Multiplex communications – Wide area network – Packet switching
Patent
1982-08-13
1984-10-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
179170NC, H04B 158
Patent
active
044765576
ABSTRACT:
A duplex signaling circuit for signaling with respect to a line circuit includes a resistance bridge hybrid (22, 27, 28, 32) having a modified resistance makeup to reduce power consumption and improve longitudinal current immunity without altering conjugacy between signaling transmission (12) and receiving (17) connections to the bridge. An electronic relay emulator (86), which is responsive to bridge hybrid output signals representing received line circuit signals, provides relative immunity to noise and to pulse splitting for thereby relieving a hybrid balancing impedance capacitance (33) of those functions so that a compromise capacitor value can be selected for balancing a relatively wide range of signaling line circuits. A user-stepped, successive approximation, adjustment process for the balancing impedance is implemented in the signaling circuit.
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Operational Amplifiers Design and Applications, 1971, J. G. Graeme et al., pp. 119-120, 212-218, 355-357, 385-396.
AT&T Bell Laboratories
Olms Douglas W.
Phelan C. S.
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