CN105515787A - Network port and Ethernet device - Google Patents

Abstract

A network port comprises a connection port, a PD (Powered Device) unit, a PSE (Power Sourcing Equipment) unit, a control unit and a switching unit. The control unit determines the type of an external Ethernet port connected to the connection port and outputs a determination result signal correspondingly. According to the determination result signal output by the control unit, the switching unit connects the PSE unit with the connection port, or connects the PD unit with the connection port. The invention also provides an Ethernet device. According to the network port and the Ethernet device, functions of PD and PSE are integrated in one port, and the corresponding PSE or PD mode is automatically switched to according to the PSE or PD connected to the port.

Description

Network port and Ethernet device

technical field

The invention relates to a network port, in particular to an Ethernet device which integrates PD (Powered Device) and PSE (Power Souring Equipment) functions in one port.

Background technique

A Power over Ethernet (PoE) system includes two parts, a PD and a PSE, wherein the PD is a PSE load receiving power, that is, a client device of the PoE system. The PSE is the device that supplies power to the Ethernet client equipment, and is also the manager of the entire Ethernet power supply process.

In the existing PoE system, the PD function is separated from the PSE function. The PSE port can only provide power signals, and the PD port can only receive power signals. Therefore, designing a network port that can integrate PD and PSE functions in one port has become a major research topic.

Contents of the invention

In view of this, it is necessary to provide a network port that can integrate PD and PSE functions into one port.

In addition, it is necessary to provide an Ethernet device that can integrate PD and PSE functions in one port.

A network port provided by an embodiment of the present invention is used for connecting with an external Ethernet port through a network cable. The network port includes a connection port, a power receiving device unit, a power supply device unit, a control unit and a switching unit. The power supply unit is used for obtaining and outputting a power signal from an external power source. The control unit is used for judging the type of the external Ethernet port connected to the connection port and outputting a judging result signal. The switching unit is electrically connected to the connection port, the control unit, the power supply equipment unit, and the power receiving equipment unit, and is used to select whether to turn on the power supply according to the judgment result signal output by the control unit. the equipment unit and the connection port, and select whether to connect the powered equipment unit and the connection port.

Preferably, when the type of the external Ethernet port is a power receiving device port, the switching unit connects the power supply device unit and the connection port, and the switching unit does not connect the power receiving device unit and the connecting port. The connection port; when the type of the external Ethernet port is a power supply device port, the switching unit does not connect the power supply device unit and the connection port, and the switching unit connects the power receiving device unit with the connection port.

Preferably, the network port further includes a power supply device mode and a power receiving device mode, and when the switching unit connects the power supply device unit and the connection port, the power supply device unit also Mode to select whether to output the power signal to the external Ethernet port; when the switching unit connects the power receiving device unit and the connection port, the power receiving device unit also according to the network port The current mode is used to select whether to obtain the power signal from the external Ethernet port.

Preferably, when the network port is in the power supply equipment mode and the switching unit connects the power supply equipment unit and the connection port, the power supply equipment unit outputs the power signal to the external Ethernet port, otherwise The power supply unit does not output the power signal to the external Ethernet port.

Preferably, when the network port is in the powered device mode and the switching unit connects the powered device unit and the connection port, the powered device unit obtains the power from the external Ethernet port signal, otherwise the powered device unit does not obtain the power signal from the external Ethernet port.

Preferably, the switching unit includes a first electronic switch and a second electronic switch. The first electronic switch includes a first terminal, a second terminal and a control terminal. The first end is electrically connected to the connection port, the second end is electrically connected to the power supply unit, and the control end is electrically connected to the control unit. The first electronic switch is used to selectively connect the power supply unit and the connection port according to the judgment result signal output by the control unit. The second electronic switch includes a first terminal, a second terminal and a control terminal. The first end is electrically connected to the connection port, the second end is electrically connected to the powered device unit, and the control end is electrically connected to the control unit. The second electronic switch is used for selectively connecting the power receiving equipment unit and the connection port according to the judgment result signal output by the control unit.

Preferably, the connection port includes a first end and a second end. The control unit includes a detection unit and a controller. The detection unit is used for detecting the voltages of the first end and the second end. The controller is used for judging the type of the external Ethernet port connected to the connection port according to the voltages of the first end and the second end and correspondingly outputting a judgment result signal.

Preferably, the controller includes a first detection pin, a second detection pin and a third detection pin. The detection unit includes a first resistor, a third electronic switch and a second resistor. One end of the first resistor is electrically connected to the first end of the connection port and the first detection pin of the controller. The third electronic switch includes a first terminal, a second terminal and a control terminal. The first end is electrically connected to the other end of the first resistor, and the second end is electrically connected to the second end of the connection port and the second detection pin of the controller. One end of the second resistor is electrically connected to the control end of the third electronic switch, and the other end is electrically connected to the third detection pin of the controller. Wherein, the controller is used to respectively acquire the voltages of the first end and the second end of the connection port through the first detection pin and the second detection pin.

An Ethernet device provided by an embodiment of the present invention includes a power supply unit, multiple network ports and a control unit. The power supply unit is used for receiving a power signal output by an external power supply to supply power to the Ethernet device. The control unit is electrically connected to the plurality of network ports, and is used for judging the type of the external Ethernet port connected to each of the network ports, so as to output a plurality of judging result signals correspondingly. Each network port includes a connection port, a power receiving device unit, a power supply device unit and a switching unit. Each switching unit is used to select whether to connect the power supply unit and the connection port in the corresponding network port according to the judgment result signal output by the control unit, and to select whether to connect the power receiving device unit and the connection port in the corresponding network port .

Preferably, each network port also includes a power supply device mode and a power receiving device mode. When the switching unit connects the power supply device unit and the connection port in the corresponding network port, the power supply device unit also according to the network port The current mode is used to select whether to output the power signal to the external Ethernet port connected to it; when the switching unit connects the power receiving device unit and the connection port in the corresponding network port, the power receiving device unit also according to the The current mode of the network port is used to select whether to obtain the power signal from the external Ethernet port connected to it.

Preferably, when the network port is in the power supply device mode and the switching unit connects the power supply device unit and the connection port in the corresponding network port, the power supply device unit outputs the power signal to the external Ethernet port connected thereto , otherwise the power supply unit does not output the power signal to the external Ethernet port connected thereto.

Preferably, when the network port is in the power receiving device mode and the switching unit connects the power receiving device unit and the connection port in the corresponding network port, the power receiving device unit obtains the information from the external Ethernet port connected to it Otherwise, the powered device unit does not obtain the power signal from the external Ethernet port connected thereto.

Preferably, the powered device unit is further configured to obtain the power signal from the external Ethernet port connected thereto, so as to supply power to the Ethernet device when the power supply unit does not receive the power signal output by the external power supply .

Preferably, the plurality of network ports include a first network port and a second network port, and when the powered device unit of the first network port obtains the power signal from an external Ethernet port connected to it, the second network port The power supply unit of the second network port is also used to obtain and output the power signal from the power receiving unit of the first network port and the power supply unit, so as to increase the output power of the power supply unit of the second network port .

Preferably, the plurality of network ports include a first network port and a second network port, when the powered device unit of the first network port obtains the power signal from an external Ethernet port connected to it and the power supply unit When the power signal output by the external power supply is not received, the power supply unit of the second network port is further configured to obtain and output the power signal from the power receiving device unit of the first network port.

The above-mentioned network ports and Ethernet devices integrate PD and PSE functions into one port, and automatically switch to the corresponding PSE mode or PD mode according to the PSE device or PD device connected to it, and also avoid mismatching Ethernet ports. Damage to network ports or Ethernet devices while connected.

Description of drawings

FIG. 1 is a block diagram of a network port in an embodiment of the present invention.

FIG. 2 is a block diagram of a network port in another embodiment of the present invention.

FIG. 3 is a circuit diagram of a network port in an embodiment of the present invention.

FIG. 4 is a circuit diagram of a network port in another embodiment of the present invention.

FIG. 5 is a block diagram of an Ethernet device in an embodiment of the present invention.

Explanation of main component symbols

Ethernet device 100

Network port 10, 10a, 10b

Network cable 20

External Ethernet ports 30, 30a, 30b

External power supply 40

Connect port 102

Power receiving device unit 104

power supply unit 106

control unit 108

Detection unit 1082

Controller 1084

switching unit 110

Power supply unit 112

First to third electronic switches Q1, Q2, Q3

First to second resistors R1, R2

Load resistance Rpd

First to second end A1, A2

The first to third detection pins d1, d2, d3

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

FIG. 1 is a block diagram of an embodiment of a network port 10 of the present invention. In this embodiment, the network port 10 is connected to the external Ethernet port 30 through the network cable 20 . The external Ethernet port 30 may be a power supply equipment (Power Souring Equipment, PSE) port, or a powered device (Powered Device, PD) port. The network port 10 includes a PSE mode and a PD mode. When the network port 10 is in the PSE mode, the network port 10 can output power signals to supply power to the PD port electrically connected to it; when the network port 10 is in the PD mode, the network port 10 can use for receiving power signals. In this embodiment, the network cable 20 may be an RJ45 twisted pair.

In this embodiment, the network port 10 includes a connection port 102 , a PD unit 104 , a PSE unit 106 , a control unit 108 and a switch unit 110 . One end of the network cable 20 is connected to the connection port 102 , and the other end is connected to the external Ethernet port 30 . When the network port 10 is in the PSE mode, the network port 10 obtains the power signal from the external power supply 40 through the PSE unit 106 and outputs it to the PD port electrically connected to it. When the network port 10 is in the PD mode, the network port 10 passes through the PD unit 104 to receive power signals. The control unit 108 is electrically connected to the connection port 102 , and the control unit 108 judges the type of the external Ethernet port 30 currently connected to the connection port 102 and outputs a corresponding judgment result signal. The switch unit 110 is electrically connected to the connection port 102, the PD unit 104, the PSE unit 106, and the control unit 108. The switch unit 110 selects to connect the PD unit 104 and the connection port 102 according to the judgment result signal output by the control unit 108, or selects to connect to the connection port 102. The PSE unit 106 is connected to the port 102 . The network port 10 uses the switching unit 110 to select a suitable mode to match with the external Ethernet port 30 according to the type of the external Ethernet port 30 .

As a further improvement to the present invention, when the switching unit 110 connects the PSE unit 106 and the connection port 102, the PSE unit 106 can also select whether to output the power signal to the external Ethernet port 30 according to the current mode of the network port 10; when the switching unit When 110 connects the PD unit 104 and the connection port 102 , the PD unit 104 can also choose whether to obtain the power signal from the external Ethernet port 30 according to the current mode of the network port 10 . When the switch unit 110 connects the PSE unit 106 to the connection port 102 and the network port 10 is in the PSE mode, the PSE unit 106 outputs a power signal to the external Ethernet port 30 . When the switch unit 110 connects the PD unit 104 to the connection port 102 and the network port 10 is in the PD mode, the PD unit 104 obtains a power signal from the external Ethernet port 30 .

In one embodiment of the present invention, the control unit 108 can judge whether the network port 10 is switched to the PSE mode or the PD mode by reading the information of the PSE enable pin and the PD enable pin in the network port 10, and then to correspond Outputting the first control signal or the second control signal. When the switch unit 110 connects the PSE unit 106 and the connection port 102 , the PSE unit 106 outputs a power signal to the external Ethernet port 30 when the PSE unit 106 receives the first control signal output by the control unit 108 . When the switching unit 110 connects the PD unit 104 and the connection port 102 , and the PD unit 104 receives the second control signal output by the control unit 108 , the PD unit 104 obtains the power signal from the external Ethernet port 30 .

The network port 10 is realized by the control unit 108 and the switching unit 110. When it is judged that the external Ethernet port 30 is a PD port, it can be set by the user so that the network port 10 is in the PSE mode, and then the external Ethernet port 30 is connected to the external Ethernet port 30 through the PSE unit 106. Power supply; when the network port 10 determines that the external Ethernet port 30 is a PSE port, the user can set the network port 10 to be in PD mode, and then obtain the power signal from the external Ethernet port 30 through the PD unit 104 . At the same time, because in this embodiment, the control unit 108 controls the switching unit 110 to perform path switching by judging the type of the external Ethernet port 30, it can realize the protection of the network port 10, so as to avoid the mismatch between the Ethernet port and the network port. 10 causing damage.

FIG. 2 is a block diagram of another embodiment of the network port 10 of the present invention. In this embodiment, the connection port 102 includes a first end A1 and a second end A2. The control unit 108 includes a detection unit 1082 and a controller 1084 . The detection unit 1082 is electrically connected to the first end A1 and the second end A2 of the connection port 102, the detection unit 1082 detects the voltage of the first end A1 and the second end A2 of the connection port 102 and the detected voltage value Sent to controller 1084. The controller 1084 outputs a judgment result signal according to the voltages of the first terminal A1 and the second terminal A2. The switching unit 110 includes a first electronic switch Q1 and a second electronic switch Q2. The first electronic switch Q1 includes a first terminal, a second terminal and a control terminal. The first end of the first electronic switch Q1 is electrically connected to the first end A1 of the connection port 102, the second end of the first electronic switch Q1 is electrically connected to one end of the PD unit 104, and the control end of the first electronic switch Q1 is electrically connected to The controller 1084 is electrically connected to the second end A2 of the connection port 102 with the other end of the PD unit 104 . The controller 1084 outputs a judgment result signal to control the on and off of the first electronic switch Q1 to selectively connect the PD unit 104 and the connection port 102 . The second electronic switch Q2 includes a first terminal, a second terminal and a control terminal. The first end of the second electronic switch Q2 is electrically connected to the first end A1 of the connection port 102, the second end of the second electronic switch Q2 is electrically connected to one end of the PSE unit 106, and the control end of the second electronic switch Q2 is electrically connected to the control The other end of the PSE unit 106 is electrically connected to the second end A2 of the connection port 102 . The controller 1084 outputs a judgment result signal to control the turn-on and turn-off of the second electronic switch Q2 to selectively turn on the PSE unit 106 and the connection port 102 .

FIG. 3 is a circuit diagram of an embodiment of the network port 10 of the present invention. In this embodiment, the external Ethernet port 30a is a PD port. The controller 1084 includes a first detection pin d1 , a second detection pin d2 and a third detection pin d3 . The detection unit 1082 includes a first resistor R1, a second resistor R2 and a third electronic switch Q3. One end of the first resistor R1 is electrically connected to the second end A2 of the connection port 102 and the first detection pin d1 of the controller 1084 . The third electronic switch Q3 includes a first terminal, a second terminal and a control terminal. The first end of the third electronic switch Q3 is electrically connected to the other end of the first resistor R1, and the second end of the third electronic switch Q3 is electrically connected to the first end A1 of the connection port 102 and the second detection of the controller 1084. The pin d2 and the control terminal of the third electronic switch Q3 are electrically connected to one end of the second resistor R2 , and the other end of the second resistor R2 is electrically connected to the third detection pin d3 of the controller 1084 .

In this embodiment, since the external Ethernet port 30a is a PD port as an example. Therefore, the external Ethernet port 30a can be equivalent to a load resistor Rpd. When the network port 10 is in the detection mode, the third electronic switch Q3 is closed, the first electronic switch Q1 and the second electronic switch Q2 are open, and the controller 1084 sets the voltage of the first detection pin d1 as Vd1=a , the voltage of the third detection pin d3 is Vd3=0, then the voltage Vd2 of the second detection pin d2 can be calculated by the following formula:

Vd2=a*R2/[R2+(R1+Rpd)/R1*Rpd]

That is, when the controller 1084 judges that the voltage Vd2 of the second detection pin d2 satisfies the above formula, it can identify that the external Ethernet port 30a is a PD port. The controller 1084 then controls the second electronic switch Q2 to be closed, and the first electronic switch Q1 and the third electronic switch Q3 to be opened, so that the PSE unit 106 is connected to the connection port 102. When the network port 10 is in the PSE mode, the PSE unit 106 That is, the power signal can be output to the external Ethernet port 30a. Similarly, when the network port 10 is not connected to the external Ethernet port 30, the voltage Vd2 of the second detection pin d2 can be calculated by the following formula:

Vd2=a*R2/(R1+R2)

That is, when the controller 1084 determines that the voltage Vd2 of the second detection pin d2 satisfies the above formula, it can identify that the network port 10 is not connected to the external Ethernet port 30 .

In one embodiment of the present invention, if the external Ethernet port 30b connected to the network port 10 is a PSE port, as shown in FIG. 4 , the external Ethernet port 30b can be equivalent to a power supply V1. When the network port 10 is in the detection mode, the third electronic switch Q3 is closed, the first electronic switch Q1 and the second electronic switch Q2 are open, the controller 1084 monitors the voltage of the first detection pin d1, if the controller 1084 judges If there is a voltage on the first detection pin d1 and the voltage value gradually increases until reaching a preset value, then the external Ethernet port 30a can be identified as a PSE port. The controller 1084 then controls the first electronic switch Q1 to be closed, and the second electronic switch Q2 and the third electronic switch Q3 to be opened, so that the PD unit 104 is connected to the connection port 102. When the network port 10 is in the PD mode, the PD unit 104 That is, the power signal can be obtained from the external Ethernet port 30a. In this embodiment, when the controller 1084 judges that the voltage of the first detection pin d1 is 2.8V<Vd1≦10V and the voltage increase is greater than 1V within 1s, it judges that the external Ethernet port 30a is a PSE port.

In this embodiment, the PD unit 104 and the PSE unit 106 may be modules that implement the PD function and the PSE function in the existing Power over Ethernet technology, so details will not be described here. The controller 1084 can be a field programmable gate array (FPGA), a programmable logic device (PLD), a micro control unit (MCU), a digital signal processor (DSP), a central processing unit (CPU) and the like that can perform signal processing chips . The first electronic switch Q1 , the second electronic switch Q2 and the third electronic switch Q3 may be electronic switch tubes, or other modules capable of realizing switching functions according to control signals.

FIG. 5 is a schematic diagram of an embodiment of the Ethernet device 100 of the present invention. In this embodiment, the Ethernet device 100 includes a plurality of network ports 10a, 10b (in this embodiment, only two are used as an example, but not limited to two, and may include less or more network ports) and a power supply unit 112 . The power supply unit 112 obtains a power signal from the external power supply 40 to supply power to the Ethernet device 100 . In this embodiment, each network port 10a, 10b is basically the same as the network port 10 shown in FIG. The control unit 108 judges the type of the external Ethernet port 30 connected to each network port 10a, 10b, and outputs a plurality of judgment result signals correspondingly. The switching unit 110 in each network port 10a, 10b performs selective switching according to the received judgment result signal. For example, when the control unit 108 determines that the external Ethernet port 30 connected to the network port 10a is a PD port, the external Ethernet port 30 connected to the network port 10b is a PSE port. Then the switch unit 110 in the network port 10 a gates its PSE unit 106 and the connection port 102 , and the switch unit 110 in the network port 10 b gates its PD unit 104 and the connection port 102 . In other embodiments of the present invention, each network port 10a, 10b may also separately include a control unit 108 .

As a further improvement to the present invention, when the power supply unit 112 is connected to the external power supply 40, if the network port 10a is in the PSE mode and the network port 10b is in the PD mode, the network port 10a can simultaneously obtain power signals from the power supply unit 112 and the network port 10b, Therefore, the output power of the network port 10a is increased. For example, when the power supply unit 112 is connected to the external power supply 40, the network port 10a is in PSE mode, and the network port 10b is not connected to the external Ethernet port 30, the maximum output power of the network port 10a is 30W. Relatively speaking, if the power supply unit 112 is connected to the external power supply 40, and the network port 10a is in the PSE mode, and the network port 10b is in the PD mode, that is, the network port 10b also obtains the power signal from the external Ethernet port 30 at this time, then the network The maximum output power of port 10a can reach 50W.

As a further improvement to the present invention, when the power supply unit 112 is disconnected from the external power supply 40, the Ethernet device 100 can obtain a power signal from the PSE port connected to it through one or more network ports 10a, 10b to provide power to the Ethernet device 100. power supply, so that the Ethernet device 100 can work normally. At the same time, the power signal obtained by it can also be used to supply power to the PD port connected to it through other network ports, which further realizes the transfer of the power signal of the external PSE port through the Ethernet device 100 to supply power to the external PD port.

The above-mentioned network port and Ethernet device integrate PD and PSE functions into one port, and automatically switch to the corresponding PSE mode or PD mode according to the PSE device or PD device connected to it, and can also avoid mismatching Ethernet damage to network ports or Ethernet devices when the ports are connected.

Claims (15)

1. a network port, is characterized in that, the described network port comprises:

Connectivity port, for being connected with external ethernet port by grid line;

Power receiving equipment unit;

Power supply unit unit, for obtaining electric power signal from external power source and exporting;

Control unit, for judging the type of the described external ethernet port be connected with described connectivity port and exporting judging result signal; And

Switch unit, be electrically connected on described connectivity port, described control unit, described power supply unit unit and described power receiving equipment unit, judging result signal for exporting according to described control unit is selected whether to connect described power supply unit unit and described connectivity port, and selects whether connect described power receiving equipment unit and described connectivity port.

2. the network port as claimed in claim 1, it is characterized in that, when the type of described external ethernet port is power receiving equipment port, described switch unit connects described power supply unit unit and described connectivity port, and described switch unit disconnects described power receiving equipment unit and described connectivity port; When the type of described external ethernet port is power supply unit port, described switch unit disconnects described power supply unit unit and described connectivity port, and described switch unit connects described power receiving equipment unit and described connectivity port.

3. the network port as claimed in claim 1, it is characterized in that, the described network port also comprises power supply unit pattern and power receiving equipment pattern, when described switch unit connects described power supply unit unit and described connectivity port, described power supply unit unit is also selected whether to export described electric power signal to described external ethernet port according to the present mode of the described network port; When described switch unit connects described power receiving equipment unit and described connectivity port, described power receiving equipment unit is also selected whether to obtain described electric power signal from described external ethernet port according to the present mode of the described network port.

4. the network port as claimed in claim 3, it is characterized in that, when the described network port is in power supply unit pattern and described switch unit connects described power supply unit unit and described connectivity port, described power supply unit unit exports described electric power signal to described external ethernet port, otherwise described power supply unit unit does not export described electric power signal to described external ethernet port.

5. the network port as claimed in claim 3, it is characterized in that, when the described network port is in power receiving equipment pattern and described switch unit connects described power receiving equipment unit and described connectivity port, described power receiving equipment unit obtains described electric power signal from described external ethernet port, otherwise described power receiving equipment unit does not obtain described electric power signal from described external ethernet port.

6. the network port as claimed in claim 1, it is characterized in that, described switch unit comprises:

First electronic switch, comprise first end, the second end and control end, described first end is electrically connected on described connectivity port, described second end is electrically connected on described power supply unit unit, described control end is electrically connected on described control unit, and the judging result signal that described first electronic switch is used for exporting according to described control unit is selected whether to connect described power supply unit unit and described connectivity port; And

Second electronic switch, comprise first end, the second end and control end, described first end is electrically connected on described connectivity port, described second end is electrically connected on described power receiving equipment unit, described control end is electrically connected on described control unit, and the judging result signal that described second electronic switch is used for exporting according to described control unit is selected whether to connect described power receiving equipment unit and described connectivity port.

7. the network port as claimed in claim 1, it is characterized in that, described connectivity port comprises first end and the second end, and described control unit comprises:

Detecting unit, for detecting the voltage of described first end and described second end; And

Controller, exports judging result signal for judging that according to the voltage of described first end and described second end the type of the described external ethernet port connected with described connectivity port is also corresponding.

8. the network port as claimed in claim 7, is characterized in that, described controller comprises the first detecting pin, the second detecting pin and the 3rd detecting pin, and described detecting unit comprises:

First resistance, one end is electrically connected on the first end of described connectivity port and the first detecting pin of described controller;

3rd electronic switch, comprises first end, the second end and control end, and described first end is electrically connected on the other end of described first resistance, and described second end is electrically connected on the second end of described connectivity port and the second detecting pin of described controller; And

Second resistance, one end is electrically connected on the control end of described 3rd electronic switch, and the other end is electrically connected on the 3rd detecting pin of described controller;

Wherein, described controller is used for obtaining the first end of described connectivity port and the voltage of the second end respectively by described first detecting pin, the second detecting pin.

9. an Ethernet device, comprising:

Power subsystem, for receiving the electric power signal that external power source exports, to power to described Ethernet device;

Multiple network port, each network port includes connectivity port, power receiving equipment unit and power supply unit unit;

Control unit, is electrically connected on described multiple network port, for judging the type of the external ethernet port be connected with each network port described, exports multiple judging result signal with correspondence;

Wherein, each network port also comprises switch unit, the judging result signal that each switch unit is used for exporting according to described control unit is selected whether to connect the power supply unit unit in map network port and connectivity port, and selects the power receiving equipment unit whether connected in map network port and connectivity port.

10. Ethernet device as claimed in claim 9, it is characterized in that, each network port also comprises power supply unit pattern and power receiving equipment pattern, when the power supply unit unit in described switch unit connection map network port and connectivity port, described power supply unit unit is also selected whether to export described electric power signal to connected external ethernet port according to the present mode of the described network port; When the power receiving equipment unit in described switch unit connection map network port and connectivity port, described power receiving equipment unit is also selected whether to obtain described electric power signal from connected external ethernet port according to the present mode of the described network port.

11. network ports as claimed in claim 10, it is characterized in that, when the described network port is in power supply unit pattern and described switch unit connects power supply unit unit in map network port and connectivity port, described power supply unit unit exports described electric power signal to connected external ethernet port, otherwise described power supply unit unit does not export described electric power signal to connected external ethernet port.

12. network ports as claimed in claim 10, it is characterized in that, when the described network port is in power receiving equipment pattern and described switch unit connects power receiving equipment unit in map network port and connectivity port, described power receiving equipment unit obtains described electric power signal from connected external ethernet port, otherwise described power receiving equipment unit does not obtain described electric power signal from connected external ethernet port.

13. Ethernet device as claimed in claim 9, it is characterized in that, described power receiving equipment unit also for obtaining described electric power signal from connected external ethernet port, with do not receive at described power subsystem external power source export electric power signal time, described Ethernet device is powered.

14. Ethernet device as claimed in claim 9, it is characterized in that, described multiple network port comprises first network port and second network port, when the power receiving equipment unit of described first network port obtains described electric power signal from connected external ethernet port, the power supply unit unit of described second network port is also for obtaining described electric power signal and export from the power receiving equipment unit of described first network port and described power subsystem, to improve the power output of the power supply unit unit of described second network port.

15. Ethernet device as claimed in claim 9, it is characterized in that, described multiple network port comprises first network port and second network port, when described first network port power receiving equipment unit from connected external ethernet port obtain described electric power signal and described power subsystem do not receive external power source export electric power signal time, the power supply unit unit of described second network port is also for obtaining described electric power signal from the power receiving equipment unit of described first network port and export.