System and method for determining the transmit power of a communication device operating on digital subscriber lines

• US 6,636,603 B1
• Filed: 07/30/1999
• Issued: 10/21/2003
• Est. Priority Date: 07/30/1999
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Milbrandt, Celite
• Primary Examiner(s): NGUYEN, DUC MINH
• Application Number:
  US09/364,775
• Time in Patent Office: 1,544 Days
• Field of Search: 379/399.01, 379/399.02, 379/414, 379/416, 379/417, 455/67.1, 455/115, 455/226--22, 370/201, 370/252, 370/318, 375/219-222, 375/227
• US Class Current: 379/399.01
• CPC Class Codes: H04B 3/46 Monitoring; Testing
• CPC Class Codes: H04M 1/24 Arrangements for testing
• CPC Class Codes: H04M 19/001 Current supply source at the exchanger providing current to substations

Abstract

A system for determining the transmit power of a communication device operating on a twisted pair subscriber line includes a communication server coupled to a first subscriber line and a second subscriber line. The communication server comprises a communication device that communicates a signal using the first subscriber line. A memory coupled to the communication server stores noise information and cross-channel-coupling information for the first subscriber line and the second subscriber line. A processor coupled to the memory determines the transmit power of the communication device based upon the noise information and the cross-channel-coupling information.

Claims

1. A communication system for determining the transmit power of a communication device operating on a twisted pair subscriber line, comprising:

a communication server coupled to a first subscriber line and a second subscriber line, the communication server comprising a communication device operable to communicate a signal using the first subscriber line;

a memory coupled to the communication server and storing noise information and cross-channel-coupling information for the first subscriber line and the second subscriber line; and

a processor coupled to the memory and operable to determine the transmit power of the communication device based upon the noise information and the cross-channel-coupling information.

2. The communication system of claim 1, wherein the processor determines the transmit power of the communication device proportional to the noise information for the first subscriber line and inversely proportional to the cross-channel-coupling information.

3. The communication system of claim 1, further comprising a second communication device operating on the first subscriber line, wherein the second communication device resides at a subscriber premises coupled to the first subscriber line and the processor is further operable to determine the transmit power of the second communication device based upon the noise information and the cross-channel-coupling information.

4. The communication system of claim 1, wherein the first subscriber line and the second subscriber line each comprise a common binder group segment.

5. The communication system of claim 1, wherein:

the first subscriber line supports communication using a particular frequency spectrum; and

the communication device is operable to communicate the signal at a sub-frequency of the frequency spectrum and to receive noise information for the signal measured for the sub-frequency of the frequency spectrum.

6. The communication system of claim 5, wherein the processor is further operable to determine the noise information of the first subscriber line for the frequency spectrum based upon the noise information of the signal measured for the sub-frequency of the frequency spectrum.

7. The communication system of claim 1, wherein the communication device supports communicating data using a plurality of communication protocols and the processor is further operable to select a particular communication protocol based upon the determined transmit power of the communication device.

8. The communication system of claim 7, wherein the selected communication protocol comprises one of Asymmetric Digital Subscriber Line or Symmetric Digital Subscriber Line.

9. The communication system of claim 1, wherein the processor is further operable to determine the data rate capacity of the first subscriber line using the determined transmit power of the communication device.

10. A method for determining the transmit power of a communication device operating on a twisted pair subscriber line, comprising:

storing noise information for a first subscriber line and a second subscriber line;

storing cross-channel-coupling information for the first subscriber line and the second subscriber line; and

determining the transmit power of a communication device operating on the first subscriber line based upon the noise information and the cross-channel-coupling information.

11. The method of claim 10, wherein the step of determining comprises determining the transmit power of the communication device proportional to the noise information for the first subscriber line and inversely proportional to the cross-channel-coupling information.

12. The method of claim 10, wherein the communication device is associated with a communication server coupled to the first subscriber line.

13. The method of claim 10, wherein the communication device is associated with a subscriber premises coupled to the first subscriber line.

14. The method of claim 10, wherein the first subscriber line and the second subscriber line each comprise a common binder group segment.

15. The method of claim 10, wherein:

the first subscriber line supports communication using a particular frequency spectrum; and

the step of determining the transmit power of the communication device comprises determining the transmit power of the communication device at a sub-frequency of the frequency spectrum.

16. The method of claim 10, wherein the first subscriber line supports communication using a particular frequency spectrum, the method further comprising:

communicating a signal at a sub-frequency of the frequency spectrum;

measuring noise information of the signal for the sub-frequency of the frequency spectrum; and

determining the noise information of the first subscriber line for the frequency spectrum based upon the noise information of the signal measured for the sub-frequency of the frequency spectrum.

17. The method of claim 10, wherein the communication device supports communicating data using a plurality of communication protocols and further comprising selecting a particular communication protocol based upon the determined transmit power of the communication device.

18. The method of claim 17, wherein the selected communication protocol comprises one of Asymmetric Digital Subscriber Line or Symmetric Digital Subscriber Line.

19. The method of claim 10, further comprising determining the data rate capacity of the first subscriber line using the determined transmit power of the communication device.

20. A communication facility for determining the transmit power of a communication device operating on a twisted pair subscriber line, comprising:

a memory storing noise information and cross-channel-coupling information for a first subscriber line and a second subscriber line; and

a processor coupled to the memory and operable to determine the transmit power of a communication device operating on the first subscriber line based upon the noise information and the cross-channel-coupling information.

21. The communication facility of claim 20, wherein the processor determines the transmit power of the communication device proportional to the noise information for the first subscriber line and inversely proportional to the cross-channel-coupling information.

22. The communication facility of claim 20, further comprising a second communication device operating on the first subscriber line, wherein the second communication device is associated with a subscriber premises coupled to the first subscriber line and the processor is further operable to determine the transmit power of the second communication device based upon the noise information and the cross-channel-coupling information.

23. The communication facility of claim 20, wherein the first subscriber line and the second subscriber line each comprise a common binder group segment.

24. The communication facility of claim 20, wherein:

the first subscriber line supports communication using a particular frequency spectrum; and

the communication device is operable to communicate a signal at a sub-frequency of the frequency spectrum and to receive noise information for the signal measured for the sub-frequency of the frequency spectrum.

25. The communication facility of claim 24, wherein the processor is further operable to determine the noise information of the first subscriber line for the frequency spectrum based upon the noise information of the signal measured for the sub-frequency of the frequency spectrum.

26. The communication facility of claim 20, wherein the communication device supports communicating data using a plurality of communication protocols and the processor is further operable to select a particular communication protocol based upon the determined transmit power of the communication device.

27. The communication facility of claim 26, wherein the selected communication protocol comprises one of Asymmetric Digital Subscriber Line or Symmetric Digital Subscriber Line.

28. The communication facility of claim 20, wherein the processor is further operable to determine the data rate capacity of the first subscriber line using the determined transmit power of the communication device.