KR20020052804A - Apparatus and method of equipment to process ATM layer OAM functions in the reciever for ATM subscriber interface - Google Patents

Abstract

PURPOSE: An apparatus and method for the OAM(Operation And Maintenance) of an ATM layer in an ATM network is provided to increase the OAM efficiency of an ATM layer in the case of connection setup at an ATM subscriber interface unit. CONSTITUTION: A received header conversion and OAM processing part(23) is comprised of a received cell header conversion part(31), a fault management processing part(32), a performance monitoring processing part(33), a header conversion and OAM table(35), and a header conversion and OAM table management part(34). The received cell header conversion part(31) converts the header of a user cell or an OAM cell and transfers it to a switch interface part(14). The fault management processing part(32) creates an AIS(Alarm Indication Signal) cell according to the command of a control part(16) and transfers it to the switch interface part(14). The performance monitoring processing part(33) creates a BR(Backward Reporting) OAM cell after executing the processing of a performance monitoring function when an FPM(Forward Performance Monitoring) OAM cell for a relevant connection is received. Then the performance monitoring processing part(33) converts the header of the created BR OAM cell and transmits it to the control part(16) and a transmitting side(39). The header conversion and OAM table(35) is composed of an SRAM storing OAM parameters associated with fault management and performance monitoring. The header conversion and OAM table management part(34) manages the parameters stored in the header conversion and OAM table(35) according to requests from the received cell header conversion part(31), the fault management processing part(32) and the performance monitoring processing part(33).

Description

Apparatus and method of equipment to process ATM layer OAM functions in the reciever for ATM subscriber interface}

The present invention provides an operation and maintenance apparatus for operating and maintaining an ATM layer (OAM) and a method thereof, and a method of establishing a corresponding connection at a receiving side in an Asynchronous Transfer Mode (ATM) subscriber matching device. The present invention relates to a computer-readable recording medium having recorded thereon a program for realizing this.

For reference, with respect to the ATM matching device, a "device and method for generating a reverse monitoring cell in an ATM matching device" (Korean Patent Registration No. "0226453", registered date July 27, 1999) is as follows.

Prior patents (Korean Patent Registration No. “0226453”, registered on July 27, 1999) are used in the virtually connected state to reduce the load on the controller by processing the backward performance report cell in hardware among the performance monitoring functions processed by the controller. A method for generating a reverse monitoring cell at a receiving side to check transmission performance of a virtual connection by monitoring a user cell transmitted and received with each other. Only the connection identifier of the forward monitoring cell is transferred to the control unit in the ATM matching device to be used as the maintenance data of the system, and the load of the control unit can be reduced by generating the reverse monitoring cell by reading the data of the memory required by the performance monitoring hardware. That is, in order to reduce the load of the control unit by processing the backward performance report cell in the hardware among the performance monitoring functions processed by the control unit, when the forward performance monitoring cell is received, only the connection identifier of the cell is performed after performing the performance monitoring function processing. It can be used as maintenance data of the system by passing it to the control unit inside, and the reverse performance report cell generated by the control unit can be generated in hardware and transmitted in the reverse direction to reduce the load on the control unit. Therefore, some performance monitoring functions may be implemented in hardware to provide efficient performance monitoring and to reduce the load on the controller.

On the contrary, since the present invention processes all performance monitoring functions in hardware, the performance monitoring can be performed in real time, thereby further improving the performance of the controller and adding the virtual path performance monitoring function. That is, when the forward performance monitoring cell is received on the connection, the performance monitoring function processing is performed, and then the generation of the backward performance reporting cell can be implemented in hardware and transmitted in the reverse direction to the control unit. Send to the controller. In addition, a virtual path performance monitoring function has been added.

In conclusion, the preceding patent is to implement the generation of the backward performance reporting cell in hardware when receiving the forward performance monitoring cell, but the present invention implements the generation of the backward performance reporting cell in hardware upon receiving the forward performance monitoring cell. It can be transmitted in the reverse direction with the control unit, the header is converted to the received backward performance report cell and transmitted to the control unit. Therefore, the OAM processing capability of the system can be improved by reducing the process that the control unit reads from the table by using the connection identifier.

In general, OAM functions of the ATM layer in an ATM network include a function of enabling / disabling fault management, performance monitoring, fault management and performance monitoring.

The fault management function defines an alarm indication signal (AIS) and a remote fault indication (RDI) OAM cell that sends and receives a point of failure between nodes at each connection point and describes the procedure. . For example, when a virtual connection is established from the start point to the end point, if an abnormality occurs in the intermediate line, the intermediate node that detects it passes the AIS OAM cell to the next node, and the next node passes back to the next node to serve as the destination. When the node that is the end point of the connection receives the AIS OAM cell, the RDI OAM cell is forwarded to the starting node to inform the starting node of the connection.

In order to detect such a failure, there is a continuity check (CC) function and a loopback test function.

The continuity check function is to treat the connection as a failure if the user cell is not delivered through the connection for a long time even though the virtual connection is set. If there is no user cell to be delivered, the cell is not being delivered. In order to distinguish whether a cell is not being transmitted, a transmitter which generates a CC OAM cell and outputs the cell is not transmitted for a predetermined time (about 1 second) for a connection in which the continuity check is activated. If the receiving unit does not input the user cell or CC OAM cell for a certain period of time (approximately 3.5 seconds), it considers that a failure occurs in the corresponding connection, generates an AIS cell, and delivers the AIS cell to the next node to notify the failure.

Meanwhile, the loopback test is a function for checking a faulty node by transmitting a loopback OAM cell to each connection point and monitoring whether the loopback returns.

Performance monitoring is a function that processes user information to generate maintenance information about user information. This maintenance information is added to the user information at the origin of the connection, and when the Forward Performance Monitoring (FPM) OAM cell is received at the endpoint of the connection, it performs the necessary OAM statistics processing and performs backward reporting (BR) OAM. It generates a cell and reports backwards to the starting point, and sends it to the controller to analyze maintenance event information to analyze the prediction of transmission integrity.

Therefore, for the failure management, performance monitoring and OAM activation / deactivation illustrated in ITU-T Recommendation I.610, there is a way to improve the operation and maintenance processing capability of the ATM layer at the receiving side of the ATM subscriber interface. It is required.

The present invention has been made to solve the above problems, the present invention, an operation and maintenance apparatus and method and method for improving the operation and maintenance (OAM) efficiency of the ATM layer in the corresponding connection set-up of the receiving side in the ATM subscriber matching device and It is an object of the present invention to provide a computer-readable recording medium having recorded thereon a program for realizing the method.

1 is an exemplary configuration of a subscriber matching device of an asynchronous delivery mode (ATM) network to which the present invention is applied.

2 is an exemplary configuration diagram of the ATM layer processing unit of FIG. 1.

3 is a block diagram of an embodiment of the reception header conversion and OAM processing unit (operation and maintenance apparatus of the ATM layer) of FIG. 2 according to the present invention;

4 is a structural diagram of an embodiment of a failed cell generation request message used in the present invention.

5 is a structural diagram of an embodiment of a failure notification message used in the present invention.

Figure 6 is a structure diagram of an embodiment of a table managed by the header conversion and OAM table management unit used in the present invention.

7 to 9 are flowcharts of one embodiment of a method for operating and maintaining an ATM layer according to the present invention;

10 is a structural diagram of an embodiment of a transmitting cell transmitted to a control unit used in the present invention.

11 is a structural diagram of an embodiment of a transmitting cell to be transmitted to a transmitting side used in the present invention.

* Explanation of symbols for the main parts of the drawings

31: reception cell header conversion unit 32: failure management processing unit

33: performance monitoring processor 34: header conversion and OAM table management unit

35: header conversion and OAM table

In order to achieve the above object, the present invention provides a device for operating and maintaining an asynchronous transfer mode (ATM) layer, comprising a header of a user cell or an operation and maintenance (hereinafter referred to as "OAM") cell. A cell header converting means for converting and transmitting the converted signal to a switch interface unit and converting the header of the signal processing cell to a control unit; Generate a failure indication signal (AIS) cell according to the command of the control unit and transmit it to the switch interface unit, perform header conversion at the time of input of the fault management-related cell, and transfer it to the control unit. Fault management means for detecting and informing the controller of the occurrence of a fault; After performing the performance monitoring function processing when receiving the forward performance monitoring OAM cell for the connection, a reverse performance reporting OAM cell is generated, the header of the generated backward performance reporting OAM cell is converted and transmitted to the controller and the transmitting side. A performance monitoring means for converting the header of the reverse performance report OAM cell and transmitting the same to the control unit; Storage means for storing operation and maintenance parameters related to fault management and performance monitoring; And management means for managing parameters stored in the storage means according to the request of the controller, the cell header converting means, the fault management means, and the performance monitoring means.

In order to achieve the above object, the present invention provides a method for operating and maintaining an asynchronous transfer mode (ATM) layer, the header indication and the OAM table. After generating the signal (AIS) cell and passing it to the switch interface unit, and converts the header to the control unit when the input of the cell related to the failure management, the controller detects the failure through the continuity check for the connection and the occurrence of the failure to the control unit Informing the first step; And performing a performance monitoring function at the reception of the forward performance monitoring OAM cell for the connection by the performance monitoring processor, generating a reverse performance reporting OAM cell, and converting the generated backward performance reporting OAM cell to transmit to the controller. And a second step of converting the received backward performance report OAM cell's header and transmitting the same to the controller.

In order to achieve the above object, the present invention relates to an asynchronous transfer mode (ATM) layer operation and maintenance (OAM) device having a processor. After generating the AIS cell and transmitting the signal to the switch interface unit, the header is converted and transmitted to the control unit when the cell is associated with the fault management, and the control unit detects the failure through the continuity check for the connection and detects the occurrence of the failure. Informing the first function; And performing a performance monitoring function at the reception of the forward performance monitoring OAM cell for the connection by the performance monitoring processor, generating a reverse performance reporting OAM cell, and converting the generated backward performance reporting OAM cell to transmit to the controller. And a computer readable recording medium having a program recorded thereon for transmitting a second function of converting a header of the received backward performance report OAM cell to the control unit.

The present invention relates to a function processing for operating and maintaining an ATM layer when establishing a corresponding connection at a receiving side in an ATM subscriber matching device.

OAM functions of ATM layer in ATM network can be divided into Fault Management and Performance Monitoring. Fault management function can be used to detect faults and to detect the point of failure to other nodes. Continuity check and loopback test function. On the other hand, the performance monitoring function is a function that performs the performance monitoring function for each set connection and transmits the result between the ends of the connection established using the OAM cell, and such a performance monitoring or continuity check is activated and deactivated ( Procedures for activation / deactivation.

The present invention proposes a method and apparatus to be performed at the receiving side of an ATM subscriber matching device for failure management, performance monitoring, and OAM activation deactivation illustrated in ITU-T Recommendation I.610.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a subscriber matching device of an asynchronous delivery mode (ATM) network to which the present invention is applied. In the drawing, "11" is a subscriber line, "12" is a physical layer processor, "13" is an ATM layer processor; "14" represents a switch interface unit, "15" represents a switch network, "16" represents a control unit, and "17" represents a clock receiving unit, respectively.

As shown in FIG. 1, the subscriber matching device of the asynchronous delivery mode (ATM) network to which the present invention is applied, extracts an ATM cell from the frame data when receiving the data from the subscriber line 11, and then performs an ATM layer processing unit 13. The ATM physical layer processing unit 12 for transmitting an ATM cell received from the ATM layer processing unit 13 to the ATM subscriber line 11 and sending the cell to the ATM subscriber line 11, and receiving the cell from the ATM physical layer processing unit 12. Searches for connection identifiers with information on user parameter monitoring and various ATM layer operations and maintenance functions, and performs header conversion to transfer to switch interface unit 14 or received from switch interface unit 14. Serial data is transferred between the ATM layer processing unit 13 and the internal cell received from the ATM layer processing unit 13, which perform a function of converting an inner cell into an ATM cell to transfer the inner cell to the physical layer. Switch interface to convert the serial data received from the ATM switch network 15 to parallel data, extract the internal cell, and transfer the same to the ATM layer processor 13 by performing line coding. A unit 14, a control unit 16 for controlling the physical layer processing unit 12 and the ATM layer processing unit 13, and a clock receiving unit 17 for receiving a system clock and providing a clock to each processing unit.

The ATM layer processing unit 13 in the ATM subscriber matching apparatus will be described in more detail as follows.

FIG. 2 is an exemplary configuration diagram of the ATM layer processing unit of FIG. 1, where "21" is a reception connection identifier management unit, "22" is a user parameter monitoring unit, "23" is a reception header conversion and OAM processing unit, and "24" Denotes a switch link matching unit, "25" denotes a transmission link identifier management unit, "26" denotes a transmission header conversion and performance monitoring unit, and "27" denotes a cell spacing unit.

As shown in FIG. 2, the ATM layer processor 13 reads a cell from the physical layer processor 12 to form a virtual path identifier (vpi) / virtual channel identifier (VCI). From the receiving connection identifier management unit 21 and the receiving connection identifier management unit 21 which extracts the connection identifier by the line number, converts it into a cell form used in the ATM layer processing unit 13, and transmits it to the user parameter monitoring unit 22. User parameter monitoring unit 22 which performs user parameter monitoring using the information of the connection required for user parameter monitoring by receiving ATM cell, line number, connection type and connection identifier, and user parameter monitoring result and information of the connection. A header conversion and OAM processing unit 23 for performing header conversion and operating and maintaining various ATM layers, and a cell in which the header is converted. In the switch link matching section 24 and the switch link matching section 24 for receiving and delivering a cell to the switch interface unit 14 or for transmitting a cell received from the switch interface 14 to the transmission connection identifier management unit 25. A transmission connection identifier management unit 25 that receives the transmitted cell and manages a transmission connection identifier, and a transmission header conversion and performance monitoring unit that performs header conversion and various performance monitoring functions of the transmission cell with routing information using the connection identifier ( 26) and a cell spacing unit 27 which performs cell spacing by extracting user parameter information as a connection identifier and delivers the cell to the physical layer.

The ATM layer operation and maintenance apparatus proposed in the present invention is applied to the reception header conversion and OAM processing unit 23.

FIG. 3 is a diagram illustrating an embodiment of the reception header conversion and OAM processing unit (operation and maintenance apparatus of the ATM layer) of FIG. 2 according to the present invention.

As shown in FIG. 3, in the present invention, the reception header conversion and OAM processing unit (operation and maintenance apparatus of the ATM layer) 23 performs operation and maintenance of the asynchronous delivery mode (ATM) layer in the corresponding connection on the reception side. In the apparatus for receiving, the reception of converting the header of the user cell or the OAM cell passed through the switch interface unit 14, and converts the header of the signal processing cell to the control unit 16 Generates a fault indication signal (AIS) cell according to the command of the cell header converting unit 31 and the control unit 16 and transmits it to the switch interface unit 14 and inputs a fault management related cell (AIS, RDI, loopback cell). Forwards the performance of the header management processing unit 32 for performing a header conversion at the time and detecting the failure through the continuity check for the connection and informing the controller 16 of the failure. Performance monitoring at the reception of monitoring OAM cell After performing the performance processing, a reverse performance report OAM cell is generated, and the header of the generated reverse performance report OAM cell is converted and transmitted to the control unit 16 and the sender 39, and the header of the received reverse performance report OAM cell A conversion and OAM table 35 comprising a performance monitoring processor 33 for converting the data to the control unit 16 and transmitting the control unit 16, an SRAM for storing the operation and maintenance parameters related to the failure management and performance monitoring; Header conversion and OAM table management unit 34 for managing parameters stored in the header conversion and OAM table 35 according to the request of the receiving cell header conversion unit 31, the failure management processing unit 32, and the performance monitoring processing unit 33. It includes.

Then, the received header conversion and OAM processing unit (operation and maintenance device of the ATM layer) 23 to the internal FIFO 41 and the control unit 16 requesting the AIS cell generation from the control unit 16 or to the control unit 16. An internal FIFO 40 is provided for notifying the results of the continuity check.

When the user cell or the OAM cell to be passed is input, the receiving cell header converting unit 31 performs the user parameter monitoring function, and when the user parameter is observed, performs header conversion and passes 15 bytes of routing tags for passing the switch. In addition to the front end of the cell, 64 bytes of internal cells are output to the switch interface unit 14, or when a signal processing cell is input, header conversion necessary for signal processing is performed to control 64 bytes of internal cells. )

The failure management unit 32 generates an AIS cell to be generated by the control unit 16 and sends it to the switch interface unit 14. When the AIS, RDI, and loopback cells are input, the control unit performs header conversion to an internal cell of 64 bytes. Output to (16). In addition, the header conversion and OAM table manager 34 reads the continuity-related parameters required for the connection, and if the user cell or the continuity check (CC) OAM cell is not input for a predetermined time (preferably about 3.5 seconds), The controller 16 recognizes that the failure has occurred by outputting the type of interrupt and the connection identifier to the internal FIFO 40 in consideration of the failure.

When the performance monitoring processing unit 33 receives the Forward Performance Monitoring (FPM) OAM cell, the performance monitoring processing unit 33 performs the processing necessary for performance monitoring, and the header conversion and OAM table management unit 34 converts the performance monitoring result parameters required for the connection to the header. And stored in the OAM table 35, and generates a backward performance reporting (BR) OAM cell to perform header conversion into an internal cell of 64 bytes to output to the control unit 16, or 54 bytes for backward reporting. Outputs to the transmitting side 39 to the internal cell of.

The header conversion and OAM table manager 34 registers or inquires a parameter table according to the request for registration and inquiry of a new parameter from the controller 16, and requests from the fault management processor 32 and the performance monitoring processor 33. Read or update the registered parameter.

The structure of the internal FIFO 41 for requesting generation of an AIS cell by the controller 16 or by the controller 16 is shown in FIG. 4, and FIG. 5 shows an internal FIFO 40 that notifies the controller 16 of the continuity check result. ) Structure.

Now, the structure of the header transformation and OAM table 35 will be described in more detail with reference to FIG.

The CA 27 is a flag indicating whether the continuity check is activated.

A1 28 is a flag indicating that an AIS cell to be generated when a violation occurs as a result of a continuity check is a segment cell.

The AS 29 is a flag indicating that an AIS cell should be generated when a violation occurs as a result of the continuity check.

A2 30 is a flag indicating that an AIS cell to be generated when a violation occurs as a result of continuity check is an end-to-end cell.

TAT1 31 represents the time value needed to calculate whether 3.5 seconds has been violated when the continuity check is activated.

The OT 32 sets whether the connection type of the cell for header conversion is a virtual path connection (VPC) or a virtual channel connection (VCC).

The MA 33 is a flag indicating whether the performance monitoring is activated.

The VMA 34 is a flag indicating whether the virtual path (VP) performance monitoring is activated.

The SDP 35 is a flag indicating whether the segment OAM cell passes.

The EDP 36 is a flag indicating whether the end OAM cell has passed.

&Quot; 37 " to " 43 " represent routing information, group routing information, and output line number necessary for the BR OAM cell for header conversion or generation.

The FMF 44 is a flag for determining which of the control unit and the transmission unit to send the BR OAM cell to.

&Quot; 45 " to " 46 " represent output VPI and output VCI of the BR OAM cell for header conversion or generation.

P_BR_MCSN 47 indicates a cell sequence number to be generated next to the BR OAM cell to be generated.

P_FM_MCSN 48 indicates a cell sequence number of an FPM OAM cell to be input next.

The SECBC 49 is a block error counter by the processing of the FPM OAM cell.

The MI 50 indicates that the performance monitoring function is activated and the performance monitoring related OAM table is initialized.

The BLER 51 represents the number of parity bits in which an error detected by the BIP-16 code of the FPM OAM cell occurs.

P_FM_TUC01 (52) represents the total number of transmitted user cells (ie, CLP = 0 + 1) inserted into the FPM OAM cell.

P_FM_TUC0 53 represents the total number of transmitted user cells (ie, CLP = 0) inserted into the FPM OAM cell.

P_FM_TRCC01 (54) represents the total number of user cells (i.e., CLP = 0 + 1) received at the receiver up to the previously inputted performance monitoring cell after the performance monitoring starts.

P_FM_TRCC0 55 represents the total number of user cells (ie, CLP = 0) received at the receiver until the present time after the performance monitoring is started.

P_FM_BIP-16 (56) is a BIP-16 code for the user cell received at the receiver after the previously entered performance monitoring cell.

C_FM_TRCC01 (57) represents the total number of user cells (ie, CLP = 0 + 1) received at the receiver until the currently input performance monitoring cell after the performance monitoring starts.

The VP ConID 58 represents a connection identifier for monitoring the performance of the virtual path connection (VPC).

FIG. 7 illustrates an AIS generation process required by the controller 16 as some functions processed by the failure management processor 32.

If a user or a passing OAM cell is received (701), after performing header conversion (704) and outputs to the switch interface unit 14 (705).

On the other hand, if a user or a passing OAM cell is not received (701), it is checked whether there is data in the internal FIFO 41 requesting AIS generation (702), and if there is data, an AIS cell is generated to perform header conversion. After that (703) is output to the switch interface unit 14 (705).

8 illustrates a failure occurrence notification / release process handled by the failure management processor 32.

If the user or CC cell is not received (801), it is checked whether the CA 27 is activated (802), and if the CA 27 is activated, it is checked whether the AS 29 is activated (803). ).

As a result of the inspection, if the AS 29 is not activated, the time when the cell is not received is 3.5 seconds has passed (804), if 3.5 seconds has passed AS 29 is set to 1 (805), the internal Notify FIFO 40 that a CC violation has occurred (806). At this time, the internal FIFO 40 generates an interrupt and notifies the control unit 16.

As a result of the check, if the CA 27 is activated and the AS 29 is activated, it is checked whether the time when the cell is not received has passed 1 second (807), and if 1 second has passed, A1 (28) and A2 (30). Request to create an AIS cell with the internal FIFO 41 (808). The internal FIFO 41 then generates an interrupt and notifies the control unit 16.

On the other hand, if a user or CC cell is received (801), check whether the AS (29) is activated (809), if enabled, set the AS (29) to 0 (810), and to the internal FIFO 40 Notify that the CC violation has been released (811). The internal FIFO 40 then generates an interrupt and notifies the control unit 16.

9 shows a performance monitoring process in the performance monitoring processing unit 33.

If the end FPM OAM cell is received (901), the first FPM OAM cell is checked (902), and if it is the first FPM cell, the MI (50) is set to 1 (903), and the performance monitoring related OAM table is set. After initialization (904), BR OAM cell generation and header conversion are performed (905), and performance monitoring related OAM data are stored in header conversion and OAM table 35 (906).

As a result of the check 902, if it is not the first FPM cell, a BR OAM cell is immediately generated and header converted (905), and performance monitoring related OAM data are stored in the header converted and OAM table 35 (906).

Then, if the header-converted BR OAM cell is "FMF = 11" by the FMF 44 (907), the control unit 16 transmits 64 bytes as shown in FIG. 10 (BR OAM cell transmitted to the control unit) to the transmitting side. Transmits in 54 bytes as shown in FIG. 11 (BR OAM cell transmitted to the transmitting side) (908).

If the header-converted BR OAM cell is "FMF = 10" by the FMF 44 (907), the transmitter 39 transmits 54 bytes as shown in Fig. 11 (909).

If the header converted BR OAM cell is "FMF = 01" by the FMF 44 (907), it is transmitted to the control unit 16 in 64 bytes as shown in FIG. 10 (910).

On the other hand, when the user cell is received instead of the end FPM OAM cell (901) (911), it is checked whether the MA 33 and the MI 50 are activated (912). In step 914, all received user cells are counted, BIP-16 calculation is performed, and the number of parity errors is counted to store performance monitoring related OAM data in the header conversion and OAM table 35 (916).

On the other hand, when receiving the BR OAM cell (917), when performing the header conversion to 64 bytes as shown in Figure 10 to indicate that the received BR OAM cell to set the 12th byte from the 9th byte to 00 control unit ( 16) (918).

When the performance monitoring request 34 of a virtual path connection (VPC) is activated (when VMA (34) = 1), the connection identifier of the corresponding OAM connection is managed for connection of all virtual channel connections using the virtual path (VP). The connection identifier 58 of the virtual path connection is registered in the information.

If a new virtual channel connection is established while the performance monitoring of the corresponding virtual path connection is set, the corresponding virtual path connection identifier must be registered in the connection management information of the new virtual channel connection. After the setting is completed, if a cell is input through an arbitrary virtual channel connection using the corresponding virtual path, the connection identifier (58) of the corresponding virtual path is read in addition to the existing function to connect the virtual path OAM connection with this connection identifier. The management information is read to perform the same function as the virtual channel connection performance monitoring as shown in FIG. 9.

When the FPM OAM cell is input through the virtual path OAM connection, the same operation as when the FPM OAM cell is input through the general virtual channel connection is performed.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

The present invention as described above, by using the connection identifier to read the table in the control unit by reducing the process that is determined by the control unit, there is an effect that can significantly improve the system OAM processing capacity.

Claims (12)

An apparatus for operating and maintaining an asynchronous delivery mode (ATM) layer, Cell header converting means for converting a header of a user cell or an operation and maintenance (hereinafter referred to as "OAM") cell to be transmitted to a switch interface unit, and converting a header of a signal processing cell to a control unit; Generate a failure indication signal (AIS) cell according to the command of the control unit and transmit it to the switch interface unit, perform header conversion at the time of input of the fault management-related cell, and transfer it to the control unit. Fault management means for detecting and informing the controller of the occurrence of a fault; After performing the performance monitoring function processing when receiving the forward performance monitoring OAM cell for the connection, a reverse performance reporting OAM cell is generated, the header of the generated backward performance reporting OAM cell is converted and transmitted to the controller and the transmitting side. A performance monitoring means for converting the header of the reverse performance report OAM cell and transmitting the same to the control unit; Storage means for storing operation and maintenance parameters related to fault management and performance monitoring; And Management means for managing parameters stored in the storage means in accordance with the request of the controller, the cell header conversion means, the failure management means and the performance monitoring means; Device for operation and maintenance of the asynchronous delivery mode layer in the asynchronous delivery mode network comprising a. The method of claim 1, The storage means, Substantially, a flag indicating whether the continuity check is activated (CA), a flag (A1) indicating that a failure indication signal (AIS) cell to be generated when a violation occurs as a result of the continuity check (A1), and a continuity check A flag indicating that an AIS cell should be generated when a result violation occurs, and an end-to-end type of fault indication signal (AIS) cell to be generated when a violation occurs as a result of a continuity test. ) A flag indicating a cell (A2), a time value (TAT1) required to calculate whether a predetermined time (preferably 3.5 seconds) has been violated when the continuity check is activated, and the connection type of the header converting cell is a virtual path connection ( Value (OT) to set whether VPC) or virtual channel connection (VCC), flag indicating whether activation of performance monitoring (MA), flag indicating whether activation of virtual path (VP) monitoring (VMA), segment OA A flag indicating whether or not the M cell has passed (SDP), a flag indicating whether or not the end OAM cell has passed (EDP), header conversion or generating backward performance reporting (BR) routing information required for the OAM cell, group routing information, and output line number. A flag (FMF) for deciding whether to send a BR OAM cell to a controller or a transmitter, an output VPI of a header conversion or generating BR OAM cell, a value indicating an output VCI, and a cell order to be generated next to the generating BR OAM cell Value indicating number (P_BR_MCSN), cell sequence number of forward performance monitoring (FPM) OAM cell to be input next (P_FM_MCSN), block error counter (SECBC) by processing of FPM OAM cell, performance monitoring function Value (MI) indicating that the performance monitoring-related OAM table has been initialized, the number of parity bits (BLER) in error detected by the BIP-16 code of the FPM OAM cell, and the transmitted user cell inserted into the FPM OAM cell (i.e. , CLP = 0 + 1) The total number (P_FM_TUC01), the total number of transmitted user cells (i.e., CLP = 0) inserted into the FPM OAM cell (P_FM_TUC0), the user cells received at the receiver up to the previously entered performance monitoring cell after the performance monitoring starts ( That is, the total number of CLP = 0 + 1) (P_FM_TRCC01), the total number of user cells (ie, CLP = 0) received at the receiver until the start of performance monitoring (ie, CLP = 0), and after the previously inputted performance monitoring cell. BIP-16 code (P_FM_BIP-16) for the user cell received by the receiver at the receiver, the total number of user cells (ie, CLP = 0 + 1) received at the receiver up to the currently entered performance monitoring cell after the performance monitoring began ( C_FM_TRCC01), a device for operating and maintaining an asynchronous delivery mode layer in an asynchronous delivery mode network, comprising a value indicating a connection identifier (VP ConID) for monitoring the performance of the virtual path connection (VPC). The method according to claim 1 or 2, The cell header converting means, When the user cell or OAM cell is passed, the user parameter monitoring function is executed. If the user parameter is observed, the routing tag for performing header conversion and passing the switch is added to the front of the cell. Asynchronous delivery mode in the asynchronous delivery mode network, characterized in that to output the internal cell to the switch interface unit, or if the signal processing cell is input to perform the header conversion necessary for signal processing to output the 64 bytes of the internal cell to the controller. Tier operation and maintenance unit. The method according to claim 1 or 2, The failure management means, The control unit generates an AIS cell to be generated and sends it to the switch interface unit. When a fault indication signal (AIS), a remote fault indication (RDI), or a loopback cell is input, the header is converted into an internal cell of 64 bytes to the controller. If the user cell or continuity check (CC) OAM cell is not input for a certain period of time (preferably 3.5 seconds) by reading the continuity parameters required for the connection from the storage means, the connection is regarded as a failure. A device for operating and maintaining an asynchronous delivery mode layer in an asynchronous delivery mode network, characterized in that the controller recognizes that a failure has occurred by outputting a kind of interrupt and a connection identifier to a first-in first-out (FIFO) unit. The method according to claim 1 or 2, The performance monitoring means, When receiving a forward performance monitoring (FPM) OAM cell, it performs the processing necessary for performance monitoring, the management means stores the performance monitoring result parameters required for the connection in the storage means, and generates a reverse performance reporting (BR) OAM cell. Operation and maintenance of the asynchronous delivery mode layer in the asynchronous delivery mode network, characterized in that the header conversion to 64 bytes of internal cells to output to the control unit, or 54 bytes of internal cells to the transmitting side for reporting in the reverse direction Repair device. The method according to claim 1 or 2, The management means, When a request for registration and inquiry of a new parameter is requested from the controller, the parameter table is registered or inquired accordingly, and the registered parameter requested by the failure management means and the performance monitoring means is read or updated. Operation and maintenance unit in the asynchronous delivery mode layer in the system. In the method of operating and maintaining an asynchronous delivery mode (ATM) layer, Refer to header conversion and OAM table, The fault management processor generates an AIS cell according to the command of the controller and transfers it to the switch interface unit, converts the header when the fault management-related cell is input to the controller, and checks the continuity for the connection. Detecting a failure through the first step and informing the controller of the failure; And The performance monitoring processor performs a performance monitoring function upon receiving the forward performance monitoring OAM cell for the connection, generates a reverse performance reporting OAM cell, converts the generated header of the reverse performance reporting OAM cell, and sends it to the controller and the transmitting side. A second step of converting and transmitting the received backward performance report OAM cell's header to the controller; Device for operation and maintenance of the asynchronous delivery mode layer in the asynchronous delivery mode network comprising a. The method of claim 7, wherein The header conversion and OAM table, Substantially, a flag indicating whether the continuity check is activated (CA), a flag (A1) indicating that a failure indication signal (AIS) cell to be generated when a violation occurs as a result of the continuity check (A1), and a continuity check A flag indicating that an AIS cell should be generated when a result violation occurs, and an AIS cell that is to be generated when a violation occurs as a result of a continuity test. A flag indicating that it is an end-to-end cell (A2), a time value (TAT1) required for calculating whether a predetermined time (preferably 3.5 seconds) has been violated when the continuity check is activated, and a connection type of a cell for header conversion Value (OT) to set whether is a virtual path connection (VPC) or a virtual channel connection (VCC), a flag indicating whether activation of performance monitoring (MA), a flag indicating whether activation of virtual path (VP) performance monitoring (VM) A), a flag indicating whether the segment OAM cell has passed (SDP), a flag indicating whether the end OAM cell has passed (EDP), header conversion or generating backward performance reporting (BR) routing information required for the OAM cell, and group routing information. , An output line number, a flag (FMF) for deciding whether to send a BR OAM cell to a control unit or a transmitter, a value indicating an output VPI, an output VCI of a header conversion or generating BR OAM cell, and a value after the generating BR OAM cell. A value indicating the cell sequence number to be generated (P_BR_MCSN), a value indicating the cell sequence number of the forward performance monitoring (FPM) OAM cell to be input (P_FM_MCSN), a block error counter (SECBC) by processing the FPM OAM cell, and performance A value indicating that the watchdog function is enabled and the OAM table related to the monitoring is initialized (MI), the number of parity bits (BLER) in which an error has been detected by the BIP-16 code of the FPM OAM cell, and the transmitted inserted in the FPM OAM cell. user Total number of cells (i.e. CLP = 0 + 1) (P_FM_TUC01), Total number of transmitted user cells (i.e., CLP = 0) inserted in the FPM OAM cell (P_FM_TUC0), previously entered after performance monitoring starts The total number of user cells (i.e., CLP = 0 + 1) received at the receiver up to the performance monitoring cell (P_FM_TRCC01), and the total number of user cells (i.e., CLP = 0) received at the receiver up to the present after monitoring starts ( P_FM_TRCC0), the BIP-16 code (P_FM_BIP-16) for the user cell received at the receiver after the previously entered performance monitoring cell (P_FM_BIP-16), the user cell received at the receiver up to the currently entered performance monitoring cell after the performance monitoring has started (i.e. , CLP = 0 + 1), the total number of C_FM_TRCC01, and a value indicating a connection identifier for monitoring performance of the virtual path connection (VPC) (VP ConID). How to operate and maintain tiers. The method according to claim 7 or 8, The process of generating a failure indication signal (AIS) required by the controller in the failure management processor, A third step of, upon receiving a user or a passing OAM cell, performing header conversion and outputting the header interface unit; And If a user or a passing OAM cell is not received, it checks whether there is data in the internal first-in, first-out (FIFO) section that requires generation of the failure indication signal (AIS), and if there is data, generates a failure indication signal (AIS) cell A fourth step of outputting the switch interface unit after the conversion Operation and maintenance method of the asynchronous delivery mode layer in an asynchronous delivery mode network comprising a. The method according to claim 7 or 8, The failure occurrence / release process in the failure management unit, If a user or continuity check (CC) cell is not received, verify that a flag (CA) indicating whether continuity check is enabled is enabled, and if CA is enabled, an AIS cell should be generated when a violation occurs as a result of the continuity check. A third step of checking whether a flag (AS) indicating that it is activated is activated; As a result of the inspection of the third step, if the AS is not activated, it is analyzed whether the time when the cell is not received has passed the first predetermined time (preferably 3.5 seconds), and the first predetermined time (preferably 3.5 seconds), the AS is set to one ("1"), and the first internal first-in first-out (FIFO) unit informs that a CC violation has occurred, and the internal first-in first-out (FIFO) unit generates an interrupt. A fourth step of notifying the control unit; As a result of the inspection in the third step, if the CA is activated and the AS is activated, it is checked whether the time when the cell is not received has passed a second predetermined time (preferably 1 second), and the second predetermined If a time (preferably 1 second) has elapsed, a flag (A1) indicating that the type of failure signal (AIS) cell to be generated when a violation occurs as a result of a continuity check (A1), a violation occurred as a result of a continuity check When a failure indication signal (AIS) cell to be generated is requested to generate an AIS cell to the second internal first-in first-out (FIFO) unit by a flag (A2) indicating that the type is an end cell, the internal first-in first-out (FIFO) causes an interrupt. A fifth step of generating and notifying the control unit; And When a user or CC cell is received, it checks whether the AS is activated, if it is activated, sets the AS to zero ("0"), and notifies the first internal first-in first-out (FIFO) unit that the CC violation has been released. A sixth step in which the first internal first-in first-out (FIFO) unit generates an interrupt and notifies the control unit; Operation and maintenance method of the asynchronous delivery mode layer in an asynchronous delivery mode network comprising a. The method according to claim 7 or 8, The performance monitoring process in the performance monitoring processing unit, Determining a type of a receiving cell; A fourth step of confirming whether the first FPM OAM cell is received when the terminal forward performance monitoring (FPM) OAM cell is received as the determination result of the third step; As a result of the checking in the fourth step, if the first FPM cell, the performance monitoring function is activated and the value MI indicating that the performance monitoring related OAM table is initialized is set to one ("1"), and the performance monitoring related OAM table is initialized. A fifth step of performing a reverse performance reporting (BR) OAM cell generation and header transformation and storing performance monitoring related OAM data in the header transformation and OAM table; A sixth step of immediately generating a BR OAM cell and performing header conversion, and storing performance monitoring-related OAM data in the header conversion and OAM table if it is not the first FPM cell; A seventh step of transmitting the header-converted BR OAM cell in 64 bytes to the control unit and in 54 bytes to the transmitting side after performing the sixth step; An eighth step of, after performing the sixth step, transmitting the header-converted BR OAM cell by FMF to " FMF = 10 " A ninth step of transmitting the header-converted BR OAM cell to the control unit in 64 bytes if "FMF = 01" by the FMF after performing the sixth step; As a result of the determination in the third step, when the user cell is received instead of the end FPM OAM cell, it is checked whether the flag indicating whether the performance monitoring is activated and whether the MI is activated. A tenth step of counting cells, counting all received user cells, performing BIP-16 calculation, counting parity errors, and storing performance monitoring related OAM data in the header conversion and OAM table; And As a result of the determination of the third step, when receiving the BR OAM cell, when performing the header conversion to 64 bytes, the twelfth byte to the twelfth byte is set to 00 to indicate that the received BR OAM cell is transmitted to the controller. 11th Step Operation and maintenance method of the asynchronous delivery mode layer in an asynchronous delivery mode network comprising a. In an asynchronous delivery mode (ATM) layer operation and maintenance (OAM) device with a processor, Refer to header conversion and OAM table, The fault management processor generates an AIS cell according to the command of the controller and transfers it to the switch interface unit, converts the header when the fault management-related cell is input to the controller, and checks the continuity for the connection. A first function of detecting a failure and notifying the controller of the occurrence of a failure; And The performance monitoring processor performs a performance monitoring function upon receiving the forward performance monitoring OAM cell for the connection, generates a reverse performance reporting OAM cell, converts the generated header of the reverse performance reporting OAM cell, and sends it to the controller and the transmitting side. And a second function of converting a header of the received backward performance report OAM cell and transmitting the converted header to the controller. A computer-readable recording medium having recorded thereon a program for realizing this.