KR20000046196A - Apparatus for interfacing atm-lan and method for interfacing using the same - Google Patents

Abstract

PURPOSE: An apparatus for interfacing ATM-LAN and a method for interfacing using the same is provided to reduce the number of elements constituent of interface by using a framer part when the switched data is transmitted a series and parallel conversion part, and easily manage a traffic by enabling the forwarding and blocking of cell according to VPI and VCI in a transmission MUX and queue controlling part of an ATM utopia MUX. CONSTITUTION: A switching part(10) is in charge of ATM switching. A plurality of routing tables(11) generate an ATM cell of a utopia first level by receiving and combining data switched in the switching part. An ATM utopia MUX part(12) receives the ATM cell of the utopia first level generated in the plurality of routing tables and converts to an ATM cell of a utopia second level. A framer part(13) converts a frame of the ATM cell of a utopia second level. A photoelectric conversion part(15) photoelectric converts the converted ATM cell data.

Description

Asynchronous transmission mode-premises information network interface device and interface method using same

The present invention relates to an asynchronous transmission mode-premises information network (ATM-LAN) interface device and an interface method using the same, and more particularly, to make it suitable for traffic management of an asynchronous transmission mode cell using an asynchronous transmission mode Utopia interface mux. The present invention relates to an interface device between an asynchronous transmission mode-premises information network and an interface method using the same.

Hereinafter, with reference to the accompanying drawings will be described a conventional asynchronous transmission mode-premises information network (ATM-LAN) interface device and method.

1 is a block diagram for implementing a conventional asynchronous transmission mode-premises information network (ATM-LAN) interface.

A hardware configuration for implementing a conventional asynchronous transmission mode-premises information network (hereinafter, simply referred to as ATM-LAN) interface is shown in Figure 1, the switch unit 1 receives the switched data and combines the 53 bytes ( By the first to the fourth routing table (2a) (2b) (2c) (2d) to generate an ATM cell of Byte), and the first to fourth routing table (2a) (2b) (2c) (2d) First to fourth interface units 3a, 3b, 3c, 3d for converting the transmitted ATM cells into electrical signals, and first to fourth interface units 3a, 3b, 3c, 3d. Mux / demux (4) for multiplexing the transmitted data, serial / parallel conversion section (5) for converting the multiplexed transmitted data in series, and 622Mbps optical for converting the serially converted data into optical signals It consists of the module part 6.

At this time, the clock recovery unit 7 is a part for generating the reference clock by receiving the Rx data on the line when generating the transmission and reception clock.

In the conventional ATM-LAN interface method, the data switched by the switching unit 1 is combined in the first to fourth routing tables 2a, 2b, 2c, and 2d to form a 53-byte ATM cell. This generated cell is transmitted to the first to fourth interface units 3a, 3b, 3c, and 3d, which are optical carrier 3 (OC3) physical interface chips using the ATM Utopia interface first level. do. At this time, the transmission rate of the OC3 level is 155Mbps.

In the first to fourth interface units 3a, 3b, 3c, and 3d, a cell is inserted into a payload portion in an OC3 frame to be converted into an ECL (Emitter Coupled Logic) signal, thereby mux / demux. Send to (4).

In the mux / demux (4), each ECL signal is multiplexed to generate an OC12 (Optical Carrier 12: 622 Mbps) frame, and the parallel data of the frame is converted into a serial signal by the serial / parallel converter 5. The ECL signal is transmitted from the optical module via the optical module unit 6.

Meanwhile, the reception process in the optical module is as follows.

The optical signal received by the optical module unit 6 is converted into an ECL signal via the optical module unit 6 and input to the serial / parallel conversion unit 5.

The serial / parallel converter 5 converts the serial data ECL signal into parallel data and transmits the same to the mux / demux 4.

In the mux / demux 4, the parallel ECL signal is demultiplexed by a round robin method and transmitted to the first to fourth interface units 3a, 3b, 3c, and 3d.

The first to fourth interface units 3a, 3b, 3c, and 3d of the utopia first level extract ATM cells in the OC3 frame and use the first and fourth routing tables using the ATM utopia interface first level. (2a) (2b) (2c) (2d).

In the first to fourth routing tables 2a, 2b, 2c, and 2d, this corresponds to a designated virtual path identifier / virtual channel identifier (hereinafter, abbreviated as VPI / VCI). It transmits to the switching unit 1 for switching the data in the path (Path).

The conventional ATM-LAN interface apparatus and method have the following problems.

First, when the switched data is transmitted to the serial / parallel converter, it uses four separate first to fourth interfaces and a mux / demux to bundle them into one trunk.

Second, since OC12 is implemented by binding the OC3 ECL signals in the first to fourth interfaces, there is a problem in that the traffic management of the cell is not possible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an asynchronous transmission mode-premises information communication network capable of managing traffic of an ATM cell using an ATM utopia mux when implementing an ATM-LAN interface. An interface device and an interface method using the same are provided.

According to one aspect of the present invention for achieving the above object, by switching the switching unit responsible for asynchronous transmission mode (ATM) switching and the data switched in the switching unit by combining the Utopia first level ATM cell A plurality of routing tables to be generated, an ATM utopia mux unit for receiving the utopia first level ATM cells generated from the plurality of routing tables and converting them into ATM cells of a utopia second level, and an ATM cell of the utopia second level And a framer unit for converting the frame of the photoelectric converter and a photoelectric converter for photoelectrically converting the converted ATM cell data.

Preferably, the utopia mux unit is a reception demux unit for evenly distributing a plurality of 53-byte ATM cells, and a transmission to determine whether the ATM cell generated in the plurality of routing tables is a runt cell, and transmits only normal cells to the framer unit. It is configured to include a mux and a queue control unit.

According to another aspect of the present invention for achieving the object as described above, generating an ATM cell of the utopia first level by receiving and combining any data, the generated utopia first level ATM cell, Switching to a two-level ATM cell, converting a frame of the utopia second-level ATM cell, and photoelectrically converting the converted ATM cell data.

According to the present invention as described above, the interface element can be saved, and traffic management can be facilitated.

1 is a block diagram for implementing a conventional asynchronous transmission mode-premises information network interface

2 is a block diagram for implementing the asynchronous transmission mode-premises information network interface of the present invention.

3 is a block diagram of the present invention asynchronous transmission mode utopia mux

Figure 4 is a detailed block diagram of the present invention utopia mux

5 is a flowchart illustrating the steps of photoelectrically converting an ATM cell of the present invention.

Explanation of symbols for the main parts of the drawings

10: switching unit 11: routing table

12: ATM Utopia mux part 13: Framer part

14: serial / parallel converter 15: photoelectric converter

16: clock recovery unit

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram for implementing an asynchronous transmission mode-premises information communication interface of the present invention.

As shown in FIG. 2, the hardware configuration for implementing an interface between the asynchronous transmission mode-premises information communication network (hereinafter, simply referred to as ATM-LAN) includes a switching unit 10 for ATM switching, and a switching unit. First to fourth routing tables 11a, 11b, 11c, and 11d for receiving the data switched in the Mn and combining the combined data to generate 53 bytes of ATM cells, and the first to fourth routing tables ( (11a) (11b) (11c) and (11d) an ATM utopia mux unit (12) for adjusting the utopia level of an ATM cell, and a serial-to-parallel converter (10) for converting an ATM cell whose utopia level is adjusted to serial data ( 14) and a photoelectric conversion section 15 for converting the serially converted serial signal data into an optical signal.

At this time, a framer unit 13 is further formed between the ATM utopia mux unit 12 and the serial / parallel conversion unit 14 to convert the frame of the ATM cell whose utopia level is converted.

3 is a block diagram of the asynchronous transmission mode utopia mux of the present invention, Figure 4 is a detailed block diagram of the utopia mux of the present invention.

As shown in Figs. 3 and 4, the asynchronous transmission mode utopia mux of the present invention comprises a receiving demux 12a, a transmission mux and queue control section 12b, and a microprocessor 12c.

Receiving demux 12a uses an 8-bit 25 MHz (Utopia first level) data bus for four ports (first through fourth routing tables 11a, 11b, 11c and 11d) of the first through fourth ATM utopia. It has a physical port (TPHY1_PORT) (TPHY2_PORT) (TPHY3_PORT) (TPHY4_PORT) (Transmit Physical), and the ATM Utopia ATM port has one 16-bit 50 MHz (Utopia Second Level) data bus.

Therefore, the receiving demux unit 12a evenly distributes 53 bytes of ATM cells from the ATM port RATM_PORT to four physical ports RPHY1_PORT, RPHY2_PORT, RPHY3_PORT, and RPHY4_PORT in a round robin manner. .

The transmission mux and queue control unit 12b determines whether the ATM cell is a run cell of the four physical ports TPHY1_PORT, TPHY2_PORT, TPHY3_PORT, and TPHY4_PORT. VCI) is checked, and only the normal cell is put in a queue of each port in the external memory unit 17, and the contents of the queue are transmitted to the ATM port TATM_PORT in a round robin manner.

At this time, the runt cell is a cell in which an error occurs in the ATM cell, and a cell composed of 10, 43, and 45 bytes, not a 53-byte cell, in which the ATM cell size is not normal.

Such an ATM-LAN interface method of the present invention will be described with reference to FIGS. 2 to 5.

As shown in FIG. 2 and FIG. 5, the cells switched by the switching unit 10 pass through the first to fourth routing tables 11a, 11b, 11c, and 11d, respectively, to the 8-bit utopia first level buses. Pass through to generate an ATM cell of the utopia first level (100).

Subsequently, when the ATM cell of the utopia first level is inputted to the utopia mux unit 12, the ATM utopia mux unit 12 directly inspects the ATM cell to determine whether an error occurs, and the ATM cell of the first level is determined as the second level. The cell is switched to the ATM cell (101), stored in the external memory unit 17, taken out of the queue in a round robin manner, and transferred to the framer unit 13.

Then, the framer unit 13 converts the frame of the received cell into an OC12 frame (102), transfers it to the serial / parallel conversion unit 14 as parallel data, and the serial / parallel conversion unit 14 converts the frame to ATM. The cell data is converted into an ECL signal and transmitted to the photoelectric converter 16.

The photoelectric conversion unit 16 converts the ECL signal into an optical signal and transmits the signal.

The ATM-LAN interface device and method of the present invention as described above has the following effects.

First, since the framer unit is used to transmit the switched data to the serial-to-parallel converter, the number of devices configuring the interface can be reduced.

Second, in the transmission mux and queue control unit of the ATM utopia mux, forwarding and blocking of cells according to VPI / VCI are possible, so traffic management is easy.

Claims (3)

A switching unit in charge of asynchronous transmission mode (ATM) switching; A plurality of routing tables configured to receive and combine the data switched by the switching unit to generate an ATM cell of a utopia first level; An ATM utopia mux unit for receiving ATM cells of the utopia first level generated in the plurality of routing tables and converting them to ATM cells of the utopia second level; A framer unit for converting a frame of the ATM cell of the utopia second level; And a photoelectric conversion unit for photoelectrically converting the converted ATM cell data. 2. The apparatus of claim 1, wherein the utopia mux unit receives a demux unit for equally distributing a plurality of 53-byte ATM cells, and determines whether the ATM cell is a runt cell generated in the plurality of routing tables, and determines only normal cells to the framer unit. And a transmission mux and a queue control unit for transmitting. Generating an utopia first level ATM cell by receiving and combining any data; Converting the generated utopia first level ATM cell into an utopia second level ATM cell; Converting a frame of the ATM cell of the utopia second level; Photoelectric conversion of the converted ATM cell data.