Automatic system for power and data redundancy in a wired data telecommunications network

• US 7,823,026 B2
• Filed: 10/07/2004
• Issued: 10/26/2010
• 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:
  US10/961,865
• Publication Number:
  US 20060092826A1
• Time in Patent Office: 2,210 Days
• Field of Search: 714/4, 714/43
• US Class Current: 714/43
• 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 41/0604 using filtering, e.g. reduction of information by using priority, element types, position or time

Abstract

Redundancy of data and/or Inline Power in a wired data telecommunications network from a pair of power sourcing equipment (PSE) devices via an automatic selection device is provided by providing redundant signaling to/from each of the pair of PSE devices, and coupling a port of one PSE device and a redundant port of the second PSE device to respective first and second interfaces of a port of the selection device. The selection device initially selects one of the two PSE devices and communicates data and/or Inline Power to a third interface of the selection device. A powered device (PD) coupled to that third interface communicates data and/or Inline Power with the selected one of the first and second PSE device through the selection device. Upon detection of a condition, such as a failure condition, the selection device may select the other of the two interfaces.

Claims

1. A method for providing redundancy to a port of 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 data telecommunications device;

coupling a second interface of the first port of the redundancy selection device to a first port of a second data telecommunications device;

except for the portions of signals unique to the first data telecommunications device and the second data telecommunications device, providing identical data signals to the first port of the first data telecommunications device and to the first port of the second data telecommunications device at substantially the same time;

coupling data and/or power received over the first interface of the first port of the redundancy selection device to provide data and/or power to a third interface of the first port of the redundancy selection device;

detecting a failure in the flow of data and/or power from the first data telecommunications device; and

activating the redundancy selection device in response to said detecting to subsequently use data and/or power received over the second interface of the first port of the redundancy selection device to provide data and/or power from the second data telecommunications device to the third interface.

2. The method of claim 1, wherein:

said detecting detects a failure in the flow of data and/or power between the first interface of the first port of the redundancy selection device and the first port of the first data telecommunications device.

3. The method of claim 2, further comprising:

powering the redundancy selection device with inline power obtained from at least one of the first data telecommunications device and second data telecommunications device.

4. The method of claim 3, further comprising:

notifying a network control point of said detecting.

5. The method of claim 4, wherein said notifying is performed using the wired data telecommunications network to send a message from the redundancy selection device through at least one of the first data telecommunications device and the second data telecommunications device.

6. The method of claim 4, 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.

7. The method of claim 1, wherein:

providing identical data signals to the first port of the first data telecommunications device and to the first port of the second data telecommunications device comprises sending data signals to each of the first port of the first data telecommunications device and the first port of the second data telecommunications device, the data signals sent to the first port of the second data telecommunications device configured as duplicates of the data signals sent to the first port of the first data telecommunications device;

coupling data and/or power received over the first interface of the first port of the redundancy selection device to provide data and/or power to a third interface of the first port of the redundancy selection device further comprises, prior to coupling data and/or power, receiving data signals and/or power from the first port of the first data telecommunications device via the first interface of the first port of the redundancy selection device; and

activating the redundancy selection device in response to said detecting to subsequently use data and/or power received over the second interface of the first port of the redundancy selection device to provide data and/or power to the third interface comprises activating the redundancy selection device, in response to said detecting, to receive the redundant data signals and/or power from the first port of the second data telecommunications device via the second interface of the first port of the redundancy selection device to provide data and/or power to the third interface.

8. The method of claim 7, wherein activating the redundancy selection device in response to said detecting to subsequently use data and/or power received over the second interface of the first port of the redundancy selection device to provide data and/or power to the third interface further comprises activating a switch of the redundancy selection device, in response to detecting, to deselect the first interface of the first port of the redundancy selection device and the first port of a first data telecommunications device and to select the second interface of the first port of the redundancy selection device to receive the redundant data signals and/or power from the first port of the second data telecommunications device via the second interface of the first port of the redundancy selection device and to provide the redundant data signals and/or power to the third interface.

9. The method of claim 1, wherein:

coupling the first interface of the first port of the redundancy selection device to the first port of the first data telecommunications device comprises coupling the first interface of the first port of the redundancy selection device to a first port of a first power sourcing equipment device; and

coupling the second interface of the first port of the redundancy selection device to the first port of the second data telecommunications device comprises coupling the second interface of the first port of the redundancy selection device to a first port of a second power sourcing equipment device.

10. The method of claim 9, comprising coupling the third interface of the first port of the redundancy selection device to a powered device to provide data and power to the powered device.

11. The method of claim 1, wherein activating the redundancy selection device comprises activating a set of passive electronic components associated with the redundancy selection device, the set of passive electronic components having a first switch associated with the first port of the redundancy selection device and a second switch associated with the second port of the redundancy selection device the first switch having an operating state that opposes the operating state of the second switch.

12. The method of claim 1, wherein:

the first data telecommunications device is configured as a first power sourcing equipment (PSE) device;

the second data telecommunications device is configured as a second PSE device;

wherein detecting a failure in the flow of data and/or power from the first data telecommunications 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 use data and/or power received over the second interface of the first port of the redundancy selection device to provide data and/or power from the second data telecommunications device to the third interface includes restoring power to the PD with power from the second PSE device.

13. A redundancy selection apparatus for providing redundancy to a port of a wired data telecommunications network, the apparatus comprising:

means for coupling a first interface of a first port of the apparatus to a first port of a first data telecommunications device;

means for coupling a second interface of the first port of the apparatus to a first port of a second data telecommunications device;

means for coupling data and/or power received over the first interface of the first port of the apparatus to provide data and/or power to a third interface of the first port of the apparatus;

means for providing identical data signals, excepting portions of signals unique to the first data telecommunications device and the second data telecommunications device, to the first port of the first data telecommunications device and to the first port of the second data telecommunications device at substantially the same time;

means for detecting a failure in the flow of data and/or power from the first data telecommunications device; and

means for activating the apparatus in response to a failure detection by said means for detecting to subsequently use data and/or power received over the second interface of the first port of the apparatus to provide data and/or power from the second data telecommunications device to the third interface.

14. The apparatus of claim 13, wherein:

said failure detection means operates to detect a failure in the flow of data and/or power between the first interface of the first port of the redundancy selection device and the first port of the first data telecommunications device.

15. The apparatus of claim 14, further comprising

means for powering the apparatus with inline power obtained from at least one of the first data telecommunications device and second data telecommunications device.

16. The apparatus of claim 15, further comprising:

means for notifying a network control point of a failure detection by said means for detecting.

17. The apparatus of claim 16, wherein said means for notifying operates by using the wired data telecommunications network to send a message from the apparatus through at least one of the first data telecommunications device and the second data telecommunications device.

18. The apparatus of claim 16, wherein said means for notifying operates by using a wireless telecommunications link from the apparatus to a wireless node coupled to the wired data telecommunications network.

19. The apparatus of claim 13, wherein:

the first data telecommunications device is configured as a first power sourcing equipment (PSE) device;

the second data telecommunications device is configured as a second PSE device;

means for detecting a failure in the flow of data and/or power from the first data telecommunications 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

means for activating the apparatus in response to a failure detection by said means for detecting to subsequently use data and/or power received over the second interface of the first port of the apparatus to provide data and/or power from the second data telecommunications device to the third interface includes means for restoring power to the PD with power from the second PSE device.

20. A system for providing redundancy for a port of a wired data telecommunications network, the system comprising:

a redundancy selection circuit having at least a first port, said port having a first interface for communicating with a first telecommunications device and a second interface for communicating with a second telecommunications device, and a third interface;

a controller operable to;

set an initial mode of operation for the system wherein the system couples signals to and from the third interface of the redundancy selection device to the first interface of the first port of the redundancy selection device;

detect a failure in Inline Power and/or data flowing to or from the first data telecommunications device through the first interface;

responsive to said detection of a failure, reconfigure to couple signals to and from the third interface of the redundancy selection device to the second interface of the first port of the redundancy selection device to provide Inline Power and/or data from the second data telecommunications device to the third interface; and

a network device coupled to the redundancy selection circuit via a first port of the first telecommunications device and via a first port of the second network telecommunications device and configurable to, except for the portions of signals unique to the first data telecommunications device and the second data telecommunications device, provide identical data signals to the redundancy selection circuit via the first port of the first data telecommunications device and via the first port of the second data telecommunications device at substantially the same time.

21. The system of claim 20, wherein:

the first data telecommunications device is configured as a first power sourcing equipment (PSE) device;

the second data telecommunications device is configured as a second PSE device;

when detecting a failure in Inline Power and/or data flowing to or from the first data telecommunications device through the first interface, the controller Is configured to detect 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

when reconfiguring to couple signals to and from the third interface of the redundancy selection device to the second interface of the first port of the redundancy selection device to provide Inline Power and/or data from the second data telecommunications device to the third interface, the controller Is configured to restore power to the PD with power from the second PSE device.

22. A method for operating a selector device coupled over a first link to a first redundant network device and over a second link to a second redundant network device, the method comprising:

causing the first redundant network device to carry out a self-diagnosis test;

causing the second redundant network device to carry out a self-diagnosis test;

checking the links between the first redundant network device and the selector device;

checking the links between the second redundant network device and the selector device;

determining if the first redundant network device or its links to the selector device have a failure condition and/or if the second redundant network device or its links to the selector device have a failure condition,

responsive to said determining, notifying a network control center if a failure condition is detected; and

choosing one of the first redundant network device and the second redundant network device to be active based upon it not having a failure condition associated with it or its links to the selector device, and, in the absence of any failure condition, choosing one of the first redundant network device and the second network device to be active based upon a predetermined default setting.

23. A system for operating a selector device coupled over a first link to a first redundant network device and over a second link to a second redundant network device,

the system comprising:

means for causing the first redundant network device to carry out a self-diagnosis test;

means for causing the second redundant network device to carry out a self-diagnosis test;

means for checking the links between the first redundant network device and the selector device;

means for checking the links between the second redundant network device and the selector device;

means for determining if the first redundant network device or its links to the selector device have a failure condition and/or if the second redundant network device or its links to the selector device have a failure condition;

responsive to said means for determining, means for notifying a network control center if a failure condition is detected; and

means for choosing one of the first redundant network device and the second redundant network device to be active based upon it not having a failure condition associated with it or its links to the selector device, and, in the absence of any failure condition, choosing one of the first redundant network device and the second network device to be active based upon a predetermined default setting.