Multi-line ADSL modulation

• US 6,507,608 B1
• Filed: 02/22/2001
• Issued: 01/14/2003
• Est. Priority Date: 02/23/2000
• Status: Expired due to Term

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: 2Wire, Inc. (CommScope Holding Company, Inc.)
• Inventors: Norrell, Andrew L.
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Tran, Khanh Cong
• Application Number:
  US09/791,970
• Time in Patent Office: 691 Days
• Field of Search: 375/219, 375/220, 375/222, 375/257, 375/258, 370/200, 370/357, 370/439, 370/366, 370/367, 370/513, 370/514, 379/93.01, 379/93.07, 379/93.09, 379/93.11, 379/100.12
• US Class Current: 375/219
• CPC Class Codes: H04L 25/028 Arrangements specific to the transmitter end
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04L 5/20 using different combinations of lines, e.g. phantom working

Abstract

A system and method are disclosed for transmitting data over multiple twisted pairs and receiving the data at a single receiver. In one embodiment, data is transmitted over an additional channel existing as the difference between the average voltages of two twisted pairs.

Claims

1. A method of transmitting data over multiple twisted pairs, the method comprising:

transmitting Digital Subscriber Line (DSL) signals over a first twisted pair;

transmitting DSL signals over a second twisted pair;

creating an additional channel defined by the difference in average voltage between the first and second twisted pairs; and

transmitting DSL signals over the additional channel.

2. The method of transmitting data over multiple twisted pairs according to claim 1, wherein downstream signals are transmitted over the first and second pairs and upstream signals are transmitted over the additional channel.

3. The method of transmitting data over multiple twisted pairs according to claim 1, wherein real portions of transmited signals are transmitted over the first pair and imaginary portions of transmitted signals are transmitted over the second pair.

4. The method of transmitting data over multiple twisted pairs according to claim 1, wherein the transmitted data passes between an ATU-R and an ATU-C over the first and second pairs.

5. A system for transmitting signals over first and second twisted pairs, the system comprising:

a transceiver having first and second line receivers and a line driver;

a first transformer disposed between the first twisted pair and the first line receiver;

a second transformer disposed between the second twisted pair and the second line receiver; and

a third transformer disposed between center taps of the first and second transformers and the line driver to permit the line driver to transmit signals over a channel existing between the average voltage of the first pair and the average voltage of the second pair.

6. The system for transmitting signals according to claim 5 wherein the transceiver further comprises an ATU-R.

7. The system for transmitting signals according to claim 5 wherein the signals further comprise ADSL signals.

8. A system for transmitting signals over first and second twisted pairs, the system comprising:

a transceiver having first and second line drivers and a line receiver;

a first transformer disposed between the first twisted pair and the first line driver;

a second transformer disposed between the second twisted pair and the second line driver; and

a third transformer disposed between center taps of the first and second transformers and the line receiver to permit the line receiver to receive signals over a channel existing between the average voltage of the first pair and the average voltage of the second pair.

9. The system for transmitting signals according to claim 8 wherein the transceiver further comprises an ATU.

10. The system for transmitting signals according to claim 8 wherein the signals further comprise ADSL signals.

11. A system for transmitting ADSL signals between an ATU-R and an ATU-C over first and second twisted pairs, the system comprising:

an ATU-R having first and second ATU-R line receivers and an ATU-R line driver;

a first transformer disposed between the first twisted pair and the first ATU-R line receiver;

a second transformer disposed between the second twisted pair and the second ATU-R line receiver; and

a third transformer disposed between center taps of the first and second transformers and the ATU-R line driver to permit the ATU-R line driver to transmit signals over a channel existing between the average voltage of the first pair and the average voltage of the second pair;

an ATU-C having first and second ATU-C line drivers and an ATU-C line receiver;

a fourth transformer disposed between the first twisted pair and the first ATU-C line driver;

a fifth transformer disposed between the second twisted pair and the second ATU-C line driver; and

a sixth transformer disposed between center taps of the fourth and fifth transformers and the ATU-C line receiver to permit the ATU-C line receiver to receive signals over the channel existing between the average voltage of the first pair and the average voltage of the second pair.

12. A method of transmitting data symbols over first and second twisted pair conductors, the method comprising:

dividing each data symbol to be transmitted into real and imaginary components;

transmitting the real component of each data symbol over the first twisted pair conductor with a transmitter;

transmitting the imaginary component of each data symbol over the second twisted pair with the transmitter.

13. A system for transmitting data over multiple twisted pairs, the system comprising:

means for transmitting DSL signals over a first twisted pair;

means for transmitting DSL signals over a second twisted pair;

means for creating an additional channel defined by the difference in average voltage between the first and second twisted pairs; and

means for transmitting DSL signals over the additional channel.

14. An ADSL transceiver comprising:

a first line driver coupled to a first twisted pair for transmitting ASDL signals onto the first twisted pair;

a second line driver coupled to a second twisted pair for transmitting ADSL signals onto the second twisted pair;

a line receiver coupled to an additional channel, defined by the difference in average voltage between the first and second twisted pairs, for receiving ASDL signals from the additional channel, the first and second line drivers and the line receiver being controlled by one digital signal processor.