KR100757899B1 - Method for sending maintenance signal between multi-layers in eos transmission device - Google Patents

Abstract

A maintenance signal delivery method among multiple layers in an EoS(Ethernet over SONET/SDH) transmission device is provided to define relations among maintenance signals which are independently generated from an Ethernet layer and SONET/SDH(Synchronous Optical Network/Synchronous Digital Hierarchy) layers, so as to deliver the maintenance signals quickly among the layers to ensure signal continuity. Mutual conversion relations among maintenance signals of SONET/SDH layers(31), a maintenance signal of an EoS adaptive layer(32), and a maintenance signal of an Ethernet layer(33) are previously defined. The maintenance signals which are independently generated at the layers(31-33) are mutually converted by using the defined conversion relations, and the converted signals are mutually delivered to the respective layers.

Description

Method for sending maintenance signal between multi-layers in EOS transmission device}

1 is a flowchart illustrating a maintenance signal transmission in a conventional EOS transmitter;

2 is a schematic configuration diagram of an EOS transmission apparatus to which the present invention is applied;

3 is a logical hierarchy between multiple layers according to the present invention, and

4 is a flowchart illustrating a process of transmitting a maintenance signal between multiple layers in an EOS transmission apparatus according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: EOS transmission device

112, 502: SONET / SDH signal matching layer

114, 503: EOS adaptation layer

114, 504: Ethernet frame transfer unit

130, 501: OAM control software section

21: operation signal input and output terminal

22: spare signal input and output terminals

The present invention relates to a method for transmitting maintenance signals between multiple layers in an EOS (Ethernet over SONET / SDH) transmission apparatus, and more particularly, to a Next Generation-Synchronous Digital Hierarchy (NG-SDH) switching system. The present invention relates to a maintenance signal transmission method between multiple layers in an EOS transmission apparatus that defines a relationship between maintenance signals independently generated in a plurality of layers in an EOS transmission apparatus and transmits a maintenance signal between the layers.

In general, when a failure is detected in the signal transmission device, the maintenance signal is transmitted in the upper direction and the lower direction to perform the maintenance management function for the transmission signal. It is delivered in hardware according to the maintenance signaling system defined in.

Since the EOS transmitter has a wide bandwidth and can perform fast data transfer, the function of transmitting the signal status is an important factor in determining the service quality of the EOS transmitter and is an essential function of ensuring signal continuity.

Existing EOS transmitter has a multi-layer structure of Synchronous Optical Network / Synchronous Digital Hierarchy (SONET / SDH) layer, EOS adaptation layer and Ethernet layer. For signals, maintenance signals are managed only within each layer, and there is no transmission system for maintenance signals between the two layers. In this case, fault and maintenance signals generated at the SONET / SDH layer and the Ethernet layer are measured independently by layers by OAM (Operation And Management) control software and notified to each operating system. Therefore, the system operator may cause confusion in determining the correct state of the input / output signal due to the divided maintenance measurement signal for one input / output signal, which may occur in one EOS transmission device having a multi-layer structure. Can lead to an increase in the number of maintenance signals present.

1 is a flowchart illustrating a maintenance signal transmission in a conventional EOS transmission apparatus.

Referring to FIG. 1, the OAM control software unit 101 which controls and manages an EOS transmission apparatus includes a SONET / SDH signal matching layer unit 102, an EOS adaptation layer unit 103, and the like according to an operation S111 of a periodic monitoring timer. In order to periodically monitor the status of the Ethernet frame transfer unit 104, a maintenance signal detection of the SONET / SDH layer, a maintenance signal detection of the EOS adaptation layer, and a maintenance signal detection of the Ethernet layer are required (S112 and S113), respectively. S114). The OAM control software unit 101 may be implemented in software or may be implemented in hardware. Then, the OAM control software unit 101 receives the maintenance signal detection response of the SONET / SDH layer, the maintenance signal detection response of the EOS adaptation layer, and the maintenance signal detection response of the Ethernet layer, respectively, for the respective requests ( S115, S116, and S117) detect and collect maintenance signals for each layer. The maintenance signal detected for each layer in this way is managed in the maintenance signal collection and maintenance table (S118), and is transmitted to the operation management system 105 (S119).

In such a conventional EOS transmission apparatus, since maintenance signals for each layer are generated and transmitted independently of each other and transmitted to the operation management system 105, it is inconvenient for the administrator to analyze the connectivity state for each signal. It is impossible to transmit the connection status of the input signal because it cannot transmit maintenance signals generated independently at SONET / SDH layer and EOS adaptation layer to Ethernet layer. If an error occurs in the SONET / SDH layer with respect to one input signal in the EOS transmission device, all of the maintenance signals are generated in each layer, which may cause the operator to confuse the signal state.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems, and it is possible to quickly define a maintenance signal between these layers by predefining a conversion relationship of maintenance signals independently occurring in each layer in an EOS transmission apparatus having a multi-layer structure. The purpose of the present invention is to provide a method for transmitting maintenance signals between multiple layers in an EOS transmitter which reduces the number of maintenance signals and ensures continuity of signals between layers.

The present invention for achieving the above object in the multi-layer maintenance signal transmission method between multiple layers in an EOS (Ethernet over SONET / SDH) transmission apparatus,

A first step of predefining a mutual conversion relationship between a maintenance signal of a SONET / SDH (Synchronous Optical Network / Synchronous Digital Hierarchy) layer, a maintenance signal of an EOS adaptation layer, and a maintenance signal of an Ethernet layer; And a second step of mutually converting maintenance signals generated independently for each layer by using the defined conversion relationship and transferring them between the layers.

In one embodiment of the present invention, the first step is to define the mutual conversion relationship between the maintenance signal of the SONET / SDH layer, the maintenance signal of the EOS adaptation layer and the maintenance signal of the Ethernet layer for each path of the input signal It is preferable.

In one embodiment of the present invention, the delivery method comprises the steps of requesting a maintenance signal detection for the EOS transmission device; Collecting maintenance signals mutually transmitted between the layers; And transmitting the collected maintenance signal to an operation management system.

In one embodiment of the present invention, in the above-mentioned delivery method, it is preferable to transfer a maintenance signal between the layers with respect to one input signal.

In addition, the present invention for achieving the above object in the multi-layer maintenance signal transmission method in an EOS transmission apparatus having a multi-layer structure including a SONET / SDH signal matching layer unit, EOS adaptation layer unit and Ethernet frame transfer unit. ,

A first step of detecting a SONET / SDH maintenance signal from the SONET / SDH signal matching layer unit with respect to an input signal and transmitting the SONET / SDH maintenance signal to the EOS adaptation layer unit; Inserting the transferred SONET / SDH maintenance signal in the EOS adaptation layer unit and detecting the inserted SONET / SDH maintenance signal according to a detection request of the SONET / SDH maintenance signal; A third step of converting the detected SONET / SDH maintenance signal into an Ethernet maintenance signal by using a predefined conversion relationship and transferring the detected SONET / SDH maintenance signal to the Ethernet frame transfer unit; Inserting the forwarded Ethernet maintenance signal by the Ethernet frame forwarding unit; And a fifth step of reporting the SONET / SDH maintenance signal detected in the first and second steps and the converted Ethernet maintenance signal to the operation management system.

In an embodiment of the present disclosure, the first step may further include receiving a request for detecting a maintenance signal for the EOS transmitter.

In an embodiment of the present disclosure, the first step may further include storing the detected SONET / SDH maintenance signal in a predetermined signal management table in the SONET / SDH signal matching layer unit.

In an embodiment of the present disclosure, the second step may further include receiving a detection request of the inserted SONET / SDH maintenance signal.

In an embodiment of the present disclosure, the second step may further include detecting the inserted SONET / SDH maintenance signal by the EOS adaptation layer unit and storing the inserted SONET / SDH maintenance signal in a predetermined signal management table.

In one embodiment of the present invention, in the third step, the mutual conversion relationship between the SONET / SDH maintenance signal and the Ethernet maintenance signal is preferably defined for each path of the input signal and recorded in a predetermined conversion table.

In an embodiment of the present invention, the third step converts a SONET / SDH maintenance signal into an Ethernet maintenance signal for each signal input during the operation of the EOS transmitter, and converts the history of the conversion into a predetermined history table. It is desirable to store.

In an embodiment of the present invention, the fifth step may report one selected from a plurality of maintenance signals generated for each layer to one input signal to the operation management system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

2 is a system configuration diagram of an EOS transmission apparatus to which the present invention is applied.

As shown in FIG. 2, a system of an EOS transmission apparatus to which the present invention is applied includes a plurality of EOS (Ethernet over SONET / SDH) transmission apparatuses 110, a packet switching apparatus 120, an OAM control software 130, and It consists of an operating system 140. In addition, the EOS transmitter 110 includes a SONET / SDH signal matching layer unit 112, an EOS adaptation layer unit 114, and an Ethernet frame transfer unit 116, respectively.

The SONET / SDH signal matching layer unit 112 includes two input / output signal terminals, an operation signal input / output terminal 102 and a preliminary signal input / output terminal 104, and a SONET / SDH optical carrier (MOC) -M / STM (Synchronous). Transport Module (N) signals are thought and history as VC (virtual container) 3/4 signals.

The SONET / SDH signal matching layer unit 112 multiplexes the time slot-switched VC 3/4 signal, and frames and outputs a SONET / SDH OC-M / STM-N signal.

The EOS adaptation layer unit 114 extracts an Ethernet signal from the time slot-switched VC 3/4 signal in the SONET / SDH signal matching layer unit 112. In addition, the EOS adaptation layer 114 converts the extracted Ethernet signal into a fixed length packet or recombines a packet-switched fixed length packet to generate an Ethernet signal to map to a VC 3/4 signal and to perform a packet / time slot bridge function. Do this.

The Ethernet frame transfer unit 116 transfers the Ethernet frame converted into a packet of a fixed length by the EOS adaptation layer unit 114 to the packet switching device 120.

The packet switching device 120 switches and outputs the Ethernet frame traffic converted into a packet of a fixed length transmitted from the Ethernet frame forwarding unit 116 of the EOS transmitter 110.

The OAM control software unit 130 monitors and controls the EOS transmitter 110 and the packet switching device 120.

The operation system 140 provisions, maintains, and manages a network consisting of a system of the EOS transmission apparatus 110 through a communication line 106 between devices.

3 is an inter-layer structure diagram of an EOS transmission apparatus to which the present invention is applied.

Referring to FIG. 3, the EOS transmission apparatus 200 to which the present invention is applied includes a SONET / SDH signal matching layer unit 201, an EOS adaptation layer unit 202, and an Ethernet frame transfer unit 203. In the EOS transmission apparatus 200, a mutual conversion is performed between signals of the SONET / SDH layer, signals of the EOS adaptation layer, and signals of the Ethernet layer according to a predefined conversion relationship, whereby maintenance signals are mutually interchanged. Can be delivered.

The SONET / SDH signal matching layer unit 201 is an SONET / SDH optical carrier level (MOC) -M / STM (operating signal input / output terminal 21 and preliminary signal input / output terminals 22 which are two input / output signal terminals). SONET that processes SONET / SDH frames with Synchronous Transport Module level (N-N) signals in physical interface, regeneration section, multiplexing section, and virtual concatenation (VC) -n pass step It serves as the / SDH layer 204.

In order to convert the SONET / SDH signal into a fixed packet signal, the EOS adaptation layer unit 202 may have a SONET / SDH virtual concatenation (VCAT) group, a generic frame procedure (GFP), and a link capacity adjustment scheme (LCAS). Serves as an EOS adaptation layer 205 that performs a recovery function. The EOS adaptation layer unit 202 monitors the LCAS failure status of member paths in the VCAT group. At this time, if a failure occurs in a specific member path, the member path is disabled and service is provided only by the remaining member paths in the group.

The Ethernet frame forwarding unit 203 serves as an Ethernet layer 206 for switching and delivering a packet to a destination through Ethernet frame forwarding.

In the opposite case, the incoming Ethernet signal is routed back to the SONET / SDH signal. In order to guarantee the state and connectivity of signals of each layer in the EOS transmission apparatus 200, input and output signals must collect and transmit a maintenance signal generated in each layer. The maintenance signal in the conventional EOS transmitter is transmitted only at the physical, relay, multiplex, and pass stages of the SONET / SDH layer 204, and only detects the EOS adaptation layer 205 and the Ethernet layer 206. . In order to ensure the connectivity of the input and output signals, the maintenance signal transmitted from the SONET / SDH layer 204 must be transmitted as the maintenance signal of the EOS adaptation layer 205 and the Ethernet layer 206.

Therefore, in the EOS transmission apparatus for processing the input and output signals of the multi-layer according to the present invention, the maintenance signal, EOS adaptation of the SONET / SDH layer in consideration of the relationship between the SONET / SDH layer and the Ethernet layer in the OAM control software unit 130 The mutual conversion relationship between the maintenance signal of the layer and the maintenance signal of the Ethernet layer is predefined in a conversion table (not shown), and the maintenance signal generated between each layer is mutually converted by using the conversion table. Try to communicate with each other. This mutual conversion relationship may be defined for each path of an input signal.

4 is a logical multi-layer structure in an EOS transmission apparatus according to the present invention.

As shown in FIG. 4, the logical hierarchy in the EOS transmission apparatus 200 according to the present invention is the MPLS protocol processing using the SONET / SDH layer unit 301 and SONET / SDH signal for processing the SONET / SDH signal. The MPLS over SONET / SDH hierarchy consisting of the MPLS layer 304. More specifically, the SONET / SDH layer unit 301 for processing SONET / SDH signals, the EOS adaptation layer unit 302 for converting Ethernet signals from signals of the SONET / SDH layer unit 301, and the mutual An MPLS over Ethernet over SONET / SDH hierarchy consists of an Ethernet layer unit 303 for processing the converted Ethernet signal and an MPLS layer unit 304 for processing the MPLS protocol using the Ethernet signal. It is possible to provide the connectivity state of the service signal through the transfer of the SSF (Server Signal Fail) 305 which is a maintenance signal between the layers.

5 is a flowchart illustrating a process of transmitting a maintenance signal between multiple layers in an EOS transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 5, the OAM control software unit 501 which controls and manages the EOS transmission apparatus previously defines the mutual conversion relationship between the SONET / SDH maintenance signal, the EOS maintenance signal, and the Ethernet maintenance signals (S511). The mutual conversion relationship of the maintenance signal may be defined in consideration of the dependent correlation between the SONET / SDH signal matching layer unit 502 and the EOS adaptation layer unit 503 and the Ethernet frame transfer unit 504. In addition, the mutual conversion relationship of the maintenance signals between the layers is previously defined for each path of the input signal, and the mutual conversion relationship of the maintenance signal for each path of the input signal is recorded in a predetermined signal conversion table. Therefore, the signal conversion table can be used when mutually converting maintenance signals between multiple layers in an EOS transmission apparatus.

Further, the OAM control software unit 501 operates the periodic watchdog timer to collect the maintenance signal of the EOS transmitter (S512), and the SONET / SDH signal matching layer unit 502 in accordance with the operation of the watchdog timer. Periodically monitoring the EOS adaptation layer unit 403 and the Ethernet frame transfer unit 504 is performed.

The OAM control software unit 501 requests the SONET / SDH signal matching layer unit 502 to detect the SONET / SDH maintenance signal in a corresponding period according to the operation of the timer (S512) (S513). In order to respond, the SONET / SDH signal matching layer unit 502 detects a SONET / SDH maintenance signal with respect to an input signal (S514) and the detected SONET / SDH maintenance signal to the OAM control software unit 501. It passes (S515). As described above, the OAM control software unit 501 collects the transmitted SONET / SDH maintenance signal and reports the detection result of the SONET / SDH maintenance signal to the operation management system 505 (S516).

At this time, the OAM control software unit 501 uses the SONET / SDH signal matching layer unit 502 and the EOS adaptation layer unit 503 to convert the maintenance signal between the SONET / SDH signal matching layer. The SONET / SDH maintenance signal transmitted from the unit 502 is converted into an EOS maintenance signal (S517). The maintenance signal is converted using the signal conversion table described above.

The OAM control software unit 501 transmits the converted EOS maintenance signal to the EOS adaptation layer unit 503 (S518), and the EOS adaptation layer unit 503 transmits the transferred EOS maintenance signal. Is inserted into a portion of the frame (S519). As a result, the EOS adaptation layer unit 503 has the information of the SONET / SDH maintenance signal for each input signal path with respect to one input signal input to the SONET / SDH signal matching layer unit 502.

Subsequently, the OAM control software unit 501 requests the EOS adaptation layer unit 503 to detect the EOS maintenance signal in a corresponding period according to the operation of the timer (S512) (S520), and responds to the request. The EOS adaptation layer unit 503 detects an EOS maintenance signal with respect to the input signal (S521) and transmits the detected EOS maintenance signal to the OAM control software unit 501 (S522). As described above, the OAM control software unit 501 collects the transmitted EOS maintenance signal and reports the detection result of the EOS maintenance signal to the operation management system 505 (S523).

In this case, the EOS maintenance signal transmitted in step S522 includes information on the EOS maintenance signal of the EOS adaptation layer unit 503 and SONET / SDH maintenance of the SONET / SDH signal matching layer unit 502 inserted in step S519. The complementary signal information is included. Accordingly, the OAM control software unit 501 utilizes a conversion relationship of maintenance signals between a predefined SONET / SDH signal matching layer unit 502, an EOS adaptation layer unit 503, and an Ethernet frame transfer unit 504. By converting the transferred SONET / SDH maintenance signal and EOS maintenance signal to the Ethernet maintenance signal (S524). The maintenance signal is converted using the signal conversion table described above.

The OAM control software unit 501 transfers the Ethernet maintenance signal converted as described above to the Ethernet frame transfer unit 504 (S525), and the Ethernet frame transfer unit 503 transmits the transferred Ethernet maintenance signal. Is inserted into a portion of the frame (S526). At this time, the Ethernet frame transfer unit 503 is information of the SONET / SDH maintenance signal and EOS maintenance signal for each path of the input signal for the first input signal input to the SONET / SDH signal matching layer unit 502 Will have

Subsequently, the OAM control software unit 501 requests the Ethernet maintenance signal detection from the Ethernet frame transfer unit 504 at a corresponding period according to the operation of the timer (S512) (S527), and responds to the request. The Ethernet frame transfer unit 503 detects an Ethernet maintenance signal with respect to the input signal (S528) and transmits the detected Ethernet maintenance signal to the OAM control software unit 501 (S529). As described above, the OAM control software unit 501 collects the transferred Ethernet maintenance signal and reports the detection result of the Ethernet maintenance signal to the operation management system 505 (S530).

These processes can be performed during the operation of the EOS transmission apparatus according to the present invention, and the conversion history of the maintenance signal between each layer is recorded in a predetermined history table (not shown). That is, from the SONET / SDH signal matching layer unit 502 and the EOS adaptation layer unit 503 based on a conversion relationship between a predefined SONET / SDH maintenance signal and EOS maintenance signal and an Ethernet maintenance signal. Each maintenance signal collected is converted into an Ethernet maintenance signal and the history of the conversion is stored in a history table.

As described above, in the present invention, in the EOS transmission apparatus for processing input / output signals of multiple layers, the maintenance signal of the SONET / SDH layer and the maintenance signal of the Ethernet layer are considered in consideration of the relationship between the SONET / SDH layer and the Ethernet layer. The mutual conversion system is defined in advance so that maintenance signals generated between layers can be mutually converted and transmitted.

As a result, the number of maintenance signals generated and transmitted by the EOS transmission apparatus can be reduced, the state of the input / output signals can be quickly and accurately transmitted, the continuity of the input / output signals can be ensured, and the performance of the EOS transmission apparatus can be further improved.

The drawings and detailed description of the invention are merely exemplary of the invention, which are used for the purpose of illustrating the invention only and are not intended to limit the scope of the invention as defined in the appended claims or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the present invention, by pre-defining the correlation of the maintenance signal between the multiple layers in the EOS transmitter in advance by converting the maintenance signal between the layers to each other to reduce the number of maintenance signals generated and transmitted in the EOS transmitter This provides the operator's convenience and ensures the continuity of the signal by quickly delivering maintenance signals between layers.

Claims (12)

In the method of transmitting maintenance signals between multiple layers in an EOS (Ethernet over SONET / SDH) transmission apparatus having a multi-layer structure, A first step of predefining a mutual conversion relationship between a maintenance signal of a SONET / SDH (Synchronous Optical Network / Synchronous Digital Hierarchy) layer, a maintenance signal of an EOS adaptation layer, and a maintenance signal of an Ethernet layer; And A second step of mutually converting a maintenance signal independently generated for each layer by using the defined conversion relationship and transferring each other between the layers; Maintenance signal transmission method between multiple layers in the EOS transmission apparatus comprising a. The method of claim 1, wherein the first step, Inter-layer maintenance in an EOS transmission apparatus characterized by defining the mutual conversion relationship between the maintenance signal of the SONET / SDH layer, the maintenance signal of the EOS adaptation layer, and the maintenance signal of the Ethernet layer for each input signal path. Complement signaling method. The method of claim 1, Requesting detection of a maintenance signal for the EOS transmitter; Collecting maintenance signals mutually transmitted between the layers; And Transmitting the collected maintenance signal to an operation management system; The method for transmitting maintenance signals between multiple layers in an EOS transmission device further comprising a. The method of claim 1, The method of claim 1, wherein the conversion of the plurality of inter-layer maintenance signals has continuity for one input signal. In the multi-layer maintenance signal transmission method in a multi-layered EOS transmission apparatus controlled by an OAM control software unit, and including a SONET / SDH signal matching layer unit, an EOS adaptation layer unit, and an Ethernet frame transfer unit, Detecting a SONET / SDH maintenance signal by the SONET / SDH signal matching layer unit with respect to an input signal; A second step of converting the detected SONET / SDH maintenance signal into an EOS maintenance signal by using a previously defined conversion relationship between maintenance layers between each layer and transferring the converted EOS maintenance signal to an EOS adaptation layer unit; ; Inserting the transferred SONET / SDH maintenance signal into a frame by the EOS adaptation layer unit and transferring the converted EOS maintenance signal to an OAM control software unit according to a detection request of the EOS maintenance signal; A fourth step of converting the detected SONET / SDH maintenance signal and the EOS maintenance signal into an Ethernet maintenance signal using a previously defined conversion relationship between maintenance layers between each layer and transferring the detected SONET / SDH maintenance signal to the Ethernet frame transfer unit; A fifth step of inserting the transferred Ethernet maintenance signal into a frame by the Ethernet frame transfer unit and transferring the converted Ethernet maintenance signal to an OAM control software unit according to a detection request of the Ethernet maintenance signal; A sixth step of reporting the detected SONET / SDH maintenance signal, EOS maintenance signal, and Ethernet maintenance signal to an operation management system; Maintenance signal transmission method between multiple layers in the EOS transmission apparatus comprising a. The method of claim 5, wherein the first step, And requesting detection of a maintenance signal for the EOS transmitter by the OAM control software. The method of claim 5, wherein the first step, And storing the detected SONET / SDH maintenance signal in a predetermined signal management table in the SONET / SDH signal matching layer unit. The method of claim 5, wherein the second step, The OAM control software unit further comprises the step of requesting the detection of the SONET / SDH maintenance signal inserted into the frame of the EOS adaptation layer unit. The method of claim 5, wherein the second step, And detecting and inserting the inserted SONET / SDH maintenance signal in a predetermined signal management table in the EOS adaptation layer unit. The method of claim 5, The mutual conversion relationship between the maintenance signals between the layers is defined for each path of the input signal and recorded in a predetermined conversion table. The method of claim 5, The mutual conversion of the maintenance signals between the layers is performed for each signal input during the operation of the EOS transmission apparatus, and the history of the conversion of the maintenance signals between the layers is stored in a predetermined conversion history table. A method of transmitting maintenance signals between multiple layers in an EOS transmitter. The method of claim 5, A method for transmitting maintenance signals between multiple layers in an EOS transmission apparatus, wherein the selected one of the plurality of maintenance signals generated for each layer is reported to the operation management system with respect to one input signal.

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