CN114826389B - Optical cable line safety level assessment method and assessment system thereof - Google Patents
Optical cable line safety level assessment method and assessment system thereof Download PDFInfo
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Abstract
The invention discloses an optical cable line safety level assessment method and an assessment system thereof, wherein the assessment method comprises the safety level assessment during line interruption and the safety level assessment during line loss; the safety grade evaluation during circuit interruption is to take the circuit interruption of a protection channel of a certain circuit section as one grade and take the interruption of a working channel and a protection channel of a certain circuit section as one grade; the security level evaluation flow during line loss is to judge the current working channel of the whole network line section in real time according to the alarming condition of the OLP single board, calculate the loss amount according to the specific channel generated by the line loss, and evaluate the performance of the corresponding circuit board on the loop and the OSNR value of the related channel according to the availability of the channel generated by the loss and the loss. The invention is suitable for evaluating the security level of the optical cable line and can practically improve the operation and maintenance capabilities of the optical cable line of the broadcast television backbone network.
Description
Technical Field
The invention relates to the technical field of broadcasting and television, in particular to an optical cable line security level assessment method and an assessment system thereof.
Background
In OTN (broadcast television backbone transmission network) system design, the considered system indexes mainly include attenuation, dispersion, nonlinear effect and OSNR, wherein the attenuation, dispersion and nonlinear effect can affect the system OSNR index. When OSNR is too low, an error correction error occurs in an OCh path (hereinafter referred to as a "channel"), which eventually leads to service interruption. Therefore, a good OSNR index is the basis for satisfying the stable operation of the OTN system. For an OTN system that is already in operation and has a stable topology, the cable line attenuation change is the most significant variable and affects the OSNR index of all channels of the whole network at any time. In the network operation process, the unexpected interruption of the line can directly influence the safety of the whole network service, and the line repair caused by the route transformation and the unexpected interruption can often cause the change of the attenuation of the optical cable link, thereby influencing the stability of the service. In order to ensure the long-term stable operation of the OTN system, the attenuation degree caused by unexpected circuit interruption and daily circuit maintenance needs to be analyzed and judged, so that the safe operation and maintenance capability of the backbone transmission network is improved.
Disclosure of Invention
The invention aims to provide an optical cable line safety level assessment method and an assessment system thereof. The invention is suitable for evaluating the security level of the optical cable line and can practically improve the operation and maintenance capabilities of the optical cable line of the broadcast television backbone network.
The technical scheme of the invention is as follows: a method for evaluating the safety level of an optical cable line comprises the steps of evaluating the safety level when the line is interrupted and evaluating the safety level when the line is lost;
the safety grade evaluation during circuit interruption is to take the circuit interruption of a protection channel of a certain circuit section as one grade and take the interruption of a working channel and a protection channel of a certain circuit section as one grade;
the security level evaluation flow during line loss is to judge the current working channel of the whole network line section in real time according to the alarming condition of the OLP single board, calculate the loss amount according to the specific channel generated by the line loss, and evaluate the performance of the corresponding circuit board on the loop and the OSNR value of the related channel according to the availability of the channel generated by the loss and the loss.
According to the optical cable line safety level assessment method, after the loss amount of the specific channel in which the line loss occurs is calculated, when the calculated loss rate is greater than 5dB for the working channel, the OLP switching is considered, and the loss influence degree is the fifth level with the highest.
In the above method for evaluating the security level of an optical cable line, in the calculation of the loss amount of a specific channel where the line loss occurs, when the calculated loss rate is less than 5dB for a working channel, it is determined that OLP switching does not occur, and further, the error condition of the line board and the single wave OSRN value are detected, if abnormal, the loss influence degree is a fourth level which is next highest, and if normal, the loss influence degree is a second level which is next to last highest.
According to the method for evaluating the safety level of the optical cable line, after the loss amount of the specific channel where the line loss occurs is calculated, the single wave OSRN value is evaluated for the protection channel, if the protection channel is normal, the protection channel is determined to be available, the loss influence degree is at the first level with the minimum, and if the protection channel is abnormal, the protection channel is determined to be not available, the loss influence degree is at the third level with the third highest.
The evaluation system of the optical cable line safety level evaluation method comprises a data acquisition layer, a data processing layer and an early warning response layer;
the data acquisition layer is used for acquiring the optical power data and the alarm data of the whole network;
the data processing layer compares the link security level knowledge base according to the whole network optical power data and the alarm data, and when the line is lost, the corresponding work order processing scheme is triggered, so that each operation task in the process is ensured to be circulated in a flow mode;
The early warning response layer applies a work order processing scheme formed by the data processing layer, and provides front-end application for different operation and maintenance personnel.
In the evaluation system, the data acquisition module performs data butt joint with the U2000 network manager according to the name service and the notification service of CORBA.
In the foregoing evaluation system, the data processing layer has a knowledge base of link security level, performs standardized modeling on typical processing schemes of the optical cable under evaluation of different security levels, divides the typical scene processing schemes into different types of worksheets, compiles a standardized processing scheme list library of optical cable line interruption and loss, and defines standard worksheet processing flows of each type of typical scene.
According to the evaluation system, the early warning response layer generates the large-screen command platform for the machine room operation and maintenance personnel through the data visualization technology, so that the operation and maintenance personnel can master the line safety condition and the fault handling condition at the first time.
Compared with the prior art, the invention constructs an OTN network optical cable line security level assessment system, can realize an automatic flow mode with accurate operation and maintenance and multi-span cooperation in the field of backbone network transmission, improves network operation and maintenance efficiency, and ensures the security and high-quality transmission of various businesses. The evaluation system is realized through a three-layer architecture of data acquisition, data processing and early warning response, can practically improve the operation and maintenance capacity of the main network optical cable line, and helps operation and maintenance personnel to quickly carry out treatment reaction.
Drawings
FIG. 1 is a schematic diagram of the OLP_OMS protection principle
Fig. 2 is a schematic flow diagram of the principles of the present invention.
Fig. 3 is a schematic diagram of the system of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
Examples: a method for evaluating the safety level of an optical cable line comprises the steps of evaluating the safety level when the line is interrupted and evaluating the safety level when the line is lost; the invention aims at an OTN (optical transport network) of a broadcast television backbone network in Zhejiang province, which consists of 23 stations, and a core station: a province center, xiaoshan movie center; node station: lake state, jiaxing, shaoxing, ningbo, zhoushan, ninghai, former name of a region in eastern zhejiang, wenzhou, lishui, jinhua, quzhou, zhuwu; and (3) a relay station: the Yuyao, linhai, leqing, qingdan, yongkang, jiande, fuyang and Tonglu form north ring, south ring, southwest ring and Ningbo-Zhoushan cross-sea links. According to the characteristics of broadcast television services, medium-melting city and county private lines and other services, the whole network channel planning distribution presents a star-shaped structure, a xiaoshan film and television central station is taken as a core, 1 100Gbps channel is respectively opened with 13 node stations in a point-to-point mode, and the protection channels with the same frequency are configured by utilizing the loop direction.
The health condition of the optical cable line resource determines the security of all channels of the OTN network, and further influences the stability of all services in the channels. In order to improve the security level of service transmission, optical cable links among all stations of the OTN network are protected by adopting double-route OLP_OMS. For service configuration, the SNCP protection mode is adopted for configuration by utilizing the main and standby channels. Therefore, the services carried in the channels have the dual protection mechanisms of the OLP and the SNCP, and the high reliability and the high safety of the service transmission are ensured.
As can be seen from fig. 1, on the line section where olp_oms protection is configured, since the trunk optical cable lines of the working channel and the protection channel adopt a heterogeneous path, the input optical power performance of the main and standby fil single board in-port is inconsistent. In the system debugging process, after the wavelength of all frequencies is subjected to joint debugging by utilizing the optical dynamic bifurcation multiplexing board and the amplifying board, on one hand, each single-wave optical power output by the main source OAU reaches the nominal optical power; on the other hand, the input optical power of the RI1 and RI2 ports of the OLP single board is kept consistent, and the initial difference value of the main input light and the standby input light is ensured to be 0. Meanwhile, the difference threshold of the main and standby input light of the OLP single board is set to be 5dB, so that when the difference value of the light power of the main and standby light ports exceeds 5dB, an optical switch module in the OLP single board outputs a channel with better selected light power through RO.
The safety grade evaluation during circuit interruption is to take the circuit interruption of a protection channel of a certain circuit section as one grade and take the interruption of a working channel and a protection channel of a certain circuit section as one grade; when a certain line section interruption occurs in a working channel, an OLP single board generates optical line protection switching, an optical switch outputs normal optical power of the protection channel, and at the moment, all the indexes of the whole network channel are normal, namely all the wavelength frequencies of the whole network have reasonable single-wave optical power and OSNR values, but SNCP service passing through the section and serving as a main channel is switched, and the switching time is about 20 ms; when a certain line interruption occurs in a protection channel, the channel index of the whole network is not changed, and the service is all normal. Based on the above situation, the single line segment interruption is divided into two levels, B1 and B2, according to the influence degree. For the B2 class, the channels on the corresponding ring will all be affected (channels are unprotected) and thus the SNCP traffic on the ring will be unprotected. When B1 events occur to a plurality of line sections of the whole network at the same time, the channel index is not affected, but the line rush-repair response is improved in level. The specific grading is shown in table 1:
TABLE 1
For the security level evaluation when the line loss occurs, the loss can be divided into two types according to different reasons for the line loss, one type is the loss generated in the line cutting process, and the other type is the loss caused by unexpected events or natural degradation. As shown in fig. 2, the current working channel of the whole network line section is determined in real time according to the alarm condition of the OLP board, then loss amount calculation is performed according to the specific channel where the line loss occurs, and evaluation is performed according to the availability of the channel where the loss occurs, the performance of the corresponding circuit board on the loop where the loss occurs, and the OSNR value of the relevant channel.
After the loss amount calculation is carried out on the specific channel where the line loss occurs, when the calculated loss rate is greater than 5dB for the working channel, the OLP switching is considered as the fifth level (A5 event) with the highest loss influence degree.
In the calculation of the loss amount of the specific channel where the line loss occurs, for the working channel, when the calculated loss rate is less than 5dB, it is determined that OLP switching does not occur, and then the error condition of the circuit board and the single wave OSRN value are detected, if abnormal, the loss influence degree is the fourth level (A4 event) with the next highest loss influence degree, and if normal, the loss influence degree is the second level (A2 event) with the next highest loss influence degree.
After the loss amount calculation is performed on the specific channel where the line loss occurs, for the protection channel, evaluating a single wave OSRN value, if the protection channel is normal, determining that the protection channel is available, then determining that the loss influence degree is at a first level with the minimum, and if the protection channel is abnormal, determining that the protection channel is not available, then determining that the loss influence degree is at a third level with the third highest (A3 event).
The above levels are summarized as shown in table 2:
TABLE 2
When the line breaks down, the operation and maintenance part responsible for line monitoring and the engineering part responsible for line rush-repair are cooperatively processed according to the line rush-repair flow of the optical cable line. For different reasons and different degrees of line loss, a corresponding processing scheme is formed, and the method comprises the following steps:
loss event generation:
The system automatically generates loss event and gives reference information, and the content comprises: the free core condition of the lossy line section, the VOA margin of the associated amplification plate.
Loss event protection:
1. loss occurs in Ningbo-Ninghai working channel (province network) section: the wave-calming receiving end descends by 1.3dB, the sea-calming receiving end descends by 1.5dB, the channel is available, and the line condition is observed in real time. Remarks: the circuit has 16-core free fiber cores; the balance of the Ningbo receiving end VOA is 0, and the balance of the Ninghai receiving end VOA is 1.8dB.
2. Loss occurs in Ningbo-Ninghai working channel (province network) section: the wave-calming receiving end descends by 6.3dB, the sea-calming receiving end descends by 5.5dB, and the channel is not available, so that the line is repaired in time. Remarks: the circuit has 16-core free fiber cores; the balance of the Ningbo receiving end VOA is 0, and the balance of the Ninghai receiving end VOA is 1.8dB.
Loss tolerance in the case of cutover:
When the interrupted emergency cutting or planned cutting is recovered, the operation and maintenance personnel inform the cutting operation personnel of the loss under the condition at the first time, the level of loss still exists after adjustment, and the cutting can be completed temporarily.
When the emergency cutting or the planned cutting is recovered after the interruption, the loss is not allowed to occur.
Treatment scheme in case of unexpected loss
1. The loss information such as test curves, event lists and the like is formed through online OTDR. For class A4 loss, OLP should be manually switched to operate in the normal channel.
2. The operation and maintenance personnel use the work order system to inform the related line maintenance departments of loss event information at the first time;
3. line maintenance department locates the loss location and determines emergency repair scheme (starting spare fiber or making emergency repair cut-over)
The class A4 and class A5 loss generated under the condition of unexpected loss can improve the processing efficiency, prevent the concurrency of loss events and avoid reducing the safety of the whole network channels again.
Example 2: the evaluation system for realizing the optical cable line safety level evaluation method comprises a data acquisition layer, a data processing layer and an early warning response layer as shown in fig. 3;
The data acquisition layer is used for realizing the acquisition of the whole network optical power data and the alarm data. In an OTN network formed by networking OSN equipment based on China, a U2000 client is used as an own network manager of the OTN network, and is responsible for functions of service management, operation and maintenance monitoring and the like, and a northbound CORBA interface is provided for a third party. The data acquisition module of the evaluation system can carry out data butt joint with the U2000 network manager according to the name service and the notification service of CORBA, so as to realize the acquisition of the whole network optical power data and the alarm data. When the data acquisition module makes a data acquisition request to the U2000, the optical power data periodically acquire the optical power data of the board card acquired by the U2000 in a polling request mode; the alarm data is transmitted to the subscription module [4] in a subscription notification mode. After the data are acquired, the data acquisition module further analyzes and extracts the two types of data and then pushes the two types of data to the front-end module for warehousing and storage.
And the data processing layer compares the link security level knowledge base according to the whole network optical power data and the alarm data, and when the line is lost, the corresponding work order processing scheme is triggered, so that each operation task in the process is ensured to be circulated in a flow mode. The data processing layer establishes a link security level knowledge base according to the security level division rule of the optical cable line and the data basis, performs standardized modeling on typical processing schemes of the optical cable line under different security levels, divides the typical scene processing schemes into different types of work orders, compiles a standardized processing scheme list library for optical cable line interruption and loss, and defines standard work order processing flow of each type of typical scene. And according to the warning information and the periodical optical power data of the line real-time monitoring, comparing the warning information and the periodical optical power data with a matched link security level knowledge base, and automatically triggering a corresponding typical scene work order processing scheme when the line is worn, so that each operation task in the process can be ensured to be circulated in a flow mode.
The early warning response layer applies a work order processing scheme formed by the data processing layer, and provides front-end application for different operation and maintenance personnel. The early warning response layer generates a large screen command platform facing machine room operation and maintenance personnel through a data visualization technology, and comprises the following steps: line fault information, security level notification, automatic processing flow information, work order real-time processing information and the like, so that operation and maintenance personnel can master line security conditions and fault processing conditions at the first time. And according to the comprehensive information of the large-screen command platform, the machine room operation and maintenance personnel shall send the determined unexpected fault event by using the work order system in the system. The working property of engineering maintenance personnel is considered to design a mobile terminal tool/platform/program based on WeChat public signals or small programs, and line maintenance personnel can receive specific fault information at the mobile terminal and start an emergency repair scheme.
In summary, the invention constructs an OTN network optical cable line security level assessment system, can realize an automatic flow mode with accurate operation and maintenance and multi-span cooperation in the field of backbone network transmission, improves network operation and maintenance efficiency, and ensures the security and high-quality transmission of various services. The evaluation system is realized through a three-layer architecture of data acquisition, data processing and early warning response, can practically improve the operation and maintenance capacity of the main network optical cable line, and helps operation and maintenance personnel to quickly carry out treatment reaction.
Claims (5)
1. The method for evaluating the safety level of the optical cable line is characterized by comprising the following steps of: the method comprises the steps of evaluating the security level when a line is interrupted and evaluating the security level when the line is damaged;
the safety grade evaluation during circuit interruption is to take the circuit interruption of a protection channel of a certain circuit section as one grade and take the interruption of a working channel and a protection channel of a certain circuit section as one grade;
The security level evaluation flow during line loss is to judge the current working channel of the whole network line section in real time according to the alarm condition of the OLP single board, calculate the loss amount according to the specific channel generated by the line loss, and evaluate the performance of the corresponding circuit board on the loop and the OSNR value of the related channel according to the availability of the channel generated by the loss and the loss;
after the loss amount of the specific channel where the line loss occurs is calculated, regarding the working channel, when the calculated loss rate is greater than 5dB, confirming that the OLP is switched, and the loss influence degree is the fifth level with the highest;
In the loss calculation of the specific channel in which the line loss occurs, for a working channel, when the calculated loss rate is smaller than 5dB, the working channel is determined that the OLP switching does not occur, and then the error condition of the circuit board and the single wave OSRN value are detected, if abnormal, the loss influence degree is a second-highest fourth level, and if normal, the loss influence degree is a second-last-highest second level;
After the loss amount calculation is performed on the specific channel where the line loss occurs, for the protection channel, evaluating a single wave OSRN value, if the protection channel is normal, determining that the protection channel is available, then determining that the loss influence degree is the first level with the minimum influence degree, and if the protection channel is abnormal, determining that the protection channel is not available, then determining that the loss influence degree is the third level with the third highest influence degree.
2. The evaluation system of the cable line security level evaluation method according to claim 1, wherein: the system comprises a data acquisition layer, a data processing layer and an early warning response layer;
the data acquisition layer is used for acquiring the optical power data and the alarm data of the whole network;
the data processing layer compares the link security level knowledge base according to the whole network optical power data and the alarm data, and when the line is lost, the corresponding work order processing scheme is triggered, so that each operation task in the process is ensured to be circulated in a flow mode;
The early warning response layer applies a work order processing scheme formed by the data processing layer, and provides front-end application for different operation and maintenance personnel.
3. The assessment system according to claim 2, wherein: and the data acquisition layer performs data butt joint with the U2000 network manager according to the name service and the notification service of CORBA.
4. The assessment system according to claim 2, wherein: the data processing layer is provided with a link security level knowledge base, standardized modeling is carried out on typical processing schemes of the optical cable under different security level evaluations, the typical scene processing schemes are divided into different types of work orders, a standardized optical cable line interruption and loss processing scheme list base is compiled, and standard work order processing flows of each type of typical scene are defined.
5. The assessment system according to claim 2, wherein: the early warning response layer generates a large screen command platform for machine room operation and maintenance personnel through a data visualization technology, so that the operation and maintenance personnel can master the line safety condition and the fault handling condition at the first time.
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