CN113869650A - Intelligent analysis method for quality of transmission circuit - Google Patents
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Abstract
A transmission circuit quality intelligent analysis method extracts relevant indexes influencing circuit quality on the basis of a transmission circuit borne by a network, wherein the relevant indexes comprise circuit service indexes, circuit resource indexes and circuit fault alarm indexes, a clustering algorithm is adopted to analyze fault objects distributed in Gaussian distribution by utilizing a preset circuit type mapping rule, an alarm title rule and a circuit available rule to obtain the circuit availability, circuit quality difference data can be actively mined, a circuit unavailable alarm is derived, and active monitoring and fault positioning of the circuit quality are realized to reversely promote the improvement efficiency or effectively support operation management or evaluation and assessment.
Description
Technical Field
The invention relates to a network transmission and communication fault analysis technology, in particular to an intelligent analysis method for the quality of a transmission circuit, which extracts relevant indexes influencing the circuit quality on the basis of a transmission circuit loaded by a network, wherein the relevant indexes comprise circuit service indexes, circuit resource indexes and circuit fault alarm indexes, and analyzes a fault object distributed in Gaussian by using a clustering algorithm by using a preset circuit type mapping rule, an alarm title rule and a circuit available rule to obtain the circuit availability, so that circuit quality difference data can be actively mined, a derivative circuit cannot alarm, and the active monitoring and fault positioning of the circuit quality are realized to reversely promote the improvement efficiency or effectively support operation management or evaluation and assessment.
Background
The quality problem of the transmission circuit refers to a problem occurring in the operation process, and is a problem needing operation and maintenance personnel to find or process in time. In the traditional mode, for a network-borne circuit, faults are discovered through customer complaints, particularly in operation and maintenance management of special line business of government and enterprise, a corresponding support means is not used for discovering and early warning in advance, and the network-borne circuit is still in a passive operation and maintenance mode, so that the current situation of intense competition is not facilitated. Under the current mode, many networks coexist, cross network paragraph level is many, and circuit fortune dimension supports often all relies on understanding, the experience of being rich to fault handling to carry out artifical judgement through experienced fortune dimension personnel, increases the fortune dimension threshold undoubtedly, lacks the end-to-end quality analysis to the circuit, can't obtain the circuit quality condition the very first time, and then can't each region, and each network paragraph carries out accurate positioning, grabs and can't optimize the core. The inventor is dedicated to the quality analysis of the circuit availability, and in work, the circuit is actively grabbed from a large number of circuits by the quality analysis means of the circuit availability, in particular to important circuits such as a visitor collector, a China Mobile Internet Network (CMNET), an Internet Protocol (IP) bearer Network, a core Network, an Internet Data Center (IDC), a Mobile Data Communication Network (MDCN), a charging Network and the like, the warning Data is transmitted in combination, the hidden trouble of the circuit is actively discovered in time, and the early warning and closed-loop control are actively carried out by the set rules and thresholds, the specific maintenance personnel are actively informed, so that the hidden trouble actively bubbles, the hidden trouble is actively found, the hidden trouble is found before the client complains, the intervention processing is carried out in advance, the active consolation and the comfort are carried out, the current passive operation and maintenance situation is changed, and the client perception is improved, and avoiding deeper problems. Based on the research result, the situation of low availability of the circuit can be actively discovered before customer complaints, the prevention is pertinently carried out, and an efficient support system with active operation and maintenance and one-key fault positioning is realized. In view of the above, the present inventors have completed the present invention.
Disclosure of Invention
The invention provides an intelligent analysis method for transmission circuit quality aiming at the defects or shortcomings in the prior art, which extracts relevant indexes influencing the circuit quality on the basis of a transmission circuit loaded by a network, wherein the relevant indexes comprise circuit service indexes, circuit resource indexes and circuit fault alarm indexes, and utilizes a preset circuit type mapping rule, an alarm title rule and a circuit available rule to analyze fault objects distributed in Gaussian by adopting a clustering algorithm to obtain the circuit availability, so that circuit quality difference data can be actively mined, the derived circuit cannot alarm, and the active monitoring and fault positioning of the circuit quality are realized to reversely promote the improvement efficiency or effectively support the operation management or evaluation assessment.
The technical solution of the invention is as follows:
an intelligent analysis method for the quality of transmission circuit features that the relevant indexes including circuit service index, circuit resource index and circuit failure alarm index are extracted from the network carried transmission circuit, the failure objects in Gaussian distribution are analyzed by clustering algorithm to obtain the availability of circuit, and the quality difference data and/or unavailable alarm of derivative circuit are mined to realize the active monitor and failure location of circuit for backward promoting the improvement and management efficiency or effectively supporting operation management or evaluation and examination.
The circuit available rule comprises different threshold values set by a combined rule of circuit level, circuit type and speed dimension, and judgment and analysis of the circuit available state are realized according to judgment of the circuit available rate condition.
The alarm title rule comprises that through analysis of the current network historical alarm, when the alarm generated by a circuit source and a circuit sink is in an alarm set, the circuit is considered to be unavailable and is classified into the unavailable alarm set; calculating the fault time length of the circuit according to the generation time of the alarm and the elimination event; when the types of equipment manufacturers and systems are more, the unavailable alarm titles in the unavailable alarm set comprise network systems, manufacturers and alarm name fields.
The circuit type mapping rule comprises the steps of dividing according to the circuit type in the circuit scheduling work order and the types of different loaded services, relating to the types of a base station, a visitor collector, a CMNET, an IP (Internet protocol) load-bearing network, a core network, IDC (Internet data center), MDCN (media data network), charging, other types and the like, and being used for realizing quality evaluation taking the service as a visual angle.
The circuit availability ratio is (circuit available duration/total duration of cycle time) × 100%, the circuit available duration is total duration of cycle time-total duration of circuit unavailable duration, the circuit unavailable duration does not include the unavailable duration in the cutover time, the circuit availability ratio supports summarizing according to day, week, month or self-defined time period, and supports summarizing according to multiple dimensions such as attribution area, circuit name and service type.
The circuit availability is single service circuit availability or full-network service circuit availability, wherein the single service circuit availability is (1-per-day interruption time-second of single circuit/(24 × 60)). 100%, and the full-network service circuit availability is (1-total interruption time-second of all circuits/(24 × 60 × number of city services)). 100%.
The method comprises the steps of presenting the analysis result of the quality of a single circuit or the quality of a whole network, and presenting the city, the circuit name, the service type, the circuit level, the circuit speed, a source end network element, a source end port, a sink end network element, a sink end port, the fault duration, the circuit availability and the circuit availability state of the analysis result of the quality of the single circuit; and presenting the city, the circuit quantity, the service type, the circuit level, the fault duration and the circuit availability ratio for the whole network circuit quality analysis result.
The transmission network carried by the transmission circuit is a Synchronous Digital Hierarchy (SDH) network, a Packet Transport Network (PTN) and/or an Optical Transport Network (OTN).
The correlation indexes form a reference library for measuring the circuit quality indexes.
The circuit fault alarm type index adopts standardization processing and is matched with the circuit resource type index in a correlation mode, and the standardization processing comprises recording names of network management systems EMS of cities, manufacturers and transmission equipment manufacturers, equipment types, alarm serial numbers, alarm levels, alarm titles, alarm objects, network element names, board card names, port names, alarm occurrence time and alarm clearing time.
The invention has the following technical effects: the invention relates to an intelligent analysis method for transmission circuit quality, which is based on a circuit carried by a network, extracts relevant indexes influencing circuit quality, such as services, resources, alarms and the like, formulates a circuit type mapping rule, an alarm title rule and circuit available rule control through unified convergence standardization processing to form a circuit quality index measuring reference library, analyzes a fault object with Gaussian distribution by adopting a clustering algorithm, actively excavates circuit quality difference data, derives unavailable alarms of a circuit, realizes active monitoring and fault positioning of the circuit quality, reversely promotes the improvement efficiency, effectively supports operation management and evaluates and examines. In a word, the invention saves the cost of manpower, material resources and time in the aspects of fault positioning, fault removing guidance and the like by the traditional manual IT conversion means through the analysis of the available state of the circuit quality, provides decision assistance for network optimization, improves the efficiency of deterioration improvement, macroscopically grasps fault areas and fault equipment based on an area clustering analysis method, and excavates the circuit and the link thereof which need to be optimized and adjusted under the condition of low circuit availability for a long time.
Drawings
Fig. 1 is a schematic flow chart of a method for intelligently analyzing the quality of a transmission circuit according to the present invention. FIG. 1 includes step 110, obtaining alarm data from OMC northbound alarm interface (including 111-note: filter alarm header, only obtain corresponding alarm); step 120, entering a branch flow a, a branch flow b or a branch flow c according to alarm position information in the alarm data; the sub-process a goes through step a 3-step a7 to step 130, step a3, tunnel routing; step a4, tunneling; step a5, a pseudowire; step a6, the business is related to the pseudo wire; step a7, service; the sub-process b goes through the step b 3-the step b4 to the step 130, the step b3, channel routing; b4, channel; the sub-process c goes through the steps c 3-c 4 to the step 130, step c3, channel routing; step c4, wave channel; step 130, circuit routing; step 140, the circuit (including 141-input circuit type mapping rules); step 150, circuit fault analysis (including elimination of alarm superposition, 151-combined cutover work order resource analysis, and elimination of cutover influence alarms); step 160, circuit availability analysis (including 161-input circuit availability rules); step 170, annotating: and the circuit quality analysis is realized through the judgment of the analyzed circuit availability and the circuit available rule threshold.
Detailed Description
The invention is described below with reference to the accompanying drawings (fig. 1) and examples.
Fig. 1 is a schematic flow chart of a method for intelligently analyzing the quality of a transmission circuit according to the present invention. Referring to fig. 1, an intelligent analysis method for transmission circuit quality includes extracting relevant indexes affecting circuit quality on the basis of a transmission circuit loaded by a network, where the relevant indexes include circuit service indexes, circuit resource indexes and circuit fault alarm indexes, analyzing fault objects in gaussian distribution by using a clustering algorithm according to a preset circuit type mapping rule, an alarm title rule and a circuit available rule to obtain a circuit availability, and mining circuit quality difference data and/or deriving circuit unavailable alarms to realize active monitoring and fault positioning of circuit quality to reversely promote remediation efficiency or effectively support operation management or assessment and assessment. The circuit available rule comprises different threshold values set by a combined rule of circuit level, circuit type and speed dimension, and judgment and analysis of the circuit available state are realized according to judgment of the circuit available rate condition. The alarm title rule comprises that through analysis of the current network historical alarm, when the alarm generated by a circuit source and a circuit sink is in an alarm set, the circuit is considered to be unavailable and is classified into the unavailable alarm set; calculating the fault time length of the circuit according to the generation time of the alarm and the elimination event; when the types of equipment manufacturers and systems are more, the unavailable alarm titles in the unavailable alarm set comprise network systems, manufacturers and alarm name fields. The circuit type mapping rule comprises the steps of dividing according to the circuit type in the circuit scheduling work order and the types of different loaded services, relating to the types of a base station, a visitor collector, a CMNET, an IP (Internet protocol) load-bearing network, a core network, IDC (Internet data center), MDCN (media data network), charging, other types and the like, and being used for realizing quality evaluation taking the service as a visual angle.
The circuit availability ratio is (circuit available duration/total duration of cycle time) × 100%, the circuit available duration is total duration of cycle time-total duration of circuit unavailable duration, the circuit unavailable duration does not include the unavailable duration in the cutover time, the circuit availability ratio supports summarizing according to day, week, month or self-defined time period, and supports summarizing according to multiple dimensions such as attribution area, circuit name and service type. The circuit availability is single service circuit availability or full-network service circuit availability, wherein the single service circuit availability is (1-per-day interruption time-second of single circuit/(24 × 60)). 100%, and the full-network service circuit availability is (1-total interruption time-second of all circuits/(24 × 60 × number of city services)). 100%. The method comprises the steps of presenting the analysis result of the quality of a single circuit or the quality of a whole network, and presenting the city, the circuit name, the service type, the circuit level, the circuit speed, a source end network element, a source end port, a sink end network element, a sink end port, the fault duration, the circuit availability and the circuit availability state of the analysis result of the quality of the single circuit; and presenting the city, the circuit quantity, the service type, the circuit level, the fault duration and the circuit availability ratio for the whole network circuit quality analysis result. The transmission network carried by the transmission circuit is a Synchronous Digital Hierarchy (SDH) network, a Packet Transport Network (PTN) and/or an Optical Transport Network (OTN). The correlation indexes form a reference library for measuring the circuit quality indexes. The circuit fault alarm type index adopts standardization processing and is matched with the circuit resource type index in a correlation mode, and the standardization processing comprises recording names of network management systems EMS of cities, manufacturers and transmission equipment manufacturers, equipment types, alarm serial numbers, alarm levels, alarm titles, alarm objects, network element names, board card names, port names, alarm occurrence time and alarm clearing time.
FIG. 1 is a flow chart of an intelligent analysis method for transmission circuit quality according to the present invention, which includes a step 110 of obtaining alarm data (including 111-note: filtering alarm header, only obtaining corresponding alarm) from OMC north alarm interface; step 120, entering a branch flow a, a branch flow b or a branch flow c according to alarm position information in the alarm data; the sub-process a goes through step a 3-step a7 to step 130, step a3, tunnel routing; step a4, tunneling; step a5, a pseudowire; step a6, the business is related to the pseudo wire; step a7, service; the sub-process b goes through the step b 3-the step b4 to the step 130, the step b3, channel routing; b4, channel; the sub-process c goes through the steps c 3-c 4 to the step 130, step c3, channel routing; step c4, wave channel; step 130, circuit routing; step 140, the circuit (including 141-input circuit type mapping rules); step 150, circuit fault analysis (including elimination of alarm superposition, 151-combined cutover work order resource analysis, and elimination of cutover influence alarms); step 160, circuit availability analysis (including 161-input circuit availability rules); step 170, annotating: and the circuit quality analysis is realized through the judgment of the analyzed circuit availability and the circuit available rule threshold. The circuit type mapping rule is as follows: the quality evaluation with the service as the view point is realized according to the circuit types in the circuit scheduling work order and the different service types of the load, mainly relating to the types of a base station, a passenger collector, a CMNET, an IP load-bearing network, a core network, an IDC, an MDCN, charging, other types and the like. Wherein the alarm title rule is: by analyzing the historical alarm (the alarm causing the unavailable service, called unavailable alarm for short) of the existing network, when the alarm generated by the source terminal and the destination terminal of the circuit is in an alarm set, the circuit is considered to be unavailable. And calculating the fault time length of the circuit according to the generation time of the alarm and the elimination event. At present, the types of equipment manufacturers and systems are more, and fields such as network systems, manufacturers, alarm names and the like are considered in unavailable alarm sets. Wherein the circuit availability analysis is: and through the unavailable alarm set event of the configuration circuit, when the source port and the sink port of a certain circuit and the like have the configured alarm event, judging that the circuit is unavailable. The unavailable time of the circuit can be calculated through the occurrence time of the alarm event and the clearing time difference, so that the availability of the circuit is further calculated. Wherein the available state analysis of the circuit is: and judging the circuit availability threshold according to the formulated circuit availability rule. The circuit quality query is: the circuit availability ratio is analyzed according to the dimensions of a single circuit and a circuit in the city, and meanwhile, statistical analysis according to different cycle dimensions of days, weeks and months is also supported.
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to fig. 1 in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention. The technical scheme of the invention has the following specific implementation modes:
1) alarm data standardized parsing
The standardized processing of the transmission Network SDH (Synchronous Digital Hierarchy), PTN (Packet Transport Network) and OTN (optical Transport Network) alarm data is realized, and at least the city, the manufacturer, the EMS name (EMS, a Network management system of a transmission equipment manufacturer), the equipment type, the alarm flow number, the alarm level, the alarm title, the alarm object, the Network element name, the board name, the port name, the alarm occurrence time and the alarm clearing time are recorded according to the relevant adaptation of the required alarm set and the resource.
The service affecting alarm information is exemplified as follows:
hua is PTN: tunnel _ APS _ out (Tunnel Automatic Protection Switching out), PW _ APS _ out (Pseudowire Automatic Protection Switching out)
Zhongxing PTN: ETH (Ethernet) service interruption, TDM (time-division multiplexing) service interruption
Beacon PTN: SW _ FAIL (switching FAIL)
OTN/wavelength division: FEC _ OOF (Forward Error Correction Out Of Frame), FEC _ LOF (Forward Error Correction LOSs Of Frame), R _ LOS (Receive side Signal LOSs), R _ LOF (Receive side LOSs Of Frame), and other original alarms.
2) Circuit type mapping relationships
Based on the 58 types of circuit, the mapping of the relevant service types is realized, and the details are as follows:
3) circuit availability ratio analysis flow and algorithm
And analyzing information such as network elements, ports and the like which are obtained by the circuit path according to the circuit and the circuit route by combining resource models of different equipment types, thereby realizing the end-to-end serial connection of the circuit.
Analyzing whether the routes of the main and standby circuits are simultaneously interrupted or not according to the whole-course routing information of the information matching circuit reported by the alarm, calculating the fault interruption duration, considering that the circuit is unavailable as a normal condition in the cutover period, and calculating the availability ratio of the circuits and the like supports calculating the availability ratio after eliminating the cutover time period, which is shown in detail in fig. 1.
Duration of circuit unavailability: counting the unavailable time length of the circuit according to the day period, removing the overlapped unavailable time length, and rejecting the unavailable time length accumulation in the cutting and connecting time.
Duration of circuit available: total duration of cycle time-duration of circuit unavailability;
the circuit availability rate is 100% of the total time of the circuit availability duration/cycle time duration.
For example, circuit availability calculation method for day granularity:
single traffic circuit availability (1-single circuit interruption duration per day (seconds)/(24 × 60))) 100%.
For example, a circuit availability calculation method for day granularity of a full-grid city dimension circuit:
total network traffic circuit availability (1-total duration of interruptions per day for all circuits (seconds)/(24 × 60 × number of city traffic)) × 100%.
For example, long analysis when PTN circuits are not available:
scene 1: and judging whether the service (non-one source and two sinks) client side port has an alarm or not, wherein the alarm calculation time length exists.
Scene 2: and judging the client side port of the service (one source and two sinks), namely judging whether the source point has an alarm or not and judging the alarm calculation time length.
Scene 3: and judging whether the main tunnel and the standby tunnel have alarm and non-pseudo-wire protection at the same time or not at the side port (the tunnel routing port) of the service line, and judging that the alarm calculation time length exists.
Scene 4: and judging whether the main tunnel and the standby tunnel (4 tunnels) have performance out-of-limit and pseudo-wire protection at the same time or not at the side port (the tunnel routing port) of the service line, and the alarm calculation time length exists.
4) Rules of circuit availability
Different thresholds are set according to circuit level, circuit type and speed dimension combined rules, and judgment and analysis of the available state of the circuit are realized according to judgment of the circuit availability.
5) Circuit quality analysis result presentation
The availability of the circuit supports the summarization according to the day, week, month or custom time period, and simultaneously supports the summarization according to the multi-dimension of the attribution region (such as the city), the circuit name, the service type and the like.
The quality of a single circuit presents city, circuit name, service type, circuit level, circuit rate, source end network element, source end port, sink end network element, sink end port, fault duration, circuit availability and circuit availability.
The quality of the circuit in the whole network, the presence of city, circuit quantity, service type, circuit level, fault duration and circuit availability.
Based on SDH, PTN, OTN alarm data and circuit data analysis of transmission, include: the alarm set is classified and sorted, the circuit type mapping rule, the analysis process and algorithm of the circuit availability ratio, the circuit availability rule and judgment mode and the output of the circuit quality analysis result. The service alarm title is influenced by different equipment types which are manually combed, and a data source provided for circuit quality analysis is realized. A circuit type mapping relationship. Circuit availability analysis flow and algorithm. The circuit may use rules. And presenting the circuit quality analysis result.
The research in the text shows that the intelligent analysis of the quality of the transmission circuit is realized based on the analysis of the SDH, PTN and OTN alarm data and the circuit data, the current manual inspection and verification mode completely depends on is changed, the problems of long circuit fault positioning time, low efficiency and blind spot adjustment are solved, and the active analysis efficiency and the quality evaluation management means are improved.
Those not described in detail in this specification are within the skill of the art. It is pointed out here that the above description is helpful for the person skilled in the art to understand the invention, but does not limit the scope of protection of the invention. Any such equivalents, modifications and/or omissions as may be made without departing from the spirit and scope of the invention may be resorted to.
Claims (10)
1. An intelligent analysis method for the quality of transmission circuit features that the relevant indexes including circuit service index, circuit resource index and circuit failure alarm index are extracted from the network carried transmission circuit, the failure objects in Gaussian distribution are analyzed by clustering algorithm to obtain the availability of circuit, and the quality difference data and/or unavailable alarm of derivative circuit are mined to realize the active monitor and failure location of circuit for backward promoting the improvement and management efficiency or effectively supporting operation management or evaluation and examination.
2. The intelligent analysis method for the quality of the transmission circuit according to claim 1, wherein the circuit availability rules include different thresholds set by a combination rule of a circuit level, a circuit type and a speed dimension, and judgment and analysis of the circuit availability status are realized according to judgment of a circuit availability rate condition.
3. The intelligent analysis method for the quality of the transmission circuit according to claim 1, wherein the alarm title rule comprises that through analysis of historical alarms of the current network, when the alarms generated at the source and the destination of the circuit are in an alarm set, the circuit is considered to be unavailable and is classified into an unavailable alarm set; calculating the fault time length of the circuit according to the generation time of the alarm and the elimination event; when the types of equipment manufacturers and systems are more, the unavailable alarm titles in the unavailable alarm set comprise network systems, manufacturers and alarm name fields.
4. The intelligent analysis method for the quality of the transmission circuit according to claim 1, wherein the circuit type mapping rules include circuit types in the circuit scheduling work order, are divided according to different service types of the bearer, relate to types of a base station, a customer collector, a CMNET, an IP bearer network, a core network, an IDC, an MDCN, charging, and the like, and are used for realizing quality evaluation with the service as a view point.
5. The intelligent analysis method for the quality of the transmission circuit according to claim 1, wherein the circuit availability ratio (total circuit available duration/total cycle time duration) is 100%, the circuit available duration (total cycle time duration-total circuit unavailable duration), the circuit unavailable duration does not include the unavailable duration within the cutover time, the circuit availability ratio supports summarizing according to day, week, month or custom time periods, and supports summarizing according to multiple dimensions such as attribution area, circuit name, service type and the like.
6. The intelligent analysis method for transmission circuit quality according to claim 1, wherein the circuit availability is single traffic circuit availability (1-seconds per day interruption for single circuit/(24 × 60) × 100%) or full network traffic circuit availability (1-total seconds per day interruption for all circuits/(24 × 60) × 100%).
7. The intelligent analysis method for the quality of the transmission circuit according to claim 1, comprising presenting the analysis result of the quality of a single circuit or the quality of a whole network circuit, and presenting the analysis result of the quality of the single circuit to a local city, a circuit name, a service type, a circuit level, a circuit rate, a source end network element, a source end port, a sink end network element, a sink end port, a fault duration, a circuit availability rate, and a circuit availability status; and presenting the city, the circuit quantity, the service type, the circuit level, the fault duration and the circuit availability ratio for the whole network circuit quality analysis result.
8. The intelligent analysis method for the quality of the transmission circuit according to claim 1, wherein the transmission network carried by the transmission circuit is a Synchronous Digital Hierarchy (SDH) network, a Packet Transport Network (PTN) and/or an Optical Transport Network (OTN).
9. The intelligent analysis method for transmission circuit quality according to claim 1, wherein the correlation indicators form a reference library of metrics circuit quality indicators.
10. The intelligent analysis method for the quality of the transmission circuit according to claim 1, wherein the circuit fault alarm class index is standardized and adapted to the circuit resource class index, and the standardized process includes recording names of network management systems EMS, device types, alarm flow numbers, alarm levels, alarm titles, alarm objects, network element names, board names, port names, alarm occurrence times, and alarm clearing times.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116132261A (en) * | 2022-12-26 | 2023-05-16 | 浪潮通信信息系统有限公司 | Correlation analysis method, system and device for equipment faults and service |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116132261A (en) * | 2022-12-26 | 2023-05-16 | 浪潮通信信息系统有限公司 | Correlation analysis method, system and device for equipment faults and service |
| CN116132261B (en) * | 2022-12-26 | 2024-05-28 | 浪潮通信信息系统有限公司 | Correlation analysis method, system and device for equipment faults and service |
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