and disconnecting connections and for the transmission of energy in the form of light for the energy supply of the subscriber stations. The energy for supplying the subscriber stations is transmitted in the form of unmodulated light. The frequency of the unmodulated light deviates from the fundamental frequency of the light signal transmitted from the switching center to the subscriber station. A diplexer is arranged at the subscriber station for the incoming light and conducts the incoming modulated light to a loudspeaker by way of an optical transfer switch and an optoelectronic transducer and feeds the unmodulated light to an acousto optical modulator. In the switching center, apparatus is provided for periodically interrogating all subscriber stations with short light pulses as to their operating conditions. First and second optical transfer switches are provided in the subscriber substations and are indirectly…