KR101825030B1 - Ring network apparatus and system using PoE and network recovering method for the system - Google Patents

Abstract

The present invention relates to a PoE network in which a node including an additional device requiring power is configured as a ring network and PoE (Power over Ethernet) technology is applied to reduce a wiring burden on a power supply, The present invention relates to a ring network device, a system, and a network failure recovery method using a PoE that can effectively cope with an Ethernet cable connecting a plurality of slave nodes to a master node in a ring network manner using PoE technology, The power and the power supply configuration are changed according to the failure, thereby simplifying the configuration of the line and the wiring, thereby reducing the construction cost and improving the reliability.

Description

[0001] The present invention relates to a ring network apparatus, a system, and a network failure recovery method using PoE,

The present invention relates to a ring network device, a system, and a network failure recovery method using PoE (Power over Ethernet). More particularly, the present invention relates to a ring network, To a ring network device, a system, and a network failure recovery method using a PoE that can effectively cope with a failure of a PoE ring network having power transmission direction while reducing wiring burden.

In general, a star network topology is used to connect a plurality of communication devices having a predetermined function with a master device through a network.

For example, as shown in FIG. 1, a plurality of Wi-Fi access points 30a to 30n are connected to an Ethernet switch (not shown) in the Wi-Fi access point controller 10 in order to configure a plurality of wireless access points 20 in a molding manner. As shown, the Ethernet switch 20 may be configured separately or integrally with the Wi-Fi access point controller 10.

This network topology can be applied to various types of short range access points (standard access point, WiMAX access point, Bluetooth access point, etc.), IP cameras, IP security equipment, maintenance terminals, It is also used basically for IoT devices.

However, since the network configuration of this molding method requires a separate cable connected to the Ethernet switch 20 connected to the Wi-Fi access point controller 10 for each of the individual Wi-Fi access points 30a to 30n, there is a problem.

Alternatively, there is a way to simplify cable configuration by connecting the nodes in series using a line network topology.

FIG. 2 shows a Wi-Fi access point arrangement using a general line network configuration method. As shown in the figure, the network nodes 40a to 40n, which are integrated with the Wi-Fi access point and the Ethernet switch, are connected in series with the Wi-Fi access point controller 10.

 In each of the illustrated network nodes 40a to 40n, a 3-port Ethernet switch is configured to handle inter-node communication and Ethernet frames for the access point. Therefore, since the cables are connected only between the network nodes 40a to 40n, the required length of the cable is shorter than that of the molded topology and the connection is easy.

However, in such a configuration, power is supplied to the access point and the Ethernet switch included in each of the network nodes 40a to 40n. Therefore, there is a problem that a separate wiring is necessary. In the case where a failure occurs in a part of the network connected in series, The subsequent network nodes do not operate and the reliability is low.

There is another type of bus topology, but it is difficult to cope with the high speed communication speed, so it is usually not applied to the purpose of connecting a plurality of slave nodes to a master node.

Therefore, the network structure for connecting a plurality of slave devices to the master device has a low economical efficiency and reliability due to problems of cable wiring according to the arrangement method, wiring problems for providing power, or troubles.

Korean Patent No. 10-1519624 [Title of the invention: Failure recovery method in non-reducing mode of Ethernet ring network] Korean Patent No. 10-1387981 [Title of the invention: Method, apparatus, system and computer readable recording medium for providing power using PoE] Korean Patent No. 10-0864768 entitled " Common-Mode Data Transmission for PoE System "

SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem by providing a PoE (WiFi) access point controller for simplifying a line configuration of a network connecting a plurality of slave nodes (e.g., WiFi access points) Power over Ethernet) technology to provide data and power simultaneously through an Ethernet cable connecting nodes. In addition, the master node and the slave node are configured as a ring network in order to cope with a failure in the network path, (Power Source Equipment) that supplies PoE and Power Device (PDE) that receives power, and can change the power supply direction by using a PoE Ring network device, system and network failure using To provide the old way.

It is another object of the present invention to provide a ring network apparatus using a PoE that prevents switching of a PD and a PSE constituting each node of a ring network, , And a system and network failure recovery method.

It is still another object of the present invention to provide power to each node of a ring network through PoE technology, to provide power-related configuration information to each node in a normal setting or in the event of a failure, And the control information about whether power is supplied or not. However, the information is transmitted / received through the additional header for supporting the virtual LAN set in the Ethernet frame standard, so that the bypass path of the ring network using PoE And to provide a ring network device, a system, and a network failure recovery method using the PoE capable of enabling the PoE.

A ring network apparatus using PoE (Power over Ethernet) according to an embodiment of the present invention includes a pair of matching units for receiving and transmitting power and data, and a power source for receiving power received through one of the matching units A PSE (Power Source Equipment) for transmitting power to a subsequent ring network apparatus through one of the matching units, a path switch unit for selectively connecting the pair of matching units to the PD and the PSE, An Ethernet switch unit connected to the pair of matching units to transmit and receive data, a network load connected to the Ethernet switch unit, a network load connected to the Ethernet switch unit, the path switch unit and the network load, And a control unit for reporting information on the configuration to the master node and controlling the path switch unit for failure countermeasure or restoration.

The control unit can report failure information or power state information to the master node configured in the ring network, receive power state change information from the master node, and control the path switch unit to perform failure response or restoration.

The controller may send and receive failure information, power state configuration information, and power state change information to a master node through an additional header for supporting a virtual LAN of an Ethernet frame. Here, the controller may use a 16-bit TPID (Tag Protocol Identifier) unspecified type of the 802.1Q header as an additional header for supporting the virtual LAN.

The network load may be at least one of a standard access point, a Wi-Fi access point, a WiMAX access point, a Bluetooth access point, an IP camera, an IP security device, a maintenance terminal, an IoT device, or a combination thereof.

The ring network system using PoE (Power over Ethernet) according to another embodiment of the present invention communicates with the network load of each slave node, supplies power to the connected slave nodes in PoE mode, A master node for receiving the power state configuration information of the master slave node and the slave node and providing the power status change information to the slave node and the slave node, a network load for communicating with the master node, And a path switch unit for selectively switching the PSE, the PD, and the PSE or cutting off the power supply to the PSE, and reports information on the network failure or power state configuration to the master node, And a slave node including a control unit for controlling the switch unit.

The slave node can automatically control the path switch unit according to the fault status or receive the power status change information from the master node to control the path switch unit.

The master node and the slave node can transmit / receive the failure status information, the power status configuration information, and the power status change information using the 16-bit TPID unspecified type of the 802.1Q header inserted in the Ethernet frame.

According to another embodiment of the present invention, there is provided a network fault recovery method of a ring network system using PoE, which comprises a master node supplying a signal and a power supply simultaneously and a plurality of slave nodes connected to the master node by a line, A slave node including a pair of matching units for receiving or transmitting power, a power source device (PD) using a receiving power source as a device power source, and a power source equipment (PSE) for transmitting power to a subsequent slave node Wherein the master node is configured in a ring network mode, wherein the master node supplies power to the connected bidirectional slave nodes and configures the slave nodes to be inactivated when the slave nodes are connected to each other, The slave slave node does not receive information about the failure and power state organization Transmitting to the slave node power state change information for setting the active or inactive state of the PD and PSE switching or the PSE power supply to the slave nodes corresponding to the failure occurrence by the master node; The node includes power state change information from the master node to control the path switch unit to switch the PD and the PSE or to activate or deactivate the state of the PSE.

Receiving the failure recovery information from the manager or the slave node by the master node and sequentially transmitting the power state change information to the slave node for failure recovery to restore the initial state without power conflict.

A ring network apparatus, a system, and a network failure recovery method using PoE according to an embodiment of the present invention connect a plurality of slave nodes to a master node in a ring network manner, and connect the nodes using PoE (Power over Ethernet) Ethernet cable provides data and power at the same time. By varying the power handling configuration according to the failure, it simplifies the wiring and wiring configuration, reducing the installation cost and improving the reliability.

In the ring network device, system, and network fault recovery method using PoE according to the embodiment of the present invention, a PSE (Power Source Equipment) that supplies power when a failure occurs and a PD (Powered Device) that receives power are switched, It is possible to change the power supply direction when a failure occurs and control the activation of the PSE so as to prevent a power collision, thereby enabling a stable network operation.

The Ring network device, system, and network failure recovery method using PoE according to an embodiment of the present invention is a method for recovering a failure, power state, and power state change information between a slave node and a master node through an additional header for supporting a virtual LAN So that it is possible to cope with a failure of the ring network of the PoE system while obeying the standard.

1 is an example of a molded network configuration.
2 shows an example of a linear network configuration.
3 shows an example of a linear network configuration using PoE.
4 is an example of a ring network configuration using PoE.
5 is an example of a ring network configuration according to an embodiment of the present invention.
6 is an example of a network device configuration according to an embodiment of the present invention;
FIG. 7 and FIG. 8 are conceptual diagrams for explaining a ring network failure handling method according to an embodiment of the present invention;
FIG. 9 is an exemplary diagram illustrating an information transmission frame structure according to an embodiment of the present invention; FIG.

It is noted that the technical terms used in the present invention are used only to describe specific embodiments and are not intended to limit the present invention. In addition, the technical terms used in the present invention should be construed in a sense generally understood by a person having ordinary skill in the art to which the present invention belongs, unless otherwise defined in the present invention, and an overly comprehensive It should not be construed as meaning or overly reduced. In addition, when a technical term used in the present invention is an erroneous technical term that does not accurately express the concept of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art can be properly understood. In addition, the general terms used in the present invention should be interpreted according to a predefined or context, and should not be construed as being excessively reduced.

Furthermore, the singular expressions used in the present invention include plural expressions unless the context clearly dictates otherwise. The term "comprising" or "comprising" or the like in the present invention should not be construed as necessarily including the various elements or steps described in the invention, Or may include additional components or steps.

In addition, terms including ordinals such as first, second, etc. used in the present invention can be used to describe elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

In particular, in describing the present invention, terms such as a network device and a node may be used interchangeably, but this should be construed to mean a network device used as a node. Also, it is abbreviated to PoE or PoE applied to a network to which PoE (Power over Ethernet) is applied. It is composed of a PSE (Power Source Equipment) configured to supply power to a node to which PoE technology is applied and a PD Powered Device) refers to a functional unit or device, which means a functional block made up of electrical components for performing a corresponding function.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.

FIG. 3 shows an example of a linear network configuration using PoE (Power over Ethernet). PoE is a technology that simultaneously transmits data signals and power through an Ethernet cable. When a signal and a power supply are simultaneously received through a transformer (matching unit) formed at an Ethernet input terminal, the power is received as power for the device, Through a transformer so that subsequent network devices can use it as a power source.

For this purpose, each network device includes a powered device (PD) that collects power from a transformer and uses it as a device power source, and a power source equipment (PSE) that delivers the received power to an output transformer to be transmitted to a subsequent network device.

The illustrated configuration is for configuring a plurality of wireless WIFI access points (APs) in a wide area. The WIFI access point controller 50 includes a plurality of network devices 60a to 60n, each including a Wi-Fi access point, And is provided in the Wi-Fi access point controller 50 up to the power source so that a separate power wiring is not required.

The WiFi access point controller 50 is constituted by a PSE 51 for providing power, and each of the network devices 60a to 60n includes a PD 61 that uses power internally received as power for the device, A wireless access point 64, a Wi-Fi access point controller 50, and an Ethernet switch 63 for processing communications with neighboring network devices.

The master node 50 and the plurality of slave nodes 60a to 60n linearly connected to the corresponding master node are capable of high-speed communication by the Ethernet switch 63 provided in each slave node, Since the PoE function can be supplied to the power supply through the communication line, it is possible to simplify the construction of the line and reduce the construction cost.

However, in the case of such a configuration, if one of the line part or the device fails, the succeeding slave node can not operate when a failure occurs because communication or power supply is interrupted. Due to such a decrease in network reliability, the configuration is difficult to be commercially constructed.

FIG. 4 shows an example of ring network configuration using PoE. As shown in FIG. 4, a PoE function is added to a ring network configuration capable of responding to a failure occurrence.

As shown in the figure, the Wi-Fi access point controller 70 includes a PSE 71 for providing power and a PD 72 for receiving power, and each of the network devices 80a to 80d has the same configuration as that described above with reference to FIG. 3 PD, PSE, Ethernet switch, and wireless WiFi access point, which are connected in sequence to form a closed loop.

However, since the PSE 71 of the Wi-Fi access point controller 70 must supply power to all the network devices 80a to 80d in order to maintain the supply direction of the power as shown in the figure, And if one of the line or network devices fails, even though the reverse signaling is possible, the power supply is impossible, so that the network devices after the failure can not operate.

If a power unit (such as a battery) is configured to operate for a long time in order to cope with a failure, the data can be diverted forward and backward while the corresponding power source is operating. However, each network device internally has an Ethernet switch or Wi- , The failure response time that can be operated by the internal power source is limited, and the cost for the separate configuration of the power source portion is high, and when the battery is used, the life-time management problem also occurs. Therefore, the method of FIG. 4 is also less reliable and is not practically applicable.

In order to solve such a problem, in an embodiment of the present invention, a new network device and system capable of switching a signal and a power direction in response to a fault while constructing a ring network using PoE network devices in which power directionality exists Provides a fault response method.

5 and 6 illustrate a configuration of a ring network according to an embodiment of the present invention and a network device used as a node of a corresponding ring network.

In the illustrated example, the master node takes the Wi-Fi access point controller 100 as an example, and the slave node has a Wi-Fi access point as an internal network load. The network load of the master node and the slave node may vary.

As shown in the figure, the Wi-Fi access point controller 100 corresponding to the master node includes PSEs 110 and 120 that supply power to each of the bidirectional slave nodes connected to the ring network. The network device corresponding to each slave node includes a powered device (PD) that uses the reception power source as the device power source and a power source equipment (PSE) that delivers power to the subsequent network device. (Power off) the PSE power (power supplied to the line through the PSE) of one network device 200b among the network devices 200b and 200c.

That is, when power-activated PSEs are connected to each other, a power conflict occurs. Therefore, the PSE power of at least one of the network devices 200b and 200c corresponding to the node B or the node C is inactivated to prevent a power conflict.

Meanwhile, in the network line configuration using the PoE technology, since the bidirectional communication is possible regardless of power, the first PSE 110 can communicate with the connected network devices 200a and 200b The second PSE 120 provides power to the connected network devices 200d and 200c and the signaling between all the network devices 200a through 200d, irrespective of this power provisioning, It is possible to forward or backward.

In this case, when a failure occurs in a line at a predetermined position, the network devices 200a to 200d communicate with the Wi-Fi access point controller 100 corresponding to the master node through a reverse path through the forward and backward directions, However, since the power supply has a directionality, some network devices are not operated due to the interruption of the power supply due to the occurrence of the line failure, thereby extending the range of the failure.

For example, when a failure occurs in a line between the network device 200c corresponding to the node C and the network device 200d corresponding to the node D, the network device 200c corresponding to each node C no longer corresponds to the node D The operation is interrupted because power is not supplied from the network device 200d.

In order to solve this problem, the present invention configures a network device so that the PD and the PSE can be switched (switching the power input / output direction) or the PSE can selectively be activated or deactivated.

6 shows an example of a configuration of a network device 200 according to an embodiment of the present invention, which is a slave node having a Wi-Fi access point 260 as a network load.

As shown in the figure, the network device 200 includes matching units 215 and 225, each of which includes a pair of transformers for receiving and transmitting power and data, and a power source, which is received through one of the matching units 215 and 225, A PSE 220 for transmitting power to a subsequent ring network apparatus through one of the matching units 215 and 225 and a pair of matching units 215 and 225 and a PD 210 A path switching unit 230 for selectively connecting the PSE 220 and the Ethernet switch unit 240 to the PSE 220, an Ethernet switch unit 240 connected to the pair of matching units to transmit and receive data, The network switch unit 260 is connected to the Ethernet switch unit 240 and the path switch unit 203 and the Wi-Fi access point 260 to report information on the network failure or power state configuration to the master node And a path switch It is configured to include a controller 250 that controls 230.

Here, the PD 210 plays a role of supplying power to the path switch unit 230, the control unit 250, the Ethernet switch unit 240, the Wi-Fi access point 260, and the PSE 220 of the network device 200 And acquires power from one of the matching units 215 and 225 made of a transformer.

The PSE 220 is connected to one of the matching units 215 and 225 to supply power through the line. The PSE 220 is activated (powered on) and deactivated Power off).

The path switch unit 230 may connect one of the matching units 215 and 225 to the PD 210 and connect the other of the matching units 215 and 225 to the PSE 220 according to the control of the controller 250, It is possible to determine the power supply reception direction and the supply direction.

The control unit 250 controls the master node configured in the ring network to detect a network failure (by detecting the state of the connected matching unit through an electrical connection state or signal presence or the like) or a power state configuration (matching unit 215 by the current path switch unit 230) And information on the power state change information (the information on the connection state of the matching unit 215, the power state change unit 210, and the PDE 210, the connection state of the PSE 220, and the activation / deactivation state of the PSE) The connection of the PD 210 and the PSE 220 and the activation / deactivation state of the PSE) from the master node to control the path switch unit 230. If necessary, Prior safety measures may be taken, such as disabling the PSE without specific power state change information.

The network device 200 may include at least one of a standard access point, a WiMAX access point, a Bluetooth access point, an IP camera, an IP security device, a maintenance terminal, and an IoT device instead of the Wi-Fi access point 260, As shown in FIG.

FIGS. 7 and 8 are conceptual diagrams for explaining a process for responding to a failure using the network device 200 shown in FIG. 6, and FIG. 7 shows the configuration of FIG. 5 briefly described above in more detail.

As shown, the Wi-Fi access point controller 100 corresponding to the master node is connected to the network devices 200a to 200d through a ring network, and the PSEs 110 and 120 configured in the Wi-Fi access point controller 100 are connected to a connected network And supplies power to the devices 200a to 200d. Here, the PSE of the one network device 200b among the network devices 200b and 200c connected to each other by the PSEs is in an inactive state and is initially set to prevent a power collision.

The power states of the network devices 200a to 200d, i.e., the slave nodes in this state may be determined based on the initial setting information of the Wi-Fi access point controller 100, i.e., the master node, .

It is possible to construct a ring network through the minimum line wiring using the network devices 200a to 200d.

In this environment, when a failure occurs in some of the lines, the communication signal is transmitted to the bypass path in order to cope with the failure, and the power transmission direction using the PoE is appropriately changed by changing the power state of the network devices, The power supply for the power supply is maintained.

When a failure occurs in the line between the network device 200c corresponding to the node C and the network device 200d corresponding to the node D as shown in the example of FIG. 8, the network device 200c corresponding to the node C or the node D The corresponding network device 200d reports the failure occurrence information to the Wi-Fi access point controller 100 corresponding to the master node. Upon receiving the failure occurrence information, the Wi-Fi access point controller 100 responds to the occurrence of the failure, Power state change information for setting an active or inactive state of the PD and PSE switching or the PSE power for the network devices 200b, 200c, and 200d corresponding to the slave nodes (nodes B, C, and D) .

In the illustrated example, the path PD and the PSE are switched to change the power supply direction of the network device 200c corresponding to the node C, and the PSE of the network device 200d corresponding to the node B that has been inactivated is switched to the active state The power supply state is changed so that the network device 200c corresponding to the node C can receive power. In addition, since the faulty line can be restored or irregularly connected due to a variable situation, the PSE of the network device 200d corresponding to the node D is switched to the inactive state.

This power state change can be sequentially switched (in order to deactivate PSE of node D, switch PD / PSE of node C, activate PSE of node B, etc.) in order to lower the electrical risk, and may be switched at once.

On the other hand, in the case of the node C, since the power supply is cut off due to the line failure, it may be necessary to supply power for the failure information transmission or power state change for the failure recovery. Thus, the network device may internally include a temporary power source (capacitor, battery, battery, etc.) that can temporarily power up for a short time within a few seconds for such failure recovery.

If the faulty line is to be repaired and restoration is necessary, restoration can be performed by changing the power state in order of PSE deactivation of the node B, PD / PSE switching of the node C, and PSE activation of the node D in order to prevent power shock. Of course, restoration is not necessary because there is no hindrance to network operation even if it is not restored.

When a new frame format is defined to transmit / receive failure information, power state configuration information, and power state change information between the master node and the slave node in the network failure recovery process of the ring network system using the PoE, The embodiment utilizes the standard Ethernet frame as it is but utilizes the header information added for the virtual LAN support.

FIG. 9 is an exemplary diagram illustrating an information transmission frame structure according to an embodiment of the present invention, and shows an IEEE 802.1Q Ethernet frame structure supporting a virtual LAN (VLAN) in an Ethernet network.

As shown, an Ethernet frame is used in which a 32-bit 802.1Q header field 310 is added between a source MAC address and an Ethertype (length) field of a basic Ethernet frame.

The 802.1Q header field consists of a Tag Protocol Identifier (TPID) of 16 bits in length and a Tag Control Information (TCI) field of 16 bits in length. In the embodiment of the present invention, for the ring network failure recovery using the PoE for the embodiment of the present invention by designating the unspecified type among the various Etheret values defined by the TPID set to the first two octet length (16 bits) Can be utilized. For example, 0x8768 can be defined and used as an information exchange type for the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Wi-Fi access point controller 200a to 200d: Network device
210: PD 215:
220: PSE 225:
230: path switch unit 240: Ethernet switch unit
250: Control section 260: Wi-Fi access point

Claims (10)

As a ring network device using PoE (Power over Ethernet)
A pair of matching units for receiving and transmitting power and data;
A PD (Powered Device) that uses a power received through one of the matching units as a device power source;
A power source equipment (PSE) for passing power to the subsequent ring network device through one of the matching units;
A path switch unit selectively connecting the pair of matching units to the PD and the PSE;
An Ethernet switch unit connected to the pair of matching units to transmit and receive data;
A network load connected to the Ethernet switch unit;
And a control unit connected to the Ethernet switch unit, the path switch unit, and the network load to report information on the network failure or power state configuration to the master node, and to control the path switch unit to respond to or recover from the failure,
Wherein,
And the power state change information to and from the master node through an additional header for supporting a virtual LAN of an Ethernet frame, and further includes a 16-bit TPID tag of the 802.1Q header as an additional header for supporting the virtual LAN Protocol Identifier (PoE) unspecified type.
The method of claim 1, wherein the control unit reports information on a network failure or power state configuration to a master node configured in the ring network, receives power state change information from the master node, and controls the path switch unit, The PoE-based ring network apparatus comprising:
delete delete The network load according to claim 1, wherein the network load is at least one of a standard access point, a Wi-Fi access point, a WiMAX access point, a Bluetooth access point, an IP camera, an IP security device, a maintenance terminal, Ring network device using PoE.
It communicates with the network load of each slave node, supplies power to the connected slave nodes in PoE mode, receives power failure status information of the slave node, and changes the power state of the slave node and the adjacent slave nodes A master node for providing information;
A network load for communicating with the master node, a PD for receiving power through a line, a PSE for supplying power through a line, and a path switch unit for selectively switching the PD and the PSE or for shutting off the power of the PSE, A slave node including a control unit for reporting information on a network failure or a power state configuration to the master node and controlling the path switch unit for failure countermeasure or restoration,
The master node and the slave node,
Wherein the failure state information, the power state configuration information, and the power state change information are transmitted and received using the 16-bit TPID unspecified type of the 802.1Q header inserted in the Ethernet frame.
The ring network system using PoE according to claim 6, wherein the slave node automatically controls the path switch unit according to the failure status or receives the power status change information from the master node and controls the path switch unit.
delete 1. A network fault recovery method for a ring network system using a PoE, comprising a master node supplying a signal and a power supply at the same time, and a plurality of slave nodes connected by a line to the master node,
A pair of matching units for receiving and transmitting power and data, and a path switch unit for selectively connecting a PD (Powered Device) using the reception power source as the device power source and a PSE (Power Source Equipment) for transmitting power to the subsequent slave node The slave nodes are connected to the master node in a ring network mode, and the master node supplies power to the connected bidirectional slave nodes, and when the slave nodes are connected to each other, the slave nodes are deactivated ;
When the failure occurs, the slave node reports failure and power state configuration information to the master node;
Transmitting power state change information to the slave node, the power state change information setting the PD and the PSE switching or the PSE power source active or inactive state for the slave nodes corresponding to the failure occurrence of the master node;
Wherein the slave node receives the power state change information from the master node and controls the path switch unit to switch the PD and the PSE or to activate or deactivate the state of the PSE,
The master node and the slave node,
Wherein the failure status information, the power status configuration information, and the power status change information are transmitted / received using a 16 bit TPID unspecified type of an 802.1Q header inserted in an Ethernet frame. .
The method of claim 9, wherein the master node receives the failure recovery information from an administrator or a slave node;
And transmitting the power state change information to the slave node in order to restore the failure state to the initial state without power conflict.

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