Pipeline optical cable main and standby core monitoring and switching device and system

Abstract

The utility model provides a kind of pipeline accompanying optical cable main spare fiber core monitoring and switching device and system.The utility model provides a kind of pipeline accompanying optical cable main spare fiber core monitoring and switching device, comprising: first mechanism for separating out fixed wavelength's test light source from the optical signal of in-use main emitting optical fiber, second mechanism for separating out fixed wavelength's test light source from the optical signal of spare emitting optical fiber, first detection mechanism for real-time monitoring in-use main emitting optical fiber performance index, second detection mechanism for real-time monitoring spare emitting optical fiber performance index, first switching mechanism for starting and stopping in-use main emitting optical fiber and second switching mechanism for starting and stopping spare emitting optical fiber, the first mechanism is connected with the first detection mechanism, the first detection mechanism is connected with the first switching mechanism, the second mechanism is connected with the second detection mechanism, and the second detection mechanism is connected with the second switching mechanism.

Description

Technical Field

[0001] This utility model relates to the field of information transmission technology for long-distance pipelines, and in particular to a monitoring and switching device and system for the main and backup fiber cores of pipeline accompanying optical cables. Background Technology

[0002] The communication system, as the information transmission system for long-distance pipelines, is responsible for transmitting data from various stations and valve chambers to the control center and providing auxiliary network, voice, and image services for the entire pipeline. The accompanying optical fiber cable is an important pipeline ancillary facility. Optical fiber cable failures not only significantly impact pipeline scheduling and operation but are also a crucial indicator of potential pipeline damage leading to leaks and safety / environmental incidents.

[0003] Communication optical cables are laid underground in parallel with pipelines, connected by optical cable junction boxes. Due to aging, construction defects, termite damage, and other factors, the fiber cores in use frequently break or experience performance degradation, leading to interruptions in communication data transmission and affecting data transmission and equipment status monitoring. Commonly used pipeline-accompanying communication optical cables come in different specifications such as 12-core, 24-core, and 36-core. Communication services between two relay stations on long-distance oil and gas pipeline trunk lines generally use single-mode single-fiber transmission, occupying 4 optical fibers in the cable; these are the used fiber cores, while the remaining fibers are in reserve.

[0004] Because the spare fiber core is in a cold standby state, the optical transmission system cannot monitor its performance indicators in real time. If the fiber in use breaks or its performance degrades, causing a communication interruption, it requires numerous procedures such as reporting, application, and on-site testing, and simultaneous fiber jumpering at both relay stations to restore communication. This method is inefficient and time-consuming. If the fault occurs at night or the maintenance personnel are not proficient, the communication restoration time will be even longer. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a monitoring and switching device and system for the main and backup fiber cores of a pipeline optical cable, which addresses the shortcomings of the existing technology.

[0006] The utility model discloses a technical scheme that solves the above technical problem as follows: a pipeline accompanying optical cable main and standby fiber core monitoring and switching device, it includes: first mechanism for separating fixed wavelength's test light source from the optical signal of main emitting fiber, second mechanism for separating fixed wavelength's test light source from the optical signal of standby emitting fiber, first detection mechanism for real-time monitoring main emitting fiber performance index, second detection mechanism for real-time monitoring standby emitting fiber performance index, first switching mechanism for opening and closing main emitting fiber and second switching mechanism for opening and closing standby emitting fiber, first mechanism is connected with first detection mechanism, first detection mechanism is connected with first switching mechanism, second mechanism is connected with second detection mechanism, and second detection mechanism is connected with second switching mechanism.

[0007] The beneficial effects of the technical scheme are as follows: the optical loss of the standby fiber core can be detected in real time, the standby fiber core is always in a hot standby state, the frequency of manual detection is reduced, and the work efficiency is improved. The pipeline accompanying optical cable is used to provide online monitoring for the line optical fiber between adjacent relay stations. When the main optical fiber fails, the system automatically detects and automatically switches to the standby optical fiber, reduces the optical cable line failure rate, improves the reliability of the communication system, reduces the influence of optical cable maintenance on the main optical path, and makes up for the long recovery time period of manual fiber adjustment.

[0008] Further, the first mechanism and the second mechanism are both lasers.

[0009] The beneficial effects of the above further technical scheme are as follows: the first laser and the second laser separate fixed-wavelength stable test light sources from the optical signals of the main emitting fiber and the standby emitting fiber respectively and input the optical signals into the main optical fiber and the standby optical fiber respectively.

[0010] Further, the first detection mechanism includes first detection devices and second detection devices, and the second detection mechanism includes third detection devices and fourth detection devices.

[0011] The beneficial effects of the above further technical scheme are as follows: the first detection devices, the second detection devices, the third detection devices, and the fourth detection devices are used to receive pipeline accompanying optical cable fiber core optical communication signals to monitor the line performance index in real time.

[0012] Further, the first switching mechanism and the second switching mechanism are both optical switches.

[0013] The beneficial effects of the above further technical scheme are as follows: the optical switches are used to execute main and standby fiber core automatic switching commands.

[0014] Further, the first detection mechanism, the second detection mechanism, the first switching mechanism, and the second switching mechanism are all connected with control units.

[0015] The beneficial effect of the further technical solution is that the control unit determines the command for automatic switching and issues a control instruction.

[0016] Further, the control unit is connected with an alarm device.

[0017] The beneficial effect of the further technical solution is that the light loss of the standby fiber core can be detected in real time, and an alarm is issued by setting a threshold, so that the standby fiber core is always in a hot standby state, reducing the frequency of manual detection and improving work efficiency. According to the alarm information, the working personnel can understand and master the state of the pipeline accompanying optical cable, and take appropriate measures.

[0018] Further, the first mechanism is connected with the first detection mechanism through the in-use main light emitting fiber, the first detection mechanism is connected with the first switching mechanism through the in-use main light emitting fiber, the second mechanism is connected with the second detection mechanism through the standby light emitting fiber, and the second detection mechanism is connected with the second switching mechanism through the standby light emitting fiber.

[0019] The beneficial effect of the further technical solution is that the pipeline accompanying optical cable is used to provide online monitoring for the line optical fiber between adjacent relay stations, when the in-use optical fiber fails, the system automatically detects and automatically switches to the standby optical fiber, reduces the failure rate of the optical cable line, improves the reliability of the communication system, reduces the influence of optical cable maintenance on the in-use optical path, and makes up for the long recovery time period of manual fiber adjustment.

[0020] In addition, the utility model provides a kind of pipeline accompanying optical cable main standby fiber core monitoring and switching system, including two above-mentioned any one described a kind of pipeline accompanying optical cable main standby fiber core monitoring and switching device, still include: A relay station and B relay station, the A relay station is adjacently arranged with the B relay station, the A relay station is connected with the B relay station by in-use main light emitting fiber and standby light emitting fiber, two pipeline accompanying optical cable main standby fiber core monitoring and switching device are connected with the A relay station and the B relay station one by one.

[0021] The beneficial effect of the technical solution of the utility model is that the pipeline accompanying optical cable is used to provide online monitoring for the line optical fiber between adjacent relay stations, when the in-use optical fiber fails, the system automatically detects and automatically switches to the standby optical fiber, reduces the failure rate of the optical cable line, improves the reliability of the communication system, reduces the influence of optical cable maintenance on the in-use optical path, and makes up for the long recovery time period of manual fiber adjustment.

[0022] Further, the A relay station and the B relay station are each provided with an optical transmission device and an ODF frame, one duct accompanying optical cable main and standby fiber core monitoring and switching device is connected between the optical transmission device and the ODF frame of the A relay station, and another duct accompanying optical cable main and standby fiber core monitoring and switching device is connected between the optical transmission device and the ODF frame of the B relay station.

[0023] The beneficial effects of the above further technical solution are: the duct accompanying optical cable is used to provide online monitoring for the line optical fiber between adjacent relay stations, when the in-use optical fiber fails, the system automatically detects and automatically switches to the standby optical fiber, reduces the optical cable line failure rate, improves the reliability of the communication system, reduces the influence of optical cable maintenance on the in-use optical path, and makes up for the long recovery time period of manual fiber adjustment.

[0024] Further, one duct accompanying optical cable main and standby fiber core monitoring and switching device is connected between the optical transmission device and the ODF frame of the A relay station through an optical fiber, and another duct accompanying optical cable main and standby fiber core monitoring and switching device is connected between the optical transmission device and the ODF frame of the B relay station through an optical fiber.

[0025] The beneficial effects of the above further technical solution are: the duct accompanying optical cable is used to provide online monitoring for the line optical fiber between adjacent relay stations, when the in-use optical fiber fails, the system automatically detects and automatically switches to the standby optical fiber, reduces the optical cable line failure rate, improves the reliability of the communication system, reduces the influence of optical cable maintenance on the in-use optical path, and makes up for the long recovery time period of manual fiber adjustment.

[0026] The advantages of the additional aspects of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The structure schematic view of the duct accompanying optical cable main and standby fiber core monitoring and switching device provided by the present application is shown.

[0028] Figure 2The utility model discloses a pipeline accompanying optical cable main spare fiber core monitoring and switching system's structure diagram for the embodiment of the utility model provides.

[0029] Explanation of reference numerals: 1, in use main light emitting fiber;2, first mechanism;3, spare light emitting fiber;4, second mechanism;5, first detection mechanism;6, second detection mechanism;7, first switching mechanism;8, second switching mechanism;9, first detection device;10, second detection device;11, third detection device;12, fourth detection device;13, control unit;14, A relay station;15, B relay station;16, optical transmission equipment;17, ODF frame. DETAILED DESCRIPTION

[0030] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and not used to limit the scope of the utility model.

[0031] As Figure 1 The utility model discloses a pipeline accompanying optical cable main spare fiber core monitoring and switching device, including: the first mechanism 2 for separating the fixed wavelength's test light source from the optical signal of in use main light emitting fiber 1, the second mechanism 4 for separating the fixed wavelength's test light source from the optical signal of spare light emitting fiber 3, the first detection mechanism 5 for real -time monitoring in use main light emitting fiber 1 performance index, the second detection mechanism 6 for real -time monitoring spare light emitting fiber 3 performance index, the first switching mechanism 7 for starting and closing in use main light emitting fiber 1 and the second switching mechanism 8 for starting and closing spare light emitting fiber 3, the first mechanism 2 with first detection mechanism 5 is connected, first detection mechanism 5 with first switching mechanism 7 is connected, the second mechanism 4 with second detection mechanism 6 is connected, and second detection mechanism 6 with second switching mechanism 8 is connected.

[0032] The beneficial effects of the technical scheme of the utility model are: the light loss condition of the spare fiber core can be detected in real time, so that the spare fiber core is always in a hot standby state, the frequency of manual detection is reduced, and the work efficiency is improved. The pipeline accompanying optical cable is used between adjacent relay stations to provide online monitoring for the line fiber. When the in-use fiber fails, the system automatically detects and automatically switches to the spare fiber, reduces the failure rate of the optical cable line, improves the reliability of the communication system, reduces the influence of optical cable maintenance on the in-use optical path, and makes up for the long recovery time period of manual fiber adjustment.

[0033] Figure 1 The arrow in the figure represents the transmission trajectory and transmission direction of the optical signal. Laser 1 is the first mechanism, laser 2 is the second mechanism, detection device 1 is the first detection device, detection device 2 is the second detection device, detection device 3 is the third detection device, detection device 4 is the fourth detection device, optical switch 1 is the first switching mechanism, and optical switch 2 is the second switching mechanism.

[0034] As shown in Figure 1 Further, the first mechanism 2 and the second mechanism 4 are both lasers.

[0035] The beneficial effects of the above further technical solutions are that the first laser and the second laser respectively separate the fixed-wavelength stable test light source from the optical signals of the in-use main light-emitting fiber and the standby light-emitting fiber, and respectively input the in-use fiber and the standby fiber.

[0036] As shown in Figure 1 Further, the first detection mechanism 5 includes a first detection device 9 and a second detection device 10, and the second detection mechanism 6 includes a third detection device 11 and a fourth detection device 12.

[0037] The beneficial effects of the above further technical solutions are that the first detection device, the second detection device, the third detection device, and the fourth detection device are respectively used to receive the fiber core optical communication signal of the pipeline accompanying optical cable to monitor the line performance index in real time.

[0038] As shown in Figure 1 Further, the first switching mechanism 7 and the second switching mechanism 8 are both optical switches.

[0039] The beneficial effects of the above further technical solutions are that the optical switch is used to execute the automatic switching command of the main and standby fiber cores.

[0040] As shown in Figure 1 Further, the first detection mechanism 5, the second detection mechanism 6, the first switching mechanism 7, and the second switching mechanism 8 are all connected with a control unit 13.

[0041] The beneficial effects of the above further technical solutions are that the control unit is used to determine the automatic switching command and issue a control instruction.

[0042] Further, the control unit 13 is connected with an alarm device.

[0043] The beneficial effects of the above further technical solutions are that the optical loss of the standby fiber core can be detected in real time, an alarm can be issued by setting a threshold, the standby fiber core is always in a hot standby state, the frequency of manual detection is reduced, and the work efficiency is improved. According to the alarm information, the staff can understand and master the state of the pipeline accompanying optical cable and take appropriate measures.

[0044] The alarm device can be an alarm lamp.

[0045] As shown in Figure 1As shown, further, the first mechanism 2 is connected with the main emitting fiber 1 through the first detection mechanism 5, the first detection mechanism 5 is connected with the first switching mechanism 7 through the main emitting fiber 1, the second mechanism 4 is connected with the second detection mechanism 6 through the standby emitting fiber 3, and the second detection mechanism 6 is connected with the second switching mechanism 8 through the standby emitting fiber 3.

[0046] The beneficial effects of the further technical scheme are: the pipeline accompanying optical cable is used to provide online monitoring for the line optical fiber between adjacent relay stations, when the in-use optical fiber fails, the system automatically detects and automatically switches to the standby optical fiber, reduces the optical cable line failure rate, improves the communication system reliability, reduces the influence of optical cable maintenance on the in-use optical path, and makes up for the long recovery time period of manual fiber adjustment.

[0047] The pipeline accompanying optical cable main and standby fiber core monitoring and switching device provided by the embodiment of the utility model can be used for long-distance pipeline accompanying optical cable main and standby fiber core online monitoring and automatic switching device.

[0048] As shown in the figure, Figure 1 The device (pipeline accompanying optical cable main and standby fiber core monitoring and switching device) comprises a first laser (first mechanism 2), a second laser (second mechanism 4), a first detection device 9, a second detection device 10, a third detection device 11, a fourth detection device 12, a control unit 13, a first optical switch (first switching mechanism 7), a second optical switch (second switching mechanism 8) and the like.

[0049] The first laser and the second laser separate the fixed-wavelength stable test light source from the optical signals of the main in-use emitting fiber T x1 and the standby emitting fiber T x2 respectively and input the main in-use optical fiber (main in-use emitting fiber 1) and the standby optical fiber 3 respectively.

[0050] The first detection device, the second detection device, the third detection device and the fourth detection device are used to receive the pipeline accompanying optical cable fiber core optical communication signals to monitor the line performance index in real time.

[0051] The control unit 13 is used to determine the automatic switching command and issue the control instruction.

[0052] The optical switch is used to execute the main and standby fiber core automatic switching command.

[0053] The device can detect the optical loss of the standby fiber core in real time, issue an alarm by setting a threshold, make the standby fiber core (standby emitting fiber) always in a hot standby state, reduce the manual detection frequency and improve the work efficiency.

[0054] As shown in the figure, Figure 2Further, the utility model provides a kind of pipeline accompanying optical cable main spare fiber core monitoring and switching system, including two above-mentioned any one described a kind of pipeline accompanying optical cable main spare fiber core monitoring and switching device, further include: A relay station 14 and B relay station 15, the A relay station 14 with the B relay station 15 adjacent arrangement, the A relay station 14 with the B relay station 15 are connected by in-use main emitting fiber 1 and spare emitting fiber 3, two pipeline accompanying optical cable main spare fiber core monitoring and switching device one-to-one correspondence with the A relay station 14 and the B relay station 15 are connected.

[0055] The beneficial effects of the technical scheme of the utility model are: using pipeline accompanying optical cable to provide online monitoring for line optical fiber between adjacent relay stations, when in-use optical fiber fails, the system automatically detects and automatically switches to spare optical fiber, reduces optical cable line failure rate, improves communication system reliability, reduces the influence of optical cable maintenance on in-use optical path, and makes up for the deficiency of long recovery time period of manual fiber adjustment.

[0056] Figure 2 The optical fiber online monitoring and automatic switching device in the utility model is a pipeline accompanying optical cable main spare fiber core monitoring and switching device. Figure 2 The arrow in the utility model represents the transmission trajectory and transmission direction of optical signal.

[0057] As shown in the utility model, Figure 2 Further, the A relay station 14 and the B relay station 15 are each provided with optical transmission equipment 16 and ODF rack 17, one pipeline accompanying optical cable main spare fiber core monitoring and switching device is connected between the optical transmission equipment and the ODF rack of the A relay station 14, and another pipeline accompanying optical cable main spare fiber core monitoring and switching device is connected between the optical transmission equipment and the ODF rack of the B relay station 15.

[0058] The beneficial effects of the above-mentioned further technical scheme are: using pipeline accompanying optical cable to provide online monitoring for line optical fiber between adjacent relay stations, when in-use optical fiber fails, the system automatically detects and automatically switches to spare optical fiber, reduces optical cable line failure rate, improves communication system reliability, reduces the influence of optical cable maintenance on in-use optical path, and makes up for the deficiency of long recovery time period of manual fiber adjustment. The optical communication signal output by the optical transmission equipment of the A relay station enters the pipeline accompanying optical cable main spare fiber core monitoring and switching device, and after passing through the laser, the fixed-wavelength stable test light source is separated out, and the remaining optical signal is transmitted to the B relay station through the in-use core in the optical cable, while the fixed-wavelength test light source is transmitted to the B relay station through the spare core in the optical cable. There is another pipeline accompanying optical cable main spare fiber core monitoring and switching device between the optical transmission equipment and the ODF rack of the B relay station, to receive the optical signal transmitted from the optical transmission equipment of the A relay station respectively.

[0059] As shown in the utility model, Figure 2As shown, further, one pipe along optical cable main standby fiber core monitoring and switching device is connected between the optical transmission equipment and the ODF frame in A relay station 14 through optical fiber, and another pipe along optical cable main standby fiber core monitoring and switching device is connected between the optical transmission equipment and the ODF frame in B relay station 15 through optical fiber.

[0060] The beneficial effects of the above further technical solutions are: the optical communication signal output by the optical transmission equipment of A relay station enters the pipe along optical cable main standby fiber core monitoring and switching device, and after passing through the laser, the stable test light source of fixed wavelength is separated out, the remaining optical signals are transmitted to B relay station through the in-use core in the optical cable, and the test light source of fixed wavelength is transmitted to B relay station through the standby core in the optical cable. There is another pipe along optical cable main standby fiber core monitoring and switching device between the optical transmission equipment and the ODF frame in B relay station, which is used to receive the optical signals transmitted from the optical transmission equipment of A relay station.

[0061] The two pipe along optical cable online monitoring and automatic switching devices (pipe along optical cable main standby fiber core monitoring and switching devices) are respectively connected between the optical transmission (optical transmission equipment) and the ODF frame (Optical Distribution Frame, ODF optical fiber distribution frame) in the communication machine room of adjacent A and B relay stations through optical fiber.

[0062] The optical communication signal output by the optical transmission equipment of A relay station enters the pipe along optical cable main standby fiber core monitoring and switching device, and after passing through the laser, the stable test light source of fixed wavelength is separated out, the remaining optical signals are transmitted to B relay station through the in-use core (in-use main emitting fiber 1) in the optical cable, and the test light source of fixed wavelength is transmitted to B relay station through the standby core (standby emitting fiber) in the optical cable. There is another pipe along optical cable main standby fiber core monitoring and switching device between the optical transmission equipment and the ODF frame in B relay station, which is used to receive the optical signals transmitted from the optical transmission equipment of A relay station.

[0063] When the in-use fiber core (in-use main emitting fiber) loss value is greater than the set threshold value, the detection unit (detection mechanism) cannot monitor the optical signal, and the optical fiber switching instruction is output through the control unit 13, and the optical switch immediately executes the switching command, and the in-use fiber core (in-use main emitting fiber) is quickly switched to the standby fiber core (standby emitting fiber), ensuring uninterrupted communication.

[0064] When the in-use fiber core (in-use main emitting fiber) is automatically switched to the standby fiber core (standby emitting fiber), or when the fiber core loss value is greater than the set threshold value, the control unit alarm light will issue an alarm, and the staff can understand and master the state of the pipe along optical cable according to the alarm information, and take appropriate measures.

[0065] Through the technical scheme, the pipeline accompanied optical cable is used to provide on-line monitoring for the line optical fiber between adjacent relay stations, when the in-use optical fiber fails, the system automatically detects and automatically switches to the standby optical fiber, the control switching time is less than 50ms, the optical cable fault recovery time is compressed from tens of minutes to millisecond level, the optical cable line failure rate is reduced, the communication system reliability is improved, the influence of optical cable maintenance on the in-use optical path is reduced, and the long recovery time period of manual fiber adjustment is compensated.

[0066] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A kind of pipeline accompanying optical cable main backup core monitoring and switching device, it is characterized in that, The application relates to a main-backup fiber core monitoring and switching device for a pipeline accompanying optical cable, which comprises the following: a first mechanism for separating a fixed-wavelength test light source from a light signal of a main-use emitting fiber, a second mechanism for separating a fixed-wavelength test light source from a light signal of a backup emitting fiber, a first detection mechanism for monitoring a performance index of the main-use emitting fiber in real time, a second detection mechanism for monitoring a performance index of the backup emitting fiber in real time, a first switching mechanism for starting and stopping the main-use emitting fiber, and a second switching mechanism for starting and stopping the backup emitting fiber, wherein the first mechanism is connected with the first detection mechanism, the first detection mechanism is connected with the first switching mechanism, the second mechanism is connected with the second detection mechanism, and the second detection mechanism is connected with the second switching mechanism. The first mechanism and the second mechanism are both lasers.

2. The apparatus according to claim 1, characterized in that, The first detection mechanism comprises a first detection device and a second detection device, and the second detection mechanism comprises a third detection device and a fourth detection device.

3. The apparatus according to claim 1, characterized in that, The first switching mechanism and the second switching mechanism are both optical switches.

4. The apparatus according to claim 1, characterized in that, The first detection mechanism, the second detection mechanism, the first switching mechanism and the second switching mechanism are all connected with a control unit.

5. The apparatus according to claim 1, wherein, The control unit is connected with an alarm device.

6. The kind of pipeline accompanied optical cable main and standby core monitoring and switching device according to claim 5, its characterized in that, The first mechanism is connected with the first detection mechanism through the main-use emitting fiber, the first detection mechanism is connected with the first switching mechanism through the main-use emitting fiber, the second mechanism is connected with the second detection mechanism through the backup emitting fiber, and the second detection mechanism is connected with the second switching mechanism through the backup emitting fiber.

7. The apparatus according to claim 1, wherein, The application further relates to a pipeline accompanying optical cable main-backup fiber core monitoring and switching device, which comprises two main-backup fiber core monitoring and switching devices as claimed in any one of claims 1 to 7, and further comprises an A relay station and a B relay station, wherein the A relay station is arranged adjacent to the B relay station, the A relay station and the B relay station are connected through a main-use emitting fiber and a backup emitting fiber, and the two main-backup fiber core monitoring and switching devices are connected with the A relay station and the B relay station one by one.

8. A monitoring and switching system for primary and backup fiber cores of a pipeline-accompanying optical cable, characterized in that, The A relay station and the B relay station are both provided with optical transmission equipment and an ODF frame, one main-backup fiber core monitoring and switching device is connected between the optical transmission equipment and the ODF frame of the A relay station, and the other main-backup fiber core monitoring and switching device is connected between the optical transmission equipment and the ODF frame of the B relay station.

9. The kind of pipeline optical fiber cable main and standby core monitoring and switching system according to claim 8, its characterized in that, One main-backup fiber core monitoring and switching device is connected between the optical transmission equipment and the ODF frame of the A relay station through an optical fiber, and the other main-backup fiber core monitoring and switching device is connected between the optical transmission equipment and the ODF frame of the B relay station through an optical fiber.

10. The kind of pipeline optical fiber cable main and standby core monitoring and switching system according to claim 9, its characterized in that, ​

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