Power and data redundancy in a single wiring closet

• US 8,386,832 B2
• Filed: 10/28/2010
• Issued: 02/26/2013
• 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: Karam, Roger A., Cafiero, Luca
• Primary Examiner(s): Baderman, Scott
• Assistant Examiner(s): BUTLER, SARAI E
• Application Number:
  US12/914,328
• Publication Number:
  US 20110047407A1
• Time in Patent Office: 852 Days
• Field of Search: 714/2, 714/3, 714/4.1, 714/4.11
• US Class Current: 714/4.11
• 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 first network device and a second network device configured as power sourcing equipment (PSE) devices and coupled together and to a third network device (such as a PD) via a Y device is provided by providing redundant signaling to/from each of the pair of network devices, and coupling a port of each of the network devices to the Y device and from there to a third port where a third network device such as a PD may be coupled. Because the Y device is essentially passive, communications paths between the PSE devices and the PD are provided for negotiating master/slave status and other status and related information among the respective network devices. Dynamic impedance matching is provided to handle situations where not all devices are plugged in and as a communications technique among the devices.

Claims

1. A method for providing redundancy for communications and/or inline power between a first network node and a second network node in a wired data telecommunications network, the method comprising:

directing, from the first network node, redundant network communications to and from a first network device and a second network device;

coupling a first port of a Y device to the second network node, the Y device having at least three ports with at least two pairs of conductors coupled across the at least three ports;

coupling a second port of the Y device to a first port of the first network device;

coupling a third port of the Y device to a first port of the second network device;

configuring the first network device as a master device to serve as the operative network device of the first network device and the second network device and route communications between the network node and the first port of the wired data telecommunications network;

configuring the second network device as a slave device;

monitoring, at the second network device, communications and/or inline power between the second network node and the first port of the first network device;

detecting a condition in the first network device in response to monitoring communications and/or inline power between the second network node and the first port of the first network device; and

reconfiguring the second network device as the master device and the first network device as the slave device in response to detecting the condition in the first network device.

2. The method of claim 1, further comprising dynamically adjusting a wired data telecommunications network impedance in at least one of the first and second network devices in response to measurements made at said first or second network devices.

3. The method of claim 1, further comprising measuring the wired data telecommunications network impedance in at least one of the first and second network devices with a time domain reflectometer.

4. The method of claim 1, further comprising sending a message to a network control point in response to detecting.

5. The method of claim 4, wherein said sending is performed using the wired data telecommunications network to send a message from the second network device through the network node.

6. The method of claim 4, wherein said sending is performed using a wireless telecommunications link from the second network device to a wireless node coupled to the wired data telecommunications network, and from the wireless node to the network control point.

7. The method of claim 1, wherein detecting the condition in the first network device comprises detecting a fault condition associated with the first network device.

8. The method of claim 1, wherein:

the Y device includes four pairs of conductors; and

two of the four pairs of conductors are each shorted to the first, second, and third ports of the Y device.

9. A redundant network device for providing redundancy for communications and/or inline power between a first network node and a second network node in a wired data telecommunications network, comprising:

a data communications device configured to direct, from the first network node, redundant network communications to and from a first network device and a second network device;

first conductors coupling a first port of a Y device to the second network node, the Y device having at least three ports with at least two pairs of conductors coupled across the at least three ports;

second conductors coupling a second port of the Y device to a first port of the first network device;

third conductors coupling a third port of the Y device to a first port of the second network device;

a processor internal to the first network device causing the first network device to initially act as master and thereby route communications from the router to the first port of the first network device;

a processor of the first network device operable to configuring the first network device as a master device to serve as the operative network device of the first network device and the second network device and route communications between the network node and the first port of the wired data telecommunications network;

a processor of the first network device operable to configuring the second network device as a slave device;

a monitor associated with the second network device configured to monitor communications and/or inline power between the second network node and the first port of the first network device;

a detector configured to detect a condition in the first network device in response to monitoring communications and/or inline power between the second network node and the first port of the first network device; and

circuitry configured to reconfigure the second network device as the master device and the first network device as the slave device in response to detecting the condition in the first network device.

10. The device of claim 9, further comprising a dynamic impedance terminator for dynamically adjusting wired data telecommunications network impedance at the second device in response to measurements made at the second device.

11. The device of claim 9, further comprising:

a communicator for sending a message to a network control point in response to said detector.

12. The device of claim 11, wherein said communicator utilizes the wired data telecommunications network to send a message from the second network device through the first network node.

13. The device of claim 11, wherein said communicator utilizes a wireless telecommunications link to a wireless node coupled to the wired data telecommunications network, and from the wireless node to the network control point.

14. The device of claim 11, wherein the detector is configured to detect a fault condition associated with the first network device.

15. The device of claim 11, wherein:

the Y device includes four pairs of conductors; and

two of the four pairs of conductors are each shorted to the first, second, and third ports of the Y device.

16. A system for providing redundancy for communications and/or inline power between a first network node and a second network node in a wired data telecommunications network, the system comprising:

circuitry for directing, from the first network node, redundant network communications to and from a first network device and a second network device;

circuitry for coupling a first port of a Y device to the second network node, the Y device having at least three ports with at least two pairs of conductors coupled across the at least three ports;

circuitry for coupling a second port of the Y device to a first port of the first network device;

circuitry for coupling a third port of the Y device to a first port of the second network device;

circuitry for configuring the first network device as a master device to serve as the operative network device of the first network device and the second network device and route communications between the network node and the first port of the wired data telecommunications network;

circuitry for configuring the second network device as a slave device;

circuitry for monitoring, at the second network device, communications and/or inline power between the second network node and the first port of the first network device;

circuitry for detecting a condition in the first network device in response to monitoring communications and/or inline power between the second network node and the first port of the first network device; and

circuitry for reconfiguring the second network device as the master device and the first network device as the slave device in response to detecting the condition in the first network device.

17. The system of claim 16, further comprising circuitry for dynamically adjusting wired data telecommunications network impedance at the first network device in response to measurements made at the first network device.

18. The system of claim 16, further comprising:

circuitry for sending a message to a network control point in response to said circuitry for detecting.

19. The system of claim 18, wherein said circuitry for sending utilizes the wired data telecommunications network to send a message from the second network device through the network node.