Low-pass filtering device with integrated insulator and...

Details Low-pass filtering device with integrated insulator and... Low-pass filtering device with integrated insulator and...

2005-12-27

2005-12-27

Mei, Xu (Department: 2644)

Telephonic communications

Substation or terminal circuitry

Impedance matching or line equalizing

C379S424000, C379S442000, C379S093050, C370S488000

Reexamination Certificate

active

06980645

ABSTRACT:
A filtering device for a narrow-band terminal in a private installation connected to an access network carrying narrow-band services (analogue or ISDN) and broad-band services (xDSL or HomePNA). The device has a low-pass filter associated with an insulation enabling the device to have a high input impedance insulating the installation when the narrow-band terminal is on hook while allowing the ringing signal to pass. Applicable to private telephone-teledata installations.

REFERENCES:
patent: 3703610 (1972-11-01), Lakin et al.
patent: 3860757 (1975-01-01), Stewart
patent: 5025443 (1991-06-01), Gupta
patent: 5848150 (1998-12-01), Bingel
patent: 6477249 (2002-11-01), Williamson et al.
Cook et al., ADSL and VDSL Splitter Design and Telephony Performance; IEEE Journal; Dec. 1995; vol. 13, No. 9.

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