Signal multiplexing circuit

Details Signal multiplexing circuit Signal multiplexing circuit

1978-07-20

1979-12-11

Brown, Thomas W.

179 15A, 179 2DP, 179 15AW, H04J 300

Patent

active

041784804

ABSTRACT:
The disclosed signal multiplexing circuit (110) makes use of a single pair of wires (T, R) to interface a data and voice communication circuit such as an electronic key telephone (EKT) station set (100) with a central data and voice communication system such as a communication system (BCS). The signal multiplexing circuit transmits outgoing standard voice signals, outgoing auxiliary signals and outgoing data and, in turn, simultaneously receives incoming standard voice signals, incoming data and incoming auxiliary signals on the single pair of wires. Both time division and frequency separation techniques are concurrently employed to achieve multiple use of the single pair of wires without crosstalk between the plurality of signals. The data signals are transmitted as bipolar bit pairs preceded by a data start pulse pair. The outgoing data bipolar bit pairs are delayed until the center transition of the incoming data bipolar pulse pair is detected. The first half of the incoming data bipolar pulse pair appears on the line undisturbed while the second half of the same pulse pair is "overwritten" by the first half of the outgoing data bipolar pulse pair.

REFERENCES:
patent: 3165590 (1965-01-01), Brooks et al.
patent: 3553386 (1971-01-01), Golembeski
patent: 3701854 (1972-10-01), Anderson

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