KR20040003508A - mapping device for SDH - Google Patents

Abstract

PURPOSE: An SDH(Synchronous Digital Hierarchy) mapping device is provided to directly interface Ethernet data or MAC data, and to multiplex the interfaced data, then to transmit the multiplexed data to an SDH device by mapping the data in signal format, thereby immediately transceiving the data with an SDH. CONSTITUTION: A band limit interface(2) interfaces Ethernet data or MAC data, or performs a reverse process. A multiplex switching unit(3) analyzes a source address and a destination address of the interfaced data, switches the data to a port, and transmits multiplexed data or performs a reverse process. A form converter(4) converts the multiplexed Ethernet data or the MAC data in SDH type, or performs a reverse process. A mapping unit(6) maps the SDH data into an SDH signal, outputs the SDH signal or performs a reverse process. A microcomputer(8) controls functions of the SDH mapping unit(6).

Description

Synchronous digital hierarchy mapping device {mapping device for SDH}

The present invention relates to a synchronous digital hierarchy mapping apparatus, and more particularly, to a synchronous digital hierarchy mapping apparatus for directly interfacing multiplexing Ethernet or mator and then mapping the signal format of the SDH method to the SDH apparatus.

In general, the transmission technology began with the spiral carrier in the 1910s, developed into the analog transmission technology, and in the form of the digital transmission technology. Later, the digital transmission technology has evolved the development of the D1 channel bank with a 1.544Mbps transmission speed in the 1960s. It was. Moreover, such digital technology has been applied to the field of exchange technology in the mid-1970s. It has revolutionized the multiplexing of wired transmission systems by introducing the digital relay switch called 4ESS. In addition, the digital transmission method has been developed into an optical transmission method using an optical cable as a transmission medium, and based on this, there is a trend of changing from an asynchronous PDH transmission system to a synchronous SDH transmission system.

However, the SDH transmission system as described above transmits and receives and processes Ethernet or MAC data by connecting the Internet or other ADSL network to each subscriber device, for example, a subscription device such as a PC. Separate signal conversion devices are used between the subscriber device and the SDH transmission system to process Ethernet or MAC data as ATM data and convert the processed ATM data back to the SDH method.

Then, referring to FIG. 1, the signal conversion device of the conventional SDH transmission system as described above is converted to an ATM signal by receiving and processing Ethernet or MAC data transmitted from the modem 71 of the subscriber device, for example, the PC 70. Alternatively, the ATM processing unit 72 performs the reverse process, and converts the ATM signal transmitted from the ATM processing unit 72 into the SDH signal and transmits the SDH signal to the SDH transmission unit 73 or performs the reverse process. SDH mapping device unit 74 is included.

Here, the ATM processing unit 72 may be provided with a modem 75, the modem 75 may process data of the ADSL method.

On the other hand, referring to the operation of the signal conversion device of the conventional SDH transmission system as described above, first, when the Ethernet device or the MAC data is transmitted upward from the subscriber device 70, for example, the packet signal of the uplink transmitted Ethernet or MAC data is It is modulated by the modem 71 of the subscriber device 70 and then received by the ATM processing unit 72. Then, the ATM processing unit 72 demodulates the packet signal of the input Ethernet or MAC data through the modem 75 and then 53-byte ATM cell signal through the complex process of the demodulated packet signal of the Ethernet or MAC data. Multiplexed to and transmitted to the SDH mapping unit 74.

Here, the ATM processing unit 72 transmits a dummy cell signal to the SDH mapping unit 74 even if there is no data transmitted upward from the subscriber unit 70.

In addition, the SDH mapping device unit 74 maps the input ATM cell signal of the Ethernet or MAC data by the SDH method and then transmits the signal to the SDH transmission device 73. Then, the SDH transmitter 73 analyzes the received SDH signal and transmits the signal to the corresponding destination.

On the other hand, when the SDH signal including the Ethernet or Mc data from the other transmission system is received by the SDH transmission device 73 is transmitted down through the reverse process.

However, the signal conversion device of the conventional SDH transmission system as described above, when transmitting or receiving the Ethernet or MAC data with the SDH transmission device, must process the Ethernet or MAC data as an ATM cell signal through a complicated process and then transmit the same. Significantly increased the manufacturing cost of the signal conversion device, and also, the ATM processing unit 72 should always transmit the dummy cell signal even if data is not received from the subscriber device 70, thereby limiting the efficient use of the channel. The problem arises.

Accordingly, the present invention has been invented to solve the above-mentioned conventional problems, and the Ethernet or Mac data are directly interfaced and multiplexed, and then mapped to the SDH signal format and transmitted to the SDH device, thereby transferring the Ethernet or Mac data to the SDH device. The purpose of the present invention is to provide a synchronous digital hierarchy mapping device that significantly reduces the manufacturing cost of the SDH transmission system since it is directly transmitted and received with the SDH without a separate complicated converter for transmission.

Another object of the present invention is to provide a synchronous digital hierarchy mapping device that can significantly reduce the dummy cell transmitted according to the presence or absence of Ethernet or Mcdata, thereby improving the efficiency of channel use.

In order to achieve the above object, the present invention provides a bandwidth limiting interface unit for interfacing Ethernet or MAC data transmitted upward from a subscriber device or executing a reverse process thereof, a source address of data inputted from the bandwidth limiting interface unit, A multiplexing switch which analyzes a destination address, switches to a corresponding port, multiplexes data required for multiplexed transmission, or performs the reverse process, and converts multiplexed Ethernet or MAC data inputted from the multiplexed switch to SDH method. A format conversion unit for performing a reverse process or the reverse process, a mapping unit for mapping the SDH format data input from the format conversion unit to an SDH signal and outputting the SDH signal to the SDH transmission apparatus, or performing the reverse process, and the mapping unit. MICOM to control overall function of SDH mapping device including It provides a synchronous digital hierarchy mapping apparatus consisting of.

1 is an explanatory diagram showing a conventional SDH mapping device.

2 is an explanatory diagram illustrating an SDH mapping device of the present invention.

<Detailed Description of Codes>

1: Subscriber device 2: Band-limited interface unit

3: multiplexing switching unit 4: format conversion unit

5: SDH transmission device 6: mapping unit

7: SDH mapping device 8: Microcomputer

9: buffer

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

As shown in FIG. 2, the apparatus of the present invention interfaces a subscriber device 1, for example, an Ethernet or MAC data transmitted upstream from a PC, and executes a band limitation of the subscriber device 1 or vice versa. Analyzes the source address and destination address of the data input from the limiting interface unit 2 and the band limiting interface unit 2, switches to the corresponding port, and multiplexes the data requiring multiplexing transmission. The multiplexing switching unit 3 performing the reverse process or the reverse thereof, and converting the multiplexed Ethernet or MAC data inputted from the multiplexing switching unit 3 using an SDH method, for example, a protocol of POS or EOS, or the reverse. A format conversion unit (4) performing the process of, and SDH transmission device by mapping the SDH format data input from the format conversion unit 4 to the SDH signal ( 5) a mapping unit 6 for outputting to or vice versa, and a microcomputer 8 for controlling the overall function of the SDH mapping apparatus 7 including the mapping unit 6.

Here, the multiplexing switching section 3 has a buffer 9 for switching the input data.

In addition, the subscriber device 1 may be provided with a modem () capable of processing Ethernet or MAC data.

Next, the operation and effects of the present invention as described above will be described.

First, when Ethernet or MAC data is transmitted upward from the subscriber device 1, for example, a PC, the packet signal of the uplink transmitted Ethernet or MAC data is modulated by the modem of the subscriber device 1, and then the bandwidth limiting interface. It is received by the unit (2).

At this time, the band limiting interface unit 2 determines whether or not the data received from each subscriber device 1 is data within a predetermined band under the control of the microcomputer 8 to determine whether to receive the data. And, if the Ethernet or MAC data received from the subscriber device 1 is the data of the allowed band, it receives and switches it.

That is, the band limiting interface unit 2 interfaces the received Ethernet or MAC data and outputs the signal to the multiplexing switching unit 3 when it is a signal of the allowed band. Then, the multiplexing switching unit 3 stores the input Ethernet or MAC data in the buffer 9 according to the function control signal of the microcomputer 8 and then source and destination addresses of these data. ) And then switch to the corresponding port. If the input data is a signal that does not require multiplexing, transmit the signal to the corresponding port, and if the signal requires multiplexing, multiplex these signals and output them to the format converter 4. . The format converting unit 4 converts the multiplexed Ethernet or MAC data inputted from the multiplexing switching unit 3 according to the function control signal of the microcomputer 8 into the SDH method, for example, a packet over SDH (POS) or EOS (Ethernet). over SDH) to convert to SDH format and output to mapping section 6. Then, the mapping unit 6 maps the SDH format data input from the format conversion unit 4 to the SDH signal in accordance with the function control signal of the microcomputer 8 by adding an overhead or the like to the SDH transmission device 5. ) At this time, the signal transmitted to the SDH transmitter 5 by the mapping unit 6 is transmitted without including an unnecessary dummy cell. If there is no uplink data, the unnecessary dummy cell signal is not transmitted to the SDH transmitter 5. .

On the other hand, when downlink transmission from the SDH transmission device 5 to the subscriber device 1 occurs, the SDH signal transmitted from the SDH transmission device 5 is reversed from the above. Is sent).

Therefore, according to the present invention, the Ethernet or MAC data of the subscriber apparatus 1 can be transmitted directly to the SDH transmission apparatus without providing a separate converter.

As described above, according to the present invention, an Ethernet or Mac data is directly interfaced and multiplexed, and then mapped to a SDH signal format to be transmitted to the SDH device. Since it is directly transmitted and received with and without the SDH, the manufacturing cost of the SDH transmission system is significantly reduced accordingly.

In addition, according to the present invention, since the dummy cell transmitted according to the presence or absence of Ethernet or Mc data can be reduced to a minimum, the efficiency of channel use is also significantly improved.

Claims (2)

Band-limited interface unit that interfaces Ethernet or MAC data transmitted from subscriber device or performs reverse process, source address and destination address of data input from the band-limited interface unit are analyzed and switched to the corresponding port and multiplexed A multiplexing switching unit for multiplexing the data that needs to be transmitted or performing the reverse process, and a format conversion unit for converting the multiplexed Ethernet or MAC data inputted from the multiplexing switching unit into the SDH method or vice versa. And a mapping unit for mapping the SDH format data inputted from the format conversion unit into an SDH signal and outputting the data to the SDH transmission apparatus or vice versa, and controlling the overall function of the SDH mapping apparatus including the mapping unit. Synchronous D, characterized in that consisting of a microcomputer Whisk hierarchy mapping device. 2. The synchronous digital hierarchy mapping apparatus as claimed in claim 1, wherein the bandwidth limiting interface unit enforces bandwidth usage of uplink Ethernet or MAC data transmitted from a subscriber station.