JP7159596B2 - Optical transmission/reception system, optical communication device, and failure detection method - Google Patents

Description

The present invention relates to an optical transmission/reception system, an optical communication device, and a failure detection method.

Conventionally, in servers operating in the field, there are cases where the following measures are taken as failure detection methods. For example, the server acquires log information once a day and stores the collected log in the information storage area. Then, the server analyzes and accumulates the collected logs, and performs failure monitoring of each unit in its own device.

In conventional servers that perform such failure detection, in order to prevent the system from stopping when a sign of failure is detected for an optical module, maintenance of the optical module is often performed before the failure occurs. Common. Therefore, if there is no sign of failure, the optical module can continue to be used without maintenance. Furthermore, when an optical module failure warning is suddenly issued or when a failure occurs, the logs of all optical modules considered to be failure targets are collected at that timing. Then, the collected logs are analyzed, and maintenance of the optical module is performed based on the analysis results.

As a failure detection technique, there is a conventional technique for detecting an abnormal state by comparing a measurement value of an analog sensor and a set value, and changing the period of abnormality detection according to the state. In addition, there is a conventional technique for improving the safety of a system by stopping operation when an abnormality occurs in a device or line in a wireless communication system.

JP-A-06-168342 JP 2009-188766 A

However, in the conventional method of collecting detailed log information of an optical module when a failure is detected or a warning occurs, there is a lack of information for investigating the circumstances leading up to the failure detection or the occurrence of a warning. Therefore, it is difficult to identify the cause of the failure of the optical module. Therefore, the cause of failure is identified by a reproduction test or in light of past failure occurrence conditions. In that case, for example, the reproduction test may take a long time, and it is difficult to easily identify the cause of the failure. In addition, it depends on the skill of the operator to identify the cause of failure from past failure occurrence situations, and there is a risk that the cause of failure cannot be identified reliably.

Therefore, in order to identify the cause of the failure of the optical module, a method of leaving log information on the server until the failure of the optical module is detected is conceivable. In this case, log information is periodically acquired and accumulated for all optical modules, which not only puts a load on the processor that controls the server, but also may reduce the performance of the server. is difficult.

In addition, when using the conventional technology that changes the abnormality detection cycle according to the state of the device, it is difficult to collect information until the failure of the optical module even if the detection cycle is increased. Determining the cause is difficult. Furthermore, even with the conventional technology of stopping operation when an abnormality occurs, it is difficult to collect information up to the failure of the optical module, and it is difficult to identify the cause of the failure of the optical module.

The disclosed technology has been made in view of the above, and aims to provide an optical transmission/reception system, an optical communication device, and a failure detection method that facilitate identification of the cause of failure of an optical module.

In one aspect of the optical transmission/reception system, the optical communication device, and the failure detection method disclosed in the present application, the optical transmission/reception system includes an optical transmission device, an optical reception device connected to the optical transmission device via an optical communication path, and A controller for controlling the optical transmitter and the optical receiver is provided. The control device selects the monitoring target one by one from a plurality of monitoring targets including an optical module of the optical receiving device, and if the selected monitoring target is not an optical module, a first monitoring target related to the selected monitoring target is selected. 1. A log monitoring control unit that acquires information and performs failure prediction and failure detection for the selected monitoring target; and if the monitoring target selected by the log monitoring control unit is an optical module, the selected monitoring target a predictor detection unit that acquires first information about a certain optical module and detects a predictor of failure regarding the optical module based on the obtained first information; an identifying unit that obtains second information about the optical module and identifies a cause of failure about the optical module based on the obtained second information.

In one aspect, the present invention can easily identify the cause of failure of an optical module.

FIG. 1 is a system configuration diagram of an information processing apparatus. FIG. 2 is a block diagram showing the details of the service processor. FIG. 3 is a diagram showing an example of collected RSSI information of an optical module. FIG. 4 is a diagram showing an example of collected temperature information of an optical module. FIG. 5 is a diagram showing an example of BER collected as log information of an optical module. FIG. 6 is a diagram of an example of a monitoring setting table. FIG. 7 is a diagram of an example of a threshold table. FIG. 8 is a diagram showing a determination state when an optical element error is notified. FIG. 9 is a diagram showing the transition of determination states when the occurrence of a compatibility problem is notified. FIG. 10 is a diagram showing the transition of determination states when a multi-port error is notified. FIG. 11 is a flow chart of log monitoring in a normal state. FIG. 12 is a flow chart of detection processing of a sign of failure of an optical module. FIG. 13 is a flowchart of failure cause identification processing.

Embodiments of an optical transmission/reception system, an optical communication device, and a failure detection method disclosed in the present application will be described below in detail with reference to the drawings. The optical transmission/reception system, the optical communication device, and the failure detection method disclosed in the present application are not limited to the following embodiments.

FIG. 1 is a system configuration diagram of an information processing apparatus. As shown in FIG. 1 , the information processing apparatus 1 includes a service processor 10 , CPU (Central Processing Unit) groups 21 and 22 , and an output device 4 . This information processing device corresponds to an example of an "optical transmission/reception system."

Here, in this embodiment, a pair of CPU groups 21 and 22 that perform optical communication has been described as an example, but actually any number of CPU groups may exist. Also, for example, the CPU group 21 may perform optical communication with other than the CPU group 22 . Since the CPU group 21 and the CPU group 22 have the same function, the CPU group 21 will be described below as an example. The CPU groups 21 and 22 correspond to examples of "optical receiver" and "optical transmitter".

The CPU group 21 has a CPU 211 , an optical module 212 , a lens block 213 , a temperature sensor 216 , a transmission side port 217 and a reception side port 218 .

The CPU 211 performs arithmetic processing. The CPU 211 sends data addressed to the CPU 221 to the optical module 212 . The CPU 211 also receives data transmitted from the CPU 221 via the optical module 212 . The CPU 211 can use the received data for arithmetic processing.

The CPU 211 and optical module 212 are connected by a port 219 . One port 219 has four channels. The CPU 211 and the optical module 212 are connected by three ports 219 for transmission and three ports 219 for reception. That is, the CPU 211 has 12 channels as channels for electrical signal transmission to the optical module 212 . The CPU 211 also has 12 channels for receiving electrical signals from the optical module 212 .

Further, the CPU 211 has an ICC (Inter Connect Controller) (not shown). Also, the CPU 211 is connected to the communication unit 13 of the service processor 10 via the bus 5 . The ICC of the CPU 211 obtains a BER (Bit Error Rate), which is an error rate per bit of the received signal. The CPU 211 transmits BER information obtained by the ICC to the service processor 10 in response to a request from the service processor 10 .

The optical module 212 is a device that converts between an electrical signal and an optical signal. The optical module 212 has a lens block 223 and controllers 214 and 215 . Also, the optical module 212 is connected to the communication unit 13 of the service processor 10 via the bus 5 .

The control unit 214 is connected to the CPU 211 through three ports 219 for transmitting electrical signals sent from the CPU 211 . That is, the control unit 214 is connected to the CPU 211 through 12 channels. The control unit 214 receives electrical signals sent from the CPU 211 via the port 219 . The controller 214 then converts the received electrical signal into an optical signal. The controller 214 then transmits the optical signal to the lens block 213 .

The control unit 215 is connected to the CPU 211 through three ports 219 that send electrical signals to the CPU 211 . That is, the control unit 215 is connected to the CPU 211 through 12 channels. The control unit 215 receives optical signals sent from the CPU group 22 from the lens block 213 . The controller 214 then converts the received optical signal into an electrical signal. Then, the control part 215 transmits an electrical signal to CPU211. Also, when receiving an optical signal, the control unit 215 measures RSSI (Received Signal Strength Indication), which is the received signal strength. In response to a request from the service processor 10 , the optical module 212 transmits the result of RSSI measurement by the control unit 215 to the service processor 10 .

The lens block 213 receives the input of the 12-channel optical signals sent from the CPU 211 from the control unit 214 . The lens block 213 converges the acquired optical signal and outputs it to the transmission side port 217 . Also, the lens block 213 receives the input of the 21-channel optical signals sent from the CPU 221 through the receiving port 218 . The lens block 213 converges the acquired optical signal and outputs it to the controller 215 .

The transmission side port 217 is connected to the reception side port 228 in the CPU group 22 by the optical cable 31 . The transmission side port 217 transmits the optical signal input from the lens block 213 to the reception side port 228 via the optical cable 31 .

The receiving port 218 is connected to the transmitting port 227 in the CPU group 22 by the optical cable 31 . The receiving port 218 receives the optical signal transmitted from the transmitting port 227 via the optical cable 32 . The receiving port 218 then outputs the received optical signal to the lens block 213 .

Temperature sensor 216 is connected to service processor 10 via bus 5 . Temperature sensor 216 measures the temperature of optical module 212 . Then, the temperature sensor 216 transmits the measurement result of the temperature of the optical module 212 to the service processor 10 in response to a request from the service processor 10 .

The CPU group 22 has a CPU 221 , an optical module 222 , a temperature sensor 226 , a transmission side port 227 and a reception side port 228 . The optical module 222 has a lens block 223 and controllers 224 and 225 . The CPU 221 and the control units 224 and 225 communicate via six ports 229 each having four channels. Each part of the CPU group 22 operates similarly to each part of the CPU group 21 .

The service processor 10 has a control section 11 , a storage section 12 and a communication section 13 . This service processor 10 corresponds to an example of a "control device". The control unit 11 is a processor core or the like. The storage unit 12 is a storage device such as a memory. The communication unit 13 is an interface for communication with the CPU groups 21 and 22 and the output device 4 .

The communication unit 13 is connected to the CPU 211 and the optical module 212 of the CPU group 21 and to the CPU 221 and the optical module 222 of the CPU group 22 via the bus 5 . Also, the communication unit 13 is connected to the output device 4 via the bus 5 .

The communication unit 13 outputs data received from the control unit 11 via the bus 5 to the output device 4 . Further, the communication unit 13 transmits a request for obtaining BER information output from the control unit 11 to the CPUs 211 and 221 . Then, the communication unit 13 receives BER information from the CPUs 211 and 221 as a response to the transmitted acquisition request. After that, the communication unit 13 outputs BER information in the CPUs 211 and 221 to the control unit 11 .

Further, the communication unit 13 transmits a request to acquire the RSSI information output from the control unit 11 to the optical modules 212 and 222 . Then, the communication unit 13 receives RSSI information from the optical modules 212 and 222 as a response to the transmitted acquisition request. After that, the communication unit 13 outputs RSSI information in the CPUs 211 and 221 to the control unit 11 .

Further, the communication unit 13 transmits a temperature information acquisition request output from the control unit 11 to the temperature sensors 216 and 226 . Then, the communication unit 13 receives the temperature information of the CPUs 211 and 221 from the temperature sensors 216 and 226, respectively, as a response to the transmitted acquisition request. After that, the communication unit 13 outputs temperature information of the CPUs 211 and 221 to the control unit 11 .

The storage unit 12 is a storage device such as memory or hard disk. The storage unit 12 stores a threshold table 121 in which thresholds used in failure sign and failure cause identification processing are registered, and a monitoring setting table 122 indicating whether or not detailed log monitoring is being performed. The threshold table 121 and monitoring setting table 122 will be described later in detail.

FIG. 2 is a block diagram showing the details of the service processor. As shown in FIG. 2 , the control unit 11 has a log monitoring unit 111 and a failure log acquisition unit 115 . Since both the CPUs 211 and 221 have similar functions, the functions of the service processor 10 will be described below using the CPU 211 as an example.

In a normal state, the fault log acquisition unit 115 causes the communication unit 13 to collect log information once a day. The failure log acquisition unit 115 receives from the log monitoring control unit 112 an acquisition request for log information of a monitoring target selected by the log monitoring control unit 112 . The failure log acquisition unit 115 then transmits a log information acquisition request for the monitoring target to the communication unit 13 . Here, the log information includes information such as the load factor of the CPU 211, the rotation speed of the fan, and the temperature of the CPU 211, for example. The log information also includes temperature information of the CPU 211 , RSSI information of the optical module 212 , and BER information of the CPU 211 .

For example, if the target to be monitored is the optical module 212, the failure log acquisition unit 115 acquires the following information. That is, the fault log acquisition unit 115 acquires from the communication unit 13 the RSSI information transmitted from the optical module 212 as shown in FIG. FIG. 3 is a diagram showing an example of collected RSSI information of an optical module. RxCH00 to 11 in FIG. 3 represent reception channels connected to the control unit 215 . That is, as shown in FIG. 3, fault log acquisition section 115 acquires the RSSI of each of the 12 reception channels connected to control section 215 .

Further, the fault log acquisition unit 115 acquires temperature information of the CPU 211 transmitted from the temperature sensor 216 as shown in FIG. 4 from the communication unit 13 . FIG. 4 is a diagram showing an example of collected temperature information of an optical module. The Tx temperature shown in FIG. 4 is the temperature on the transmission side port 217 side of the optical module 212 . Also, the Rx temperature is the temperature on the receiving side port 218 side of the optical module 212 . That is, the fault log acquisition unit 115 acquires the temperature on the transmission side port 217 side and the temperature on the reception side port 218 side of the optical module 212 .

Further, the fault log acquisition unit 115 acquires from the communication unit 13 BER information transmitted from an ICC (Inter Connect Controller) of the CPU 211 as shown in FIG. FIG. 5 is a diagram showing an example of BER collected as log information of an optical module. Ports #1 to #3 in FIG. 5 represent three of the ports 219 connected to the CPU 211 on the receiving side. That is, the fault log acquisition unit 115 acquires the BER for each port 219 on the receiving side. The optical module 212, the temperature sensor 216, and the ICC of the CPU 211 that transmit information to the failure log acquisition unit 115 correspond to an example of the information notification unit.

In addition to this, the failure log acquisition unit 115 also acquires the presence or absence of passage of light. The failure log acquisition unit 115 stores the acquired log information in the log information accumulation area of the storage unit 12 .

Further, as will be described later, when a failure sign is given for the optical module 212 , the failure log acquisition unit 115 receives an instruction to acquire a detailed log from the failure sign detection unit 113 . Then, the failure log acquisition unit 115 acquires the log information of the optical module 212 to be monitored at a log acquisition cycle shorter than once a day. For example, the failure log acquisition unit 115 acquires the log information of the optical module 212 to be monitored once every hour. In this case, since the log information collection interval is shortened, it can be said that the fault log acquisition unit 115 collects more detailed log information than in the normal case. Then, the acquired detailed log information of the monitored optical module 212 is stored in the detailed log storage area of the storage unit 12 indicated by the detailed log storage pointer. After that, the failure log acquisition unit 115 advances the detailed log storage pointer by one. By advancing the storage pointer in this way, the failure log acquisition unit 115 can leave the detailed log information in the storage unit 12 .

The log monitoring control unit 112 has a log monitoring control unit 112 , a failure sign detection unit 113 and a failure cause identification unit 114 .

The log monitoring control unit 112 selects one monitoring target from the parts to be monitored. The log monitoring control unit 112 stores in advance specific information for specifying each part to be monitored. Then, the log monitoring control unit 112 selects one monitoring target from the parts indicated by the stored specific information. Hereinafter, the portion selected as the monitoring target by the log monitoring control unit 112 will be referred to as a “monitoring target portion”. The log monitoring control unit 112 sends a log information acquisition request of the selected monitoring target part to the fault log acquisition unit 115 once a day. After that, the log monitoring control unit 112 refers to the log information stored in the storage unit 12 by the failure log acquisition unit 115 and determines whether or not the optical module 212 is monitored.

If the monitored part is not the optical module 212, the log monitoring control unit 112 determines whether the collected log information is normal. If the log information is not normal, the log monitoring control unit 112 determines whether it is a sign of failure. For example, the log monitoring control unit 112 has in advance a sign determination threshold for determining a failure sign and a failure determination threshold for determining that a failure has occurred. If the threshold value and the log information stored in the storage unit 12 exceed the failure determination threshold value but not the failure determination threshold value, the log monitoring control unit 112 determines that a failure symptom has occurred in the part to be monitored. When a failure sign occurs, the log monitoring control unit 112 causes the output device 4 to report the occurrence of the failure sign of the monitoring target part.

Further, when the state of the monitoring target part is not a failure sign state but a failure state, the log monitoring control unit 112 causes the output device 4 to notify the failure occurrence of the monitoring target part. For example, when the log information stored in the storage unit 12 exceeds a failure determination threshold, the log monitoring control unit 112 determines that a failure has occurred in the monitored part. In this case, the log monitoring control unit 112 causes the output device 4 to notify the failure occurrence of the monitored part.

On the other hand, if the state of the monitored part is neither a failure sign state nor a failure occurrence state, the log monitoring control unit 112 determines that the monitored part is normal. After that, the log monitoring control unit 112 selects the next monitoring target. When log information for all monitored objects has been acquired, the log monitoring control unit 112 ends the process of collecting log information once a day. In this case, the information stored in the storage unit 12 may be accumulated, or may be deleted each time detection of a failure sign and failure of the monitoring target part is completed.

On the other hand, when the monitored part is the optical module 212, the log monitoring control unit 112 instructs the failure sign detection part 113 to detect the failure sign of the optical module 212, which is the monitored part. After that, the log monitoring control unit 112 receives from the failure sign detection unit 113 a notification of the end of the failure sign detection processing for the optical module 212 to be monitored. Then, the log monitoring control unit 112 selects the next monitoring target.

The failure sign detection unit 113 performs failure sign detection for the optical module 212 to be monitored. Specifically, it receives from the log monitoring control unit 112 an instruction to detect a sign of failure of the optical module 212 . Then, the failure sign detection unit 113 refers to the monitoring setting table 122 shown in FIG. FIG. 6 is a diagram of an example of a monitoring setting table. In the monitoring setting table 122 in FIG. 6, when 1 is set as the flag value, the corresponding CPU group 21 or 22 is set with a detailed log flag. For example, when the monitoring target is the optical module 212 , the failure sign detection unit 113 checks the detailed log flag of the CPU group 21 in the monitoring setting table 122 . In FIG. 3, since the value of the detailed log flag of the CPU group 21 is 1, the failure sign detection unit 113 determines that the CPU group 21 is collecting detailed log information. If the detailed log information of the monitored optical module 212 is being collected, the failure predictor detection unit 113 terminates the failure predictor processing.

On the other hand, if the detailed log information of the monitored optical module 212 is not being collected, the failure sign detection unit 113 acquires the threshold table 121 shown in FIG. FIG. 7 is a diagram of an example of a threshold table. Furthermore, the failure sign detection unit 113 acquires the log information of the monitored optical module 212 from the storage unit 12 . Then, the failure sign detection unit 113 compares the threshold table 121 with the acquired log information, and determines that at least one of temperature information is 45 degrees or more, RSSI is less than −2.0 db, or BER is 1e to the 9th power or more. It is determined whether or not the condition is satisfied.

When none of the values in the log information of the monitored optical module 212 satisfies the predictor threshold condition of the threshold table 121, the failure predictor detector 113 determines that the monitored optical module 212 is normal. Then, the failure sign detection unit 113 ends the failure sign detection processing for the optical module 212 to be monitored. After that, the failure sign detection unit 113 notifies the log monitoring control unit 112 of the end of the failure sign detection processing for the optical module 212 to be monitored.

If any of the values in the log information of the monitored optical module 212 satisfies the condition of the predictive threshold in the threshold table 121, the failure predictor detection unit 113 determines that a failure predictor has occurred in the monitored optical module 212. . Then, the failure sign detection unit 113 sets the detailed log flag of the monitored optical module 212 in the monitoring setting table 122 stored in the storage unit 12 to during detailed log collection. In FIG. 6, the detailed log flag of the optical module 212 is already 1, but if the detailed log flag of the optical module 212 is 0, the failure sign detector 113 sets the detailed log flag of the optical module 212 in the monitoring setting table 122 to 1. set to After that, the failure sign detector 113 causes the output device 4 to notify the occurrence of the failure sign of the optical module 212 to be monitored. After that, the failure sign detection unit 113 notifies the log monitoring control unit 112 of the end of the failure sign detection processing of the optical module 212 to be monitored. Furthermore, the failure sign detection unit 113 instructs the failure log acquisition unit 115 to collect detailed log information of the optical module 212 to be monitored.

The failure portent detection unit 113 corresponds to an example of the "prediction detection unit". The log information corresponds to an example of "first information", and the detailed log information corresponds to an example of "second information". Furthermore, once a day, which is the log information monitoring cycle, is an example of the "first cycle", and once an hour, which is the detailed log information monitoring cycle, is an example of the "second cycle". Since the detailed log information has a shorter monitoring interval than the log information, it can be said that the detailed log information contains more information than the log information.

The failure cause identification unit 114 periodically refers to the monitoring setting table 122 stored in the storage unit 12 . For example, the failure cause identification unit 114 checks the detailed log flag of the monitoring setting table 122 once an hour. If the detailed log flag indicating that detailed log information is being collected is not set in the monitoring setting table 122, the failure cause identification unit 114 terminates the failure cause identification process.

On the other hand, if one or several detailed log flags indicating that detailed logs are being collected are set in the monitoring setting table 122, the failure cause identification unit 114, for example, selects the optical module 212 for which the detailed log flag is set as a detailed log flag. Select to monitor.

Next, the failure cause identification unit 114 acquires detailed log information of the optical module 212 to be monitored in detail from the storage unit 12 . Furthermore, the cause-of-failure identification unit 114 acquires the threshold table 121 from the storage unit 12 . Then, the failure cause identification unit 114 compares the detailed log value of the optical module 212 to be monitored in detail with the failure threshold condition of the threshold table 121 .

If the RSSI value in the detailed log is less than −3.0 db, the failure cause identification unit 114 determines that deterioration in the characteristics of the VCSEL (Vertical Cavity Surface Emitting Laser), which is a light emitting element, has occurred, and an error occurs in the light emitting element. and decide. In this case, the cause-of-failure identifying unit 114 causes the output device 4 to notify the light-emitting element error of the optical module 212 to be monitored in detail. Here, as factors leading to light-emitting element errors, optical waveform abnormalities and optical output attenuation due to eye monitor constriction and bias current reduction are conceivable.

On the other hand, if the RSSI value in the detailed log is −3.0 db or more, the failure cause identification unit 114 determines whether the temperature value in the detailed log is 50° C. or more. If the temperature value in the detailed log is less than 50° C., it is determined whether the BER value is 1e to the 6th power or more. If the value of BER is 1e to the 6th power or more, the failure cause identification unit 114 determines the number of bits in which an error occurred with respect to the total number of bits of the digital data signal received during the specified time on the receiving side in the CPU 211. It is determined that the problem is the BIT error rate, which represents the ratio of . Then, the cause-of-failure identification unit 114 determines that the abnormality that has occurred is a compatibility problem. In this case, the cause-of-failure identifying unit 114 causes the output device 4 to notify the occurrence of the compatibility problem of the optical module 212 targeted for detailed monitoring. Here, as a factor leading to the occurrence of the compatibility problem, an influence such as a defect of the optical module 222 on the communication partner side can be considered. For example, when the BER of the optical module 222 on the other side is 1e to the 10th power, which is just before warning, an abnormality may occur in the optical module 212 . Such a situation may occur when the optical module 222 of the other party is replaced.

On the other hand, if the RSSI value in the detailed log is −3.0 db or more, the failure cause identification unit 114 determines whether the temperature value in the detailed log is 50° C. or more. If the temperature value in the detailed log is 50° C. or more, it is determined whether the BER value is 1e to the 6th power or more. If the BER value is 1e to the 6th power or more, the failure cause identification unit 114 determines that 3 ports of the port 219 have failed due to the failure of the control unit 215 that receives data, and determines a multi-port error. In this case, the cause-of-failure identifying unit 114 causes the output device 4 to notify the multiple-port error of the optical module 212 targeted for detailed monitoring. Here, as factors leading to a multiple port error, it is conceivable that wiring shorts of the flexible substrate on which the control unit 215 is mounted due to growth crystals of copper called dendrites or lack of synchronization signals are considered. Hereinafter, the notification of the light-emitting element error, the occurrence of the compatibility problem of the optical module 212, and the multiple port error by the failure cause identification unit 114 will be collectively referred to as "failure cause notification".

This failure cause identification unit 114 corresponds to an example of the “identification unit”. The RSSI and temperature of the optical module 212 and the BER of the CPU 211, which are collected once per hour, correspond to an example of "status information."

Returning to FIG. 1, the description continues. The output device 4 provides information to the administrator of the information processing device 1 . For example, the output device 4 is a monitor, a printer, or the like. The output device 4 receives an instruction from the service processor 10 to report the occurrence of a failure sign and information on the cause of failure. Then, the output device 4 notifies the administrator by displaying a message such as a failure sign warning and failure cause information on a monitor or the like.

Next, with reference to FIGS. 8 to 10, the transition of determination state in each failure cause notification will be described. FIG. 8 is a diagram showing the transition of determination states when an optical element error is notified. FIG. 9 is a diagram showing the transition of determination states when the occurrence of a compatibility problem is notified. FIG. 10 is a diagram showing the transition of determination states when a multi-port error is notified.

Consider the case where the optical element error shown in FIG. 8 is notified. When the optical module 212 is normal, the failure sign detector 113 detects that the RSSI of the optical module 212 is -1.9 db or more, the temperature is less than 45° C., and the BER of the CPU 211 is less than 1e to the 9th power. In this case, since the optical module 212 is normal, the failure sign detection unit 113 determines that no failure sign has occurred, and maintains the detection cycle of the failure sign as once a day.

When an optical element error is detected, the failure sign detector 113 first detects that the RSSI of the optical module 212 is less than -1.9 db, as shown in the failure sign column of FIG. Then, the failure predictor detection unit 113 notifies that a failure predictor has occurred, changes the log monitoring cycle to once an hour, and starts collecting detailed log information.

After that, the failure cause identification unit 114 monitors the optical module 212 using the detailed log information, and detects that the RSSI of the optical module 212 is less than -3.0 as described in the column of failure detection in FIG. To detect. On the other hand, the failure cause identification unit 114 confirms that the temperature and BER are within normal ranges. Then, the failure cause identification unit 114 determines that an optical element error has occurred based on the determination result that the temperature and BER are normal and the RSSI is abnormal, and notifies.

Next, let us consider the case where the occurrence of the compatibility problem of the optical module 212 shown in FIG. 9 is notified. When the optical module 212 is normal, the failure sign detection unit 113 determines that the RSSI of the optical module 212 is -1.9 db or more, the temperature is less than 45° C., and the BER of the CPU 211 is less than 9th power of 1e, as in the case of FIG. is detected. In this case, since the optical module 212 is normal, the failure sign detection unit 113 determines that no failure sign has occurred, and maintains the detection cycle of the failure sign as once a day.

When a compatibility problem is detected, first, the failure sign detection unit 113 detects that the BER of the CPU 211 is 1e to the 9th power or more, as shown in the failure sign column in FIG. Then, the failure predictor detection unit 113 notifies that a failure predictor has occurred, changes the log monitoring cycle to once an hour, and starts collecting detailed log information.

After that, the failure cause identification unit 114 monitors the optical module 212 using the detailed log information, and detects that the BER of the CPU 211 is 1e to the 6th power or more as described in the failure detection column of FIG. . On the other hand, the cause-of-failure identifying unit 114 confirms that the RSSI and temperature are within normal ranges. Then, the cause-of-failure identification unit 114 determines that an optical element error has occurred based on the determination result that the RSSI and temperature are normal and the BER is abnormal, and notifies.

Next, let us consider a case where a multi-port error of the optical module 212 shown in FIG. 10 is notified. When the optical module 212 is normal, the failure sign detection unit 113 determines that the RSSI of the optical module 212 is -1.9 db or more, the temperature is less than 45° C., and the BER of the CPU 211 is less than 9th power of 1e, as in the case of FIG. is detected. In this case, since the optical module 212 is normal, the failure sign detection unit 113 determines that no failure sign has occurred, and maintains the detection cycle of the failure sign as once a day.

When a multi-port error is detected, the failure sign detector 113 first detects that the temperature of the optical module 212 is 45° C. or higher and the BER of the CPU 211 is 1e to the 9th power, as shown in the failure sign column of FIG. Detect that it is more than Then, the failure predictor detection unit 113 notifies that a failure predictor has occurred, changes the log monitoring cycle to once an hour, and starts collecting detailed log information.

After that, the failure cause identification unit 114 monitors the optical module 212 using the detailed log information, and as described in the column of failure detection in FIG. 1e to the 6th power or more is detected. On the other hand, failure cause identification section 114 confirms that RSSI is within a normal range. Then, based on the determination result that the RSSI is normal and the temperature and BER are abnormal, the failure cause identification unit 114 determines that a multiple port error has occurred and notifies.

Next, a normal flow of log monitoring will be described with reference to FIG. FIG. 11 is a flow chart of log monitoring in a normal state. The log monitoring shown in FIG. 11 is performed once a day. Here, the optical modules 212 and 222 are referred to as the optical module 202 without distinction.

The log monitoring control unit 112 selects one monitoring target that has not yet been determined in the current log monitoring process from the predetermined parts (step S1). Then, the log monitoring control unit 112 notifies the fault log acquisition unit 115 of an instruction to collect the log of the selected monitoring target.

The failure log acquisition unit 115 receives from the log monitoring control unit 112 an instruction to collect logs to be monitored. Then, the failure log acquisition unit 115 collects log information about the monitoring target once a day (step S2).

After that, the failure log acquisition unit 115 stores the acquired log information of the monitoring target part in the information accumulation area of the storage unit 12 (step S3).

The failure sign detection unit 113 acquires log information of the monitoring target part from the information accumulation area of the storage unit 12 . Then, the failure sign detection unit 113 determines whether or not the monitored object is the optical module 202 (step S4).

If the monitored object is not the optical module 202 (step S4: NO), the failure sign detection unit 113 determines whether or not the log information of the monitored part is normal (step S5). Here, log information is not normal, that is, is abnormal means that any of the collected log information is determined to be abnormal, and includes abnormal information that does not serve as a criterion for determining signs of failure. If the log information is normal (step S5: affirmative), the failure sign detection unit 113 proceeds to step S11.

On the other hand, if there is an abnormality in the log information (step S5: No), the failure sign detection unit 113 uses the acquired log information to determine whether or not a failure sign has occurred in the monitored part ( step S6).

If there is a failure sign state (step S6: affirmative), the failure sign detection unit 113 causes the output device 4 to issue a warning about the failure sign of the monitoring target portion (step S7). After that, the failure sign detection unit 113 proceeds to step S11.

On the other hand, if there is no failure sign state (step S6: No), the failure sign detection unit 113 determines whether or not a failure has occurred in the monitored part (step S8). Here, when it is not in the failure sign state, it also includes a state in which a failure has already occurred beyond the failure sign state.

If no failure has occurred (step S8: No), the failure sign detection unit 113 proceeds to step S11. On the other hand, if a failure has occurred (step S8: affirmative), the failure sign detection unit 113 causes the output device 4 to notify the failure occurrence of the monitoring target part (step S9). After that, the failure sign detection unit 113 proceeds to step S11.

On the other hand, if the object to be monitored is the optical module 202 (Yes at step S4), the failure portent detection unit 113 executes failure portent detection processing for the optical module 202 (step S10). After that, the failure sign detection unit 113 proceeds to step S11.

The failure sign detection unit 113 notifies the log monitoring control unit 112 of the completion of determination of the monitoring target part. The log monitoring control unit 112 receives the notification of the completion of the determination of the monitoring target part and determines whether or not acquisition of the log information of all the monitoring targets has been completed (step S11).

If there is a monitoring target for which log information has not been obtained (step S11: NO), the log monitoring control unit 112 returns to step S1. On the other hand, if acquisition of log information for all monitoring targets has been completed (step S11: affirmative), the log monitoring control unit 112 ends the log monitoring processing for that day.

Next, with reference to FIG. 12, processing for detecting a sign of failure of the optical module 202 will be described. FIG. 12 is a flow chart of detection processing of a sign of failure of an optical module. The failure sign detection process shown in FIG. 12 corresponds to an example of the process executed in step S10 in FIG.

The failure sign detection unit 113 refers to the monitoring setting table 122 and determines whether or not detailed log information is being collected for the optical module 202 to be monitored (step S101). If the detailed log information is being collected (step S101: Yes), the failure sign detection unit 113 terminates the failure sign detection processing assuming that a failure sign has already been detected for the optical module 202 to be monitored.

On the other hand, if the detailed log information has not been collected (step S101: No), the failure sign detection unit 113 stores the log information including the temperature and RSSI of the monitored optical module 202 and the BER of the corresponding CPU 211 or 221 in the storage unit 12. (step S102).

Next, the failure sign detector 113 compares the temperature of the monitored optical module 202 with the sign threshold registered in the threshold table 121 to determine whether the temperature of the monitored optical module 202 is the failure sign temperature. (step S103). Here, the failure sign temperature is a temperature indicating a failure sign.

If the temperature is not the failure portent temperature (step S103: No), the failure portent detector 113 compares the RSSI of the monitored optical module 202 with the portent threshold registered in the threshold table 121. FIG. Then, the failure predictor detection unit 113 determines whether or not the RSSI of the monitored optical module 202 is the failure predictor RSSI (step S104). Here, the failure sign RSSI is an RSSI indicating a failure sign.

If the RSSI is not the failure predictor RSSI (step S104: No), the failure predictor detector 113 compares the BER of the CPU 211 or 221 corresponding to the optical module 202 to be monitored with the predictor threshold registered in the threshold table 121. Then, the failure portent detector 113 determines whether or not the BER of the CPU 211 or 221 corresponding to the monitored optical module 202 is the failure portent BER (step S105). Here, the failure sign BER is a BER indicating a failure sign.

If the BER is not the failure sign BER (step S105: No), the failure sign detection unit 113 determines that no failure sign has occurred in the optical module 202 to be monitored, and terminates the failure sign detection processing.

On the other hand, if the temperature is the failure predictor temperature (step S103: positive), if the RSSI is the failure predictor RSSI (step S104: positive), or if the BER is the failure predictor BER (step S105: positive), the failure predictor is detected. The unit 113 performs the following processing. That is, the failure sign detection unit 113 sets a detailed log flag to the optical module 202 to be monitored in the monitoring setting table 122 (step S106).

After that, the failure sign detection unit 113 causes the output device 4 to notify the existence of the failure sign regarding the optical module 202 to be monitored (step S107). Then, the failure predictor detection unit 113 terminates the failure predictor detection processing.

Next, the flow of failure cause identification processing by the failure cause identification unit 114 will be described with reference to FIG. FIG. 13 is a flowchart of failure cause identification processing. The cause-of-fault identification process shown in FIG. 13 is periodically performed at a period shorter than once a day, such as once an hour.

The failure cause identification unit 114 selects one optical module 202 to be monitored, which has not yet been determined in the current failure cause identification process, from among the optical modules 202 to be monitored (step S201).

Next, the failure cause identification unit 114 checks the detailed log flag indicating collection of detailed log information in the monitoring setting table 122, and determines whether or not detailed log information is being collected for the optical module 202 to be monitored. (Step S202). If the detailed log information has not been collected (step S202: No), no sign of failure has occurred in the optical module 202 to be monitored, so the failure cause identification unit 114 terminates the failure cause identification process.

On the other hand, if the detailed log information is being collected (step S202: affirmative), the fault log acquisition unit 115 collects the detailed log information of the optical module 202 to be monitored, Store at the position indicated by the log storage pointer (step S203).

Then, the failure log acquisition unit 115 advances the detailed log storage pointer in the information storage area of the storage unit 12 by one (step S204).

The failure cause identification unit 114 acquires the detailed log of the monitored optical module 202 stored in the storage unit 12 . Then, the failure cause identification unit 114 determines whether or not the RSSI of the monitored optical module 202 is less than -3.0 db (step S205).

If the RSSI is less than −3.0 db (Yes at step S205), the state is the same as that shown in FIG. (step S206).

On the other hand, if the RSSI is -3.0 or more (step S205: No), the failure cause identification unit 114 determines whether the temperature of the monitored optical module 202 is less than 50° C. (step S207). .

If the temperature is 50° C. or higher (step S207: No), the failure cause identification unit 114 determines whether the BER of the CPU 211 or 221 corresponding to the optical module 202 to be monitored is 1e to the 6th power or higher (step S208). ).

If the BER is less than 1e to the 6th power (step S208: No), the failure cause identification unit 114 causes the output device 4 to report an optical element error for the optical module 202 to be monitored (step S206).

On the other hand, if the BER is 1e to the 6th power or more (step S208: affirmative), the state is the same as that shown in FIG. The output device 4 is notified (step S209).

On the other hand, if the temperature is less than 50° C. (step S207: affirmative), the failure cause identification unit 114 determines whether the BER of the CPU 211 or 221 corresponding to the optical module 202 to be viewed is 1e to the 6th power or more ( step S210). If the BER is less than 1e to the 6th power (step S201: No), the failure cause identification unit 114 determines that no failure has occurred in the optical module 202 to be monitored, and proceeds to step S212.

On the other hand, if the BER is 1e to the 6th power or more (step S210: affirmative), the state is the same as that shown in FIG. is generated by the output device 4 (step S211).

After that, the cause-of-failure identification unit 114 determines whether or not confirmation of all the optical modules 202 to be monitored has been completed (step S212). If there is an optical module 202 for which confirmation has not been completed (step S212: No), the cause-of-failure identifying unit 114 proceeds to step S201.

On the other hand, if confirmation of all optical modules 202 to be monitored has been completed (step S212: YES), the failure cause identification unit 114 terminates the current failure cause identification processing.

As described above, the information processing apparatus according to the present embodiment starts collecting detailed log information when a sign of failure of an optical module is detected, and uses the detailed log information to detect and detect failure of the optical module. Identify the cause. As a result, the administrator can grasp the cause of the failure of the optical module by receiving the notification of the cause of the failure, and can identify the cause of the failure without performing complicated processing such as a reproduction test. Further, since the cause of the failure is specified by the information processing device, a uniform determination result can be obtained without relying on the administrator's determination. Furthermore, since detailed log information is collected after a failure sign occurs, the load on the information processing apparatus can be reduced. Since detailed log information is accumulated after the occurrence of a sign of failure, the administrator can use the detailed log information in dealing with the failure, and can take a more appropriate action than using normal log information. be able to.

1 information processing device 4 output device 5 bus 10 service processor 11 control unit 12 storage unit 13 communication unit 21, 22 CPU groups 31, 32 optical cable 111 log monitoring unit 112 log monitoring control unit 113 failure sign detection unit 114 failure cause identification unit 115 Fault log acquisition unit 121 Threshold table 122 Monitoring setting table 211, 221 CPU
202, 212, 222 optical module 213, 223 lens block 214, 215, 224, 225 controller 216, 226 temperature sensor 217, 227 transmission side port 218, 228 reception side port 219, 229 port

Claims (8)

An optical transmission/reception system comprising an optical transmission device, an optical reception device connected to the optical transmission device via an optical communication path, and a control device for controlling the optical transmission device and the optical reception device,
The control device is
selecting the monitoring target one by one from a plurality of monitoring targets including an optical module of the optical transmission device, and obtaining first information about the selected monitoring target when the selected monitoring target is not the optical module; a log monitoring control unit that performs failure prediction and failure detection of the selected monitoring target;
When the monitoring target selected by the log monitoring control unit is the optical module, first information about the selected monitoring target optical module is acquired, and based on the acquired first information, the optical module is a sign detection unit that detects a sign of failure related to the module;
an identifying unit that acquires second information about the optical module when the predictor detecting unit detects a failure predictor, and identifies a cause of failure regarding the optical module based on the obtained second information. An optical transmission/reception system characterized by: the first information about the optical module to be monitored is information representing the state of the optical module;
2. The optical transmission/reception system according to claim 1, wherein said second information has a larger amount of information than said first information regarding said optical module. The sign detection unit collects the first information about the optical module to be monitored in a first period,
3. The specifying unit collects the first information about the optical module to be monitored in a second period shorter than the first period, and uses the information as the second information. The optical transmission/reception system according to . The specifying unit compares a plurality of different types of status information included in the second information with a predetermined threshold value for each of the status information, and based on individual comparison results or a combination of each comparison result 4. The optical transmission/reception system according to any one of claims 1 to 3, wherein the cause of failure is identified. an optical receiver that receives an optical signal transmitted from an optical transmitter using an optical communication path;
The monitoring target is selected one by one from a plurality of monitoring targets including an optical module of the optical receiving device, and if the selected monitoring target is not the optical module, first information about the selected monitoring target is obtained. a log monitoring control unit that performs failure prediction and failure detection of the selected monitoring target;
When the monitoring target selected by the log monitoring control unit is the optical module, first information about the selected monitoring target optical module is acquired, and based on the acquired first information, the An instruction from a control device to detect a failure sign relating to an optical module, and to acquire second information relating to the optical module when the failure sign is detected, and to identify a cause of failure relating to the optical module based on the acquired second information. and an information notification unit that receives the first information or the second information and transmits the first information or the second information to the control device. selecting the monitoring target one by one from among a plurality of monitoring targets including an optical module possessed by an optical receiving device connected to the optical transmitting device via an optical communication path ;
if the selected monitoring target is not the optical module, obtaining first information about the selected monitoring target, performing failure sign and failure detection of the selected monitoring target;
if the selected monitoring target is the optical module, obtaining first information about the optical module that is the selected monitoring target;
detecting a failure sign, which is a sign of failure of the optical module , based on the acquired first information about the optical module;
if it is determined that there is a sign of failure, obtaining second information about the optical module ;
A failure detection method, comprising identifying a cause of a failure related to the optical module based on the obtained second information. An optical transmission/reception system comprising an optical transmission device, an optical reception device connected to the optical transmission device via an optical communication path, and a control device for controlling the optical transmission device and the optical reception device,
The control device is
a sign detection unit that acquires first information about the optical receiving device and detects a failure sign relating to the optical receiving device based on the acquired first information;
When a failure sign is detected by the sign detection unit, second information containing at least information on the received signal strength and bit error rate of the optical receiving device is acquired, and the received signal strength and bit error rate of the optical receiving device are obtained. and an identifying unit that identifies a cause of failure of the optical receiving device based on the optical transmitting and receiving system. The identification unit receives the second information including information on the received signal strength, temperature and bit error rate of the optical receiver, and determines the cause of failure in the order of the received signal strength, the temperature and the bit error rate. 8. The optical transmitting/receiving system according to claim 7, wherein the cause of the failure is specified in accordance with the order of determination, any one of a compatibility problem, a multiple port error, and an optical element error.

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