# US 2014/0195831 A1 · ADVANCED PoE POWER CONTROL

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- Number: US 2014/0195831 A1
- Document ID: US20140195831A1
- Status: Published application
- Kind: A1
- Application number: 13/738,364
- Filed: 2013-01-10
- Published: 2014-07-10
- Earliest claimed: 2013-01-10
- Assignees: Dell Products L.P.
- Applicants: Dell Products L.P.
- Inventors: Rabah S. Hamdi; Bradley J. Booth
- Web page: https://patentgrep.com/patent/US20140195831A1

## CPC

- G06F 1/3287: by switching off individual functional units in the computer system
- 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}
- G06F 1/3215: Monitoring of peripheral devices
- G06F 1/325: {Power saving in peripheral device}
- G06F 1/3296: by lowering the supply or operating voltage
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- Y02D 30/00: Reducing energy consumption in communication networks
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A power sourcing equipment (PSE) device including a power over Ethernet (PoE) interface. A processor is coupled to the PoE interface. A memory is coupled to the processor and includes instruction that, when executed by the processor, cause the processor to perform a number of functions. The processor may supply power at a first power level to a PD that is coupled to the PoE interface. The processor may then determine an actual power consumption of the PD. The processor may then send a first Link Layer Discovery Protocol (LLDP) packet to the PD over the PoE interface that includes first proposed power level information that is based on the actual power consumption of the PD. Then processor may then supply power to the PD at a second power level that is different from the first power level.

## Claims

### Claim 1

A power sourcing equipment (PSE) device, comprising:
a power over Ethernet (PoE) interface;
a processor coupled to the PoE interface;
a memory coupled to the processor and including instruction that, when executed by the processor, cause the processor to:
supply power at a first power level to a PD that is coupled to the PoE interface;
determine an actual power consumption of the PD;
send a first Link Layer Discovery Protocol (LLDP) packet to the PD over the PoE interface that includes first proposed power level information that is based on the actual power consumption of the PD; and
supply power to the PD at a second power level that is different from the first power level.

### Claim 2 (depends on 1)

The PSE device of claim 1, wherein the memory includes instruction that, when executed by the processor, cause the processor to:
classify the PD, wherein the first power level is supplied to the PD based on the classification of the PD.

### Claim 3 (depends on 1)

The PSE device of claim 1, wherein the memory includes instruction that, when executed by the processor, cause the processor to:
receive a second LLDP packet from the PD through the PoE interface, wherein the second LLDP packet includes a power control event Time-Length-Value (TLV) that indicates a power state of the PD, and wherein the power is supplied to the PD at the second power level based on the power state of the PD.

### Claim 4 (depends on 3)

The PSE device of claim 3, wherein the power control event TLV includes one of a normal power state, a standby power state, and a sleep power state.

### Claim 5 (depends on 1)

The PSE device of claim 1, wherein the memory includes instruction that, when executed by the processor, cause the processor to:
receive a second LLDP packet from the PD through the PoE interface subsequent to sending the first LLDP packet, wherein the second LLDP packet includes first maximum power information for the PD and second proposed power level information that is associated with the second power level, and wherein the power is supplied to the PD at the second power level in response to receiving the second LLDP packet.

### Claim 6 (depends on 1)

The PSE device of claim 1, wherein the first proposed power level information is associated with the second power level.

### Claim 7 (depends on 6)

The PSE device of claim 6, wherein the memory includes instruction that, when executed by the processor, cause the processor to:
receive a third LLDP packet from the PD through the PoE interface subsequent to receiving the second LLDP packet, wherein the third LLDP packet includes second maximum power information for the PD and third proposed power level that is associated with a third power level that is different from the second power level, and wherein power is supplied to the PD at a third power level in response to receiving the third LLDP.

### Claim 8

A power over Ethernet (PoE) system, comprising:
a plurality of powered devices (PDs);
a power sourcing equipment (PSE) device coupled to each of the plurality of PDs through a respective Ethernet cable, wherein the PSE device is operable to:
supply power to each of the plurality of PDs at a respective static power level;
determine an actual power consumption of each of the plurality of PDs;
send a first Link Layer Discovery Protocol (LLDP) packet that includes first proposed power level information to a first PD of the plurality of PDs, wherein the LLDP packet is sent in response to the actual power consumption of the first PD being different from the respective static power level of the first PD; and
supply power to the first PD at a first power level that is different from the respective static power level of the first PD.

### Claim 9 (depends on 8)

The PoE system of claim 8, wherein the PSE device is operable to:
classify each of the plurality of PDs, wherein the respective power level of each of the plurality of PDs is supplied based on the classification of that PD.

### Claim 10 (depends on 8)

The PoE system of claim 8, wherein the PSE device is operable to:
receive a second LLDP packet from the first PD, wherein the second LLDP packet includes a power control event Time-Length-Value (TLV) that indicates a power state of the first PD, and wherein the power is supplied to the PD at the first power level based on the power state of the first PD.

### Claim 11 (depends on 10)

The PoE system of claim 10, wherein the power control event TLV includes one of a normal power state, a standby power state, and a sleep power state.

### Claim 12 (depends on 8)

The PoE system of claim 8, wherein the PSE device is operable to:
receive a second LLDP packet from the first PD subsequent to sending the first LLDP packet, wherein the second LLDP packet includes first maximum power information for the first PD and second proposed power level information that is associated with the first power level, and wherein the power is supplied to the first PD at the first power level in response to receiving the second LLDP packet.

### Claim 13 (depends on 8)

The PoE system of claim 8, wherein the first proposed power level information is associated with the first power level.

### Claim 14 (depends on 13)

The PoE system of claim 13, wherein the memory includes instruction that, when executed by the processor, cause the processor to:
receive a third LLDP packet from the first PD subsequent to receiving the second LLDP packet, wherein the third LLDP packet includes second maximum power information for the PD and third proposed power level that is associated with a second power level that is different from the first power level, and wherein power is supplied to the PD at a second power level in response to receiving the third LLDP.

### Claim 15

A method for providing power, comprising:
supplying power at a first power level from a power sourcing equipment (PSE) device to a powered device (PD);
determining an actual power consumption of the PD by the PSE device;
sending a first Link Layer Discovery Protocol (LLDP) packet from the PSE device to the PD that includes first proposed power level information that is based on the actual power consumption of the PD; and
supplying power from the PSE device to the PD at a second power level that is different from the first power level.

### Claim 16 (depends on 15)

The method of claim 15, further comprising:
classifying the PD, wherein the first power level is supplied to the PD based on the classification of the PD.

### Claim 17 (depends on 15)

The method of claim 15, further comprising:
receiving a second LLDP packet from the PD, wherein the second LLDP packet includes a power control event Time-Length-Value (TLV) that indicates a power state of the PD, and wherein the power is supplied to the PD at the first power level based on the power state of the PD.

### Claim 18 (depends on 15)

The method of claim 15, further comprising:
receiving a second LLDP packet from the PD subsequent to sending the first LLDP packet, wherein the second LLDP packet includes first maximum power information for the PD and second proposed power level information that is associated with the second power level, and wherein the power is supplied to the PD at the second power level in response to receiving the second LLDP packet.

### Claim 19 (depends on 15)

The method of claim 15, wherein the first proposed power level information is associated with the second power level.

### Claim 20 (depends on 19)

The method of claim 19, further comprising:
receiving a third LLDP packet from the PD subsequent to receiving the second LLDP packet, wherein the third LLDP packet includes second maximum power information for the PD and third proposed power level that is associated with a third power level that is different from the second power level, and wherein power is supplied to the PD at a third power level in response to receiving the third LLDP.