CN102281167A - Method and system for detecting power failure of network equipment - Google Patents
Method and system for detecting power failure of network equipment Download PDFInfo
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Abstract
The invention discloses a method and system for detecting a power failure of network equipment. The method comprises the following steps of: monitoring whether a power supply voltage of network equipment drops abnormally or not in the instant of power failure by a monitor, and if so, commanding a characteristic encoder to generate a power failure characteristic code; cutting off the transmission of normal service data through the network equipment, and immediately transmitting the power failure characteristic code to a transmission network by adopting an all-channel way by the characteristic encoder; searching and receiving the power failure characteristic code by a characteristic code detector in opposite-end equipment; and detecting whether optical signal blackout of a transmission optical path occurs or not by the opposite-end equipment, and if so, reporting a power failure fault of the network equipment to a webmaster unit. According to the system and method disclosed by the invention, not only is the power failure detection of the network equipment at a far end realized, but also the expansion to power supply monitoring of the network equipment is realized, and a power failure alarm of a power supply system and other types of power faults can be discriminated.
Description
Technical field
The present invention relates to the Network Transmission field, particularly a kind of network appliance power-down detection method and system.
Background technology
In communication network, normal power supply is the basis of the normal operation of each network equipment, but often also have the device powers down that a variety of causes causes, as externally fed system cut-off faults such as electric network fault, power cuts to limit consumption, network equipment its own power source fault, and artificial closing device etc., these all can cause device powers down, are also referred to as device looses power usually.
Owing to the reason that causes device looses power is varied, Virtual network operator must be screened rapidly, judges tissue repairing in time.Power supply can cause when stopping that the laser of fibre optic transmission equipment quits work in the network, and network service is interrupted, so will produce receipts No Light Alarm signal in the opposite end of optical fiber; But, also can produce when Transmission Fibers opens circuit and receive the No Light Alarm signal at opposite equip..The Transmission Fibers open circuit fault needs field work usually, and difficulty is bigger; The power down fault relatively easily finds remedial measure.For example, the situation of the frequent user side non-working time closing device that occurs does not then need to take any measure in the reality operation, and power failure then needs the on-call maintenance power-supply system.This assessment fault warning order of severity, the mode of handling respectively are crucial to the maintenance of the network equipment.
Present technology can send power fail warning to the opposite end communication equipment immediately by monitoring the unusual decline of supply power voltage in outage, thereby finds, deagnostic communication device looses power fault, improves the efficient of network operation.Yet problem is, this power fail warning method can not be screened by the device power supply (DPS) performance degradation and cause the electric voltage exception of the moment that fault causes to descend, be the power supply transient fault, and the alarm that only can provide externally fed system cut-off or network equipment power supply thoroughly to damage.
Summary of the invention
The power failure detection method and the system that the purpose of this invention is to provide a kind of network equipment make the device looses power alarm have higher accuracy and reliability.
For addressing the above problem, the invention provides a kind of network appliance power-down detection method, comprising:
Steps A: whether the supply power voltage of watch-dog monitoring network equipment has unusual decline, if then the command characteristics encoder generates the power-down features coding;
Step B: when unusual decline appears in the supply power voltage that monitors the network equipment, cut off the transmission of regular traffic data, adopt the full tunnel mode to send the power-down features coding to transmission network immediately;
Step C: the feature coding detector searches in the opposite equip. also receives described power-down features coding;
Step D: opposite equip. receives whether described power-down features coding back detected transmission light path light signal occurs and disappear, if, then to network management unit reporting ent equipment generation power down fault.
Preferably, described step D also comprises: if not, and then to network management unit reporting ent equipment generation power supply transient fault.
Preferably, further comprise step S between step C and the step D: the feature coding detector is confirmed the power-down features coding that receives.
Confirm among the described step S that the power-down features coding comprises: the power-down features coding of receiving is counted, and whether the power-down features coding that occurs continuously is greater than N, and wherein N is the positive integer more than or equal to 3, if, then confirm the power-down features coding, enter step D, if not, then return step C.
Feature coding device generation power-down features coding comprises in the described steps A: the feature coding device generates the power-down features coding with regular traffic data different frequency.
Feature coding device generation power-down features coding comprises in the described steps A: the feature coding device generates the power-down features coding with regular traffic data different coding mode.
The setting-up time execution in step D again of being separated by after the described step C, wherein, described setting-up time is determined according to optical module performance in the network equipment.
Accordingly, the present invention also provides a kind of network appliance power-down detection system, comprising: watch-dog, feature coding device, optical signal detector and feature coding detector;
Described watch-dog is arranged in the network equipment, and whether the supply power voltage that is used for monitoring network equipment has unusual decline, if then the command characteristics encoder generates the power-down features coding, and the transmission of regular traffic data is cut off in order at the described network equipment;
Described feature coding device also is arranged in the network equipment, is used for generating the power-down features coding and adopting the full tunnel mode to send to transmission network immediately according to the order of watch-dog;
Described feature coding detector is arranged in the opposite equip. of the transmission network other end, is used for search and receives the power-down features coding;
Described optical signal detector also is arranged in the opposite equip. of the transmission network other end, be used for whether the detected transmission light path light signal disappearance occurs after the feature coding detector receives the power-down features coding, if then trigger the feature coding detector to network management unit reporting ent equipment generation power down fault.
Described optical signal detector also is used for: whether the detected transmission light path light signal disappearance occurs after the feature coding detector receives the power-down features coding, if not, then trigger the feature coding detector to network management unit reporting ent equipment generation power supply transient fault.
Described feature coding detector also is used for the power-down features coding that receives is confirmed, specifically comprise: the power-down features coding of receiving is counted, and whether the power-down features coding that occurs continuously is greater than N, and wherein N is the positive integer more than or equal to 3, if then confirm the power-down features coding.
Compared with prior art, the present invention has the following advantages:
At first, in described network appliance power-down detection method and the system, watch-dog monitors the direct voltage of network equipment power supply, when being lower than setting threshold, discovery cuts off the regular traffic transfer of data immediately, and the command characteristics encoder generates the power-down features coding, described feature coding device adopts the full tunnel mode to send to transmission network immediately described power-down features coding, feature coding detector searches in the transmission network opposite equip. also receives described power-down features coding, then optical signal detector detects the disappearance whether light signal has taken place again, if after detecting the power-down features coding, detected the disappearance of light signal again, can determine that then this light disappearance of signal is caused by the far-end network device powers down, belong to the electric power system outage, the power down fault that power supply thoroughly damages or artificial closing device causes; If do not detect the disappearance of light signal after detecting the power-down features coding, thereby certain unusual voltage decline that causes moment has taken place in the power supply that then can determine equipment; Only do not detect the light disappearance of signal if detect feature coding, then can determine, belong to the transmission cable fault.Can screen out the failure cause of power fail warning so accurately, reliably, be convenient in time take treatment measures.Described system and method is not only the detection of the network equipment outage of far-end, but expand to the power monitoring of far-end network equipment, can screen out electric power system outage, the power supply thoroughly alarm that causes of reasons such as damages and the alarm of power supply transient fault, thereby improve accuracy and the reliability that network appliance power-down is alarmed.
Secondly, described network appliance power-down detection method and system do not have special requirement to the power supply of the network equipment, watch-dog directly is connected with power supply, the output that detects is directly connected to the feature coding device, and when supply voltage descended unusually, the power-down features coding can send immediately.
In addition, after generating the power-down features coding, the transmission of cut-out regular traffic, all passage all is used for sending the power-down features coding, theoretic transmission speed can be faster, do not need network equipment power supply to keep power supply certain hour (need not utilize energy-storage travelling wave tube to prolong the outage back power work time, save equipment cost).And described power-down features coding is not limited to certain byte, and has occupied whole transmission channel, so have 100% uniqueness.
Description of drawings
By the more specifically explanation of the preferred embodiments of the present invention shown in the accompanying drawing, above-mentioned and other purpose, feature and advantage of the present invention will be more clear.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly do not draw accompanying drawing in proportion, focus on illustrating purport of the present invention.
Fig. 1 is the system schematic that network appliance power-down detects in the embodiment of the invention one;
Fig. 2 is the flow chart of network appliance power-down detection method in the embodiment of the invention one;
Fig. 3 is the system schematic that network appliance power-down detects in the embodiment of the invention two;
Fig. 4 is the flow chart of network appliance power-down detection method in the embodiment of the invention two.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
A lot of details have been set forth in the following description so that fully understand the present invention.But the present invention can implement much to be different from alternate manner described here, and those skilled in the art can do similar popularization under the situation of intension of the present invention.Therefore the present invention is not subjected to the restriction of following public concrete enforcement.
Described schematic diagram is an example, and it should not limit the scope of protection of the invention at this.
Embodiment one
This enforcement in conjunction with the accompanying drawings 1 and Fig. 2 disclose a kind of embodiment of described network appliance power-down detection method and system.Fig. 1 realizes the system schematic that network appliance power-down detects in the present embodiment, Fig. 2 is the flow chart of the detection method of network appliance power-down described in the present embodiment.
As shown in Figure 1, the system that detects of network appliance power-down comprises: be arranged on watch-dog 10 in the network equipment, also be arranged on the feature coding device 20 in the network equipment and be arranged on feature coding detector 30 and optical signal detector 40 in the opposite equip. of the transmission network other end.
Wherein, watch-dog 10, the supply power voltage state that is used for monitoring network equipment, because when power down takes place, supply power voltage can pop-off, but have a unusual suddenly process that descends, and watch-dog 10 is caught the unusual decline of power down moment supply power voltage, and command characteristics encoder 20 generates the power-down features coding then.The power supply of the network equipment for example is a DC power supply, and the voltage of 10 pairs of DC power supply of watch-dog detects in real time, and the decline of the moment that notes abnormalities then reports to feature coding device 20 immediately.
Wherein, when unusual decline appearred in the supply power voltage that monitors the network equipment, the network equipment cut off the transmission of regular traffic data, adopted the full tunnel mode to send to transmission network immediately described power-down features coding, did not need power supply to keep the regular hour.Power-down features coding is not limited to certain byte, and has occupied whole passage, even the frame swynchronization code of SDH all tied up, and has 100% uniqueness.
Method flow diagram with reference to network appliance power-down detection shown in Figure 2:
Shown in step 201～step 203, be arranged on the situation of the real-time supervision supply power voltage of watch-dog 10 in the network equipment, detect and unusual decline whether occurs, if find to have unusual decline, then command characteristics encoder 20 is encoded according to setting generation power-down features in advance, this power-down features coding is distinguished mutually with the regular traffic data, as coded system or frequency difference; If no abnormal decline shows that supply power voltage is stable or in normal fluctuation range, then continuation monitors.
When generating the power-down features coding, according to shown in the step 204, the network equipment cuts off the transmission of regular traffic data immediately and adopts the full tunnel mode to send to transmission network immediately described power-down features coding, in other words, feature coding is not limited to certain byte, and has occupied whole passage, like this under the equal conditions, per 125 microseconds can send 155520000 bits, realize the high-speed transfer power fail warning.
Shown in step 205, the feature coding detector 30 that is arranged in the opposite equip. of the transmission network other end is encoded according to coded system or frequency search power-down features from the data of receiving, judge whether to find the power-down features coding according to step 206 then, if, then execution in step 207, further light signal whether occurs by optical signal detector detected transmission light path and disappear; If not, then return step 205 and continue search power-down features coding.
Shown in step 207, whether opposite equip. detected transmission light path light signal occurs disappears, if, then as step 208, to network management unit reporting ent equipment generation power down fault; If not, then as step 209, to network management unit reporting ent equipment generation power supply transient fault.
That is to say, before detecting power-down features and being coded in, after light signal disappears in, then must thoroughly damage for the electric power system outage or the network equipment power supply of the network equipment of far-end; If detect the power-down features coding, do not disappear but detect light signal, show that then the power-down features coding may be the flase drop that is caused by power failure.
Preferably, optical signal detector 40 also is used for: whether the detected transmission light path light signal disappearance occurs after feature coding detector 30 receives the power-down features coding, if not, then trigger feature coding detector 30 to network management unit reporting ent equipment generation power supply transient fault.In other words, if failing to detect light signal after detecting the power-down features coding disappears, the excessive fluctuation of network equipment power supply that then can judge far-end has triggered generation of power-down features coding and transmission, this fluctuation is sporadic, if this sporadic fluctuation appears in continuous several times, cause repeatedly the power-down features coding of flase drop, then belong to the power supply transient fault, and be not to be that electric power system outage or power supply thoroughly damage.So, described system and method is not only the detection of the network equipment outage of far-end, but expands to the power monitoring of far-end network equipment, can screen out the alarm of electric power system outage, the thorough breakage alarming of power supply and power supply transient fault.
In described network appliance power-down detection method of present embodiment and system, watch-dog monitors the direct voltage of network equipment power supply, when being lower than setting threshold, discovery cuts off the regular traffic transfer of data immediately, and the command characteristics encoder generates the power-down features coding, described feature coding device adopts the full tunnel mode to send to transmission network immediately described power-down features coding, feature coding detector searches in the transmission network opposite equip. also receives described power-down features coding, then optical signal detector detects the disappearance whether light signal has taken place again, if after detecting the power-down features coding, detected the disappearance of light signal again, can determine that then this light disappearance of signal is caused by the far-end network device powers down, belong to the power down fault that electric power system outage or artificial closing device cause, be not transmission cable fault or device power supply (DPS) fault, if do not detect the disappearance of light signal after detecting the power-down features coding, thereby certain unusual voltage decline that causes moment has taken place in the power supply that then can determine equipment.Can screen out the failure cause of power fail warning so accurately, reliably, be convenient in time take treatment measures.
Described network appliance power-down detection method and system, not needing does not have special requirement to the power supply of the network equipment, and watch-dog directly is connected with power supply, and the output of detection is directly connected to the feature coding device, when supply voltage was unusual, the power-down features coding can send immediately.
In addition, after generating the power-down features coding, cut off the regular traffic transmission, all passage all is used for sending the power-down features coding, and theoretic transmission speed can be faster, does not need network equipment power supply to keep the power supply certain hour.And described power-down features coding is not limited to certain byte, and has occupied whole transmission channel, so have 100% uniqueness.
Preferably, opposite equip. receives the not sensed light signal disappearance immediately afterwards of power-down features coding, but the setting-up time of being separated by is carried out the step whether sensed light signal disappears again, wherein, described setting-up time is determined according to optical module performance in the network equipment, is designed to for example 1 second-2 seconds by computer program.So, can have than adequate time and wait for power cut-off, avoid the power supply transient fault is caused that the erroneous judgement of power-down features coding is the power down fault.
In fact, because the power-down features coding sends in the equipment voltage change process, therefore possibly can't accurately differentiate business datum when receiving still is the power-down features coding, the error code that causes for fear of this accidentalia, cause false judgment to the power down fault, the present invention also provides a kind of preferred execution mode, specifically describes in following examples.
Embodiment two
Present embodiment in conjunction with the accompanying drawings 3 and Fig. 4 disclose the another kind of embodiment of described network appliance power-down detection method and system.Be that with the difference of embodiment one the feature coding detector is also confirmed the power-down features coding of receiving whether disappear through further again sensed light signal after confirming.
Fig. 3 realizes the system schematic that network appliance power-down detects in the present embodiment, Fig. 4 is the flow chart of the detection method of network appliance power-down described in the present embodiment.
As shown in Figure 3, the system that detects of network appliance power-down comprises: be arranged on watch-dog 11 in the network equipment, also be arranged on the feature coding device 21 in the network equipment and be arranged on feature coding detector 31 and optical signal detector 41 in the opposite equip. of the transmission network other end.
Wherein, watch-dog 11 directly is connected with the DC power supply of the network equipment, whether the supply power voltage that is used for monitoring network equipment has unusual decline, if then command characteristics encoder 21 generates the power-down features coding, and the transmission of regular traffic data is cut off in order at the described network equipment.
Feature coding device 21, be used for sending according to the order generation power-down features coding of watch-dog 11 and to transmission network, preestablish the feature coding that sends when the power down fault takes place, it is the power-down features coding, this coding is distinguished in frequency or coded system mutually with normal business datum, finds thereby make can search in the data of receiving at the detector of the other end.
Feature coding detector 31, be used for search and receive the power-down features coding and feature coding is confirmed, confirm the result whether light signal disappears according to optical signal detector again, send the power down fault warning or the power failure alarm of the network equipment to network management unit.Specifically comprise: the power-down features coding of receiving is counted, and whether the power-down features coding that occurs continuously is greater than N, and wherein N is the positive integer more than or equal to 3, if then confirm the power-down features coding.
Described optical signal detector 41 is used for whether the detected transmission light path light signal disappearance occurs after 31 pairs of power-down features code verifications of feature coding detector, if then trigger feature coding detector 31 to network management unit reporting ent equipment generation power down fault; If not, then trigger feature coding detector 31 to network management unit reporting ent equipment generation power supply transient fault.
Method flow diagram with reference to network appliance power-down detection shown in Figure 4:
Shown in step 401～step 403, the situation of the supervision supply power voltage that the watch-dog 11 in the network equipment is real-time, detect and unusual decline whether occurs, if find to have unusual decline, then command characteristics encoder 21 is encoded according to setting generation power-down features in advance, this power-down features coding is distinguished mutually with the regular traffic data, as coded system or frequency difference; If no abnormal decline shows that supply power voltage is stable or in normal fluctuation range, then continuation monitors.
Power down moment, voltage die was reduced to before zero at voltage, according to shown in the step 404, cut off the transmission of network equipment regular traffic data, adopt the mode of full tunnel to send to transmission network immediately described power-down features coding, be sent to the opposite equip. of opposite side by transmission network by the network equipment.
Shown in step 405, the feature coding detector 31 of opposite equip. that is arranged in the transmission network other end from the data received according to coded system or frequency search and receive the power-down features coding, judge whether to find the power-down features coding according to step 406 then, if, then to being encoded, counts the power-down features of receiving according to step 407, search out a feature coding and be designated as 1, search out once more feature coding accumulative total for 2...... if not, then continue search.
Then according to step 408, whether the power-down features coding that checking occurs continuously is greater than N, N is the positive integer more than or equal to 3, if, then can get rid of the error code that accidental business datum causes, confirm the power-down features coding, continue execution in step 409, whether opposite equip. detected transmission light path light signal occurs disappears; If not, then shown in step 410, show that this feature coding is invalid, counter O reset is returned step 405 then and is continued search power-down features coding.
According to shown in the step 409, whether opposite equip. detected transmission light path light signal occurs disappears, if, then as step 411 to network management unit reporting ent equipment generation power down fault, if not, then as step 412 to network management unit reporting ent equipment generation power supply transient fault.
In the present embodiment, when the power-down features coding that searches continuously more than N, just feature coding is confirmed, report power down fault, if the feature coding less than that searches continuously 3 times, then may be the accidental identical business datum of frequency or coded system and power-down features coding, it is got rid of, thereby further guarantee the reliability of detection of power loss.
Similar with embodiment one, opposite equip. receives the also not sensed light signal disappearance immediately afterwards of power-down features coding, but the setting-up time of being separated by is carried out the step whether sensed light signal disappears again.
Preferably, in the network equipment (being the transmitting terminal of feature coding), when detecting supply voltage and be lower than preset threshold, interrupt regular traffic immediately, use full tunnel to send feature coding; When detecting supply voltage again and be higher than preset threshold, then stop to send feature coding.
In opposite equip. (being the receiving terminal of feature coding), after detecting feature coding, detected light disappearance alarm again, then be judged to be network appliance power-down; Detect light disappearance alarm if do not detect feature coding, then be judged to be the transmission cable fault between the network equipment and the opposite equip.; If only detect accidental feature coding, do not disappear and detect light signal, then be judged to be the power quality deterioration of the network equipment, transient voltage is low excessively, should in time keep in repair.
In two above embodiment, watch-dog interrupts sending the regular traffic data immediately when power down, disturb to avoid signal, and assurance power-down features coding is rapider to send more accurately, can reduce simultaneously requirement, improve the transmission speed of feature coding the power supply hold facility.
Need to prove; generated feature coding in the present embodiment with the business datum different frequency; also can as embodiment one, two, generate feature coding with business datum different coding mode; those skilled in the art should know by inference easily; every can the difference that other modes are set with the regular traffic data; simultaneously can by the feature coding detector searches to feature coding all can realize purpose of the present invention, also belong to protection scope of the present invention.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. a network appliance power-down detection method is characterized in that, comprising:
Steps A: whether the supply power voltage of watch-dog monitoring network equipment has unusual decline, if then the command characteristics encoder generates the power-down features coding;
Step B: when unusual decline appears in the supply power voltage that monitors the network equipment, cut off the transmission of regular traffic data, adopt the full tunnel mode to send the power-down features coding to transmission network immediately;
Step C: the feature coding detector searches in the opposite equip. also receives described power-down features coding;
Step D: opposite equip. receives whether described power-down features coding back detected transmission light path light signal occurs and disappear, if, then to network management unit reporting ent equipment generation power down fault.
2. network appliance power-down detection method according to claim 1 is characterized in that, described step D also comprises: if not, and then to network management unit reporting ent equipment generation power supply transient fault.
3. network appliance power-down detection method according to claim 1 is characterized in that, further comprises step S between step C and step D: the feature coding detector is confirmed the power-down features coding that receives.
4. network appliance power-down detection method according to claim 3, it is characterized in that, confirm among the described step S that the power-down features coding comprises: the power-down features coding of receiving is counted, whether the power-down features coding that occurs continuously is greater than N, and wherein N is the positive integer more than or equal to 3, if, then confirm the power-down features coding, enter step D, if not, then return step C.
5. network appliance power-down detection method according to claim 1 is characterized in that, feature coding device generation power-down features coding comprises in the described steps A: the feature coding device generates the power-down features coding with regular traffic data different frequency.
6. network appliance power-down detection method according to claim 1 is characterized in that, feature coding device generation power-down features coding comprises in the described steps A: the feature coding device generates the power-down features coding with regular traffic data different coding mode.
7. network appliance power-down detection method according to claim 1 is characterized in that, the setting-up time execution in step D again of being separated by after the described step C, and wherein, described setting-up time is determined according to optical module performance in the network equipment.
8. a network appliance power-down detection system is characterized in that, comprising: watch-dog, feature coding device, optical signal detector and feature coding detector;
Described watch-dog is arranged in the network equipment, and whether the supply power voltage that is used for monitoring network equipment has unusual decline, if then the command characteristics encoder generates the power-down features coding, and the transmission of regular traffic data is cut off in order at the described network equipment;
Described feature coding device also is arranged in the network equipment, is used for generating the power-down features coding and adopting the full tunnel mode to send to transmission network immediately according to the order of watch-dog;
Described feature coding detector is arranged in the opposite equip. of the transmission network other end, is used for search and receives the power-down features coding;
Described optical signal detector also is arranged in the opposite equip. of the transmission network other end, be used for whether the detected transmission light path light signal disappearance occurs after the feature coding detector receives the power-down features coding, if then trigger the feature coding detector to network management unit reporting ent equipment generation power down fault.
9. network appliance power-down detection method according to claim 8, it is characterized in that, described optical signal detector also is used for: whether the detected transmission light path light signal disappearance occurs after the feature coding detector receives the power-down features coding, if not, then trigger the feature coding detector to network management unit reporting ent equipment generation power supply transient fault.
10. network appliance power-down detection method according to claim 9, it is characterized in that, described feature coding detector also is used for the power-down features coding that receives is confirmed, specifically comprise: the power-down features coding of receiving is counted, whether the power-down features coding that occurs continuously is greater than N, wherein N is the positive integer more than or equal to 3, if then confirm the power-down features coding.
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| CN102769864A (en) * | 2012-07-26 | 2012-11-07 | 京信通信系统（中国）有限公司 | Alarm processing method and alarm processing system of radio-frequency remote system |
| CN103135733A (en) * | 2012-12-21 | 2013-06-05 | 华为技术有限公司 | Power-down monitoring device, method and controller |
| CN109613452A (en) * | 2018-11-29 | 2019-04-12 | 奥克斯空调股份有限公司 | The power-off protection method of AC power source power failure detection method, DC frequency-changeable compressor |
| CN111162820A (en) * | 2019-12-25 | 2020-05-15 | 烟台芯火集成电路产业研究院有限公司 | Power conversion module and broadband carrier communication module |
| CN112636944A (en) * | 2019-10-09 | 2021-04-09 | 中盈优创资讯科技有限公司 | OLT equipment offline intelligent diagnosis method and system |
| CN114113916A (en) * | 2021-12-13 | 2022-03-01 | 中国电信股份有限公司 | Fault detection system and method |
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