System and method for safely controlling, and receiving status of, power over ethernet

• US 7,187,268 B1
• Filed: 09/29/2004
• Issued: 03/06/2007
• Est. Priority Date: 10/02/2003
• Status: Expired due to Fees

• Current Assignee: RPX Corporation
• Original Assignee: Vernier Networks, Inc.
• Inventors: Armstrong, Elton, Dimick, Brent, Klingensmith, James B
• Primary Examiner(s): Swarthout, Brent A.
• Application Number:
  US10/953,408
• Time in Patent Office: 888 Days
• Field of Search: 340/825.01, 340/538, 340/310.11, 340/310.16, 340/310.18, 361/90, 713/300, 370/254, 370/257, 370/395.1, 370/395.53, 370/395.52, 370/395.5, 370/200, 370/445, 370/217, 370/238, 370/404, 370/446, 370/524, 379/399.01, 379/2, 379/5, 379/412, 379/413, 700/297, 700/295, 375/211, 375/257, 375/259, 710/300, 439/713, 455/73
• US Class Current: 340/12.32
• CPC Class Codes: G05B 2219/25132 Superposition data signals on power lines for actuators
• CPC Class Codes: G05B 2219/25174 Ethernet
• CPC Class Codes: H04L 12/10 Current supply arrangements

Abstract

A system and method electrically isolates configuration and status information about power provided over Ethernet cabling.

Claims

1. A method of communicating information regarding power that flows over an Ethernet cable, the method comprising:

receiving configuration information for the power, the configuration information comprising an indication of a polarity of the power to be provided over the Ethernet cable;

electrically isolating the configuration information;

providing the electrically isolated configuration information;

receiving the power;

responsive to the electrically isolated configuration information, reversing the polarity of at least a portion of the power provided; and

providing via an Ethernet cable at least a portion of the power having the reversed polarity.

2. The method of claim 1 additionally comprising:

detecting status related to at least one selected from the power received and the power provided;

providing status information responsive to the status detected; and

electrically isolating the status information.

3. The method of claim 2, wherein:

the status related to said power received comprises a voltage of at least a portion of said power received, said at least the portion having been isolated from said power received; and

the status related to said power provided comprises a voltage of at least a portion of said power provided, said at least the portion having been isolated from said power received.

4. The method of claim 3, wherein the at least the portion has undergone at least one change in voltage.

5. The method of claim 1, wherein the electrically isolating step comprises opto-isolating the configuration information.

6. The method of claim 1, wherein the providing step comprises providing at least a portion of the reversed polarity power to equipment that will process Ethernet network signals received over the Ethernet cable.

7. A system for communicating information regarding power that flows over an Ethernet cable, the system comprising:

an isolator having an input coupled for receiving configuration information for the power, the configuration information comprising an indication of a polarity of the power to be provided over the Ethernet cable, the isolator for electrically isolating the configuration information and providing the electrically isolated configuration information at an output;

a power polarity controller having a power input for receiving the power and a control input coupled to the isolator output for receiving the electrically isolated configuration information, the isolator for, responsive to the electrically isolated configuration information, reversing the polarity of at least a portion of the power received and providing at a power output at least a portion of the power having the reversed polarity; and

an Ethernet connector having at least one lead coupled to the power polarity controller power output.

8. The system of claim 7:

additionally comprising a power sense controller having at least one input coupled to at least one selected from the power polarity controller power output and the power polarity controller power input for receiving status related to the power, the power sense controller for providing at an output, the status information responsive to the status detected; and

wherein the isolator additionally comprises a second input coupled to the power sense controller for receiving the status information, the isolator for electrically isolating the status information and providing it at a second output.

9. The system of claim 8, wherein:

the status related to said power received comprises a voltage of at least a portion of said power received, said at least the portion having been isolated from said power received; and

the status related to said power provided comprises a voltage of at least a portion of said power provided, said at least the portion having been isolated from said power received.

10. The system of claim 9, wherein the at least the portion of the power provided for which status information is provided at the power sense controller output has undergone at least one change in voltage.

11. The system of claim 7, wherein the isolator comprises an opto-isolator.

12. The system of claim 7, wherein the power polarity Ethernet connector is coupled to a power input of equipment that will process Ethernet network signals received over the Ethernet cable.