KR100275518B1 - Signal process apparatus of optical transmission system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a signal processing apparatus of an optical transmission system.

2. The problem to be solved by the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a signal processing apparatus capable of remarkably improving the signal branch combining speed by eliminating the dependent phase from the dependent signal in the ADM optical transmission system and the frame phase synchronization of the dependent signal and the high speed signal.

3. Summary of Solution to Invention

The present invention provides a frame signal generating means for generating a frame signal; Receiving and demultiplexing means for receiving and demultiplexing a high speed signal; First pointer processing means for synchronizing the output signal of the receiving and demultiplexing means with the reference clock of the local station according to the frame signal; Second pointer processing means for synchronizing the received dependent signal with the reference clock of the own station according to the frame signal; Branch coupled switching means for branching the output signal of the first pointer processing means and for combining and switching the output signal and the dependent signal of the first pointer processing means; And high speed signal multiplexing and transmitting means for multiplexing output signals of the branch-coupled switching means.

4. Important uses of the invention

The present invention is used for ADM type 10Gbps optical transmission system.

Description

Signal processing device of optical transmission system

The present invention relates to a signal processing apparatus in an Add-Drop Multiplexer (ADM) type 10Gbps optical transmission system, and the like, and particularly, a frame of each dependent signal (i.e., a combined signal) and a high-speed signal (i.e., a main signal). The present invention relates to a signal processing apparatus capable of performing branch combining by excluding synchronization.

1 is a block diagram of a typical 10 Gbps optical transmission system, a high speed signal processing unit 110 for processing a 10 Gbps Synchronous Transfer Mode (STM) -64 signal, and a slave signal for processing STM-1, STM-4 and STM-16 signals It consists of a processing unit 120.

The high speed signal processor 110 may include STM-64 signal receivers 111 and 112 for receiving STM-64 signals from directions opposite to each other, and an STM-64 signal transmitter for transmitting STM-64 signals from directions opposite to each other. 113 and 114 and the signals received through the STM-64 signal receivers 111 and 112 are branch-coupled and transmitted to the slave signal processor 120 and the STM-64 signal transmitters 113 and 114, and the slave signal processor. It is provided with a branch combining control unit 115 for transmitting a signal transmitted from the 120 to the STM-64 signal transmitters 113 and 114.

The slave signal processor 120 includes an STM-1 signal receiver for receiving an STM-1 signal, an STM-1 signal transmitter for transmitting an STM-1 signal, and an STM-4 signal receiver for receiving an STM-4 signal. And an STM-4 signal transmitter for transmitting the STM-4 signal, an STM-16 receiver 121 for receiving the STM-16 signal, and an STM-16 transmitter 122 for transmitting the STM-16 signal. It is composed. Here, the STM-1 signal receiver, the STM-1 signal transmitter, the STM-4 signal receiver, and the STM-4 signal transmitter are omitted for convenience.

Referring to the operation of a general 10Gbps optical transmission system having such a structure is as follows.

The STM-64 signal receivers 111 and 112 receive a 10 Gbps optical signal from an opposing power station, convert the 10 Gbps optical signal into an electrical signal, demultiplex the converted 10 Gbps signal to a corresponding sub-signal processing unit 120, and transmit it or not branch. Pass through to opponent's power.

In the transmitter of the dependent signal processor 120, for example, the STM-16 signal transmitter 122, an overhead corresponding to the STM-16 signal synchronous transmission scheme is applied to a signal branched from the high speed signal processor 110. After inserting and multiplying, it will output before and after optical conversion.

On the contrary, the receiver of the dependent signal processor 120, for example, the STM-16 signal receiver 121 receives the dependent signal as light and converts it into an electrical signal, demultiplexes the dependent signal, and performs an STM-16 signal overhead. After the processing for the high speed signal processor 110 is transmitted.

In the STM-64 signal transmitters 113 and 114 of the high-speed signal processor 110, the signal transmitted from the slave signal processor 120 and the STM-64 signal receivers 111 and 112 pass through to be coupled to the main signal. An overhead corresponding to a synchronous transmission method is inserted into a signal to be transmitted through the signal and multiplexed before transmission to the other station after optical conversion.

In detail, the high-speed signal processing unit 110 may include some of the 10 Gbps signals received from the STM-64 signal receiving unit 111 through the STM-64 signal transmitting unit 114 and some of the 10 Gbps signals through the subordinate signal processing unit 120. It will be dropped.

In addition, some of the 10 Gbps signals received from the STM-64 signal receiver 112 pass through to the west STM-64 signal transmitter 113 and some branches to the dependent signal processor 120.

In addition, the STM-64 signal multiplexed by the STM-64 signal transmitter 114 is a signal transmitted from the STM-64 signal receiver 111 and a signal transmitted to be coupled to the main signal from the dependent signal processor 120. It is made by multiplexing.

In addition, the STM-64 signal multiplexed by the STM-64 signal transmitter 113 is a signal transmitted from the STM-64 signal receiver 112 and a signal transmitted to be coupled to the main signal from the dependent signal processor 120. Will be created by multiplexing

Therefore, in order to be able to freely control such branch coupling, the branch coupling controller 115 having a switching means for controlling branch coupling in the high speed signal processing unit is used.

2 is a block diagram of a signal processing apparatus of a conventional optical transmission system, and includes a high speed signal processor 210 and a slave signal processor 220.

The high speed signal processor 210 includes an optical receiver and an STM-64 signal demultiplexer 211, a pointer processor 212, a branch coupling switch 213, and an STM-64 signal multiplexer and an optical transmitter 214. And a frame generation and adjustment unit 215.

The slave signal processor 220 includes an STM-1 signal processor, an STM-4 signal processor, and an STM-16 signal processor.

The STM-1 signal processor includes an optical receiver and an STM-1 signal demultiplexer 221, an STM-1 signal pointer processor 222, and an STM-1 signal multiplexer and an optical transmitter 223.

Of course, the STM-4 signal processor and the STM-16 signal processor also have the same configuration as the STM-1 signal processor.

The operation of the signal processing apparatus of the conventional optical transmission system having such a structure will be described in detail as follows.

First, the STM-64 signal from the counterpart station is received and demultiplexed by the optical signal of the high speed signal processing unit 210 and the STM-64 signal demultiplexer 211, and pointer processing for synchronizing with the reference clock used in the local station. Is performed through the pointer processing unit 212.

In addition, the dependent signal processing unit 220 also receives the dependent signals received from the counterpart of the optical reception and STM-1 signal demultiplexer, the optical reception and STM-2 signal demultiplexer, and the optical reception and STM-16 signal inverse. Pointer processing for receiving and demultiplexing through the multiplexing unit and synchronizing with the reference clock also used in the local station is performed through the STM-1 signal pointer processing unit, the STM-4 signal pointer processing unit and the STM-16 signal pointer processing unit.

As such, the STM-1 signal, the STM-4 signal, the STM-16 signal, the STM-64 signal, and the like synchronized with the clock of the local station are branch-coupled switching unit 213 for branch combining and passing as described above. Will be entered.

In this way, the high-speed and dependent signals inputted to the branch combining switching unit 213 are signals synchronized with a clock used in the own station, and are multiplexed into STM-64 signals through the process of combining and passing through branches according to the corresponding branch combining control. It is transmitted to the counterpart station or to the dependent signal processor 220.

Here, the signal arriving at the input of the branch coupling switching unit 213 is a signal synchronized with the clock of the local station or the phase of the frame by the pointer processing in the high speed signal processing unit 210 and the subordinate signal processing unit 220, respectively. Not.

The reason for this is that different STM signal processing devices have already been commercialized, so that the frame output phase after multiplexing and demultiplexing and the frame output phase after pointer processing are different from each other, and the STM-16 signal (155 Mbps) processor Since it is relatively small compared to the processor, the STM-1 overhead processing and the synchronization processing by the pointer processing are performed in one device, so the overhead processing part and the pointer processing part may not be separated.

For this reason, since the relative position of each frame of the dependent signal and the high speed signal is not synchronized due to the characteristics thereof, the branch coupling switching unit 213 must make sure that the frames of the high speed signal and the dependent signal must be branched normally. The phase alignment process is necessary.

The frame generation and adjustment unit 215 in the high speed signal processing unit 210 performs such a frame synchronization function, that is, the frame generation and adjustment unit 215 is a pointer processing unit 212 in the high speed signal processing unit 210. The frame phase of the main signal, which is the STM-64 signal arriving at the branch combining switching unit 213, and the frame phase of the dependent signal arriving at the input of the branch combining switching unit 213 from the dependent signal processing unit may be synchronized with the same phase. The STM-1 signal pointer processor, the STM-4 signal pointer processor, and the STM-16 signal pointer processor in the slave signal processor 220 adjust the positions of the frame signals.

3 is an operation timing diagram of a signal processing apparatus of a conventional optical transmission system, and illustrates in detail a frame position of a dependent signal and a frame position of a high speed signal.

Referring to FIG. 3, first, the reference frame signal for the high speed signal processing unit supplied from the frame generation and adjusting unit 215 of FIG. 2 is equal to ①, and receives ① and the pointer processing unit of the high speed signal processing unit 210. In operation 212, after the synchronization by the pointer processing is performed, the delay is delayed by the pointer processing delay (pp-64), and is then input to the branch coupling switching unit 213 as the STM-64 main signal having the same phase as (2).

In the case of the STM-1 signal processing unit, the STM-1 combined signal to be input from the STM-1 signal pointer processing unit 223 to the branch coupling switching unit 213 in the high speed signal processing unit 220 is supplied to the branch combining switching unit. It should arrive at the same phase as the input STM-64 main signal.

To this end, the frame generation and adjustment unit 215 should appropriately adjust the phase of the reference frame signal for the STM-1 signal processor to be supplied to the STM-1 signal processor 221. In other words, the reference frame signal for the STM-1 signal processor includes a processing delay time required for the slave signal processing of the slave signal processor 120, for example, the STM-1 signal pointer processing delay (pp-1) and the high speed signal processor 210. It should be generated in consideration of the transmission delay (d1) and so on. In the case of the STM-1 signal processing unit, as shown in FIG. 3, the reference frame signal for the STM-1 signal processing unit must be the STM-1 signal pointer processing delay (pp-1) and the transmission delay to the high speed signal processing unit 210 (d1). ), The frame phase of the STM-64 main signal and the STM-1 combined signal inputted to the branch coupling switching unit 213 in the high speed signal processing unit 210 is synchronized at the same position.

As such, since the dependent signal processing units are configured through multiplexing, demultiplexing, and synchronization processes by pointer processing, such frame phase adjustment is performed as shown in FIG. 3 according to the vertical signal processing unit 220. Should be.

However, in the signal processing apparatus of the conventional optical transmission system having the structure as described above, the slave signal in each slave signal processor for frame phase synchronization of the fast signal and the slave signal arriving at the branch coupling switching input terminal for branch coupling. By calculating and measuring the processing delay time and transmission delay time in advance and compensating for that time, the reference frame phase to be supplied to each slave signal processor is adjusted, so that the processing delay time has to be measured for each slave signal processor. In addition, since a system for implementing such a frame phase adjustment must be implemented in the system, the configuration of the system becomes very complicated and the supply phase reference frame phase is fixed to each subordinate part. Therefore, the type of dependent signals cannot be arbitrarily changed. there was.

Accordingly, the present invention has been made to solve the above problems, and in the Add-Drop Multiplexer (ADM) type 10Gbps optical transmission system or the like, adds a slave signal to the 10Gbps main signal or adds the main signal from the main signal. In performing the branch combining function required to drop a desired slave signal, it is unnecessary to adjust the phase of the reference frame to be supplied to each slave by eliminating the frame phase synchronization of the slave signal and the high speed signal. It is an object of the present invention to provide a signal processing apparatus having flexibility in terms of receiving a signal.

1 is a block diagram of a general optical transmission system.

2 is a block diagram of a signal processing apparatus of a conventional optical transmission system.

3 is an operation timing diagram of a signal processing apparatus of a conventional optical transmission system.

Figure 4 is a block diagram of an embodiment of a signal processing apparatus of the optical transmission system according to the present invention.

5 is an operation timing diagram of a signal processing apparatus of the optical transmission system according to the present invention.

Explanation of symbols on the main parts of the drawings

410: high speed signal processing unit 411: frame signal generation unit

412: Receiving and demultiplexing unit 413: First pointer processing unit

414: second pointer processing unit 415: branch coupling switching unit

416: multiplexing and transmitting unit 420: dependent signal processing unit

According to an aspect of the present invention, there is provided a signal processing apparatus for an optical transmission system including dependent signal processing means, comprising: frame signal generating means for generating a frame signal; Receiving and demultiplexing means for receiving and demultiplexing a high speed signal from the outside; First pointer processing means for synchronizing the output signal of the receiving and demultiplexing means with a predetermined reference clock of the local station according to the frame signal; Second pointer processing means for synchronizing the slave signal transmitted from the slave signal processing means to a predetermined reference clock of the local station according to the frame signal; Branch combined switching means for branching the output signal of the first pointer processing means and switching to the dependent signal processing means, and combining and switching the output signal of the first pointer processing means and the dependent signal transmitted from the dependent signal processing means. ; And high speed signal multiplexing and transmitting means for multiplexing signals transmitted and coupled by the branch coupling switching means to transmit a high speed signal to the outside.

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

4 is a configuration diagram of an embodiment of a signal processing apparatus of an optical transmission system according to the present invention.

As shown in FIG. 4, the signal processing apparatus of the optical transmission system of the present invention includes a high speed signal processing unit 410 for processing an STM-64 signal, and a slave for processing STM-1, STM-4, and STM-16 signals. The signal processor 420 is configured.

The high speed signal processor 410 includes a frame signal generator 411 for generating a frame signal, a reception and demultiplexer 412 for receiving and demultiplexing a high speed signal from the outside, and a frame signal generator 411. Frame signal transmitted from the first pointer processor 413 and the frame signal generator 411 to synchronize the output signal of the receiving and demultiplexing unit 412 to the reference clock of the local station according to the frame signal transmitted from Accordingly, the second pointer processor 414 and the output signal of the first pointer processor 413 for synchronizing the slave signal transmitted from the slave signal processor 420 to the reference clock of the local station are divided into the slave signal processor 420. By the branch coupling switching unit 415 and the branch coupling switching unit 415 for switching by combining the output signal of the first pointer processing unit 413 and the dependent signal transmitted from the dependent signal processing unit 420.Multiplexing and transmitting unit 416 for transmitting a high-speed signal to the outside by multiplexing the combined and transmitted signals.

Here, the output signal of the first pointer processing unit 413 and the output signal of the second pointer processing unit 414 are synchronized and transmitted to the branch coupling switching unit 415.

The slave signal processor 420 receives an STM-1 signal and demultiplexes the STM-1 signal, and then delivers the STM-1 signal receiving and demultiplexing unit 421 to the high speed signal processor 410, and multiplexes the STM-1 signal. STM-1 signal multiplexing and transmitting unit 422 for transmitting a signal, and STM-4 signal receiving and demultiplexing unit for receiving and demultiplexing an STM-4 signal and then transmitting the signal to the high speed signal processing unit 410, and STM-4 STM-4 signal multiplexing and transmitting unit for multiplexing the signal and transmitting it to the outside, STM-16 receiving and demultiplexing unit for receiving and demultiplexing the STM-16 signal and delivering the signal to the high speed signal processing unit 410, and STM-16 STM-16 multiplexing and transmitting unit multiplexes the signal and transmits the signal to the high speed signal processor 410. Here, the STM-4 signal receiver and demultiplexer, the STM-4 signal multiplexer and transmitter, the STM-16 signal receiver and demultiplexer, and the STM-16 signal multiplexer and transmitter are omitted for convenience.

Comparing the above-described present invention with the conventional signal processing apparatus of FIG. 2, the dependent signal processor 420 of the present invention does not use each dependent signal pointer processor.

The operation of the signal processing apparatus of the optical transmission system of the present invention having the structure as described above will be described in detail as follows.

A second pointer processor 4146 having the same structure as the first pointer processor 413 used for pointer processing of the STM-64 signal is positioned in front of the signal inputted from the slave signal processor 410 to the branch coupling switcher 415. In this way, the high speed signal (that is, the STM-64 signal) input to the branch coupling switching unit 415 and the dependent signal (that is, the STM-1 signal, STM-) input from the subordinate signal processing unit 420 are configured. (4 signals and STM-16 signals) are not only synchronized to the reference clock of the own station by the same pointer processing, but also have the same pointer processing delay time due to the pointer processing. The frame phases of all dependent signals and high-speed signals input to are automatically synchronized.

In this way, by performing the synchronization process, it is not necessary to supply the frame signal from the high speed signal processing unit 410 to the subordinate signal processing unit 420, and a signal having an arbitrary phase from the subordinate signal processing unit 420 is a high speed signal processing unit. Even if it is inputted to 410, the branch combining function can be normally performed.

As described above, even if the slave signal processing device that is already commercially available is implemented in one device and cannot be separated even by the synchronization process by the overhead processing and the pointer processing, the high speed signal processing unit using the configuration as shown in FIG. In step 410, the pointer processing for the dependent signal is performed once more, thereby enabling the branch combining switching function to be performed without a problem.

5 is an operation timing diagram of the signal processing apparatus of the optical transmission system according to the present invention, which shows in detail the frame position of the dependent signal and the frame position of the high speed signal.

Referring to FIG. 5, the high speed signal input to the branch coupling switching unit 415 of the high speed signal processing unit 410 is delayed by the pointer processing delay of the first pointer processing unit 413 from the reference frame signal 1 and is the same as the frame phase 2). Is entered.

Each subordinate signal input to the branch coupling switching unit 415 of the high speed signal processor 410 is demultiplexed from the received optical signal of the subordinate signal processor 420 and the high speed signal processor in the dependent signal processor 420. Regardless of how delayed the transmission delay is to 410, it is delayed by the processing delay of the second pointer processing unit 414 in the high speed signal processing unit 420 from the reference frame signal 1 and is input in frame phases such as ④, ⑥, and ⑧. . 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, according to the present invention, it is possible to perform branch combining normally without the frame synchronizing function of the high speed signal and the subordinate signal inputted to the branch combining switching unit, thereby processing the high speed signal from each sub signal processing unit to implement the frame synchronizing function. Not only does it need to calculate and measure signal processing delays and transmission delays in advance, but it does not require the implementation of functional elements to perform frame phase adjustment, which greatly simplifies the configuration of the system and reduces the There is an effect that can be selected arbitrarily.

Claims (4)

In the signal processing apparatus of the optical transmission system having a dependent signal processing means, Frame signal generating means for generating a frame signal; Receiving and demultiplexing means for receiving and demultiplexing a high speed signal from the outside; First pointer processing means for synchronizing the output signal of the receiving and demultiplexing means with a predetermined reference clock of the local station according to the frame signal; Second pointer processing means for synchronizing the slave signal transmitted from the slave signal processing means to a predetermined reference clock of the local station according to the frame signal; Branch combined switching means for branching the output signal of the first pointer processing means and switching to the dependent signal processing means, and combining and switching the output signal of the first pointer processing means and the dependent signal transmitted from the dependent signal processing means. ; And High speed signal multiplexing and transmitting means for multiplexing the signals transmitted and coupled by the branch coupling switching means to transmit a high speed signal to the outside Signal processing apparatus of the optical transmission system comprising a. The method of claim 1, And the output signal of the first pointer processing means and the output signal of the second pointer processing means are synchronized and transmitted to the branch coupling switching means. The method of claim 1, The high speed signal, A signal processing device of an optical transmission system, characterized in that the STM (Synchronous Transfer Mode) -64 signal. The method according to any one of claims 1 to 3, The dependent signal is, A signal processing apparatus of an optical transmission system, characterized in that the STM (Synchronous Transfer Mode) -1 signal, STM-4 signal and STM-16 signal.