Monobus interface circuit

Details Monobus interface circuit Monobus interface circuit

1975-05-23

1976-11-09

Claffy, Kathleen H.

179 1CN, H04M 356

Patent

active

039912795

ABSTRACT:
In order to reduce the signal loss in a telephone line switching and conferencing system there is interposed between each line and the switching matrix a monobus port circuit arranged to convert a transmitted telephone signal into an equivalent current source. The currents from several monobus circuits are added in a bus resistor before distribution back to the individual monobus circuit as a voltage where the original signal is subtracted from the bus signal. The resultant signal is transmitted to the telephone receiver. When the switching matrix crosspoint resistance is negligible, the component of the bus voltage measured at the current source output which results from current generated from each line is equal and opposite in magnitude to the voltage generated in the line. In any given line these voltages cancel each other, thereby eliminating the feedback signal.

REFERENCES:
patent: 3534175 (1970-10-01), Schultz
patent: 3668289 (1972-06-01), Fenton
patent: 3818139 (1974-06-01), Snyder
patent: 3824344 (1974-07-01), James et al.
patent: 3828146 (1974-08-01), Lewis
patent: 3891801 (1975-06-01), Wang
patent: 3909559 (1975-09-01), Taylor

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