Redundant power and data in a wired data telecommunincations network

• US 7,793,137 B2
• Filed: 12/23/2004
• Issued: 09/07/2010
• Est. Priority Date: 10/07/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Cafiero, Luca, Karam, Roger A.
• Primary Examiner(s): Wilson; Yolanda L
• Application Number:
  US11/022,266
• Publication Number:
  US 20060077888A1
• Time in Patent Office: 2,084 Days
• Field of Search: None
• US Class Current: 714/4.12
• CPC Class Codes: H04L 1/22 using redundant apparatus to increase reliability
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04L 41/06 Management of faults, events, alarms or notifications

Abstract

Redundancy of data and/or inline power in a wired data telecommunications network from a pair of network devices via a selection device is provided by communicating redundant signals with each of the pair of network devices and coupling ports of the first network device and corresponding ports of the second network device to paired inputs of the selection device. The selection device operates: 1) under the control of the pair of network devices, one acting as master and one as slave, the master selecting (for each port or for all ports) one of the two paired inputs and causing the selection device to communicate data and/or inline power via a third port of the selection device to a third network device receiving data connectivity and/or inline power from the selection device; or 2) to route two redundant signals to a third network device which then selects one for use.

Claims

1. A method for providing redundancy in a wired data telecommunications network, the method comprising:

coupling a first interface of a first port of a redundancy selection device to a first port of a first network device, the first network device configured as a first power sourcing equipment (PSE) device;

coupling a second interface of the first port of the redundancy selection device to a first port of a second network device, the second network device configured as a second PSE device;

coupling a third interface of the first port of the redundancy selection device to a first port of a third network device;

coupling data and power communicated with the first interface of the first port of the redundancy selection device to communicate data and power with the third interface of the first port of the redundancy selection device;

detecting a failure in the flow of data and power; and

activating the redundancy selection device in response to said detecting to subsequently couple data and power communicated over the second interface of the first port of the redundancy selection device to communicate data and power with the third interface;

wherein detecting a failure in the flow of data and power includes detecting a loss of power that originates from the first PSE device and is destined for the third network device, the third network device configured as a powered device (PD); and

wherein activating the redundancy selection device in response to said detecting to subsequently couple data and power communicated over the second interface of the first port of the redundancy selection device to communicate data and power with the third interface includes restoring power to the PD with power from the second PSE device.

2. The method of claim 1, wherein:

said detecting detects a failure in the communication of data and power between the first port of the first network device and the third network device.

3. The method of claim 1, wherein said detecting takes place at one or more of the first, second and third network devices.

4. The method of claim 1, wherein power for said redundancy selection device is provided as inline power from at least one of the first network device, the second network device and the third network device.

5. The method of claim 1, wherein power for said redundancy selection device is provided as inline power from at least one of said first network device and said second network device.

6. The method of claim 1, further comprising:

notifying a network control point in response to said detecting.

7. The method of claim 6, wherein said notifying is performed using the wired data telecommunications network to send a message from one or more of the first, second and third network devices.

8. The method of claim 6, wherein said notifying is performed wirelessly.

9. The method of claim 6, wherein said notifying is performed using a wireless telecommunications link from the redundancy selection device to a wireless node coupled to the wired data telecommunications network, and from the node to the network control point.

10. The method of claim 1, further comprising:

providing identical data signals (except for the portions of signals intended to represent an address related to the first and second network devices) to the first port of the first network device and to the first port of the second network device.

11. The method of claim 1, wherein:

the first interface includes;

a 1^st node and a 2^nd node adapted to be coupled to a 1^st and a 2^nd conductor of a 1^st pair of conductors;

a 3^rd node and a 4^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 2^nd pair of conductors;

the second interface includes;

a 5^th node and a 6^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 3^rd pair of conductors;

a 7^th node and an 8^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 4^th pair of conductors; and

the third interface includes;

a 9^th node and a 10^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 5^th pair of conductors;

an 11^th node and a 12^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 6^th pair of conductors; and

wherein

each conductor of said 1^st through 6^th pairs of conductors includes two portions separated by a series-connected diode, each said diode associated with a pair of conductors is oriented to conduct in the same direction, and wherein biasing circuitry is provided to selectively forward-bias the diodes in the pairs of conductors.

12. The method of claim 11, wherein the diodes are forward-biased with the flow of inline power.

13. The method of claim 11, wherein the diodes are forward-biased by means other than the flow of inline power.

14. The method of claim 1, further comprising:

coupling the first network device and the second network device with a data link.

15. The method of claim 14, wherein the data link does not traverse the redundancy selection device.

16. The method of claim 14, wherein the data link traverses the redundancy selection device.

17. The method of claim 16, further comprising:

coupling the first network device and the second network device with an additional data link which does not traverse the redundancy selection device.

18. The method of claim 1, wherein the flow of inline power from the first network device couples the first network device with the third network device.

19. An apparatus for providing redundancy in a wired data telecommunications network, the apparatus comprising:

means for coupling a first interface of a first port of a redundancy selection device to a first port of a first network device, the first network device configured as a first power sourcing equipment (PSE) device;

means for coupling a second interface of the first port of the redundancy selection device to a first port of a second network device, the second network device configured as a second PSE device;

means for coupling a third interface of the first port of the redundancy selection device to a first port of a third network device;

means for coupling data and power communicated with the first interface of the first port of the redundancy selection device to communicate data and power with the third interface of the first port of the redundancy selection device;

means for detecting a failure in the flow of data and power; and

means for activating the redundancy selection device responsive to said means for detecting to subsequently couple data and power communicated over the second interface of the first port of the redundancy selection device to communicate data and power with the third interface;

wherein the means for detecting a failure in the flow of data and power includes means for detecting a loss of power that originates from the first PSE device and is destined for the third network device, the third network device configured as a powered device (PD); and

wherein means for activating the redundancy selection device in response to said detecting to subsequently couple data and power communicated over the second interface of the first port of the redundancy selection device to communicate data and power with the third interface includes means for restoring power to the PD with power from the second PSE device.

20. The apparatus of claim 19, wherein:

said means for detecting detects a failure in the communication of data and power between the first port of the first network device and the third network device.

21. The apparatus of claim 19, wherein said means for detecting detects at one or more of the first, second and third network devices.

22. The apparatus of claim 19, wherein power for said redundancy selection device is provided as inline power from at least one of the first network device, the second network device and the third network device.

23. The apparatus of claim 19, wherein power for said redundancy selection device is provided as inline power from at least one of said first network device and said second network device.

24. The apparatus of claim 19, further comprising:

means for notifying a network control point responsive to said means for detecting.

25. The apparatus of claim 24, wherein said means for notifying is performed using the wired data telecommunications network to send a message from one or more of the first, second and third network devices.

26. The apparatus of claim 24, wherein said means for notifying is performed wirelessly.

27. The apparatus of claim 24, wherein said means for notifying operates using a wireless telecommunications link from the redundancy selection device to a wireless node coupled to the wired data telecommunications network, and from the node to the network control point.

28. The apparatus of claim 19, further comprising:

means for providing identical data signals (except for the portions of signals intended to represent an address related to the first and second network devices) to the first port of the first network device and to the first port of the second network device.

29. The apparatus of claim 19, wherein:

the first interface includes;

a 1^st node and a 2^nd node adapted to be coupled to a 1^st and a 2^nd conductor of a 1^st pair of conductors;

a 3^rd node and a 4^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 2^nd pair of conductors;

the second interface includes;

a 5^th node and a 6^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 3^rd pair of conductors;

a 7^th node and an 8^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 4^th pair of conductors; and

the third interface includes;

a 9^th node and a 10^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 5^th pair of conductors;

an 11^th node and a 12^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 6^th pair of conductors; and

wherein

each conductor of said 1^st through 6^th pairs of conductors includes two portions separated by a series-connected diode, each said diode associated with a pair of conductors is oriented to conduct in the same direction, and wherein biasing circuitry is provided to selectively forward-bias the diodes in the pairs of conductors.

30. The apparatus of claim 29, wherein the diodes are forward-biased with the flow of inline power.

31. The apparatus of claim 29, wherein the diodes are forward-biased by means other than the flow of inline power.

32. The apparatus of claim 19, further comprising:

means for coupling the first network device and the second network device with a data link.

33. The apparatus of claim 32, wherein the data link does not traverse the redundancy selection device.

34. The apparatus of claim 32, wherein the data link traverses the redundancy selection device.

35. The apparatus of claim 34, further comprising:

means for coupling the first network device and the second network device with an additional data link which does not traverse the redundancy selection device.

36. The apparatus of claim 19, wherein the flow of inline power from the first network device couples the first network device with the third network device.

37. A system for providing redundancy in a wired data telecommunications network, the system comprising:

circuitry for coupling a first interface of a first port of a redundancy selection device to a first port of a first network device, the first network device configured as a first power sourcing equipment (PSE) device;

circuitry for coupling a second interface of the first port of the redundancy selection device to a first port of a second network device, the second network device configured as a second PSE device;

circuitry for coupling a third interface of the first port of the redundancy selection device to a first port of a third network device;

circuitry for coupling data and power communicated with the first interface of the first port of the redundancy selection device to communicate data and power with the third interface of the first port of the redundancy selection device;

circuitry for detecting a failure in the flow of data and power; and

circuitry for activating the redundancy selection device responsive to said circuitry for detecting to subsequently couple data and power communicated over the second interface of the first port of the redundancy selection device to communicate data and power with the third interface;

wherein circuitry for detecting a failure in the flow of data and power includes circuitry for detecting a loss of power that originates from the first PSE device and is destined for the third network device, the third network device configured as a powered device (PD); and

wherein circuitry for activating the redundancy selection device in response to said detecting to subsequently couple data and power communicated over the second interface of the first port of the redundancy selection device to communicate data and power with the third interface includes circuitry for restoring power to the PD with power from the second PSE device.

38. The system of claim 37, wherein:

said circuitry for detecting detects a failure in the communication of data and power between the first port of the first network device and the third network device.

39. The system of claim 37, wherein said circuitry for detecting detects at one or more of the first, second and third network devices.

40. The system of claim 37, wherein power for said redundancy selection device is provided as inline power from at least one of the first network device, the second network device and the third network device.

41. The system of claim 37, wherein power for said redundancy selection device is provided as inline power from at least one of said first network device and said second network device.

42. The system of claim 37, further comprising:

circuitry for notifying a network control point responsive to said circuitry for detecting.

43. The system of claim 42, wherein said circuitry for notifying utilizes the wired data telecommunications network to send a message from one or more of the first, second and third network devices.

44. The system of claim 42, wherein said circuitry for notifying utilizes wireless communications.

45. The system of claim 42, wherein said circuitry for notifying utilizes a wireless telecommunications link from the redundancy selection device to a wireless node coupled to the wired data telecommunications network, and from the node to the network control point.

46. The system of claim 37, further comprising:

circuitry for providing identical data signals (except for the portions of signals intended to represent an address related to the first and second network devices) to the first port of the first network device and to the first port of the second network device.

47. The system of claim 37, wherein:

the first interface includes;

a 1^st node and a 2^nd node adapted to be coupled to a 1^st and a 2^nd conductor of a 1^st pair of conductors;

a 3^rd node and a 4^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 2^nd pair of conductors;

the second interface includes;

a 5^th node and a 6^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 3^rd pair of conductors;

a 7^th node and an 8^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 4^th pair of conductors; and

the third interface includes;

a 9^th node and a 10^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 5^th pair of conductors;

an 11^th node and a 12^th node adapted to be coupled to a 1^st and a 2^nd conductor of a 6^th pair of conductors; and

wherein

each conductor of said 1^st through 6^th pairs of conductors includes two portions separated by a series-connected diode, each said diode associated with a pair of conductors is oriented to conduct in the same direction, and wherein biasing circuitry is provided to selectively forward-bias the diodes in the pairs of conductors.

48. The system of claim 47, wherein the diodes are forward-biased with the flow of inline power.

49. The system of claim 47, wherein the diodes are forward-biased by means other than the flow of inline power.

50. The system of claim 37, further comprising:

circuitry for coupling the first network device and the second network device with a data link.

51. The system of claim 50, wherein the data link does not traverse the redundancy selection device.

52. The system of claim 50, wherein the data link traverses the redundancy selection device.

53. The system of claim 52, further comprising:

circuitry for coupling the first network device and the second network device with an additional data link which does not traverse the redundancy selection device.

54. The system of claim 37, wherein the flow of inline power from the first network device couples the first network device with the third network device.

55. A method for providing redundancy in a wired data telecommunications network, the method comprising:

coupling a first interface of a first port of a redundancy selection device to a first port of a first network device, the first interface providing four pairs of connectivity between the first port of the first network device and the first port of the redundancy selection device, the first network device configured as a first power sourcing equipment (PSE) device;

coupling a second interface of the first port of the redundancy selection device to a first port of a second network device, the second interface providing two pairs of connectivity between the first port of the second network device and the first port of the redundancy selection device, the second network device configured as a second PSE device;

coupling a third interface of a first port of a redundancy selection device to a first port of a third network device, the third interface providing four pairs of connectivity between the first port of the third network device and the third port of the redundancy selection device;

coupling data and power communicated with the first interface of the first port of the redundancy selection device to communicate data and power with a third interface of the first port of the redundancy selection device;

detecting a fault in the flow of data and power through the first port of the first network device; and

activating the redundancy selection device in response to said detecting to subsequently;

(1) provide two pairs of connectivity between the first port of the third network device and the first port of the redundancy selection device; and

(2) provide two pairs of connectivity between the first port of the third network device and the first port of the second network device;

wherein detecting a fault in the flow of data and power through the first port of the first network device includes detecting a loss of power that originates from the first PSE device and is destined for the third network device, the third network device configured as a powered device (PD); and

wherein activating the redundancy selection device in response to said detecting to subsequently;

(1) provide two pairs of connectivity between the first port of the third network device and the first port of the redundancy selection device; and

(2) provide two pairs of connectivity between the first port of the third network device and the first port of the second network device includes restoring power to the PD with power from the second PSE device.

56. An apparatus for providing redundancy in a wired data telecommunications network, the apparatus comprising:

means for coupling a first interface of a first port of a redundancy selection device to a first port of a first network device, the first interface providing four pairs of connectivity between the first port of the first network device and the first port of the redundancy selection device, the first network device configured as a first power sourcing equipment (PSE) device;

means for coupling a second interface of the first port of the redundancy selection device to a first port of a second network device, the second interface providing two pairs of connectivity between the first port of the second network device and the first port of the redundancy selection device, the second network device configured as second PSE device;

means for coupling a third interface of a first port of a redundancy selection device to a first port of a third network device, the third interface providing four pairs of connectivity between the first port of the third network device and the third port of the redundancy selection device;

means for coupling data and power communicated with the first interface of the first port of the redundancy selection device to communicate data and power with a third interface of the first port of the redundancy selection device;

means for detecting a fault in the flow of data and power through the first port of the first network device; and

means for activating the redundancy selection device in response to said detecting to subsequently;

(1) provide two pairs of connectivity between the first port of the third network device and the first port of the redundancy selection device; and

(2) provide two pairs of connectivity between the first port of the third network device and the first port of the second network device;

wherein means for detecting a fault in the flow of data and power through the first port of the first network device includes means for detecting a loss of power that originates from the first PSE device and is destined for the third network device, the third network device configured as a powered device (PD); and

wherein means for activating the redundancy selection device in response to said detecting to subsequently;

(1) provide two pairs of connectivity between the first port of the third network device and the first port of the redundancy selection device; and

(2) provide two pairs of connectivity between the first port of the third network device and the first port of the second network device includes means for restoring power to the PD with power from the second PSE device.

57. A system for providing redundancy in a wired data telecommunications network, the system comprising:

circuitry for coupling a first interface of a first port of a redundancy selection device to a first port of a first network device, the first interface providing four pairs of connectivity between the first port of the first network device and the first port of the redundancy selection device, the first network device configured as a first power sourcing equipment (PSE) device;

circuitry for coupling a second interface of the first port of the redundancy selection device to a first port of a second network device, the second interface providing two pairs of connectivity between the first port of the second network device and the first port of the redundancy selection device, the second network device configured as a second PSE device;

circuitry for coupling a third interface of a first port of a redundancy selection device to a first port of a third network device, the third interface providing four pairs of connectivity between the first port of the third network device and the third port of the redundancy selection device;

circuitry for coupling data and power communicated with the first interface of the first port of the redundancy selection device to communicate data and power with a third interface of the first port of the redundancy selection device;

circuitry for detecting a fault in the flow of data and power through the first port of the first network device; and

circuitry for activating the redundancy selection device in response to said detecting to subsequently;

(1) provide two pairs of connectivity between the first port of the third network device and the first port of the redundancy selection device; and

(2) provide two pairs of connectivity between the first port of the third network device and the first port of the second network device;

wherein circuitry for detecting a fault in the flow of data and power through the first port of the first network device includes circuitry for detecting a loss of power that originates from the first PSE device and is destined for the third network device, the third network device configured as a powered device (PD); and

wherein circuitry for activating the redundancy selection device in response to said detecting to subsequently;

(1) provide two pairs of connectivity between the first port of the third network device and the first port of the redundancy selection device; and

(2) provide two pairs of connectivity between the first port of the third network device and the first port of the second network device includes circuitry for restoring power to the PD with power from the second PSE device.