KR100256689B1 - Add drop multiplexer optical transmission apparatus - Google Patents

Abstract

PURPOSE: An optical transmission apparatus for branching and coupling signal is provided to make it possible to input and output the signal to/from a transmission line, and increase the usability of the transmission line in case that this line has a ring-type line switching structure. CONSTITUTION: A system clock generation part(10) generates a system clock which is synchronized by a reference signal, and supplies a frame synchronization signal. De-multiplex process parts(20,21) convert a received optical signal to an electric signal in order to extract the electric signal and a clock component from the optical signal. The de-multiplex process parts(20,21) perform a de-multiplex operation in response to the received optical signal and a clock signal. Multiplex process parts(30,31) convert the electric signal received to an optical signal, and multiplex a received parallel signal in order to output the optical signal. A subordinate signal process part(40) receives and transmits optical signals according to the system clock and the synchronization signal. A branch connection control part(50) controls a branch connection operation in response to the system clock and the synchronization signal.

Description

Optical transmission device for branch coupling

The present invention relates to a technique for matching synchronous signals, multiplexing them into optical signals, and optically transmitting the signals. In particular, the present invention processes the received signals, and has east and west switching, east / west direct connection, and branching and combining of local signals. In addition, the present invention relates to an optical transmission device for branch coupling having a self-recovery function to secure a protection channel and improve channel switching routing to improve reliability of transmission paths in linear and annular networks.

Conventional single-station optical transmission device does not have a function of branching or adding a new signal at an intermediate node of a line, so signals input to a 10Gb / s transmission device should be separated into slave signals only at the receiving station. The problem is that the transmission rate is separated and retransmitted into a 10Gb / s signal, which degrades the transmission quality and increases the transmission cost. In addition, since the addition and branching of the signal cannot be performed at the intermediate node, the signal and the branching cannot be performed at the 10Gb / s optical transmission device at the intermediate node of the transmission path. Therefore, the signal is not removed at the 10Gb / s optical transmission device at the intermediate node of the transmission path. There has been a problem in that it is impossible to add or add to the service, which degrades the usability of the 10Gb / s optical transmission device.

Accordingly, the present invention has been made to solve the above problems, the optical signal transmission and reception of the optical signal of a predetermined speed by receiving the synchronous signal and multiplexed into a specific signal, branching, combining and routing of the signal as a function of the intermediate node of the transmission line The purpose of the present invention is to provide an optical transmission device for branch coupling that can perform signal input / output of a transmission line and increase the usability of the line when operating as an annular line switching structure.

1 is a block diagram of an embodiment of an optical transmission device for branch coupling according to the present invention;

FIG. 2 is a block diagram of an embodiment of the system clock generator of FIG. 1; FIG.

3 is an exemplary diagram illustrating branching, combining, and passing patterns of signals in the optical transmission device for branch coupling of FIG.

4 is an explanatory diagram of a general two-wire bidirectional line transfer ring branch coupling multiple device in which the optical transmission device for branch coupling of FIG. 1 is actually used;

Explanation of symbols on the main parts of the drawings

10: system clock generator

20, 21: West and east STM-64 demultiplex processor

30, 31: West and east STM-64 multiprocessor

40: slave signal processing unit

50: branch coupling control unit

60: network management unit

70: system monitoring and control

In accordance with another aspect of the present invention, there is provided a branch coupling optical transmission device comprising: system clock generation means for generating a system clock synchronized with a reference signal received from the outside and providing the system clock with a frame synchronization signal; Demultiplex processing means for photoelectric conversion of the received optical signal to extract electrical signals and clock components, and demultiplexing using the received optical signal and clock; A multi-processing means for receiving and converting an electric signal and multiplexing a parallel signal of a predetermined speed to output an optical signal; Dependent signal processing means for transmitting and receiving a plurality of optical signals by performing a connection function according to the system clock and frame synchronization signal; And branch combining control means for matching with the dependent signal processing means, the demultiplex processing means, the multiple processing means, and the like through a signal connection, and controlling the branch coupling according to the system clock and frame synchronization signal.

In addition, the optical transmission device for branch coupling of the present invention, network management means for creating and outputting data for the performance and history management of the entire system; And system monitoring and control means for monitoring the alarm, operation status and performance of the means to perform the switching and control, and reporting the result to the network management means.

Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 to 3.

Referring to FIG. 1, the optical transmission apparatus for branch coupling according to the present invention includes a system clock generator 10, a western STM-64 reverse synchronization processor 20, and an east STM-64 station. Multiple processing unit 21, west STM-64 multiple processing unit 30, east STM-64 multiple processing unit 31, dependent signal processing unit 40, branch combining control unit 50, network management unit 60 And a system monitoring and control unit 70.

The system clock generator 10 receives a reference signal from an external clock source, generates a clock synchronized thereto, and distributes and supplies the same with the frame synchronization signal FS of 8 kHz to the entire system.

FIG. 2 is a block diagram of an exemplary embodiment of the system clock generator of FIG. 1.

As shown in FIG. 2, the system clock generator of FIG. 1 includes a reference clock selector 23, a reference clock monitor and control unit 24, a synchronous clock generator 25, and a system clock output unit 26. ) And a system clock output control unit 27.

The operation of the system clock generator of FIG. 1 having the structure as described above will now be described.

The reference clock selector 23 uses a 2048kb / s signal from the outside and the line signals of the received STM-64, STM-16, STM-4, and STM-1 as input reference clocks, and the reference clock is selected by the system. The reference clock is selected from the input reference clocks selected at the initial setting of the system under the control of the monitoring and control unit 70.

The reference clock monitoring and control unit 24 monitors whether the primary reference clock has failed and repairs a failure and reports the system monitoring and control unit 70.

The Synchronous Equipment Timing Generator (SETG) 25 generates a clock synchronized with the input reference clock using a digital processor-phase synchronization loop.

The system clock output unit 26 generates 51/78/38 MHz clock and frame signals required for the system from the 155.520 MHz clock generated from the synchronous clock generator.

The system clock output controller 27 controls the output of the system clock in order to realize redundancy in preparation for a failure of the system clock generator 10.

The West family STM-64 demultiplexer 20 receives a 10Gb / s optical signal and performs photoelectric conversion, and extracts the 10Gb / s electrical signal and clock component from the optical receiver 20 (ORX) 20-1. The STM-64 demultiplexer 20-2 demultiplexes using the received 10Gb / s signal and a clock, and the first time slot exchanger receives a plurality of 78Mb / s parallel signals and exchanges internal data positions. (TSI: Time Slot Interchange) 20-3.

The optical receiver 20-1 converts the received 10Gb / s optical signal into an electrical signal, recovers the clock using the converted signal, and latches the signal in the recovered clock to STM- the 10Gb / s signal and the 10GHz clock. 64 provided to the demultiplexer 20-2, and outputs an Loss Of Signal (LOS) signal indicating that there is no input optical signal when no optical signal is received.

The STM-64 demultiplexer 20-2 receives the STM-64 signal and the extracted 10 GHz clock and demultiplexes 1:16 to a plurality of 622 Mb / s and reframes and descrambles the plurality of 622 Mb / s signals. And transfers a plurality of 78 Mb / s signals obtained by 1: 8 demultiplexing to the first time slot exchanger 20-3, and also a Regenerator Section Overhead (RSOH) in an STM-64 frame. ) And multiplex section overhead (MSOH) information is detected and processed.

The first time slot exchanger 20-3 receives a plurality of 78 Mb / s signals, exchanges the positions of the time slots of the internal data with the required positions in the branch combining controller 50, and then converts the time slots of the internal data into clock and frame synchronization signals. Together with the branch coupling control unit 50.

In addition, the east STM-64 demultiplexer 21 is located on the opposite side of the west STM-64 demultiplexer 20 around the branch coupling controller 50, and the west STM-64 demultiplexer 20 is located. Has the same operation and configuration. At this time, the east STM-64 demultiplexer 21, like the west STM-64 demultiplexer 20, is an optical receiver, an STM-64 demultiplexer, and a second time slot exchanger 21-1, 21-. 2, 21-3).

The west STM-64 multi-processing unit 30 receives the 10Gb / s electric signal and converts the optical transmitter 30-1 into an all-optical conversion, and the STM-64 outputting the STM-64 signal by multiplexing the received parallel signals of 78 Mb / s. A 64 multiplexer 30-2 and a third time slot exchanger 30-3 for receiving a plurality of 78 Mb / s parallel signals from the branch coupling controller 50 and exchanging positions of internal data are provided.

The optical transmitter 30-1 converts the 10Gb / s electrical signal received from the STM-64 multiplexer 30-2 into an optical signal and transmits the optical signal.

The STM-64 multiplexer 30-2 is a block for performing STM-64 multiplexing and multiplexes a plurality of 78Mb / s signals received from the third time slot exchanger 30-3 into 10Gb / s signals. Performs MSOH and RSOH insertions for 64 signals, first multiplexes multiple 78Mb / s signals to produce 8:16 multiplexed 622Mb / s signals, and 16: 1 multiplexes these 622Mb / s signals to 10Gb / s Function to generate a signal.

The third time slot exchanger 30-3 receives a plurality of 78 Mb / s signals from the branch combining controller 50, exchanges positions of time slots of internal data, and then converts them to STM-64 multiplexer 30-2. To provide.

In addition, the east STM-64 multi-processing unit 31 is located on the opposite side of the west STM-64 multi-processing unit 30 with respect to the branch coupling control unit 50, and the same operation as the west STM-64 multi-processing unit 30 and Has a configuration. At this time, the east STM-64 multiplexer 31, like the west STM-64 multiplexer 30, is an optical transmitter, an STM-64 multiplexer, and a fourth time slot exchanger 31-1, 31-2, 31. -3).

The slave signal processor 40 may include an STM-1 connector, an STM-4 connector, and an STM-16 connector 41, 42 that perform slave signal processing to transmit and receive STM-1, STM-4, and STM-16 optical signals. 43 and a subordinate signal connection section 44 for connecting the subordinate signals to the branch coupling control section 50.

The STM-1 connection unit 41 receives the 155Mb / s optical signal of the STM-1 hierarchy, recovers the clock and the signal, converts it into a plurality of 52Mb / s signal sequences, and transmits the signal to the slave signal connection unit 44. It receives a 52Mb / s signal from (44) and converts it to a 155Mb / s optical signal of the STM-1 level to output.

The STM-4 connector 42 receives 622Mb / s optical signals of the STM-4 hierarchy, recovers clocks and signals, converts them into a plurality of 52Mb / s signal sequences, and transmits them to the slave signal connector 44. It receives a 52Mb / s signal from (44) and converts it to a 622Mb / s optical signal of the STM-4 hierarchy and outputs.

The STM-16 connection unit 43 receives the 2.5Gb / s optical signal of the STM-16 hierarchy, recovers the clock and the signal, converts the signal into a plurality of 52Mb / s signal sequences, and transmits the signal to the slave signal connection unit 44. It receives a 52Mb / s signal from the connection unit 44 and converts it to 2.5Gb / s optical signal of the STM-16 hierarchy to perform the function of outputting.

The slave signal connection unit 44 receives the 622 Mb / s electrical signal from the branch coupling controller 50 to perform reframe, demultiplexing, and descrambling, respectively, and then converts the signal into a 52 Mb / s signal, a 52 MHz clock, and an 8 KHz frame signal. To the STM-1 connection, STM-4 connection and STM-16 connection 41, 42, 43, and vice versa from the STM-1 connection, STM-4 connection and STM-16 connection 41, 42, 43 Receives 52Mb / s signal and 52MHz clock and 8KHz frame signal, processes the pointer, inserts A1 and A2 bytes, scrambles for 622Mb / s transmission, and multiplexes to 622Mb / s to transmit to branch combining controller 50 Play a role.

The branch coupling control section 50 is an STM-64 multiprocessor, a western STM-64 demultiplexer, an east STM-64 demultiplexer, a western STM-64 multiprocessor, an east STM-64 multiprocessor, and a slave in a 10 Gb / s optical transmission system. It is connected to the signal processing unit 20, 21, 30, 31, 40, and is made through the signal connection of 622Mb / s when matching with the dependent signal processing unit 40. The branch combining control unit 50 has four H-buses each having eight 78 Mb / s signals, one frame synchronizing signal (FS), and one 78 MHz clock as four units corresponding to 2.5 Gb / s capacity. It is received from the STM-64 demultiplex processor 20, 21 and synchronized with the system reference clock by pointer processing. As such, when a signal synchronized with the system reference clock and a signal coupled from the dependent signal processor 40 are input, the branch combining controller 50 performs spatial division switching under the control of the system monitoring and the controller 70. As such, the signal in which the spatial division switching is performed is divided and transmitted to the west and east STM-64 multiprocessing units 30 and 31 and the subordinate signal processing unit 40.

The branch combining control unit 50 performs a pointer processing on the 78 Mb / s signals received from the STM-64 demultiplexing units 20 and 21, respectively, and transmits the first and second pointer processing units 51 and 52 in synchronization with the system reference clock. ) And the H-bus signals from the West and East STM-64 demultiplexing units 20 and 21, respectively, and the H-bus signals from the slave signal processing unit 40, and are controlled by the system monitoring and control unit 70. A branch combiner 53 for performing a function of branching, combining, or passing the signal, and providing the signal to the west and east STM-64 multiprocessing units 30 and 31 and the subordinate signal processing unit 40, and the subordinate signal processing unit. And a plurality of 622 Mb / s electrical signals from the slave signal processor 40 to perform reframe, demultiplexing, and descrambling, respectively. Multiple 78 Mb / s data, 78 MHz clock, and 8 KHz frame sync signal It converts into a plurality of H-bus signals and transmits them to the branch coupling unit 53. On the contrary, a plurality of H-bus signals are received from the branch coupling unit 53, and A1 and A2 bytes are inserted and 622Mb / s. After the scrambling for transmission, and comprises a high-speed signal connection 54 for multiplexing to 622Mb / s to transmit to the dependent signal processing unit 40.

Referring to the operation of the branch coupling optical transmission device according to the present invention having the structure as described above in detail.

First, a process of converting an inputted dependent signal into an STM-64 signal and outputting the same will be described.

STM-1, STM-4, and STM-16 connections (41, 42, 43) receive STM-1, STM-4, STM-16 optical signals, recover clocks and signals, and convert them into 52 Mb / s signal sequences To the slave signal connection unit 44.

The slave signal connection section 44 processes the 52 Mb / s signal, the 52 MHz clock, and the 8 KHz pulse frame received from the STM-1 connection, the STM-4 connection, and the STM-16 connection (41, 42, 43) to 78 Mb / s. After the conversion, A1 and A2 bytes are inserted, scrambled, and multiplexed at 622 Mb / s to be transmitted to the high speed signal connection unit 54.

The high speed signal connection unit 54 receives 16 622 Mb / s electrical signals from the slave signal processing unit 44 to reframe and descrambles the eightteen 78 Mb / s signals of 16 bundles, and then descrambles the 78 Mb / s signals 8 It is converted into 16 H-bus signals consisting of a number of 78 MHz clocks and 8 KHz frame pulses, and transferred to the branch combiner 53.

The branch coupling unit 53 transmits the signal having the branch coupling to the west STM-64 multiprocessor 30 or the east STM-64 multiprocessor 31 through the backplane.

The west STM-64 multiprocessor 20 or east STM-64 multiprocessor 20 (east) receives a number of 78 Mb / received from the third time slot switch 30-3 or the third time slot switch 31-3. s Compensates for the phase difference occurring between signals and exchanges the time slots of the signals to meet the needs of the target, and then generates B2 bytes in the STM-64 multiplexer 30-2, 31-2 to generate the multi-section overhead (MSOH). ), Serial communication channel processing using E2 byte of multi-section overhead (MSOH) byte, parallel communication channel processing using data bus with supervisory control device through K1, K2, S1 and M1 byte, Generates B1 bytes and inserts them into the relay section overhead (RSOH), inserts A1 and A2 frame bytes among the relay section overhead (RSOH) bytes, and processes multiple 78 Mb / s signals after processing J0 / C1 bytes (10 Gb / s) Multiplexes to 622Mb / s signals and then 16: 1 multiplexes 16 622Mb / s signals again. Synthesizing the STM-64 electrical signals, and outputs it to the optical transmitter 30-1 and 30-2. The optical transmitters 30-1 and 30-2 convert the STM-64 electrical signals into optical signals and output the optical signals.

Next, a process of branching from the 10Gb / s optical signal will be described.

The optical signals received through the optical receivers 20-1 and 21-1 are converted into electrical signals to extract signals and clocks, and the extracted 10Gb / s signals and clocks are converted into the STM-64 demultiplexer 20-2. 21-2).

The STM-64 demultiplexer (20-2, 21-2) receives 10Gb / s and 10GHz clock signals, performs 1:16 demultiplexing to descramble 16 622Mb / s and 622MHz clocks, and 1: 8 demultiplexes. A plurality of 78Mb / s signals are transmitted to the first and second time slot exchangers 20-3 and 21-3. At this time, A1 and A2 bytes are detected and reframed in the received signal, B1 calculation is performed on the received signal, and the error is detected in the relay section by comparing with the received B1 byte. The first and second tie slot exchangers 20-3 and 21-3 receive a plurality of 78 Mb / s signals, exchange time slots for internal signals, and provide them to the branch combining controller 50.

The pointer processing units 51 and 52 perform synchronization adaptation to the system clock by pointer processing on signals received from the first and second time slot exchangers 20-3 and 21-3. The unit 53 branches this signal, and the branched signal is provided to the high speed signal connection unit 54, and the high speed signal connection unit 54 is composed of eight 78 Mb / s data, a 78 MHz clock, and an 8 KHz frame pulse. 16 bus signals are received, A1 and A2 bytes are inserted, scrambled to transmit the 622Mb / s signal, and then multiplexed to the 622Mb / s signal to be transmitted to the slave signal connection unit 44.

The slave signal connector 44 receives and reframes the 622 Mb / s electrical signal, demultiplexes the signal to 8 78 Mb / s, descrambles it, converts it into 12 52 Mb / s signals, a 52 MHz clock, and an 8 KHz frame pulse, and backplanes. The STM-1 connection, the STM-4 connection, and the STM-16 connection 41, 42, and 43 are transmitted through the STM-1 connection.

The STM-1 connection, STM-4 connection and STM-16 connection 41, 42, 43 convert the received 52Mb / s signal into the corresponding STM-1, STM-4, STM-16 level signal and then convert it into an optical signal. Convert and send.

In addition, the system clock generator 10 provides a system clock and a frame synchronization signal required for each function block. As a reference signal for synchronization, an external 2Mb / s reference signal or a west STM-64 demultiplex processor 20 ), The 8 kHz clock received from the east STM-64 demultiplexer 21, the STM-1 connector 41, the STM-4 connector 42 and the STM-16 connector 43 is used.

On the other hand, the system monitoring and control unit 70 performs the switching and control by monitoring the operating state, performance, and alarm of each functional block in the entire process described above, and reports it to the network management unit 60. Subsequently, the network manager 60 creates and outputs data for performance and history management of the entire apparatus.

3 is a conceptual diagram illustrating branching, combining, and passing of a signal according to the present invention. Referring to FIG. 3, the operation of the branch-coupling optical transmission device according to the present invention will be described below.

As shown in FIG. 3, some of the 10Gbs signals received from the west STM-64 demultiplexer 20 are passed through the branch coupling controller 50 to the east STM-64 multiprocessor 31 and some other signals are passed. It is branched to the dependent signal processor 40. In addition, some of the 10Gb / s signals received from the east STM-64 demultiplex processor 21 are passed through the branch coupling controller 50 to the west STM-64 multiprocessor 30, and some of the other signals are dependent signal processors ( Branch to 40). In addition, the STM-64 (10Gb / s) signal multiplexed by the east STM-64 multiplexer 31 is coupled to the main signal from the slave signal processor 40 and the signal passed from the west STM-64 demultiplexer 20. It is made by multiplexing the transmitted signal. In addition, the STM-64 (10Gb / s) signal multiplexed in the western STM-64 multiplexer 30 is coupled to the main signal from the slave signal processor 40 and the signal passed from the east STM-64 demultiplexer 20. It is made by multiplexing the transmitted signal. The branch combining and passing control is performed by the branch combining control unit 50 under the control of the system monitoring and the control unit 70.

The function of the branch coupling controller 50 will be described in more detail as follows.

The branch coupling controller 50 is a 2.5Gb / s signal received from the west STM-64 demultiplexer 20, a 2.5Gb / s signal and a subordinate processor 40 received from the west STM-64 demultiplexer 21. 2.5Gb / s received from a total of 7.5Gb / s capacity. Therefore, in order to process 10Gb / s signals from the west STM-64 demultiplexer 20, the east STM-64 demultiplexer 21, and the slave signal processor 40, four branch coupling controllers as shown in FIG. Will be needed. The 2.5Gb / s capacity signal, which is a part of the STM-64 demultiplexed signal received from the west, is received in four units of 622Mb / s, and is synchronized with the reference clock of the 10Gbps transmission system through the pointer processor 51. , 2.5Gb / s of signals, which are input to the branch coupling unit 53 and part of the demultiplexed signals of the STM-64 received from the east, are received in four units of 622Mb / s and received through the pointer processing unit 53. After the synchronization process is performed to the reference clock of the 10Gbps transmission system, it is input to the branch combiner 53. In addition, the 2.5Gb / s capacity signals transmitted from the slave signal processor 40 are also received in four units of 622Mb / s and input to the branch combiner 53. Thus, the total 7.5Gb / s-class signals received from the western STM-64 demultiplexer 20, the east STM-64 demultiplexer 21, and the slave signal processor 40 are diverged by a branch coupling unit ( 53). The branch combiner 53 performs functions such as passing signal processing to the east and west, combining the dependent signal and branching to the dependent signal. First, the western 2.5 Gbps capacity signal consists of 48 VC-3 (virtual container-3: 51.84 Mb / s) signals. It is also composed of 48 VC-3s (51.84 Mb / s), and is controlled by external control to divert westward and subordinate. In addition, the signal input to the branch coupling unit 53 to be coupled from the subordinate signal processing unit 40 is coupled to the east or west according to the external control command. In this way, the signal of the branch combining and passing through the branch combining control unit 50 is transmitted to the west STM-64 multiple processing unit 30, the east STM-64 multiple processing unit 31, and the dependent signal processing unit 40, respectively.

Looking at the network configuration where a typical 10 Gb / s optical transmission device is used, a large number of terminal multiplex (TM), linear-add / drop multiplexer (L-ADM), and two-wire bidirectional line transfer branching are shown. It is operated as a multiple device (BLSR / 2-ADM: 2 fiber Bidirectional Line Switching Ring-ADM).

The optical transmission device for branch coupling according to the present invention can support the above three types of network configurations by a simple control command from the outside, which will be described in detail below.

First, in the case of a single station multiplexing device, only one of the west and the east is used, and all of the received STM-64 signals without a signal passing through the branch coupling control unit 50 branch to the slave signal processing unit 40, and conversely, the slave signal processing unit. The branch combining control unit 50 may be controlled to combine all the signals transmitted from the 40 to multiplex the STM-64 signal. Second, in the case of the linear branch combining multiplexing device, the branching control section 50 passes a portion of the signal received from the western power and the signal received from the east power to the subordinate processing unit, and vice versa. The branch combining control unit 50 may be controlled so as to be multiplexed with the signal to be transmitted to the western and eastern powers.

Lastly, the two-wire bidirectional line transfer ring branch coupling multiplexing device is shown in FIG. 3. Referring to FIG. 3, the transfer path transfer during the optical path cutting will be described below.

In normal operation, half of the capacity is used as a use band (solid line in FIG. 4) and the remaining capacity is left as a guard band (dashed line in FIG. 4) for switching.

As shown in FIG. 4, when bidirectional switching is performed over the west line as in the 10G transmission device B 82, the used band signal to be output through the western transmitter is switched to the guard band of the east transmitter and the guard band of the east receiver. The branch combining control unit 50 may be controlled so that the signal is transferred to the operating band of the east transmitter. Referring to this operation method in detail with reference to FIG. 1, the 2.5 Gbps capacity signal input through the west receiver is actually 1.2 Gbps because only half of the capacity is actually used in the 2-wire bidirectional line transfer ring branch coupling multiplexing device. The corresponding signal becomes a valid transmission signal. In addition, in the case of the 2-Gbps bidirectional line switching ring branch coupling multiple device, the signal of 1.2 Gbps becomes a valid transmission signal because only half of the capacity is actually used in the case of the 2.5 Gbps capacity input through the east receiver. In addition, the signals received from the west and the east are outside the valid band, that is, the west 1.2Gbps and the east 1.2Gbps signals are left as guard bands for use when bidirectional switching is performed over the line. If the two-way transfer is made beyond the west line, the transmission to the west is impossible, so the effective signal corresponding to 1.2 Gbps to be transmitted to the west is simply routed to the guard band of the east transmission by external control. In addition, due to the abnormality of the west line, bilateral switching is also performed in the western powers. Therefore, the received signal from the west is divided into the guard bands of the 10G transmitter A, the 10G transmitter D, and the 10G transmitter C (81, 84, 83). Through the eastern guard band. Therefore, the received signal from the western power is a signal received in the eastern guard band at the time of bidirectional switching over the western track.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the branch coupling optical transmission device of the present invention integrates STM-1, STM-4, and STM-16, which are used in an existing optical transmission network, into a single transmission path to provide a transmission capacity of 10 Gb / It can be extended up to s, and it can be inserted into the middle node of the transmission network to perform signal combining, branching, and passing functions, enabling the input and output of signals on the transmission line, and increasing the survivability of traffic when operating as an annular line switching structure. . With simple external control commands, the device can also be used as a linear branch coupling multiple device, an annular branch coupling multiple device, or a single station multiple device, enabling a variety of operations. It is designed to be used for any combination of STM-1, STM-4, and STM-16 signals, which are dependent signals, and has high utilization and economical structure. It has an easy advantage. In addition, the technical field and related business fields used in the present invention also have a ripple effect such as introduction of services of various transmission capacities and reduction of transmission cost of users due to the increase in transmission speed and wide operability.

Claims (9)

System clock generation means for generating a system clock synchronized with a reference signal received from the outside and providing the system clock with a frame synchronization signal; Demultiplex processing means for photoelectric conversion of the received optical signal to extract electrical signals and clock components, and demultiplexing using the received optical signal and clock; A multi-processing means for receiving and converting an electric signal and multiplexing a parallel signal of a predetermined speed to output an optical signal; Dependent signal processing means for transmitting and receiving a plurality of optical signals by performing a connection function according to the system clock and frame synchronization signal; And Branch combining control means for matching with the dependent signal processing means, demultiplex processing means and multiple processing means through a signal connection, and controlling branch coupling according to the system clock and frame synchronization signal. Branch transmission optical transmission device having a. The method of claim 1, The system clock generating means, Reference clock selecting means for selecting a reference clock among the input reference clocks selected at the time of initial setting of the system; Reference clock monitoring and control means for monitoring and reporting whether a primary reference clock has failed and repairing a failure; Synchronous clock generating means for generating a clock synchronized with the input reference clock; System clock output means for distributing clock and frame signals necessary for the system from the clock received from the synchronous clock generating means; And System clock output control means for controlling the output of the system clock in order to achieve redundancy in case of failure of the system clock output means Branch coupling optical transmission device comprising a. The method of claim 1, The demultiplex processing means, First and second demultiplex processing means positioned opposite to each other with respect to the branch coupling control means; Branch coupling optical transmission device comprising a. The method of claim 3, wherein The first and second demultiplex processing means, Optical reception means for photoelectric conversion of the received optical signal to extract an electrical signal and a clock component; Demultiplexing means for demultiplexing using a received optical signal and a clock; And First time slot exchange means for receiving a plurality of parallel signals to exchange internal data positions Branch coupling optical transmission device comprising a each. The method of claim 1, The multi-processing means, First and second multi-processing means located opposite each other with respect to the branch coupling control means; Branch coupling optical transmission device comprising a. The method of claim 5, The first and second multi-processing means, Optical transmission means for totally converting and receiving the received electrical signal; Multiplexing means for multiplexing the received parallel signals to output an optical signal; And Time slot exchange means for receiving a plurality of parallel signals from the branch coupling control means and exchanging positions of internal data. Branch coupling optical transmission device comprising a each. The method of claim 1, The dependent signal processing means, First to third connecting means for processing the dependent signal to transmit and receive a plurality of optical signals; And Receives an electrical signal from the branch coupling control means, converts it into a clock and frame signal, transmits the signal to the first to third connecting means, and receives the clock and frame signals from the first to third connecting means. Subordinate signal access means for multiplexing and then transmitting to the branch combining control means Branch coupling optical transmission device comprising a. The method of claim 1, The branch coupling control means, First and second pointer processing means for pointer-processing the optical signal received from the demultiplex processing means and transmitting in synchronization with a system reference clock; Branch combining means for receiving a bus signal from the demultiplex processing means and a bus signal from the dependent signal processing means to branch, combine or pass the signal; A connection between the slave signal processing means and the branch coupling means, converts a plurality of electrical signals received from the slave signal processing means into a plurality of bus signals, and transmits the signals to the branch coupling means, and also received from the branch coupling means. High speed signal connection means for multiplexing a plurality of bus signals and transmitting them to the dependent signal processing means Branch coupling optical transmission device comprising a. The method of claim 1, Network management means for creating and outputting data for performance and history management of the entire system; And System monitoring and control means for monitoring the alarm, operation status and performance of the means to perform the switching and control, and report the result to the network management means Branch coupling optical transmission device further comprising.

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