Line sharing multipoint pots splitter amplifier-based coupler
AssigneeParadyne Corporation
InventorsThomas J. Bingel, Gordon Bremer
Life of this patent
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Abstract
The eavesdropping prevention system and method of the present invention provides for shunting leakage signals in a communication system. The amplifier-based coupler is constructed with amplifiers configured with a nearly-zero impedance path which effectively prevents the propagation of a leakage signal onto other communication connections which are coupled to the same communication device. Leakage signals are attenuated due to the nearly-zero impedance path, rather than propagating through the higher impedance communication connections.
Claims20
A system for attenuating leakage signals in a communication system, comprising:
- a multiple virtual line (MVL) transmitter configured to provide signals to a plurality of subscriber loops, each subscriber loop having a tip connection and a ring connection, the MVL transmitter having a first transmit output (Tx+) and a second transmit output (Tx−):
- an amplifier-based coupler coupled between the MVL transmitter and the plurality of subscriber loops, the amplifier-based coupler comprising:
- a first amplifier having an output at least coupled to each tip connection of in the plurality of subscriber loops and at least one input coupled to the Tx+ output of the MVL transmitter, and configured to have a nearly-zero impedance characteristic;
- and
- a second amplifier having an output at least coupled to each ring connection in the plurality of subscriber loops and at least one input coupled to the Tx− output of the MVL transmitter, and configured to have a nearly-zero impedance characteristic,
- such that at least one leakage signal originating on a first subscriber loop in said plurality of subscriber loops cannot propagate from subscriber loop to a second subscriber loop in said plurality of subscriber loops.
A method for shunting leakage signals in a communication system, the method comprising the steps of:
- receiving a differential digital signal, said differential digital signal composed of a plurality of subscriber signals, each subscriber signal associated with a different subscriber;
- coupling a first amplifier between the positive differential digital signal and each tip connection in a plurality of subscriber loops, said first amplifier having a nearly-zero impedance characteristic;
- coupling a second amplifier between the negative differential digital signal and each ring connection in the plurality of subscriber loops, said second amplifier having a nearly-zero impedance characteristic;
- and
- shunting at least one leakage signal originating on a first subscriber loop in the plurality of subscriber loops away from a second subscriber loop in the plurality of subscriber loops.
A system for shunting leakage signals in a communication system, comprising:
- means for receiving a differential digital signal from a digital device, said differential digital signal composed of a plurality of subscriber signals, each subscriber signal associated with a different subscriber, said differential digital signal concurrently providing voice service to each of the subscribers;
- means for coupling a first amplifier between the positive differential digital signal and each tip connection in a plurality of subscriber loops, said first amplifier having a nearly-zero impedance characteristic;
- means for coupling a second amplifier between the negative differential digital signal and each ring connection in the plurality of subscriber loops, said second amplifier having a nearly-zero impedance characteristic;
- and
- means for shunting such that at least one leakage signal originating on a first subscriber loop in the plurality of subscriber loops away from a second subscriber loop in the plurality of subscriber loops coupled to said digital device.
Dependencies are inferred from the claim text.