KR100226453B1 - An equipment and method for generating backward reporting monitoring cells in ATM interface module - Google Patents

Abstract

The present invention relates to an apparatus and method for generating a reverse monitoring cell in an ATM matching device, wherein an ATM matching device transmitting and receiving an arbitrary cell in a virtually connected state monitors user cells that are transmitted and received with each other to transmit a virtual connection. A method of generating a reverse monitoring cell at a receiving side to confirm performance, wherein when the receiving side receives a forward monitoring cell, only a connection identifier of the forward monitoring cell is transmitted to a control unit in an ATM matching device as a maintenance data of the system. It is used, and by reading the data of the memory required by the performance monitoring hardware to generate a reverse monitoring cell, it characterized in that the load of the control unit is reduced.

Description

An apparatus and method for generating backward reporting monitoring cells in ATM interface module

The present invention relates to an apparatus and a method for generating a reverse monitoring cell in an Asynchronous Transfer Mode (ATM) matching device. In particular, the present invention relates to a case in which a forward monitoring cell is received at a receiving ATM matching device. It transmits only the connection identifier of the forward monitoring cell to the control unit in the ATM matching device to use as the maintenance data of the system, and reads the data of the memory required by the performance monitoring control unit to generate the reverse monitoring cell, thereby reducing the load of the control unit. An apparatus and method for generating a reverse monitoring cell in an ATM matching device.

Since the ATM matching device transmits and receives an arbitrary cell in a virtually connected state with the counterpart matching device, a transmission performance monitoring function of the virtual connection state should be performed when transmitting and receiving a cell.

Accordingly, in order to perform such a monitoring function, the ATM matching device first activates the performance monitoring function through a separate procedure and then performs the performance monitoring procedure. In the performance monitoring activation procedure, the direction of the performance monitoring and the block for the performance monitoring are performed. Determine the size, etc.

After the performance monitoring activation procedure, the sender counts cells according to the type of user cell transmitted to the other party, and checks an error block (BIP-16: Bit Interleaved Parity-16) for checking the error performance of the payload interval of the user cell. Calculate When more cells than the set block are transmitted, the forward monitoring cell is generated using the time for which the user cell is not transmitted and transmitted to the receiver, thereby transmitting the performance monitoring parameter monitored by the transmitter to the receiver. At this time, the block size is not constant because the forward monitoring cell is not transmitted immediately after the user cell of the block size is transmitted.

Then, the receiving side receiving the forward monitoring cell performs the performance monitoring on the received cells as in the transmitting side, and when receiving the forward monitoring cell, the parameters received through the monitoring cell and the receiving side monitor themselves. By comparing the parameters, the transmission performance of the corresponding virtual connection is obtained, and the obtained transmission performance monitoring result is transmitted to the transmitter through the reverse performance report cell. The sender receives the backward performance report cell and checks the performance of the virtual connection that it is transmitting.

This series of connection performance monitoring process will be described with reference to FIG.

1 is a process flow diagram for performance monitoring of an ATM subscriber matching device.

Referring to FIG. 1, in the performance monitoring process of the ATM subscriber matching device, first, the ATM subscriber matching devices of the transmitting side and the receiving side perform the performance monitoring activation procedure (S101), and then count user cells to be transmitted from the transmitting side. (S102), the error performance of the user cell to be transmitted is confirmed (S103), and a forward monitoring cell is generated based on the information and transmitted to the receiver (S104), and the receiver monitors the performance of the received user cell ( In step S105, the transmission performance of the connection is obtained by comparing the parameters of the forward monitoring cell with the self-monitoring parameter (S106), and a backward monitoring cell is generated based on this information and transmitted to the transmitting side (S107).

However, in the conventional ATM matching device performance monitoring method as described above, the performance monitoring of the reception connection is performed by the hardware and stores the result in a memory, and when receiving the forward monitoring cell, the received forward monitoring cell is transferred to the controller. The controller analyzes the forward monitoring cell, reads the performance monitoring result from the receiver, creates a reverse performance monitoring report cell, and sends it to the sender.

Therefore, when the load of the controller is large and the size of the performance monitoring block is small, the monitoring cell is frequently received, and thus the monitoring cell may not be processed or other functions that the controller must perform may occur depending on the performance of the controller. have.

Therefore, in the present invention, when the receiving side receives the forward monitoring cell, the entire forward monitoring cell is not transmitted to the controller, but only the connection identifier that receives the forward monitoring cell is transmitted to the controller. Read data from memory to reflect the results of the performance monitoring into system maintenance, and reverse performance reporting cells are generated in hardware and passed back through the loop back buffer to the sender to reduce the load on the controller and reverse in real time. An apparatus and method for generating a reverse monitoring cell in an ATM matching device capable of generating a performance report cell are provided.

The apparatus for generating a reverse monitoring cell provided by the present invention reads a cell transmitted from another subscriber, extracts a connection identifier, distinguishes and outputs a connection type, and connects the received connection identifier management means from the received connection identifier management means. Receiving cell monitoring means for classifying the cell data by receiving an identifier, a connection type, and cell data, and generating and outputting a reverse monitoring cell when receiving a forward monitoring cell from a transmitter; and a cell output from the receiving cell monitoring means And buffer means for storing data information for each type.

Meanwhile, the method provided by the present invention reads a cell transmitted from a transmitting side, extracts a connection identifier, distinguishes a connection type, and classifies cell data, and the classification result transmitting unit of the first step. A second step of reading the received cell management table using the connection identifier if the transmitted cell is a user cell and storing the contents in a user cell buffer, and if the cell is a managed cell, storing the contents in a management cell buffer; If the cell transmitted from the transmitting side is the forward monitoring cell, only the connection identifier is output to the connection identifier buffer, and the performance monitoring result of the user cell and the performance monitoring result of the forward monitoring cell are updated in the reception cell performance monitoring table. The reverse monitoring is performed by combining the contents of the forward monitoring cell and the contents of the receiving cell performance monitoring table. And a fourth step of generating a cell, and a fourth step of outputting a reverse monitoring cell generated in the third step to a loopback buffer.

1 is a flowchart illustrating a performance monitoring of an ATM subscriber matching device;

2 is a block diagram of an ATM subscriber matching device;

3 is a block diagram of a reception cell processing unit according to an embodiment of the present invention;

4 is a block diagram of a receiving cell monitoring unit according to an embodiment of the present invention;

5 is a block diagram of a reception cell management table according to an embodiment of the present invention;

6 is a block diagram of a reception cell performance monitoring table according to an embodiment of the present invention;

7 is a block diagram of a reverse monitoring cell according to an embodiment of the present invention;

8 is a process flow diagram for reverse performance monitoring according to an embodiment of the present invention;

9 is a process flow diagram for generating a reverse monitoring cell according to an embodiment of the present invention;

10 is a process flow diagram for reverse performance reporting in accordance with an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

1: subscriber line 2: physical layer processing unit

3: receiving cell processing section 4: transmitting cell processing section

5 switch link matching unit 6 switch link

7: control unit 8: control bus

9: receiving connection identifier management unit 10: receiving cell monitoring unit

11: user cell buffer 12: management cell buffer

13: connection identifier buffer 14: loopback buffer

15: receiving cell 16: connection identifier

17: Connection Type 18: Cell Data

19: user cell 20: management cell

21: forward monitoring cell receiving connection identifier

22: reverse monitoring cell 23: cell input

24: cell output unit 25: table control unit

26: receiving cell management table 27: receiving cell performance monitoring table

28: receiving cell monitoring circuit

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.

2 is a block diagram of an ATM subscriber matching apparatus, FIG. 3 is a block diagram of a receiving cell processing unit according to an embodiment of the present invention, and FIG. 4 is a block diagram of a receiving cell monitoring unit according to an embodiment of the present invention. 5 is a block diagram of a receiving cell management table according to an embodiment of the present invention, FIG. 6 is a block diagram of a receiving cell performance monitoring table according to an embodiment of the present invention, and FIG. 8 is a block diagram of a reverse monitoring cell according to an embodiment, FIG. 8 is a flowchart illustrating a reverse performance monitoring according to an embodiment of the present invention, and FIG. 9 is a flowchart illustrating a reverse monitoring cell generation according to an embodiment of the present invention. 10 is a process flow diagram, and FIG. 10 is a process flow diagram for a reverse performance report according to an embodiment of the present invention.

Referring to FIG. 2, the ATM subscriber matching apparatus includes a physical layer processor 2 for directly exchanging data with a subscriber line 1, a reception cell processor 3 for processing a cell received from the physical layer processor, and A transmission cell processing unit 4 for processing a cell to be transmitted to a physical layer processing unit, a switch link matching unit 5 for matching between the reception cell processing unit 3 or the transmission cell processing unit 4 and the switch link 6, It is composed of a control unit 7 for controlling the function of each of the components (2, 3, 4, 5).

The physical layer processing unit 2 restores the data and the clock from the signal received from the subscriber line 1, extracts the frame according to the type of the subscriber line 1, processes the frame, and then extracts the ATM cell to receive the received data. After transmitting the cell to the cell processing unit 3 or generating the frame according to the type of the subscriber to the ATM cell received by the transmitting cell processing unit 4, the ATM cell is loaded on the frame to the subscriber via the subscriber line (1). At this time, the types of subscriber line include E1 class subscriber having a line speed of 2.048Mbps, DS-3 class subscriber having a transmission rate of 44.736Mbps, and STM-1 class subscriber having a transmission rate of 155.520Mbps. Can be.

When the receiving cell processor 3 is informed that the cell has been received from the physical layer processor 2, the corresponding physical layer processor 2 reads and multiplexes the cell and uses the received connection information to receive the header of the received cell. After converting, transfer to the switch link matching section 5 and performs the performance monitoring of the incoming connection to inform the controller 7 of the result. In addition, the reverse performance report cell is generated and transmitted to the transmitting cell processor 4 through the loop back buffer.

The switch link matching unit 5 which has received the cell from the receiving cell processing unit 3 converts the cell into a form used by the switch link 6 and transmits the cell to the switch link 6. On the other hand, upon receiving the cell from the switch link 6, it transmits the cell to the transmitting cell processing section 4.

The transmitting cell processor 4 multiplexes the user cell received from the switch link matching unit 5, the management cell received from the controller 7, and the reverse performance report cell received from the receiving cell processor 3. The output line is selected according to the transmission connection information, and the cell is transmitted to the corresponding physical layer processing unit 2.

On the other hand, the control unit 7 manages the state of the physical layer processing unit 2, manages the reception connection information in the reception cell processing unit 3, and manages the transmission connection information of the transmission cell processing unit 4.

3 is a block diagram of a reception cell processing unit according to an embodiment of the present invention. Referring to FIG. 3, the reception cell processing unit 3 extracts and manages a connection identifier of a received cell. Switch link matching between the reception cell monitoring unit 10 for receiving information from the reception connection identifier management unit 9 and monitoring the performance, and the user cell 19 among the output signals of the reception cell monitoring unit 10. The monitoring result is controlled by the user cell buffer 11 to be transmitted to the unit 5, the management cell buffer 12 to deliver the management cell 20 to the control unit 7, and the forward monitoring cell receiving connection identifier. ) And a loop back buffer 14 for transmitting the reverse performance report cell 22 to the transmitting cell processor 4.

When the reception connection identifier management unit 9 receives a cell reception notification from each physical layer, the reception connection identifier management unit 9 outputs a buffer read signal to a cell buffer in the corresponding physical layer to read the reception cell 15 from the cell buffer of the corresponding physical layer, The connection identifier 16 is extracted by referring to the VPI and VCI to receive the connection identifier 16, a connection type 17 indicating whether the connection is a virtual path connection or a virtual channel connection, and the cell data 18. Transfer to cell monitoring unit 10.

Then, the reception cell monitoring unit 10 classifies whether the cell received from the reception connection identifier management unit 9 is a user cell, an operation and maintenance (OAM) cell, or a signal processing cell. In the case of 19), the header transformation of the cell is performed and routing information is added and stored in the user cell buffer 11, and in the case of the OAM cell, the terminal should be terminated after determining whether to terminate or forward the cell. The cell 12 is outputted to the management cell buffer, transferred to the controller, and forwarded to the user cell buffer 11 by the same processing procedure as that of the user cell 19. When the monitoring of the OAM cell is requested, it is output to the management cell buffer 12 and also to the user cell buffer 11.

However, if the received OAM cell is a forward monitoring cell when the OAM cell needs to be terminated, only the connection identifier 21 is output to the connection identifier buffer 13 instead of being output to the management cell buffer 12 to monitor the corresponding connection forward. The control unit 7 notifies that only the cell has been received. The reverse performance report cell 22 generated using the forward monitoring cell is output to the loop back buffer 14 and transmitted to the transmission cell processing unit 4.

4 is a block diagram of a reception cell monitoring unit according to an embodiment of the present invention. Referring to FIG. 4, the reception cell monitoring unit 10 monitors the performance of a reception cell. And a reception cell management table 26 for managing the reception cell, and a reception cell performance monitoring table 27 for managing the performance of the reception cell monitored by the reception cell monitoring circuit. Table for controlling the cell input unit 23 for processing the input of the cell, the cell output unit 24 for processing the output of the cell, the receiving cell management table 26 and the receiving cell performance monitoring table 27 It consisted of the control part 25.

The signal transmitted from the table control unit 25 to the receiving cell performance monitoring table 27 includes performance monitoring table selection signals 33 and 34, a table address 31 and table data 32. The signal transmitted from the receiver 25 to the receiver cell management table 26 includes the receiver cell management table selection signal 29, the receiver cell management table write signal 30, the table address 31, and the table data 32. have.

At this time, the receiving cell monitoring unit 10 is configured as a Field Programmable Gate Array (FPGA), and the receiving cell management table 26 and the receiving cell performance monitoring table 27 include a receiving cell monitoring circuit ( The dual port random access memory (DPRAM) is configured to allow both the 28 and the control unit 7 to read and write at the same time.

Meanwhile, the reception cell management table 26 has connection information for each connection, and as shown in FIG. 5, a performance monitoring reference address area 35 referred to by a connection identifier and referring to the reception cell performance monitoring table. And a routing information area 36 to which the receiving cell is to be routed, a type information area 37 for terminating or advancing the received OAM cell, and an output VPI indicating information about a path to which the receiving cell is output. A Virtual Path Interface (38) information area (38), an output VCI (virtual path interface) information area (39) indicating information about a channel to which a receiving cell is output, a receiving cell counter area (40) for counting receiving cells, A violation cell counter area 41 for counting user parameter violation cells, a continuity check activation bit area 43, and a continuity check counter area 42 for counting continuity checks.

The cell input unit 23 of the reception cell monitoring circuit 28 receives a connection identifier 16, a connection type 17, and a cell data 18 signal from the reception connection identifier manager 9 of FIG. 3. The data 18 is transmitted to the cell output unit 24 and the remaining signals are transmitted to the table control unit 25.

The cell output unit 24 uses the cell data and connection information received from the table control unit 25 and the cell input unit 23 to forward the cell between the user cell 19 and the OAM cell. If the cell is output to (11) and the terminal should be terminated among the OAM cells or not the forward monitoring cell, the cell is output to the management cell buffer 12, and when the forward monitoring cell is received, the table control unit 25 generates the cell. The reverse performance report cell 22 outputs to the loop back buffer 14.

The performance monitoring table 27 stores performance monitoring information for each connection. The configuration includes an activation bit area (A) 67 indicating whether the performance monitoring function is activated as shown in FIG. The previous block error area (BLER) 44 indicating the block error number of the block, the sequence number area (MCSN) 45 for recording the sequence number of the forward monitoring cell to be received next, and the transmission through the previous forward monitoring cell Previous transmission cell count area (FTUCC (0 + 1)) 46 indicating the total number of transmitted cells transmitted by the side, and previous receiving cell indicating the number of all user cells received until the previous forward monitoring cell was received. The number area (formerly RTUCC (0 + 1)) 47, the total number of received cells indicating the total number of user cells received so far (RTUCC (0 + 1)) 48, and the block currently being monitored Cumulatively calculated parity area for payload intervals (BI P-16) 49, an area (RTUCC (0)) 50 indicating the number of user cells whose cell loss priority (CLP: Cell Loss Priority) is 0 among the user cells received so far, and a forward monitoring cell The number of cells (FTUCC (0)) 51 of the transmitted CLPs of the transmitted user cells transmitted by the sender through the UE and the cells having the CLP of 0 among the received user cells until the previous forward monitoring cell is received. Number region (formerly RTUCC (0)) 52.

The configuration of the reverse monitoring cell generated in the apparatus of the present invention as shown above is shown in FIG. Referring to FIG. 7, an ATM cell header area 53 of 5 octets representing a cell header of an ATM, and a 4-bit OAM cell format (OAM) indicating an OAM cell format. Type area 54, a 4-bit OAM cell function (Fn Type) area 55 indicating the function of the OAM cell, and an 8-bit monitoring cell number (MSCN) area 56 indicating the serial number of the monitoring cell. ), A 16-bit first transmit cell number area (TUC (0 + 1)) 57 representing the total number of transmitted cells transmitted from the transmitting side through the forward monitoring cell, and a block error protection code. 16-bit second transmission cell indicating the number of 16-bit error code area (BEDC (0 + 1)) 58 and a cell whose CLP is 0 among the transmitted cells transmitted by the transmitting side through the forward monitoring cell. A number area (TUC (0)) 59, a 16-bit first received cell number area (TRCC (0)) 62 indicating the number of cells whose CLP is 0 among the total user cells received so far, Block error An 8-bit error result area (BLER) 63 indicating a result of the &quot;, &quot; a 16-bit second reception cell number area (TRCC (0 + 1)) 64 indicating the total number of user cells received so far, and A 10-bit error protection region (EDC) 66 representing an error protection code, optionally including a 32-bit time stamp region 60, and 29 octets of unused. An unused area 61 and a 6-bit unused area 65.

8 is a flowchart illustrating a reverse performance monitoring of the present invention. Referring to FIGS. 2, 3, and 8, first, a reception connection identifier of the receiving cell processing unit 3 is performed for the reverse performance monitoring of the present invention. When the management unit 9 reads a cell from the physical layer processing unit 2, extracts a connection identifier, distinguishes a connection type, and outputs the result (S801), the receiving cell monitoring unit 10 receives the received cell data. Classify (S802).

After checking whether the cell data is an OAM cell (S803), and if the user cell is not an OAM cell, the received cell management table is read using the connection identifier and stored in the user cell buffer 11 (S811). (S812), and if it is an OAM cell, it is determined whether or not to terminate the cell (S804). If not, the cell is performed in the same manner as in the case of the user cell (S811, S812). It is checked whether one cell data is a forward monitoring cell (S805). If the cell data is not a forward monitoring cell, the reception cell is output to the management cell buffer 12 (S808) and then transmitted to the control unit 7.

If the forward monitoring cell is received in the step of checking the forward monitoring (S805), only the connection identifier is output to the connection identifier buffer 13 (S806), and then transmitted to the control unit 7 (S807), and the reverse monitoring cell. After generating the output to the loopback buffer 14 (S809) and transmits to the transmitting cell processing unit (4) (S810).

At this time, the reverse monitoring cell generation process is shown in FIG. Referring to FIG. 9, first, the control unit 7 notifies that the performance monitoring function is activated in the performance monitoring table (S901), and updates the performance monitoring result of the user cell received by the receiving side in the reception cell performance monitoring table (S902). After updating the performance monitoring result of the received forward monitoring cell to the performance monitoring table (S903), the reverse monitoring cell is generated by combining the contents of the received forward monitoring cell and the contents of the receiving cell performance monitoring table (S904). do.

In more detail, the control unit 7 informs that the performance monitoring function is activated (S901) in the performance monitoring table at the performance monitoring reference address 35 of the reception cell management table 26 of the connection. Write the start address of the unused block, set the first bit of the memory pointed to by this address to '1', and initialize all remaining fields to zero.

Then, in order to update (S902) the performance monitoring result of the user cell received by the reception side to the reception cell performance monitoring table, when the user cell is received, the reception cell monitoring circuit 28 determines that the reception cell performance monitoring table 27 Each field (see FIG. 6) is updated according to the performance monitoring result. The RTUCC (0 + 1) 48 is updated with an increment of 1 each time a user cell is received. It increments by 1 only when the CLP of the received user cell is 0, and does not increase when CLP is 1. In addition, the BIP-16 49 accumulates and records the BIP-16 value up to the previous cell and the BIP-16 value of the newly received cell.

Each time the user cell is received, the above function is repeatedly performed, and when the forward monitoring cell is received from the counterpart, the performance monitoring result of the received monitoring cell is updated in the forward performance monitoring table 27 (S903). The received TUC (0 + 1) and FTUCC (0 + 1) are checked to see if the MCSN of the received monitoring cell matches the MCSN (45) of the performance monitoring table of the connection, and to check if the size of the performance monitoring block matches. It is checked whether the difference of 46 and the difference between the RTUCC (0 + 1) 48 and the previous RTUCC (0 + 1) 47 match.

If both of them are matched, the data of BEDC (0 + 1) and BIP-16 (49) are compared and the number of different bits are counted and written to BLER 44. If either does not match, the bits of BLER 44 are filled with 1s without comparing BIP-16.

In addition, the MCSN 45 adds 1 to the MCSN of the received forward monitoring cell and rewrites it, and the FTUCC (0 + 1) 46 and FTUCC (0) 51 write TUC (0 + 1) of the forward monitoring cell. And TUC (0), and change to the values of RTUCC (0 + 1) (48) and RTUCC (0) (52) in the previous RTUCC (0 + 1) (48) and the previous RTUCC (0) (52). After that, the BIP-16 (49) is initialized to zero.

Then, the corresponding connection identifier is output to the connection identifier buffer 13 and the control unit 7 notifies that the performance monitoring procedure for one block of the connection is completed, and then generates a reverse monitoring cell (S904).

At this time, the configuration of the generated reverse monitoring cell is the same as the configuration of the forward monitoring cell, ATM cell header 53, OAM Type (54), MCSN (56), TUC (0 + 1) (57) of the reverse monitoring cell ), BEDC (0 + 1) (58), TUC (0) (59), TSTP (60), etc. output the received performance monitoring cell as it is, and Fn Type (55) displays the reverse performance report cell. The value is changed to B0001, and RTUCC (0) (50) of the performance monitoring table is recorded in TRCC (0) 62, and BLER (44) of the performance monitoring table is recorded in BLER63, and TRCC (0 + 1). 64, RTUCC (0 + 1) 47 is recorded and output. After that, when the user cell is input, the performance monitoring for the reception connection is repeatedly performed in the above-described manner.

10 is a flowchart illustrating a reverse performance report according to an embodiment of the present invention. Referring to FIG. 10, the controller 7 reads a connection identifier for reporting performance from the connection identifier buffer 13 (S111). In step S112, the performance monitoring reference address of the reception cell management table 26 is read using the connection identifier (S112), and the performance monitoring result of the performance monitoring table is read (S113). Then, the performance monitoring results are reported to the upper level or utilized as maintenance data of the system (S114).

As described above, the present invention is not assisted by a controller in generating a reverse performance report cell required for performance monitoring among maintenance (OAM) functions performed to monitor a transmission status of a virtual connection and detect a failure in an ATM network. It reduces the load on the controller by looping back the performance reporting cell in real time in hardware and using the receiving cell monitoring circuit, the receiving cell management table, and the performance monitoring table. There is an advantage in that an efficient performance monitoring apparatus can be provided by performing real-time monitoring in an update manner.

Claims (10)

Receiving connection identifier management means for reading a cell transmitted from another subscriber, extracting a connection identifier, distinguishing a connection type, and outputting the connection identifier; Receiving cell monitoring means for receiving the connection identifier, the connection type and the cell data from the receiving connection identifier managing means, classifying the cell data, and generating and outputting a reverse monitoring cell when receiving a forward monitoring cell from the transmitting side; And a buffer means for storing cell data information output from the receiving cell monitoring means for each type. The method of claim 1, The receiving cell monitoring means A reception cell management table for storing connection information of cells transmitted from other subscribers; A receiving cell performance monitoring table that stores information about the performance of each connection of the received cell; The reception cell performance monitoring table is updated based on the connection identifier transmitted from the reception connection identifier management means, and when the forward monitoring cell is received from the transmitting side, only the connection identifier of the cell is stored in the buffer means. An apparatus for generating a reverse monitoring cell in an ATM matching device, comprising: a reception cell monitoring circuit configured to compare a content of a cell performance monitoring table with a value of the forward monitoring cell to generate and output a reverse monitoring cell related to its performance . The method of claim 2, The receiving cell management table Referenced by the connection identifier, A performance monitoring reference address area referencing the receiving cell performance monitoring table; A routing information area to which a receiving cell should be routed; A format information field for terminating or advancing the received monitoring cell; An output virtual path interface (VPI) information area indicating information on a path to which a receiving cell is output; An output VCI (Virtual Path Interface) information area indicating information on a channel to which a receiving cell is output A reception cell counter area for counting reception cells; A violation cell counter area for counting user parameter violation cells; A continuity check enable bit region, And a continuity check counter region for counting continuity checks. The method of claim 2, The receiving cell performance monitoring table An activation bit area A indicating whether the performance monitoring function is activated; A previous block error area (BLER) indicating the number of block errors of the previous block being monitored; A sequence number field (MCSN) for recording a sequence number of a forward monitoring cell to be received next; A previous transmit cell number area (FTUCC (0 + 1)) indicating the total number of transmitted cells transmitted by the sender through the previous forward monitoring cell, The previous Received Cells number field (formerly RTUCC (0 + 1)), which indicates the number of all user cells received until the previous forward monitoring cell was received; A total number of received cells (RTUCC (0 + 1)) indicating the total number of user cells received so far, and Cumulative calculated parity area (BIP-16) for the payload interval of the block currently being monitored; An area indicating the number of user cells whose CLP is 0 among the user cells received so far (RTUCC (0)), The number region (FTUCC (0)) of the cells whose CLP is 0 among the transmitted user cells transmitted from the transmitting side through the forward monitoring cell, An apparatus for generating a reverse monitor cell in an ATM matching device, characterized in that it comprises a number region (formerly RTUCC (0)) of cells whose CLP is 0 among the received user cells until the previous forward monitoring cell is received. The method of claim 1, The buffer means A user cell buffer for storing user cells, A management cell buffer for storing the management cell; A connection identifier buffer for storing only forward monitoring cell receiving connection identifiers; And a loopback buffer configured to store the reverse monitoring cell. In the method of generating a reverse monitoring cell at the receiving side to check the transmission performance of the virtual connection by monitoring the user cell that the ATM matching devices that transmit and receive arbitrary cells in a virtually connected state, When the receiving side receives the forward monitoring cell Only the connection identifier of the forward monitoring cell is transmitted to the control unit in the ATM matching device, and the control unit reads the data in the required memory by referring to the connection identifier, reports the data to the upper level, and generates a reverse monitoring cell in hardware, thereby loading the load of the control unit. Generating a reverse monitoring cell in an ATM matching device. A control unit for reading and storing the transmitted cell or monitoring transmission performance, a reception cell management table for managing connection information of the cell when the transmitted cell is a user cell, and reception cell performance monitoring for managing the performance monitoring result of the control unit A method of generating a reverse monitoring cell with a table, the method comprising: A first step of extracting a connection identifier by reading a cell transmitted from a transmitter, classifying a connection type, and classifying cell data; If the cell transmitted from the transmitting result of the first step is a user cell, the received cell management table is read using the connection identifier and stored in the user cell buffer. If the cell is a managed cell, the content is stored in the management cell buffer. The second step of storing, If the cell transmitted from the first stage classification result is the forward monitoring cell, only the connection identifier is output to the connection identifier buffer, and the performance monitoring result of the user cell and the performance monitoring result of the forward monitoring cell are monitored. A third step of generating a backward monitoring cell by combining the contents of the forward monitoring cell and the contents of a receiving cell performance monitoring table after updating the table; And a fourth step of outputting the backward monitoring cell generated in the third step to the loopback buffer. The method of claim 7, wherein The second step is If your cell is received 1 is increased to an area (RTUCC (0 + 1)) for storing the total number of received cells of the received cell performance monitoring table, and if the CLP of the received user cell is 0 or 1, the CLP is 0. The received cell is incremented by incrementing 1 in the area where RUCC (0) accumulates a value of 0 and accumulating the newly received parity value in the parity value accumulated up to the previous cell stored in the parity area BIP-16. A method of creating a reverse monitoring cell in an ATM matching device, characterized by updating a performance watchdog table. The method of claim 7, wherein The third step is Checks whether the sequence number area (MCSN) of the received forward monitoring cell and the sequence number area (MCSN) of the receiving cell performance monitoring table of the connection match, and whether the size of the performance monitoring block is identical, If both test results match, Receive cell performance by comparing the value of the error code area BEDC (0 + 1) of the forward monitoring cell with the value of the parity area BIP-16 of the receiving cell performance monitoring table and counting the number of different bits. Write to the previous block error area (BLER) of the watch table, If any of the above test results do not match, A thirty first step of recording all bits of a previous block error area BLER of the received cell performance monitoring table as '1'; A thirty-second step of incrementing 1 to a value of a sequential number field MCSN of the received cell performance monitoring table; The total number of transmitted cells of the forward-monitoring cell in the previous transmission cell number area FTUCC (0 + 1) of the receiving cell performance monitoring table and the number area of the cells transmitted with CLP 0 (FTUCC (0)) A thirty-third step of recording the value of the number area (TUC (0 + 1)) and the value of the number area (TUC (0)) of the cells whose CLP is 0 among the transmitted cells of the forward monitoring cell; In the previous reception cell number area (formerly RTUCC (0 + 1)) of the reception cell performance monitoring table, the value of the total reception cell area (RTUCC (0 + 1)) is recorded, and a cell whose CLP is 0 among the previous reception cells. A thirty-fourth step of recording a value of the cell number area (RTUCC (0)) in which the CLP is 0 among the total reception cells; And updating the receiving cell performance monitoring table, including the step 35 of initializing the parity area BIP-16 of the receiving cell performance monitoring table to 0. . The method of claim 7, wherein The reverse monitoring cell generated in the third step is An ATM cell header area of 5 octets representing an ATM cell header, A 4-bit OAM Type area indicating the type of monitoring cell, 4-bit monitoring cell function (Fn Type) area indicating the function of the monitoring cell, An 8-bit monitoring cell number (MSCN) area indicating the serial number of the monitoring cell, A 16-bit first transmit cell number area (TUC (0 + 1)) indicating the total number of transmitted cells transmitted by the transmitting side through the forward monitoring cell, 16-bit error code area (BEDC (0 + 1)) indicating a block error protection code, A 16-bit second transmit cell number area (TUC (0)) indicating the number of cells whose CLP is 0 among the transmitted cells transmitted from the transmitter through the forward monitoring cell, A 16-bit first received cell number area (TRCC (0)) indicating the number of cells having a CLP of 0 among the total user cells received so far, An 8-bit error result area (BLER) indicating the result of the block error, A 16-bit second received cell number area (TRCC (0 + 1)) indicating the total number of user cells received so far, It consists of a 10-bit error protection area (EDC) that represents an error protection code. The ATM cell header area, the monitoring cell type area (OAM Type) area, the monitoring cell number (MCSN) area, the first transmission cell number area (TUC (0 + 1)), and an error code area; (BEDC (0 + 1)) and the value of the received forward monitoring cell are applied to the second transmission cell number area (TUC (0)) as it is, '0001' is recorded in the monitoring cell function (Fn Type) area, The value of the reception cell number area (RTUCC (0)) in which the CLP of the reception cell performance monitoring table is 0 is recorded in the first reception cell number area (TRCC (0)), and the reception result is received in the error result area (BLER). The value of the previous block error area BLER of the cell performance monitoring table is recorded, and in the second number of receiving cell areas TRCC (0 + 1), the total number of reception cell areas of the receiving cell performance monitoring table (RTUCC (0)) is recorded. And generating a reverse monitoring cell in the ATM matching device, recording the value of +1)).

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