# US 2018/0323981 A1 · Power over Ethernet (PoE) Power Supplying Method and Apparatus

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- Number: US 2018/0323981 A1
- Document ID: US20180323981A1
- Status: Published application
- Kind: A1
- Application number: 16/039,310
- Filed: 2018-07-18
- Published: 2018-11-08
- Earliest claimed: 2015-03-10
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co.,Ltd.
- Inventors: Yan Zhuang; Shiyong Fu; Hua Chen; Xiuju Liang; Jincan Cao; Rui Hua
- Web page: https://patentgrep.com/patent/US20180323981A1

## CPC

- H04L 12/10: Current supply arrangements
- G06F 1/26: Power supply means, e.g. regulation thereof (for memories G11C)
- H04L 12/40045: {Details regarding the feeding of energy to the node from the bus}
- Y02D 30/00: Reducing energy consumption in communication networks
- Y02D 30/50: in wire-line communication networks, e.g. low power modes or reduced link rate
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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 over Ethernet (PoE) power supplying method where power sourcing equipment (PSE) and a powered device exchange link layer discovery protocol data units (LLDPDUs). Each of the LLDPDUs includes two power values. Each of the power values indicates requested or allocated power for one of two sets of cable pairs of the Ethernet twisted pair connecting the PSE and the powered device. Accordingly, the supplied powers to the powered device at sets of cable pairs are independent from each other.

## Claims

### Claim 1

A power over Ethernet method, comprising:
receiving, by power sourcing equipment (PSE), a first Link Layer Discovery Protocol data unit (LLDPDU) from a powered device (PD), wherein the PD is connected to the PSE using an Ethernet twisted pair cable, and the Ethernet twisted pair cable comprises a first set of cable pairs connected to the PD and a second set of cable pairs connected to the PD, and wherein the first LLDPDU carries a first requested power value for the first set of cable pairs and a second requested power value for the second set of cable pairs; and
sending, by the PSE, a second LLDPDU to the PD, wherein the second LLDPDU carries a first allocated power value allocated by the PSE for the first set of cable pairs and a second allocated power value allocated by the PSE for the second set of cable pairs.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising:
supplying, by the PSE, a first power to the PD according to the first allocated power value using the first set of cable pairs; and
supplying, by the PSE, a second power to the PD according to the second allocated power value using the second set of cable pairs.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising:
determining, by the PSE, the first allocated power value and the second allocated power value according to the first requested power value and the second requested power value carried in the first LLDPDU.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the first allocated power value is less than or equal to the first requested power value, and the second allocated power value is less than or equal to the second requested power value.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the first requested power value and the second requested power value are independent of each other.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the first allocated power value and the second allocated power value are independent of each other.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the first LLDPDU further carries a PD interface indication, and the PD interface indication indicates to the PSE that the PD comprises two PD interfaces.

### Claim 8

Power sourcing equipment (PSE), comprising:
an Ethernet connector for connecting to a powered device (PD) using an Ethernet twisted pair cable, wherein the Ethernet twisted pair cable comprises a first set of cable pairs and a second set of cable pairs;
a PSE chip for controlling power supply to the PD via the Ethernet connector;
a memory storing program instructions; and
a processor coupled to the memory and the PSE chip, and configured to execute the program instructions;
wherein, when executing the program instructions by the processor, the PSE is configured to:
receive a first link layer discovery protocol data unit (LLDPDU) from the PD, wherein the first LLDPDU carries a first requested power value for the first set of cable pairs and a second requested power value for the second set of cable pairs; and
send a second LLDPDU to the PD, wherein the second LLDPDU carries a first allocated power value allocated by the PSE for the first set of cable pairs and a second allocated power value allocated by the PSE for the second set of cable pairs.

### Claim 9 (depends on 8)

The PSE according to claim 8, wherein when executing the program instructions by the processor, the PSE is further configured to:
supply a first power to the PD according to the first allocated power value using the first set of cable pairs; and
supply a second power to the PD according to the second allocated power value using the second set of cable pairs.

### Claim 10 (depends on 8)

The PSE according to claim 8, wherein when executing the program instructions by the processor, the PSE is further configured to:
determine the first allocated power value and the second allocated power value according to the first requested power value and the second requested power value.

### Claim 11 (depends on 10)

The PSE according to claim 10, wherein the first allocated power value is less than or equal to the first requested power value, and the second allocated power value is less than or equal to the second requested power value.

### Claim 12 (depends on 8)

The PSE according to claim 8, wherein the first requested power value and the second requested power value are independent of each other.

### Claim 13 (depends on 8)

The PSE according to claim 8, wherein the first allocated power value and the second allocated power value are independent of each other.

### Claim 14 (depends on 8)

The PSE according to claim 8, wherein the first LLDPDU further carries a PD interface indication, and the PD interface indication indicates that the PD comprises two PD interfaces.

### Claim 15

A power over Ethernet (PoE) system, comprising:
a powered device (PD); and
power sourcing equipment (PSE) capable of supplying power to the PD;
wherein the PD is connected to the PSE using an Ethernet twisted pair cable, and the Ethernet twisted pair cable comprises a first set of cable pairs connected to a first PD interface of the PD and a second set of cable pairs connected to a second PD interface of the PD;
wherein the PD is configured to:
send a first link layer discovery protocol data (LLDPDU) to the PSE, the first LLDPDU carries a first requested power value for the first set of cable pairs and a second requested power for the second set of cable pairs;
wherein the PSE is configured to:
receive the first LLDPDU from the PD; and
send a second LLDPDU to the PD, wherein the second LLDPDU comprises a first allocated power value allocated by the PSE for the first set of cable pairs and a second allocated power value allocated by the PSE for the second set of cable pairs.

### Claim 16 (depends on 15)

The PoE system according to claim 15, wherein the PSE is further configured to:
supply a first power to the PD according to the first allocated power value using the first set of cable pairs; and
supply a second power to the PD according to the second allocated power value using the second set of cable pairs.

### Claim 17 (depends on 15)

The PoE system according to claim 15, wherein the PSE is further configured to:
determine the first allocated power value and the second allocated power value according to the first requested power value and the second requested power value carried in the first LLDPDU.

### Claim 18 (depends on 17)

The PoE system according to claim 17, wherein the first allocated power value is less than or equal to the first requested power value, and the second allocated power value is less than or equal to the second requested power value.

### Claim 19 (depends on 15)

The PoE system according to claim 15, wherein the first requested power value and the second requested power value are independent of each other.

### Claim 20 (depends on 15)

The PoE system according to claim 15, wherein the first allocated power value and the second allocated power value are independent of each other.

### Claim 21

A power over Ethernet method, comprising:
sending, by a powered device (PD), a first Link Layer Discovery Protocol data unit (LLDPDU) to power sourcing equipment (PSE), wherein the PSE is connected to the PD using an Ethernet twisted pair cable, and the Ethernet twisted pair cable comprises a first set of cable pairs connected to a first PD interface of the PD and a second set of cable pairs connected to a second PD interface of the PD, and wherein the first LLDPDU carries a first requested power value for the first set of cable pairs and a second requested power value for the second set of cable pairs; and
receiving, by the PD, a second LLDPDU from the PSE, wherein the second LLDPDU carries a first allocated power value allocated by the PSE for the first set of cable pairs and a second allocated power value allocated by the PSE for the second set of cable pairs.

### Claim 22 (depends on 21)

The method according to claim 21, wherein the method further comprises:
receiving, by the PD, a first power supplied by the PSE according to the first allocated power value using the first set of cable pairs; and receiving, by the PD, a second power supplied by the PSE according to the second allocated power value using the second set of cable pairs.

### Claim 23 (depends on 21)

The method according to claim 21, wherein the first requested power value and the second requested power value are independent of each other.

### Claim 24 (depends on 21)

The method according to claim 21, wherein the first allocated power value and the second allocated power value are independent of each other.

### Claim 25

A powered device (PD), comprising:
an Ethernet connector configured to connect to power sourcing equipment (PSE) using an Ethernet twisted pair cable, wherein the Ethernet twisted pair cable comprises a first set of cable pairs and a second set of cable pairs;
a first PD interface configured to connect to the first set of cable pairs via the Ethernet connector;
a second PD interface configured to connect to the second set of cable pairs via the Ethernet connector;
a memory storing program instructions; and
a processor coupled to the memory and configured to execute the program instructions; wherein, when executing the program instructions by the processor, the PD is configured to:
send a first link layer discovery protocol data unit (LLDPDU) to the PSE, wherein the first LLDPDU carries a first requested power value for the first set of cable pairs and a second requested power value for the second set of cable pairs; and
receive a second LLDPDU from the PSE, wherein the second LLDPDU carries a first allocated power value allocated by the PSE for the first set of cable pairs and a second allocated power value allocated by the PSE for the second set of cable pairs.

### Claim 26 (depends on 25)

The PSE according to claim 25, wherein when executing the program instructions by the processor, the PD is further configured to:
receive a first power supplied by the PSE according to the first allocated power value using the first set of cable pairs; and
receive a second power supplied by the PSE according to the second allocated power value using the second set of cable pairs.

### Claim 27 (depends on 25)

The PSE according to claim 25, wherein the first requested power value and the second requested power value are independent of each other.

### Claim 28 (depends on 25)

The PSE according to claim 25, wherein the first allocated power value and the second allocated power value are independent of each other.