JP5160525B2 - Failure information device - Google Patents

Description

  The present invention relates to a failure information device that manages history information for identifying the cause of a failure alarm occurring in a transmission device or the like.

  In general, when a malfunction or failure alarm occurs in a transmission device or the like, the maintenance person must identify the cause. However, since malfunctions and failure alarms that occur due to external noise are not frequently generated, investigations often end without being able to elucidate the cause as an unreproduced failure. Therefore, there is a need for a failure information device that can easily identify the cause of device malfunction and failure alarm.

  On the other hand, in a digital signal circuit used in a transmission device or the like, a method for detecting impulsive noise caused by external induction or the like has been considered (for example, see Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 06-350411 JP 2008-283122 A

  The following reasons can be considered as factors that cause a long-term investigation of malfunctions and failure alarms caused by external noise.

(1) Difference in reproduction environment Since the actual system operation environment on the customer side and the reproduction environment of the cause of failure on the manufacturer side are different, the generation conditions and timing of external noise are greatly different, and in most cases the same phenomenon It is difficult to reproduce.

(2) Difficult to specify external noise contamination route External noise includes conduction noise (EMI, electromagnetic wave noise) and radiation noise such as cosmic rays on power lines, ground lines, communication lines, etc. Since there are a wide variety of mixed routes, it is difficult to investigate and reproduce them.

(3) Difficult to capture external noise To identify the cause of external noise, it is important to accurately capture external noise when a malfunction occurs in the device. With the existing capturing method used, it is difficult to accurately capture external noise when single noise or frequency and level changes.

(4) It is difficult to prove the causal relationship in time series When investigating the cause in a situation where it is unknown whether external noise is the cause or not, clarify the causal relationship between the occurrence of external noise and the occurrence of malfunction or failure alarm on the device. It is necessary to. However, conventionally, since these pieces of information are not associated on the same time axis, there is a problem that they are missed as accidental events of unknown cause.

  Commonly considered causes of device failures are, for example, circuit failures, component failures, software bugs, or external noise. However, as described above, a device failure due to external noise often cannot be reproduced like a circuit failure, component failure, or software bug. For this reason, when a failure alarm (alarm) is temporarily generated from the transmission device due to external noise, the cause cannot be identified and the alarm is treated as an unknown cause, and the device manufacturer loses the user's trust. End up.

  In this way, the occurrence of external noise is difficult to predict and the frequency of occurrence is low, so the cause cannot be caught by waiting. On the other hand, a circuit that detects external noise such as power supply noise is considered, but the alarm that the transmission device itself detects and outputs a communication error is different from the power supply noise detection. Generation and power supply noise detection could not be correlated.

  In view of the above problems, an object of the present invention is to provide a failure information device that can easily identify the cause of malfunction or failure of a device and failure alarm information that are caused by external noise.

The invention according to claim 1 is a failure information device for managing failure information of a device having a plurality of circuits in which external noise may be mixed, wherein the device managed by the failure information device outputs failure alarm information If it is, recorded in time series and detecting means for detecting the presence of external noise for each of the plurality of circuits, and a detection history of the external noise due to output history and the detection means fault alarm of the device in the same format Recording means and external output means for integrating the external noise detection history and the failure alarm output history recorded in time series in the same format on the same time axis and outputting them to an external output device are provided. It is characterized by that.

  According to a second aspect of the present invention, in the failure information device according to the first aspect, the detection means includes a monitoring means for monitoring a predetermined signal for each circuit, and a normal value holding means for holding a normal value of the predetermined signal. And a comparison determination unit that determines that there is external noise when the difference between the level of the predetermined signal monitored by the monitoring unit and the normal value held by the normal value holding unit is equal to or greater than a preset threshold value. It is characterized by.

  The failure information device according to the present invention is provided with detection means for detecting noise by comparing a plurality of noise mixed route signals with normal values, and the occurrence history of the external noise and the failure alarm history of the device are the same. By associating on the time axis, it is possible to easily identify the cause of the malfunction or malfunction of the device caused by external noise and the failure alarm.

It is a block diagram which shows the whole structure of the failure information apparatus 101 which concerns on 1st Embodiment. It is explanatory drawing which shows an example of the log | history format of a failure alarm. It is explanatory drawing which shows an example of the history format of an external noise. It is explanatory drawing which shows an example of the log | history format which arranged the failure alarm and the external noise in time series order. It is explanatory drawing which shows an example which displays visually the history of a failure alarm and external noise in time series order. 3 is a block diagram illustrating a configuration example of a signal conversion unit 103 and an external noise detection unit 104. FIG. It is explanatory drawing which shows the acquisition method of the normal pattern of external noise, and the determination method of external noise. It is a flowchart which shows the acquisition process of the normal pattern of external noise. It is a flowchart which shows the determination process of external noise. It is a block diagram which shows the structural example of signal conversion part 103 'and external noise detection part 104'.

  Hereinafter, embodiments of a “failure information device” according to the present invention will be described in detail with reference to the drawings. The failure information device 101 according to the present embodiment is a device for identifying the cause of a failure that occurs in the transmission device 100. Here, the device failure includes not only a state in which the device completely stops operating but also an event notification such as a state in which an alarm is temporarily output due to a sudden increase in packet errors and system switching. The cause of such a device failure is caused by, for example, a circuit failure, component failure, software bug or external noise, but the device failure due to external noise is reproduced as a circuit failure, component failure or software bug. There are many cases where this is not possible. Therefore, the failure information apparatus 101 according to the present embodiment can visually and objectively confirm the alarm detection and the generation of the external noise by associating the generation of the external noise and the detection of the alarm on the time axis. It is like that.

  Hereinafter, a failure information apparatus 101 provided in the transmission apparatus 100 will be described as an embodiment of the failure information apparatus according to the present invention. FIG. 1 is a block diagram illustrating a configuration of a transmission apparatus 100 including a failure information apparatus 101 according to the present embodiment. In FIG. 1, a transmission apparatus 100 includes a failure information apparatus 101 and a main apparatus 102 that performs normal transmission processing. For example, when the transmission apparatus 100 is a router, the main apparatus 102 performs routing control according to destinations of packets transmitted and received between the upper network and the lower network. In the present embodiment, the configuration and operation related to the transmission processing of the main device 102 are not directly related to the present invention, and thus detailed description thereof is omitted, and the configuration of the failure information device 101 will be described in detail. However, the main device 102 has a failure alarm DB (database) 201 for accumulating a history of failure alarms (alarms) used in the prior art, and the failure information device 101 has a failure captured in the failure alarm DB 201. It refers to the history of information.

  In FIG. 1, a failure information apparatus 101 includes a plurality of signal conversion units 103, an external noise detection unit 104, a noise information processing unit 105, a history information accumulation processing unit 106, a failure alarm accumulation DB (database) 107, And an external output unit 108. When a specific signal conversion unit among the n signal conversion units 103 is indicated, codes 1 to n are added as in the signal conversion unit 103 (1) and the signal conversion unit 103 (n). When it is described as the signal conversion unit 103, it indicates that the content is common to n pieces. Hereinafter, each part is demonstrated in order.

  The signal conversion unit 103 is connected to, for example, a power supply line or a ground line supplied to the main apparatus 102, or a plurality of signal lines to the upper network of the main apparatus 102 or a plurality of signal lines to the lower network, etc. The signal is converted into a signal that is easy to detect.

  The external noise detection unit 104 determines whether or not external noise has occurred in the signals output from the plurality of signal conversion units 103. The external noise detection unit 104 includes, for example, a comparison circuit 151, a determination unit 152, and a normal value holding unit 153. The comparison circuit 151 is held in the output of each signal conversion unit 103 and the normal value holding unit 153. The signal conversion unit 103 is compared with a normal signal pattern. Then, the determination unit 152 determines the comparison result of the comparison circuit 151 and determines whether or not external noise has occurred. The processing of the external noise detection unit 104 such as the normal value holding unit 153 will be described in detail later.

  The noise information processing unit 105 converts the external noise detected by the external noise detection unit 104 into history information in a predetermined format. In this process, the code conversion unit 161 refers to the conversion table 162 and translates the date and time of occurrence (such as the package number and interface number of the device monitored by the signal conversion unit 103) into a predetermined code, Every time the occurrence or recovery of external noise is detected, the history information is converted into one described in a predetermined format. Here, as the predetermined format, the same format as the format in which the failure alarm history is stored in the failure alarm DB 201 on the main apparatus 102 side is used. For example, as the predetermined format, CAPNET generally used as a format for accumulating a failure history is known. In this embodiment, external noise detected by the external noise detection unit 104 using the same CAPNET code as the failure alarm DB 201 is used. Is converted into history information of the CAPNET code.

  Here, an example of history information recorded in a predetermined format such as a CAPNET code will be described. First, FIG. 2 shows an example of history information stored in the existing failure alarm DB 201 that stores a history of failure alarms on the main device 102 side. In FIG. 2, a history is described for each type and situation of an alarm (ALM) indicating a failure alarm, and LOG_No is given in order of the history. Then, as history information, information indicating the date and time of occurrence and the location is described. In the example of FIG. 2, the LOG_No indicating the history order, the date and time of history occurrence, the station name code indicating the station name, the device code indicating the device, the rack number indicating the pedestal number, the PKG_No indicating the package number, and the interface number are shown. IF_No and the like are stored as history information for each alarm.

  In FIG. 2, CV, LOS, EQPT, switching, and the like are described as examples of the type of device alarm (alarm) (ALM type). CV (Code Violation) means an error in bit information as one of PM (Performance) information. Bits are garbled, but the error is corrected and the device is in operation, but the alarm is not generated. There is no state. When a bit corruption continues for a certain period, a LOS (Loss of signal) alarm, which is one of line faults, is generated. That is, CV is an alarm preceding the LOS. Further, EQPT (Equipment) is an alarm that is output when one of the device alarms indicates a device failure. For example, a specific function stops operating due to a component failure or the device itself malfunctions. The switching is an event notification (corresponding to an alarm) that occurs when the transmission apparatus is switched from the active system to the standby system, for example. This is because a general transmission device requires a stable operation, so it has a redundant configuration with a standby system separately from the active system. For example, when the operation of the active system becomes unstable, It is necessary to switch from the standby system to the standby system. At this time, a switching event notification is made.

  In FIG. 2, the occurrence or restoration is described as the alarm status. This is history information indicating the occurrence or recovery of the alarm described in the alarm type, and it is possible to know when the alarm generated in the same place has been recovered.

  As described above, the failure alarm DB 201 on the main device 102 side that has been used conventionally is an example of history information of failure alarms accumulated.

  On the other hand, the noise information processing unit 105 of the failure alarm device 101 according to the present embodiment creates external noise history information as shown in FIG. 3 in the same format as the failure alarm history information of FIG. In FIG. 3, as in FIG. 2, LOG_No indicating the history order, history occurrence date and time, station name code indicating the station name, device code indicating the device, rack number indicating the cradle number, PKG_No indicating the package number, IF_No indicating an interface number is described for each history information. In the case of FIG. 3, the external noise type and the noise occurrence status are described in the alarm type and alarm status column of FIG. 2, and stored as external noise history information in the noise information accumulation DB 163 of the history information accumulation processing unit 106. . In the example of FIG. 3, optical noise generated in the optical signal line as external noise and power supply noise generated in the power supply line are described, and ON or OFF is described as the occurrence state of each noise. Here, ON indicates that the external noise detection unit 104 has detected noise (noise generation), and OFF indicates that the noise detected by the external noise detection unit 104 has not been detected (noise recovery).

  The history information accumulation processing unit 106 stores the external noise history information described by the CAPNET code output from the noise information processing unit 105 in the noise information accumulation DB (database) 163 in chronological order. On the other hand, the history information accumulation processing unit 106 refers to the history of the conventional failure alarm output from the main device 102 from the failure alarm accumulation DB 201. In FIG. 1, the history of the conventional failure alarm output from the main device 102 is stored in the failure alarm storage DB 201 in a separate system. However, as shown by the dotted line, the history information storage processing unit 106 A failure alarm history may be received from the main apparatus 102 and stored in the failure alarm storage DB 201.

  The external output unit 107 is an interface that receives the noise history information and the failure history information from the history information accumulation processing unit 106, rearranges the noise history information and the failure history information in time series, and outputs them to the outside. In particular, the failure information apparatus 101 according to the present embodiment visually outputs noise history information and failure history information rearranged in time series. The output destination may be output on a monitor screen, or may be printed on paper and output.

  Here, an example of the output format of the external output unit 107 will be described. As an example of the output format, for example, the failure history information accumulated in the failure alarm DB 201 shown in FIG. 2 and the external noise history information accumulated in the noise information accumulation DB 163 shown in FIG. Created history information. An example of this is shown in FIG. FIG. 4 shows history information in the same format in which the failure history information of FIG. 2 and the external noise history information of FIG. 3 are integrated in chronological order. Similar to FIGS. 2 and 3, LOG_No indicates A *** for failure history information, and B *** indicates external noise history information. In the example of FIG. 4, since the occurrence date is the same 9/17, the failure history information and the external noise history information are rearranged in the order of time stored in the time column.

  The external output unit 107 displays a table as shown in FIG. 4 on the monitor screen or prints it on paper according to the operation of the maintenance operator. Then, the operator can see from the table of FIG. 4 which external noise is the cause of the alarm, or what noise is the external noise. For example, an alarm (CV) with history number A001 occurs at time 13:10:05. Then, it can be seen that an alarm (LOS) occurred at time 13:11:13, and subsequently, an event notification for switching from the active system to the standby system was performed at time 13:11:25. The history up to this point can be verified only with the conventional failure alarm history information described with reference to FIG. 2, but it is difficult to verify why the alarm (CV) at time 13:10:05 occurred. However, in the failure information apparatus 101 according to the present embodiment, external noise history information as shown in FIG. 3 is accumulated in the noise information accumulation DB 163 and integrated on the same time axis as the failure alarm history of FIG. The integrated history information as shown in FIG. 6 is created, so that the occurrence of optical noise is detected at the same location in the same station at time 13:10:03 immediately before the alarm (CV) at time 13:10:05, for example. I understand. Thus, the operator can determine that the alarm (CV) at time 13:10:05 was caused by the occurrence of optical noise. Similarly, in FIG. 4, the recovery of the alarm (CV) at time 13:13:01 is because the optical noise disappears at the same location in the same station at the previous time 13:12:52. It can be determined that the alarm (CV) has been recovered by disappearance. Note that the integrated history information of FIG. 4 may be created by the history information storage processing unit 106 and stored in the noise information storage DB 163.

  Similarly, in the case of power supply noise, the occurrence of an alarm (EQPT) at time 13:16:03 is detected in the same place at the same station at the time 13:16:02 immediately before in FIG. Thus, it can be determined that an alarm (EQPT) has occurred due to the occurrence of power supply noise. Similarly, for the recovery of the alarm (EQPT) at time 13:17:12, the power supply noise disappears at the same location of the same station at the previous time 13:17:01. It can be determined that the alarm (EQPT) has been recovered.

  In the above description, an example in which the integrated history information obtained by integrating the failure history and the noise history as shown in FIG. 4 is displayed on the monitor screen or printed on paper as a table rearranged in time series is shown. Further, as shown in FIG. 5, the operator may be able to visually discriminate. In Fig. 5, the horizontal axis indicates the time axis, the vertical axis indicates the alarm type and noise type, the alarm occurrence time and recovery time are indicated by vertical arrows, and the alarm type and alarm status are indicated together. Similarly, ON (occurrence) and OFF (disappearance) are displayed with vertical arrows, and the cause of the failure alarm can be easily specified by writing the noise type and the noise state together. At this time, if the period in which the noise is generated is indicated by a horizontal double arrow (an arrow indicated by a dotted line), it becomes easier to understand visually.

  In this way, the failure information device 101 according to the present embodiment detects the occurrence of external noise by providing the external noise detection unit 104 that monitors the signals of a plurality of noise-mixed routes and compares them with a normal pattern, By integrating on the same time axis as the detection of the failure alarm, the failure alarm and the occurrence of the external noise are visualized in association with each other in chronological order, and the cause of the failure alarm can be identified objectively and easily.

  The above is the overall configuration and operation of the failure information apparatus 101 used in the transmission apparatus 100 according to the present embodiment.

[Example of external noise detection of signal line]
Next, configuration examples and operations of the signal conversion unit 103 and the external noise detection unit 104 when monitoring the signal line of the transmission apparatus 100 will be described in detail. FIG. 6 shows a configuration example when the signal line of the optical fiber of the transmission device 100 is monitored by the signal conversion unit 103 (n) and the external noise detection unit 104 detects whether or not external noise has occurred in the monitored optical signal. Is shown.

  In FIG. 6, the optical signal input to the main device 102 is branched by the coupler 301 and input to the signal conversion unit 103 (n) of the failure information device 101. The optical signal input to the signal conversion unit 103 (n) is converted into an analog electrical signal corresponding to the amount of light by a PD (photodiode) 302. The PD 302 is composed of, for example, an avalanche photodiode having a high light receiving sensitivity and a high response speed, and a predetermined reverse bias voltage is applied from the reverse bias voltage unit 303. The analog electrical signal output from the PD 302 is amplified by the preamplifier 304, converted to a digital signal by the A / D conversion unit 305, and output to the external noise detection unit 104.

  As described briefly above, the external noise detection unit 104 includes the comparison circuit 151, the determination unit 152, and the normal value holding unit 153.

  The comparison circuit 151 compares the output signal of the signal conversion unit 103 (n) with the normal signal pattern of the optical signal held in the normal value holding unit 153. A normal acquisition method will be described in detail later.

  The determination unit 152 determines whether or not the comparison result of the comparison circuit 151 satisfies a preset condition, and determines that external noise has occurred when the preset condition is not satisfied. The determination method will be described in detail later.

  The normal value holding unit 153 takes in and holds a normal signal pattern of the optical signal monitored by the signal conversion unit 103 (n) in advance and outputs it to the comparison circuit 151.

  Here, an example of the signal pattern of the optical signal is shown in FIG. FIG. 7A is a graph with the wavelength λ (nm) on the horizontal axis and the signal power P (dBm) on the vertical axis, and shows the spectrum of the optical signal monitored by the signal conversion unit 103 (n). The comparison circuit 151 measures the signal power P at a measurement point of a preset waveform. The measurement points are a plurality of points having different wavelengths. In the example of FIG. 7A, six measurement points from n1 to n6 are set. The comparison circuit 151 acquires a normal signal pattern of the optical signal at such a measurement point and stores it in the normal value holding unit 153. The comparison circuit 151 may acquire a normal signal pattern when the transmission apparatus 100 is installed, or may automatically update the signal pattern at a predetermined date and time set in advance. Alternatively, the normal signal pattern may be acquired and updated at all times.

  Next, normal signal pattern acquisition processing will be described with reference to the flowchart of FIG. Note that the processing of the flowchart of FIG. 8 is executed automatically by the comparison circuit 151 by internal software.

  (Step S101) The comparison circuit 151 starts a signal pattern acquisition process at the normal time. At this time, the sampling count m is initialized to zero.

  (Step S102) Whether or not a device alarm has occurred on the main device 102 side is confirmed. This is done to avoid obtaining a normal pattern when a device alarm is occurring.

  (Step S103) As a result of checking in step S102, if a device alarm has occurred, the process proceeds to step S104. If a device alarm has not occurred, the process proceeds to step S105.

  (Step S104) Wait until the device alarm is restored. Then, the process returns to step S102.

  (Step S105) The comparison circuit 151 samples the digital signal output from the signal conversion unit 103 and converts it into a signal spectrum of a wavelength. And signal power is measured for every wavelength of the measurement point demonstrated previously, and it memorize | stores in an internal buffer. For example, the signal power at each measurement point is stored in the buffer such as wavelength n1: -25 dBm, wavelength n2: -15 dBm, wavelength n3: -10 dBm, wavelength n4: -10 dBm, wavelength n5: -20 dBm, wavelength n6: -35 dBm. Is done. These values are stored for each sample. For example, the signal power of the wavelength n1 at the first sampling is expressed as n1 (1), and the signal power of the wavelength n1 at the mth sampling is expressed as n1 (m). . The same applies to the wavelengths n2 to n6.

  (Step S106) It is determined whether or not the number of samplings m in step S105 has reached a specified value (ma). If m <ma, the process returns to step S105, and if m = ma, the process proceeds to step S107.

(Step S107) The comparison circuit 151 calculates an average value for each measurement point of the signal power measured for each sampling in Step S105. For example, the average value n1_ave at the measurement point of the wavelength n1 is calculated as (Expression 1).
n1_ave = (n1 (1) + n1 (2) + n1 (3) +... + n1 (m)) / m (Formula 1)
Similarly, the average value for every measurement point from wavelengths n1 to n6 is calculated.

  (Step S108) The average values (n1_ave, n2_ave, n3_ave, n4_ave, n5_ave, n6_ave) for all the measurement points from wavelengths n1 to n6 calculated in step S107 are stored in the normal value holding unit 153 as a normal pattern. For example, as shown in FIG. 7B, an average value signal pattern 351 stored in the normal value holding unit 153 is obtained. Here, in practice, a range of ± 5 dBm, for example, is provided with the average value signal pattern 351 as a reference, and if it is within that range, it is determined to be normal. In the example of FIG. 7B, the upper limit value is the signal pattern 352 and the lower limit value is the signal pattern 353 with respect to the average value signal pattern 351.

  (Step S109) The comparison circuit 151 acquires a normal signal pattern and ends a series of processes.

  In this way, the comparison circuit 151 obtains a normal signal pattern. Note that the latest normal signal pattern may always be acquired by resetting the sampling count m and returning to step S102 without ending the processing in step S109. Thereby, even when the signal pattern changes with time, an accurate signal pattern can be acquired and the signal pattern stored in the normal value holding unit 153 can be updated.

  Next, noise generation detection processing of the external noise detection unit 104 will be described using the flowchart of FIG. It is assumed that the processing of the flowchart of FIG. 9 is automatically executed by the comparison circuit 151 and the determination unit 152 by internal software.

  (Step S201) The comparison circuit 151 starts a noise generation detection process. At this time, the comparison number counter (comparison number) m is initialized to 0, and the mismatch counter C is initialized to 0.

  (Step S <b> 202) The comparison circuit 151 takes in the waveform data of the optical signal from the signal conversion unit 103.

  (Step S <b> 203) The comparison circuit 151 converts the optical signal captured in Step S <b> 202 into a signal spectrum of a wavelength and compares it with the normal signal pattern stored in the normal value holding unit 153. At this time, comparison is made for each measurement point used when acquiring a normal signal pattern. For example, in the example of the signal spectrum of FIG. 7, comparison is made at six measurement points from n1 to n6. If it is within the range between the upper limit value and the lower limit value shown in FIG. 7B, it is determined that the pattern matches the normal pattern, and the process proceeds to step S205. If it is not within the range, the pattern does not match the normal pattern. And the process proceeds to step S204. If any of the six measurement points from n1 to n6 exceeds the upper limit value or the lower limit value, it is determined that there is a mismatch. For example, in the example of FIG. 7C, since the signal power of n3 is larger than the upper limit signal pattern 352, it is determined that there is a mismatch.

  (Step S204) The comparison circuit 151 adds one mismatch counter C.

  (Step S205) The comparison circuit 151 determines whether or not the number of comparisons m has reached a specified value (ma). If m <ma, the process returns to step S202. If m = ma, the process proceeds to step S206.

  (Step S206) The comparison circuit 151 determines whether or not the mismatch counter C has reached a specified value (Ca). If C <Ca, the process proceeds to step S208. If C ≧ Ca, the process proceeds to step S207.

  The processing from step S201 to step S206 is the processing of the comparison circuit 151. And the process after step S207 is a process of the determination part 152. FIG. For ease of explanation, the comparison circuit 151 and the determination unit 152 are described as separate blocks. However, the determination circuit 152 may be processed by the comparison circuit 151.

  (Step S207) The determination unit 152 determines that wavelength noise (external noise) has occurred because the mismatch counter C is greater than the specified value Ca from the comparison result of the comparison circuit 151 in step S206.

  (Step S208) The determination unit 152 determines from the comparison result of the comparison circuit 151 in step S206 that the mismatch counter C is less than the specified value Ca, so that wavelength noise (external noise) is not generated. If the state is a state where wavelength noise is occurring, the process proceeds to step S210, and if the previous state is a state where wavelength noise is not occurring, the process proceeds to step S212. This process is performed to determine whether or not the wavelength noise has been recovered.

  (Step S209) The determination unit 152 determines that the wavelength noise has been recovered. Then, the process proceeds to step S210.

  (Step S <b> 210) The determination unit 152 outputs noise generation or restoration determination information to the noise information processing unit 105.

  (Step S211) The determination unit 152 resets the mismatch counter C to 0 for the next determination process. Further, the comparison number counter (comparison number) m is also reset to zero.

  (Step S212) The determination unit 152 ends a series of determination processes.

  In this way, the comparison circuit 151 and the determination unit 152 compare the signal monitored by the signal conversion unit 103 with the normal signal pattern held in the normal value holding unit 153, and whether or not external noise has occurred. Can be determined.

[Example of external noise detection of power line or ground line]
In the previous example, the case where the external noise is determined by monitoring the optical signal has been described. However, the external noise can be similarly determined not only for the signal line but also for the power supply line and the ground line. For example, FIG. 10 is a diagram illustrating a configuration example of the signal conversion unit 103 ′ (n) when detecting external noise in the case of a power supply line. The signal conversion unit 103 ′ (n) has a different configuration from the signal conversion unit 103 (n) that monitors the optical signal described above.

  In FIG. 10, the signal line signal conversion unit 103 ′ (n) converts the power supply voltage branched from the power supply line 350 supplied from the power supply to the main device 102 into a predetermined voltage by the range amplifier 351, and then a plurality of BPFs. The AC component is converted into a DC component by the AC-DC converter 353 through the (band pass filter) 352. In addition, when referring to one specific BPF among the k BPFs 352, a code from 1 to k is added as in BPF352 (1) and BPF352 (k), and is simply described as BPF352. This indicates that the content is common to k BPFs.

  The plurality of BPFs 352 are BPFs (band pass filters) for extracting a predetermined frequency band of the signal of the power supply line to be monitored. Note that only one BPF 352 (1) may be used instead of a plurality of BPFs 352. Thereby, the clock frequency used in the internal circuit of the transmission apparatus 100 can be removed, and the detection accuracy of external noise due to lightning strikes is improved.

  The AC-DC conversion unit 353 is configured by a rectifier circuit corresponding to high-frequency components such as noise, and also converts sudden AC components into DC components and outputs them to the external noise detection unit 104 '.

  The external noise detection unit 104 ′ is configured in the same manner as the external noise detection unit 104 described above, and includes a comparison circuit 151 ′, a determination unit 152 ′, and a normal value holding unit 153 ′.

  The comparison circuit 151 ′ compares the output signal of the signal conversion unit 103 ′ (n) with the normal value of the power signal held in the normal value holding unit 153 ′.

  The determination unit 152 'determines whether or not the comparison result of the comparison circuit 151' satisfies a preset condition, and determines that external noise has occurred when the preset condition is not satisfied.

  The normal value holding unit 153 'takes in and holds the normal value of the power supply signal monitored by the signal conversion unit 103' (n) in advance and outputs it to the comparison circuit 151 '.

  Note that the value acquisition process at the normal time can be acquired in the same manner as in the flowchart of FIG. 8, and when the alarm is not generated, the output of the signal conversion unit 103 ′ (n) is acquired a predetermined number of times to obtain the average value. It is obtained and stored in the normal value holding unit 153 ′ as a normal value when monitoring the power line.

  Also, the processing for detecting the occurrence of noise on the power supply line can be performed in the same manner as the flowchart of FIG. 9 described above, and the normal value holding unit 153 ′ holding the normal pattern instead of the normal pattern in step S203. Compare with the value. Thereby, it can be determined that noise has occurred in the power supply line in step S207, and it can be determined in step S209 that the noise generated in the power supply line has been recovered. Here, when comparing with the normal value of the power supply line in step S203, the range of the upper limit value and the lower limit value is provided for the normal value as in the case of the optical signal line described above, and the signal conversion unit 103 ′ (n) If the output signal is within this range, it may be determined as a match, and if it is outside the range, it may be determined as a mismatch.

  In this way, it is possible to detect external noise generated in the power supply line as well as the optical signal line. As with the power line, the ground line can be reliably detected by monitoring the high frequency component of the ground line and comparing it with the value obtained during normal operation.

  In particular, the failure information apparatus 101 according to the present embodiment, as described above with reference to FIG. 4 or FIG. ) To detect the occurrence of external noise and integrate them on the same time axis as the detection of the alarm, thereby visualizing the alarm detection and the generation of the external noise in association with each other. Identification can be done.

  The failure information apparatus 101 according to the present invention has been described with reference to the embodiments. However, the failure information apparatus 101 can be implemented in various other forms without departing from the spirit or main features thereof. For this reason, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The present invention is defined by the claims, and the present invention is not limited to the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Transmission apparatus 101 ... Fault information apparatus 102 ... Main apparatus 103 ... Signal conversion part 104 ... External noise detection part 105 ... Noise information processing part 106 ... History information storage process Unit 107 ... Failure alarm storage DB (database)
108 ... external output unit 151 ... comparing circuit 152 ... determining unit 153 ... normal value holding unit 161 ... code conversion unit 162 ... conversion table 163 ... noise information storage DB
201 ... Failure alarm DB (database)
301 ... coupler 302 ... PD (photodiode)
303 ... Reverse bias voltage unit 304 ... Preamplifier 305 ... A / D conversion unit 350 ... Power line 351 ... Range amplifier 352 ... BPF (band pass filter)
353 ... AC-DC converter

Claims (2)

In a failure information device that manages failure information of a device having a plurality of circuits that may be mixed with external noise,
When the device managed by the failure information device is a device that outputs failure alarm information,
Detecting means for detecting the presence or absence of external noise for each of the plurality of circuits;
Recording means for recording the time series and the detection history of the external noise at the same format by output history and the detection means fault alarm of the device,
An external output means is provided for integrating the detection history of the external noise and the output history of the failure alarm recorded in time series in the same format on the same time axis and outputting them to an external output device. Failure information device. The failure information device according to claim 1,
The detection means includes
Monitoring means for monitoring a predetermined signal for each circuit;
Normal value holding means for holding a normal value of the predetermined signal;
Comparing and determining means for determining the presence of external noise when the difference between the level of the predetermined signal monitored by the monitoring means and the normal value held by the normal value holding means is greater than or equal to a preset threshold value. Failure information device.

Images