CN1078967C - Transmission line protection system - Google Patents

Abstract

The invention provides a power transmission line protection system, which has several power transmission lines corresponding to the power transmission lines in the active system and the power transmission lines in the standby system, and can perform protection in the active system in response to the detection results of line faults. The switch between the transmission line and the transmission line in the backup system, and can be compared to the fault detection results of the aforementioned several transmission lines, and the faulty transmission line can be transferred from the transmission line in the active system to the transmission line in the backup system switch. In this way, the protective switching of the transmission line can be implemented only for the faulty transmission line. Therefore, there is no impact on the power transmission lines that have not failed, so that the business services of these power transmission lines can not be interrupted.

Description

Optical Interface Line Protection System

The invention relates to a line protection system of an optical interface, in particular to a technology for switching transmission lines for dual components of a working system (Working) and a backup system (Protection) with several transmission lines.

The original transmission line protection system is shown in Figure 4. As shown in FIG. 4 , the current system component 1 includes a reception terminal 8 , a switch switching detection unit 10 and a main signal output control unit 9 . The receiving side terminal 8 is used in the ATM (Asynchronous Transfer Mode) unit to carry out area overhead (セクションォ-ヘヘツ) to several STM (Synchronous Transfer Mode) signals 2 inputted and included in the payload, indicating (ポインタ), indicating (ポインタ), Various processes such as channel overhead (パスォ-バヘツド) and ATM unit synchronization, etc., and output several payload signals 3 and failure detection signals 4 . The switch switching detection unit 10 is used for inputting a fault detection signal 4 and outputting a switch switching signal 5 . The main signal output control section 9 inputs a plurality of effective load signals 3 from the receiving side terminal 8, and outputs the effective load signal according to the ON/OFF LINE signal 7 input by the main signal output control signal generating section 33 provided in the external component 31. 6.

The structure of the backup system module 21 includes a receiving terminal 28 , a switch switching detection unit 20 and a main signal output control unit 29 . The receiving side terminal 28 is used in the ATM unit to perform various processes such as area overhead, indication, channel overhead, ATM unit synchronization, etc., on the input and included in the effective load of several STM signals 2, and output several effective loads signal 23 and fault detection signal 24. The switch switching detection unit 20 is used for inputting a fault detection signal 24 and outputting a switch switching signal 25 . The main signal output control section 29 inputs several effective load signals 23 from the receiving side terminal 28, and outputs the effective load signal according to the ON/OFF LINE signal 27 input by the main signal output control signal generation section 33 provided in the external component 31. 6.

The structure of the external component 31 includes a main signal output control signal generator 33, the latter is used to input the switch switching signal 5 from the active system component 1, input the switch switching signal 25 from the standby system component 21, and input the switch switching signal 5 from the external component 21. The switching signal 32 is used to output ON/OFF LINE signal 7 to each power transmission line in the active system component 1, and to output ON/OFF LINE signal 27 to each power transmission line of the standby system component 121.

In this structural configuration, each power transmission line can be monitored by using the terminal parts 8, 28 in each component 1, 21 of the active system and the backup system. When a fault (transmission line fault, receiver device fault, etc.) is detected, the switching detection unit 10, 20 will generate a switching signal 5, 25 for all transmission lines according to the fault detection signal 4, 24. The external component 31 generates ON/OFF LINE signals 7, 27 according to the switch switching signals 5, 25, and controls the output of the receiving and measuring main signals of the two systems.

Here, FIG. 5 shows the internal configuration of the main signal output control signal generator 33 . In FIG. 5, the same parts as those in FIG. 4 have been denoted by the same reference numerals. An output control unit 33 - 1 is provided in the main signal output control signal generation unit 33 . This output control section 33-1 receives the switch switching signal 5 of the active system, the switch switching signal 25 of the standby system, and the switch switching signal 32 input from the outside, and outputs ON/OFF LINE corresponding to the potentials of these switching signals. Signal 7, 27. When the signals 7 and 27 are input, the main signal output control parts 9 and 29 will switch between active use and standby for all transmission lines as a whole.

In the above-mentioned original transmission line protection system, when one of the transmission lines in the current system components has a fault such as deterioration of the loop property or is called bad, and when it is to be switched to a backup system, the overall protection of all transmission lines is implemented. protective switching. Therefore, there is a disadvantage that protective switching is also performed on other irrelevant transmission lines, thereby interrupting the service of those transmission lines that do not have a fault.

In Japanese Patent Application Publication No. 2-2261, Japanese Patent Application Publication No. 3-265317 and Japanese Patent Application Publication No. 4-183029, some technologies for switching the transmission line in the active system and the transmission line in the standby system are also disclosed. However, none of the technologies disclosed in these publications solves the above-mentioned shortcomings in the prior art.

The object of the present invention is to provide a power transmission line protection system which can prevent the service interruption of those power lines which do not have a fault when switching the faulty power transmission lines from the active system to the standby system.

A line protection system for an optical interface according to the present invention has: several power transmission lines corresponding to the power transmission lines in the active system and the power transmission lines in the backup system, and can respond to the detection results of line faults Switching between the transmission lines in the system and the transmission lines in the standby system,

The switching control component is used to switch the faulty transmission line from the transmission line in the active system to the transmission line in the backup system according to the fault detection results of the aforementioned several transmission lines.

It is characterized in that the aforementioned switching control assembly includes:

Fault detection is performed on the lines in the aforementioned active system one by one, and the first fault detection component is used to output the signal for switching the faulty transmission line,

Fault detection is performed on the lines in the aforementioned standby system one by one, and a second fault detection component that outputs a signal for switching a faulty power transmission line,

Corresponding to the aforementioned several power transmission lines, switch control for on/off control of the power transmission lines in the active system and the power transmission lines in the standby system according to the switching signals output by the aforementioned first and second fault detection components components.

According to the structure of the present invention, relative to the fault detection results of the aforementioned several transmission lines, the faulty transmission line can be switched from the active system to the backup system.

It is worth pointing out that this transmission line protection system can constantly monitor each transmission line in the active system and the standby system, and can detect whether there are transmission line failures, receiving side device failures and other faults. When it is detected that a line fault has occurred in each power transmission line, a designated switch switching signal for switching the designated switch may be generated. It is also possible to set the threshold value (condition) for switching. Here, the ON/OFF LINE signal for controlling the output of the main signal on the receiving side based on the switch switching signal of the two systems is generated by an external component. This ON/OFF LINE signal can be generated by an externally input line-based forced switching signal, or it can be based on the starting reference for transmission line protection (faults in the transmission path (transmission line) and faults in the receiving side device) produce. By adopting the method of seeding, protective switching can be implemented for the transmission line that reaches the starting reference for transmission line protection.

Fig. 1 is a schematic block diagram showing the structure of a transmission line protection system according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram more specifically showing the structure of the transmission line protection system shown in FIG. 1 .

FIG. 3 is a schematic block diagram showing the internal structure of the main signal output control loop shown in FIG. 2 .

FIG. 4 is a schematic block diagram showing the configuration of a conventional transmission line protection system.

FIG. 5 is a schematic block diagram showing the internal structure of the main signal output control circuit shown in FIG. 4 .

The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the structure of a transmission line protection system according to an embodiment of the present invention. As shown in the figure, the composition of the active system component 101 includes a receiving side main signal termination circuit 111 and a line fault detection circuit 112 . The main signal terminal circuit 111 on the receiving side is used to carry out various processes such as area overhead, indication, path overhead, ATM unit synchronization, etc., to the input and several STM signals 102 included in the payload in the ATM unit, and according to several A main signal output control signal 107 outputs several payload signals 106 and fault detection signals 104 . The line fault detection circuit 112 is used to input the fault detection signal 104 and output the switch switching signal 105 .

The configuration of the backup system component 121 includes a receiving side main signal termination circuit 113 and a line fault detection circuit 114 . The main signal terminal loop 113 on the receiving side is used to carry out various processes such as area overhead, indication, path overhead, ATM unit synchronization, etc. to the input and several STM signals 122 included in the payload in the ATM unit, and according to several A master signal output control signal 127 outputs a number of payload signals 106 and fault detection signals 124 . The line fault detection circuit 112 is used to input a fault detection signal 124 and output a switch switching signal 125 .

The structure of the external component 131 includes a main signal output control circuit 133 on the receiving side, the latter is used to input several switch switching signals 105 from the active system component 101, and several switch switching signals 125 are input from the backup system component 121. Externally input several switching signals 132 in units of power transmission lines, and are used to output the main signal output control signal 107 to each line of the active system component 101, and output the main signal output control signal to each line of the backup system component 121 Signal 127.

In this structural configuration, the line fault detection circuits 112 and 114 can be used to monitor whether there is any fault in each transmission line. When a fault is detected, a switching signal 105, 125 is output to indicate that the faulty line will be switched from the active system to the backup system. Such switch switching signals 105, 125 are input to the receiving-side main signal output control circuit 133 in the external component 131, and the latter outputs signals 107, 127 for switching only the faulty transmission lines.

FIG. 2 is a schematic block diagram showing a more specific structural configuration of the transmission line protection system shown in FIG. 1 . As shown in FIG. 2 , the receiving side main signal terminal circuit 111 of the active system component 101 includes a receiving side terminal 108 and a main signal output control unit 109 . The receiving side terminal 108 is used in the ATM unit to perform various processes such as area overhead, indication, channel overhead, ATM unit synchronization, etc. on the input and included in the payload of several STM signals 102, and output several payloads signal 103 and fault detection signal 104. The main signal output control section 109 is used for inputting several payload signals 103 by the receiving side terminal 108, and according to the ON/ OFF LINE signal 107, output the effective load signal 106 of corresponding line.

The structure of the line fault detection circuit 112 includes a switch switching detection part 10, which is used to input the fault detection signal 104 from the receiving side terminal 108, and output the switch to the main signal output control signal generation part 133 in the external component 131. Toggle signal 105 .

The receiving-side main signal terminal circuit 113 of the backup system module 121 includes a receiving-side terminal 128 and a main-signal output control unit 129 in its configuration. The receiving side terminal 128 is used in the ATM unit to perform various processes such as area overhead, indication, channel overhead, ATM unit synchronization, etc. on the input and included in the payload of several STM signals 122, and output several payloads signal 123 and fault detection signal 124. The main signal output control part 129 is used for inputting several effective load signals 123 by the receiving side terminal 128, and according to the ON/OFF LINE given by the main signal output control signal generation part 133 in the external component 131, taking the line as a unit The signal 127 outputs the payload signal 106 of the corresponding line. The main signal output control unit 109, 129 outputs the main signal for complementation for each power transmission line based on the ON/OFF LINE signal 107, 127.

The structure of the line fault detection circuit 114 includes a switch switching detection part 126 for inputting a fault detection signal 124 from a receiving terminal 128 and outputting a control signal generating part 133 to a main signal disposed in an external component 131. A switch switching signal 125 is output.

The structure of the main signal output control loop 133 in the external component 131 includes a main signal output control signal generator 134, the latter is used to input several switch switching signals 105 from the switch switching detection loop 110 of the active system component 111, A number of switch switching signals 125 are input from the switch switching detection circuit 126 of the standby system component 121, and a number of switch switching signals 132 are input from the outside in units of lines, and are used to output to each transmission line in the active system component 101 ON/OFF LINE signal 107, output ON/OFF LINE signal 127 to each line in the backup system component 121.

Here, the internal structure of the main signal output control loop is shown in Figure 3. Output control units 134 - 1 to 134 -N corresponding to the respective power transmission lines are provided in the main signal output control signal generation unit 134 . In other words, the number of lines here is N, so output control units 134-1 to 134-N corresponding to the respective power transmission lines are provided.

The switch switching signal 105 for outputting the failure detection response of the first line in the active system module 101 is input to the output control unit 134-1. Furthermore, a switch switching signal 125 for outputting a failure detection response of the first line in the backup system module 121 is also input to the output control unit 134-1. The switch switching signal 132 is also externally input to the output control unit 134-1.

Similarly, the switch switching signal 105 for outputting the fault detection response of the Nth line of the active system component 101 is input to the output control part 134-N. A switch switching signal 125 for outputting a failure detection response of the Nth line in the backup system module 121 is input to the output control unit 134-N. Furthermore, the switch switching signal 132 is also input from the outside to the output control unit 134-N.

These output control units 134-1 to 134-N output ON/OFF LINE signals 107, 127 for switching only the faulty transmission lines in response to the corresponding line fault detection results. That is to say, in the original system, once one of several lines fails, all the lines will be switched from the active system to the standby system, but in this system, only this transmission line can be switched to the active system to the backup system. By adopting such a structural configuration, no impact will be exerted on the power transmission lines without faults, and thus the business services of these power transmission lines will not be interrupted.

More importantly, this system is a transmission line protection system that is equipped with an active system and a backup system for several transmission lines, and can switch between the active system and the backup system in response to the fault detection of these transmission lines, so it can Switching between the active system and the standby system is performed in response to line fault detection results corresponding to a plurality of transmission lines.

Various well-known detection methods can be used to detect line faults. For example, when the data logical value determined by the corresponding transmission line signal is a specific value or characteristic value (all "1" or all "0"), it can be judged that the transmission line has a fault. It can also be judged that a fault has occurred when the data value determined by the corresponding transmission line signal is a well-known error detection symbol, that is, an error signal for Cyclic Redundancy Check (CRC) and parity check.

Moreover, in the event that there is no failure, in order to perform operations such as maintenance and testing, an external input switch can also be used to switch signals to switch the required transmission line from the active system to the standby system.

In the above-mentioned embodiment, the fault detection signal 104, 124 is outputted from the receiving side main signal terminal circuit 111, 113 to the line fault detection circuit 112, 114 as an example for illustration, but it is also possible to output the fault detection signal 104, 124 to the line fault detection circuit 112, 114 outputs the monitoring data of each transmission line to detect a faulty transmission line.

On the contrary, the line fault detection circuits 112, 114 can also be installed in the main signal terminal circuits 111, 113 on the receiving side, and the main signal terminal circuits 111, 113 on the receiving side can directly output the switching signal to the main signal output control circuit 133 105, 125. When using the main signal terminal circuits 111 and 113 on the receiving side to perform fault detection and switching output on the corresponding transmission lines, the line fault detection circuits 112 and 114 can also be omitted.

As mentioned above, the present invention can perform fault detection and switching between the active system and the backup system in units of lines, so for the dual components of the active system and the backup system with several transmission lines, it is possible to generate a fault by only The way of protective switching of transmission lines does not have any impact on the transmission lines that do not have faults, so that these transmission lines can be used for business services without interruption.

Claims (5)

1. the route protection system of an optical interface; have: with transmission line (102) in the current use system and corresponding some the transmission lines of transmission line (122) in the back-up system; and testing result that can the response line fault is carried out transmission line in the current use system and the switching between the transmission line in the back-up system

Switching controls assembly (111～114,133) with the fault detect result with respect to aforesaid some transmission lines, carries out switching by the transmission line of the transmission line in the current use system to the back-up system to producing out of order transmission line.

It is characterized in that aforesaid switching controls assembly includes:

To the circuit in the aforementioned current use system one by one carry out fault detect, and output switches the first fault detect assembly (111,112) that the signal that produces out of order transmission line is used,

To the circuit in the aforementioned back-up system one by one carry out fault detect, and output switches the second fault detect assembly (113,114) that the signal that produces out of order transmission line is used,

With switch control assembly (133) aforesaid some the corresponding settings of transmission line, that according to the switching signal of the aforementioned first and second fault detect assemblies output transmission line in the aforementioned current use system and the transmission line in the back-up system are carried out on/off control.

2. the route protection system of an optical interface as claimed in claim 1; it is characterized in that; the aforementioned first and second fault detect assemblies have no abnormal according to the signal on the corresponding transmission line, whether produce the drive access fault that comprises in the corresponding transmission line and the fault of receiving system fault and detect.

3. the route protection system of an optical interface as claimed in claim 2; it is characterized in that; when the data value in the signal of the aforementioned first and second fault detect assemblies on being included in corresponding transmission line was specific value, judging to produce in the corresponding transmission line had fault.

4. the route protection system of an optical interface as claimed in claim 2; it is characterized in that; the aforementioned first and second fault detect assemblies are according to the data error detection symbol; when the data in the signal on being included in corresponding transmission line were misdata, judging to produce in the corresponding transmission line had fault.

5. the route protection system of an optical interface as claimed in claim 1 is characterized in that also having:

First signal output control assembly (109), it controls correspondingly with the on/off of aforementioned switches control assembly, and in some the transmission lines each is exported signal on the aforementioned current use system transmission line,

Secondary signal output control assembly (129), it is corresponding with the on/off control of aforementioned switches control assembly, and complementary mutually with the action of aforesaid first signal output control assembly, in some the transmission lines each is exported signal on the aforementioned back-up system transmission line.

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