Transmission protection method and apparatus, and storage medium and computer program product

Abstract

Disclosed in the embodiments of the present application are a transmission protection method and apparatus, and a storage medium and a computer program product. The transmission protection apparatus is separately connected to a first optical transform unit (OTU), and a working path and a protection path which are configured to transmit a service signal of a second OTU, and the transmission protection apparatus communicates the first OTU with the working path. The transmission protection method, which is applied to the transmission protection apparatus, comprises: on the basis of an electrical-layer bit error rate of a working path, determining whether the working path fails, and detecting whether a protection path is available; and in the case where the working path fails and the protection path is available, switching a first OTU to be in communication with the protection path, such that the first OTU receives a service signal of a second OTU by means of the protection path.

Description

A transmission protection method, device, storage medium and computer program product

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311268544.1, application date September 27, 2023, and application name “A transmission protection method, device and storage medium”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application by introduction. Technical Field

[0003] The embodiments of the present application relate to the field of electronic communication technology, and in particular to a transmission protection method, device, storage medium, and computer program product. Background Art

[0004] At present, in order to ensure the stability of optical network transmission, dedicated protection switching mechanisms can be designed mainly at the electrical layer and the optical layer.

[0005] Referring to the principle diagram of electrical layer protection shown in Figure 1, the triggering of electrical layer protection switching is mainly based on the use of end-to-end overhead / operation administration and maintenance (OAM) to monitor the defect conditions, continuity / connection defect conditions and error degradation conditions of electrical layer signals.

[0006] Referring to the principle diagram of optical layer protection shown in Figure 2, the optical layer protection switching adopts a dual-transmit and selective-receive protection method. The optical power of the transmitting end is distributed to the two optical transmitting ports according to a certain splitting ratio, and is transmitted simultaneously along the optical fibers of the working path and the protection path. The receiving end detects the optical power of the two optical receiving ports and selects the path connected to the receiving port according to the power status and the set switching conditions.

[0007] In terms of network resource usage, as shown in Figure 1, electrical layer protection will simultaneously configure two optical transform units (OTUs). One is used as the primary to send signals to the optical fiber of the working path, and the other is used as the backup to send signals to the optical fiber of the protection path. Since the OTU itself is expensive, electrical layer protection is usually not configured to save network construction costs and only optical layer protection is configured.

[0008] However, in optical layer protection, the basis for determining protection switching is the optical power difference between the working path and the protection path at the receiving end. Protection switching will only be triggered when this difference exceeds a preset threshold. Since the signal quality will be affected by the optical transmission performance during transmission, the electrical layer signal will have a large bit error rate, which will affect service performance. At this time, the optical power difference between the working path and the protection path may not reach the threshold and cannot trigger the optical layer protection switching. Therefore, when electrical layer protection is not configured, the electrical layer signal may still not undergo protection switching even when it is severely degraded, resulting in low network protection effectiveness.

[0009] Summary of the Invention

[0010] The embodiments of the present application provide a transmission protection method, device, storage medium and computer program product, which can avoid the situation where no protection switching occurs even when the electrical layer signal is severely degraded, thereby improving the effectiveness of network protection.

[0011] The technical solution of the embodiment of the present application is implemented as follows:

[0012] An embodiment of the present application provides a transmission protection method, which is applied to a transmission protection device. The transmission protection device is connected to a first wavelength conversion unit (OTU), and a working path and a protection path for transmitting a service signal of a second OTU, respectively. The transmission protection device connects the first OTU to the working path. The method includes:

[0013] Determining whether the working path is faulty based on an electrical layer bit error rate of the working path, and detecting whether the protection path is available;

[0014] When the working path fails and the protection path is available, the first OTU is switched to be connected to the protection path, so that the first OTU receives the service signal of the second OTU through the protection path.

[0015] In the above method, judging whether the working path is faulty based on the electrical layer bit error rate of the working path includes:

[0016] receiving a first operation, maintenance, and management (OAM) signal sent by the first OTU; wherein the first OAM signal carries the electrical layer bit error rate, and the electrical layer bit error rate is detected by the first OTU;

[0017] The electrical layer bit error rate is compared with a bit error rate threshold, and whether the working path is faulty is determined based on the comparison result.

[0018] In the above method, determining whether the working path is faulty based on the comparison result includes:

[0019] If the comparison result is that the electrical layer bit error rate is greater than the bit error rate threshold, it is determined that the working path is faulty.

[0020] In the above method, the first OAM signal carries actual optical parameters of the working path, and the actual optical parameters are detected by the first OTU;

[0021] The determining whether the working path is faulty based on the comparison result includes:

[0022] receiving a second OAM signal transmitted by the second OTU through the working path; wherein the second OAM signal carries expected optical parameters of the working path determined by the second OTU;

[0023] If the comparison result is that the electrical layer bit error rate is greater than the bit error rate threshold, and the actual optical parameters are different from the expected optical parameters, it is determined that the working path is faulty.

[0024] In the above method, the actual optical parameter and the expected optical parameter each include at least one of the following types of parameters: received optical power and optical signal-to-noise ratio.

[0025] In the above method, the detecting whether the protection path is available includes:

[0026] Acquire transmission performance parameters of the protection path, and evaluate whether the protection path is available based on the transmission performance parameters.

[0027] In the above method, the transmission performance parameters at least include optical parameter information of the protection path.

[0028] This embodiment of the present application provides a transmission protection device. The transmission protection device is connected to a first OTU, and a working path and a protection path for transmitting a service signal of a second OTU, respectively. The transmission protection device connects the first OTU to the working path. The transmission protection device includes:

[0029] a processing module configured to determine whether the working path is faulty based on an electrical layer bit error rate of the working path, and to detect whether the protection path is available;

[0030] The control module is configured to, when the working path fails and the protection path is available, switch the first OTU to be connected to the protection path, so that the first OTU receives the service signal of the second OTU through the protection path.

[0031] An embodiment of the present application provides a transmission protection device, comprising: a processor, a memory, and a communication bus;

[0032] The communication bus is configured to implement a communication connection between the processor and the memory;

[0033] The processor is configured to execute one or more computer programs stored in the memory to implement the above-mentioned transmission protection method.

[0034] An embodiment of the present application provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned transmission protection method is implemented.

[0035] An embodiment of the present application provides a computer program product, including a computer program, which implements the above-mentioned transmission protection method when executed by a processor.

[0036] The embodiments of the present application provide a transmission protection method, device, storage medium, and computer program product. The transmission protection device is connected to a first wavelength conversion unit (OTU), and a working path and a protection path for transmitting a service signal of a second OTU. The transmission protection device connects the first OTU to the working path. The transmission protection method applied to the transmission protection device includes: judging whether the working path is faulty based on the electrical layer bit error rate of the working path, and detecting whether the protection path is available; if the working path is faulty and the protection path is available, switching the first OTU to connect to the protection path so that the first OTU receives the service signal of the second OTU through the protection path. The technical solution provided by the embodiments of the present application is that the transmission protection device judges whether the working path is faulty based on the electrical layer bit error rate of the working path, and detects whether the protection path is available, to further determine whether to trigger path switching. Compared with considering whether the optical power difference between the working path and the protection path reaches a threshold to trigger path switching, it can avoid the situation where the electrical layer signal is severely degraded and no protection switching occurs, thereby improving the effectiveness of network protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic diagram of an exemplary electrical layer protection principle provided in an embodiment of the present application;

[0038] FIG2 is a schematic diagram of an exemplary optical layer protection principle provided by an embodiment of the present application;

[0039] FIG3 is a schematic diagram of an exemplary configuration of optical layer protection provided in an embodiment of the present application;

[0040] FIG4 is a flow chart of a transmission protection method provided in an embodiment of the present application;

[0041] FIG5 is a schematic diagram of an exemplary interaction of protection switching decision according to an embodiment of the present application;

[0042] FIG6 is a schematic diagram of an exemplary optical layer OAM signal modulation and demodulation according to an embodiment of the present application;

[0043] FIG7 is a first structural diagram of a transmission protection device provided in an embodiment of the present application;

[0044] FIG8 is a second structural diagram of a transmission protection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0046] The following will specifically describe the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems through embodiments and in conjunction with the accompanying drawings. The following embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0047] In addition, the technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

[0048] Figure 3 is a schematic diagram of an exemplary optical layer protection configuration provided by an embodiment of the present application. As shown in Figure 3, a primary configuration for optical layer protection is optical multiplex section protection (OMSP), an end-to-end protection method. In the prior art, a 1+1 OMSP unit at the receiving end triggers real-time optical layer protection switching upon detecting signal loss in the working path or a >3dB optical power difference between the working and protection paths. The protection switching is triggered based on the detection of optical signal power.

[0049] An embodiment of the present application provides a transmission protection method, which is a solution that only triggers optical layer protection switching when the protection switching function is not configured at the electrical layer. When the electrical layer signal of the working path degrades, resulting in bit errors exceeding the limit, it is determined whether the protection path is available. If it is available, the optical layer protection switching is triggered. The triggering condition of this protection switching does not rely solely on the optical power difference between the working path and the protection path exceeding the threshold, and the performance of the protection path is evaluated in advance to ensure the availability of the protection path.

[0050] The transmission protection method provided in the embodiments of the present application is implemented using a transmission protection device, which can specifically be the 1+1 optical multiplex section protection unit shown in Figure 3. The transmission protection device is connected to the first OTU and the working path and protection path used to transmit the service signal of the second OTU, respectively. The transmission protection device connects the first OTU to the working path.

[0051] FIG4 is a flow chart of a transmission protection method provided in an embodiment of the present application. As shown in FIG4 , in an embodiment of the present application, the transmission protection method mainly includes the following steps:

[0052] S101 : Determine whether a working path is faulty based on the electrical layer bit error rate of the working path, and detect whether a protection path is available.

[0053] In an embodiment of the present application, the transmission protection device may determine whether the working path is faulty based on the electrical layer bit error rate of the working path, and detect whether the protection path is available.

[0054] It can be understood that in the embodiments of the present application, the transmission protection device determines whether the working path is faulty based on the electrical layer bit error rate of the working path, and detects whether the protection path is available, so as to further determine whether to trigger path switching. Compared with considering whether the optical power difference between the working path and the protection path reaches the threshold to trigger path switching, it can avoid the situation where no protection switching occurs even when the electrical layer signal is very degraded, thereby improving the effectiveness of network protection.

[0055] In an embodiment of the present application, the transmission protection device determines whether the working path is faulty based on the electrical layer bit error rate of the working path, including: receiving a first operation administration and maintenance (OAM) signal sent by a first OTU; wherein the first OAM signal carries the electrical layer bit error rate, and the electrical layer bit error rate is detected by the first OTU; comparing the electrical layer bit error rate with a bit error rate threshold, and determining whether the working path is faulty based on the comparison result.

[0056] It should be noted that in an embodiment of the present application, the transmission protection device connects the first OTU to the working path. Based on this, the first OTU can detect the electrical layer bit error rate of the working path, and then provide it to the transmission protection device through the first OAM signal, so that the transmission protection device can judge whether the working path is faulty by comparing the electrical layer bit error rate with the bit error rate threshold.

[0057] It should be noted that in the embodiments of the present application, a bit error rate threshold may be pre-set in the transmission protection device. Of course, other devices may also provide the bit error rate threshold to the transmission protection device. The specific bit error rate threshold may be set according to actual needs and application scenarios, and is not limited in the embodiments of the present application.

[0058] It should be noted that in the embodiment of the present application, the transmission protection device determines whether the working path is faulty based on the comparison result. It can only consider the comparison result to determine whether the working path is faulty, or it can comprehensively determine whether the working path is faulty based on the comparison result and other information.

[0059] In an embodiment of the present application, the transmission protection device determines whether the working path is faulty based on the comparison result, which may include: determining that the working path is faulty when the comparison result is that the electrical layer bit error rate is greater than the bit error rate threshold.

[0060] It can be understood that in the embodiments of the present application, the transmission protection device can only consider the size of the electrical layer bit error rate to determine whether the working path is faulty, that is, when the electrical layer bit error rate is greater than the bit error rate threshold, the working path is determined to be faulty; when the electrical layer bit error rate is less than or equal to the bit error rate threshold, the working path is determined to be not faulty.

[0061] In an embodiment of the present application, the first OAM signal carries actual optical parameters of the working path, and the actual optical parameters are detected by the first OTU. The transmission protection device determines whether the working path is faulty based on the comparison result, and may also include: receiving a second OAM signal transmitted by the second OTU through the working path; wherein the second OAM signal carries expected optical parameters of the working path determined by the second OTU; when the comparison result is that the electrical layer bit error rate is greater than the bit error rate threshold, and the actual optical parameters are different from the expected optical parameters, it is determined that the working path is faulty.

[0062] It is understood that in the embodiments of the present application, the transmission protection device can consider the electrical layer bit error rate (BER) and the actual optical parameters of the working path to determine whether the working path is faulty. Each wavelength at the second OTU end has an initial optical parameter, primarily optical power. Based on collected line parameters, including but not limited to fiber attenuation, amplifier noise figure, and gain, the expected value of the normal optical signal-to-noise ratio (OSNR) at the first OTU end is calculated. The expected received optical power and SNR are then written as expected optical parameters into the second OAM message area and transmitted to the transmission protection device. After each wavelength service is transmitted, the received optical power (optical layer), OSNR (optical layer), and BER (electrical layer) corresponding to each wavelength at the first OTU can be detected. Because there are uncertainties in line transmission, actual reception performance may differ from expected reception performance. The transmission protection device can determine whether the actual optical parameters are consistent with the expected optical parameters. If they are inconsistent, and the electrical layer BER exceeds the BER threshold, the working path is determined to be faulty. Whether the working path is faulty is determined at both the optical and electrical layers, thereby further improving the accuracy of working path fault determination and enabling more accurate path switching control in the future.

[0063] It should be noted that in the embodiments of the present application, the actual optical parameters and expected optical parameters each include at least one of the following types of parameters: received optical power and optical signal-to-noise ratio. The specific types of parameters included in the actual optical parameters and expected optical parameters can be set based on actual needs and application scenarios and are not limited in the embodiments of the present application.

[0064] In an embodiment of the present application, the transmission protection device not only needs to determine whether the working path is faulty, but also needs to detect whether the protection path is available. The transmission protection device can detect whether the protection path is available after determining whether the working path is faulty, or it can trigger the determination of whether the working path is faulty and the detection of whether the protection path is available based on other methods. The embodiment of the present application does not limit this.

[0065] In an embodiment of the present application, the transmission protection device detects whether a protection path is available, including: acquiring transmission performance parameters of the protection path, and evaluating whether the protection path is available based on the transmission performance parameters.

[0066] In an embodiment of the present application, the transmission performance parameter includes at least optical parameter information of the protection path.

[0067] It should be noted that in an embodiment of the present application, a working path and a protection path are used to transmit the service signal of the second OTU, and the transmission protection device selectively enables the first OTU to receive the dual-transmission and selective reception configuration of the second OTU through one of the paths, that is, the optical layer protection configuration. When the transmission protection device connects the first OTU with the working path, the service of the working path can detect the electrical layer performance parameters in the first OTU, but the protection path is not connected to the first OTU and therefore the electrical layer performance parameters cannot be detected. Therefore, it is possible to first evaluate whether the protection path is available by collecting optical parameter information on the protection path.

[0068] S102: When the working path fails and the protection path is available, switch the first OTU to connect with the protection path, so that the first OTU receives the service signal of the second OTU through the protection path.

[0069] In an embodiment of the present application, when a working path fails and a protection path is available, the transmission protection device switches the first OTU to be connected to the protection path, so that the first OTU receives the service signal of the second OTU through the protection path.

[0070] It can be understood that, in the embodiment of the present application, the transmission protection device can make a protection switching decision based on the states of the working path and the protection path.

[0071] The following is an illustrative description of relevant scenarios of the transmission protection method provided in the embodiment of the present application based on the above steps S101 and S102.

[0072] Figure 5 is an interactive diagram of an exemplary protection switching decision provided by an embodiment of the present application. As shown in Figure 5, combined with the relevant content in the above step S101, in the scenario where the Z-end OTU receives the service signal transmitted by the A-end OTU, the Z-end OTU is equivalent to the above-mentioned first OTU, the A-end OTU is equivalent to the above-mentioned first OTU, and the Z-end 1+1 optical multiplexing section protection unit is equivalent to the above-mentioned transmission protection device. The Z-end OTU can write information such as the received optical power, optical signal-to-noise ratio and electrical layer bit error rate information into the optical layer OAM signal and send it back to the Z-end 1+1 optical multiplexing section protection unit for the Z-end 1+1 optical multiplexing section protection unit to extract the corresponding information. In the scenario where the A-end OTU receives the service signal transmitted by the Z-end OTU, the A-end OTU is equivalent to the above-mentioned first OTU, the Z-end OTU is equivalent to the above-mentioned first OTU, and the A-end 1+1 optical multiplex section protection unit is equivalent to the above-mentioned transmission protection device. The A-end OTU can write information such as the received optical power, optical signal-to-noise ratio and electrical layer bit error rate into the optical layer OAM signal and send it back to the A-end 1+1 optical multiplex section protection unit. The A-end 1+1 optical multiplex section protection unit makes a protection switching decision after extracting the relevant information.

[0073] Figure 6 is a schematic diagram of an exemplary optical layer OAM signal modulation and demodulation provided by an embodiment of the present application. As shown in Figure 6, in the optical terminal multiplexer (OTM)-transmitter (TX), the black triangle represents the built-in digital signal processor of its OTU or the device in the optical module, which is used to realize frequency division multiplexing modulation of the carrier frequency in the MHz order. The modulation information includes performance information such as the received optical power, optical signal-to-noise ratio, and bit error rate. The ratio of the AC modulation information amplitude to the DC optical power is defined as the modulation depth. The modulation depth reflects the strength of the top modulation signal relative to the main optical service signal. The greater the modulation depth, the better the top modulation signal performance. On this basis, an optical layer OAM information detection and processing unit can be designed, that is, the black circle in the figure, to realize single-board detection and low-frequency overhead detection functions. The service wavelength signal is branched and input into the detection and processing unit according to a reasonable splitting ratio. The optical layer OAM signal is extracted through photoelectric conversion, electrical amplification and analog-to-digital conversion. The unit can be deployed in any device that needs to be deployed, as shown in Figure 6. The transmission protection device provided in the embodiment of the present application may include the optical layer OAM information detection and processing unit to achieve the corresponding functions.

[0074] The present application also provides a transmission protection device, which is connected to the first OTU and the working path and protection path for transmitting the service signal of the second OTU, respectively. The transmission protection device connects the first OTU to the working path. Figure 7 is a structural schematic diagram of a transmission protection device provided in an embodiment of the present application. As shown in Figure 7, in an embodiment of the present application, the transmission protection device includes:

[0075] The processing module 201 is configured to determine whether the working path is faulty based on the electrical layer bit error rate of the working path, and detect whether the protection path is available;

[0076] The control module 202 is configured to, when the working path fails and the protection path is available, switch the first OTU to connect with the protection path, so that the first OTU receives the service signal of the second OTU through the protection path.

[0077] In one embodiment of the present application, the processing module 201 is configured to receive a first operation, maintenance and management (OAM) signal sent by the first OTU; wherein the first OAM signal carries the electrical layer bit error rate, and the electrical layer bit error rate is detected by the first OTU; compare the electrical layer bit error rate with the bit error rate threshold, and determine whether the working path is faulty based on the comparison result.

[0078] In an embodiment of the present application, the processing module 201 is configured to determine that the working path is faulty if the comparison result is that the electrical layer bit error rate is greater than the bit error rate threshold.

[0079] In an embodiment of the present application, the first OAM signal carries actual optical parameters of the working path, and the actual optical parameters are detected by the first OTU;

[0080] In one embodiment of the present application, the processing module 201 is configured to receive a second OAM signal transmitted by the second OTU through the working path; wherein the second OAM signal carries the expected optical parameters of the working path determined by the second OTU; and when the comparison result is that the electrical layer bit error rate is greater than the bit error rate threshold and the actual optical parameters are different from the expected optical parameters, it is determined that the working path is faulty.

[0081] In an embodiment of the present application, the actual optical parameter and the expected optical parameter each include at least one of the following types of parameters: received optical power and optical signal-to-noise ratio.

[0082] In an embodiment of the present application, the processing module 201 is configured to obtain transmission performance parameters of the protection path, and evaluate whether the protection path is available based on the transmission performance parameters.

[0083] In an embodiment of the present application, the transmission performance parameters at least include optical parameter information of the protection path.

[0084] Figure 8 is a second structural diagram of a transmission protection device provided in an embodiment of the present application. As shown in Figure 8, in an embodiment of the present application, the transmission protection device includes: a processor 301, a memory 302, and a communication bus 303;

[0085] The communication bus 303 is configured to implement a communication connection between the processor 301 and the memory 302;

[0086] The processor 301 is configured to execute one or more computer programs stored in the memory 302 to implement the above-mentioned transmission protection method.

[0087] An embodiment of the present application provides a computer program product, including a computer program, which implements the above-mentioned transmission protection method when executed by a processor.

[0088] The embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, which implements the above-mentioned transmission protection method when executed by a processor. The computer-readable storage medium can be a volatile memory (volatile memory), such as a random-access memory (RAM); or a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD); or it can be a respective device including one or any combination of the above memories, such as a mobile phone, a computer, a tablet device, a personal digital assistant, etc.

[0089] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0090] The present application is described with reference to the implementation flow diagram and / or block diagram of the method, device (system) and computer program product according to the embodiment of the present application. It should be understood that each flow and / or box in the flow diagram and / or block diagram and the combination of the flow and / or box in the flow diagram and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processing machine or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for realizing the function specified in one flow diagram or multiple flows and / or one block or multiple blocks of the block diagram.

[0091] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in implementing one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0092] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0093] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this utility model should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A transmission protection method, applied to a transmission protection device, wherein the transmission protection device is connected to a first wavelength conversion unit (OTU), and a working path and a protection path for transmitting a service signal of a second OTU, respectively, and the transmission protection device connects the first OTU to the working path, the method comprising: Determine whether the working path is faulty based on the electrical layer bit error rate of the working path, and detect whether the protection path is available; When the working path fails and the protection path is available, the first OTU is switched to be connected to the protection path, so that the first OTU receives the service signal of the second OTU through the protection path.

2. The method according to claim 1, wherein: The determining whether the working path is faulty based on the electrical layer bit error rate of the working path includes: receiving a first operation, maintenance and management (OAM) signal sent by the first OTU; wherein the first OAM signal carries the electrical layer bit error rate, and the electrical layer bit error rate is obtained by detection by the first OTU; The electrical layer bit error rate is compared with a bit error rate threshold, and based on the comparison result, it is determined whether the working path is faulty.

3. The method according to claim 2, wherein: The determining whether the working path is faulty based on the comparison result includes: When the comparison result is that the electrical layer bit error rate is greater than the bit error rate threshold, it is determined that the working path is faulty.

4. The method according to claim 2, wherein: The first OAM signal carries actual optical parameters of the working path, where the actual optical parameters are detected by the first OTU; The determining whether the working path is faulty based on the comparison result includes: receiving a second OAM signal transmitted by the second OTU through the working path; wherein, The second OAM signal carries the expected optical parameters of the working path determined by the second OTU; When the comparison result is that the electrical layer bit error rate is greater than the bit error rate threshold, and the actual optical parameter is different from the expected optical parameter, it is determined that the working path is faulty.

5. The method according to claim 4, wherein: The actual optical parameter and the expected optical parameter respectively include at least one of the following types of parameters: received optical power and optical signal-to-noise ratio.

6. The method according to claim 1, wherein: The detecting whether the protection path is available includes: A transmission performance parameter of the protection path is acquired, and whether the protection path is available is evaluated based on the transmission performance parameter.

7. The method according to claim 6, wherein: The transmission performance parameters include at least optical parameter information of the protection path.

8. A transmission protection device, wherein the transmission protection device is connected to a first OTU, and a working path and a protection path for transmitting a service signal of a second OTU, respectively, and the transmission protection device connects the first OTU with the working path, and the transmission protection device comprises: A processing module, configured to determine whether the working path is faulty based on the electrical layer bit error rate of the working path, and detect whether the protection path is available; The control module is used to switch the first OTU to be connected with the protection path when the working path fails and the protection path is available, so that the first OTU receives the service signal of the second OTU through the protection path.

9. A transmission protection device, comprising: processor, memory, and communications bus; The communication bus is configured to realize a communication connection between the processor and the memory; The processor is configured to execute one or more computer programs stored in the memory to implement the transmission protection method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the transmission protection method according to any one of claims 1 to 7.

11. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the transmission protection method according to any one of claims 1 to 7 is implemented.

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