Line sharing multipoint pots splitter amplifier-based coupler

Details Line sharing multipoint pots splitter amplifier-based coupler Line sharing multipoint pots splitter amplifier-based coupler

2006-06-20

2006-06-20

Tran, Sinh (Department: 2646)

Telephonic communications

Subscriber line or transmission line interface

C379S387010, C379S093050

Reexamination Certificate

active

07065205

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.

REFERENCES:
patent: 4293739 (1981-10-01), Iijima
patent: 4637035 (1987-01-01), Betts
patent: 5479504 (1995-12-01), Nakano et al.
patent: 5920615 (1999-07-01), Nolde
patent: 6088430 (2000-07-01), McHale
patent: 6310953 (2001-10-01), Yoshida et al.
patent: 6707822 (2004-03-01), Fadavi-Ardekani et al.

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