KR0131851B1 - Cell transceiver apparatus for atm of single ring structure - Google Patents

Abstract

According to the present invention, an ATM cell sent from a transmitting node is received through a ring and converted into received data, and a cell and a bypass cell transmitted to its own node through a comparison of a reception node identifier of the first octet of the ATM cell with a set node identification number. Receiving means 12 for outputting data in the form of an ATM cell, and discarding the ATM cell if the transmit node identifier of the first octet of the ATM cell is compared with the set node identification number; Local cell input data in the form of ATM cell input from the ATM layer and bypass cell input data input from the receiving means 12 are demultiplexed into transmission data, converted into serial ring electrical signals, converted into ring transmission optical signals, and received. The present invention relates to an asynchronous transmission mode cell transceiver under a single ring structure, characterized in that it comprises a transmission means (11) for outputting to a node. The transmission frame is simplest by using a cell-based transmission method. The structure is simple and the transmission process is processed in 32-bit units, and thus, compared with the conventional technology of processing in 8-bit units, it is possible to connect more nodes on the ring by providing four times the transmission speed at the same processing speed.

Description

Asynchronous Cell Transmitter and Receiver under Single Ring Structure

1 is a block diagram illustrating an ATM cell transceiver in a single ring structure according to the present invention.

2 is a block diagram of a transmission apparatus according to the present invention.

3 is a block diagram of a receiving apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

11: transmitting device 12: receiving device

21: transmit cell queue 22: bypass cell queue

23: multiplexer 24: parallel-serial converter

25: electro-optical conversion unit 31: extraction cell queue

32: receiving cell processing unit 33: serial-parallel conversion unit

34: photoelectric conversion unit

The present invention provides an asynchronous transfer mode (ATM) for connecting nodes by a single ring according to the user-network interface standard of the broadband integrated telecommunication network recommended by the International Telecommunication Union (ITU-T). Mode hereinafter referred to as ATM) relates to a cell transceiver.

The future communication network will be developed as a broadband integrated information communication network capable of accommodating various information such as video and voice, which is being standardized by the AT M method recommended by the International Organization for Standardization. The subscriber network of the broadband integrated information communication network can be configured in such a manner that a separate cable is installed for each subscriber and a single cable is jointly used by a plurality of subscribers like a conventional telephone network. The former method is easy to implement, but requires a lot of cable, and the latter method can be more economically constructed for subscriber networks.

ATM cell transceivers of nodes connected to the conventional ring structure are transmitted in SDH (Synchronous Digital Hierarchy) frames to transmit ATM cells, which is complicated in structure and complicated in structure. There was a very slow problem.

Therefore, the present invention has been made to solve the above problems, the structure of the implementation is simple and transmit processing by transmitting and receiving ATM cells by connecting a large number of subscriber access nodes located in the user-network interface of the broadband integrated information communication network in a single ring It is an object of the present invention to provide an ATM cell transceiver capable of connecting more nodes on a ring by improving processing speed by processing in 32 bit units.

In order to achieve the above object, the present invention, after receiving an asynchronous transmission mode (ATM) cell from an external transmitting node and converting it into received data, determines the identifier of the asynchronous transmission mode (ATM) cell and transmitted to its own node. If the cell is asynchronous delivery mode (ATM) cell, the received data is stored and then transmitted to the asynchronous delivery mode (ATM) layer. If the asynchronous delivery mode (ATM) bypass cell is transmitted to the next node, the bypass cell is transmitted to the next node. Receiving means for discarding the cell; And receiving and storing an asynchronous transfer mode (ATM) cell from the asynchronous transfer mode (ATM) layer, and storing the bypass cell from the receiving means under pressure, and reading the stored cell and demultiplexing the transmission data into a transmission data. And transmitting means for converting the data into an external receiving node.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

The present invention operates in 53-octet ATM cell units for inter-node communication, and this inter-node communication function is performed at the lower ATM layer of the protocol reference model of the broadband integrated information network user-network interface. In addition, the present invention basically comprises a transmitter and a receiver, and each receiver of the transmitter is connected to one physical transmission medium to form a ring structure.

1 is an overall block diagram of an ATM cell transceiver according to the present invention.

The transmitter 11 receives the local cell write signal, local cell write clock, local cell start signal, and local cell input data transmitted from the ATM layer, while the local cell write signal is TTL (Transistor Transistor Logic) level 0. The local cell start signal synchronized with the write clock and the local cell input data in the form of 8-bit ATM cells are stored in the transmission cell queue 21 in units of 9 bits, and the detour cell write signal to the receiver 12 is stored. Bypass cell start signal synchronized with bypass cell write clock and bypass cell input signal in 8-bit ATM cell type while bypass cell write signal receives bypass cell write clock, bypass cell start signal and bypass cell input data at TTL level 0 Input data is stored in the bypass cell queue 22, and data stored in the transmit cell queue 21 and the bypass cell queue 22 are read in 53 octet units by 1: 1 hub-polling. Demultiplex to 32-bit transmit data and serial-ill After the conversion by the electrical signal converted to a serial ring electric-converted as a ring transmission optical signal by the light-conversion and transmits the ATM cell through the ring to the receiving node.

The receiving device 12 receives the ATM cell sent from the transmitting node as a ring-received optical signal through a ring, converts it into a ring-received electrical signal by optical-to-electrical conversion, and then receives a 32-bit unit by serial-to-parallel conversion. The data is converted into data, and a 3-bit receiving node identifier and a 3-bit transmitting node identifier of the first octet of the ATM cell are compared with a 3-bit node identification number in the receiving apparatus 12. The receiving node identifier of the first octet of the ATM cell is compared with the set node identification number, and if it is the same or broadcast cell, it is regarded as an ATM cell transmitted to its own node and stored in the extraction cell queue 31 in 53 octet units. When data is stored in the extraction cell queue 31, the programmable Almost Empty signal is enabled at TTL level 1, and the extraction cell read signal is extracted while the extraction cell read signal is TTL level 0. The extraction cell start signal synchronized with the read clock and the extraction cell output data in the form of 8-bit ATM cell are output to the ATM layer. However, when the result of comparing the reception node identifier of the first octet of the ATM cell and the set node identification number is different or is a broadcast cell, the data is stored in the transmitting apparatus 11 in 53 octet units because the ATM bypass cell is transmitted to the next node. The bypass cell start signal, bypass cell write signal, bypass cell write clock, and bypass cell input data are outputted to the transmitter 11 as much as possible. The ATM cell is discarded if the transmit node identifier of the first octet of the ATM cell is compared with the configured node identification number.

The system clock is used as a reference operation clock of the transmitter 11 and the receiver 12, and the reset signal initializes the transmitter 11 and the receiver 12.

2 is a configuration diagram of a transmission apparatus according to the present invention, the operation of the transmission apparatus with reference to this in more detail as follows.

The transmit cell queue 21 receives the local cell write signal, local cell write clock, local cell start signal, and local cell input data transmitted from the ATM layer, and synchronizes the local cell write clock while the local cell write signal is TTL level 0. Stores local cell start number and local cell input data in the form of 8-bit ATM cell.

The bypass cell queue 22 receives the bypass cell write signal, the bypass cell write clock, the bypass cell start number, and the bypass cell input data transmitted from the receiver 12 to write the bypass cell while the bypass cell write signal is TTL level 0. The bypass cell start signal synchronized with the clock and the bypass cell input data in the form of 8-bit ATM cell are stored.

The multiplexer 23 stores more than 53 octets of data in the transmission cell queue 21, reads data from the bypass cell queue 22 immediately before or does not store data in the bypass cell queue 22. Alternatively, when the data is not being read from the bypass cell queue 22, the local cell read signal and the local cell are transmitted using the programmable almost empty signal and the 53-degree counter input from the transmitting cell queue 21. Outputs the read clock to the transmit cell queue 21 and transfers the ATM cell stored in the transmit cell queue 21 to the local cell start signal and 8-bit unit by the local cell read clock while the local cell read signal is TTL level 0. Input data is read in 53 octets by 1: 1 hub-polling, and 8-bit data is demultiplexed into 32-bit data. Effective day ) By synchronizing the transmission data write signal to the transmission data of the unit parallel-to-serial conversion and outputs it to the unit 24. In addition, 53 or more octets of data are stored in the bypass cell queue 22, and data is not stored in the transmitting cell queue 21, or data is read from the transmitting cell queue 21 immediately before. 21), the bypass cell read signal and the bypass cell read clock are output to the bypass cell queue 22 by using the programmable maximum empty signal and the 53-degree counter input from the bypass cell queue 22. By using the bypass cell read clock, the ATM cell stored in the bypass cell queue 22 reads the bypass cell start signal and the bypass cell input data in 8-bit units by 53 octets while the bypass cell read signal is TTL level 0. Demultiplexes the unit data into 32-bit unit data and outputs the 56-byte (3 octet cell start + 53 octet valid data) transmission data to the parallel-serial conversion unit 24 in synchronization with the transmission data write signal. .

The parallel-serial conversion section 24 converts the 32-bit transmission data into a ring transmission electrical signal, which is a serial differential electric signal, and the electro-optical conversion section 25 converts the serial differential electric signal into an optical signal to convert an ATM cell. Is sent to the receiving node for the purpose.

3 is a configuration diagram of a receiving apparatus according to the present invention, the operation of the receiving apparatus with reference to this in detail as follows.

The photo-electric converter 34 receives an ATM cell sent from a transmitting node as a ring-received optical signal through a ring, and converts the ATM cell to a ring-received electrical signal which is a series differential electrical signal by photo-electrical conversion.

The serial-parallel conversion unit 33 converts the serial ring reception electrical signal into reception data in 32-bit units and synchronizes the converted reception data with the reception data write signal together with the reception data start signal to the reception cell processing unit 32. To pass.

The receiving cell processor 32 compares the 3-bit receiving node identifier and the 3-bit transmitting node identifier of the first octet of the ATM cell with the node identification number of the 3-bit unit, and the receiving node identifier of the first octet of the ATM cell. If the configured node identification number is the same or a broadcast type cell, data is stored in the extraction cell queue 31 in 53 octet units in consideration of an ATM cell transmitted to its own node. The method of storing data includes outputting the extraction cell start signal, the extraction cell input data, the extraction cell write clock, and the extraction cell write signal to the extraction cell queue 31, and outputting the extraction cell write signal to the extraction cell write clock while the extraction cell write signal is TTL level 0. The synchronized extraction cell start signal and the extraction cell input data in the form of 8-bit ATM cells are stored in the extraction cell queue 31 in 9-bit units. If the reception node identifier of the first octet of the ATM cell is compared with the set node identification number, or in the case of a broadcast type cell, the bypass cell queue 22 in the transmitter 11 in 53 octet units is a bypass cell transmitted to the next node. Save the data). The data is stored in the bypass cell write signal, the bypass cell write clock, the bypass cell start signal, and the bypass cell input data to the bypass cell queue 22 to output the bypass cell write signal to the bypass cell write clock while the TTL level is TTL level 0. The synchronized bypass cell start signal and input data in the form of 8-bit ATM cells are stored in the bypass cell queue 22 in 9-bit units.

On the other hand, when data is stored in the extraction cell queue 31, the programmable maximum empty signal is enabled at the TTL level 1, and the extraction cell read signal, extraction cell read clock, and node identification are identified from the ATM layer by this signal. The number is input, and while the extraction cell read signal is TTL level 0, the extraction cell start signal synchronized with the extraction cell read clock and the extraction cell output data in the form of 8-bit ATM cells are output to the ATM layer.

Also, if the transmission node identifier of the first octet of the ATM cell is compared with the set node identification number, the ATM cell is discarded.

In the present invention configured and operated as described above, since the transmission frame is the simplest by using a cell-based transmission method, the implementation structure is simple and the transmission processing is performed in 8-bit units by processing the transmission process in 32-bit units. Compared to the conventional technology, the same throughput can be provided at four times the speed of connecting more nodes on the ring. The present invention provides a high-speed communication service between subscriber access nodes based on ATM based on a single ring structure. It is used to provide in the public or private network area, and is applied to a transceiver such as a converged broadband network termination device, a centralized subscriber access node, an ATM local area network or an ATM Gigabit local area network.

Claims (3)

After receiving an Asynchronous Cell from an external transmitting node and converting it to Received Data, the identifier of the Asynchronous Cell is determined, and if it is an Asynchronous Cell transmitted to its node, the received data. Receiving means for storing and then transmitting to the asynchronous transfer mode (ATM) layer, and if the asynchronous transfer mode (ATM) bypass cell transmitted to the next node, the bypass cell to the next node, otherwise discarding the cell; And after receiving and storing an asynchronous transfer mode (ATM) cell from the asynchronous transfer mode (ATM) layer, and receiving and storing a bypass cell from the means, reading out the stored cell and demultiplexing the transmission data into a transmission signal. An asynchronous transmission mode (ATM) cell transceiver comprising a transmitting means for converting and transmitting to an external receiving node. 2. The apparatus of claim 1, wherein the receiving means comprises: optical / electric conversion means for converting an asynchronous transmission mode (ATM) cell received in the form of an optical signal from the transmitting node into an electrical signal; Serial / parallel conversion means for converting a serial type electric signal input from the optical / electric conversion means into parallel reception data of a predetermined bit; Receives the received data from the serial / parallel conversion means and determines whether it is an extraction cell transmitted to its own node or a bypass cell transmitted to the next node through node identification, and if it is a bypass cell, outputs it to the transmission means and discards the cell. Receiving cell processing means; And extracting cell storing means for storing the extracting cell output from the receiving cell processing means and outputting extracting cell data to the asynchronous delivery mode (ATM) layer. 3. The transmitting apparatus according to claim 1 or 2, wherein the transmitting means comprises: transmitting cell storing means for storing local cell input data inputted from the asynchronous transfer mode (ATM) layer; Bypass cell storage means for receiving and storing a bypass cell input from the receiving means; Multiplexing means for demultiplexing the data stored in the transmission cell storage means and the bypass cell storage means in a predetermined octet unit into transmission data; Parallel / serial conversion means for converting transmission data input from the multiplexing means into an electrical signal of serial form; and all / transforming the electrical signal input from the parallel / serial conversion means into an optical signal for transmission to the receiving node. An asynchronous transmission mode (ATM) cell transceiver comprising an optical conversion means.