KR19990050538A - Data Demultiplexer in Branch-coupled Optical Transmission System - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a data demultiplexing apparatus in an optical transmission system.

2. The technical problem to be solved by the invention

The present invention provides a data demultiplexing apparatus in a branch-coupled optical transmission system that demultiplexes a high-speed signal into a low-speed signal in a linear or annular network, and then changes a time slot in AU units and transmits it to a subordinate signal processing unit capable of branch combining processing. To provide.

3. Summary of Solution to Invention

The present invention includes a receiver for converting a high speed optical signal into an electrical signal and extracting a clock; A demultiplexer which demultiplexes an electrical signal using a received clock and converts the electrical signal into a low speed signal; An overhead processing unit for processing an overhead of reproduction and multiple sections; A time slot changing unit for changing the time slot in units of management units according to the control signal; An output unit for retiming and outputting the received output data; And connecting means for monitoring playback and multi-section overhead, outputting a monitoring control signal, and transferring the control signal to the timeslot changer.

4. Important uses of the invention

The present invention is used in optical transmission networks and the like.

Description

Data Demultiplexer in Branch-coupled Optical Transmission System

The present invention converts the high-speed optical signal received in the branch-coupled optical transmission system into an electrical signal, demultiplexes the signal into a low-speed signal, and then changes the time slot in units of an administration unit (AU) to transmit the signal to the subordinate signal processor. The present invention relates to a data demultiplexing apparatus in a branch coupled optical transmission system.

The technical field for performing timeslot control in a conventional optical transmission system uses synchronous transfer mode-1 (STM-1), STM-4, and STM-16 demultiplexing techniques, but STM-64 signals. There is no demultiplexing device that demultiplexes and performs timeslot control.

Therefore, after demultiplexing a 10 Gb / s signal into 128 78 Mb / s low-speed signals in a linear or annular network, the data must be de-multiplexed before sending the low-speed signals to the STM-1, STM-4, and STM-16 slave signal processors. There is a need for a data demultiplexer for changing the timeslot.

The present invention devised in response to the demands described above is to demultiplex a high speed signal into a low speed signal in a linear or annular network, and then change the time slot in AU units to transmit to a subordinate signal processing unit capable of branch combining processing. It is an object of the present invention to provide a data demultiplexing device in a branch-coupled optical transmission system.

1 is a block diagram of an embodiment of a data demultiplexing apparatus according to the present invention;

* Explanation of symbols for the main parts of the drawings

11: light receiving unit 12, 13: demultiplexer

14: overhead processing unit 15: timeslot control unit

16: data output unit 17: processor interface unit

18: slave signal processing unit

In order to achieve the above object, the present invention provides a data demultiplexing apparatus of an optical transmission system, comprising: receiving means for converting a high speed optical signal received from the outside into an electrical signal and extracting a clock; First demultiplexing means for demultiplexing an electrical signal using a clock received from the receiving means and converting the electrical signal into a low speed signal; Overhead processing means for processing reproduction of frames of the output data of the first demultiplexing means and overhead of multiple sections; Time slot changing means for changing the time slot in units of administration units (AUs) according to a control signal of the output data of the overhead processing means; Output means for retiming and outputting the output data of the timeslot changing means; And connected to the overhead processing means for monitoring and reproducing and multi-section overhead, and connected to the receiving means for detecting and processing an alarm for an optical reception signal, outputting a monitoring control signal to the outside, and outputting a control signal from the outside. And a connecting means for receiving the input and transmitting the same to the timeslot changing means.

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

1 is a block diagram of an embodiment of a data demultiplexing apparatus according to the present invention.

The present invention converts a high-speed optical signal into an electrical signal, extracts a clock, and includes a first demultiplexer 12 which demultiplexes the output data of the optical receiver 11 into a medium speed signal. A second demultiplexer 13 for demultiplexing the output data of the first demultiplexer 12 into a low-speed signal, and an in-frame reproduction / multiple section overhead of the output data of the second demultiplexer 13; Retime the output data of the overhead processing unit 14 for processing the data processing unit, the time slot control unit 15 for changing the time slot in the AU unit for the output data of the overhead processing unit 14, and Connected to the data output unit 16 to the dependent signal processing unit 18, the external optical transmission system monitoring control unit, the optical receiving unit 11, the overhead processing unit 14, and the timeslot control unit 15 to reproduce and Monitor multi-section overhead and detect alarms on light-received signals The processor interface unit 17 is provided.

The optical receiver 11 receives the 10Gb / s optical signal, converts it into an electrical signal (ie, STM-64), extracts a clock of 10 GHz, and transmits it to the first demultiplexer 12.

The first demultiplexer 12 demultiplexes the 10Gb / s electrical signals and clocks received from the optical receiver 11 into 1:16, converts them into 16 622Mb / s parallel signals and a 16-divided 622MHz clock. Transmit to the second demultiplexer (13).

The second demultiplexer 13 demultiplexes 16 622 Mb / s parallel signals and 16 divided 622 MHz clocks received from the first demultiplexer 12 into 1: 8 and decodes 128 78 Mb / s parallel signals. The clock is converted into an eight-minute clock of 78 MHz and transmitted to the overhead processor 14.

The overhead processor 14 monitors and transmits the overhead of the reproduction and the multi-segment in the STM-64 frame from the output data of the second demultiplexer 13 to the processor interface 17, and the information data is transparent. The data is transmitted to the timeslot control unit 15.

The timeslot control unit 15 divides the corresponding data among the 10Gb / s data into an administrative unit (AU) unit so that the overhead processing unit 14 can branch the information data into the overhead signal processing unit 18 by branching. The time slot is changed to the data output unit 16.

The data output unit 16 is composed of four data output units 16-1 to 16-4, and each of the data output units 16-1 to 16-4 outputs the output data of the timeslot control unit 15. The retiming is performed in units of 2.5 Gb / s and transmitted to the slave signal processor 18.

The processor interface unit 17 is connected to the overhead processing unit 14 to monitor playback and multi-section overhead, and is connected to the light receiving unit 11 to detect and process an alarm for an optical reception signal. In addition, the system operator receives the operator command to control the time slot and processes the command to be processed by the timeslot control unit 15.

The slave signal processor 18 may consider the STM-1, STM-4, and STM-16 slave signal processors 18-1 to 18-3, and mount the branch and the coupling unit therein to output the data output unit 16. By processing the output data at a low speed 2.5Gb / s signal capacity unit, unnecessary data processing can be prevented.

Looking at the operation of the data demultiplexing apparatus according to the present invention having the configuration as described above are as follows.

First, the 10Gb / s optical signal input from the outside is received by the optical receiver 11 and converted by a demultiplexer 12, 13 into a low-speed signal to match with the slave signal processor 18.

In terms of the system, converting a high speed 10Gb / s signal into a low speed signal should be designed in consideration of an external slave signal processor 18, and the slave signal processor 18 mounted in a high speed 10Gb / s optical transmission system. ) May take into account the STM-1, STM-4, and STM-16 dependent signal processing units 18-1 to 18-3. Therefore, in order to directly match the STM-1, STM-4, and STM-16 slave signal processing units 18-1 to 18-3 with an electrical signal, a high speed 10Gb / s signal must be converted into a low speed signal.

In addition, the signal capacity processed by the STM-1, STM-4, and STM-16 slave processing units 18-1 to 18-3 may be processed in units of 2.5 Gb / s, and the STM-1 dependent signal processing unit The 18-1 may process 16 STM-1 signals, and the STM-4 dependent signal processing unit 18-2 processes four STM-4 signals. In addition, the STM-16 dependent signal processor 18-3 may process one STM-16 signal.

Accordingly, the slave signal processor 18 selects one of the STM-1, STM-4, and STM-16 slave signal processors 18-1 to 18-3 in units of 2.5 Gb / s capacity according to the slave signal to be connected. do. In this way, it is possible to connect to the plurality of subordinate signal processing units 18-1 to 18-3 by considering only the electrical connection in units of 2.5 Gb / s signal capacity.

As described above, the 10Gb / s optical signal input from the outside is converted into a 10Gb / s electric signal and a clock of 10 GHz by the optical receiver 11 and transmitted to the first demultiplexer 12.

The first demultiplexer 12 generates a 10 Gb / s data stream received from the optical receiver 11 and a 10 GHz clock by 1:16 using a 10 GHz clock by a simple bit deinterleaving method. 16 622 Mb / s signals and 16 622 MHz generated clocks are converted to the second demultiplexer 13 for transmission.

Thereafter, the second demultiplexer 13 uses the 16-divided 622 MHz clock to transmit 16 622 Mb / s data streams and the 16-divided 622 MHz data received from the first demultiplexer 12 in a simple bit deinterleaving manner. The clock is converted to 128 78 Mb / s signals having a capacity of 10 Gb / s generated by demultiplexing the signal 1: 8 and a clock of 78 MHz generated by dividing 8 times and transmitted to the overhead processor 14.

The overhead processor 14 detects a frame sync signal by processing a playback section overhead byte in an STM-64 frame recommended by International Telegragh and Telephone Consultative Committee (ITU-T) G.703. After the seven-stage descrambling is performed, the reproduction and multi-section overhead bytes are processed and transmitted to the processor interface unit 17. In addition, the information data is transmitted to the time slot controller 15 in a transparent manner.

Next, the time slot controller 15 may branch-couple the 128 Gb / s data of the 10Gb / s capacity received from the overhead processor 14 from the slave signal processor 18 used according to the operator's command. By changing the time slot in units of management units (AU), four HOUT signals consisting of eight 78 Mb / s data, one 78 MHz clock, and eight frame synchronization signals of 4 KHz are each assigned to four data outputs 16 send.

In particular, the timeslot control unit 15 is a 2.5Gb / s low-speed signal obtained by demultiplexing the 10Gb / s signal in the first and second demultiplexers 12, 13 of the 10Gb / s optical transmission system in a ring or linear network By changing the time slot in AU units so that the STM-1, STM-4, and STM-16 slave signal processing units 18-1 to 18-3, which are processed as signal capacities, can branch-couple to 2.5 Gb / s signal capacities. By transmitting, the slave signal processing unit 18 allows the connection and the branch to be processed in units of 2.5 Gb / s signal capacity.

Meanwhile, the data output unit 16 transmits four HBUS signals having the 2.5Gb / s signal capacity received from the timeslot control unit 15 to the slave signal processing unit 18. Here, each of the STM-1, STM-4, and STM-16 slave signal processing units 18-1 to 18-3 in the slave signal processing unit 18 is mounted at different positions, so that the HBUS signal is stored in each slave signal processing unit ( 18-1 to 18-3) retimes the 4 HBUS signals consisting of eight 78 Mb / s signals and one frame sync signal to a 78 MHz clock in order to reduce the phase of the signal that changes according to the path reaching 18-1 to 18-3. Each slave signal processor 18-1 to 18-3 is transmitted.

The processor interface unit 17 collects and processes the STM-64 overhead processing data processed by the overhead processing unit 14 for the reproduction / multi-section overhead and the alarm signal for the 10Gb / s optical input signal from the optical receiving unit 11. To the 10Gb / s optical transmission system monitoring control unit.

The processor interface unit 17 decodes a control bus and an address bus signal such as data, read / write, enable, and address strobe to input and output data of a corresponding data register. In addition, the operator receives an operator command to control the time slot of the timeslot controller 15 through the processor interface unit 17 and processes a signal between the timeslot controller 15 and the processor.

Finally, the slave signal processor 18 receives four HBUS signals having a 2.5Gb / s signal capacity by demultiplexing the 10Gb / s signal into a low speed signal and rearranging the timeslots. In addition, by securing a reserve transmission line in a ring or linear network, it is possible to communicate using a reserve channel that can be bypassed when a problem occurs in one transmission line, and control the branch coupling to connect and branch the dependent signals. It also handles pointer processing for speed compensation with power and STM-1, STM-4, and STM-16 signals.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

In the present invention as described above, since only the electrical connection is considered in 2.5Gb / s signal capacity unit, the slave signal processing unit can be easily selected and connected according to the slave signal, and all signals having a connection and branch of 10Gb / s in the slave signal processing unit are easily connected. By processing 2.5Gb / s signal capacity unit without processing, there is an effect that can prevent unnecessary data processing.

Claims (8)

In the data demultiplexing apparatus of the optical transmission system, Receiving means for converting a high speed optical signal received from the outside into an electrical signal and extracting a clock; First demultiplexing means for demultiplexing an electrical signal using a clock received from the receiving means and converting the electrical signal into a low speed signal; Overhead processing means for processing reproduction of frames of the output data of the first demultiplexing means and overhead of multiple sections; Time slot changing means for changing the time slot in units of administration units (AUs) according to a control signal of the output data of the overhead processing means; Output means for retiming and outputting the output data of the timeslot changing means; And Connected to the overhead processing means for monitoring and reproducing and multi-section overhead monitoring; connected to the receiving means for detecting and processing an alarm for an optical reception signal and outputting a monitoring control signal to the outside, and inputting a control signal from the outside Connecting means for receiving and transmitting to the timeslot changing means Data demultiplexing device comprising a. The method of claim 1, The first demultiplexing means, Second demultiplexing means for demultiplexing the received high speed electrical signal using the clock from the receiving means, converting the high speed electrical signal into a low speed parallel signal, and dividing the received clock; And Third demultiplexing means for demultiplexing the parallel signal from the second demultiplexing means, dividing the divided clock from the second demultiplexing unit and transmitting the divided clock to the overhead processing means; Data demultiplexing device comprising a. The method of claim 2, The second demultiplexing means, And a 1:16 demultiplexer for demultiplexing by a simple bit deinterleaving method. The method of claim 2 or 3, The third demultiplexing means, A data demultiplexing apparatus comprising a 1: 8 demultiplexer for demultiplexing by a simple bit deinterleaving method. The method according to claim 1 or 2, The overhead processing means, In the synchronous transfer mode (STM-64) frame, the overhead byte of the reproduction section is processed to detect the frame synchronization signal, and after performing 7-stage descrambling, the overhead byte of the reproduction and multiple sections is processed and transmitted to the access means. And transmitting the information data to the timeslot changing means. The method of claim 5, The time slot changing means, The time slot is changed to a management unit (AU) so that the low speed signal inputted from the demultiplexing means can be combined in 2.5Gb / s signal capacity unit according to the operator's time slot control command inputted through the connection means. Data demultiplexing apparatus, characterized in that. The method of claim 6, The output data of the timeslot changing means is A data demultiplexing apparatus comprising four signals including eight 78 Mb / s signals and one frame synchronizing signal in order to minimize the phase of a signal that varies according to an arrival path. The method of claim 7, wherein The output means, And four data output units configured to retime the output data of the timeslot changing unit to a clock of 78 Gb / s in 2.5 Gb / s signal units.