Bidirectional inline power port

• US 7,363,525 B2
• Filed: 10/07/2004
• Issued: 04/22/2008
• 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: Schindler, Frederick R., Biederman, Daniel, Coley, Kenneth
• Primary Examiner(s): PERVEEN, REHANA
• Assistant Examiner(s): Sugent; James F.
• Application Number:
  US10/961,864
• Publication Number:
  US 20060089230A1
• Time in Patent Office: 1,293 Days
• Field of Search: 713300-340
• US Class Current: 713/340
• 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 method and apparatus for bidirectional provision of inline power over data telecommunications cabling permits power to be received at a local powered device (PD) from remote power sourcing equipment (PSE) via at least one conductor at a first time and power to be provided by the local device to the remote device or another device at a second different time.

Claims

1. A data telecommunications network, comprising:

a first device having a first port configured as power sourcing equipment (PSE);

a second device having a second port coupled to said first port, and a third port, the second port configured as a powered device (PD) and the third port configured as PSE, the second and the third port coupled within the second device to communicate data;

a third device having a fourth port coupled to said third port, and a fifth port, the fourth port configured at a first time as a PD and the fifth port configured at the first time with inline power turned off, the fourth port and the fifth port coupled within the third device to communicate data;

a fourth device having a sixth port coupled to said fifth port, and a seventh port, the sixth port configured at the first time with inline power turned off, the sixth port and the seventh port coupled within the fourth device to communicate data; and

circuitry for detecting a loss of power at a second time delivered from said third port to said fourth port, said fourth port adapted to turn off inline power responsive to said circuitry, said fifth port adapted to be configured as a PD responsive to said circuitry, and said sixth port adapted to turn on inline power and configure itself as PSE in response to said fifth port becoming configured as a PD.

2. The data telecommunications network of claim 1 wherein the second device, third device, and fourth device are respectively coupled to the first port, third port, and fifth port via a multi-conductor cable.

3. The data telecommunications network of claim 2 wherein the multi-conductor cable is an Ethernet cable.

4. The data telecommunications network of claim 1 wherein at least one of the first device, second device, third device, and fourth device are selected from the group consisting of portable computing device, telecommunications device, and rechargeable power store.

5. The data telecommunications network of claim 4 wherein the first device, second device, third device, and fourth device include a rechargeable power store and a chargeable device and wherein the rechargeable power store is charged when the chargeable device has surplus power.

6. The data telecommunications network of claim 5 wherein the rechargeable power store provides power to the chargeable device when the chargeable device requires power.

7. A method of operation for a data telecommunications network having a first device having a first port configured as power sourcing equipment (PSE), a second device having a second port coupled to said first port, and a third port, the second port configured as a powered device (PD) and the third port configured as PSE, the second and the third port coupled within the second device to communicate data, a third device having a fourth port coupled to said third port, and a fifth port, the fourth port configured at a first time as a PD and the fifth port configured at the first time with inline power turned off, the fourth port and the fifth port coupled within the third device to communicate data, and a fourth device having a sixth port coupled to said fifth port, and a seventh port, the sixth port configured at the first time with inline power turned off, and the sixth port and the seventh port coupled within the fourth device to communicate data, said method comprising:

detecting a loss of power at a second time delivered from the third port to the fourth port;

turning off inline power at the fourth port in response to said detecting;

configuring the fifth port as a PD in response to said detecting;

turning on inline power at the sixth port and configuring the sixth port as PSE in response to the fifth port becoming configured as a PD.

8. The method of claim 7 wherein the second device, third device, and fourth device are respectively coupled to the first port, third port, and fifth port via a multi-conductor cable.

9. The method of claim 8 wherein the multi-conductor cable is an Ethernet cable.

10. The method of claim 7 wherein at least one of the first device, second device, third device, and fourth device are selected from the group consisting of portable computing device, telecommunications device, and rechargeable power store.

11. The method of claim 10 wherein the first device, second device, third device, and fourth device include a rechargeable power store and a chargeable device and wherein the rechargeable power store is charged when the chargeable device has surplus power.

12. The method of claim 11 wherein the rechargeable power store provides power to the chargeable device when the chargeable device requires power.