KR100258564B1 - Data processing method of atm - Google Patents

Abstract

PURPOSE: A method for processing data of an ATM system is provided to adaptively process each one of cell data according to an operation state of a host for processing substantial ATM cell data, so as to prevent overload of the host and data loss. CONSTITUTION: If many cell data for many packets are received in an ATM module, an ATM system records packet information on each packet. The ATM system assigns a memory area for storing the cell data, and stores the received cell data. If a final one of the cell data is received for an optional packet while the cell data are stored, the ATM system records a processing bit for processing the packet information in a packet information-stored area relating to the optional packet. The ATM system transmits an interrupt signal for processing the cell data relating to the optional packet to a host, and repeats the process after the step of recording the packet information. If the packet information for the optional packet is read and the cell data for the optional packet are processed, the ATM system deletes the packet information and the processing bit relating to the optional packet.

Description

How to handle data in an asynchronous transfer mode system

The present invention relates to an exchange for an asynchronous transfer mode (hereinafter referred to as ATM), and more particularly, to a data processing method of an asynchronous transfer mode system suitable for efficiently processing a plurality of ATM cell data transmitted from the outside. It is about.

In general, ATM is a communication scheme for implementing a broadband integrated service digital network, and is a special type of packet message transfer scheme using Asynchronous Time Division Multiplex (ATDM).

Meanwhile, in BISDN, information is transmitted between terminals by a continuous flow of packets having a certain size. The packets of fixed size are called ATM cells. More specifically, the ATM cell is information obtained by dividing a plurality of inputted service information into short-length cells of fixed length and packetizing each cell by attaching 5 bytes of header information to each cell. 53 bytes (paid load information 48 + header information 5), and each of these ATM cells is multiplexed and transmitted to a target terminal through a transmission channel.

In addition, as described above, the ATM cell is a connectivity method, and establishes a virtual channel to transmit service information. Whenever the virtual channel is established, an identification number for connection is given and the identification number is released together when the connection is released. do.

At this time, the main function of the 5-byte cell header information added to the ATM cell is to identify cells belonging to the same virtual channel among ATM cells existing in the asynchronous time division modulated (ATDM) information flow.

Such a general ATM receiver divides and receives the 53-byte ATM cell as described above. When the last cell is received, data processing is performed for the entire packet.

That is, until the last cell is transmitted, each cell transmitted from the receiving side receiving the ATM cell data is stored in a memory area of a host (for example, a terminal or a personal computer (PC)) that processes each cell data. After the last cell is received, each cell data is processed into one completed packet. At this time, the receiving side receiving the ATM cell receives information on the transmitted packet, that is, a cyclic redundancy check (CRC). ) Information on error, congestion, cell priority, and Abort signal is stored in the local memory of the receiver.

When the last cell for the packet is received, the above-described information and interrupt signals are generated and transmitted to the host for processing the actual ATM cell, thereby processing each ATM cell of the packet.

However, in this asynchronous transmission mode system, each packet data for a plurality of channels is divided into a plurality of cells, and a plurality of cells are also received discontinuously, so that the last packet for a plurality of channels is transmitted to the host every time. When transmitting, there is a problem in that an overload of the host occurs, and there is a problem in that data loss occurs accordingly.

Accordingly, the present invention is to solve the above-mentioned problems of the prior art, even if the last cell for each packet is received in the process of receiving an ATM cell, the information on each packet is stored at the receiving side and is stored in the host state. Accordingly, an object of the present invention is to provide a data processing method of an asynchronous transmission mode system capable of adaptively transmitting packet information to process cell data for each packet.

In order to achieve the above object, the present invention provides an ATM module for receiving cell data for a plurality of packets received from the outside, and separating and writing information on each packet into a predetermined area of a memory unit. A data processing method of an asynchronous transmission mode system including a host for storing and processing the data, the method comprising: when a plurality of cell data for a plurality of packets is received by the ATM module, a first packet for recording packet information for each packet; step; A second step of allocating a memory area for storing the plurality of cell data to store the received cell data; During the storing of the plurality of received cell data, when the last cell data for any one of the packets is received, a processing bit for processing the packet information is stored in an area where the packet information for the arbitrary packet is stored. A third step of recording; A fourth step of transmitting an interrupt signal for processing a plurality of cell data for the arbitrary packet to the host and repeating the process after the first step; A fifth step of deleting packet information and processing bits for the arbitrary packets when packet information for the arbitrary packets is read and a plurality of cell data for the arbitrary packets have been processed. Provides a data processing method.

1 is a block diagram of an asynchronous transmission mode system suitable for applying a data processing method according to a preferred embodiment of the present invention;

2 is a view for explaining a data processing method of an asynchronous transmission mode system according to an embodiment of the present invention;

3 is a flowchart illustrating a data processing procedure of an asynchronous transmission mode system according to a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

110: cell receiver 120: local memory

130: interface unit 210: control unit

220: memory unit

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings.

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

1 is a block diagram suitable for applying a data processing method of an asynchronous transmission mode receiver according to a preferred embodiment of the present invention, and includes an ATM having a cell receiver 110, a local memory 120, and an interface unit 130. The host 200 includes a receiving module 100, a control unit 210, and a memory unit 220.

ATM module 100 is generally configured in the form of a card containing an ATM chip (mounted to each host (for example, a terminal or a personal computer)), which is transmitted from another host or ATM switch over a network The ATM cell data is received, the header information included in the ATM cell is decoded to extract necessary information, and only the payload information excluding the header information is transmitted to the host 200.

In addition, the local memory 120 may include packet information about a plurality of cell data received by the cell receiver 110 (for example, data start address, CRC error, congestion, cell priority, information on Abort signal, etc.). 2 is a diagram illustrating the structure of the local memory 120, and includes first, second, third, and third areas 121, 122, ... for storing information on each packet. 123 ...) and processing bit areas S1, S2, S3 ..... for recording whether or not packet information stored in each area is processed.

On the other hand, the host 200 represents a terminal or a PC for processing the transmitted ATM cell, the control unit 210 provided on the host 200 side, if the ATM cell is received by the cell receiving unit 110, the memory unit 220 The usable area of the entire area of the Mn) is allocated to the ATM module 100, and the packet information of the area in which the processing bit is written is detected from the packet information recorded in the local memory 120 of the ATM module 100. The cell data of the corresponding packet among the plurality of cell data stored in the unit 220 is read and output through the predetermined signal processing.

Referring to the diagram of the data processing of the asynchronous transmission mode according to a preferred embodiment of the present invention in detail, when the ATM cell transmitted from the outside is received by the cell receiver 110, the controller 210 is a memory unit ( Among the entire areas of 220, the ATM module 100 allocates a usable area, and the cell receiver 110 stores the received cell data in a memory area allocated through the interface unit 130.

At the same time, the cell receiver 110 records information about each packet received in each area of the local memory 120. During this process, a plurality of cell data for each packet is received and stored. When the last cell data for an arbitrary packet is received, the cell receiver 110 generates an interrupt signal for processing data for the corresponding packet and transmits the interrupt signal to the host 200.

The cell receiver 110 may further include a processing bit for requesting data processing for a corresponding packet in a processing bit area of a region in which information on a packet received in the last cell is stored among regions in which packet information of the local memory 120 is stored ( For example, 1 bit).

For example, a plurality of cell data for each packet (first, second, third packet ...) is received and each cell data is stored in the memory unit 220 of the host 200, each packet 2, the last cell data for the first packet in the cell receiver 110 in a state where packet information about the data is stored in each area 121, 122, 123, ... of the local memory 120 as shown in FIG. When received, the cell receiver 110 transmits an interrupt signal for processing each cell data for a corresponding packet to the host 200 through the interface unit 130.

Then, the processing bit is recorded in the processing bit area S1 of the first area 121 in which the corresponding packet, that is, the packet information of the first packet, of each packet information stored in the local memory 120 is recorded.

On the other hand, when the interrupt signal for the packet is transmitted from the ATM module 100 as described above, the host 200 reads and processes the cell data corresponding to the packet information, that is, the cell data for the first packet. If the operation of the host 200 cannot process each cell data for the first packet because the operation of the host 200 performs different data processing and other commands, the host 200 may later perform an operation in each area of the local memory 120. The recorded processing bit S1 is read to process information about the packet.

That is, when the process of processing other data or the process of performing other commands is finished, the host 200 reads each area (first, second, third, ...) of the local memory 120. The packet information in which the processing bits (S1, S2, S3, ...) are written is read, and the cell data corresponding to the read packet information is read from the memory unit 220 and then processed through a predetermined signal processing process. Done.

3 is a flowchart illustrating a data processing process of an asynchronous transmission mode system according to a preferred embodiment of the present invention. Hereinafter, the series of processes described above with reference to the accompanying drawings will be described in detail.

In the standby state of the asynchronous transmission system including the ATM module 100 and the host 200 configured as shown in FIG. 1 (step 301), each ATM cell data for a plurality of packets from the outside is received by the cell receiver 110. Is received (step 303), the cell receiving unit 110 records information about each packet in each area (step 305), and then receives each ATM cell data received through the interface unit 130 on the host 200 side. In the memory unit 220 (step 307).

While storing the cell data for a plurality of packets by repeating the above-described process, if the last cell data is received in an arbitrary packet (step 309), the cell receiving unit 110 stores each cell data of the local memory 120. The processing bit for processing the cell data of the packet is recorded in the area in which the information on any of the above-described packets of the area is stored (step 311).

Subsequently, the cell receiver 110 transmits an interrupt signal for processing the cell data for the packet to the host 200 through the interface unit 130 (step 313).

If, at this time, the host 200 receiving the interrupt signal and the packet information from the ATM module 100 cannot process the cell data for the corresponding packet to perform another data processing or another command, the ATM module 100 Repeats the above-described steps to continue storing the cell data for each packet received from the outside again.

On the contrary, the host 200 reads the processing bits for each area of the local memory 120 at the time when the interrupt signal and the packet information are transmitted from the ATM module 100 or at any time after the transmission, and then processes them. When a plurality of cell data stored in the memory unit 220 is processed based on packet information of a region in which a bit is recorded (step 315), the cell receiver 110 performs processing of the processed region of each region of the local memory 120. The packet information is deleted so that other packet information received thereafter can be recorded (step 317).

In addition, the control unit 210 of the host 200 also writes a discard bit in the area where the cell data processed in the above-described step 315 is stored among the areas of the memory unit 220 in which the cell data for the plurality of packets is stored. In this case, other cell data can be stored in the corresponding memory area (step 319).

As a result, the ATM module 100 stores the packet information on the ATM cell data received from the outside in the local memory 120, and when the last cell data for any packet is received, the local information on the packet is stored. By writing a separate processing bit in the memory 120, it is possible to adaptively process each cell data for the packet in accordance with the operating state of the host 200.

As described above, according to the present invention, it is possible to adaptively process each cell data according to the operating state of the host processing the actual asynchronous transmission mode cell data in the asynchronous transmission mode system, thereby preventing overloading of the host. There is an effective effect, and thus there is an effect that can prevent the loss of data.

Claims (2)

Asynchronously including an ATM module that receives cell data for a plurality of packets received from the outside, separates and writes information on each packet, and stores the received cell data in a predetermined area of a memory unit and processes the same. In the data processing method of the transmission mode system, A first step of recording packet information for each packet when a plurality of cell data for a plurality of packets is received in the ATM module; A second step of allocating a memory area for storing the plurality of cell data to store the received cell data; During the storing of the plurality of received cell data, when the last cell data for any one of the packets is received, a processing bit for processing the packet information is stored in an area where the packet information for the arbitrary packet is stored. A third step of recording; A fourth step of transmitting an interrupt signal for processing a plurality of cell data for the arbitrary packet to the host and repeating the process after the first step; A fifth step of deleting packet information and processing bits for the arbitrary packets when packet information for the arbitrary packets is read and a plurality of cell data for the arbitrary packets have been processed. How data is processed. The method of claim 1, In the fifth step, when a plurality of cell data for the arbitrary packet is processed, a cell discard bit is written in an area in which the plurality of cell data for the arbitrary packet is stored, and the cell data for the other received packet is recorded. The data processing method of the asynchronous transmission mode system further comprising the step of storing.

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