Inline power control

• US 7,613,933 B1
• Filed: 07/11/2003
• Issued: 11/03/2009
• Est. Priority Date: 07/11/2003
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Provost, Jeffrey D.
• Primary Examiner(s): Lee; Thomas
• Assistant Examiner(s): Brown; Michael J
• Application Number:
  US10/618,211
• Time in Patent Office: 2,307 Days
• Field of Search: 713/300, 713/320, 713/321, 713/340, 455/423, 455/424
• 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

Abstract

A physical layer for an inline power device of a network power system. The network power system includes inline power devices such as power source equipment and a plurality of powered devices and further includes a plurality of corresponding transmission media. The plurality of transmission media are connected to the corresponding power source equipment and powered devices through a power interface at each end of the transmission media. The multiple power interfaces of the power source equipment are often referred to as ports. For each port of the power source equipment and the plurality of powered devices, there exists a physical layer. The physical layer includes an inline power control signal source. The inline power control signal designates when to apply power to a port when there is no power applied to the port and when to remove power from the port when there is power applied to the port.

Claims

1. A power source equipment of a network power system, the power source equipment comprising:

at least one physical layer including;

an inline power control signal source originating from the physical layer, wherein the inline power control signal is configured to indicate when to apply power to a port when there is no power applied to the port and when to remove power from the port when there is power applied to the port; and

signal processing of the inline power control signal, wherein the signal processing is external to the at least one physical layer.

2. A power source equipment according to claim 1, wherein the physical layer comprises a physical coding sublayer and a physical medium attachment sublayer and is configured to serve as a bridge between a media-dependent interface of the port and a media-independent interface of the port.

3. A power source equipment according to claim 2, further comprising a media access control component and a station management component both connected to the media-independent interface.

4. A power source equipment according to claim 3, wherein the station management component provides management data input/output and a management data clock to the physical layer.

5. A power sourcing equipment according to claim 2, wherein the physical layer further comprises a physical medium dependent sublayer.

6. A power source equipment of a network power system, the power source equipment comprising:

at least one physical layer including;

an inline power control signal source originating from the physical layer, wherein the inline power control signal is configured to indicate when to apply power to a port when there is no power applied to the port and when to remove power from the port when there is power applied to the port; and

a signal processor configured to process the inline power control signal, wherein the signal processing is external to the at least one physical layer.

7. A power source equipment according to claim 6, wherein the physical layer comprises a physical coding sublayer and a physical medium attachment sublayer and is configured to serve as a bridge between a media-dependent interface of the port and a media-independent interface of the port.

8. A power source equipment according to claim 7, further comprising a media access control component and a station management component both connected to the media-independent interface.

9. A power source equipment according to claim 8, wherein the station management component provides management data input/output and a management data clock to the physical layer.

10. A power sourcing equipment according to claim 7, wherein the physical layer further comprises a physical medium dependent sublayer.

11. A network switch for a network power system, the switch comprising:

at least one physical layer including;

an inline power control signal source originating from the physical layer, wherein the inline power control signal is configured to indicate when to apply power to a port when there is no power applied to the port and when to remove power from the port when there is power applied to the port; and

signal processing of the inline power control signal, wherein the signal processing is external to the at least one physical layer.

12. A network switch according to claim 11, wherein the physical layer comprises a physical coding sublayer and a physical medium attachment sublayer and is configured to serve as a bridge between a media-dependent interface of the port and a media-independent interface of the port.

13. A network switch according to claim 12, further comprising a media access control component and a station management component both connected to the media-independent interface.

14. A network switch according to claim 13, wherein the station management component provides management data input/output and a management data clock to the physical layer.

15. A network switch according to claim 12, wherein the physical layer further comprises a physical medium dependent sublayer.

16. A system comprising:

one or more inline power devices;

one or more powered devices coupled to an inline power device, each of the one or more inline power devices and each of the one or more powered devices having at least one port, each port having a physical layer, the physical layer including an inline power control signal source wherein an inline power control signal source originating from the physical layer controls application of power to the port, and further comprising;

a signal processor external to the physical layers to process the inline power control signal.

17. A system according to claim 16, wherein the physical layer of each port comprises a physical coding sublayer and a physical medium attachment sublayer and is configured to serve as a bridge between a media-dependent interface of the port and a media-independent interface of the port.

18. A system according to claim 17, further comprising for each port a media access control component and a station management component both connected to the media-independent interface of the port.

19. A system according to claim 18, wherein the station management component provides management data input/output and a management data clock to the physical layer.

20. A system according to claim 17, wherein the physical layer of each port further comprises a physical medium dependent sublayer.