JP5174687B2 - Optical transmission module and status information storage method - Google Patents

Description

  The present invention relates to an optical transmission module and a state information storage method.

  If the optical transmission module is used outside the specification range, it may break down. The optical transmission module is provided with a function to acquire information such as the operating status and operating environment of the component, and the acquired information is recorded to analyze the cause of the failure. It may be useful for. For example, the following Patent Document 1 describes a technique for recording a minimum value and a maximum value of various monitor data indicating the operation state of each part of an optical transmission module in a nonvolatile memory.

JP 2006-319893 A

  However, in the conventional technique, the frequency of writing the minimum value and the maximum value to the nonvolatile memory increases. Therefore, if the process is waited until the writing is completed, the processing speed is reduced and the nonvolatile memory is overwritten. There were problems such as the maximum number of times being easily reached.

  An object of the present invention is to provide an optical transmission module and a state information storage method in which the number of times of writing to a memory for storing state information indicating the operation state of each part of the optical transmission module is reduced.

  In order to achieve the above object, an optical transmission module according to the present invention includes a detection unit that monitors a state of each part of the optical transmission module and detects each value of one or more state information, and the one or more states. A plurality of predetermined value ranges are set for each information, and a storage means for associating and storing a flag indicating whether or not state information corresponding to each set range is detected, and detected by the detection means For each status information value, if the flag indicating that the status information value is detected in the storage means is larger or smaller than any range stored in association with the status information value, the status information value Updating means for updating a range flag.

  In one aspect of the present invention, for each value of the state information detected by the detection means, a determination is made as to whether or not an abnormal state has occurred by comparing the value of the state information with a predetermined threshold value. And a flag indicating that the state information value is detected in the storage means when the determination means determines that an abnormal condition has occurred, and When it is larger or smaller than any of the stored ranges, the flag in the range corresponding to the value of the state information is updated.

  In one embodiment of the present invention, the storage means is a nonvolatile memory.

  The state information recording method according to one aspect of the present invention sets a plurality of predetermined value ranges for one or a plurality of state information detected by monitoring the state of each part of the optical transmission module, A state information storage method for storing state information of an optical transmission module including storage means for storing a flag indicating whether or not state information corresponding to each set range has been detected. A detection step of monitoring the state of each unit to detect each value of one or a plurality of state information, and for each value of the state information detected by the detection step, the value of the state information is detected in the storage means An update step of updating a flag in a range corresponding to the value of the state information when a flag indicating that the flag is larger or smaller than any of the ranges stored in association with each other. And butterflies.

  According to one aspect of the present invention, it is possible to reduce the number of times of writing to the storage unit that stores the maximum value and the minimum value of the state information detected from each part of the optical transmission module.

  According to one aspect of the present invention, it is possible to reduce the number of times of writing to a storage unit that stores a maximum value and a minimum value of state information detected when an abnormal state occurs.

  According to one aspect of the present invention, the information on the maximum value and the minimum value of the state information can be stored even when the system of the optical transmission module is restarted.

It is a functional block diagram of the optical transmission module concerning this embodiment. It is a figure which shows an example of a state value storage table. It is a flowchart of a state value preservation | save process.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments (hereinafter referred to as embodiments) for carrying out the invention will be described with reference to the drawings.

  FIG. 1 shows a functional block diagram of an optical transmission module 10 according to the present embodiment. As shown in FIG. 1, the optical transmission module 10 includes an optical transmission unit 20, an optical reception unit 30, and a state information storage circuit 40, and each unit may be formed on a printed circuit board. The optical transmission module 10 is connected to the power supply circuit 60 through power supply wiring, and operates by receiving power supply from the power supply circuit 60.

  The optical transmission unit 20 includes an LD (laser diode) and a transmission circuit including a drive circuit that drives the LD by supplying current, and transmits an optical signal modulated according to transmission data from the LD. .

  The optical receiving unit 30 includes a light receiving element that receives an optical signal and a receiving circuit including a waveform shaping circuit that shapes a waveform of a photocurrent output according to the optical signal received by the light receiving element. Received data is obtained by receiving a signal. Note that a PD (photodiode), an APD (avalanche photodiode), or the like may be used as the light receiving element.

  The state information storage circuit 40 generates an abnormal state based on various state information such as the operation state of the optical transmission unit 20 and the optical reception unit 30 of the optical transmission module 10 and the power supply voltage supplied from the power supply circuit 60. And a maximum value and a minimum value of the various state information when an abnormal state occurs in the optical transmission module 10. As shown in FIG. 1, in this embodiment, the state information storage circuit 40 includes a power supply monitoring circuit 42, a temperature sensor 44, an AD conversion unit 46, an abnormal state determination unit 48, an abnormality detection alarm setting unit 50, a state value document. Include a state control unit 52, a state value storage unit 54, and a state value write threshold setting unit 56. Details of each part will be described below.

  The power supply monitoring circuit 42 monitors the power supply voltage value supplied to the optical transmission module 10 from the power supply circuit 60. If the monitored power supply voltage value is not within a predetermined range, an abnormality detection is performed. An alarm signal corresponding to an abnormality in the power supply voltage value is set in the alarm setting unit 50. The power monitoring circuit 42 may monitor the power supply voltage value supplied to each of the optical transmitter 20 and the optical receiver 30.

  The temperature sensor 44 detects the temperature of the light transmission module 10, and the temperature to be detected may be the temperature inside the case of the light transmission module 10 or the temperature of the printed circuit board.

  The AD conversion unit 46 converts analog data (MODTEMPMON) representing the temperature detected by the temperature sensor 44 and various analog data representing the operation state of the optical transmission unit 20 and the optical reception unit 30 into digital data. is there. For example, in addition to MODTEMPMON detected by the temperature sensor 44, the AD conversion unit 46 includes a bias current (LsBIASMON) input to the LD, an optical output power from the LD (LsPOWMON), an LD temperature (LsTEMPMON), and Analog data such as optical input power (RxPOWMON) to the optical receiver 30 may be converted into digital data. The AD conversion unit 46 outputs the converted digital data to the abnormal state determination unit 48.

  The abnormal state determination unit 48 determines whether or not an abnormal state has occurred in the optical transmission module 10 based on various state information converted into digital data by the AD conversion unit 46. Specifically, the abnormal state determination unit 48 includes an abnormal state threshold value storage unit 48A and a comparison unit 48B, which will be described later, and performs a determination process for occurrence of the abnormal state.

  The abnormal state threshold storage unit 48A stores a predetermined threshold (abnormal state threshold) in association with each of various state information. The abnormal state threshold value may be determined based on the specification of the optical transmission module 10, and may be represented by a lower limit value and / or an upper limit value. The lower limit here is a value that determines that an abnormal condition has occurred when the lower limit value is exceeded, and the upper limit value is that an abnormal condition has occurred when the upper limit value is exceeded. Value. The abnormal state threshold storage unit 48A is configured by a non-volatile memory such as a flash memory or a ROM, and the stored contents of the abnormal state threshold storage unit 48A are not erased even when the system of the optical transmission module 10 is restarted.

  The comparison unit 48B compares the value of the state information input to the abnormal state determination unit 48 with the abnormal state threshold of the state information stored in the abnormal state threshold storage unit 48A, and the value of the input state information is Outputs the comparison result of whether or not there is an abnormal state. For example, when an abnormal state threshold of an upper limit value is stored in the abnormal state threshold storage unit 48A for certain state information, the comparison unit 48B compares the value input for the state information with the abnormal state threshold, and inputs An alarm signal is output when the measured value exceeds the abnormal state threshold. Note that the comparison unit 48B may sequentially perform comparison processing on digital data sequentially input from the AD conversion unit 46.

  The abnormality detection alarm setting unit 50 receives an input from the power monitoring circuit 42 or the abnormal state determination unit 48 and sets an alarm signal indicating an abnormal state occurring in the optical transmission module 10. Specifically, the abnormality detection alarm setting unit 50 stores an error flag (LsBIASALM, LsPOWALLM, LsTEMPALM, RxPOWALM, etc.) indicating the occurrence of an alarm for each status information (LsBIASMON, LsPOWMON, LsTEMPMON, RxPOWMON, etc.). The error flag corresponding to the determined state information is set by switching from “OFF (1)” to “ON (0)”.

  The state value writing control unit 52 receives input from the abnormal state determination unit 48 and the abnormality detection alarm setting unit 50, and controls processing to store the value of the state information determined as an abnormal state in the state value storage unit 54. To do. In the present embodiment, the state value write control unit 52 uses a state value storage table stored in a state value storage unit 54 to be described later and a write threshold set by the state value write threshold setting unit 56. Whether or not to write the value of the state information to the state value storage unit 54 is determined, and the writing of the value of the state information is executed according to the determined result.

  The state value storage unit 54 is configured by a nonvolatile memory such as a flash memory, and stores a maximum value and / or a minimum value of each state information. In the present embodiment, the state value storage unit 54 stores a state value storage table in which flags are associated and stored for each range of state information values, and the state information values reach by rewriting the flags. I am going to memorize the range that I did.

  FIG. 2 shows an example of the state value storage table. FIG. 2 shows a table for storing the temperature values detected by the temperature sensor 44. As shown in FIG. 2, the state value storage table includes items for address, bit number, range, and flag. It is constructed by associating. The address indicates the address in the non-volatile memory, the bit number indicates the identification information of each bit included in the address, the range indicates the range of the value of the status information, and the flag indicates whether the status information has reached the associated range Boolean value indicating whether or not. For example, in the initial state, each flag is stored as “OFF (1)”. If the range of the obtained state information enters “55 degrees to 56 degrees”, the “0th” bit is set to “ON (0)”. Furthermore, if “59 degrees to 60 degrees” is entered, the bits from “0th to fourth” may be rewritten to “ON (0)”.

  In the above-described state value storage table, each range is made uniform, but the range may not be made uniform, and the range for which accuracy is required may be narrowed. Further, the state value storage unit 54 may hold the state value storage table for each state information.

  The state value writing threshold value setting unit 56 sets a threshold value (writing threshold value) for determining whether or not to write the value (state value) of the state information stored in the state value storage unit 54 to the state value storage unit 54. Is. Specifically, the state value write threshold setting unit 56 refers to the range in which the flag of the state value storage table is “ON (0)”, and sets the upper limit (or lower limit) value of the range as the write threshold. Is set as

  For example, in the temperature-related state value storage table shown in FIG. 2, if the 0th to 4th flags are “ON (0)” and the fifth and subsequent flags are “OFF (1)”, the state The value writing threshold value setting unit 56 refers to the state value storage table and uses “60 degrees” that is the boundary value between the fourth range and the fifth range at the boundary where the flag value changes as the writing threshold value. It may be set and stored in a memory (volatile memory). Note that a RAM (random access memory) may be used as the volatile memory. Then, the state value writing control unit 52, when the temperature data input from the abnormal state determination unit 48 exceeds the writing threshold “60 degrees” stored in the state value writing threshold setting unit 56 Is determined to write a state value in the state value storage unit 54, and if not exceeded, it is determined not to write.

  Moreover, the state value write threshold value setting unit 56 sets the abnormal state threshold value stored in the abnormal state threshold value storage unit 48A as the write threshold value when no state information is stored in the state value storage unit 54. That's good.

  Next, the flow of the state value storing process performed by the optical transmission module 10 will be described with reference to the flowchart of the state value storing process shown in FIG.

  As shown in FIG. 3, in the optical transmission module 10, status information (analog data) of each unit is acquired (S 101), and the acquired status information (analog data) is converted into a status value (digital data) by the AD conversion unit 46. Conversion is performed (S102). Next, the optical transmission module 10 compares each converted state value with the threshold value stored in the abnormal state threshold value storage unit 48A to determine whether or not an abnormal state has occurred (S103). If it is determined that it has not occurred (S103: N), the process is terminated, and if it is determined that it has occurred (S103: Y), the following process is performed.

  The optical transmission module 10 sets an error flag corresponding to the state information in which the occurrence of the abnormal state is determined in the abnormal state detection alarm setting unit (S104). Then, the optical transmission module 10 compares the write threshold set in the state value write threshold setting unit 56 with the state value obtained for the state information, and the state value is stored in the state value storage unit 54. It is determined whether it is within the range of the stored state value (S105). The writing threshold value may be read in advance or may be read before the determination in S105. When the optical transmission module 10 determines that the state value is within the range (S105: Y), the optical transmission module 10 ends the process without writing the state value and determines that the state value is not within the range. (S105: N), the following processing is performed.

  The optical transmission module 10 specifies a range including the acquired state value (S106), and rewrites the flag value corresponding to the specified range to “ON (0)” (S107). At this time, the optical transmission module 10 may rewrite all flag values corresponding to a range included between the acquired state value and the currently stored state value to “ON (0)”. Specifically, in the state value storage table shown in FIG. 2, when the 0th flag value is “0” and the other flag values are “1”, the state value “59.5 degrees” is acquired. Then, all the first to fourth flag values may be rewritten to “0”.

  Next, the optical transmission module 10 updates the writing threshold set in the state value writing threshold setting unit 56 based on the updated state value storage table (S108), and ends the process. For example, in the above example, “60 degrees” that is the upper limit of the range of the fourth flag value is set as the new write threshold.

  According to the optical transmission module 10 according to the present embodiment described above, the maximum value and the minimum value of the state information indicating the state of each part of the optical transmission module 10 are not directly written in the state value storage unit 54 that is a nonvolatile memory. Instead, by updating the flag value within a predetermined range of state values and storing the arrival point of the state value, the state value can be stored without overwriting the data stored in the nonvolatile memory. Thus, by reducing the number of times of writing and overwriting of the nonvolatile memory, it is possible to shorten the processing time for writing to the nonvolatile memory and avoid the restriction due to the upper limit number of times of writing to the nonvolatile memory. can do.

  In addition, this invention is not limited to said embodiment. For example, in the above embodiment, the abnormal state determination unit 48 and the state value write control unit 52 are configured separately, but the determination unit that determines the occurrence of the abnormal state and the writing of the state value of the abnormal state The determination unit for determination may be shared. Further, when the state value is stored in the state value storage unit 54, the alarm type set in the abnormal state detection alarm setting unit may be stored in association with the state value. Further, a configuration may be provided in which a communication interface is provided in the optical transmission module 10 and an error flag set by the abnormal state detection alarm setting unit is output to an external device. In addition, it goes without saying that various changes, modifications, and substitutions can be made without departing from the scope of the present invention.

  10 optical transmission module, 20 optical transmission unit, 30 optical reception unit, 40 status information storage circuit, 42 power supply monitoring circuit, 44 temperature sensor, 46 AD conversion unit, 48 abnormal state determination unit, 48A abnormal state threshold storage unit, 48B comparison Unit, 50 abnormality detection alarm setting unit, 52 state value write control unit, 54 state value storage unit, 56 state value write threshold setting unit, 60 power supply circuit.

Claims (7)

Detection means for monitoring the state of each part of the optical transmission module and detecting each value of one or more state information;
Wherein each one or more of status information, as well as setting a plurality of ranges of predetermined values, a non-volatile memory status information corresponding to each range that the setting is stored in association with a flag indicating whether or not it is detected A storage means,
When the one or more state information is detected by the detection means, the value of the detected state information among the plurality of predetermined ranges is included for each value of the one or more state information. And an updating means for updating the flag associated with the range to be updated only once . For each value of the status information detected by the detection means, further includes a determination means for determining whether or not an abnormal condition has occurred in comparison with a predetermined threshold for the value of the status information,
Said updating means, when an abnormal state is judged to have occurred by the determining means, the flag associated with the range including the value of the detected state information of the plurality of ranges said predetermined 1 The optical transmission module according to claim 1, wherein the optical transmission module is updated only once . One of the state information is the temperature of the optical transmission module,
The optical transmission module according to claim 1 or 2. Detecting means for monitoring the state of the optical transmission module and detecting the value of the state information;
A storage unit that is a non-volatile memory that sets a plurality of predetermined ranges and associates and stores a flag indicating whether or not state information corresponding to each set range is detected;
A state value writing threshold setting means for setting a writing threshold of a maximum value or / and a minimum value as a reference for rewriting the flag of the storage means;
When the value of the state information is detected by the detection means, the value of the detected state information exceeds the maximum value compared to the maximum value or / and the minimum write threshold value, or When the value is below the minimum value, the flag associated with the range including the detected state information value among the plurality of predetermined ranges is rewritten, and the maximum value is not exceeded or / and the minimum value is set. An update means that does not rewrite a flag associated with a range that includes the value of the detected state information among the plurality of predetermined ranges if not lower than
An optical transmission module characterized by that. When the flag is rewritten by the updating means, the maximum value and / or the minimum value write threshold is a boundary value between the predetermined range and the next range associated with the rewritten flag. Change to maximum or / and minimum value,
The optical transmission module according to claim 4. The state information is the temperature of the optical transmission module.
The optical transmission module according to claim 4, wherein the optical transmission module is an optical transmission module. Whether or not a plurality of predetermined value ranges are set for each of one or more status information detected by monitoring the status of each part of the optical transmission module, and status information corresponding to each set range is detected A state information storage method for storing state information of an optical transmission module including storage means that is a nonvolatile memory for storing a flag indicating whether or not,
A detection step of monitoring the state of each part of the optical transmission module and detecting each value of one or more state information;
An update step for updating the flag associated with the range including the detected state information value among the plurality of predetermined ranges only once for each value of the state information detected by the detecting step; The state information storage method characterized by including.

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