KR20100001686A

KR20100001686A - Apparatus for relaying ethernet signal, and communication network system having the said apparatus, and method for recovery communication fault using the said apparatus

Info

Publication number: KR20100001686A
Application number: KR1020080061697A
Authority: KR
Inventors: 김근영; 김진희
Original assignee: 주식회사 케이티
Priority date: 2008-06-27
Filing date: 2008-06-27
Publication date: 2010-01-06

Abstract

The present invention relates to an Ethernet signal relay device, a communication network system having the same, and a method for recovering a communication failure using the Ethernet signal relay device. The present invention transmits the Ethernet signal received from the outside to the upper Ethernet signal transmitter for transmitting the Ethernet signal to the lower Ethernet signal transmitter subordinate to the user terminal or itself, and received from the outside when a failure is detected in the upper Ethernet signal transmitter The present invention provides an Ethernet signal relay device comprising an Ethernet signal switching unit for directly transmitting an Ethernet signal to a lower Ethernet signal transmitter. According to the present invention, it is possible to provide a communication service of continuous and stable quality by preventing the communication service from being disconnected or broken frequently. In addition, it is possible to save maintenance costs or maintenance time required for service operation, and to provide high quality communication services.

Description

Apparatus for relaying ethernet signal, and communication network system having the said apparatus, and method for recovery communication fault using the Ethernet signal relay device and communication network system having same said apparatus}

The present invention relates to an Ethernet signal relay device, a communication network system having the same, and a method for recovering a communication failure using the Ethernet signal relay device. More specifically, an Ethernet signal relay device for overcoming a communication obstacle in a communication network system based on an Ethernet switch or an optical node unit (ONU) used for high-speed Internet access service in an apartment, etc. A communication network system, and a method for recovering from communication failure using the Ethernet signal relay device.

Recently, a communication network preferred by a telecommunications carrier is a so-called optical LAN scheme, in which multiple subscribers share network resources (bandwidth) by connecting multiple low-cost Ethernet switches. This method is widely used due to low operation cost due to maintenance because the Internet service can be provided by simply connecting a subscriber PC LAN card to the Ethernet switch using a UTP cable without a modem. Applying this method to an apartment, a network in the apartment is constructed by installing an Ethernet switch for concentrating in an apartment communication room, installing an Ethernet switch for subscribers in underground communication equipment distributed in each building, and interconnecting them with optical cables. can do. When the user's computer is connected to the communication network thus constructed, that is, the subscriber acceptance Ethernet switch by UTP, the user can be provided with the desired Internet service at any time.

However, when the number of service users increases in each apartment building, an additional subscriber acceptance Ethernet switch must be installed in order to provide a smooth service, and the subscriber acceptance Ethernet switch must be connected to the aggregation Ethernet switch. However, because the construction of the optical cable in the apartment is not easy, it takes much time, and the cost of laying the optical cable is also high. Ethernet switch) with optical patch cord to achieve the above object.

However, if a device failure occurs because the switching means or the CPU and the like provided in the master Ethernet switch are not redundant, the slave Ethernet switches connected to the master Ethernet switch in multiple stages also suffer from communication failure. In addition, since the master Ethernet switch is usually installed outside the telephone station, if a failure occurs, it requires a trouble-shooting agent on-site, which causes a lot of maintenance cost and maintenance time.

Moreover, in the case of receiving high-quality video services requiring high bandwidth such as IP TV and VOD, consumer complaints will be very high if streaming is not performed properly, and thus the situation where the improvement of the master Ethernet switch is urgently required.

The present invention has been made to solve the above-described problems, Ethernet detects the communication failure or CPU overload generated in the Ethernet switch Ethernet switch to bypass the optical signal received from the aggregation Ethernet switch to the slave Ethernet switch using the switch for switching An object of the present invention is to provide a signal relay device, a communication network system including the same, and a method for recovering a communication failure by using the Ethernet signal relay device.

The present invention has been made to achieve the above object, and transmits the Ethernet signal received from the outside to the upper Ethernet signal transmitter for transmitting the Ethernet signal to the lower Ethernet signal transmitter dependent on the user terminal or itself, When the Ethernet signal transmitter detects a failure, the Ethernet signal relay device includes an Ethernet signal switching unit for directly transmitting the Ethernet signal received from the outside to the lower Ethernet signal transmitter.

Preferably, the Ethernet signal relay device includes a malfunction detection unit for detecting whether a malfunction occurred in the upper Ethernet signal transmission unit; Or an overload detector for detecting whether the upper Ethernet signal transmitter is overloaded.

Preferably, the Ethernet signal relay device is an Ethernet signal transmitting and receiving unit for transmitting the Ethernet signal received from the outside to the lower Ethernet signal transmitter; And an Ethernet signal processor for transmitting the electrical signal to the user terminal when the Ethernet signal received from the Ethernet signal transceiver is converted into an electric signal containing a data packet.

Preferably, the Ethernet signal switching unit receives the Ethernet signal from the outside, and transmits the received Ethernet signal to the upper Ethernet signal transmitter; A second switch for transmitting the Ethernet signal received from the upper Ethernet signal transmitter to the lower Ethernet signal transmitter; And a switch controller configured to allow the second switch to directly receive an Ethernet signal received from the outside from the first switch when a failure is detected in the upper Ethernet signal transmitter.

In addition, the present invention provides a user terminal which is a means for connecting a user; A lower ethernet signal transmitter for directly exchanging traffic with the user terminal; And transmits the Ethernet signal received from the outside to an upper Ethernet signal transmitter for transmitting an Ethernet signal to the lower Ethernet signal transmitter dependent on the user terminal or itself, and if the failure is detected in the upper Ethernet signal transmitter, It provides an Ethernet-based communication network system comprising an Ethernet signal relay device for directly transmitting the Ethernet signal received from the lower Ethernet signal transmitter.

In addition, the present invention (a) transmits the Ethernet signal received from the outside to the upper Ethernet signal transmitter for transmitting the Ethernet signal to the lower Ethernet signal transmitter subordinate to the user terminal or itself, the failure of the upper Ethernet signal transmitter Determining whether it is detected; And (b) if an error is detected in the upper Ethernet signal transmitter, recovering a communication failure by directly transmitting the Ethernet signal received from the outside to the lower Ethernet signal transmitter. Provided is a method for recovering from a communication failure using a device.

According to the present invention, the following effects are produced. First, when detecting a communication failure or CPU overload occurring in the Ethernet switch, the switching service is used to bypass the optical signal received from the aggregation Ethernet switch to the subordinate Ethernet switch, thereby preventing the communication service from being disconnected or broken frequently. It can prevent and provide continuous and stable quality communication service. Second, continuous and stable quality communication service can save maintenance cost or maintenance time required for operation, and it can improve customer satisfaction and customer loyalty without interruption of communication service. Third, Ethernet switches can be extended to provide high quality communication services such as IP TV and VOD.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the following will describe a preferred embodiment of the present invention, but the technical idea of the present invention is not limited thereto and may be variously modified and modified by those skilled in the art.

1 is a conceptual diagram of an Ethernet switch-based communication network system according to a preferred embodiment of the present invention. As shown in FIG. 1, the Ethernet switch-based communication network system 100 includes an aggregation Ethernet switch 110, an Ethernet signal relay device 120, one or more subscriber acceptance Ethernet switches 130, and a subscriber station 140. ).

The Ethernet switch-based communication network system 100 according to the present invention refers to an Ethernet switch-based subscriber communication network for providing high speed Internet access service in a dense residential area such as an apartment. The Ethernet switch-based communication network system 100 includes an Ethernet switch 110 for concentrating located in an apartment communication room and a subscriber receiving Ethernet switch 130 located in an underground communication box or a floor terminal box for each apartment building. In this case, an optical cable is used as a connection medium between the aggregation Ethernet switch 110 and the subscriber receiving Ethernet switch 130 or between two subscriber receiving Ethernet switches 130, and the subscriber receiving Ethernet switch 130 and the subscriber station 140 UTP (Unshielded Twisted Pair) cable is used as a connection medium. Of course, an optical cable may also be used as a connection medium between the subscriber acceptance Ethernet switch 130 and the subscriber station 140.

The subscriber acceptance Ethernet switch 130 aggregates the upstream traffic 141 generated from the subscriber station 140 through the UTP port 131 accommodated therein, and aggregates the aggregated upstream traffic 141 into an upper aggregation Ethernet switch ( 110). In addition, the subscriber acceptance Ethernet switch 130 transmits the downlink traffic 101 transmitted from the aggregation Ethernet switch 110 to the lower subscriber station 140 with reference to the MAC (Media Access Control) table.

The aggregation Ethernet switch 110 provides the downlink traffic 101 introduced from the outside to the subscriber acceptance Ethernet switch 130. Such a converged Ethernet switch 110 is usually connected to and operated with 15 to 18 subscriber acceptance Ethernet switch 130.

However, there is a need for a new subscriber to appear and the subscriber acceptance Ethernet switch 130 needs to accommodate it, or to provide services that require broadband bandwidth, such as Internet TV and video on demand (VOD) services. do. In this case, it is preferable to install the subscriber acceptance Ethernet switch 130 in addition. If the subscriber acceptance Ethernet switch 130 is additionally installed, the subscriber acceptance rate of each subscriber acceptance Ethernet switch 130 is lowered, thereby ensuring more bandwidth for each subscriber. In addition, even if a new subscriber appears, sufficient acceptance thereof becomes possible.

However, in order for the added subscriber acceptance Ethernet switch 130 to function properly, it must be connected to the aggregation Ethernet switch 110. However, if there is a shortage of optical cores already installed or if the construction of the optical cable is prohibited due to the aesthetics of the apartment or the like, there is no choice but to connect the upper Ethernet switch (master Ethernet switch) directly connected to the aggregation Ethernet switch 110. 2 to 10 lower Ethernet switches (slave Ethernet switches) may be connected to the upper Ethernet switch in multiple stages. If the upper Ethernet switch causes communication failure, all lower Ethernet switches connected to the upper Ethernet switch accompany the communication. Suffer from disabilities.

Thus, the present invention is characterized in that it comprises an Ethernet signal relay device 120 including an upper Ethernet switch between the Ethernet switch 110 for aggregation and the lower Ethernet switch 130. However, the Ethernet signal relay 120 is not necessarily limited to the above, and may be implemented as an Ethernet signal switching unit in front of a separately installed upper Ethernet switch. Hereinafter, the Ethernet signal relay device 120 will be described in more detail with reference to FIG. 2.

On the other hand, the cause of communication failure is as follows. First, CPU overload occurs due to harmful traffic processing such as a virus generated in subscriber terminal 140, and therefore, Ethernet switch does not properly transmit data packets to other switches connected in multiple stages. Second, a failure or malfunction of the Ethernet switch itself causes a communication failure. Third, a problem occurs in the interface part of a specific Ethernet switch connected to another Ethernet switch, resulting in communication failure.

2 is a conceptual diagram of an Ethernet signal relay apparatus according to a preferred embodiment of the present invention. As shown in FIG. 2, the Ethernet signal relay device 120 according to a preferred embodiment of the present invention includes two switches 201 and 202, a switch controller 203 for controlling the two switches 201 and 202, and And an Ethernet signal switching unit 200 including a function failure detection unit 213, a first optical signal transceiver 211, a second optical signal transceiver 212, an Ethernet signal processor 221, and an Ethernet signal converter. 231, physical connections 241, and the like.

In the above description, the first optical signal transceiver 211, the second optical signal transceiver 212, the Ethernet signal processor 221, the Ethernet signal converter 231, the physical connection unit 241, and the like are connected to the Ethernet signal switching unit ( If it is provided separately in 200 may be implemented as a higher Ethernet signal transmitter including them.

The first switch 201 receives an optical signal from the aggregation Ethernet switch 110 and transmits it to the optical signal transceiver 211 through one output port or to the second switch 202 through another output port. send. The first switch 201 is implemented as a switch type to perform this function, as is the case of the second switch 202. The first switch 201 and the second switch 202 may be implemented by any one of a mechanical switch, a MEMS switch, and a PLC optical switch.

The second switch 202 transmits the optical signal received through the two optical signal transceivers 211 and 212 or the optical signal received from the first switch 201 to the lower Ethernet switch 130. In general, when the Ethernet signal relay 120 normally operates, a signal processed by the Ethernet signal processor 221 is transmitted to the second switch 202 as an optical signal through the second optical signal transceiver 212. The second switch 202 transmits the optical signal to the lower Ethernet switch 130. In this case, the second switch 202 transmits the optical signal to the lower Ethernet switch 130 through the optical patch cord connected to the output port.

The two switches 201 and 202 are determined to which output port to switch by the switch control unit 203. In the present invention, the two switches 201 and 202 may be implemented as an automatic transfer switch (ATS). For example, the first switch 201 and the second switch 202 are normally connected to the first optical signal transceiver 211 and the second optical signal transceiver 212, respectively, and are automatically switched in an emergency. The two switches 201 and 202 are connected to each other.

The first optical signal transceiver 211 provides a function of providing an optical signal input through the first switch 201 to the Ethernet signal converter 231, and the second optical signal transceiver 212 converts the Ethernet signal. The optical signal passing through the unit 231 is provided to the second switch 202. The second optical signal transceiver 212 may be implemented as an optical transmitter for multi-stage connection in an embodiment of the present invention.

If the Ethernet signal relay 120 does not operate normally, such as a communication failure, a service failure, a device malfunction, or a function suspension, this is because the first optical signal transceiver 211 does not perform its function. Therefore, the present invention further includes a function failure detection unit 213 to detect whether the first optical signal transceiver 211 and the second optical signal transceiver 212 are properly performing the function.

The function failure detection unit 213 detects a failure or malfunction of the optical signal transceiver 211 or 212 as follows. The laser generated by the optical signal transceiver, which is usually implemented as an optical transceiver, is turned on only when sending data, and light output of a constant intensity is generated while the laser is turned on. In this case, some of the light output generated by the laser is input to a photodetector functioning a monitoring function and the optical signal is converted into an electrical signal. The converted electrical signal is input to the A / D converter and the optical power level is measured. When the measured value does not maintain a constant level, the malfunction detection unit 213 determines that a failure has occurred in the optical signal transceiver. The switch control unit 203 is notified of the fact. The switch control unit 203 then transmits a trigger signal instructing the two switches 201 and 202 to switch.

On the other hand, the physical connection unit 241 is composed of one or more connection ports that are physically connected to the subscriber terminal 140, through which the Ethernet signal relay device 120 can also provide a service performed by the lower Ethernet switch 130. .

Meanwhile, the Ethernet signal relay 120 may further include an overload detector 222 for detecting whether the CPU processor provided in the Ethernet signal processor 221 is overloaded.

However, the present invention can be applied to a passive optical network (PON) in addition to a communication network based on an Ethernet switch. The reason for this is as follows. PON technology has the same structure as a communication network based on an Ethernet switch when implemented in practice. In the case of the PON network, the subscriber function Ethernet switch function is provided with an optical node unit (ONU). The ONU differs only from subscriber-capable Ethernet switches in that it uses an optical transceiver for PON as the physical optical transceiver. Accordingly, the ONU can be connected in multiple stages as the Ethernet switch for subscribers, and the problem of communication failure can be overcome according to the present invention. Therefore, the Ethernet signal relay 120 according to the present invention can be applied not only to the subscriber acceptance Ethernet switch but also to the ONU.

Next, a method of driving the Ethernet signal relay 120 according to the present invention will be described. 3 is a flowchart illustrating a method of driving an Ethernet signal relay device according to an exemplary embodiment of the present invention. A description with reference to FIG. 3 is as follows.

The Ethernet signal relay 120 normally transmits the optical signal transmitted from the aggregation Ethernet switch 110 to the first optical signal transceiver 211 through the first switch 201 (S300). Subsequently, the transmitted optical signal is reproduced as an electrical signal after the photoelectric conversion process in the Ethernet signal converter 231 (S310), and the reproduced electrical signal is a subscriber station 140 as a destination through the Ethernet signal processor 221. In step S325, the data packet is delivered. Alternatively, the reproduced electrical signal is converted into an optical signal having an Ethernet data format again through the Ethernet signal converter 231, and then sequentially passed through the second optical signal transceiver 212, the second switch 202, and the like. The data packet is transmitted to the lower Ethernet switch 130 (S330).

The latter data packet may aggregate other packets by the lower Ethernet switch 130 while the Ethernet signal processing unit 221 progresses toward the lower Ethernet switch 130. Therefore, it is preferable that the latter data packet maintains the Ethernet data format so that the Ethernet signal converter 231 can recover the clock appropriately for the communication protocol.

On the other hand, if a failure or malfunction of the optical signal transmission / reception unit 211 or 212 is detected through the functional failure detection unit 213 (S305), a communication failure occurs, causing inconvenience to the service user. In addition, the same situation as above occurs when the CPU processor included in the Ethernet signal processor 221 is placed in an overloaded state (S320).

Therefore, in this case, the switch control unit 203 generates a switch switching trigger signal (S315), and thus the optical signal received from the aggregation Ethernet switch 110 passes only the two switches 201 and 202 in turn and then lowers. It is transmitted to the Ethernet switch 130 (S335).

According to the above, even if an emergency situation occurs in the Ethernet signal relay device 120 does not cause a communication failure, it is possible to increase the reliability of the communication service to the subscriber.

4 shows an example in which the optical coupler 401 is applied instead of the first switch 201. The optical coupler 401 branches the optical signal received by the Ethernet signal relay 120 and then transmits the branched optical signal to the first optical signal transceiver 211 and the second switch 202, respectively. Since the optical coupler 401 according to the present invention serves as an optical signal distributor for distributing optical signals, it may be replaced by another device having such a function.

When the Ethernet signal relay 120 operates normally, since the second switch 202 is connected to the second optical signal transceiver 212, the optical signal branched from the optical coupler 401 is transmitted to the second switch 202. ) Is not sent. However, when the malfunction detection unit 213 detects an abnormal occurrence of the optical signal transmission / reception unit 211 or 212 or when the CPU processor provided in the Ethernet signal processing unit 221 is overloaded, the switch control unit 203 switches the switch. The connection state of the second switch 202 is changed by the trigger signal. Accordingly, since the optical signal transmitted by the concentrating Ethernet switch 110 will be transmitted to the lower Ethernet switch 130 via the optical coupler 401 and the second switch 202, a communication failure does not occur.

Meanwhile, the first switch 201 and the second switch 202 according to the present invention may be implemented as 1x2 or 2x2 as a switch type switch. Hereinafter, referring to FIG. 5, the two switches 201 and 202 will be implemented in a 2 × 2 form. In the following description, the switch-type switch 500 refers to the first switch 201 and the second switch 202.

The transfer switch 500 may include a first port 511 and a first optical signal transceiver 211 connected to the aggregation Ethernet switch 110 or the lower Ethernet switch 130 as shown in FIG. Or a second port 512 connected to the second optical signal transceiver 212, a third port 513 connected to another switch, and the like. The fourth port 514 provided in the switch type switch 500 is normally opened without being connected, and terminated using an element such as an optical attenuator or an optical isolator to minimize crosstalk of the switch.

In addition, the switch-type switch 500 is also electrically connected to the switch control unit 203, and according to the command of the switch control unit 203, the bar state (see (b) of FIG. 5) or the cross state ( 5 (c)) or vice versa.

The switch controller 203 according to the present invention determines whether an abnormality of the optical signal transceiver 211 or 212 occurs or the CPU process is overloaded according to the processing result of the function failure detector 213 and the Ethernet signal processor 221. The switch control unit 203 generates a switch control signal based on the determination result. Accordingly, the switch type switch 500 is switched from the bar state to the cross state. When the switch-type switch 500 is changed from the bar state to the cross state, the optical signal is transmitted from the first switch 201 to the second switch 202 to overcome the communication obstacle.

The above description is merely illustrative of the technical spirit of the present invention, and those skilled in the art to which the present invention pertains various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

The present invention can be applied to a passive optical subscriber network (PON) in addition to a communication network based on an Ethernet switch. In the case of PON technology, E-PON (Ethernet-PON) technology, which utilizes Ethernet technology, which is a short-range network communication technology that is widely used in Internet communication networks, is applied to FTTH network construction in Asia, and time division multiplexing technology. G-bit-capable PON (G-PON) technology is also being commercialized in North America and Europe after international standardization. In view of the above, it is expected that the present invention is very likely to be used in a market for providing high-speed Internet service to subscribers, and thus, it is expected to contribute to industrial development in the future.

1 is a conceptual diagram of an Ethernet switch-based communication network system according to a preferred embodiment of the present invention;

2 is a conceptual diagram of an Ethernet signal relay device according to a preferred embodiment of the present invention;

3 is a flowchart illustrating a method of driving an Ethernet signal relay device according to an embodiment of the present invention;

4 is an exemplary diagram in which an optical coupler is applied to an Ethernet signal relay device according to a preferred embodiment of the present invention;

5 is an exemplary configuration diagram of a switch according to a preferred embodiment of the present invention.

100: Ethernet switch based communication network system

110: aggregation Ethernet switch 120: Ethernet signal relay device

130: lower Ethernet switch 140: subscriber terminal

200: Ethernet signal switching unit 201, 202: switch

203: switch control unit 211, 212: optical signal transceiver

213: functional failure detection unit 221: Ethernet signal processing unit

222: overload detection unit 231: Ethernet signal conversion unit

241 physical connection 401 optical coupler

Claims

The Ethernet signal is transmitted from the outside to the upper Ethernet signal transmitter for transmitting the Ethernet signal to the lower Ethernet signal transmitter dependent on the user terminal or itself, and is received from the outside when a failure is detected in the upper Ethernet signal transmitter. Ethernet signal switching unit for directly transmitting the Ethernet signal to the lower Ethernet signal transmitter

Ethernet signal relay device comprising a.

The method of claim 1,

A malfunction detection unit for detecting whether a malfunction occurs in the upper Ethernet signal transmission unit; or

An overload detector for detecting whether the upper Ethernet signal transmitter is overloaded

Ethernet signal relay device further comprising.

The method of claim 1,

An Ethernet signal transceiver for transmitting an Ethernet signal received from the outside to the lower Ethernet signal transmitter; And

Ethernet signal processing unit for transmitting the electrical signal to the user terminal when the Ethernet signal received from the Ethernet signal transmission and reception unit is converted into an electrical signal containing a data packet

Ethernet signal relay device further comprising.

The method of claim 1,

The Ethernet signal switching unit,

A first switch configured to receive the Ethernet signal from the outside and to transmit the received Ethernet signal to the upper Ethernet signal transmitter;

A second switch for transmitting the Ethernet signal received from the upper Ethernet signal transmitter to the lower Ethernet signal transmitter; And

When a failure is detected in the upper Ethernet signal transmitter, a switch controller for directly receiving the Ethernet signal received from the outside from the first switch.

Ethernet signal relay device comprising a.

The method of claim 2,

And the functional failure detecting unit determines that the upper Ethernet signal transmitting unit is in a malfunction state when the output level of the Ethernet signal received by the upper Ethernet signal transmitting unit is lower than a predetermined level.

The method of claim 4, wherein

The first switch is an Ethernet signal relay device comprising a switch for distributing Ethernet signals received from the outside or a switch-type switch in which interconnected ports are changed under the control of the switch controller.

The method of claim 1,

And the upper Ethernet signal transmitter and the lower Ethernet signal transmitter are an Ethernet switch or an optical node unit.

A user terminal which is a means for connecting a user;

A lower ethernet signal transmitter for directly exchanging traffic with the user terminal; And

The Ethernet signal received from the outside is transmitted to an upper Ethernet signal transmitter that transmits an Ethernet signal to the lower Ethernet signal transmitter dependent on the user terminal or itself, and when the failure is detected in the upper Ethernet signal transmitter, Ethernet signal relay device for directly transmitting the received Ethernet signal to the lower Ethernet signal transmitter

Ethernet-based communication network system comprising a.

The method of claim 8,

The Ethernet signal relay device,

Ethernet-based communication network system further comprising.

The method of claim 8,

The Ethernet signal relay device,

Ethernet-based communication network system further comprising.

The method of claim 8,

The Ethernet signal relay device,

Ethernet-based communication network system comprising a.

(a) transmitting the ethernet signal received from the outside to an upper ethernet signal transmitter for transmitting an ethernet signal to a lower ethernet signal transmitter dependent on a user terminal or itself, and determining whether a failure is detected in the upper ethernet signal transmitter; Doing; And

(b) if a failure is detected in the upper Ethernet signal transmitter, recovering a communication failure by directly transmitting the Ethernet signal received from the outside to the lower Ethernet signal transmitter;

Method for recovering a communication failure using an Ethernet signal relay device comprising a.

The method of claim 12,

In the step (a), it is detected whether a function failure occurs in the upper Ethernet signal transmitter or whether the upper Ethernet signal transmitter is overloaded or not, thereby determining whether a failure is detected in the upper Ethernet signal transmitter. To recover from a communication failure by using an Ethernet signal relay device.

The method of claim 13,

In the step (a), when the output level of the Ethernet signal received by the upper Ethernet signal transmitter is lower than a predetermined level, the failure of the communication using the Ethernet signal relay device, characterized in that it is determined that a malfunction has occurred in the upper Ethernet signal transmitter. How to recover.

The method of claim 12,

In the step (b), the second switch for transmitting the Ethernet signal received from the upper Ethernet signal transmitter to the lower Ethernet signal transmitter receives the Ethernet signal from the outside and transmits the received Ethernet signal to the upper Ethernet signal. Method for recovering a communication failure using an Ethernet signal relay device, characterized in that directly receiving the Ethernet signal received from the outside from the first switch to the negative.