KR100402534B1 - Apparatus of Interfacing Asymmetric Digital Subscriber Line Subscribers in the Asynchronous Transfer Mode Multiplex System - Google Patents

Abstract

The present invention relates to an ADSL subscriber matching device in an ATM multiplexing system. In particular, the present invention relates to an ADSL subscriber matching device. In particular, the present invention provides a multimedia service by maximizing transmission distance, speed, and bandwidth to an end subscriber by using an existing telephone subscriber line. The present invention relates to an ADSL subscriber matching device in an ATM multiplexing system.

According to the present invention, an ADSL subscriber matching unit for matching an ADSL subscriber to process an ADSL modem function, an ATM physical layer processing unit for processing physical functions of an ATM cell and transmitting and receiving with the ADSL subscriber matching unit, and the ATM physical layer processing unit A reception cell control unit for controlling the operation of the received cell and the test cell, a test FIFO unit for performing a loop test of the board itself under the control of the receiving cell control unit, and an ADSL subscriber under control of the receiving cell control unit ETM including a receiving cell FIFO unit for storing a receiving cell of a receiving cell, a transmitting cell control unit controlling an operation of a transmitting cell to an ADSL subscriber side, and a transmitting cell FIFO unit storing a transmitting cell under control of the transmitting cell control unit. ADSL matching device in a multiplexing system, which processes an OAM cell received from each ADSL subscriber or ATM network side OAM processing unit for the; A cell multiplexing / demultiplexing unit for multiplexing a cell applied through the receiving cell FIFO unit, analyzing and demultiplexing a routing index of a cell received from an ATM network side, and applying the demultiplexing unit to the transmitting cell controller; A cell bus matching unit for matching a communication bus with an ATM network side and performing local switching between the ADSL subscriber matching devices; Perform cell recognition and ATM layer functions for cell headers applied through the cell multiplexer / demultiplexer and cell bus matcher, and perform VPI conversion, VPI / VCI conversion, cell bus routing, header insertion, and ATM cell header conversion. It includes an ATM layer processing unit and a VPI / VCI address conversion unit for allocating new VPI / VCI values and granting channel-specific primitives using a lookup table for each channel.

Description

Apparatus of Interfacing Asymmetric Digital Subscriber Line Subscribers in the Asynchronous Transfer Mode Multiplex System}

The present invention relates to an ADSL subscriber matching device in an ATM multiplexing system. In particular, the present invention relates to an ADSL subscriber matching device. In particular, the present invention provides a multimedia service by maximizing transmission distance, speed, and bandwidth to an end subscriber by using an existing telephone subscriber line. The present invention relates to an ADSL subscriber matching device in an ATM multiplexing system.

In a typical ATM multiplexing system, an ADSL subscriber matching device processes a transmitting cell, which is downlink data received from an upper layer ATM layer processing device, and delivers it to an ADSL subscriber, and receives a receiving cell, which is an uplink data received from the corresponding ADSL subscriber. To deliver the ATM to the corresponding ATM layer processing device.

As shown in FIG. 1, the ADSL subscriber matching device includes the ADSL processor 11, the ATM physical layer processor 12, the central controller 13, the test cell reception FIFO unit 14, and the test. Cell transmission FIFO unit 15, reception cell control unit 16, reception cell FIFO unit 17, control signal matching unit 18, transmission cell FIFO unit 19, transmission cell control unit 20 And a VPI / VCI table unit 21 and a transmission / reception cell bus matching unit 22.

The operation of the ADSL subscriber matching device configured as described above will be described as follows.

First, the transmission cell processing operation receives a transmission cell composed of 37 (Bytes) through the transmission / reception cell bus matching unit 22 as shown in FIG. 2 under the control of the transmission cell control unit 20, and then performs a board bit map. Check the Bit Map, and if the bit of the board number that is owned is set, the cell is received and converted into the corresponding transmitting cell.

Then, in the case of a point-to-point transmission cell by checking the 'M' bit and transmitting it to one of the transmission cell FIFO units 19 for each subscriber according to the line number (LN), the point-to-multipoint transmission cell In this case, the contents of the VPI / VCI table unit 21 are read with reference to MPID (Multi Point Identification), and the VPI and VCI are converted into a predetermined value and stored in the FIFO corresponding to the corresponding subscriber among the corresponding transmission cell FIFO units 19. And transfers it to the ATM physical layer processing unit 12.

In addition, the ATM physical layer processing unit 12 generates a cell scrambling, a HCS (Header Control Sequence) generation / insertion / check, a pause / unassigned cell for a transmission cell applied through the transmission cell FIFO unit 19. It performs / extracting function and maintains ADSL link connection by transmitting idle / unassigned cell automatically when there is no user cell.

In addition, the ADSL processor 11 processes an ADSL physical layer function.

Secondly, the receiving cell processing operation receives a 40 (Byte) cell and adds a 37 (Byte) receiving cell to which a board number and a subscriber line number are added, as shown in FIG. 3. ) And pass it to the upper layer ATM layer processing unit. Here, 'BDID' is an abbreviation of Board Identifier.

At this time, the transmit / receive cell bus matching unit 22 forms a loop back test path under the control of the receiving cell control unit 16, and the corresponding loopback test path is synchronized with the cell bus clock to match the transmit / receive cell bus match. It is matched with the part 22.

In addition, the control signal matching unit 18 performs a matching operation for communicating with an ATM layer processing apparatus, which is a higher board, and has a dual port random access memory (DPRAM) therein so that the board is mounted and loopback controlled. Exchange information such as alarm status and VPI / VCI table information conversion.

As described above, in the ATM multiplexing system of the prior art, the ADSL subscriber matching device is configured to be processed by another board because the ATM physical layer unit, the ATM layer unit, and the OAM processing unit are separated, and the corresponding ATM layer unit has a centralized structure. As the load on the processor increases, there is a possibility that the processing efficiency of the ATM cell may be reduced, and the two-step process of the subscriber board and the control board may be performed by multiplexing and demultiplexing the ATM cell, which may cause cell processing delay and loss. In addition, since the cell bus of the transmitting / receiving cell bus matching unit is separated into two transmitting and receiving buses, communication can reduce reliability such as noise resistance of the backboard due to excessive signal lines, and local switching with other boards in the block is impossible. There was this.

The present invention is to solve the disadvantages or problems described above and to overcome the limitations of the data service using the telephone line of the existing voice band, in particular to be suitable for high-speed data services, such as the Internet (Internet), which is increasing explosively In order to solve crosstalk and interference by using the existing telephone subscriber line as it is, it is connected to the ATM network to maximize the transmission distance, speed, and bandwidth to the end subscriber, thereby solving service bottlenecks and public old telephone service (POTS). And to provide an ADSL subscriber matching device in an ATM multiplexing device designed to enable multimedia services such as high-speed Internet access and high-speed data service.

1 is a block diagram illustrating an Asymmetric Digital Subscriber Line (ADSL) subscriber matching device in a conventional Asynchronous Transfer Mode (ATM) multiplexing system.

FIG. 2 is a diagram illustrating a format of a transmitting cell in FIG. 1. FIG.

3 illustrates the format of a receiving cell in FIG.

4 is a block diagram illustrating an ADSL subscriber matching device in an ATM multiplexing system according to an embodiment of the present invention;

Explanation of symbols on the main parts of the drawings

31: ADSL subscriber matching unit 32: ATM physical layer processing unit

33: reception cell control unit 34: test FIFO unit (Test First In First Out)

35: reception cell FIFO section 36: transmission cell FIFO section

37: transmission cell control unit

38: OAM processing unit (Operation Administration and Maintenance)

39: processor portion 40: memory portion

41: logic controller 42: cell multiplexer / demultiplexer

43: ATM layer processing unit 44: cell bus matching unit

45: VPI / VCI (Virtual Path Identifier / Virtual Channel Identifier) address translation unit

46: ADSL subscriber control unit

47: IPC (Inter Processor Communication)

The present invention relates to a central office terminal (COT) of a subscriber matching device for providing ADSL service in an ATM multiplexing device. The ATM can accommodate various types of subscribers in a small area and match it with an ATM network to accommodate an ATM service. The multiplexing device makes full use of existing subscriber lines to provide high-speed data services. Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the ATM multiplexing system according to an embodiment of the present invention, the ADSL subscriber matching apparatus includes an ADSL subscriber matching unit 31, an ATM physical layer processing unit 32, and a receiving cell controller (as shown in FIG. 4). 33, test FIFO unit 34, receiving cell FIFO unit 35, transmission cell FIFO unit 36, transmission cell control unit 37, OAM processing unit 38, processor unit 39 And a memory unit 40, a logic control unit 41, a cell multiplexing / demultiplexing unit 42, an ATM layer processing unit 43, a VPI / VCI address conversion unit 45, and a cell bus matching unit. 44, an ADSL subscriber controller 46, and an IPC unit (Inter Processor Communication) 47.

The ADSL subscriber matching unit 31 matches an ADSL subscriber to process an ADSL modem function of asymmetrically transmitted and received data, and transmits and receives status and control information through the ADSL subscriber controller 46 using a serial channel.

The ATM physical layer processor 32 processes physical functions of an ATM cell such as bit time information of a received cell, cell separation, cell delineation identification, cell scrambling, and HEC (Header Error Check) signal generation check. It plays a role.

The receiving cell control unit 33 controls the operation of the test FIFO unit 34 and the receiving cell FIFO unit 35, and performs control operations for the test cell and the receiving cell.

The test FIFO unit 34 allows the processor unit 39 to make and transmit a test cell for a loop test of the board itself under the control of the receiving cell control unit 33.

The receiving cell FIFO unit 35 stores the cell received from the ADSL subscriber under the control of the receiving cell control unit 33 and applies it to the cell multiplexing / demultiplexing unit 42 as appropriate.

The transmitting cell FIFO unit 36 sets the priority level under the control of the transmitting cell control unit 37 and transmits the cell applied from the cell multiplexing / demultiplexing unit 42 to the ADSL subscriber in sequence. Save the cell.

The transmitting cell controller 37 controls the operation of the transmitting cell FIFO unit 36 to perform a control operation on the transmitting cell.

The OAM processing unit 38 performs a function of processing an OAM cell received from each ADSL subscriber or an ATM network, and analyzes the OAM information of the ATM cell received from the ATM physical layer processing unit 32 or an ATM network and transmits the OAM cell. The cell FIFO unit 36 performs counting and performance monitoring of a cell applied through the cell FIFO unit 36 to report to a higher processor. In addition, the OAM processor 38 may be configured to manage fault management, performance management, activation and deactivation, resource management, and alerting of an OAM cell processing function. Handles the Alarm Indication Signal / Remote Defect Indication (RDI) function.

The processor unit 39 and the memory unit 40 store various programs and perform operations and functions of the device according to the corresponding program.

The logic control section 41 provides a signal suitable for controlling devices of various building blocks.

The cell multiplexer / demultiplexer 42 multiplexes or demultiplexes a cell received from an ADSL subscriber or a Synchronous Transport Module (STM) -1 matching unit and transmits the cell to the ATM layer processor 43 or an ADSL subscriber. Multiplex the cells received by the ADSL subscriber matching unit 31 and send them to the ATM layer processing unit 43 so that the cells received from the ATM layer processing unit 43 can be analyzed and transmitted to the corresponding ADSL subscriber lines. Perform the multiplexing function.

The ATM layer processing unit 43 and the VPI / VCI address conversion unit 45 are composed of a receiving ATM layer processing unit 43-2 and a transmitting ATM layer processing unit 43-1, and the cell multiplexing / demultiplexing unit 42 Monitors the cell received through UPC (Usage Parameter Control) and adds routing information or header translation / extraction, VPI / VCI address translation to a cell that does not violate the traffic contract. 44), and analyzes the cell received from the cell bus matching unit 44 to check whether it is a virtual path connection (VPC) or a virtual channel connection (VCC), and checks and transmits the corresponding ADSL subscriber. do. That is, the ATM layer processing unit 43 performs an ATM layer function and has a cell recognition function for an input cell header, and together with the VPI / VCI address conversion unit 45, VPI conversion, VPI / VCI conversion, and cell bus. Routing, header insertion, and ATM cell header conversion are performed by using a look-up table for each channel to assign new VPI / VCI values and grant channel primitives.

The cell bus matching unit 44 includes a cell inlet 44-1, a bus arbiter 44-2, an inlet queue 44-3, and a cell bus logic interface. A cell bus logic interface 44-4, an outlet queue 44-5, and a cell outlet 44-6 are provided. The cell bus matching unit 44 formats a cell received from the receiving ATM layer processing unit 43-2 through the corresponding cell inlet 44-1 so as to match the cell bus format accordingly. The cell bus is controlled by the bus arbiter 44-2 and transmitted to the board performing the 155M STM-1 function through the STM-1 matching unit, and the cell bus is controlled by the bus arbiter 44-2. When the bus is occupied through the logic interface 44-4, the cell received by the cell bus is transmitted to the transmitting ATM layer processor 43-1 through the corresponding cell outlet 44-6. That is, the cell bus matching unit 44 enables local switching between an STM-1 matching unit using a single cell bus, i.e., the same bus, a communication bus matching, and an internal ADSL subscriber matching unit of an ATM multiplexer.

The ADSL subscriber controller 46 analyzes information of various OAM cells and reports a line state, a board mounting state, a loopback control state, and an alarm occurrence state of the ADSL subscriber to the processor board.

The IPC unit 47 serves as a medium for transmitting and receiving maintenance and signaling information with a higher processor.

The operation of the ADSL subscriber matching device in the ATM multiplexing system according to the embodiment of the present invention configured as described above is as follows.

First, the operation from the ADSL subscriber side to the ATM network side is described.

The ADSL subscriber is matched to the ADSL subscriber matching unit 31. The ADSL subscriber matching unit 31 performs a modem function of asymmetrically transmitted data using an ADSL modem similar to a dial up modem. It provides a high speed data transmission channel with 1 ~ 8 (Mbps) downlink and 16 (Kbps) ~ 1 (Mpbs) downlink, and handles long distance transmission. In addition, the corresponding ADSL subscriber matching unit 31 processes the physical layer and transmits and receives status and control information through the ADSL subscriber control unit 46 using a serial channel.

In addition, the ATM physical layer processing unit 32 that processes the physical functions of the ATM cell performs cell scrambling, HCS generation / insertion / checking, idle / unassigned cell insertion / extraction, and the like for the transmitting and receiving cells. When there is no user cell, the idle / unassigned cell is automatically transmitted to the ADSL subscriber matching unit 31 to maintain the link connection of the ADSL.

At this time, when the cell multiplexing / demultiplexing unit 42 receives a transmission notification signal indicating that there is a cell to be transmitted from each ADSL subscriber, the cell multiplexing / demultiplexing unit 42 receives the corresponding transmission notification signal by the ATM layer. The receiver ATM layer processor 43-2 applies a reception permission signal indicating that the cell can be received to the cell multiplexer / demultiplexer 42.

Accordingly, the cell multiplexing / demultiplexing unit 42 applies a transmission command signal to the receiving cell control unit 33 to transmit cells in the order of priority ADSL subscribers, and the corresponding receiving cell control unit 33 enables reception. Send a signal to an ADSL subscriber.

Thereafter, under the control of the receiving cell control unit 33, cells applied from the ADSL subscriber receiving the receiving enable signal are sequentially stored in the receiving cell FIFO unit 35, and the corresponding stored cell (that is, the receiving cell). ) Is applied to the cell multiplexer / demultiplexer 42 together with the reception notification signal.

Then, the cell multiplexing / demultiplexing unit 42 multiplexes the cell information of each ADSL subscriber applied through the receiving cell FIFO unit 35 and then stores the corresponding multiplexed cell information together with the receiving cell acknowledgment signal. To the hierarchical processing unit 43-2.

Accordingly, the receiving ATM layer processor 43-2 analyzes the VPI / VCI of the multiplexed cell header to determine whether it is a VPC or a VCC, and extracts a connection identifier through the VPI / VCI address translator 45. Then, the extracted connection identifier, cell synchronization signal, valid cell signal, and the like are examined to discard or tag the cells that violate the parameter, and perform spacing according to the user's selection.

In addition, the ATM layer processor 43 has a function of recognizing a specific cell such as a physical layer cell, an unassigned cell, an OAM, etc. with respect to the cell header, and the VPI / VCI for the corresponding physical layer cell and the unassigned cell. Instead of performing an address translation operation by the lookup table of the address translation unit 45, the address translation unit 45 performs an address value previously assigned by the processor. In this case, the specific cell performs filtering on all cells input as cells having a specific header pattern in the VPI, VCI, and PT (Payload Type) fields, and whether to search the lookup table is determined by the processor. Control is possible.

Cells applied to the cell inlet 44-1 in the cell bus matching unit 44 through the receiving ATM layer processing unit 43-2 are converted into the VPI / VCI address conversion unit 45 by conversion control. When the VPI number is converted, the VPI number and the routing header are included in the VPI translation record area.In case of VPI / VCI conversion, the VPI number and routing header are converted. The routing header is also included in the VPI and VCI translation record fields.

At this time, the VPI / VCI address conversion unit 45 performs VPI conversion and VPI / VCI conversion operation according to the information type of the cell and inserts the appropriate routing header information according to whether there is transmission to the ATM network side or the ADSL subscriber side. The inlet queue 44-3 provided in the cell bus matching section 44 is transmitted.

The cell bus matching unit occupies the cell bus ports in the order in which the bus occupancy is first requested by the control of the bus arbiter 44-2 provided in the cell bus matching unit 44. (44) The cell bus logic interface 44-4 provided therein transmits ATM cell data having a standard cell bus format to the STM-1 matching unit that matches the ATM network side through the cell bus.

Here, the cell bus access shared by each cell bus matching unit 44 is controlled by the bus arbiter 44-2. First, the cell bus matching unit 44 which has requested cell bus occupancy. Is received after receiving an acknowledgment (ACK) on the cell bus from the other side. In this case, only one bus arbiter 44-2 is enabled, and a switching capacity of the corresponding cell bus is maximum 1.2 (Gbps) ATM using a 45 (MHz) clock on a 32 (Bit) data bus. Has cell bandwidth.

Next, the operation from the ATM network side to the ADSL subscriber side is described.

When an ATM cell having a standard cell bus format is received from the STM-1 matching unit through a cell bus, the cell bus matching unit 44 performs a cell address screen to recognize the type of cell and to determine routing information. Extract the routing index to get

In this case, the VPI / VCI address translator 45 and the transmitting ATM layer processing unit 43-1 are route tagged and stored in the outlet queue 44-5 provided in the cell bus matching unit 44. After matching, the data is applied to the transmitting ATM layer processor 43-1 through the port of the cell outlet 44-6 provided in the cell bus matching unit 44.

Accordingly, the cell received by the transmitting ATM layer processing unit 43-1 analyzes a cell header together with the VPI / VCI address conversion unit 45 similarly to the processing of the receiving ATM layer processing unit 43-2 described above. And assigns VPI / VCI value by using lookup table for each ATM channel and gives primitives for each channel.Routing index is used as internal routing information to process ATM cell and user cell, OAM cell for each received cell unit. Differential processing is performed according to types of meta signal cells, relay cells, and duplicate cells.

For example, when the type of the cell is a user cell, the cell is counted, performance monitoring is performed, and the cell is a cell to be transmitted to the ATM physical layer processor 32 and transmitted to an ADSL subscriber, or the cell is looped. The cell multiplexer / demultiplexer 42 determines whether the cell is to be applied to the receiving ATM layer processor 43-2, and stores the cell in a buffer of the corresponding configuration block.

In the cell data received by the demultiplexing side of the cell multiplexing / demultiplexing unit 42, first, whether each ADSL subscriber is in a state capable of receiving the corresponding cell data is detected, and the transmitting ATM layer processing unit 43-1 is performed. It determines whether to send the routing information received from the ADSL subscriber to the ADSL subscriber, and checks the input of the processor-determined subscriber, and transmits the cell data under the control of the transmitting cell controller 37 to the corresponding subscriber of the transmitting cell FIFO unit 36. After storing in the area, the ATM physical layer processing unit 32 performs the ATM physical layer processing and transmits it to the ADSL subscriber.

At this time, the processing of the ATM physical layer performs a function similar to the reception process described above, in order to prevent cell loss in the transmission direction, in the transmitting cell FIFO unit 36 and the cell multiplexing / demultiplexing unit 42. A buffer, a buffer in the ATM layer processor 43, etc. are always checked, and when a cell is transmitted in the transmission direction, the cell transmission is stopped in the opposite direction when a part is not available anymore to perform a write operation. A back flash signal is sent to keep the cell flow smoothly.

In addition, the ADSL subscriber control unit 46 identifies the line state of each ADSL subscriber, reports the alarm state of the board, the loop back state, etc. to the upper processor board through the IPC unit 47, and registers and deletes various connections. Allows you to perform parameter settings.

In addition, the IPC unit 47 may transmit and receive address signals, data signals, and write / read signals to a parallel bus using DPRAM (Dual Port Random Access Memory) to exchange maintenance and signaling information with an upper processor. give.

In addition, the OAM processing unit 38 analyzes OAM information of the ATM cell received from the ATM physical layer processing unit 32 or the ATM network and performs a maintenance function. Particularly, the OAM processing unit 38 performs cell counting through the transmitting cell FIFO unit 36. And perform an operation monitoring function to report to a higher processor. The OAM processing unit 38 processes error management, operation management, activation and deactivation, resource management function, and alarm (AIS / RDI) function of the OAM cell processing function.

Also, the test FIFO unit 34 checks the test cell generated by the processor unit 39 in order to check whether each section of the matching board is normal under the control of the reception cell control unit 33. ), A loop back test applied to blocks such as a cell multiplexing / demultiplexing unit 42, an ATM layer processing unit 43, a cell bus matching unit 44, and the like, confirms a connection state between each component.

As described above, in the ATM multiplexing system, the ADSL subscriber matching apparatus analyzes OAM information of an ATM cell received from an ATM physical layer processor or an ATM network, performs a counting and operation monitoring function of the corresponding ATM cell, and executes an upper processor. The OAM processing unit that handles the error management, operation management, activation and deactivation, resource management function, and alarm termination function of the processing function of the OAM cell and the cell received through the ADSL subscriber matching unit are multiplexed to the ATM layer processing unit. And a cell multiplexing / demultiplexing unit for performing a demultiplexing function to analyze each routing index and transmit the cell received from the ATM layer processing unit to a corresponding ADSL subscriber line, and performs an ATM layer function and recognizes an ATM cell with respect to a cell header. VPI conversion, VPI / VCI conversion, cell bus routing, header insertion, and ATM cell header conversion on a per channel basis Communication bus matching with ATM layer processing unit, VPI / VCI address translator, and STM-1 matching unit using single cell bus is possible by using lookup table to assign new VPI / VCI values, grant channel-specific primitives, etc. And a cell bus matching unit that enables local switching between ADSL subscriber matching devices in the ATM multiplexing system. Therefore, the distributed structure that enables the ATM physical layer and the ATM layer in the ATM subscriber matching device enables efficient traffic processing and Can perform management, reduce transmission path access procedure, reduce cell load and improve cell processing speed by batching cell multiplexing / demultiplexing in ADSL subscriber matching device, high speed cell bus Delivers communication media and provides full bandwidth to ensure throughput of 1.2 (Gbps) Number, and it may perform a diagnosis of the maintenance functions to process the OAM function in the ADSL Subscriber Line device.

Claims (5)

An ADSL subscriber matching unit for matching ADSL subscribers and processing ADSL modem functions, an ATM physical layer processing unit for processing physical functions of an ATM cell and transmitting and receiving to and from the ADSL subscriber matching unit, and receiving received through the ATM physical layer processing unit A reception cell control unit for controlling the operation of the cell and the test cell, a test FIFO unit for performing a loop test of the board itself under control of the reception cell control unit, and a reception cell from an ADSL subscriber under control of the reception cell control unit. AD in the AT multiplex system having a receiving cell FIFO unit for storing, a transmitting cell control unit for controlling an operation of a transmitting cell to an ADSL subscriber side, and a transmitting cell FIFO unit for storing a transmitting cell under control of the transmitting cell control unit. In the SL subscriber matching device, An OAM processing unit for processing an OAM cell received from each ADSL subscriber or ATM network side; A cell multiplexing / demultiplexing unit for multiplexing a cell applied through the receiving cell FIFO unit, analyzing and demultiplexing a routing index of a cell received from an ATM network side, and applying the demultiplexing unit to the transmitting cell controller; A cell bus matching unit for matching a communication bus with an ATM network side and performing local switching between the ADSL subscriber matching devices; Perform cell recognition and ATM layer functions for cell headers applied through the cell multiplexer / demultiplexer and cell bus matcher, and perform VPI conversion, VPI / VCI conversion, cell bus routing, header insertion, and ATM cell header conversion. ADSL subscriber matching device in an ATM multiplexing system comprising an ATM layer processing unit for allocating a new VPI / VCI value using a lookup table for each channel and granting channel-specific primitives, and a VPI / VCI address translator. The method of claim 1, An IPC unit for transmitting and receiving address signals, data signals, and write / read signals to a parallel bus using DPRAM to transmit and receive maintenance and signaling information with an upper processor board; AMT, characterized in that it further comprises an ADSL subscriber control unit for analyzing the information of the various OAM cells to report the line state, board mounting state, loopback control state, alarm status of each ADSL subscriber to the upper processor board through the IPC unit ADSL matching device in a multiplexing system. The method of claim 1, The ATM layer processing unit monitors a cell received from the cell multiplexing / demultiplexing unit through a UPC, adds routing information or header conversion / extraction, and VPI / VCI address conversion to a cell that does not violate a traffic contract. A receiving ATM layer processing unit for applying to the cell bus matching unit; Transmitting ATM layer processing unit which analyzes the cell received from the cell bus matching unit to determine whether it is VPC or VCC, and checks the corresponding ADSL subscriber using the VPI / VCI address translator to apply to the cell multiplexer / demultiplexer. AD subscriber registration device in the AT multiplexing system comprising a. The method of claim 1, The OAM processing unit analyzes the OAM information of the ATM cell received from the ATM physical layer processing unit or the ATM network, performs cell counting and operation monitoring function through the transmitting cell FIFO unit, and reports it to an upper processor, and an error of the OAM cell processing function. A DSL subscriber registration device in an ATM multiplexing system, which processes management, operation management, activation and deactivation, resource management functions, and alarm functions. The method of claim 1, The cell bus matching unit formats a cell received through the cell inlet from the receiving ATM layer processing unit to match a cell bus type using the VPI / VCI address conversion unit and stores the cell in the inlet queue, and then controls the cell bus under the control of a bus arbiter. Is transmitted to the ATM network side through the cell bus logic interface, and the cell address screen is performed on the cell received from the ATM network side through the cell bus logic interface, the routing index is extracted, and the routing tagged cells are placed in the outlet queue. And a subscriber station matching device in an ATM multiplexing system, characterized in that stored and transmitted in synchronization with a cell outlet.