KR19990050542A - Signal connection device between optical transmission devices - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a signal connection device between optical transmission devices.

2. The technical problem to be solved by the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a signal connection device capable of interconnecting STM-4 optical signals between a STM-4 optical transmission device and an STM-4 optical transmission device.

3. Summary of Solution to Invention

The present invention enables the high speed matching device in the STM-64 optical transmission device and the 12-channel AU3 electric signal to be interconnected so that the STM-4 optical signal can be interconnected between the STM-64 optical transmission device and the STM-4 optical transmission device. Thus, the utility of the STM-64 optical transmission device can be improved.

4. Important uses of the invention

The present invention is used in the optical transmission device.

Description

Signal connection device between optical transmission devices

The present invention relates to a signal connection device that enables an STM-4 optical signal to be interconnected between a STM (Synchronous Transfer Mode) -64 optical transmission device and an STM-4 optical transmission device.

Currently, the STM-64 optical transmission device with a transmission speed of 155 Mb / s is partially commercialized. Accordingly, in order to efficiently use the STM-4 optical transmission device and the STM-64 optical transmission device, which are already commercially available and used, a signal connection device that can receive signals from the existing STM-4 optical transmission device in the STM-64 optical transmission device is required. Was done.

Accordingly, the present invention enables interconnection between the high speed matching device in the STM-64 optical transmission device and the 12-channel AU3 electrical signal, thereby interconnecting the STM-4 optical signal between the STM-64 optical transmission device and the STM-4 optical transmission device. It is an object of the present invention to provide a signal connection device that makes it possible.

1 is a block diagram of an embodiment of a signal connection device between an STM-64 optical transmission device and an STM-4 optical transmission device according to the present invention;

* Explanation of symbols for the main parts of the drawings

1: optical / electric converter 2: demultiplexer

3: overhead handler 4: multiplexer

5: all-optical converter 6: STM-64 optical transmission device

7: STM-4 optical transmission device 8: Synchronous clock generator

9,10: Ray

In order to achieve the above object, the present invention converts and outputs an optical signal received from an external first optical transmission device into an electrical signal, and extracts and outputs a clock signal having substantially the same frequency and phase as the received optical signal. Optical / electric conversion means for; Demultiplexing means for demultiplexing and outputting an electrical signal received from the optical / electric conversion means, and extracting and outputting a receiving synchronous clock signal having substantially the same frequency and phase as the demultiplexed signal; A segment sum line extracted from the overhead of the demultiplexed signal after processing the overhead by frame-aligning and descrrambling the signal received from the demultiplexing means according to the received synchronous clock signal received from the demultiplexing means. And transmitting a serial signal of the communication channel data and the overhead processed signal, a frame signal and a clock signal for frame synchronization of the serial signal to an external second optical transmission device, and transmitting a serial data signal from the second optical transmission device. And converts the serial data signal into a parallel signal by inserting the summing signal and the communication channel data received from the second optical transmission device into the parallel signal, and then converts the parallel signal into a serial signal and outputs the parallel signal. Overhead processing means for; Multiplexing means for multiplexing and outputting the serial signal received from said overhead processing means in accordance with a synchronous clock signal; All / optical conversion means for receiving the multiplexed electrical signal from the multiplexing means and converting the converted electrical signal into an optical signal and outputting the converted optical signal to the first optical transmission device; And clock generation means for generating a synchronization clock signal for overhead processing and multiplexing and supplying the synchronization clock signal to the multiplexing means and the overhead processing means.

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

1 is a configuration diagram of a signal connection device between an STM-64 optical transmission device and an STM-4 optical transmission device according to the present invention.

First, the configuration of the signal connection device between the STM-64 optical transmission device and the STM-4 optical transmission device according to the present invention will be described.

The optoelectric converter 1 receives an STM-4 optical signal from an external STM-4 optical transmission device 7 via an optical path 9 and according to the recommendations of the International Telecommunication Union (ITU). After conversion, the data is transmitted to the 1: 4 demultiplexer (2). At this time, the photoelectric converter 1 extracts a clock signal having the same frequency and phase as the STM-4 signal and transmits the same to the STM-4 signal to the 1: 4 demultiplexer 2 to synchronize the STM-4 signal.

The 1: 4 demultiplexer (2) simply demultiplexes the serial STM-4 signal received from the opto-electric converter (1) into 1: 4 and separates it into 4 channels of 155 Mb / s signal before the overhead processor (3). To send. At this time, the 1: 4 demultiplexer 2 extracts the received synchronous clock signal having the same frequency and phase as the output 155Mb / s signal for synchronization of the output 155Mb / s signal, and transmits the received synchronization clock signal to the overhead processor 3.

The overhead processor 3 frame-aligns four channels of 155 Mb / s signals received from the demultiplexer 2 using the received synchronous clock signal received from the 1: 4 demultiplexer 2 and performs inverse processing for overhead processing. Descrambling Then, the interval-combination line and the data communication channel are extracted from the overhead of the demixed signal and transmitted to the high-speed connection of the STM-64 optical transmission device 6, and the 155Mb / s signals of the overhead-processed four channels are 12 channels. The AU3 is converted into an AU3 serial signal and transmitted to the high speed connection portion of the STM-64 optical transmission device 6. At this time, the frame signal and the clock signal are transmitted together to the high speed connection unit of the STM-64 optical transmission device 6 for frame synchronization of the AU3 signal.

In addition, the overhead processor 3 receives the 12-channel AU3 signal together with the frame signal and the clock signal from the high-speed connection of the STM-64 optical transmission device 6 to receive the 12-channel AU3 signal with 12-bit parallel STM-4. Convert to a signal. At this time, the overhead processor 3 inserts the interval-matching line and the communication channel data received from the high speed connection portion of the STM-64 optical transmission device 6 into the parallel STM-4 signal. Thereafter, the overhead processor 3 serially converts the 12-bit parallel STM-4 signal into four channels of 155 Mb / s signals and transmits the signals to the 4: 1 multiplexer 4.

The 4: 1 multiplexer 4 receives four channels of 155Mb / s from the overhead processor 3 and 4: 1 multiplexes the STM-4 signal according to the synchronous clock signal received from the synchronous clock generator 8. Transfer to the electro-optical converter 5.

The pre / optical converter 5 receives the STM-4 electrical signal from the 4: 1 multiplexer 4, converts the STM-4 electrical signal into an optical signal, and then transmits the optical signal to the STM-4 optical transmission device 7 through the optical path 10.

The high-speed connection in the STM-64 optical transmission device 6 performs the AU3 signal, mashing line and data communication channel connection functions with the overhead processor 3.

The STM-4 optical transmission device 7 transmits and receives an STM-4 optical signal with the optical / electric converter 1 and the electrical / optical converter 5 through optical paths 9 and 10.

The synchronous clock generator 8 is a system synchronous clock generator, and supplies clock signals necessary for overhead processing and multiplexing to the multiplexer 4 and the overhead processor 3, respectively.

Next, the operation of the signal connection device between the STM-64 optical transmission device and the STM-4 optical transmission device according to the present invention.

The opto-electric converter 1 receives an STM-4 optical signal from the STM-4 optical transmission device 7 according to the recommendations of the International Telecommunication Union (ITU-T) via the optical path 9. The received signal is converted into an STM-4 electrical signal and output to the demultiplexer 2. At this time, the optical / electric converter 1 extracts a clock signal having the same frequency and phase as the STM-4 electrical signal and outputs the same to the demultiplexer 2 for signal synchronization.

The demultiplexer 2 receives the STM-4 data and the clock signal received from the opto-electric converter 1, respectively, and then converts the STM-4 data into four channels of 155 Mb / s signals in parallel using the received clock. Output to the overhead processor 3. At this time, the demultiplexer 2 outputs a clock signal having the same frequency and phase as the 155 Mb / s signal of four channels to the overhead processor 3 for signal synchronization.

The overhead processor 3 receives four channels of 155 Mb / s signals and a receive synchronous clock signal received from the demultiplexer 2. The four-channel 155Mb / s signal is frame aligned after being converted to a 12-bit parallel STM-4 signal according to the receive synchronous clock signal. Parallel STM-4 signals are descrambled for overhead processing. The interval-matching line and communication channel data extracted from the overhead of the demixed signal are output to the high speed connection of the STM-64 optical transmission device 6. The overhead processed parallel STM-4 signal is converted into 12 channels of AU3 serial signals and output to the high speed connection of the STM-64 optical transmission device 6. At this time, the frame signal and the clock signal are respectively output to the high speed connection of the STM-64 optical transmission device 6 for frame synchronization of the AU3 signals.

On the other hand, 12 channels of AU3 signals are received from the high speed connection of the STM-64 optical transmission device 6 together with the frame and clock signals. The received 12-channel AU3 signal is purified from the synchronous clock generator 8 to the synchronous clock signal input through the multiplexer 4 and converted into a 12-bit parallel STM-4 signal. At this time, the interval matching line and the communication channel data received from the high speed connection of the STM-64 optical transmission device 6 are inserted in the overhead of the parallel STM-4 signal. Thereafter, the parallel STM-4 signal is serially converted into four channels of 155 Mb / s and output to the multiplexer 4.

The multiplexer 4 receives four channels of 155 Mb / s signals output from the overhead processor 3. The received four channels of 155Mb / s signals are converted to STM-4 electrical signals according to the recommendations of the International Telecommunication Union (ITU-T) by a 4: 1 multiplexing process and output to the electro-optical converter 5. At this time, the multiplexer 4 receives a synchronous clock signal supplied by the synchronous clock generator 8 as a synchronous clock signal for 4: 1 multiplexing.

The pre / optical converter 5 receives the STM-4 electrical signal from the multiplexer 4. The received signal is converted to the STM-4 optical signal and then transferred to the STM-4 optical transmission device 7 through the optical fiber 10.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

The present invention as described above has the effect that the STM-64 optical transmission apparatus can interconnect the optical signal with the STM-4 optical transmission apparatus currently used in the existing synchronization network, thereby increasing the effectiveness of the STM-64 optical transmission apparatus.

Claims (2)

Optical / electric conversion means for converting and outputting an optical signal received from an external first optical transmission device into an electrical signal, and extracting and outputting a clock signal having substantially the same frequency and phase as the received optical signal; Demultiplexing means for demultiplexing and outputting an electrical signal received from the optical / electric conversion means, and extracting and outputting a receiving synchronous clock signal having substantially the same frequency and phase as the demultiplexed signal; A segment sum line extracted from the overhead of the demultiplexed signal after processing the overhead by frame-aligning and descrrambling the signal received from the demultiplexing means according to the received synchronous clock signal received from the demultiplexing means. And transmitting a serial signal of the communication channel data and the overhead processed signal, a frame signal and a clock signal for frame synchronization of the serial signal to an external second optical transmission device, and transmitting a serial data signal from the second optical transmission device. And converts the serial data signal into a parallel signal by inserting the summing signal and the communication channel data received from the second optical transmission device into the parallel signal, and then converts the parallel signal into a serial signal and outputs the parallel signal. Overhead processing means for; Multiplexing means for multiplexing and outputting the serial signal received from said overhead processing means in accordance with a synchronous clock signal; All / optical conversion means for receiving the multiplexed electrical signal from the multiplexing means and converting the converted electrical signal into an optical signal and outputting the converted optical signal to the first optical transmission device; And Clock generation means for generating a synchronization clock signal for overhead processing and multiplexing and supplying the synchronization clock signal to the multiplexing means and the overhead processing means; Signal connection device between the optical transmission device comprising a. The method of claim 1, The optical / electric conversion means receives an STM-4 optical signal from an external STM-4 optical transmission device through an optical path, converts the STM-4 optical signal into an STM-4 electrical signal, and then transmits the optical signal to the demultiplexing means and synchronizes the STM-4 signal. In order to extract the clock signal substantially the same frequency and phase of the STM-4 signal and transmits to the demultiplexing means, The demultiplexing means demultiplexes the serial STM-4 signal received from the optical / electric conversion means into 1: 4, divides the signal into four channels of 155Mb / s, transmits the signal to the overhead processing means, and outputs the 155Mb. extracts a synchronous clock signal having a frequency and a phase substantially identical to a 155Mb / s signal outputted for synchronization of the / s signal, and transmits the received synchronization clock signal to the overhead processing means; The overhead processing means frame-aligns and descrambles four channels of 155 Mb / s signals received from the demultiplexing means by using the received synchronous clock signal received from the demultiplexing means to process the overhead. It extracts the interval matching line and communication channel data from the overhead of the demixed signal and transmits it to the external STM-64 optical transmission device, and converts the overhead processed 155Mb / s signal of 4 channels into 12 channels of AU3 serial signals. It transmits to the STM-64 optical transmission device, and transmits a frame signal and a clock signal to the STM-64 optical transmission device for frame synchronization of the AU3 signal, and 12 channels of AU3 signal and frame signal and clock from the STM-64 optical transmission device Receives a signal and converts 12 channels of AU3 signal into a 12-bit parallel STM-4 signal, and the interval matching line and communication received from the STM-64 optical transmission device Inserts channel data into a parallel STM-4 signal, serially converts a 12-bit parallel STM-4 signal into a 155 Mb / s signal of four channels, and transmits it to the multiplexing means; The multiplexing means receives 155 Mb / s signals of four channels from the overhead processing means and performs 4: 1 multiplexing with an STM-4 signal according to a synchronous clock signal received from the synchronous clock generating means to convert the pre / optical conversion means. Send, And said all-optical conversion means receives an STM-4 electrical signal from said multiplexing means, converts it into an optical signal, and transmits it to said STM-4 optical transmission device via an optical path.