Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent
1986-05-22
1988-10-04
Dwyer, James L.
Telephonic communications
Plural exchange network or interconnection
Interexchange signalling
379413, 379398, 379324, H04M 710
Patent
active
047760079
ABSTRACT:
A trunk circuit is disclosed for coupling a bidirectional lead pair, such as balanced tip and ring leads, to a pair of unidirectional leads such as unbalanced input and output leads. The trunk circuit incorporates a small inexpensive transformer for effecting this coupling and for providing large common mode signal isolation and correct longitudinal balance. Circuitry is provided for matching the nominal balanced AC and DC line impedances. The trunk circuit also provides circuitry for generating dial pulse signals under control of a microprocessor or other external controller.
REFERENCES:
patent: 4074087 (1978-02-01), Bluke, Jr. et al.
patent: 4126765 (1978-11-01), Calder et al.
Oddy Douglas C.
Styrna Zbigniew B.
Dwyer James L.
Mitel Corp.
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