Network data filtering

• US 6,298,037 B1
• Filed: 12/14/1998
• Issued: 10/02/2001
• Est. Priority Date: 12/14/1998
• Status: Expired due to Term

• Current Assignee: Ikanos Communications Incorporated (Qualcomm, Inc.)
• Original Assignee: Analog Devices, Inc.
• Inventors: Sharifi, Kamran
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): PHAM, BRENDA H
• Application Number:
  US09/211,533
• Time in Patent Office: 1,023 Days
• Field of Search: 370/352, 370/353, 370/355, 370/356, 370/358, 370/204, 370/463, 370/464, 370/465, 370/480, 370/488, 370/522, 370/210, 370/243, 370/246, 370/274
• US Class Current: 370/210
• CPC Class Codes: H03H 7/1766 Parallel LC in series path H03H7/1783 takes precedence
• CPC Class Codes: H03H 7/427 Common-mode filters H02J3/01 and H02M1/126 takes precedence

Abstract

An electronic filter has an input connector adapted for electrical connection to a complimentary output connector of an asymmetrical digital subscriber line. The input connector has an input voltage node for providing electrical input signals to the electronic filter. Similarly, the filter has an output connector adapted for electrical connection to a complimentary input connector of a data receiving device. The output connector has an output voltage node for providing electrical output signals from the electronic filter. The filter selectively passes frequency components of the electrical signals, frequency components below a predetermined corner frequency passing from the input connector to the output connector, frequency components above the predetermined corner frequency not passing from the input connector to the output connector.

Claims

1. An electronic filter adapted for receiving electrical signals transmitted by a data network and for passing low frequency components of the signals to a data receiving device, the electronic filter comprising:

an input connector adapted for electrical connection to a complimentary output connector of an asymmetrical digital subscriber line, the input connector having an input voltage node for providing electrical input signals to the electronic filter;

an output connector adapted for electrical connection to a complimentary input connector of a data receiving device, the output connector having an output voltage node for providing electrical output signals from the electronic filter; and

an electrical signal processing path extending from the input voltage node to the output voltage node, electronic elements disposed along the electrical signal processing path, the electronic elements adapted to selectively pass frequency components of the electrical signals, frequency components below a predetermined comer frequency passing from the input connector to the output connector, frequency components above the predetermined comer frequency not passing from the input connector to the output connector;

said electronic filter being a modular unit electrically connectable between the complimentary output connector and the complimentary input connector;

said electronic filter having first, second, and third stages, said first, second, and third stages being connected in serial;

said first, second, and third stages each having a corresponding high voltage side and a corresponding low voltage side;

said first, second, and third stages each having an inductive transformer wherein a first winding of the transformer is connected to the high voltage side and a second winding of the transformer is connected to the low voltage side;

said first, second, and third stages each having a capacitor connected across the high voltage side and the low voltage side;

said second and third stages each having a capacitor connected across the first winding of the transformer connected to the high voltage side.

2. The electronic filter of claim 1 further comprising:

a housing, each of the input and output connectors extending through the housing.

3. The electronic filter of claim 1 wherein each of the input and output voltage nodes further comprise corresponding wire sections electrically connected to corresponding contact terminal portions, each of the contact terminal portions adapted to contact a corresponding contact terminal portion of the complimentary output and input connectors.

4. The electronic filter of claim 1 wherein each of the input and output connectors further comprises an RJ-11 connector.

5. The electronic filter of claim 1 wherein the input connector is a pair of electrical contacts.

6. The electronic filter of claim 1 wherein the electronic filter further comprises a first impedance adapted to substantially match a second impedance of a local loop of the asymmetric digital subscriber line.

7. The electronic filtering device of claim 1 wherein the input connector is integrally formed with the complimentary output connector.

8. The electronic filtering device of claim 1 further comprising a second output connector for providing unfiltered output signals, the second output connector having output an voltage node electrically connected to a corresponding input voltage node of the input connector.

9. The electronic filtering device of claim 1 further comprising an outlet adapted to be secured as a hardware fixture in the network, the plate defining an opening directly adjacent to the output connector to provide a circuit path from the electrical components to the data receiving device through the opening.

10. The electronic filtering device of claim 9 wherein the electronic components are mounted on a side of the plate.

11. The electronic filtering device of claim 9 further comprising a second output connector for providing unfiltered output signals, the second output connector having an output voltage node electrically connected to the input voltage node of the input connector.

12. The electronic filtering device of claim 11 wherein the plate defines a second opening directly adjacent to the second output connector to provide a second circuit path from the input voltage node to another data receiving device through the opening.

13. A modular electronic filtration device adapted for receiving electrical signals transmitted by a data network and for passing low frequency components of the signals to a data receiving device, the electronic filter comprising:

an electronic filter;

said electronic filter including,

an input adapted for electrical connection to a terminal output of a subscriber line, the input having an input voltage node for providing electrical input signals to the electronic filter,

an output for electrical connection to another input of a data receiving device, the output having an output voltage node for providing electrical output signals from the electronic filter, and

an electrical signal processing path extending from the input voltage node to the output voltage node, electronic elements disposed along the electrical signal processing path, the electronic elements adapted to selectively pass frequency components of the electrical signals, frequency components below a predetermined comer frequency passing from the input connector to the output connector, frequency components above the predetermined comer frequency not passing from the input connector to the output connector; and

an output connector electrically connected to the output of the filter, the output connector constructed and arranged to be in electrical communication with the terminal output of the subscriber line

said electronic filter having first, second, and third stages, said first, second, and third stages being connected in serial;

said first, second, and third stages each having a corresponding high voltage side and a corresponding low voltage side;

said first, second, and third stages each having an inductive transformer wherein a first winding of the transformer is connected to the high voltage side and a second winding of the transformer is connected to the low voltage side;

said first, second, and third stages each having a capacitor connected across the high voltage side and the low voltage side;

said second and third stages each having a capacitor connected across the first winding of the transformer connected to the high voltage side.

14. The electronic filter of claim 13, wherein the terminal output connector is a jack.

15. The device of claim 13 further comprising a second output connector electrically connected to the input of the electronic filter, the second output connector adapted for electrical connection to the terminal output of the subscriber line.

16. A system for receiving electrical signals transmitted by a network and for passing low frequency components of the electronic signals to a data receiving device, the system comprising:

an asymmetric digital subscriber line including a set of connecting lines extending from a main branch of the asynchronous digital subscriber line; and

an electronic filter having an input, an output, an electronic signal path extending from the input to the output, and electronic elements arranged along the signal processing path, the input electrically connected to one of the connecting lines of the set of connecting lines, the output adapted to electrically connect to the data receiving device;

said electronic elements being adapted to selectively pass frequency components of the electrical signals, frequency components below a predetermined corner frequency passing from the input to the output, frequency components above the predetermined corner frequency not passing from the input to the output;

said electronic filter having first, second, and third stages, said first, second, and third stages being connected in serial;

said first, second, and third stages each having a corresponding high voltage side and a corresponding low voltage side;

said first, second, and third stages each having an inductive transformer wherein a first winding of the transformer is connected to the high voltage side and a second winding of the transformer is connected to the low voltage side;

said first, second, and third stages each having a capacitor connected across the high voltage side and the low voltage side;

said second and third stages each having a capacitor connected across the first winding of the transformer connected to the high voltage side.

17. The system of claim 16 further comprising a data receiving device connected to the output of the electronic filter to utilize frequency components below the predetermined corner frequency passed by the electronic filter.

18. The system of claim 16 further comprising a second data receiving device connected to the terminal end of another of the connecting lines of the set of connecting lines, the second data receiving device capable of utilizing frequency components of the electronic signals above the predetermined corner frequency.

19. The system of claim 18 wherein the second data receiving device comprises an ADSL terminal unit remote in electrical communication with the asymmetric digital subscriber line.

20. A data network system comprising:

a provider node for transmitting and receiving electrical signals having a plurality of frequency channels;

a set of subscriber nodes for transmitting and receiving electrical signals having a plurality of frequency channels, each subscriber node of the set being in electrical communication with the provider node via a corresponding asymmetrical digital subscriber line; and

a subscriber node of the set having a data receiving device in electrical communication with the corresponding asymmetrical digital subscriber line via an electronic filter electrically connected between the data receiving device and the asymmetric digital subscriber line;

said electronic filter being adapted to selectively pass frequency components of the electrical signals, frequency components below a predetermined corner frequency passing from the input to the output, frequency components above the predetermined comer frequency not passing from the input to the output;

said electronic filter having first, second, and third stages, said first, second, and third stages being connected in serial;

said first, second, and third stages each having a corresponding high voltage side and a corresponding low voltage side;

said first, second, and third stages each having an inductive transformer wherein a first winding of the transformer is connected to the high voltage side and a second winding of the transformer is connected to the low voltage side;

said first, second, and third stages each having a capacitor connected across the high voltage side and the low voltage side;

said second and third stages each having a capacitor connected across the first winding of the transformer connected to the high voltage side.

21. The data network system of claim 20 wherein the subscriber node further comprising a second data receiving device electrically connected to the asymmetric digital subscriber line to receive unfiltered electrical signals from the provider node.

22. The data network system of claim 21 wherein the subscriber node further comprises a third data receiving device in electrical communication with the corresponding asymmetrical digital subscriber line via a second electronic filter electrically connected between the third data receiving device and the asymmetric digital subscriber line, the second electronic filter adapted to selectively pass frequency components of the electrical signals, frequency components below a predetermined corner frequency passing from the input to the output, frequency components above the predetermined corner frequency not passing from the input to the output.

23. The system of claim 22 further comprising a fourth data receiving device in electrical communication with the corresponding asymmetric digital subscriber line via the second data receiving device, wherein the second data receiving device is constructed and arranged to pass frequencies above the predetermined corner frequency to the fourth data receiving device.