Telephone multiline signaling using common signal pair

Details Telephone multiline signaling using common signal pair Telephone multiline signaling using common signal pair

1978-06-23

1979-05-08

Cooper, William C.

179 1MN, 179 84VF, H04M 322

Patent

active

041538188

ABSTRACT:
A telephone multiline signaling system using a common signal pair of lines for transmitting coded electrical signals for selectively connecting one or more of a plurality of telephone lines to a telephone line or channel located at an operator's console. The 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 one or more of a plurality of telephone lines to the console so as to enable the operator to listen and/or talk over a plurality of lines simultaneously. The system includes an on-site console having a plurality of mechanically operated thumb wheel switches provided thereon on which the desired lines to be connected thereto can be dialed in. Electrical coded signals are fed to a plurality 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.

REFERENCES:
patent: 4103113 (1978-07-01), Sato et al.

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