KR0153922B1 - Atm interfacing apparatus for supplying the mpeg signal - Google Patents

Abstract

The present invention provides a personal computer having an MPEG-2 card that compresses a complex multimedia service consisting of video signals, audio signals, and text into a signal of up to 15M, to be used as a terminal of a broadband integrated information network by connecting an ATM network. To this end, it is an object of the present invention to provide an ATM matching device having a matching function of a coder / decoder card and an access function to an ATM network.

The present invention enables a video retrieval service to be immediately supported for a PC having a current MPEG-1 decoder, and the present configuration is maintained even when the PC has an MPEG-2 coder / decoder. It is possible to provide interactive video services such as video conferencing without modification. In addition, the present invention has the advantage of being able to accommodate the services by the PVC (permanent virtual path) because it expands one functional slot of the PC without purchasing an expensive matching device to the terminal of the B-ISDN.

Description

ATM Matching Device for Accepting MPEG Signals

1 is an overall functional configuration diagram of an ATM matching device.

2 is a block diagram of a physical medium matching unit.

3 is a configuration diagram of a physical layer processing unit.

4 is a block diagram of an ATM layer processing unit.

5 is a configuration diagram of the hierarchy management unit.

6 is a schematic diagram of an ATM adaptation layer (AAL) transmitter.

7 is a schematic diagram of an ATM adaptation layer (AAL) receiver.

8 is an application layer connection configuration diagram.

* Explanation of symbols for main parts of the drawings

1: Physical medium matching unit 2: Physical layer processing unit

3: ATM layer processing unit 4: layer management unit

5: adaptation layer unit 6: application layer connection unit

The present invention is an ATM matching device configured to connect a personal terminal having an MPEG-2 card to an ATM network for a multimedia application.

The standardization of broadband integrated telecommunication networks is actively progressing and a new data transfer method called Asynchronous Transfer Mode (ATM) is applied to successfully build it. This is a fixed packet (ATM cell) with a limited data length (53 bytes) in order to compensate for the disadvantage of using the variable length packet used in the existing data network and to compensate for the disadvantage of bandwidth inefficient use of the conventional synchronous multiplexing transmission method. ) And hierarchical concept is applied for each protocol processing. In addition, it was determined that the implementation of the broadband integrated telecommunication network could provide various services to users using one link with high quality, enable systematic and rapid maintenance, and lead to the development of various related industries.

For this reason, ATM switches, network termination devices, and broadband terminal matchers are appearing one after another as the broadband integrated telecommunication network business started in early 1990. The International Telecommunication Advisory Committee Communications Division (ITU-T) provides broadcasting services of LAN-BTA (Internet Broadband Terminal Matching Unit), Ethernet-BTA, and NTSC that connect local area networks that are currently mixed in business buildings to such broadband networks. These include the video-BTA for accessing the ATM network using the protocol corresponding to the ATM adaptation layer type 1 of the ATM-related standard, and the ISDN-BTA for accessing the narrowband integrated information communication network service to the ATM network.

However, they have many problems to accommodate multimedia services. In particular, products considering the quality of services and multimedia services that are currently widely available have not yet come out and are currently being developed in many places. In the case of Video-BTA, which provides video and audio signals, a 45M-class compressed signal source is passed through AAL-1, ATM, and physical layer protocols that process a fixed bit rate. Connected.

The problem is that the processing in the ATM adaptation layer is complicated, there is a problem due to the restoration of the source clock, and the bandwidth for providing a video signal and an audio signal is wide. To compensate for these issues, it is inevitable to accept MPEG-1 or MPEG-2, which is a compression method currently used to contain data on compact discs (CDs). In the case of using such a compression scheme, the bandwidth required for transmitting these signals can be up to about 15Mbps. Many coder / decoder cards of personal computers that provide such compression schemes have been released, and the above-described coder / decoder cards have a connection function of a broadband integrated information network that enables a personal computer to be used as a Miltimedia terminal using such an application card. In line with this, there is a need to develop an ATM matching device for providing multimedia services to personal computers.

The ATM matching card supports the MPEG coder / decoder card matching function and the ATM network access function. The ATM adaptation layer's processing protocol uses type 5, which is simple to implement and has a function for verifying data loss.

Therefore, the present invention can be used as a terminal of a broadband integrated information network by connecting a personal computer having an MPEG-2 card that compresses a complex multimedia service consisting of video signals, audio signals, and text into a signal of up to 15M. The purpose of the present invention is to provide an ATM matching device having a matching function of such a coder / decoder card and an access function to an ATM network.

In order to achieve the above object, the present invention supports physical / electrical connection standards for connecting to a network, but requires line coding, clock regeneration, clock multiplication, and the like depending on the type of physical medium used for connection with a terminal in a network. A physical medium matching unit performing a function including serial / parallel conversion of data, and a physical layer processing unit performing a function including transmission frame processing, cell matching, service cell mapping and extraction by receiving the output of the physical medium matching unit. And a receiving unit and a transmitting unit, wherein the receiving unit reads the cell data inputted into the receiving unit buffer of the physical layer processing unit, compares the connection identifiers, and separates and transmits the signal and the OAM cell and the service cells according to the result. Multiplexed cells and layer-managed signals and OAM cells, and multiplexed according to the state of the buffer of the transmitter of the physical layer processor ATM adaptation that connects to ATM layer processing unit that provides stream and ATM layer processing unit in payload data unit (PDU) of 48 bytes and makes connection with upper layer through division and recombination sublayer function and common part convergence sublayer function. Provides access methods related to the multimedia environment of the hierarchical part and personal computer in the form of connection including Industry Standard Architecture (ISA), Extended Industry Standard Architrture (EISA), Peripheral Component Interconnector (PCI), and Small Computer System Interface (SCSI). Application layer connection unit, connected to each functional unit, OAM function such as failure management / performance management of physical layer and ATM layer, signal AAL function for signal cell generation, system management function for system startup and status monitoring It comprises a layer management unit for performing.

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

1 is a full functional configuration of the ATM matching device of the present invention, the physical medium matching unit 1, physical layer processing unit 2, ATM layer processing unit 3, layer management unit 4, ATM adaptation layer unit 5, application It is characterized by including the layer connection part 6.

It performs service adaptation for ATM protocol processing of service data provided by higher application layer and provides network access that enables communication with corresponding multimedia server or other multimedia terminal using ATM network.

The physical medium matching unit 1 is a functional unit that supports physical / electrical connection standards for connecting to a network, and requires line coding, clock regeneration, clock multiplication, and data depending on the type of physical medium used for connection with a terminal in a network. It is characterized by performing a function such as serial / parallel conversion.

The physical layer processing unit 2 is a functional unit that performs the physical layer functions mentioned in ITU-T Recommendations I.432, I.610, and G.78x, and performs functions such as transmission frame processing, cell matching, service cell mapping, and extraction. It is characterized by performing.

In the ATM layer processing section 3, the reception section reads the cell data input to the reception buffer of the physical layer processing section and compares the connection identifiers. According to the result, the signal and the OAM cell are the layer management section 4, and the service cells are ATM adaptive. The function of transmitting the cell to the layer unit 5 and the transmitter unit multiplexes the service cell provided by the ATM adaptation layer unit 5 and the signal and OAM cells generated by the layer manager 4 and multiplexes the transmitter of the physical layer processor 2. According to the state of the buffer characterized in that to provide a multiplexed cell stream.

The layer manager 4 performs OAM functions such as fault management / performance management of physical layer and ATM layer, signal AAL function for signal cell generation, and system management function for system startup and status monitoring. It is done.

The ATM adaptation layer 5 is connected to the ATM layer processing unit 4 by a 48-byte payload data unit (PDU), and the upper application layer connection unit 6 is provided through a partition and recombination sublayer function and a common partial convergence sublayer function. It is characterized by making the connection with).

The application layer connection unit 6 provides an access method related to a multimedia environment of a personal computer, and includes an Industry Standard Architrture (ISA), an Extended Industry Standard Architrture (EISA), a Peripheral Component Interconnector (PCI), and a Small Computer System Interface (SCSI). It may have a connection form such as. The following describes a method of transferring service data that can be used on any bus connection without being limited to a specific bus connection to them.

2 is a configuration diagram of a physical medium matching unit (1 in FIG. 1), and includes an optical / electric conversion unit 101, a clock extraction / data retiming unit 102, and a serial / parallel conversion unit 103. It features. This converts an optical signal having a frequency of 155.520 MHz and a wavelength of 1310 nm into an electrical parallel signal to provide the physical layer processor 2.

The optical / electric converter 101 converts the optical signal received from the optical line into an electrical signal and provides it to the clock extraction / data retiming unit 102 and the serial electrical signal provided by the serial / parallel converter 103. Converts the signal into an optical signal and provides it to the network through the optical line and provides the layer manager 4 with the loss of the optical signal according to the sensitivity of the received optical signal.

The clock extraction / data retiming unit 102 extracts timing information from the 155.520 Mbps electrical signal provided by the opto-electric conversion unit 101 and retimes the data using the clock to provide the serial / parallel conversion unit 103. Done.

The serial / parallel conversion unit 103 extracts the byte boundary from the recovery clock and the 155.520 Mbps data provided by the clock extraction / data retiming unit 102, converts the byte boundary into byte data, and provides it to the physical layer processing unit 2. It receives a byte data, a clock, and a control signal provided by the layer processing unit 2 and converts it into serial data of 155.520 Mbps to perform the function provided to the optical / pre-conversion unit 101.

3 is a block diagram of the physical layer processing unit (2 in FIG. 1). The frame synchronization unit 201, the descrambling unit 202, the scrambling unit 203, the SOH processing unit 204, the pointer processing unit 205, and the POH processing unit ( 206, cell boundary recognition unit 207, cell payload scrambling unit 208, cell payload descrambling unit 209, HEC generation unit 210, cell rate matching unit 211, and ATM access buffers. It is characterized by having a portion (212).

The frame synchronizer 201 extracts an STM-1 frame from the byte data received by the physical medium matcher 1, which detects a fixed data pattern of A1 and A2 bytes to detect a frame boundary and a frame synchronization clock. Extracts (8KHz) and provides the descrambling unit 203 and the frame synchronization state information to the layer manager 4.

The descrambling unit 202 detects the B1 error prior to descrambling and provides the section data header (SOH) processing unit 204 with the decoded byte data for all frame data except the first 9 bytes of the STM-1 frame. It performs the function.

The scrambling unit 203 is a transmitter function of the physical layer processing unit and performs a scrambling function in parallel with all frame data except for the first 9 bytes of the STM-1 frame provided by the section header header processing unit 204 at a speed of 19.44NHz. To the physical medium matching unit 1. In the transmitter, the SOH processor 204 adds information corresponding to the multiplexed section overheader and the playback section overheader to the AU-4 frame provided by the pointer processor 205 to form a complete STM-1 frame, so that the scrambling unit 203 The receiver performs a function of providing an STM-1 framed byte signal, and the receiver extracts the reproduction section overheader and the multisection overheader bytes from the descrambled STM-1 signal and converts the AU-4 frame signal into a pointer processor 205. And to provide the layer management unit 4 with information corresponding to each header. At this time, the playback section overhead header is A1, A2 byte used for frame synchronization, C1 byte used as STM-1 identifier, B1 byte used for relay section performance monitoring, and E1 byte provided to the operator section of the relay section. It consists of F1 byte provided as user channel and D1, D2, D3 byte provided as data communication channel for relay section for STM-1 OAM.

The multiplexed section overhead byte is a B2 byte for monitoring transmission STM-1 multisection performance, K1, K2 byte supporting automatic transition switching (APS), and 596Mbps data communication channel for STM-1 OAM. Operators of D4 to D14 bytes, S1 byte for channel for network synchronous message transmission, Z1 byte for 128 Kbps serial external interface, Z1 byte for notifying multi-zone failure to large station, and 64 Kbps for multi-zone It consists of E2 bytes to provide a voice channel. The pointer processing unit 205 is a pointer byte (H1, H2) indicating a starting point of the VC-4 in the STM-1 payload in order to map the transmission VC-4 signal provided from the POH processing unit 206 to the STM-1 frame. ) To perform the function of providing to the SOH processing unit 204 in the form of an AU-4 frame, and the receiving unit analyzes the pointer byte (H1, H2) from the AU-4 signal provided by the SOH processing unit 204 to receive STM Extracts the VC-4 start point within the -1 frame and provides the corresponding VC-4 signal to the POH processing unit 206. The path header (POH) processing unit 206 processes and inserts header information for OAM on the transmission VC-4 signal path into the C4 signal provided by the cell payload scrambling unit 208, thereby transmitting the VC-4 signal. And the POH carrying the OAM information on the path from the received VC-4 signal provided by the pointer processing unit 206 to perform the function of providing the same to the pointer processing unit 206. The C4 signal provided to the layer manager 4 and the remaining C4 signal are provided to the cell boundary recognizer 207. At this time, the path header byte is J1 byte for VC-4 signal path tracking, B3 byte for error performance monitoring on VC-4 path, C2 byte as an acknowledgment identifier of ATM cell in C4 path, path OAM to be transmitted to large station. G1 byte indicating information (P-RDI, P-PEI), H4 byte indicating ATM cell start point in VC-4 payload, F2 byte for supporting 64Kbps channel for external serial user communication on VC-4 path, and It consists of Z3 to Z5 bytes for an external serial reservation interface of 192 Kbps.

The cell boundary recognition unit 207 receives the C4 signal provided by the POH processing unit 206, extracts the cell boundary by the cell boundary extraction algorithm, and provides an 53-byte ATM cell to the cell payload descrambling unit 209. And provide state information (OCD, LCD, etc.) on the cell boundary extraction algorithm to the layer manager 4.

The cell payload scrambling unit 208 receives 53 bytes of ATM cell data provided by the HEC generation unit, and stores 48 bytes of payload except for 5 bytes of headers in units of bytes using a self-synchronizing generation polynomial (X ⁴³ +1). It performs the function of mixing and providing to the POH processing unit 206 in the form of C4 signal.

The cell payload descrambling unit 209 demixes the 48-byte payload information from the 53-byte cell data provided by the cell boundary recognition unit 207 in units of bytes by using the self-synchronizing generation polynomial (X ⁴³ +1). Afterwards, the cell rate matching unit 211 is provided with 53 bytes of ATM cell data.

The HEC generation unit 210 generates a CRC for the first 4 bytes of the cell header with respect to the ATM cell data provided by the cell rate matching unit 211, and inserts the CRC into the 5th byte of the cell header to scramble the cell payload 208. Perform the functions provided by. In this case, the generation polynomial of the HEC generation unit is X ⁸ + X ² + X + 1.

The cell rate matching unit 211 generates an idle cell when there is no service cell delivered from the ATM layer in order to perform a matching function between the cell rate delivered from the ATM layer and the cell transfer rate on the SDH transmission path. If there is, the cell payload descrambling unit 208 performs the function of matching the cell rate so that the cell payload scrambling unit 208 can generate the C4 signal, and the receiver unit provides the cell payload descrambling unit 209. It recognizes an idle cell among 53-byte ATM cells, removes it, and provides only the pure serving cell to the ATM layer processor 3.

The ATM access buffer unit 212 performs a cell buffering function and a control signal generation function for the connection between the physical layer processing unit 2 and the ATM layer processing unit 3. The receiver buffer is a portion where the cell flows from the physical layer processor 2 to the ATM layer processor 3, which provides only information on the presence or absence of cells in the buffer at the physical layer, and reads it from the ATM layer processor 3. It generates control signals and the transmitter buffer provides the opposite cell flow. In the physical layer, only cell receivable information in the buffer is provided to the ATM layer processor 3, and all control signals related to the writing are generated in the ATM layer. It is performed by the processing unit 3.

4 is a configuration diagram of an ATM layer processor (3 in FIG. 1), which includes a transmitter cell buffer 301, a transmit / receive cell controller 302, a receiver cell buffer 303, a connection manager 304, and a cell multiplexer 305. ), A cell demultiplexer 306, an OAM cell buffer 307, a signal cell buffer 308, and a cell header processor 309.

The transmitter cell buffer 301 is a state of a transmission buffer provided by the ATM access buffer unit 212 of the physical layer processor 2 of the service cell data provided to the physical layer processor 2 provided by the cell multiplexer 305. As a temporary cell buffer function for flow control according to information, a function of providing 53 bytes of cell data to the physical layer processor 2 under the control of the transmit / receive cell controller 302 is performed.

The transmit / receive cell control unit 302 according to the control information and system management information provided by the layer management unit 4 and the state information of the transmit / receive buffer provided by the ATM connection buffer unit 212 of the physical layer processing unit 2. A control signal is generated for the transmitter cell buffer 301 and the receiver cell buffer 303, and a read / write control signal for the ATM connection buffer 212 of the physical layer processor 2 is generated. The cell multiplexer 305 also generates a control signal.

The receiver cell buffer 303 compares the connection related information included in the 5-byte header of the 53-byte cell data read from the physical layer processing unit 2, and determines a valid / invalid cell. Generates demultiplexing control information divided into cells and signal cells, provides them to the cell demultiplexing unit 306, and reads and discards invalid cells.

The cell multiplexer 305 multiplexes the OAM cell, the signal cell provided by the layer manager 4 and the service cell data provided by the ATM adaptation layer 5. The cell demultiplexer 306 provides a function of determining the path of the current cell according to the demultiplexing control information provided by the connection manager 304.

The OAM cell buffer 307 receives the transmission OAM cell information provided from the layer management unit 4 and temporarily stores the OAM cell information until the cell multiplexer 305 provides the transmission order, and the cell demultiplexer 306 A function of storing the provided OAM cell data until it is read by a processor in charge of the layer manager 4.

The cell header processing unit 309 removes the 5-byte cell header from the 53-byte cell data received by the cell demultiplexing unit 306 to access the ATM layer processing unit 3 and the ATM adaptation layer unit 5. By providing SAR-PDU data in the form of byte and its inverse function, it performs a function of multiplexing 5 bytes of cell header including connection recognition information with 48 bytes of SAR-PDU provided by ATM adaptation layer (5). The cell multiplexer 305 provides a 53-byte ATM cell data.

5 is a block diagram of the layer manager 4, which includes a state monitoring unit 401, a signal cell processing unit 402, an OAM cell processing unit 403, and a system control / management unit 404.

The layer manager 4 is composed of software on a processor and hardware for supporting the same. The function of the state monitoring unit 401 is optical signal loss information of the physical medium matching unit 1, frame synchronization information of the physical layer processing unit 2, pointer analysis information, cell boundary recognition information, error information of each level, ATM The system control / management unit collects various state information of the ATM adaptation layer unit 5 and various state information of the application layer connection unit 6, such as state information of each buffer of the layer processing unit 3, coefficient bosses of invalid cell information, and the like. Perform the function provided by 404.

The function of the signal cell processing unit 402 receives a signal cell provided by the ATM layer processing unit 3 and performs signal AAL processing thereof, and provides the resulting signal information to the system control / management unit 40 and the system control / management unit 404. Receives the signal information to be generated in the) performs the signal AAL process and provides a 53-byte ATM cell form to the ATM layer processing unit (3).

The OAM cell processing unit 403 receives the OAM cell provided by the ATM layer processing unit 3, collects OAM related data, provides the OAM cell to the system control / management unit 404, and the state information of each layer in the system control / management unit 404. And generates an OAM cell to be generated according to the needs of the operator and provides the ATM layer processing unit 3 in the form of an 53-byte ATM cell.

The system control / management unit 404 collects performance information and state information provided by the physical layer processing unit 2 and the ATM layer processing unit 3, generates each layer control signal and management information, generates and processes signal information, OAM generation and processing of physical layer and ATM layer, function of providing connection management data of transmitting / receiving cell, collection of state information and control signal generation of ATM adaptation layer 5 and application layer connection 6, application layer and The function of generating an interface signal for the connection of.

6 is a block diagram of an ATM adaptation layer (AAL) transmitter, which includes a CRC generator 501, a trailer generator 502, a multiplexer 503, a SAR buffer unit 504, a PDU divider 505, and an AAL controller. 506 is provided.

It is a functional block for adapting application service data information to ATM protocol and implements ATM adaptation layer with AAL type 5. The video codec card, which is an application layer, transmits a data packet having a specific length and inserts the length information and other forward error control information of the received data packet and provides it in units of ATM-SDUs.

The CRC generation unit 501 receives the service data packet received at the application layer through the application layer connection unit 6 to provide forward error control for the service data data (376 byte units) of the upper layer of the ATM. Calculates a cyclic redundancy check (CRC-32) and provides this value to the trailer generator 502.

The trailer generator 502 generates 8-byte trailer data including the CRC-32 information provided by the CRC generator 501 and the payload length information of the CPCS-PDU provided by the AAL controller 506. Performs a function provided by the multi-part 503.

CPCS-PDU data is formed by multiplexing the 376-byte CPCS-PDU payload data read from the application unit connection unit 6 and the 8-byte trailer information provided by the trailer generator 502. It performs the function of providing to the SAR buffer unit 504. The SAR buffer unit 504 performs a buffering function for transmitting CPCS-PSU data provided from the multi-unit 503 to the ATM layer in units of ATM-SDUs under the control of the PDU divider 505.

The PDU splitter 505 divides 384 bytes of CPCS-PDU data into 48 bits of SAR-PDU or ATM-SDU to provide the SAR buffer unit 504 in the multiplexer 503. It generates a signal to control the output of the SAR buffer unit 504 to provide a to perform the segmentation function of the AAL-5.

The AAL control unit 506 receives a control signal and a management signal provided by the layer manager 4 and performs a function of generating a control signal of each functional unit related thereto.

7 is a block diagram of an ATM adaptation layer (AAL) receiving unit. The ATM-SDU buffer unit 507, the CPCS-PDU boundary recognition unit 508, the CRC verification unit 509, the recombination unit 510, and the SAR control unit 511 are illustrated. And a CPCS-SDU start address queue 512.

The ATM-SDU buffer unit 507 performs CPCS-PDU boundary recognition and forward error detection on the 48-byte cell payload information provided by the ATM layer processor 3 until it obtains information for recombination of the CPCS-PDUs. And buffers and provides these data to the recombination unit 510 by a buffer output control signal by the SAR control unit 511.

The CPCS-PDU boundary recognition unit 508 recognizes the length field in the 48-byte cell payload information provided by the ATM layer processing unit 3, EOM information obtained from the payload type of the ATM Hell header, and the CRC verification unit 509. Recognizes the boundary of the CPCS-PDU data by the CRC verification signal provided by the) and provides the related CPCS-PDU information to the SAR control unit 511.

The CRC verification unit 509 verifies the CRC-32 coding generated by the transmitter to determine whether there is a forward error on the path, and provides the information to the CPCS-PDU boundary recognition unit 508 and the layer manager 4. .

The recombination unit 510 is composed of RAM and functions to be stored in one CPCS-PDU payload data unit in the ATM-SUD buffer unit 507 under the control of the SAR controller 511 to be read by the application service layer. Do this. The SAR control unit 511 is a control signal for storing in the recombination unit 510 in one CPCS-PDU payload data unit based on the CPCS-PDU information provided by the CPCS-PDU boundary recognition unit 508 and the recombination unit. A start address of each CPCS-PDU payload data stored in the 510 is generated and stored in the CPCS-PDU start address queue 512. In addition, the CPCS-SDU start address queue 512 performs a function of providing information on a read start address in order for the service application layer to read the RAM of the recombination unit 510. This is because the layer management unit 4 generates an interrupt signal when there is application service data to be provided from the ATM adaptation layer (AAL) to the service application layer, and the service application layer is a RAM which is a recombination unit 510 of the ATM adaptation layer (AAL). The CPCS-SDU start address queue 512 is read first to read RAM, and RAM is read based on this start address to receive application service data.

8 is a configuration diagram of the application layer connection unit 6, and includes an interrupt status register 601, a status register 602, a control register 603, an address translation / control unit 604, and a bus driver 605. It is done.

The interrupt status register 6010 generates an interrupt in the layer manager 4 when an application service data to be provided to the application service layer occurs and an event requiring display for system management in each layer. Provides interrupt-related status information to distinguish the processor.

The status register 602 stores the state information of each layer so that the host can access the minor performance information and the state information of each layer. The control register 603 provides a function of receiving connection management information by the host and control information of each layer and storing the information so that the layer management unit 4 can control it.

The address translation / control unit 604 converts the address information of each device in the ATM matching card generated by the host into in-board control information related thereto and provides a function. The bus driver 605 has a function of physically supporting a connection with a higher application layer and enabling bus sharing with various function slots in the PC, which is based on the PCI, ISA, SCSI, and EISA depending on the expansion slot in the PC. It performs the function of supporting the connection standard.

Accordingly, the present invention configured and operated as described above enables a video retrieval service to be immediately supported for a PC having a current MPEG-1 decoder, and the PC can provide an MPEG-2 coder / decoder. Even if it has, it is possible to provide an interactive video service such as video conferencing without modifying the current configuration. In addition, the present invention has the advantage of being able to accommodate the above services by PVC (Permanent Virtual Path) because it expands one function slot of the PC without purchasing an expensive matching device to the terminal of the B-ISDN.

Claims (8)

Supports physical / electrical connection standard for connecting with network, but includes line coding, clock regeneration, clock multiplication, and serial / parallel conversion of data according to the type of physical media used for connection with terminal in network. A physical layer matching unit 1 that performs a physical layer matching unit 1 and a physical layer processing unit 2 that performs a function including transmission frame processing, cell matching, service cell mapping and extraction by receiving the output of the physical medium matching unit 1 And a receiving unit and a transmitting unit, wherein the receiving unit reads the cell data inputted into the receiving unit buffer of the physical layer processing unit 2, compares the connection identifiers, and separates and transmits the signal and the OAM cell and the service cells according to the result. The ATM layer multiplexes the service cell, the layer management signal, and the OAM cells to provide the multiplexed cell stream according to the state of the transmitter buffer of the physical layer processor 2. ATM adaptation layer unit which connects to the processing unit 3 and the ATM layer processing unit 3 in a 48-byte payload data unit (PDU) and establishes a connection with an upper layer through the division and recombination sublayer function and the common part convergence sublayer function. (5) Provides access methods related to the multimedia environment of personal computers in connection forms including Industry Standard Architrture (ISA), Extended Industry Standard Architrture (EISA), Peripheral Component Interconnector (PCI), and Small Computer System Interface (SCSI). Connected to the application layer connection unit 6 and each of the functional units 1, 2, 3, 5, and 6 for signal generation of OAM functions and signal cells, such as fault management / performance management of the physical layer and the ATM layer. An ATM matching device for accommodating MPEG signals, comprising a layer management unit (4) for performing an AAL function, a system management function for starting a system and monitoring a state. The method of claim 1, wherein the physical medium matching unit 1 converts and provides an optical signal received from an optical line into an electrical signal, and converts a serial electrical signal from the physical layer processing unit 2 into an optical signal. The optical / electric conversion unit 101 and the optical / electric conversion unit 101 provide the network through the optical line and provide the layer management unit 4 with a loss thereof according to the sensitivity of the received optical signal. A clock extraction / data retiming unit 102 for extracting timing information from the 155.520 Mbps electrical signal and retiming the data with the clock, and a recovery clock provided to the clock extraction / data retiming unit 102. It extracts byte boundary from 155.520Mbps data, converts it into byte data, provides it to the physical layer processor 2, receives the byte data, clock, and control signal provided from the physical layer processor 2. It is converted into serial data of 155.520Mbps ATM matching unit for receiving the MPEG signal comprising the S / P conversion unit 103 provided in the optical / electrical converting portion 101. The The method of claim 2, wherein the physical layer processing unit 2 performs a function of extracting an STM-1 frame from the byte data received by the physical medium matching unit 1, and detects fixed data patterns of A1 and A2 bytes. The frame synchronizer 201 and the frame synchronizer 201 to provide the frame synchronization state information to the layer manager 4 and receive the output of the frame synchronizer 201. The descrambling unit 202 which detects the B1 error before scrambling and provides the descrambled byte data for all frame data except the first 9 bytes of the STM-1 frame, except the first 9 bytes of the STM, -1 frame. The scrambling unit 203, which performs a scrambling function in parallel to all the frame data at a speed of 19.44NHz, and provides it to the physical medium matching unit 1, in the transmitting unit The information corresponding to the multiplexed section overheader and the playback section overheader is added to the AU-4 frame to form a complete STM-1 frame to provide the STM-1 framed byte signal to the scrambling unit 203, and the descrambler SOH extracting the reproduction section overheader and the multi-section overheader bytes from the received STM-1 signal to provide an AU-4 frame signal and to provide the layer manager 4 with information corresponding to each header. In order to map the transmission VC-4 signal to the STM-1 frame, the processing unit 204 generates a pointer byte (H1, H2) indicating the starting point of the VC-4 in the STM-1 payload, thereby generating the AU-4 frame. Form to the SOH processor 204, and the receiver analyzes the pointer bytes H1 and H2 from the AU-4 signal provided by the SOH processor 204 to extract the VC-4 starting point in the received STM-1 frame. Ha The pointer processing unit 205 for outputting the VC-4 signal and the transmitting unit process and insert the header information for the OAM on the transmission VC-4 signal path into the C4 signal provided by the cell payload scrambling unit 208 to insert the VC- signal. Four signals are formed and provided to the pointer processing unit 206, and the receiving unit extracts and analyzes the POH carrying OAM information on the path from the received VC-4 signal provided from the pointer processing unit 206, and provides related management information to the layer management unit ( 4) a path overhead header (POH) processing unit 206 for outputting the remaining C4 signal and a C4 signal provided by the POH processing unit 206, and extracting a cell boundary by a cell boundary extraction algorithm. Cell boundary recognition unit 207 for outputting ATM cells of the cell and providing state information (OCD, LCD, etc.) on the cell boundary extraction algorithm to the layer management unit 4, receiving 53 bytes of ATM cell data, and receiving 5 byte headers. Article The cell payload scrambling unit 208 and the cell boundary recognition unit are configured to mix the 48-byte payload with the POH processor 206 in the form of a C4 signal by using a self-synchronized generation polynomial (X ⁴³ +1). Cell payload descrambling of 48-byte payload information from the 53-byte cell data provided to 207) by using a self-synchronized generation polynomial (X ⁴³ +1) to de-byte the data, and outputting 53-byte ATM cell data. A HEC generator 210 and a transmitter for generating a CRC for the first 4 bytes of the cell header for ATM cell data, inserting the CRC into the 5th byte of the cell header, and providing the cell payload scrambling unit 208 to the cell payload scrambling unit 208. In operation C4, the cell payload scrambling unit 208 performs a function of generating an idle cell when there is no service cell delivered from the ATM layer and stopping the occurrence of the service cell. The cell rate is matched to generate a call, and the receiving unit recognizes and removes an idle cell among 53-byte ATM cells provided by the cell payload descrambling unit 209, and removes only the pure service cell from the ATM layer processing unit 3 The cell speed matching unit 211 and the cell speed matching unit 211 are connected to perform a cell buffering function and a control signal generation function for the connection between the physical layer processing unit 2 and the ATM layer processing unit 3. And an ATM access buffer unit (212). 4. The ATM layer processing unit (3) according to claim 3, wherein the ATM layer processing unit (3) is configured to provide control information and system management information provided by the layer management unit (4) and transmission / reception provided by the ATM connection buffer unit (212) of the physical layer processing unit (2). A transmit / receive cell control unit 302 which generates a buffer control signal according to the state information of the buffer and generates a read / write control signal to the physical layer processing unit 2, and physical control according to the control of the transmit / receive cell control unit 302. The transmitter cell buffer 301 which provides 53 bytes of cell data to the layer processor 2 and the connection related information contained in the header of 5 bytes of 53 bytes of cell data read from the physical layer processor 2 are valid. In the case of determining an invalid cell and valid cell, the receiver cell buffer 303 and the layer manager 4 which generate demultiplexing control information divided into a serving cell, an OAM cell, and a signal cell, read out and discard the invalid cell. OAM cell, signal cell and TM product In the cell multiplexer 305 for multiplexing the service cell data provided by the layer unit 5, the cell demultiplexer 306 and the layer manager 4 that determine the path of the current cell according to the demultiplexing control information. OAM cell buffer for temporarily receiving OAM cell data provided by the cell demultiplexer 306 and temporarily storing the received OAM cell information until the cell multiplexer 305 provides the transmission order. 307 and 53 bytes of cell data received from the cell demultiplexer 306 to remove 48 bytes of cell headers to provide 48 bytes of data, and ATM adapts the 5 bytes of cell headers including connection recognition information. And a cell header processing unit 309 which is multiplexed with the SAR-PDU provided by the layer unit 5 and provided to the cell multiplexer 305 in the form of 53-byte ATM cell data. ATM matching cabinet Chi. The method according to claim 4, wherein the optical signal loss information of the physical medium matching unit 1, frame synchronization information of the physical layer processing unit 2, pointer analysis information, cell boundary recognition information, error information of each level, ATM layer processing unit ( A state monitoring unit 401 for collecting and providing state information of each buffer of 3), count information of invalid cell information, various state information of the ATM adaptation layer unit 5, and various state information of the application layer connection unit 6, A signal cell processing unit 402 which receives a signal cell provided by the ATM layer processing unit 3, performs signal AAL processing thereof, provides the resulting signal information, and provides the ATM layer processing unit 3 in the form of a 53-byte ATM cell. In addition, the OAM cell provided by the ATM layer processor 3 collects and provides OAM-related data, generates OAM cells to be generated according to the state information of each layer and the needs of the operator, and forms an ATM cell of 53 bytes. ATM layer processing The physical layer processor 2 and the ATM layer processor 3 are connected to the OAM cell processor 403, the state monitoring unit 401, the signal cell processor 402, and the OAM cell processor 403. Collects performance information and status information provided by the system, generates control signals and management information of each layer, generates and processes signal information, OAM generation and processing of physical layer and ATM layer, and provides connection management data of transmitting and receiving cells. And a system control / management unit 404 for performing function of collecting state information and generating control signals of the ATM adaptation layer unit 5 and the application layer connection unit 6, and generating an interface signal for connection to the application layer. ATM matching device for accommodating MPEG signals, characterized in that. The method according to claim 5, wherein the ATM adaptation layer transmitter receives a service data packet through the application layer access unit 6, calculates a CRC-32 (Cyclic Redundancy Check) in bytes, and outputs a CRC generation unit ( 501), a trailer generator 502 for generating and providing 8-byte trailer data including CRC-32 information provided by the CRC generator 501 and payload length information of a CPCS-PDU, and an application layer A multiplexer 503 which forms and provides CPCS-PDU data by multiplexing the 376-byte CPCS-PDU payload data read from the connector 6 and the 8-byte trailer information provided by the trailer generator 502. A SAR buffer unit 504 for buffering CPCS-PDU data provided by the multiplexer 503, and 384 bytes of CPCS-PDU data for providing the SAR buffer unit 504 to the multipart 503 by 48 bytes ATM layer by dividing into units of SAR-PDU or ATM-SDU A PDU divider 505 for generating a signal for controlling the output of the SAR buffer unit 504 to be provided to the processor 3, and a control signal and a management signal provided by the layer manager 4 to receive the CRC generator; 501, a trailer generator 502, a multiplexer 503, and a PDU splitter 505 for generating control signals of the PDU splitter 505; Matching device. 7. The ATM-A receiver according to claim 6, wherein the receiving unit of the ATM adaptation layer (AAL) buffers 48-byte cell payload information provided by the ATM layer processing unit 3 and provides these data by a buffer output control signal. CPCS-PDU boundary recognizing unit 508 for receiving CPCS-PDU information by receiving 48-byte cell payload information provided by SDU buffer unit 507 and ATM layer processing unit 3, and CRC-32 coding generated by the transmitting unit The CRC verification unit 509 and the ATM-SDU buffer unit 507 provide the information to the CPCS-PDU boundary recognition unit 508 and the layer manager 4 to determine whether there is a forward error on the path. A recombination unit 510 for storing CPCS-PDU payload data to be read by an application service layer and one CPCS-PDU based on CPCS-PDU information provided by the CPCS-PDU boundary recognition unit 508. Control to store in the recombination unit 510 in units of payload data SAR control unit 511 for generating and outputting the call and the start address of each CPCS-PDU payload data stored in the recombination unit 510, and the service application layer for the read start address to read the recombination unit 510. And a CPCS-SDU start address queue (512) for performing information providing functions. 8. The application layer connection unit (6) according to claim 7, wherein the application layer connection unit (6) includes an interrupt status register (601) for providing interrupt-related state information for distinguishing interrupts from the layer management unit (4) in the host processor. The layer management unit 4 receives the status register 602 which stores the state information of each layer so that the minor performance information and the state information can be accessed, the connection management information by the host, and the control information of each layer. A control register 603 for storing the information so as to convert the address information of each device in the ATM matching card generated by the host into the control information to control the interrupt status register 601, the status register 602, and the control. Address translation / control unit 604 provided in register 603, and a server with various functional slots in the PC to physically support access to higher application layers. To be shared, and in accordance with the expansion slot in a PC that is applied over ATM matching unit for receiving the MPEG signal comprising the bus driver (605) supporting a connection standard such as PCI, ISA, SCSI, EISA.