KR20020012979A - Apparatus and method for atm trunk interfacing in atm switching system - Google Patents

Abstract

PURPOSE: An apparatus and a method for ATM(Asynchronous Transfer Mode) trunk interface in an ATM exchange system are provided, which process different kinds of ATM cells separately according to a type of AAL(ATM Adaptation Layer). CONSTITUTION: The ATM trunk interface apparatus comprises a cell distribution switch part(130), AAL processing parts(140-170) and a control part(180). The cell distribution switch part separates AAL types as to ATM cells from an ATM physical layer processing part(110) or as to bidirectional ATM cells passing through an ATM trunk interface and switches them to their corresponding destination. The AAL processing parts perform a corresponding AAL function as to the ATM cell of an AAL type corresponding to itself. The AAL function includes an ATM cell header analysis and conversion operation. The control part performs a control and management function as to the whole function of the ATM trunk interface apparatus, and performs an IP communication with other processors.

Description

A-T-M trunk interface device and method in A-T-M exchange system {APPARATUS AND METHOD FOR ATM TRUNK INTERFACING IN ATM SWITCHING SYSTEM}

The present invention relates to an A-T-M exchange system, and more particularly, to an A-T-M trunk interface device and method.

In addition, in the present invention, an ATM trunk interface (ATM Trunk) that performs interfacing at an ATM switch input terminal, such as an ATM Adaptation Layer (AAL) function, in an Asynchoronous Transfer Mode (ATM) exchange system. Interface) Apparatus and method, the present invention is applicable to all networks based on ATM, such as IMT-2000 network as well as pure ATM network.

The ATM trunk interface performs the functions of the Physical Layer, ATM Layer, and ATM Adaptation Layer (hereinafter referred to as AAL), so that the ATM switch is required for ATM cell switching. It will perform its own function. In addition, the types of user traffic that can be carried in an ATM cell are varied, such as voice, data, image information, and the like, and these various user traffics are transmitted through AALs suitable for each traffic type.

Meanwhile, AAL1, which is defined by standardization, is suitable for real-time constant bit rate signal transmission such as voice, and AAL2 is the constant bit rate signal transmission and short data. Suitable for transmission to (Short Data). In addition, AAL 3/4 and AAL 5 are suitable for data transfer, which is suitable for non real-time traffic such as file transfer or Internet search. At this time, the AAL 5 is used for a simple transmission technique.

Accordingly, an ATM trunk interface capable of simultaneously processing the plurality of AAL type ATM cells is required in an ATM-based network that needs to transmit traffic having different attributes such as voice and data, such as the IMT-2000 network.

On the other hand, when a plurality of different types of cell streams are input through a single ATM trunk interface, the ATM trunk interface needs very large processing power to simultaneously process cells of different AAL types. However, currently available ATM devices lack the processing capacity of the ATM trunk interface, which is expected to reduce the quality of service.

Therefore, if two-way ATM cells input to the ATM trunk interface are separated by AAL type, and at this time, the interface with the corresponding device by the separated AAL type is defined, the two-way ATM cells are distributed by different devices in the ATM trunk interface device. Can be Therefore, an ATM trunk interface capable of high speed and efficient interface processing may be designed.

In addition, differentiation of services may be possible by varying priorities according to requirements for quality of service such as Cell Transfer Delay or Cell Loss.

Accordingly, an object of the present invention is to provide an ATM trunk interface device and method for distributing different types of ATM cells input by an ATM switching system according to AAL types.

Another object of the present invention is to provide an ATM trunk interface apparatus and method for separating different types of ATM cells input from an ATM switching system according to types of AALs, and an AAL processing unit for each type performs distributed AAL processing of input ATM cells. have.

Another object of the present invention is to separate different types of ATM cells inputted from an ATM switching system for each AAL type, to define the interface of the separated AAL processing unit for each AAL type, and the corresponding AAL processing unit for each type of input ATM. An apparatus and method for processing distributed AAL cells are provided.

Another object of the present invention is to switch an ATM cell input from an ATM switching system to a corresponding destination, perform a corresponding IPC processing operation on an IPC processing cell, and a plurality of AAL processing devices are distributed among AAL types for an input ATM cell. The present invention provides an ATM trunk interface device for defining an interface for each device and outputting the processed corresponding ATM cell to a corresponding destination.

Another object of the present invention is to identify an AAL type of an ATM cell input from an ATM switching system, and if the input ATM cell corresponds to IPC processing, perform the corresponding IPC processing, and an AAL type provided with the AAL type of the input ATM cell. In this case, the AAL processing is performed by distributing by AAL type and outputting the processed ATM cell to a corresponding destination.

According to an aspect of the present invention, an A-T-M trunk interface device of an A-T-M switching system includes: a cell distribution switch unit configured to switch an input A-T-M cell to a corresponding destination; The I-PC-processing cell of the A-T-M cell is processed to transfer the corresponding I-PC-C back to the cell distribution switch unit, and performs the control and maintenance operation of the A-T-M trunk interface device. And a plurality of A-A-L processes for performing the corresponding A-A-L processing on the A-A-L type cell corresponding to the cell among the input A-T-M cells and transferring the same to the cell distribution switch unit. It is characterized by consisting of the A-A-L processing units for each type.

In addition, the present invention provides an A-T-M trunk interface device of the A-T-M exchange system, the cell distribution switch unit for switching the input A-T-M cell to a corresponding destination, and the input A-T-M cell A control unit configured to transfer an i-PC-processing cell from the i-PC-process to the cell distribution switch unit, and to perform a control and maintenance operation of the A-T-m trunk interface device; A-A-L-type by performing a corresponding A-A-L processing on the A-A-L type cell corresponding to itself among the T-M cells and transferring the same to the cell distribution switch unit. L processing units and the plurality of physical signal matching units which perform transmission / reception signal matching at a physical level between the cell distribution switch unit and each of the A-A processing units. It shall be.

The present invention relates to a first process of identifying an A-A-L type of an A-T-M cell to which an A-T-M trunk interface method of an A-T-M exchange system is input, and the input A-T. If the M-cell corresponds to the I-PC-process, the second process of performing the corresponding I-PC-process, and the A-A-A-A-E-type provided with the A-A-L type of the input A-T-M cell; If it corresponds to the L type processing, the third process of performing A-A-L processing by distributing by A-A-L type, and the corresponding A-T-M cell processed in the second process and the third process, respectively And a fourth process of outputting to the destination.

1 is a block diagram of an ATM trunk interface device according to an embodiment of the present invention in an ATM switching system.

2 is a block diagram of an ATM trunk interface device according to another embodiment of the present invention in an ATM switching system.

3 is a flowchart illustrating an ATM trunk interface method according to an embodiment of the present invention in an ATM switching system.

4 is a flowchart illustrating an ATM trunk interface method according to another embodiment of the present invention in an ATM switching system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Specific details appear in the following description, which is provided to aid a more general understanding of the present invention, and it should be understood by those skilled in the art that the present invention may be practiced without these specific details. It will be self explanatory. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram of an ATM trunk interface device according to an embodiment of the present invention in an ATM switching system.

As shown in FIG. 1, an ATM trunk interface device according to an exemplary embodiment of the present invention includes a cell distribution switch unit 130, a first AAL processing unit 140 to an Nth AAL processing unit 170, and a controller 180. It is made of.

The following description is based on the transmission direction of the ATM cell from the counterpart system or the ATM physical layer processing unit 110 to the ATM trunk interface device, but the ATM trunk interface device operates according to the corresponding method and procedure for the opposite direction. Do this.

The cell distribution switch unit 130 separates the AAL type for the ATM cells from the ATM physical layer processing unit 110 or the bidirectional ATM cells passing through the ATM trunk interface and switches to the corresponding destination. In this case, the destination includes the controller 180, the first AAL processing unit 140 to the Nth AAL processing unit 170, the ATM physical layer processing unit 110, the loop-back path and the bypass path. do. In this case, the ATM cell to be bypassed may be pure user data without processing by the ATM trunk interface device via the bypass path. The cell distribution switch unit 130 transmits the ATM cell to the controller 180 when the corresponding ATM cell corresponds to an IPC (Inter Process Communication) cell.

In addition, the cell distribution switch unit 130 indexes a virtual path identifier (VPI) and a virtual channel identifier (VCI) of an ATM cell for the above operation. ), The destination can be determined and switching can be performed. At this time, the routing information is pre-stored in the routing memory unit (not shown). In this case, the cell distribution switch unit 130 may perform a priority control operation for each ATM connection at the time of ATM cell transmission / reception according to routing information. The priority control operation may be divided into a priority for loss and a priority for transmission delay. In addition, the routing information may be stored in the routing memory unit by the controller 180 when the ATM call is set up through an IPC communication from a higher processor.

The first AAL processing unit 140 to the Nth AAL processing unit 170 each perform an AAL function on an ATM cell of an AAL type corresponding to the first AAL processing unit 140. At this time, the AAL function includes an ATM cell header analysis and conversion operation. In this case, the operation may be a VPI / VCI translation operation for input ATM cells and a multiplexing operation by disassembling and assembling an ATM cell. In addition, the first AAL processing unit 140 to the Nth AAL processing unit 170 switch the ATM cells distributed according to the corresponding AAL types to the cell distribution switch unit 130 again or to be outputted to the corresponding target port. . The first AAL processing unit 140 to the Nth AAL processing unit 170 may be implemented as a switch.

Meanwhile, the first AAL processor 140 to the Nth AAL processor 170 may be implemented by a digital signal processor. In this case, a physical signal matching unit is provided between each of the digital signal processors and the cell distribution switch unit 130 to perform transmission / reception signal matching at a physical level with respect to both input / output ports. If each of the digital signal processors themselves is provided with a port-specific interface with the cell distribution switch unit 130, the physical signal matching unit is not necessary.

The controller 180 controls and manages all functions of the ATM trunk interface device and performs IPC communication with other processors. That is, the controller 180 performs a control and management function for the operations of the first AAL processing unit 140 to the Nth AAL processing unit 170 and the cell distribution switch unit 130, and the ATM switch unit (not shown). IPC communication with the other side system (not shown) can be performed.

2 is a block diagram of an ATM trunk interface device according to another embodiment of the present invention in an ATM switching system. A description with reference to FIG. 1 is as follows.

2 is an ATM trunk interface device capable of simultaneously processing AA2 and AAL5 type ATM cells, bypasses AAL5 type user data, and performs processing for IPC cells and AAL2 type cells. The AAL2 is suitable for transmitting real-time traffic such as voice, and the AAL5 is suitable for transmitting non-real-time traffic such as file transfer or Internet search.

On the other hand, the cell distribution switch unit 230 separates the AAL type for the ATM cells from the ATM physical layer processing unit 210 or the bidirectional ATM cells passing through the ATM trunk interface and switches to the corresponding destination. In this case, the corresponding destination is a controller 260, an AAL2 processor 250, an ATM physical layer processor 210, a loop-back path 235, and a bypass path. If the corresponding ATM cell corresponds to an IPC (Inter Process Communication) cell, the cell distribution switch unit 130 transmits the same to the controller 260. In this case, when the input ATM cell corresponds to the AAL5 user data cell, the cell distribution switch unit 230 outputs the corresponding ATM cell to the corresponding destination via the bypass path without processing the ATM trunk interface device.

For example, if the ATM cell input from the ATM physical layer processor 210 is an AAL2 type, the cell distribution switch unit 230 may direct the ATM cell to the physical signal matching unit 240. (At this time, the physical signal matching unit 240 is an intermediate path from which the ATM cell goes to the AAL2 processing unit 250.) Also, the cell distribution switch unit 230 inputs the ATM cell to the IPC cell. In this case, the cell distribution switch unit 230 switches the corresponding ATM cell to an output port directed to the control unit 260. The cell distribution switch unit 230 switches to a loop-back port when the input ATM cell corresponds to a cell to be looped back. When the input ATM cell corresponds to a cell to be bypassed, the cell distribution switch unit 230 switches to a bypass port, that is, a port directed to the multiplexing / demultiplexing unit 270 of FIG. 2. Of course, the cell distribution switch unit 230 also performs the above switching operation on the ATM cell headed from the multiplexing / demultiplexing unit 270 to the ATM physical layer 210.

In addition, the cell distribution switch unit 230 may determine the destination and perform switching by using the VPI / VCI of the ATM cell as an index for the above operation. That is, the cell distribution switch unit 230 determines where the cell should be delivered by using the VPI / VCI of the input ATM cell as an index. At this time, the routing memory unit 220 pre-stores the routing information that is the basis of the determination. In addition, during the ATM call setup, the controller 260 receives the routing information from the higher processor through the IPC and stores the routing information in the routing memory 220.

In addition, when the cell distribution switch unit 230 determines a destination for the corresponding ATM cell, the cell distribution switch unit 230 is referred to according to a standard Utopia (Universal Test & Operations PHY Interface for ATM: UTOPIA) interface specification. The ATM cell can be output to the destination. In this case, the controller 260, the AAL2 processor 250, the ATM physical layer processor 210, the loop-back path 235 and the buffer for the bypass path is the standard UTOPIA interface standard. It is connected to the cell distribution switch unit 230 through.

In addition, the cell distribution switch unit 230 performs a priority control function in units of ATM connections. That is, the cell distribution switch unit 230 checks the routing memory unit 220 using the VPI / VCI of the input ATM cell as an index. The cell distribution switch unit 230 checks the priority class of the cell from the routing memory unit 220 and performs a switching operation according to the priority. At this time, the priority may be divided into a priority for loss and a priority for transmission delay, and when an ATM call is established, priority is determined in units of ATM connection.

The AAL2 processor 250 performs an AAL2 switching function on an AAL2 type ATM cell. At this time, the AAL2 switching function includes an ATM cell header analysis and conversion operation for an ATM cell. In this case, the operation may be a VPI / VCI translation operation for input ATM cells and a multiplexing operation by disassembling and assembling an ATM cell. The AAL2 processor 250 switches the AAL2 processed ATM cells back to the cell distribution switch unit 230 or to be outputted to the corresponding destination port. The AAL2 processor 250 may be implemented as a switch.

Meanwhile, the AAL2 processor 250 may be implemented as a digital signal processor. In this case, a physical signal matching unit 240 is provided between the AAL2 processor 250 and the cell distribution switch unit 230. The physical signal matching unit 240 performs transmission / reception signal matching at a physical level on the input / output ports of both the AAL2 processor 250 and the cell distribution switch unit 230. If the corresponding interface is provided in the AAL2 processor 250 itself, the physical signal matching unit 240 is not necessary.

In addition, as described above, when the cell distribution switch unit 230 conforms to the standard UTOPIA interface standard, the physical signal matching unit 240 performs transmission / reception signal matching at a physical level according to the standard UTOPIA interface standard. . Of course, if the standard UTOPIA interface standard is provided in the AAL2 processor 250 itself, the physical signal matching unit 240 is not necessary.

As described above, the physical signal matching unit 240 performs transmission / reception signal matching at a physical level with respect to the input / output ports of both the AAL2 processing unit 250 and the cell distribution switch unit 230. In addition, if the cell distribution switch unit 230 conforms to the standard UTOPIA interface standard, the corresponding device connected to the cell distribution switch unit 230 must also comply with the standard UTOPIA interface standard. However, in the exemplary embodiment of the present invention, since the physical signal matching unit 240 interfaces both sides, a plurality of AAL processing units may be connected even without conforming to the standard UTOPIA interface standard. Therefore, the device can be easily expanded.

The controller 260 performs a control and management function for all functions of the ATM trunk interface device and performs IPC communication with other processors. That is, the controller 260 performs control and management functions for the operations of the AAL 2 processor 250, the physical signal matcher 240, and the cell distribution switch unit 130, and the ATM switch unit (not shown). IPC communication with an opponent system (not shown) is performed.

In addition, the controller 260 may receive routing information necessary for call setup from an upper processor when setting up a corresponding ATM call and store the routing information in the routing memory 220. In addition, the controller 260 and the routing memory unit 220 may be connected through a general processor bus interface, and may be connected through an ATM connection.

On the other hand, if the controller 260 itself follows the standard UTOPIA interface standard (for example, 860SAR), the transmission / reception signal matching at the physical level for the input / output ports of both the controller 260 and the cell distribution switch 230 is performed. There is no need for this. However, if the controller 260 does not conform to the standard UTOPIA interface specification by itself, the corresponding physical signal matching unit performing the UTOPIA interface is required.

3 is a flowchart illustrating an ATM trunk interface method according to an embodiment of the present invention in an ATM switching system. Hereinafter, a description will be given with reference to FIGS. 1 and 2.

When the ATM cell is input in step 310, the cell distribution switch unit 130 identifies an AAL type for the input ATM cell and determines a destination in step 315. If the input ATM cell corresponds to the IPC processing cell, the cell distribution switch unit 130 transfers the input cell to the controller 180. In step 325, the controller 180 performs an IPC process. In this case, the IPC processing may be a control and management operation for the ATM trunk interface device. In addition, the controller 180 transfers the corresponding ATM cells subjected to the IPC process to the cell distribution switch 230 again.

If the input ATM cell corresponds to a plurality of types of AAL processing units provided in the ATM trunk interface device in step 315, the cell distribution switch unit 130 transfers the input cell to the corresponding AAL type switch unit in step 330. In step 335, the corresponding AAL type processor performs an AAL function for an input AAL type ATM cell. At this time, the AAL function includes an ATM cell header analysis and conversion operation, and may be a VPI / VCI translation operation for ATM cells and a far flexing operation by disassembling and assembling the ATM cell. The corresponding AAL type processor transfers the corresponding ATM cells distributed by the corresponding AAL types to the cell distribution switch unit 130 again.

In addition, when the input ATM cell corresponds to the bypass in step 340, the cell distribution switch unit 130 bypasses the input ATM cell to the corresponding destination in step 345. At this time, the bypassed ATM cell may be pure user data.

If the input ATM cell is not a bypass cell in step 340, the cell distribution switch unit 130 performs a corresponding operation in step 350. In this case, the corresponding operation may be a loop-back operation on an input ATM cell.

In step 355, the cell distribution switch unit 130 determines the destination of the distributed ATM cell from the controller 180 and the corresponding AAL type processing units, and outputs the corresponding ATM cell to the destination.

4 is a flowchart illustrating an ATM trunk interface method according to another embodiment of the present invention in an ATM switching system. Hereinafter, a description will be given with reference to FIGS. 1 and 2.

When the ATM cell is input in step 410, the cell distribution switch unit 230 checks the VPI / VCI for the input ATM cell in step 415. In operation 420, the cell distribution switch unit 230 performs a priority control operation. In this case, the priority may be divided into a priority for loss and a priority for transmission delay.

In step 425, the cell distribution switch unit 230 identifies an AAL type for the input ATM cell and determines a destination. In operation 430, when the input ATM cell corresponds to the IPC processing cell, the cell distribution switch unit 230 transmits the input ATM cell to the controller 260. In this case, the IPC processing cell may be an AAL5 IPC cell. In step 435, the controller 260 performs IPC processing. In this case, the IPC processing may be a control and management operation for the ATM trunk interface device. The controller 260 transmits the corresponding ATM cells having the IPC process back to the cell distribution switch unit 230.

In operation 440, when the input ATM cell corresponds to the AAL2 type, the cell distribution switch unit 230 transmits the input ATM cell to the physical signal matching unit 240. In operation 445, the physical signal matching unit 240 performs transmission / reception signal matching at a physical level for the input / output ports of both the AAL2 processor 250 and the cell distribution switch unit 230. In addition, the physical signal matching unit 240 transmits the signal matched ATM cell to the AAL2 processor 250.

In operation 450, the AAL2 processor 250 performs an AAL2 function. At this time, the AAL2 function includes an ATM cell header analysis and conversion operation, and may be a VPI / VCI translation operation for ATM cells and a far flexing operation by disassembling and assembling the ATM cell. The AAL2 processor 250 transfers the corresponding AAL2 processed ATM cells to the physical signal matching unit 240. In operation 455, the physical signal matching unit 240 performs transmission / reception signal matching at a physical level with respect to the input / output ports of both the AAL2 processor 250 and the cell distribution switch unit 230. In addition, the physical signal matching unit 240 transmits the signal matched ATM cell to the cell distribution switch unit 230.

If the input ATM cell corresponds to the bypass in step 460, the cell distribution switch unit 230 bypasses the input ATM cell to the corresponding destination in step 465. At this time, the bypassed ATM cell may be an AAL5 type user data ATM cell. In addition, the corresponding destination may be a counterpart system or an ATM switch.

If the input ATM cell does not correspond to the bypass in step 460, the cell distribution switch unit 230 performs the corresponding operation in step 470. In this case, the corresponding operation may be a loop-back operation.

In operation 475, the cell distribution switch unit 230 performs a priority control operation on the processed corresponding ATM cell from the control unit 260 and the physical signal matching unit 240. In operation 480, the cell distribution switch unit 230 determines a destination of the corresponding ATM cell. In operation 485, the cell distribution switch unit 230 outputs the corresponding ATM cell to the destination.

1 to 4, the present invention identifies an AAL type for an ATM cell input from an ATM switching system and switches to the corresponding destination. At this time, it can be seen that a high speed and efficient ATM trunk interface can be achieved by performing the corresponding IPC processing for the IPC processing cell and performing distributed processing for each AAL type. In this case, an interface for a plurality of AAL processing devices may be defined as needed, and in this case, it may be understood that there is an advantage of facilitating device expansion when using a standard interface standard.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention provides a high speed and efficient ATM trunk interface by separating different types of ATM cells inputted from an ATM switching system for each AAL type, and AAL processing unit for each type distributes the input ATM cells. There is this.

Claims (48)

In the A-T-M trunk interface device of the A-T-M exchange system, A cell distribution switch unit for switching an input A-T-M cell to a corresponding destination; The I-PC-processing cell of the input A-T-M cell is processed and transferred to the cell distribution switch unit again, and the control and maintenance operation of the A-T-M trunk interface device is performed. A controller to perform, The plurality of A-A-L-type As performing the corresponding A-A-L processing on the A-A-L type cells corresponding to them among the input A-T-M cells and transferring them to the cell distribution switch unit again. A-T-M trunk interface device of the A-T-M exchange system, characterized by consisting of A-L processing units. The method of claim 1, And a routing memory unit for storing routing information so that the cell distribution switch unit can determine a destination using the virtual path identifier / virtual channel identifier of the input A-T-M cell as an index. A-T-M trunk interface device of the M exchange system. The method of claim 2, wherein the control unit, When the A-T-M call is established, the corresponding routing information is received from the upper processor through the I-PC communication and stored in the routing memory unit. -M trunk interface device. The method of claim 3, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the priority control function for the input A-T-M cell to switch to the corresponding destination. The method of claim 4, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the pure user data bypasses when switching the input A-T-M cell. The method of claim 5, wherein the A-A-L treatment, A-T-M exchange system characterized in that the virtual path identifier / virtual channel identifier translation operation for the input A-T-M cell and multiplexing operation by disassembling and assembling the A-T-M cell T-M trunk interface device. In the A-T-M trunk interface device of the A-T-M exchange system, A cell distribution switch unit for switching an input A-T-M cell to a corresponding destination; The I-PC-processing cell of the input A-T-M cell is processed and transferred to the cell distribution switch unit again, and the control and maintenance operation of the A-T-M trunk interface device is performed. A controller to perform, The plurality of A-A-L-type As performing the corresponding A-A-L processing on the A-A-L type cells corresponding to them among the input A-T-M cells and transferring them to the cell distribution switch unit again. A-T-M trunk interface device of the A-T-M exchange system, characterized in that it consists of A-L switch parts. The method of claim 7, wherein And a routing memory unit for storing routing information so that the cell distribution switch unit can determine a destination using the virtual path identifier / virtual channel identifier of the input A-T-M cell as an index. A-T-M trunk interface device of the M exchange system. The method of claim 8, wherein the control unit, When the A-T-M call is established, the corresponding routing information is received from the upper processor through the I-PC communication and stored in the routing memory unit. -M trunk interface device. The method of claim 9, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the priority control function for the input A-T-M cell to switch to the corresponding destination. The method of claim 10, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the pure user data bypasses when switching the input A-T-M cell. The method of claim 11, wherein the A-A-L treatment, A-T-M exchange system characterized in that the virtual path identifier / virtual channel identifier translation operation for the input A-T-M cell and multiplexing operation by disassembling and assembling the A-T-M cell T-M trunk interface device. In the A-T-M trunk interface device of the A-T-M exchange system, A cell distribution switch unit for switching an input A-T-M cell to a corresponding destination; The I-PC-processing cell of the input A-T-M cell is processed and transferred to the cell distribution switch unit again, and the control and maintenance operation of the A-T-M trunk interface device is performed. A controller to perform, The plurality of A-A-L-type As performing the corresponding A-A-L processing on the A-A-L type cells corresponding to them among the input A-T-M cells and transferring them to the cell distribution switch unit again. A-L processors, And a plurality of physical signal matching units which perform transmission / reception signal matching at a physical level between the cell distribution switch unit and each of the A-A-L processing units. A-T-M trunk interface device. The method of claim 13, And a routing memory unit for storing routing information so that the cell distribution switch unit can determine a destination using the virtual path identifier / virtual channel identifier of the input A-T-M cell as an index. A-T-M trunk interface device of the M exchange system. The method of claim 14, wherein the control unit, When the A-T-M call is established, the corresponding routing information is received from the upper processor through the I-PC communication and stored in the routing memory unit. -M trunk interface device. The method of claim 15, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the priority control function for the input A-T-M cell to switch to the corresponding destination. The method of claim 16, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the pure user data bypasses when switching the input A-T-M cell. 18. The method of claim 17, wherein the A-A-L treatment is A-T-M exchange system characterized in that the virtual path identifier / virtual channel identifier translation operation for the input A-T-M cell and multiplexing operation by disassembling and assembling the A-T-M cell T-M trunk interface device. In the A-T-M trunk interface device of the A-T-M exchange system, A cell distribution switch unit for switching an input A-T-M cell to a corresponding destination; The I-PC-processing cell of the input A-T-M cell is processed and transferred to the cell distribution switch unit again, and the control and maintenance operation of the A-T-M trunk interface device is performed. A controller to perform, The plurality of A-A-L-type As performing the corresponding A-A-L processing on the A-A-L type cells corresponding to them among the input A-T-M cells and transferring them to the cell distribution switch unit again. A-L switch unit, And a plurality of physical signal matching units for performing transmission / reception signal matching at a physical level between the cell distribution switch unit and each of the A-A-L switch units. A-T-M trunk interface device. The method of claim 19, And a routing memory unit for storing routing information so that the cell distribution switch unit can determine a destination using the virtual path identifier / virtual channel identifier of the input A-T-M cell as an index. A-T-M trunk interface device of the M exchange system. The method of claim 20, wherein the control unit, When the A-T-M call is established, the corresponding routing information is received from the upper processor through the I-PC communication and stored in the routing memory unit. -M trunk interface device. The method of claim 21, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the priority control function for the input A-T-M cell to switch to the corresponding destination. The method of claim 22, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the pure user data bypasses when switching the input A-T-M cell. The method of claim 23, wherein the A-A-L treatment, A-T-M exchange system characterized in that the virtual path identifier / virtual channel identifier translation operation for the input A-T-M cell and multiplexing operation by disassembling and assembling the A-T-M cell T-M trunk interface device. In the A-T-M trunk interface device of the A-T-M exchange system, A cell distribution switch unit for switching an input A-T-M cell to a corresponding destination using a standard interface standard; The I-PC-processing cell of the input A-T-M cell is processed and transferred to the cell distribution switch unit again, and the control and maintenance operation of the A-T-M trunk interface device is performed. A controller to perform, The plurality of A-A-L-type As performing the corresponding A-A-L processing on the A-A-L type cells corresponding to them among the input A-T-M cells and transferring them to the cell distribution switch unit again. A-L processors, And a plurality of interface matching units which perform transmission / reception signal matching between the cell distribution switch unit and each of the A-A processing units according to the standard interface standard. A-T-M trunk interface device. The method of claim 25, And a routing memory unit for storing routing information so that the cell distribution switch unit can determine a destination using the virtual path identifier / virtual channel identifier of the input A-T-M cell as an index. A-T-M trunk interface device of the M exchange system. The method of claim 26, wherein the control unit, When the A-T-M call is established, the corresponding routing information is received from the upper processor through the I-PC communication and stored in the routing memory unit. -M trunk interface device. The method of claim 27, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the priority control function for the input A-T-M cell to switch to the corresponding destination. The method of claim 28, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the pure user data bypasses when switching the input A-T-M cell. The method of claim 29, wherein the A-A-L treatment, A-T-M exchange system characterized in that the virtual path identifier / virtual channel identifier translation operation for the input A-T-M cell and multiplexing operation by disassembling and assembling the A-T-M cell T-M trunk interface device. In the A-T-M trunk interface device of the A-T-M exchange system, A cell distribution switch unit for switching an input A-T-M cell to a corresponding destination using a standard interface standard; The I-PC-processing cell is transferred from the input A-T-M cell to the cell distribution switch unit, and the control and maintenance operation of the A-T-M trunk interface device is performed. A controller to perform, The plurality of A-A-L-type As performing the corresponding A-A-L processing on the A-A-L type cells corresponding to them among the input A-T-M cells and transferring them to the cell distribution switch unit again. A-L switch unit, A-T-M exchange system comprising the plurality of interface matching unit for performing the standard interface transmission / reception signal matching between the cell distribution switch unit and each of the A-A-L switch unit T-M trunk interface device. The method of claim 31, wherein And a routing memory unit for storing routing information so that the cell distribution switch unit can determine a destination using the virtual path identifier / virtual channel identifier of the input A-T-M cell as an index. A-T-M trunk interface device of the M exchange system. The method of claim 32, wherein the control unit, When the A-T-M call is set, the corresponding routing information is received and stored in the routing memory unit through the I-P-C communication from an upper processor. -M trunk interface device. The method of claim 33, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the priority control function for the input A-T-M cell to switch to the corresponding destination. 35. The method of claim 34, wherein the cell distribution switch unit, The A-T-M trunk interface device of the A-T-M exchange system, characterized in that the pure user data bypasses when switching the input A-T-M cell. The method of claim 35, wherein the A-A-L treatment, A-T-M exchange system characterized in that the virtual path identifier / virtual channel identifier translation operation for the input A-T-M cell and multiplexing operation by disassembling and assembling the A-T-M cell T-M trunk interface device. In the A-T-M trunk interface method of the A-T-M exchange system, A first process of identifying the A-A-L type of the input A-T-M cell, If the input A-T-M cell corresponds to an I-PC-process, performing a corresponding I-PC-process; A third process of performing A-A-L processing by distributing by A-A-L type when the A-A-L type processing is provided with the A-A-L type of the input A-T-M cell; and, The A-T-M trunk interface method of the A-T-M exchange system, characterized in that the fourth process for outputting the A-T-M cell processed in the second process and the third process to the destination. The method of claim 37, wherein the first process, A-T-M trunk interface method of the A-T-M exchange system, characterized by identifying the A-A-L type by using the virtual path identifier / virtual channel identifier of the input A-T-M cell as an index . The method of claim 38, wherein the first process, A-T-M trunk interface method of the A-T-M exchange system, characterized in that performed by the corresponding routing information received through the I-PC communication from the upper processor when the A-T-M call is set up . The method of claim 39, wherein the first process, A-T-M trunk interface method of the A-T-M exchange system, characterized in that for performing the priority control operation for the input A-T-M cell. The method of claim 40, And a fifth process of bypassing the input A-T-M cell to the corresponding destination if the input A-T-M cell corresponds to pure user data. 42. The method of claim 41 wherein the A-A-L treatment is The virtual path identifier / virtual channel identifier translation operation for the input A-T-M cell and the multiplexing operation through disassembly and assembly of the A-T-M cell are performed. T-M trunk interface method. In the A-T-M trunk interface method of the A-T-M exchange system, A first process of identifying the A-A-L type of the input A-T-M cell and switching to a standard interface standard; A second process of performing the corresponding I-PC-process when the corresponding A-T-M cell corresponds to the I-PC-process after performing the first process; A third step of performing transmission / reception signal matching with the standard interface standard if the A-A-L type processing is provided with the A-A-L type of the corresponding A-T-M cell after performing the first process; Process, A fourth process of performing A-A-L processing by distributing the corresponding A-T-M cells by A-A-L type; And a fifth process of outputting the corresponding A-T-M cell processed in the second process and the fourth process to the corresponding destination. The method of claim 43, wherein the first process, A-T-M trunk interface method of the A-T-M exchange system, characterized by identifying the A-A-L type by using the virtual path identifier / virtual channel identifier of the input A-T-M cell as an index . The method of claim 44, wherein the first process, A-T-M trunk interface method of the A-T-M exchange system, characterized in that performed by the corresponding routing information received through the I-PC communication from the upper processor when the A-T-M call is set . The method of claim 45, wherein the first process, A-T-M trunk interface method of the A-T-M exchange system, characterized in that for performing the priority control operation for the input A-T-M cell. The method of claim 46, And a sixth step of bypassing the input A-T-M cell to the corresponding destination if the input A-T-M cell corresponds to pure user data. 48. The method of claim 47, wherein the A-A-L treatment is The virtual path identifier / virtual channel identifier translation operation for the input A-T-M cell and the multiplexing operation through disassembly and assembly of the A-T-M cell are performed. T-M trunk interface method.