KR100332960B1 - Working Device for mapping a Circuit Network Data and Asynchronous Transfer Mode Network Data in a ATM Network and The Method Thereof - Google Patents

Abstract

The present invention relates to an interworking device and an interworking method for mapping between network information and asynchronous transfer mode network information in an asynchronous transfer mode (ATM) network, and includes a vertical frame buffer for storing data flowing into or out of the network. A data format converter is configured between the Vertical Frame Buffer (VFB) and the Horizontal Cell Buffer (HCB) that stores data flowing into or out of the ATM network, and is interrupted by an interrupt generated during frame reception / transmission at the network connection. Insertion of CAS information by controlling the data format conversion unit by an operating control unit to convert between network data and ATM network data, and differentiate the operation of the control unit depending on the presence or absence of CAS (Channel Associate Signaling) information during data format conversion. And extraction operation can be easily performed, and then By in predicting the type of emulation circuit structure to a character asynchronous transfer to improve the data rate conversion mode network interworking method is presented for the mappings between the network information, and Asynchronous Transfer Mode network information.

Description

Working device for mapping a circuit network data and asynchronous transfer mode network data in a atm network and the method thereof}

The present invention provides an interworking device and an interworking method for supporting a structured data format service among circuit emulation services in an asynchronous transfer mode network (hereinafter, referred to as an 'ATM') network. In more detail, the present invention relates to an interworking device and an interworking method for mapping between network information and asynchronous transmission mode network information in an asynchronous transmission mode network.

In general, when data is to be transmitted and received between a network and an ATM network, the format of the data must be converted according to a standard used in each communication network. ATM-FORUM Recommendation AF-VTOA-0078.000 Circuit Emulation Service Interoperability Version 2.0 introduces the interworking between the ATM and the network for supporting N × 64 Kbps structured data format service among the circuit emulation services in ATM networks. System architecture and algorithms are shown. Conventionally, such a data format conversion has been processed in hardware, and thus there is a problem such as an increase in cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and by using a control unit implemented in software in performing a mapping function between network information and ATM network information, it is easy to implement a system and related operating elements. The technical problem is to provide a circuit emulation service having excellent performance.

In accordance with an aspect of the present invention, there is provided an interlocking device for mapping between network information and asynchronous transmission mode network information in an asynchronous transmission mode network. A vertical frame buffer unit configured for each port of the network connection unit to store network data; A horizontal cell buffer unit for storing an asynchronous transmission mode adaptive layer type-1 protocol data unit AAL1 PDU in the form of an asynchronous transmission mode (ATM) network data; An AAL1 PDU header processing unit for inserting an AAL1 header into the AAL1 PDU stored in the horizontal cell buffer unit or reading an AAL1 PDU into the vertical frame buffer; An ATM cell processor for receiving an AAL1 PDU from the AAL1 PDU header processor and inserting an ATM cell header and transmitting the ATM cell header to an ATM network or receiving an ATM cell from an ATM network, extracting an AAL1 PDU, and delivering the AAL1 PDU to the AAL1 PDU header processor; A data format converter for converting network data recorded in the vertical frame buffer and transmitting the converted data to the horizontal cell buffer or converting AAL1 PDU information recorded in the horizontal cell buffer to the vertical frame buffer; A reference information table section for providing the control unit with schedule information about data to be transmitted and information about a logical connection to which a time slot is allocated; And a control unit for controlling the operation of the data format conversion unit by using the reference information table unit.

In addition, the interlocking method for mapping between the network information and the asynchronous transmission mode network information in the asynchronous transmission mode network according to the present invention for achieving the above technical problem interrupts generated in the control unit in the network connection unit as the network data is received or transmitted Checking a schedule bit for each time slot by a; Obtaining an identifier of a logical connection to which a corresponding time slot is allocated when a schedule bit of a specific time slot is set as a result of checking the schedule bit; Identifying a location of a descriptor table using the identifier and inspecting an environment field of the descriptor table; Performing a parameter value programming process for a basic mode, setting a conversion initial bit, and performing a data format conversion in the basic mode when the environment field is checked; Storing the address after the conversion of the vertical frame buffer (VFB) and the horizontal cell buffer (HCB) on the receiving side or the transmitting side in the descriptor table after performing the conversion; After checking the environment field, in the case of the Weed-cas mode, the length of the data to be newly written in the receiving side or the transmitting side HCB and the number of bytes required until the end of the structure are obtained, and then the AAL1 PDU is assigned to the receiving side or the transmitting side HCB. If the number of bytes to configure is smaller than the number of bytes necessary to construct a structure, proceeding to the parameter value programming process for the basic mode; And if the number of bytes for constructing the AAL1 PDU in the receiving side or the transmitting side HCB is larger than the number of bytes necessary for constructing the structure, perform the parameter value programming process for the Weed Cass mode, set the CAS initial bit, and then set the data format. Characterized in that it comprises the step of proceeding to the conversion process.

1 is a block diagram of a companion device for mapping between network information and asynchronous transmission mode network information in an asynchronous transmission mode network according to the present invention.

2A and 2B are structural diagrams of a vertical frame buffer and a signaling buffer applied to the present invention.

3 is a structural diagram of a horizontal frame buffer applied to the present invention.

4A and 4B are flowcharts illustrating an interworking method between circuit information and asynchronous transmission mode network information in an asynchronous transmission mode network according to the present invention;

5 is a structural diagram of a schedule table applied to the present invention.

<Description of the symbols for the main parts of the drawings>

11 network connection part 12 vertical frame buffer part

12-1: Receive side vertical frame buffer 12-2: Sender vertical frame buffer

13 data format converter 14 control unit

15: horizontal cell buffer 15-1: receiving side horizontal cell buffer

15-2: Horizontal cell buffer of the transmitting side 16: AAL1 PDU header processing unit

17: ATM cell processing unit 18: reference information table

18-1: Schedule Table 18-2: Descriptor Table

The interworking device for mapping between the network and ATM network information presented in the present invention converts data flowing from the network into a state capable of being transmitted from the ATM network, and conversely, converts information from the ATM network into a form that can be transmitted from the network. Do this. The rules for the type and transformation of data transmitted between the network and the ATM network here follow the specifications set out in ITU-T Rec. I.363.1 and ATM-FORUM Recommendation AF-VTOA-0078.000.

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

1 is a block diagram of a companion device for mapping between network information and asynchronous transmission mode network information in an asynchronous transmission mode network according to the present invention.

As shown, the interworking device for mapping between the network information and the asynchronous transmission mode network information according to the present invention includes a network connection unit 11, a vertical frame buffer (hereinafter referred to as 'VFB') unit 12 A data format conversion unit 13, a control unit 14, a horizontal cell buffer (hereinafter referred to as "HCB") unit 15, an ATM adaptation layer type-1; A protocol data unit (hereinafter referred to as a 'PDU') header processing unit 16, an ATM cell processing unit 17, and a reference information table unit 18 are included. More detailed description is as follows.

First, the data flow from the network to the ATM network will be described. The T1 / E1 type network data introduced through the network connection unit 11 is stored in the receiving side VFB (RVFB; 12-1) of the VFB unit 12. This data is converted by the data format conversion unit 13 under the control of the control unit 14 and stored in the receiving side HCB (RHCB) 15-1 of the HCB unit 15. The data stored in the RHCB 15-1 is in the form of AAL1 PDUs and has the form defined in ITU-T Rec. I.363.1. This type of data is again transferred to the AAL1 PDU header processing unit 16 under the control of the control unit 14 to perform CRC-3 and parity check of the AAL1 header, and then transmitted to the ATM cell processing unit 17. The ATM cell processing unit 17 inserts a 5-octet header into the AAL1 PDU and transmits it to the ATM network.

Meanwhile, referring to the data flow from the ATM network to the network, the ATM cell processing unit 17 extracts the AAL1 PDU from the ATM cell introduced from the ATM network and transmits the AAL1 PDU to the AAL1 PDU header processing unit 16, and the AAL1 header processing unit 16 ) Performs CRC-3 and parity check on the AAL1 PDU header. Thereafter, the inspected AAL1 PDU is stored in the transmission side HCB (THCB) 15-2 of the HCB unit 15, and under the control of the control unit 14, the data format conversion unit 13 performs the THCB 15-2. The stored information is converted into the VFB (TVFB) 12-2. The information stored in the TVFB 12-2 is transmitted to the network at a constant speed by the network connection unit 11.

Each part of the companion device for mapping between the network and ATM network information shown in FIG. 1 will be described in more detail with reference to FIGS. 2 and 3.

The network connection unit 11 performs a function of storing the T1 / E1 frame information flowing from the network in the RVFB and, on the contrary, transmits the information stored in the TVFB to the network at regular intervals. The interface that the network connection 11 has to the network is not proposed in the present invention, and other general equipment for processing the T1 / E1 frame has an interface presented by the device. Through this interface, data and signaling related data of the network are exchanged.

The vertical frame buffer unit 12 is composed of an RVFB 12-1 and a TVFB 12-2, the structure of which is shown in FIG. 2A and 2B are structural diagrams of a vertical frame buffer and a signaling buffer applied to the present invention.

When multiple ports exist in the network connection unit 11, the VFB is configured for each port and used to store T1 / E1 frame information flowing from each port. As can be seen in FIG. 2A, the VFB logically consists of 32 octets of columns and 64 bytes of rows. Each octet in the VFB contains information from the T1 / E1 network, or information from the ATM network and converted to T1 / E1 format, where each time slot number in the T1 / E1 frame is a column in the VFB. Data is recorded or read out by the network connection unit 11 at every 125 kHz into which the E1 frame flows. Therefore, in the case of E1, all octets from column 0 to column 31 are filled with values from time slots 0 to 31 of the E1 frame introduced every 125 ms, and all line areas are used for frame reception. For T1, octets in columns 0 through 23 and octets in columns 32 through 55 are filled with values from T1 frame time slots 0 through 23, 32 through 55, and from lines 24 through 31 and lines 56 through. Lines up to 63 are not used to store data.

In addition, four bits of signaling data are transmitted and received for each time slot every 24 frames in the case of T1 and every 16 frames in the case of E1. A total of 64 octets of signaling buffers are used to store them. 2B shows the structure of the signaling buffer. In the case of a T1 frame, 12 octets of signaling data are transmitted and received to the signaling buffer every 24 frames. In the case of an E1 frame, 16 octets of signaling data are transmitted and received every 16 frames. Accordingly, in the case of T1, a total of two multiframes and signaling data related thereto may be stored in the VFB, and in the case of E1, a total of four multiframes and signaling data related thereto may be stored.

The data format conversion unit 13 performs an operation of converting and transferring data stored in the VFB and the HCB under the control of the control unit 14. That is, the data is converted from the frame information recorded in the VFB to the 64Kbps time slot unit and transferred to the HCB, and the AAL1 PDU information of the HCB is read and converted to 64Kbps unit data and then transferred to the VFB. T1 / E1 frames and AAL1 PDUs, which are types of information stored in the VFB and HCB, follow the definitions defined in ITU-T G.704 and I.363.1, respectively. The data format conversion unit 13 is controlled by the control unit 14 through the register interface. The parameter used and the operation of the data format conversion unit by this parameter can be described as follows in each direction.

First, the operation of the data format converter for data flowing from the network to the ATM network is as follows. In this case, the data format conversion unit reads data stored in the VFB and configures the AAL1 PDU, and stores the data in the HCB. In order to perform such an operation, the control unit controls the data format converter using the following parameters.

1. Allocated time slot: The data format converter displays the information on the column where the information to be converted is located by assigning bits to each column, and has a total size of 32 bits. It shows the heat to become.

2. Channel Associate Signaling (hereinafter, referred to as 'CAS') insertion: Signaling data for all allocated time slots after data format conversion is recorded in HCB.

3. Conversion Length: The length of the data to convert in octets.

4. RVFB conversion start address: This is the address where the data to start conversion in RVFB is located.

5. RHCB conversion start address: This is an address where data to be converted is recorded in the RHCB.

6. Initialize the transformation: Start the transformation.

By the parameters defined above, the data format conversion unit 13 reads data of the specified length only in the allocated time slots while increasing the address in the RVFB, and writes the data to the RHCB 15-1, and enables the CAS insertion signal to be enabled. If so, the signaling data for the allocated time slot is read from the signaling buffer and the data is written to the RHCB 15-1 in the next area.

Next, when data flows from the ATM network to the network direction, the operation of the data format converter 13 is as follows. In this case, the data format conversion unit 13 reads AAL1 PDU data flowing from the ATM network and stored in the THCB 15-2, extracts data for each time slot, and records the data in the corresponding time slot of the TVFB 12-2. Perform the action. In order to perform such an operation, the control unit 14 controls the data format conversion unit 13 using the following parameters.

1. Allocated time slot: The data format converter displays the information on the column where the information to be converted is located by assigning bits to each column. It has a total size of 32 bits and is set to 1 to be converted. Indicates heat.

2. CAS Extraction: After signaling data format, the signaling data for all allocated time slots is recorded in the signaling buffer.

3. Conversion Length: The length of the data to convert in octets.

4. TVFB conversion start address: This is an address where data to be converted to TVFB is recorded.

5. RHCB conversion start address: This is the address where data to start conversion in THCB is located.

6. Initialize the transformation: Start the transformation.

The data format conversion unit operates as follows by the parameters defined above. In the THCB, the data is read in order by the specified length while increasing the address, and the data is written in order in the TVFB's assigned time slot position. When the CAS extraction signal is enabled, the signaling data is read from the HCB data after reading the HCB data, and the signaling data of the allocated time slot is recorded in the signaling buffer.

The control unit 14 receives the signals from the network connection unit 11 and the AAL1 PDU header processing unit 16 and controls the operation of the data format conversion unit 13 for each logical connection by referring to the reference information table 18. This function controls the data conversion between network data and AAL1 PDU.

The HCB unit 15 is composed of an RHCB 15-1 and a THCB 15-2, and is used to store 48 octets of AAL1 PDUs. 3 is a structural diagram of a horizontal frame buffer according to the present invention. The HCB unit 15 extracts data for each time slot from data stored in the VFB unit 12 in the form of a T1 / E1 frame, and then configures the cell data of the AAL1 PDU type or the AAL1 PDU type extracted from the ATM cell received from the ATM network. Used to store cell data. In the HCB, data in the form of AAL1 PDU is recorded in a continuous data area. In addition, the HCB has 16 octets of spare locations for continuous recording of signaling data. Therefore, a total of 64 octets of space are allocated for each logical connection from logical connection 0 to logical connection N. 3 shows the type of HCB allocated to a logical connection, and this logical connection can be allocated up to 24 for T1 and 32 for E1.

The AAL1 PDU header processing unit 16 reads the payload of the AAL1 PDU stored in the HCB unit 15, inserts a 1-byte AAL1 header and transmits it to the ATM cell processing unit, and reads the AAL1 PDU from the ATM cell processing unit 17. After determining the suitability of the AAL1 PDU header, and stores in the VFB (12). The construction and inspection of the AAL1 PDU header is in accordance with ITU-TI.363.1.

The ATM cell processing unit 17 receives 48 octets of the AAL1 PDU from the AAL1 PDU header processing unit 16, inserts an 5-octet ATM cell header corresponding to the logical connection, and transmits 53 bytes of ATM cell information to the ATM network. It receives the 53-octet ATM cell from the ATM network, checks the suitability of the ATM cell header, extracts the AAL1 PDU, and delivers it to the AAL1 PDU header processing unit.

4A and 4B are flowcharts illustrating a method of interworking between network information and asynchronous transmission mode network information in an asynchronous transmission mode network according to the present invention. Referring to FIG. 5, a process of converting network data into an AAL1 PDU and The two data flows of converting the AAL1 PDU into the network data will be described.

Referring to FIG. 4A, a segmentation process of transforming network data into an AAL1 PDU will be described.

When the T1 / E1 frame is received from the network (S401), the network connection unit generates an interrupt to the control unit 14 to inform that the frame has been received (S402). The control unit 14 checks the schedule bits for each time slot from the schedule table 18-1 by using the line at the position where the frame mapped to the interrupt is written in the VFB as an index when the interrupt is received (S403).

5 is a structural diagram of a schedule table 18-1 applied to the present invention, and each line corresponds to an index of an interrupt. The control unit 14 checks the schedule status for all time slots each time an interrupt occurs. For the scheduled time slots, the partition state of the logical connection is determined by referring to the descriptor table 18-2 of the logical connection to which the corresponding time slot is allocated. By controlling the operation, the AAL1 PDU can be configured in the HCB unit 15. Such a schedule table sets a schedule bit in the position of the time slot having the smallest value among the time slots allocated to the logical connection so that a single processing is performed when an interrupt occurs for the logical connection. In addition, for the performance of a system or device using such a method, a method of predicting the next schedule position and reflecting it in a schedule table is used.

Once the schedule bit of a particular time slot is set, an identifier of a logical connection to which the corresponding time slot is allocated is obtained (S404), and the position of the descriptor table is determined using this value (S405). In the descriptor table, there is a configuration field for the attribute of the logical connection, in which selection fields for basic mode and withCAS mode are defined. By checking the attribute of the logical connection defined in this field (S406), the control unit 14 operates as follows.

In the basic mode, that is, when only data is transmitted, program [start address of allocated RHCB area + 1] to the RHCB conversion start address, and RVFB address where the data is first located from the area after the previous conversion. The AAL1 PDU payload length for each connection, which is set for each logical connection and stored in the descriptor table, is input as the conversion length, and the time slot information allocated for each logical connection is programmed (S407). When the conversion initial bit is set (S408) and the conversion is performed (S409) after such programming, data in the form of AAL1 PDU is configured in the HCB. After the conversion, the address after the conversion of the VFB and the HCB is read out and stored in the descriptor table (S410).

In the case of the Widows mode, that is, when signaling data is transmitted together with data, CAS information should be inserted in units of multiframes according to the circuit emulation structure defined in ATM-FORUM AF-VTOA-OO78.000. Works together. First, the length of the AAL1 PDU payload allocated to each connection is read from the descriptor table, and the length of previously configured CAS information is also read from the descriptor table, and the length of data to be newly written in the RHCB is checked using the difference. do. In addition, information on the relative position of the circuit emulation structure during conversion recorded in the previous conversion is also read from the descriptor table to obtain the number of bytes necessary until the end of the structure (S411). Comparing the two values thus obtained (S412), if the number of bytes for configuring the AAL1 PDU in the RHCB is smaller than the number of bytes necessary for constructing the structure, that is, if there is no CAS information in the RHCB, the Basic mode After programming the transformation, perform the transformation to construct the AAL1 PDU. On the other hand, if the number of bytes for constructing the AAL1 PDU in the RHCB is larger than the number of bytes necessary for constructing the structure, that is, if CAS information exists in the RHCB, [start address of the allocated RHCB region + 1] is set to RHCB. Program the translation start address, program the address of the RVFB where the data is initially located from the area after the previous conversion, to the RVFB translation start address, specify the conversion length as the number of bytes required to the end of the structure, and assign it also by logical concatenation. Programmed time slot information (S413). Thereafter, the CAS insertion bit is set (S414) to perform the conversion (S409).

Next, a process of converting the AAL1 PDU into network data will be described with reference to FIG. 4B.

When the T1 / E1 frame is transmitted from the network (S501), the network connection unit generates an interrupt to the control gear unit at every time interval for transmitting the frame (S502). When the control unit receives the interrupt, the control unit checks the schedule bit for each time slot from the scheduling table by using the line at the position where the frame mapped to the interrupt is written on the VFB as an index (S503). Once the schedule bit of a specific time slot is set, an identifier of a logical connection to which the corresponding time slot is allocated is obtained (S504), and the position of the descriptor table is determined using this value (S505). In the descriptor table, there is a configuration field for an attribute of a logical connection, and a selector field is defined for basic mode and withCAS mode. By checking the property of the logical connection defined in this field (S506), the control unit operates as follows.

In the basic mode, i.e. when only transmitting data, program [start address of assigned THCB area + 1] to THCB conversion start address, and set the TVFB address where data is first located from the area after the previous conversion. The AAL1 PDU payload length for each connection, which is set for each logical connection and stored in the descriptor table, is input as the conversion length, and the time slot information allocated for each logical connection is programmed (S507). After such programming, the conversion initial bit is set (S508) and the conversion is performed (S509). The information in the payload of the AAL1 PDU stored in the THCB is converted into a T1 / E1 frame and stored in the TVFB. After the conversion, the addresses after the conversion of the TVFB and THCB are read and stored in the descriptor table (S510).

In the case of the Widows mode, that is, when transmitting signaling data together with data, CAS information must be extracted for each multiframe unit according to the circuit emulation structure defined in ATM-FORUM AF-VTOA-0078.000. do. First, the length of the AAL1 PDU payload allocated for each connection is read from the descriptor table, and the length of previously configured CAS information is also read from the descriptor table, and the length of data to be newly written in the THCB is checked using the difference. . Further, information on the relative position of the circuit emulation structure at the time of conversion recorded at the time of the previous conversion is also read from the descriptor table to obtain the number of bytes necessary until the end of the structure (S511). Comparing the two values thus obtained (S512), if the number of bytes for configuring the AAL1 PDU in the THCB is smaller than the number of bytes necessary for constructing the structure, that is, if there is no CAS information in the THCB, the basic As in the case of the mode, the data format converter is programmed and then converted to configure an AAL1 PDU. On the other hand, if the number of bytes for constructing the AAL1 PDU in the THCB is larger than the number of bytes necessary for constructing the structure, that is, if CAS information exists in the THCB, [Start address of the allocated THCB area + 1] Program the THCB conversion start address, program the address of the TVFB where data is initially located from the region after the previous conversion to the TVFB conversion start address, specify the conversion length as the number of bytes required to the end of the structure, and also for logical connections The allocated time slot information is programmed (S513). Thereafter, the CAS insertion bit is set (S514) and the process proceeds to step (S509) for performing the conversion.

As such, by differentiating the operation of the control unit according to the presence or absence of CAS information, the insertion / extraction operation of CAS information for recording signaling data for all allocated time slots after the data conversion to the HCB or signaling buffer can be easily performed. have.

As described above, the present invention enables data processing for each time slot of a frame by storing data flowing into or out of the network in the VFB. In addition, a data format conversion unit is configured between the VFB and the HCB, and the information is converted between the T1 / E1 frame in the VFB and the AAL1 PDU in the HCB by controlling by a control unit operating by an interrupt generated when receiving or transmitting a frame at the network connection unit. In addition, the operation of inserting and extracting CAS information can be easily performed by differentiating the operation of the control unit according to the presence or absence of CAS information during information conversion. In addition, data conversion speed can be improved by predicting the shape of the circuit emulation structure to be assembled / split next time.

Claims (10)

Network connections; A vertical frame buffer unit configured for each port of the network connection unit to store network data; A horizontal cell buffer unit for storing an asynchronous transmission mode adaptive layer type-1 protocol data unit AAL1 PDU in the form of an asynchronous transmission mode (ATM) network data; An AAL1 PDU header processing unit for inserting an AAL1 header into the AAL1 PDU stored in the horizontal cell buffer unit or reading an AAL1 PDU into the vertical frame buffer; An ATM cell processor for receiving an AAL1 PDU from the AAL1 PDU header processor and inserting an ATM cell header and transmitting the ATM cell header to an ATM network or receiving an ATM cell from an ATM network, extracting an AAL1 PDU, and delivering the AAL1 PDU to the AAL1 PDU header processor; A data format converter for converting network data recorded in the vertical frame buffer and transmitting the converted data to the horizontal cell buffer or converting AAL1 PDU information recorded in the horizontal cell buffer to the vertical frame buffer; A reference information table section for providing the control unit with schedule information about data to be transmitted and information about a logical connection to which a time slot is allocated; And And a control unit for controlling the operation of the data format conversion unit by using the reference information table. 2. The companion device for mapping between network information and asynchronous transmission mode network information in an asynchronous transmission mode network. The method of claim 1, The vertical frame buffer has a logical structure consisting of 32 octets of columns and 64 bytes of rows. 2. The interworking apparatus for mapping between network information and asynchronous transmission mode network information in an asynchronous transmission mode network. The method of claim 1, The horizontal cell buffer comprises 48 octets of data storage for storing the AAL1 PDU for each logical connection and 16 octets of spare for continuous recording of signaling data. Interworking apparatus for mapping between network information and asynchronous transmission mode network information in. Checking the schedule bits for each time slot by an interrupt generated by the network connection to the control unit as the network data is received or transmitted; Obtaining an identifier of a logical connection to which a corresponding time slot is allocated when a schedule bit of a specific time slot is set as a result of checking the schedule bit; Identifying a location of a descriptor table using the identifier and inspecting an environment field of the descriptor table; Performing a parameter value programming process for a basic mode, setting a conversion initial bit, and performing a data format conversion in the basic mode when the environment field is checked; Storing the address after the conversion of the vertical frame buffer (VFB) and the horizontal cell buffer (HCB) on the receiving side or the transmitting side in the descriptor table after performing the conversion; After checking the environment field, in the case of the Weed-cas mode, the length of the data to be newly written in the receiving side or the transmitting side HCB and the number of bytes required until the end of the structure are obtained, and then the AAL1 PDU is assigned to the receiving side or the transmitting side HCB. If the number of bytes to configure is smaller than the number of bytes necessary to construct a structure, proceeding to the parameter value programming process for the basic mode; And When the number of bytes for constructing the AAL1 PDU in the receiving side or the transmitting side HCB is larger than the number of bytes necessary for constructing the structure, the parameter value programming process for the Weed-Cas mode is set, and the data format is converted after setting the cas initial bit The interworking method for mapping between the network information and the asynchronous transmission mode network information in the asynchronous transmission mode network, characterized in that it comprises a step of proceeding to a process. The method of claim 4, wherein The process of checking the schedule bit by the control unit is performed by using a line at a position where the network data mapped to the corresponding interrupt is written in the vertical frame buffer on the receiving side as an index. Interworking method for mapping between transmission mode network information. The method of claim 4, wherein The parameter value programming process for the basic mode may include: programming [the start address of the allocated receiving side horizontal cell buffer (HCB) + 1] to the HCB translation start address; Programming the address of the VFB where the data is initially located from the area after the previous conversion to the VFB conversion start address; Inputting the connection-specific AAL1 PDU payload length set for each logical connection and stored in the descriptor table as a conversion length; And A method for interworking for mapping between network information and asynchronous transmission mode network information in an asynchronous transmission mode network, comprising: programming time slot information allocated for each logical connection. The method of claim 4, wherein The parameter value programming process for the Weed-cas mode includes the steps of: programming [start address of assigned HCB region + 1] to HCB conversion start address; Programming the address of the VFB where the data is initially located from the area after the previous conversion to the VFB conversion start address; Specifying a conversion length as the number of bytes needed to the end of the structure; And A method of interworking for mipping between network information and asynchronous transmission mode network information in an asynchronous transmission mode network, comprising: programming time slot information allocated for each logical connection. The method of claim 4, wherein The process of converting network data into an AAL1 PDU during the data format conversion process includes reading data of a specified length only in an allocated time slot while increasing an address in the receiving side VFB and writing the data in the receiving side HCB; And In the asynchronous transmission mode network, if the casing insertion signal is enabled, reading the signaling data for the allocated time slot from the signaling buffer and writing the data to the next area where the data is written in the receiving HCB. Interworking method for mapping between network information and asynchronous transmission mode network information. The method of claim 4, wherein The network data conversion of AAL1 PDU data during the data format conversion may include reading data sequentially by a predetermined length while increasing an address in a transmitting HCB, and sequentially recording the data in an allocated time slot position of a transmission layer VFB; And And a case in which the casing extraction signal is enabled, reading the signaling data from the next region in which the HCB data is read and writing the signaling data of the allocated time slot to the signaling buffer. Interworking method for mapping between network information and asynchronous transmission mode network information in a network. The method according to any one of claims 8 and 9, In the data format conversion process, information about a column in which data to be converted is located by assigning bits to each column is displayed and has a total size of 32 bits, and the case where it is set to 1 indicates a column to be converted. Assigned time slot parameters for; A channel combined signal insertion parameter for recording signaling data for all allocated time slots in the HCB after the data format conversion; A conversion length parameter for representing the length of the data to be converted in octets; A VFB conversion start address parameter for indicating a VFB address of data to start conversion; An HCB conversion start address parameter for indicating an HCB address for recording the converted data; And An interworking method for mapping between network information and asynchronous transmission mode network information in an asynchronous transmission mode network, characterized in that the conversion is performed using a conversion initialization parameter to indicate that the conversion is started.