Telephone circuit
AssigneeNorthern Telecom Limited
InventorsGuy J. Chaput, Edward M. Sich
Life of this patent
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Abstract
Telephone circuit using a transconductance switch in a high current line with the voice network, and a dial network in a low current line with the control input of the switch to provide dial input signals at the control input and send dial pulse signalling along the high current line through the voice network. The voice network includes a current clamp to stabilize the high current through the switch to the voice network sufficiently quickly to establish the desired waveform during dialling.
Claims12
A telephone circuit comprising a solid state voice network, a transconductance switch in series in a high current line with the voice network for dial pulse signalling through the voice network, and a dial network associated with the control input of the transconductance switch to provide low current dial pulse signalling at the control input, and the voice network includes a current clamp to stabilize the high current through the transconductance switch and the voice network to establish a desired loop signal waveform during dialling.
Dependencies are inferred from the claim text.