Multiplex communications – Wide area network – Packet switching
Patent
1981-12-23
1984-06-26
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370123, 179 2DP, 333131, H04B 150
Patent
active
044569858
ABSTRACT:
Voice-band signals are coupled to and from a telephone subscriber line via a low-pass filter which has a shunt capacitor coupled across the line. In order to simultaneously couple above voice-band signals to and from the line, this capacitor is coupled to the line via windings of a transformer. The above voice-band signals are coupled via at least one series inductor and the transformer to the line, the inductor being series resonant with the filter capacitor, as reflected through the transformer, at the above voice-band signal frequency. Two such series inductors provide for efficient coupling of signals to and from the line at two different frequencies, facilitating simultaneous transmission and reception of above voice-band signals, for example FSK data signals, via the line. Parallel resonant circuits are also provided to prevent degradation of the filter characteristics in the voice-band and to prevent coupling of receive frequency components from the transmit signal to the receive signal line.
REFERENCES:
patent: 4368361 (1983-01-01), Chung et al.
patent: 4378470 (1983-03-01), Murto et al.
Bunner Charles B. D.
Carsten Ralph T.
Nakhla Michael S.
Haley R. John
Northern Telecom Limited
Olms Douglas W.
Rokoff Kenneth I.
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