Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1993-09-14
1996-04-16
Hofsass, Jeffery
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379324, 379399, H04M 1900
Patent
active
055090699
ABSTRACT:
A circuit is provided in telecommunication terminal equipment for splitting a limited supply of current received from a subscriber's line current among a plurality of functional circuits according to their priority rank. The circuit uses a differential pair of current delivering transistors and a special circuit to monitor the actual current of absorption of at least the functional circuit of highest rank to produce a control signal that is used for modifying the drive conditions of the current delivering transistors. All current exceeding the actual absorption needs of the highest rank functional circuit is distributed to the other functional circuits and the prior art practice of sinking unneeded current through a dissipative shunt voltage regulator associated with each functional circuit is avoided. This same principle may be advantageously applied also to functional circuits of progressively lesser rank of priority.
REFERENCES:
patent: 4813072 (1989-03-01), Moses et al.
TN Nachrichten, No, 91, 1987, Frankfurt, DE, pp. 3-14, Kramer et al., "TN-Terminals im neuen Design".
Castello Rinaldo
Tomasini Luciano
Dorny Brett N.
Driscoll David M.
Hofsass Jeffery
Morris James H.
Saint-Surin Jacques M.
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