KR100912813B1 - Apparatus for transferring disorder between Ethernet network and SDH network and method thereof - Google Patents

Abstract

The present invention discloses an apparatus and method for transmitting fault information between an Ethernet network and an SDH network.

According to the present invention, in the case of the conventional EoS network, Ethernet network and SDH network are logically separated to solve the disadvantage of not being able to transmit OAM frames. In the interworking part of, the OAM information is transmitted to the other network using the existing MAC control frame to provide an effective operation / management for the EoS network. In addition, by using the MAC control frame defined in the standardization has the advantage that it can be applied to a conventional system without a separate hardware change or a separate definition for a new OAM frame.

Description

Apparatus for transferring disorder between Ethernet network and SDH network and method

TECHNICAL FIELD The present invention relates to communication, and more particularly, to an apparatus and method for transmitting fault information in a communication system.

More specifically, the present invention relates to an Ethernet over SDH (EoS) system for transmitting an Ethernet packet through a synchronous digital hierarchy (SDH) network, and more specifically, an EoS system. Relates to transmission of fault information in.

The present invention is derived from the research conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management Number: 2005-S-101-02, Title: Development of Multimedia QoS Routing Technology] .

The conventional EoS system has a disadvantage in that when an Ethernet network or an SDH network is logically separated from each other, when a failure occurs in the Ethernet network or the SDH network, the EoS system cannot be transferred to another network. That is, in case of transmission using the SDH network to ensure the quality and performance of the Ethernet packet, when the SDH network fails, the failure is handled according to the protection / recovery function of the existing SDH network.

However, in this case, since the fault information generated in the SDH network is not transmitted to the Ethernet network, the fault handling in the linkage with the Ethernet network cannot be performed. Therefore, it cannot perform the protection / recovery function for the entire EoS system. Therefore, the performance of the Ethernet packet cannot be guaranteed and effective network management is difficult.

The technical problem to be achieved by the present invention, in order to solve the above problems, when a failure occurs in the Ethernet network or SDH network between the Ethernet network and SDH network using the corresponding failure information in the linkage between the Ethernet network and the SDH network. The present invention provides an apparatus and method for transmitting fault information between an Ethernet network and an SDH network that can provide interoperability with fault information and can be applied to a conventional system without a separate hardware change or definition of a new OAM frame.

Another technical problem to be solved by the present invention is to provide a computer-readable recording medium recording the above method.

In order to solve the above technical problem, an apparatus for transmitting error information between an Ethernet network and an SDH network includes an Ethernet network and an Ethernet network in an Ethernet over SDH (EoS) network that transmits Ethernet packets using a SDH (Synchronous Digital Hierarchy) network. An apparatus for transmitting fault information between SDH networks, the apparatus comprising: a frame transceiver configured to transmit and receive Ethernet frames through a plurality of optical transmission and reception ports, and detect a failure of a physical link; Reads the header information of the Ethernet frame received by the frame transceiver, detects the OAM frame, detects the state information for each port, and generates the OAM frame using the port or flow state information to generate the Ethernet through the frame transceiver. MAC processing unit for transmitting to the network; An SDH processor configured to receive state and failure information of the Ethernet network and generate an SDH OAM frame corresponding thereto; An output interface unit receiving the frame generated by the SDH processing unit and outputting the frame to the SDH network; And receiving the fault information detected by the frame transceiver and generating an OAM signal corresponding thereto, and transmitting status and fault information of the network for generating SDH OAM frame generation information from the OAM frame generated by the MAC processor to the SDH processor. Characterized in that it comprises a;

According to the present invention for solving the other technical problem, a method for transmitting fault information in the SDH network to the Ethernet network, Ethernet over SDH (EoS) network for transmitting the Ethernet packet using a Synchronous Digital Hierarchy (SDH) network A method for transmitting a fault in an SDH network to an Ethernet network, the method comprising: (a) monitoring an SDH OAM frame by monitoring an SDH frame input for each port of the SDH network input; (b) determining whether failure information of the SDH network included in the frame is detected when the SDH OAM frame is detected; And (c) if there is a failure information, stops transmission of a normal data frame, and transmits OAM information corresponding to the failure to an OAM type area located in a MAC control parameter area according to the format of a MAC control frame. And inserting the and values into the OAM data region to generate an Ethernet OAM frame and transmitting the generated Ethernet OAM frame to the Ethernet network.

In another aspect of the present invention, there is provided a method for transmitting fault information in an Ethernet network to an SDH network by using an Ethernet over SDH (EoS) for transmitting an Ethernet packet using a Synchronous Digital Hierarchy (SDH) network. In the network, a method for notifying a failure in the Ethernet network to the SDH network, comprising the steps of: monitoring the presence of the Ethernet OAM frame by monitoring the Ethernet frame input for each port of the Ethernet network input; Determining the presence or absence of failure information of the Ethernet network included in the Ethernet OAM frame when the Ethernet OAM frame is detected; And if there is failure information in the Ethernet OAM frame, stops transmission of a normal data frame, generates an SDH OAM frame having information corresponding to the failure information, there is no failure information in the Ethernet OAM frame, and network connectivity information or performance. If there is information, inserting the network connectivity response or corresponding performance information into the SDH OAM frame to generate an SDH OAM frame and transmitting it to the SDH network.

According to the present invention for solving the above technical problem, a computer-readable recording medium recording a method for transmitting fault information in an SDH network to an Ethernet network uses an SDH (Synchronous Digital Hierarchy) network. In a computer-readable recording medium recording a method of transmitting a fault in an SDH network to an Ethernet network in an EoS (Ethernet over SDH) network to transmit the data, the method comprises: (a) SDH input for each port of the SDH network input. Monitoring the frame to monitor the presence or absence of an SDH OAM frame; (b) determining whether failure information of the SDH network included in the frame is detected when the SDH OAM frame is detected; And (c) if there is a failure information, stops transmission of a normal data frame, and transmits OAM information corresponding to the failure to an OAM type area located in a MAC control parameter area according to the format of a MAC control frame. And inserting the and values into the OAM data region to generate an Ethernet OAM frame and transmitting the generated Ethernet OAM frame to the Ethernet network.

According to the present invention for solving the above technical problem, a computer-readable recording medium recording a method of transmitting fault information in an Ethernet network to an SDH network uses an SDH (Synchronous Digital Hierarchy) network. In a computer-readable recording medium recording a method of notifying a fault in an Ethernet network to an SDH network in an EoS (Ethernet over SDH) network to transmit the data, the Ethernet frame inputted by each port of the Ethernet network input is monitored. Monitoring whether there is an Ethernet OAM frame; Determining the presence or absence of failure information of the Ethernet network included in the Ethernet OAM frame when the Ethernet OAM frame is detected; And if there is failure information in the Ethernet OAM frame, stops transmission of a normal data frame, generates an SDH OAM frame having information corresponding to the failure information, there is no failure information in the Ethernet OAM frame, and network connectivity information or performance. If there is information, inserting the network connectivity response or corresponding performance information into the SDH OAM frame to generate an SDH OAM frame and transmitting it to the SDH network.

According to the present invention, the conventional EoS network is designed to solve the disadvantage that the OAM frame cannot be transmitted because the Ethernet network and the SDH network are logically separated, and when the Ethernet network or the SDH network fails, the Ethernet network and the SDH network In the interworking part of, the OAM information is transmitted to the other network using the existing MAC control frame to provide an effective operation / management for the EoS network. In addition, by using the MAC control frame defined in the standardization has the advantage that it can be applied to a conventional system without a separate hardware change or a separate definition for a new OAM frame.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an example of a configuration of an OAM frame transmission apparatus for interworking an Ethernet network and an SDH network according to the present invention.

This device which transmits fault information between Ethernet network and SDH network in EoS network that transmits Ethernet packet using SDH network, transmits and receives Ethernet frame through multiple optical transmission / reception ports, and transmits / receives frame that detects failure of physical link. Part 10, reads the header information of the Ethernet frame received by the frame transceiver unit 10 to detect the OAM frame, to detect the status information for each port, and to generate the OAM frame using the port or flow status information MAC processing unit 20 for transmitting to the Ethernet network through the frame transmission and reception unit 10, SDH processing unit 30 for receiving the status and failure information for the Ethernet network to generate an SDH OAM frame corresponding thereto, SDH processing unit ( Output interface unit 40 for receiving the frame generated in 30) and output to the SDH network, and delivers the SDH frame received from the SDH network to the SDH processing unit 30 Receives the failure information detected by the input interface unit 50 and the frame transceiver unit 10 and generates an OAM signal corresponding thereto, and generates SDH OAM frame generation information from the OAM frame generated by the MAC processing unit 20. It includes a signal processing unit 60 for transmitting the status and fault information of the network to the SDH processing unit 30.

At this time, the MAC processing unit 20 reads the header information of the Ethernet frame received by the frame transmitting and receiving unit 10 to detect the OAM frame and transfers the port-specific statistical information and port status information to the signal processing unit 60.

At this time, the format of the detected OAM frame follows the format of the standard MAC control frame.

The MAC processing unit 20 separates the Ethernet frame input from the frame transmitting and receiving unit 10 by using the MAC header information and transfers the Ethernet frame to the corresponding virtual container.

The SDH processing unit 30 converts the Ethernet packet input from the MAC processing unit 20 into an SDH frame and transfers it to the corresponding virtual box. In addition, the SDH processing unit 30 pulls out an Ethernet packet from the SDH frame inputted from the SDH network and outputs it to the MAC processing unit 20. The SDH processor 30 receives the failure information from the signal processor 60 and generates an SDH OAM frame.

The format of the generated SDH OAM frame follows the format of the standard MAC control frame, and when a failure occurs in the SDH network or the Ethernet network, OAM information corresponding to the failure is included in the MAC control parameter area according to the format of the MAC control frame. In the OAM type field located at, insert information and values related to the fault into the OAM data area. This will be explained in detail again in the following description.

The output interface unit 40 outputs the SDH frame input from the SDH processing unit 30 to the SDH network.

The input interface unit 50 receives the fault signal of the SDH network and transmits the fault signal to the signal processor 60, and the signal processor 60 receives the fault signal as an input and generates an OAM signal corresponding thereto.

In addition, the signal processor 60 controls the output interface 40 to output data to the SDH network, and stores and manages the results processed by the MAC processor 20 and the SDH processor 30.

The frame transceiver 10 detects a loss of signal (LOS) by measuring the intensity of the optical signal input from the Ethernet network.

2A to 2D are exemplary diagrams for propagating an OAM signal including information on the failure when a failure occurs in the SDH network to which the present invention is applied.

FIG. 2A illustrates a structure in which an Ethernet network and an SDH network 300 are connected. As shown in the figure, the Ethernet network and the SDH network 300 are connected to the Ethernet / SDH interface 100-1, and the Ethernet network and the SDH network 300 are connected to the Ethernet / SDH interface 100-2. Both Ethernet / SDH interfaces 100-1 and 100-2 are connected to the same SDH network 300. As such, the structure in which the Ethernet network and the SDH network are connected is the same in FIGS. 2A to 2D.

The fault information transmission apparatus between the Ethernet network and the SDH network of FIG. 1 according to the present invention operates by being located inside the Ethernet / SDH interfaces 100-1 and 100-2 of FIG. 2.

In FIG. 2B, when a failure occurs in the SDH network 300, the node detecting the failure transmits an Alarm Indication Signal (AIS) signal in a downstream direction.

When the AIS signal is input to the Ethernet / SDH interface 100-1 in the downward direction, the Ethernet / SDH interface 100-1 transmits the OAM frame according to the present invention to the Ethernet network connected thereto, and the opposite Ethernet / SDH interface In step 100-2, an RDI (Remote Defect Indication) signal is transmitted through the SDH network 300 (FIG. 2C).

The upstream Ethernet / SDH interface 100-2 receiving the RDI signal transmits an OAM frame defined in accordance with the present invention to an Ethernet network connected thereto (FIG. 2D). This OAM frame according to the present invention will be described in detail again below.

3A to 3D are exemplary diagrams for propagating an OAM signal including failure information when a failure occurs in an Ethernet network to which the present invention is applied. At this time, the connection structure between the Ethernet network and the SDH network of FIGS. 3A to 3D is substantially the same as that of FIGS. 2A to 2D.

Also, as in FIGS. 2A to 2D, the apparatus for transmitting fault information between the Ethernet network and the SDH network of FIG. 1 according to the present invention is located inside the Ethernet / SDH interfaces 100-1 and 100-2 of FIGS. 3A to 3D. To work.

FIG. 3a illustrates a structure in which an Ethernet network and an SDH network are connected. FIG. As shown in the figure, an Ethernet network and an SDH network are connected to the Ethernet / SDH interface 100-1, an Ethernet network and an SDH network are connected to the Ethernet / SDH interface 100-2, and two Ethernet / SDH interfaces ( 100-1 and 100-2) are connected to the same SDH network. As such, the structure in which the Ethernet network and the SDH network are connected to each other is the same in FIGS. 3A to 3D.

In FIG. 3B, when a failure occurs in an Ethernet network connected to the Ethernet / SDH interface 100-1, the node detecting the failure transmits an OAM frame according to the present invention in an upward direction. When the OAM frame is input to the Ethernet / SDH interface 100-1 located in the upward direction, the Ethernet / SDH interface 100-1 is an OAM according to the present invention as an Ethernet network in a downward direction corresponding to the port where the OAM frame is input. The frame is transmitted and the RDI (Remote Defect Indication) signal is transmitted through the SDH network to the opposite Ethernet / SDH interface 100-2 (FIG. 3C).

Receiving the RDI signal, the uplink Ethernet / SDH interface 100-2 transmits the OAM frame according to the present invention to the Ethernet network connected thereto (FIG. 3D).

4A and 4B are exemplary diagrams illustrating a frame specification and a form for transmitting OAM information including failure information according to the present invention.

As shown in FIG. 4A, the OAM frame has a fixed length of 64 bytes and follows the standard of the MAC control frame defined in IEEE 802.3. 6 bytes of destination address 400, 6 bytes of source address 410, 2 bytes of Ethernet type 420, 2 bytes of MAC control opcode 430, 44 bytes of MAC control parameter 440 and reserved area 450 and FCS ( 460) 4 bytes.

The MAC control parameter field 440 is composed of version information 442 of the OAM frame, the OAM type 444 and the OAM data 446.

If a failure occurs in the SDH network or the Ethernet network, the corresponding OAM information is inserted into the OAM type area 444 located in the MAC control parameter area 440, and then the relevant information and values are inserted into the OAM data area 446. Send to neighbor node.

In one embodiment of the present invention, the Ethernet type value 420 uses 0x8808 indicating a MAC control frame, and the MAC control opcode 430 is set to 0x0002.

An example of an OAM form according to the present invention is shown in FIG. 4B. The main performance information is defined as LOF (Loss of Frame), Delay, Jitter, and the value of each performance information is inserted into OAM data and transmitted to the adjacent node.

5 is an embodiment illustrating a flow of an OAM frame generation operation for propagating an Ethernet network when a failure occurs in the SDH network according to the present invention.

In step S501 to monitor the SDH frame input for each port in order to detect the failure of the SDH network. When the SDH OAM frame is input in step S502, it is transmitted to the signal processor (reference numeral 60 of FIG. 1).

The signal processing unit decodes the SDH OAM frame transmitted in step S502 (step S503). In step S504, it is determined whether or not there is failure information as a result of decoding the SDH OAM frame. If there is failure information in the SDH OAM frame, transmission of the normal data frame is stopped (step S505), and an Ethernet OAM frame having corresponding failure information is generated (step S506).

If there is no failure information in the SDH OAM frame and there is network connectivity information or performance information in step S504, a network connectivity response or corresponding performance information is inserted into the Ethernet OAM frame (step S506). At this time, the Ethernet OAM frame form has the frame form of FIG. 4.

In step S507, when the SDH OAM frame is input, the Ethernet OAM frame is output, otherwise the normal data frame is output.

FIG. 6 is a diagram illustrating an operation of generating an OAM frame for propagating an Ethernet network to an SDH network when a failure occurs in the Ethernet network according to the present invention.

In step S601 to monitor the Ethernet frame input for each port to detect the failure of the Ethernet network. When the Ethernet OAM frame is input in step S602, it is transmitted to the signal processor (reference numeral 60 of FIG. 1).

The signal processing unit decodes the Ethernet OAM frame transmitted in step S602 (step S603). In step S604, it is determined whether or not there is failure information as a result of decoding the Ethernet OAM frame. If there is failure information in the Ethernet OAM frame, transmission of the normal data frame is stopped (step S605), and an SDH OAM frame having corresponding failure information is generated (step S606).

If there is no failure information in the Ethernet OAM frame and there is network connectivity information or performance information in step S604, a network connectivity response or corresponding performance information is inserted into the SDH OAM frame (step S606). In this case, the SDH OAM frame form has a conventional SDH OAM frame form and includes an Ethernet OAM frame having the frame form of FIG. 4 in the payload.

In step S607, when the Ethernet OAM frame is input, the SDH OAM frame is output. Otherwise, the normal data frame is output.

As in the embodiment of the present invention described above, the present invention has proposed a new Ethernet OAM frame using an existing MAC control frame to transfer fault information between the Ethernet network and the SDH network.

That is, the present invention provides an interoperability for OAM information between the Ethernet network and the SDH network by using an existing MAC control frame in generating an OAM frame for transmitting an error generated in the SDH network to the Ethernet network. In addition, by using a MAC control frame, a method that can be applied to a conventional system without a separate hardware change or a separate definition of a new OAM frame is presented.

Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. Examples included in the above description are introduced for the understanding of the present invention, and these examples do not limit the spirit and scope of the present invention. It will be apparent to those skilled in the art that various embodiments in accordance with the present invention in addition to the above examples are possible. The scope of the present invention is shown not in the above description but in the claims, and all differences within the scope will be construed as being included in the present invention.

In addition, it can be easily understood by those skilled in the art that each of the above steps according to the present invention can be variously implemented in software or hardware using a general programming technique.

And some steps of the invention may also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, CD-RW, magnetic tape, floppy disks, HDDs, optical disks, magneto-optical storage devices, and carrier wave (eg, Internet It also includes the implementation in the form of). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The present invention can be used to solve a communication failure.

1 is a block diagram illustrating an example of a configuration of an OAM frame transmission apparatus for interworking an Ethernet network and an SDH network according to the present invention.

2A to 2D are exemplary diagrams for propagating OAM signals when a failure occurs in the SDH network to which the present invention is applied.

3A to 3D are exemplary diagrams for propagating OAM signals when a failure occurs in an Ethernet network to which the present invention is applied.

4A and 4B are exemplary diagrams illustrating a frame specification and a form for transmitting OAM information including failure information according to the present invention.

FIG. 5 is a diagram illustrating an operation of generating an OAM frame for propagating an Ethernet network when a failure occurs in the SDH network according to the present invention.

Figure 6 is an embodiment showing the flow of the OAM frame generation operation for propagating this to the SDH network when a failure occurs in the Ethernet network according to the present invention.

Claims (17)

In an apparatus for transmitting fault information between an Ethernet network and an SDH network in an Ethernet over SDH (EoS) network that transmits an Ethernet packet using a synchronous digital hierarchy (SDH) network, A frame transceiver for transmitting and receiving an Ethernet frame through a plurality of optical transmission and reception ports, and detecting a failure of a physical link; Reads the header information of the Ethernet frame received by the frame transceiver, detects the OAM frame, detects the state information for each port, and generates the OAM frame using the port or flow state information to generate the Ethernet through the frame transceiver. MAC processing unit for transmitting to the network; An SDH processor configured to receive state and failure information of the Ethernet network and generate an SDH OAM frame corresponding thereto; An output interface unit receiving the frame generated by the SDH processing unit and outputting the frame to the SDH network; And Receives the failure information detected by the frame transceiver and generates an OAM signal corresponding thereto, and transmits network status and failure information for generating SDH OAM frame generation information from the OAM frame generated by the MAC processor to the SDH processor. Signal processing unit for; fault information transmission apparatus between the Ethernet network and the SDH network comprising a. The method of claim 1, The MAC processor reads the header information of the Ethernet frame received by the frame transceiver, detects an OAM frame, and transfers port-specific statistical information and port status information to the signal processor. Fault information transmission device. The method of claim 2, The format of the detected OAM frame is an apparatus for transmitting error information between an Ethernet network and an SDH network, according to a format of a MAC control frame. The method of claim 2, And the MAC processing unit separates the Ethernet frame input from the frame transceiver unit using MAC header information, and transfers the Ethernet frame to a virtual container corresponding thereto, and transmits the failure information between the Ethernet network and the SDH network. The method of claim 1, The SDH processing unit converts the Ethernet packet inputted from the MAC processing unit into an SDH frame and transmits the fault information between the Ethernet network and the SDH network, characterized in that for transmitting the corresponding virtual box. The method of claim 5, And the SDH processing unit extracts an Ethernet packet from an SDH frame inputted from the SDH network and outputs the Ethernet packet to the MAC processing unit. The method of claim 1, The SDH processing unit receives fault information from the signal processor and generates an SDH OAM frame, characterized in that the fault information transmission apparatus between the Ethernet network and the SDH network. The method of claim 7, wherein The generated SDH OAM frame is an SDH OAM frame format comprising an Ethernet OAM frame having a payload MAC control frame format in a payload. The method of claim 2, And the output interface unit outputs the SDH frame input from the SDH processing unit to the SDH network. The method of claim 1, Input interface unit for transmitting the SDH frame received from the SDH network to the SDH processing unit; further comprising a failure information transmission device between the Ethernet network and SDH network. The method of claim 10, The input interface unit receives the fault information of the SDH network and transmits the fault information to the signal processor, and the signal processor generates the OAM signal corresponding to the fault information as an input, and the fault information between the Ethernet network and the SDH network. Transmission device. The method of claim 1, And the signal processor controls the output interface unit to output data to the SDH network. The method of claim 1, And the signal processor stores and manages the results processed by the MAC processor and the SDH processor. The method of claim 1, And the frame transceiver detects a loss of an optical signal by measuring an intensity of an optical signal input from the Ethernet network. In a method of transmitting an error in an SDH network to an Ethernet network in an Ethernet over SDH (EoS) network that transmits an Ethernet packet using a synchronous digital hierarchy (SDH) network, (a) monitoring the presence or absence of an SDH OAM frame by monitoring an SDH frame input for each port of the SDH network input; (b) determining whether failure information of the SDH network included in the frame is detected when the SDH OAM frame is detected; And (c) If there is a failure information, the transmission of the normal data frame is stopped, and the OAM information corresponding to the failure is stored in the OAM type area located in the MAC control parameter area according to the format of the MAC control frame. And inserting a value into an OAM data area to generate an Ethernet OAM frame and transmitting the generated Ethernet OAM frame to the Ethernet network. The method of claim 15, If there is no failure information in the SDH OAM frame detected in step (b) and there is network connectivity information or performance information, in step (c), the network connectivity response or corresponding performance information is inserted into the Ethernet OAM frame to insert the Ethernet OAM frame. Method for transmitting fault information in the SDH network to the Ethernet network, characterized in that for generating and transmitting to the Ethernet network. In an Ethernet over SDH (EoS) network in which Ethernet packets are transmitted using a synchronous digital hierarchy (SDH) network, a method of notifying a failure in an Ethernet network to an SDH network, Monitoring an Ethernet OAM frame by monitoring an Ethernet frame input for each port of the Ethernet network input; Determining the presence or absence of failure information of the Ethernet network included in the Ethernet OAM frame when the Ethernet OAM frame is detected; And If there is failure information in the Ethernet OAM frame, transmission of the normal data frame is stopped, and an SDH OAM frame having information corresponding to the failure information is generated, and there is no failure information in the Ethernet OAM frame and no network connectivity information or performance information. If there is, inserting the network connectivity response or corresponding performance information into the SDH OAM frame to generate the SDH OAM frame and transmitting to the SDH network; characterized in that the failure information in the Ethernet network comprising a SDH network How to transfer.

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