KR19980026750A - How to create forward performance monitoring and maintenance cells - Google Patents

Abstract

The present invention relates to a method for generating a forward performance monitoring operation and maintenance (OAM) cell in an asynchronous transmission mode (ATM) layer. In the asynchronous transmission mode transmission method, a virtual path identifier (VPI) and a virtual channel of an asynchronous transmission mode cell header are used. The network of virtual connection method that transmission path is determined by identifier (VCI) is composed, and operation and maintenance (OAM) function of asynchronous transmission mode layer for operation and maintenance of virtual connection of asynchronous transmission mode layer. Operational and maintenance processing of this asynchronous transport mode layer is performed using an operational and maintenance cell with information related to the virtual connections, and a forward performance monitoring operation and maintenance cell and reverse performance for performance monitoring of the virtual connections. The monitoring operation and maintenance cell is used, and for performance detection, transmission and reception between transmission and reception using the operation and maintenance cell first In calculating the number of cells and the block error detection code for each user cell, if the transmitting side transmits a cell of a block size already defined, the forward performance monitoring including the number of cells and the block error detection code calculation result of the cell When the operation and maintenance cell is sent and the forward performance detection operation and maintenance cell is input, the reception side sends the result of the comparison with the information of the forward performance monitoring operation and maintenance cell to the operation and maintenance cell. And a maintenance cell called a reverse performance detection operation and maintenance cell. The present invention provides a forward performance detection operation and maintenance cell generation control method performed when a transmitter sends a user cell having a configuration block size.

Description

How to create forward performance monitoring and maintenance cells

No content

In the existing forward performance monitoring operation and maintenance (OAM) cell generation, the cell buffer for the user cell transferred from the switch to the physical layer and the performance monitoring for the user cell, and then the forward performance monitoring operation and maintenance cell generated as a result of the performance detection. By using a buffer for the two buffers in the physical layer to selectively transfer the cell.

Two problems arise in the method, one of which is to prioritize the user cell buffer and deliver the cell to the physical layer, where the user cell is input from the switch and transferred to the physical layer, whereby the performance monitoring is performed. If the user cells of the block size set for the supervision-enabled connection are transmitted, a forward performance monitoring operation and maintenance cell should be created and the forward performance monitoring operation and maintenance cell transmitted to the physical layer after the last user cell of the block. .

However, there may be a problem of missing the bandit due to the priority of the user cell buffer.

The second problem is the opposite case, where the forward performance monitoring operation and maintenance cell buffers are prioritized, because the user cells in the block are waiting in the buffer prior to sending the last user cell of the block. Forward performance monitoring operation and maintenance cells can be delivered to the physical layer first.

Accordingly, the present invention is to solve the above-mentioned conventional problems, and to provide a method for generating a forward performance monitoring operation and maintenance cell without affecting the user cell flow using the proposed structure and flow.

1 is a schematic diagram of asynchronous transmission mode (ATM) subscriber hardware according to the present invention;

2 is a block diagram of a forward performance monitoring operation and maintenance (OAM) cell generation of the present invention;

3 is a diagram illustrating a structure of a performance monitoring information table of an asynchronous transmission mode (ATM) layer transmitter according to the present invention;

4 is a flow chart of a forward performance monitoring operation and maintenance (OAM) cell generation in accordance with the present invention;

5 is a structural diagram of a forward performance detection operation and maintenance (OAM) cell in accordance with the present invention.

Explanation of symbols on the main parts of the drawings

1: physical layer processing unit 2: asynchronous transmission mode layer processing unit

3: control unit 4: cell receiving unit

5: Performance monitoring unit 6: Connection identifier storage first in first out (FIFO)

7: Forward performance monitoring operation and maintenance (OAM) cell generation unit

8: Performance Monitoring Information Table

9: physical layer transmission unit

The present invention relates to a method for generating an operation and maintenance (OAM) cell in an asynchronous transfer mode (ATM) layer.

1 is an asynchronous transmission mode hardware configuration diagram applied to the present invention, the asynchronous transmission mode switch subscriber matching module is a physical layer processing unit (1) terminating the STM-1 interface, and the asynchronous transmission mode layer terminating the asynchronous transmission mode cell And a control unit 3 for controlling the physical layer and the asynchronous transmission mode layer processing unit.

The present invention is located in the transmission operation and maintenance processing section in the asynchronous transmission mode layer processing section (2).

In addition, the present invention relates to the performance monitoring during the operation and maintenance processing in the asynchronous transmission mode layer processing unit (2), the forward performance monitoring operation and maintenance cell after transmission of the user cell of the block set for any connection with the performance monitoring It is to provide a way to generate.

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

Figure 2 is a block diagram of the forward performance monitoring operation and maintenance cell generation of the present invention.

First, a cell receiver 4 which receives an internal type cell 11 and a shell connection identifier 12 from an asynchronous transfer mode (ATM) switch, and a performance monitor that monitors performance of the cell transmitted from the switch to the physical layer. (5), the performance monitoring information table (9) management unit for storing the performance monitoring information, and the forward performance monitoring operation and maintenance (OAM) cell when the user cell of the block size set for the connection where the performance monitoring is activated is transmitted. There is a connection identifier storage first in, first out (FIFO) section 6 for generation.

In addition, there is a physical layer transmitter 9 for transmitting a cell to a physical layer. When the cell is transmitted from the switch to the physical layer by a block size set for the connection where the performance monitoring is activated using the above-mentioned parts, It has a generation unit 7 for generating an economical forward performance monitoring operation and maintenance cell.

The cell receiving unit 4 receives from the outside the connection identifier 12 obtained from the cell of the internal cell 11 type and the virtual path identifier / virtual channel identifier (VPI / VCI) of the cell from the switch.

The inner cell 11 is a cell type used in the asynchronous transmission mode switch, and the connection identifier 12 is a connection unique number where the connection is activated in the current network node.

In addition, the size of the connection identifier 12 depends on the maximum connection means supported by the system.

The internal cell 11 input thereto is changed to the asynchronous transmission mode cell format, and the changed asynchronous transmission mode cell 17, the cell synchronization signal 16, the linkage identifier 14, and the transmission cell presence notification signal 15 )

The performance monitoring unit 5 transmits the asynchronous transmission mode cell 17, the cell synchronization signal 16, the connection identifier 14, and the transmission cell presence notification signal 15 output from the cell receiver 4. It is input from the cell receiver 4.

If there is an asynchronous transmission mode cell 17 transmitted from the switch to the physical layer, the accumulated performance monitoring information 18 of the corresponding connection identifier 14 in the performance monitoring information table 9 is read.

3 is a diagram illustrating the structure of a performance-sensing information table of the asynchronous transmission mode transmitter according to the present invention, wherein the performance monitoring initialization status bit 24 indicating whether the performance monitoring is activated among the performance sensing information 18 of FIG. ', The BIP-16 calculation result of the payload portion of the cell and the accumulated BIP-16 information and the logical exclusive OR (XOR) to update to a new cumulative BIP-16.

In addition, the first total user cell number (releated to CLP = 0, TUC0) 29, which is the cell number integration information, according to the CLP bits in the cell head, and the second total user cell number. 1 is added to (related to CLP = 0,1, TUC0 + 1) (28).

That is, if CLP = 0, 1 is added to each of the first total user cell number 29 and the second total user cell number 28, and if CLP = 1, only the second total user cell number 28 is added. Add 1

The new BIP-16 (30), the first total user cell number 29, and the second total user cell number 28, which are the new block error detection codes thus updated, are recorded in the performance monitoring information table 9. .

On the other hand, the value of the second total number of user cells (FTUC0 + 1) (31), which is information on the second total number of user cells recorded at the time of generating the previous forward performance monitoring operation and maintenance cells (28) When the difference between the current total number of user cells and the current number of second user cells 28 is the set block size (B / S) 27, the connection identifier waiting recording state (FS) 26 is checked from the performance monitoring information 18.

The connection identifier standby recording state 26 bit is '0' when the connection identifier storage first-in-first-out part 6 does not have a standby identifier for forward monitoring performance and maintenance cell generation, and a '1' when there is a standby identifier. .

When the connection identifier standby recording state 26 is '1', it indicates that the connection identifier 19 is recorded in the connection identifier storage first-in-first-out unit 6 for generating the forward echo monitoring and maintenance cell.

Therefore, it is not necessary to record the connection identifier 19 in the forward connection identifier storage first-in-first-out part (6).

If the wait identifier status information 26 is '0', '1' is recorded in the wait identifier status information 26, and the connection identifier 19 is first stored in an identifier for forward performance monitoring operation and maintenance cell generation. It records in the selection part 6.

In addition, the release to '0' for the standby identifier state information 26 is '0' after the forward performance monitoring operation and maintenance cell generation unit 8 generates the forward performance monitoring operation and maintenance cell 21. Release it.

4 is a flowchart illustrating a generation of a forward performance monitoring operation and maintenance cell according to the present invention, wherein the forward performance monitoring operation and maintenance cell generation unit 8 is a cell section in which no cell is transmitted to the physical layer (35). If there is a connection identifier 19 recorded in the identifier storage first-in-first-out (6) (26), the forward performance monitoring operation and maintenance cell generation identifier recorded in the identifier storage first-in-first-out is read.

After reading the identifier, the cell is generated (37) in the forward-looking performance monitoring operation and maintenance cell format with the performance monitoring result information 20 of the corresponding identifier of the performance monitoring table 9, and then forward performance monitoring to the physical layer transmitter. The operation and maintenance cell 21 is transmitted 38.

FIG. 5 is a diagram illustrating a structure of a forward performance monitoring operation and maintenance cell according to the present invention, wherein the first performance of the forward performance monitoring operation and maintenance cell 21 when the forward performance monitoring operation and maintenance cell 21 of FIG. 4 is generated. The total number of user cells (TUC0) 44, the second total number of user cells 42, and the first total number of user cells (FTUCO0) 31 at the time of forward performance monitoring operation and maintenance cell generation, and the forward performance monitoring Each of the second total user cells 32 at the time of operation and maintenance cell generation is recorded.

The BIP-16 (30) information, which is a block error detection code in the performance monitoring information table 9, is initialized to B "0000000000000000".

In addition, the virtual path identifier 39 which is the cell head information, the virtual channel identifier 40, and the connection information (segment / end-to-end 26) for generating the forward performance monitoring operation and maintenance cell 21, The connection type 25 is placed in the performance monitoring information table 9.

Forward performance monitoring operation and maintenance cell generation flow for the above is shown in FIG.

In the physical layer cell transmitter 9, the cell receiver 4 or the forward performance monitoring operation and maintenance cell generator are generated by the cell synchronization signal 16 and the cell existence notification signal 15 input from the cell receiver 4. (8) It determines whether to receive a cell and delivers it to the physical layer.

That is, if the cell presence notification signal 15 receives the cell by the cell receiver 4 when the logic level is '1', the cell generated by the forward performance monitoring operation and maintenance cell generator 8 when the logic level is '0'. If present, forwards the generated performance monitoring operation and maintenance cell 21 to the physical layer.

As described above, the asynchronous transmission mode forward performance monitoring operation and maintenance cell 21 can be generated.

The present invention is to create a forward performance monitoring operation and maintenance cell required for performance monitoring of the operation and maintenance (OAM) function performed to monitor the transmission status of the virtual connection in the asynchronous transmission mode (ATM) network and to detect a failure. Therefore, through the connection identifier storage buffer and proper control, it is possible to solve the above-mentioned problems caused by processing two cell buffers and to generate an accurate performance monitoring operation and maintenance cell.

The present invention is to create a forward performance detection operation and maintenance cell for performance monitoring of the operation and maintenance (OAM) function performed to monitor the transmission status of the virtual connection in the asynchronous transmission mode (ATM) network and to detect a failure. It is economical.

Claims (5)

A method for generating a forward performance monitoring operation and maintenance (OAM) cell in an asynchronous transmission mode (ATM) layer, Receiving an internal cell and a connection identifier used in the asynchronous transfer mode switch from an asynchronous transfer mode switch; Performing a performance monitoring on a cell transmitted from the switch to a physical layer; A third step of managing performance detection information for storing the performance detection information; A fourth step of storing a connection identifier in a first-in first-out manner to generate the forward performance monitoring operation and maintenance cell; And performing a fourth step of delivering the generated cell to the physical layer after performing the fourth step. The method of claim 1, wherein the first step A method for creating a forward performance monitoring operation and maintenance cell of an asynchronous transmission mode layer, characterized in that asynchronous transmission mode cell and connection identifier information are simultaneously inputted from the outside for performance monitoring in the asynchronous transmission mode layer. The method of claim 1, wherein the second step Method for generating a forward performance monitoring operation and maintenance cell of the asynchronous transmission mode layer, characterized in that using a first-in first-out (FIFO) buffer to hold the connection identifier. The method of claim 1, wherein the third step The forward performance monitoring operation and maintenance cell of the asynchronous transmission mode layer, which stores the virtual path identifier, the virtual channel identifier, and the connection information in the performance monitoring table, which are included in the generated forward performance monitoring operation and maintenance cell head. How to produce. The method of claim 1, wherein the fourth step Asynchronously characterized by storing the connection identifier in the first-in, first-out to wait for forward performance monitoring operation and maintenance cell generation by the transmission cell presence signal output from the receiver until there is no user cell transmission after the performance monitoring A method of generating forward performance monitoring operation and maintenance cells in the transport mode layer.