Inline power policing

• US 7,698,580 B2
• Filed: 08/25/2006
• Issued: 04/13/2010
• Est. Priority Date: 08/25/2006
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Tiyyagura, Asok, Schindler, Frederick Roland
• Primary Examiner(s): Cao; Chun
• Assistant Examiner(s): Stoynov; Stefan
• Application Number:
  US11/509,947
• Publication Number:
  US 20080052546A1
• Time in Patent Office: 1,327 Days
• Field of Search: 713/300, 713/324, 700/297, 323/371
• US Class Current: 713/300
• CPC Class Codes: G06F 1/266 Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04L 12/40045 Details regarding the feeding of energy to the node from the bus

Abstract

In a wired data telecommunication network power sourcing equipment coupled to a powered device performs policing of power drawn by the powered device. In one embodiment, a method includes monitoring power drawn by the powered devices at power sourcing equipment, each powered device having a policing limit associated therewith. If power drawn by one of the powered devices exceeds the policing limit, it is determined if a power budget of the power sourcing equipment continues to provide power to the powered devices. If the power budget has been exceeded, action is initiated at the power sourcing equipment. The action may include sending or logging a warning, requesting the powered device to reduce its power requirement or removing power from one of the powered devices. An apparatus for policing inline power is also disclosed.

Claims

1. A method for policing inline power, the method comprising:

monitoring power drawn by one or more powered devices at power sourcing equipment, each of the one or more powered devices having a policing limit associated therewith;

if power drawn by one of the powered devices exceeds the policing limit for the powered device;

determining if a power budget of the power sourcing equipment has been exceeded;

if said power budget has not been exceeded, continuing to provide power to the one or more powered devices; and

if said power budget has been exceeded, initiating an action at the power sourcing equipment;

wherein initiating an action comprises requesting at least one of the powered devices to operate in a low power mode and removing power from one of the powered devices if the powered device requested to operate in a low power mode does not switch to said low power mode.

2. The method of claim 1 where initiating an action comprises removing power from the powered device exceeding the policing limit.

3. The method of claim 1 further comprising changing said policing limit associated with the powered device upon receiving notification that the powered device has switched to said low power mode.

4. The method of claim 1 wherein each of the one or more powered devices has a priority level assigned thereto.

5. The method of claim 4 wherein initiating an action comprises, if the powered device exceeding the policing limit has a high priority level, removing power from another one of the powered devices that has a lower priority level.

6. The method of claim 1 wherein said power budget is based on a summation of peak power demand of each of the one or more powered devices.

7. The method of claim 1 wherein said power budget is based on a summation of an average power demand of each of the one or more powered devices.

8. The method of claim 1 further comprising calculating a statistical value of power demand of the one or more powered devices and utilizing said statistical value to define said power budget.

9. The method of claim 1 wherein monitoring power drawn by the one or more powered devices comprises monitoring a current at periodic intervals and wherein one of the powered devices exceeds the policing limit only if the policing limit is exceeded for a defined period of time.

10. Apparatus for policing inline power, the apparatus comprising:

power sourcing equipment operable to provide inline power to one or more powered devices, each of the powered devices having a policing limit associated therewith;

a monitor configured to monitor power drawn by the one or more powered devices;

a controller configured to detect one or more of the powered devices exceeding the policing limit and determine if a power budget of the power sourcing equipment has been exceeded, if said power budget has not been exceeded, continue to provide power to the one or more powered devices, and if said power budget has been exceeded, initiate an action at the power sourcing equipment; and

a memory for storing said policing limits and said power budget;

wherein said action comprises requesting at least one of the powered devices to operate in a low power mode and the controller is configured to remove power from the powered device requested to operate in a low power mode, if the powered device does not switch to said low power mode.

11. The apparatus of claim 10 wherein said action comprises removing power from the powered device exceeding the policing limit.

12. The apparatus of claim 10 wherein the controller is configured to change the policing limit associated with the powered device upon receiving notification that the powered device has switched to said low power mode.

13. The apparatus of claim 10 wherein each of the one or more powered devices has a priority level assigned thereto.

14. The apparatus of claim 13 wherein said action comprises, if the powered device exceeding the policing limit has a high priority level, removing power from another one of the powered devices that has a lower priority level.

15. The apparatus of claim 10 wherein said power budget is based on a summation of peak power demand of each of the one or more powered devices.

16. The apparatus of claim 10 wherein said power budget is based on a summation of an average power demand of each of the one or more powered devices.

17. The apparatus of claim 10 wherein the controller is configured to calculate a statistical average of power demand of the one or more powered devices and utilize said statistical average to define said power budget.

18. The apparatus of claim 10 wherein the monitor is configured to monitor a current at periodic intervals and wherein one of the powered devices exceeds the policing limit only if the policing limit is exceeded for a defined period of time.

19. The apparatus of claim 10 wherein the monitor comprises an analog to digital converter.

20. The apparatus of claim 10 wherein the controller is further configured to log a warning message upon detection of one of the powered devices exceeding the policing limit.

21. The apparatus of claim 10 wherein said action comprises sending a warning message to the powered device exceeding said policing limit.

22. The apparatus of claim 10 wherein the controller is configured to receive a request from one of the powered devices to modify the policing limit associated therewith for a limited duration of time.

23. The apparatus of claim 10 wherein the controller is operable to receive the policing limit from each of the one or more powered devices following detection and classification of the powered device.

24. The apparatus of claim 10 wherein the controller is operable to assign a priority level to the one or more powered devices.

25. The apparatus of claim 10 wherein the controller is configured to calculate an average power demand for each of the one or more powered devices and wherein said average power demands are utilized in calculating said power budget.

26. The apparatus of claim 10 wherein the power sourcing equipment is configured to operate as a backup power source for one or more powered devices and is operable to receive power demand information from the one or more powered devices.