Telephone multiline signaling using common signal pair
Abstract
An operator can rapidly and automatically produce coded electrical signals by manipulating mechanical thumb wheel switches so as to instruct a service center to connect any number of telephone lines to the console thus enabling the operator to listen and/or talk over several lines simultaneously. The system includes an on-site console having several mechanically operated thumb wheel switches to which the desired lines to be connected can be dialed in. Electrical coded signals are fed to a number of banks of line AND gates representing units, tens and hundreds, a group of channel gates, and a command gate. These signals are gated out in a controlled manner to an encoder which generates tones that are transmitted over a single line to a communication service center.
- Publication:
-
National Aeronautics and Space Administration Report
- Pub Date:
- May 1979
- Bibcode:
- 1979nasa.reptQ....G
- Keywords:
-
- Consoles;
- Electric Pulses;
- Signal Transmission;
- Telephones;
- Transmission Lines;
- Gates (Circuits);
- Logic Circuits;
- Monitors;
- Patents;
- Signal Reception;
- Verbal Communication;
- Communications and Radar