WO2013099344A1 - 光通信モジュール、光通信モジュールのログ記録方法および光通信装置 - Google Patents
光通信モジュール、光通信モジュールのログ記録方法および光通信装置 Download PDFInfo
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- WO2013099344A1 WO2013099344A1 PCT/JP2012/070214 JP2012070214W WO2013099344A1 WO 2013099344 A1 WO2013099344 A1 WO 2013099344A1 JP 2012070214 W JP2012070214 W JP 2012070214W WO 2013099344 A1 WO2013099344 A1 WO 2013099344A1
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- optical communication
- communication module
- power supply
- host
- host substrate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4286—Optical modules with optical power monitoring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
Definitions
- the present invention relates to an optical communication module, an optical communication module log recording method, and an optical communication apparatus. More specifically, the present invention relates to an optical communication module configured to store log information.
- An optical transceiver is a type of optical communication module.
- an optical transceiver has a function of mutually converting an electrical signal and an optical signal, a function of receiving an optical signal from an optical communication cable, and a function of transmitting an optical signal to the optical communication cable. If an optical transceiver fails, the manufacturer's technician may analyze the optical transceiver.
- Patent Document 1 Japanese Laid-Open Patent Publication No. 2004-222297 (Patent Document 1) or International Publication No. WO2005 / 107105 (Patent Document 2) discloses a method of holding information about an optical transceiver inside the optical transceiver.
- optical communication When an abnormality occurs in optical communication, it is important for an operator of the optical communication system to quickly return the optical communication to a normal state.
- a plurality of optical communication modules (in many cases, optical transceivers) are mounted on one host substrate.
- the operator When a certain host board is the cause of an optical communication abnormality, the operator usually considers replacing the host board. Therefore, even when it is estimated that there is a cause of abnormality in the plurality of optical communication modules mounted on the host substrate, the host substrate may be replaced.
- a memory for example, a non-volatile memory for storing log information related to the overall state of the host board may be mounted on the host board.
- An engineer of the manufacturer of the optical communication module can determine whether or not the optical communication module has failed by testing the optical communication module itself.
- it is necessary to analyze log information held in the memory of the host board. Therefore, when only the failed optical communication module is returned to the manufacturer's engineer, the manufacturer's engineer cannot know the situation when the optical communication module enters the failure state.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-222297 (Patent Document 1) or International Publication WO 2005/107105 (Patent Document 2). It is conceivable to configure the optical communication module by adopting a method of holding. However, for analyzing the cause of the failure of the optical communication module, information on the situation when the optical communication module enters the failure state is considered important. Neither of the above-mentioned Patent Documents 1 and 2 describes a method for leaving information relating to a situation when an optical communication module enters a failure state inside the optical communication module.
- Patent Documents 1 and 2 do not describe in detail the host substrate on which the optical communication module is mounted. For this reason, neither of Patent Documents 1 and 2 describes a technique for leaving information relating to the state of the host substrate in the optical communication module.
- Patent Document 1 describes that either a volatile storage device or a non-volatile storage device may be used as a memory for storing information relating to a failure.
- the volatile storage device when the volatile storage device is used, when the supply of the power supply voltage to the optical communication module is stopped, the information stored in the volatile storage device is lost. Therefore, for example, when the supply to the power supply voltage to the optical communication module becomes impossible due to an abnormality in the host substrate itself, or when the host substrate is removed from the optical communication device, it is stored in the optical communication module. Information may be lost. That is, the technique of Patent Document 1 does not sufficiently take into account the failure status of the optical communication module or the situation where only the failed optical communication module is returned.
- the manufacturer's engineer can change the optical communication module immediately before the failure of the optical communication module.
- the state and the state of the host substrate could not be known.
- An object of the present invention is to enable not only information relating to the optical communication module but also information relating to the host substrate to remain in the optical communication module mounted on the host substrate when an abnormality occurs in the host substrate. It is.
- An optical communication module is an optical communication module that can be inserted into and removed from a host board, and includes a control unit and a nonvolatile memory.
- the control unit monitors the optical communication module and repeatedly receives log information regarding the state of the host substrate from the host substrate.
- the control unit writes the monitoring result of the optical communication module and the log information from the host board into the nonvolatile memory.
- the optical communication module when an abnormality occurs in the host substrate, not only information related to the optical communication module but also information related to the host substrate can be left in the optical communication module mounted on the host substrate. Such information is stored in a nonvolatile memory. Therefore, even when the power supply to the optical communication module becomes abnormal due to an abnormality occurring in the host substrate, for example, information on the state of the host substrate and the state of the optical communication module immediately before the occurrence of the abnormality is stored in the optical communication module. Can be left in.
- the abnormality of the host substrate indicated by the hazard signal includes, for example, an abnormality related to power supply from the host substrate to the optical communication module, but is not limited thereto.
- the “optical communication module” may have both transmission and reception functions like an optical transceiver, or only one of the transmission function and the reception function (for example, an optical receiver or an optical transmitter). It may be.
- the optical communication module further includes a power supply monitoring unit.
- the power monitoring unit outputs a hazard signal when detecting an abnormality related to power supply from the host substrate to the optical communication module.
- the abnormality relating to the power supply includes a case where the power supply voltage supplied from the host substrate is out of a predetermined range during operation of the optical communication module.
- a hazard signal is output in response to detection of an abnormality related to power supply.
- the optical communication module writes the self-monitoring result and the log information of the host board to the nonvolatile memory. Therefore, it is possible to increase the possibility that information regarding the state of the host substrate and the state of the optical communication module is stored in the nonvolatile memory before the optical communication module is finally stopped due to an abnormality related to the power supply.
- the abnormality relating to the power supply includes, but is not limited to, a case where the power supply voltage supplied from the host board is out of a predetermined range during operation of the optical communication module.
- the optical communication module further includes a volatile memory.
- the control unit writes the monitoring result of the optical communication module and the log information from the host board into the volatile memory, and when the hazard signal is detected, the control unit reads the nonvolatile information from the volatile memory. The monitoring result of the optical communication module and the log information from the host board are transferred to the memory.
- control unit when the control unit receives log information from the host board, the control unit writes the monitoring result of the optical communication module in the volatile memory together with the received log information.
- the time lag between the log information of the host board and the monitoring result of the optical communication module can be reduced. Therefore, for example, when a failed optical communication module is returned to the manufacturer's engineer, the state of the host board indicated by the host board log information is compared with the state of the optical communication module indicated by the monitoring result of the optical communication module. By doing so, the engineer can analyze in detail the cause of the failure of the optical communication module.
- An optical communication module log recording method includes a step in which an optical communication module that can be inserted into and removed from a host substrate performs self-monitoring, and the optical communication module logs from the host substrate to the status of the host substrate.
- the optical communication module mounted on the host substrate is not only information related to the optical communication module but also information related to the host substrate. Can leave.
- the power supply abnormality includes, for example, that the power supply voltage supplied from the host substrate to the optical communication module is out of a predetermined range. For example, when the power supply voltage is outside a predetermined range during operation of the optical communication module, it is detected as an abnormality in the power supply of the host board.
- the power supply voltage outside the predetermined range includes, for example, when the power supply voltage is positive and the power supply voltage falls below the determination level.
- An optical communication apparatus includes a host substrate and a plurality of optical communication modules.
- Each of the plurality of optical communication modules can be inserted into and removed from the host substrate, and includes a nonvolatile memory.
- Each of the plurality of optical communication modules executes self-monitoring and repeatedly receives log information regarding the state of the host substrate from the host substrate.
- each of the plurality of optical communication modules writes the self-monitoring result and log information from the host substrate into the nonvolatile memory.
- the host board transmits log information to the plurality of optical communication modules at different timings.
- the optical communication module mounted on the host substrate not only includes information regarding the optical communication module but also information regarding the host substrate. Can leave. Furthermore, log information is sent to each of the plurality of optical communication modules at different timings. Therefore, log information generated at different times is held between the plurality of optical communication modules. If the number of failed optical communication modules is more than one, analyze the log information stored in these failed optical communication modules to change the state of the host board over time (conversely, the state of the host board changes) You may know what you are not doing). Therefore, the cause of the failure of the optical communication module can be analyzed in more detail. Note that “abnormality of power supply” is the same as the above definition.
- the optical communication device further includes a power switching unit in any of the optical communication devices.
- the power supply switching unit supplies power to the optical communication module instead of the host substrate until at least writing to the nonvolatile memory is completed.
- the power supply switching unit can ensure that each of the plurality of optical communication modules writes the self-monitoring result and the log information of the host board in the nonvolatile memory. Therefore, the result of self-monitoring of the optical communication module and the log information of the host board can be more reliably left inside the optical communication module.
- the power supply switching unit may supply the power supply voltage necessary for the write operation of the nonvolatile memory to the optical communication module. Therefore, the power supply voltage supplied to the optical communication module by the power supply switching unit is not limited to be the same as the power supply voltage supplied from the host board before the host board becomes abnormal.
- the present invention when an abnormality occurs in the host substrate, not only information related to the optical communication module but also information related to the host substrate can be left in the optical communication module mounted on the host substrate.
- FIG. 1 is a schematic configuration diagram of an optical communication apparatus according to an embodiment of the present invention.
- FIG. 2 is a block diagram illustrating a configuration example of the optical transceiver 1 illustrated in FIG. 1.
- FIG. 3 is a functional block diagram of a power supply switching circuit 6 shown in FIGS. 1 and 2.
- FIG. 4 is a diagram illustrating one specific configuration example of a power supply switching circuit 6 illustrated in FIG. 3.
- FIG. 3 is a block diagram illustrating a configuration of a controller 20 illustrated in FIG. 2.
- FIG. 6 is a diagram illustrating a configuration example of log information stored in a nonvolatile memory 22 illustrated in FIG. 5. It is the flowchart which showed one process at the time of normal operation of the optical transceiver which concerns on embodiment of this invention.
- FIG. 1 is a schematic configuration diagram of an optical communication apparatus according to an embodiment of the present invention.
- the optical communication device 101 includes a plurality of optical transceivers 1, a host substrate 2, a housing 5, and a fan 10.
- An optical transceiver 1 is shown in FIG. 1 as one specific form of an optical communication module according to the present invention.
- a plurality of optical transceivers 1 are mounted on the host board 2.
- Each of the plurality of optical transceivers 1 is a pluggable optical transceiver. That is, the optical transceiver 1 is configured to be insertable / removable with respect to the host board 2.
- the optical transceiver 1 converts the electrical signal sent from the host board 2 into an optical signal and outputs the optical signal to the optical network. Further, the optical transceiver 1 converts an optical signal sent through the optical network into an electric signal, and sends the electric signal to the host substrate 2.
- the front surface 1 a of the optical transceiver 1 is configured so that a connector (not shown) provided at the end of the optical communication cable can be attached to and detached from the front surface 1 a of the optical transceiver 1.
- the host board 2 is installed in the housing 5.
- the housing 5 may be a rack, for example.
- the orientation of the host substrate 2 is not particularly limited.
- FIG. 1 shows an arrangement in which the surface of the host substrate 2 is parallel to the horizontal direction.
- the host substrate 2 may be disposed, or the host substrate 2 may be placed vertically (the host substrate 2 is set up in the vertical direction).
- the number of host substrates 2 mounted on the optical communication apparatus 101 may be one or plural.
- the host board 2 is mounted with a host CPU (Central Processing Unit) 3 and a nonvolatile memory 4.
- the host CPU 3 and the nonvolatile memory 4 are representatively shown as elements mounted on the host substrate 2.
- the host CPU 3 communicates with each of the plurality of optical transceivers 1.
- the host CPU 3 further generates log information related to the monitoring of the status of the host board 2 by the host CPU 3.
- the log information is stored in the nonvolatile memory 4.
- the log information stored in the nonvolatile memory 4 includes, for example, the time when the host CPU 3 monitors the status of the host board 2 and information on the status of the host board 2 at that time.
- the nonvolatile memory 4 is a memory in which information can be written and the information can be stored in a nonvolatile manner.
- the nonvolatile memory 4 is realized by, for example, an EEPROM.
- the host CPU 3 and the nonvolatile memory 4 may be integrated.
- the power supply switching circuit 6 supplies the power supply voltage supplied from the host board 2 to each of the plurality of optical transceivers 1. A power supply voltage is supplied to the host substrate 2 from the outside of the host substrate 2. A configuration example of the power supply switching circuit 6 will be described later.
- the power supply switching circuit 6 supplies the power stored in advance to each of the plurality of optical transceivers 1. That is, the power supply switching circuit 6 has a function as a backup power supply for the plurality of optical transceivers 1.
- the power supply switching circuit 6 outputs a hazard signal indicating a power supply abnormality of the host board 2.
- an abnormality in which the power supply voltage supplied from the host board 2 to the optical transceiver 1 decreases during the operation of the optical transceiver 1 is shown.
- the “abnormality that the power supply voltage decreases” means that the power supply voltage supplied from the host substrate 2 to each of the optical transceivers 1 is lower than the determination level.
- the determination level can be appropriately determined according to the specifications of the host substrate 2 and the optical transceiver 1.
- the determination level is, for example, 3V (this value is an example presented for understanding the present embodiment, The determination level is not limited to this value).
- “abnormality in which the power supply voltage decreases” may be expressed as “the power supply of the host board 2 drops”.
- the power supply voltage supplied from the host substrate 2 to each of the plurality of optical transceivers 1 instantaneously decreases from a normal voltage (for example, 3.3V described above) to 0V. It is thought that there is much to do.
- the abnormality that “the power of the host board 2 is turned off” includes a situation where the power supply voltage is lower than the determination level, and does not limit the rate of decrease of the power supply voltage. Further, the final power supply voltage value when the power supply voltage falls below the determination level is not limited to 0V.
- a specific example of the situation in which an abnormality “the power of the host board 2 is turned off” includes a case where the power supply voltage cannot be supplied to the host board 2 due to a failure of the optical communication apparatus 101 as a whole. Further, for example, the case where the supply of the power supply voltage to the host substrate 2 is interrupted due to an abnormally high temperature of the host substrate 2 is included.
- the present invention is not limited to these examples, and other examples can be assumed.
- each optical transceiver 1 When the power of the host board 2 is turned off, each optical transceiver 1 receives a hazard signal indicating the abnormality. As a result, each optical transceiver 1 records the log information regarding its own state and the log information of the host substrate 2 in a non-volatile manner inside the optical transceiver 1. This process will be described in detail later.
- the fan 10 releases heat generated in the host substrate 2 to the outside of the optical communication device 101.
- the fan 10 is provided on the back surface of the housing 5.
- the fan 10 is not limited to be provided on the back surface of the housing 5, and may be provided on any surface (upper surface, lower surface, front surface, side surface, etc.) of the housing 5, and is provided on the host substrate 2. May be.
- FIG. 2 is a block diagram showing a configuration example of the optical transceiver 1 shown in FIG.
- the optical transceiver 1 includes an optical device 11, a transmission circuit 14, a reception circuit 17, and a controller 20.
- the optical device 11 includes a laser diode (LD) 12 and a photodiode (PD) 13.
- the laser diode 12 receives a power supply voltage and a control voltage supplied from the transmission circuit 14.
- the laser diode 12 converts the electrical signal (transmission signal) sent from the transmission circuit 14 into an optical signal, and outputs the optical signal to an optical network via an optical cable (not shown).
- the photodiode 13 receives the power supply voltage and the control voltage supplied from the receiving circuit 17.
- the photodiode 13 receives an optical signal from an optical network via an optical cable (not shown) and converts the optical signal into an electrical signal.
- the photodiode 13 outputs the electrical signal as a reception signal to the reception circuit 17.
- the transmission circuit 14 includes a driver 15 for supplying a power supply voltage and a control voltage to the laser diode 12. Further, the transmission circuit 14 includes a D / A converter (DAC) 16. The D / A converter 16 converts the digital transmission signal sent from the host CPU 3 into an analog signal. The driver 15 supplies the analog signal to the laser diode 12. Further, the transmission circuit 14 outputs a monitor voltage indicating the state of the transmission circuit 14 or the laser diode 12 to the controller 20. This monitor voltage is, for example, a voltage indicating the output light intensity of the laser diode 12.
- the receiving circuit 17 supplies a power supply voltage and a control voltage to the photodiode 13.
- the receiving circuit 17 includes an amplifier 18 and an A / D converter (ADC) 19.
- the amplifier 18 amplifies the reception signal (analog signal) sent from the photodiode 13.
- the A / D converter 19 converts the amplified analog signal into a digital signal.
- the receiving circuit 17 outputs the digital signal to the host CPU 3. Further, the receiving circuit 17 outputs a monitor voltage indicating the state of the receiving circuit 17 or the photodiode 13 to the controller 20. This monitor voltage is, for example, a voltage indicating the received light intensity of the photodiode 13.
- the controller 20 controls the optical transceiver 1 in an integrated manner.
- the controller 20 supplies a control signal and a control voltage to each of the transmission circuit 14 and the reception circuit 17.
- the controller 20 monitors the state of the optical transceiver 1 based on the monitor voltage from each of the transmission circuit 14 and the reception circuit 17.
- the controller 20 transmits information related to the state of the optical transceiver 1 to the host CPU 3 in response to a request from the host CPU 3.
- controller 20 repeatedly receives log information sent from the host CPU 3.
- the controller 20 temporarily holds the log information.
- the controller 20 may receive the log information periodically (for example, at intervals of 1 second) or may be received irregularly.
- the controller 20 receives a power supply voltage from the power supply switching circuit 6. Further, when the host board 2 is powered off, the controller 20 receives a hazard signal. In response to the hazard signal, the controller 20 stores the log information of the host substrate 2 and the log information related to the state of the optical transceiver 1 in a nonvolatile manner.
- FIG. 3 is a functional block diagram of the power supply switching circuit 6 shown in FIG. 1 and FIG. Referring to FIG. 3, power supply switching circuit 6 includes power storage device 7, comparison unit 8, and switching circuit 9.
- the power storage device 7 is realized by a device configured to perform charging and discharging, such as a secondary battery or a capacitor.
- the power storage device 7 is charged by the power supply voltage supplied from the host substrate 2.
- the power storage device 7 releases the stored power.
- the capacity of the power storage device 7 is at least a plurality of times until each of the plurality of optical transceivers 1 finishes the operation of writing the self-monitoring result and the log information from the host board in the nonvolatile memory inside the optical transceiver 1. It is determined so that power can be supplied to the optical transceiver 1.
- the comparison unit 8 is a circuit for detecting a decrease in the power supply voltage of the host substrate 2. When the power supply voltage of the host substrate 2 falls below the determination level, the comparison unit 8 outputs a hazard signal. The hazard signal is sent to the switching circuit 9 and the controller 20 of the optical transceiver 1. That is, the comparison unit 8 functions as a power supply monitoring unit that monitors the power supply voltage of the host substrate 2.
- the switching circuit 9 supplies the voltage of the power storage device 7 to the optical transceiver 1 when receiving the hazard signal.
- the switching circuit 9 supplies the power supply voltage of the host substrate 2 to the optical transceiver 1 when no hazard signal is received.
- FIG. 4 is a diagram showing a specific configuration example of the power supply switching circuit 6 shown in FIG. Referring to FIG. 4, resistance elements R1 and R2 divide the voltage of power storage device 7 to generate a reference voltage corresponding to the determination level.
- the comparison unit 8 compares the reference voltage generated as described above with the power supply voltage from the host board. In a normal case, that is, when the power supply of the host substrate is not turned off, the voltage of the power storage device 7 is equal to the power supply voltage of the host substrate 2. For this reason, the power supply voltage of the host substrate 2 becomes higher than the reference voltage. In this case, the comparison unit 8 does not output a hazard signal. On the other hand, when the power supply voltage from the host substrate is lower than the reference voltage, the comparison unit 8 outputs a hazard signal. The hazard signal is input to the input port of the controller 20.
- the power supply voltage for operating the comparison unit 8 is supplied from a host substrate, for example.
- hazard signal is output is a state where the level of the hazard signal is L (low) level
- hazard signal is not output is a state where the level of the hazard signal is H (high) level. It is.
- the hazard signal is at the H level. That is, no hazard signal is output from the comparison unit 8.
- the power supply voltage of the host substrate falls below the normal level, the hazard signal becomes L level. That is, a hazard signal is output from the comparison unit 8.
- the power supply of the host substrate 2 When the power supply of the host substrate 2 is turned off, it is considered that the power supply voltage cannot be supplied from the host substrate 2 to the comparison unit 8. Also in this case, the hazard signal becomes L level. That is, a hazard signal is output from the comparison unit 8. With the above-described configuration, it is possible to output a hazard signal from the comparison unit 8 when the host substrate 2 is powered off.
- the switching circuit 9 is composed of diodes D1 to D3.
- Diode D1 is arranged such that a current flows from power storage device 7 to the power supply input terminal of controller 20.
- the diode D ⁇ b> 2 is arranged so that current flows from the host substrate 2 to the power storage device 7.
- the diode D3 is arranged so that a current flows from the host substrate 2 to the power input terminal of the controller 20.
- a current flows from the host substrate 2 to the power input terminal of the controller 20 by the diode D3. Furthermore, current flows from the host substrate 2 to the power input terminal of the controller 20 by the diode D2, and the power storage device 7 is charged.
- the power supply voltage of the host substrate 2 decreases, the supply of the power supply voltage from the host substrate 2 to the controller 20 is cut off by the diode D3. Further, the power supply voltage is supplied from the power storage device 7 to the controller 20 by the diode D1.
- the power supply voltage supplied from the power storage device 7 is substantially equal to the power supply voltage supplied from the host substrate 2 to the optical transceiver 1 before the host substrate 2 is powered off.
- the power supply voltage supplied from the power storage device 7 and the power supply voltage supplied from the host substrate 2 to the optical transceiver 1 need not be limited.
- the power supply voltage supplied from the power storage device 7 only needs to be within a predetermined range as the power supply voltage of the optical transceiver 1.
- the power storage device 7 also supplies power to the optical transceiver 1 when the power supply of the host board 2 is abnormal (particularly when the power voltage of the host board 2 falls below a determination level when the optical transceiver 1 is operating). Anything is possible. Therefore, the power storage device 7 is not limited to a battery that can be charged and discharged, such as a secondary battery, and a primary battery may be used. The voltage of the primary battery only needs to be within a predetermined range as the power supply voltage of the optical transceiver 1, and need not be limited to the same power supply voltage supplied from the host substrate 2 to the optical transceiver 1. .
- the power supply switching circuit 6 is mounted on the host substrate 2 separately from the optical transceiver 1. However, some or all of the components of the power supply switching circuit 6 may be incorporated in the optical transceiver 1. According to one embodiment, the comparison unit 8 that is a power supply monitoring unit is built in the optical transceiver 1. According to this configuration, since the optical transceiver 1 has a power supply voltage monitoring function, the functionality of the optical transceiver 1 can be enhanced.
- the power supply switching circuit 6 is not limited to be provided inside the optical transceiver 1 or on the host substrate 2, and may be provided in any one of the optical communication apparatuses 101.
- FIG. 5 is a block diagram showing a configuration of the controller 20 shown in FIG.
- the configuration shown in FIG. 5 can be realized by any of a plurality of semiconductor integrated circuits or a single semiconductor integrated circuit.
- the controller 20 includes a control unit 21, a nonvolatile memory 22, a volatile memory 23, a bus 24, an A / D converter 25, a D / A converter 26, and a data bus interface 27.
- the control unit 21 controls the overall operation of the controller 20.
- the nonvolatile memory 22 is not only capable of writing information and reading information, but also capable of storing written information in a nonvolatile manner. “Non-volatile storage” means that information can be retained even when the power supply voltage is not supplied to the nonvolatile memory 22.
- the nonvolatile memory 22 is realized by, for example, an EEPROM.
- the volatile memory 23 can write and read information. When the supply of the power supply voltage to the volatile memory 23 is stopped, the information stored in the volatile memory 23 is lost.
- the volatile memory 23 is realized by, for example, DRAM (Dynamic Random Access Memory) or SRAM (Static Random Access Memory).
- the bus 24 is for transmitting information between the control unit 21 and the non-volatile memory 22, or between the control unit 21 and the volatile memory 23, for example.
- the A / D converter 25 converts, for example, the monitor voltage sent from the transmission circuit 14 or the reception circuit 17 shown in FIG. 2 into a digital signal.
- the A / D converter 25 outputs the digital signal to the control unit 21.
- the D / A converter 26 converts, for example, a digital control signal sent from the control unit 21 into an analog control signal.
- the D / A converter 26 outputs the analog control signal to the transmission circuit 14 or the reception circuit 17 shown in FIG.
- the data bus interface 27 is a circuit for exchanging data between the transmission circuit 14 or the reception circuit 17 shown in FIG.
- the logic port 28 is a circuit for the control unit 21 to transmit a digital control signal to the transmission circuit 14 or the reception circuit 17, for example.
- the data bus interface 27 is a circuit for exchanging data between, for example, the transmission circuit 14 or the reception circuit 17 shown in FIG.
- the data bus interface 29 is a circuit for the control unit 21 to exchange data with, for example, the host CPU 3 or another element (for example, another optical transceiver) mounted on the host substrate 2.
- the control unit 21 receives log information from the host board via the data bus interface 29. Alternatively, the control unit 21 outputs log information stored in the volatile memory 23 to the data bus interface 29 in response to a request from the host substrate 2 (host CPU 3).
- the temperature sensor 30 detects the temperature of the optical transceiver 1 and outputs a signal indicating the temperature to the control unit 21. Since the temperature sensor 30 only needs to be disposed inside the optical transceiver 1, the temperature sensor 30 may be provided separately from the controller 20.
- the control unit 21 repeatedly monitors the state of the optical transceiver 1. That is, the control unit 21 implements the self-monitoring function of the optical transceiver 1. Further, when log information is sent from the host board 2 to the optical transceiver 1, the control unit 21 adds information related to monitoring of the state of the optical transceiver 1 to the log information from the host board 2, and Log information is written to the volatile memory 23.
- the hazard signal is input to the control unit 21 via the logic port 28, for example.
- the control unit 21 stops normal routine processing and transfers the log information stored in the volatile memory 23 to the nonvolatile memory 22. That is, the control unit 21 reads log information from the volatile memory 23 and writes the log information to the nonvolatile memory 22.
- the power supply voltage for the operation of the control unit 21, the volatile memory 23, and the nonvolatile memory 22 at this time is determined by the power storage device 7 included in the power supply switching circuit 6 (see FIGS. 3 and 4). Supplied.
- the nonvolatile memory 22 stores the log information related to the state of the optical transceiver 1 and the state of the host substrate 2 immediately before the host substrate 2 is turned off in a nonvolatile manner.
- the log information 42 illustrated in FIG. 5 indicates log information stored in the nonvolatile memory 22.
- FIG. 6 is a diagram illustrating a configuration example of log information stored in the nonvolatile memory 22 illustrated in FIG. 5 and 6, log information 42 includes optical transceiver status 42a (hereinafter simply referred to as “status 42a”), alarm information 42b, temperature monitor information 42c, time information 42d, and host board. Log 42e.
- Address A1 is assigned to status 42a.
- An address A2 is assigned to the alarm information 42b.
- An address A3 is assigned to the temperature monitor information 42c.
- An address A4 is assigned to the time information 42d.
- the address A5 is assigned to the host board log 42e. The addresses A1 to A5 are determined according to the size of each item of the log information 42.
- the status 42a is a code indicating the state of the optical transceiver 1 when the control unit 21 monitors the optical transceiver.
- the alarm information 42b is information indicating that an abnormality has occurred in the optical transceiver 1. For example, when the temperature of the optical transceiver 1 exceeds a reference value, a flag (for example, “1”) indicating that is generated as the alarm information 42b.
- the temperature monitor information 42c is information indicating the temperature when the temperature of the optical transceiver 1 exceeds the reference value.
- the control unit 21 generates a temperature measurement value based on the output of the temperature sensor 30, and includes the temperature measurement value in the log information as temperature monitor information 42c.
- the time information 42d is time information provided from the host board. This time may be, for example, the time when the host board 2 (host CPU 3) generates log information, or the time when the host CPU 3 monitors the host board 2.
- the host board log 42e is log information sent from the host board 2.
- the host board log 42e includes information regarding the temperature of the host board 2, for example.
- other information may be included in the host substrate log 42e.
- Such “other information” includes, for example, information indicating whether the fan 10 (see FIG. 1) is normal.
- the information included in the host substrate log 42e is not limited to these, and may include other information related to the host substrate 2.
- the control unit 21 temporarily stores the time information 42d and the host board log 42e sent from the host board 2 in the volatile memory 23, and writes the time information 42d and the host board log 42e to the nonvolatile memory 22.
- the status 42a, the alarm information 42b, and the temperature monitor information 42c may be generated and written to the nonvolatile memory 22.
- a plurality of log information 42 may be stored in the volatile memory 23.
- Each log information 42 has the configuration shown in FIG.
- the control unit 21 collectively transfers a plurality of log information 42 to the nonvolatile memory 22 in response to reception of the hazard signal.
- FIG. 7 is a flowchart showing one process during normal operation of the optical transceiver according to the embodiment of the present invention.
- the main routine process is started.
- the control unit 21 monitors the temperature of the optical transceiver 1 by receiving the measurement value of the temperature sensor 30. Further, in step S1, the control unit 21 updates the status (corresponding to the status 42a). For example, the control unit 21 holds the status inside the control unit 21 and updates the status.
- Step S1 corresponds to a step in which the optical transceiver 1 performs self-monitoring.
- step S2 the control unit 21 determines whether there is communication from the host board 2. For example, when a transmission request or a reception request is sent from the host substrate 2 to the control unit 21, the control unit 21 determines that there is communication from the host substrate. If there is communication from host substrate 2 (YES in step S2), the process proceeds to step S3. If there is no communication from host substrate 2 (NO in step S2), the process returns to step S1. That is, when there is no communication from the host substrate 2, the processes of steps S1 and S2 are repeated.
- step S3 the control unit 21 determines whether there is log information from the host board 2.
- the control unit 21 determines that there is log information from the host substrate 2. In this case (YES in step S3), the process proceeds to step S4.
- the process returns to step S1. .
- step S4 the control unit 21 acquires log information from the host substrate 2.
- step S ⁇ b> 5 the control unit 21 updates log information (host board log) on the volatile memory 23. Specifically, the control unit 21 adds information relating to the monitoring of the state of the optical transceiver 1 to the log information from the host substrate 2 and writes the log information to the volatile memory 23.
- the configuration of the log information is the configuration shown in FIG.
- FIG. 8 is a flowchart showing the processing of the optical transceiver when the host board is powered off.
- the control unit 21 determines whether or not the host substrate 2 has been powered off. Specifically, the control unit 21 detects a power-off of the host board 2 (that is, the power of the host board 2 has been dropped) by detecting a hazard signal. Detection of power-off of the host board 2 may be executed by interrupt processing. Alternatively, the power-off of the host substrate 2 may be detected by detecting a change in state due to polling. By the processing in step S11, an abnormality in power supply from the host substrate 2 to the optical transceiver 1 is detected.
- step S12 the control unit 21 determines whether a shutdown instruction has been received from the host substrate 2. For example, in order to save power of the optical communication apparatus 101, the supply of the power supply voltage of the optical transceiver 1 may be stopped intermittently. In such a case, for example, the optical transceiver 1 stops its operation in response to a shutdown instruction from the host board 2.
- step S12 If there is a shutdown instruction from the host board 2 (YES in step S12), the processing shown in FIG. On the other hand, when there is no shutdown instruction from host substrate 2 (NO in step S12), the process proceeds to step S13.
- step S13 the control unit 21 determines that a log information recording condition has occurred.
- step S ⁇ b> 14 the control unit 21 transfers the log information stored in the volatile memory 23 to the nonvolatile memory 22 and writes the log information to the nonvolatile memory 22.
- log information 42 (see FIG. 6) is stored in the nonvolatile memory 22.
- the host board 2 may transfer the same log information to each of the plurality of optical transceivers 1 shown in FIG. It is usually not possible to predict which of the plurality of optical transceivers 1 will fail. By storing the same log information in a plurality of optical transceivers 1, it is possible to increase the probability that log information of the host substrate 2 can be left in the failed optical transceiver 1.
- the host board 2 may transfer the log information to the plurality of optical transceivers 1 at different times.
- the host board 2 may cyclically transfer log information between the plurality of optical transceivers 1. That is, when the number of optical transceivers 1 is N (N is an integer equal to or greater than 2), the host substrate 2 is the first optical transceiver, the second optical transceiver,..., The Nth optical transceiver, the first Log information is transferred in the order of the optical transceiver, the second optical transceiver,. In this case, log information generated at different times is held among the N optical transceivers 1.
- the time change of the state of the host substrate 2 (reversely, the state of the host substrate 2). May be that it has not changed). Therefore, the cause of the optical transceiver failure can be analyzed in more detail.
- log information of the host board is repeatedly sent to the optical transceiver 1 that can be inserted into and removed from the host board 2. Furthermore, the optical transceiver 1 performs self-monitoring.
- the optical transceiver 1 (the control unit 21 of the controller 20) stores the log information of the host board and the self-monitoring result of the optical transceiver 1 in the volatile memory.
- Log information stored in the volatile memory by detecting a hazard signal indicating an abnormality in the power supply of the host board 2 (the power supply voltage supplied to the optical transceiver 1 has dropped below the normal level when the optical transceiver 1 is operating) And the result of self-monitoring of the optical transceiver are written in the nonvolatile memory 22.
- an abnormality occurs in optical communication, it can be easily determined whether the cause is in the optical transceiver or in the host device (host board). For example, an optical communication operator replaces a failed optical transceiver with a new (normal) optical transceiver. Thus, if the optical communication is restored, it can be easily determined that the cause of the abnormality is the optical transceiver.
- the control unit 21 transfers log information stored in the volatile memory 23 to the nonvolatile memory 22. Therefore, when an optical transceiver fails due to an abnormality such as a power-off of the host board 2, not only information on the state of the optical transceiver 1 immediately before the failure but also the state of the host board immediately before the abnormality from the failed optical transceiver 1. Log information can be retrieved. As a result, the cause of the failure of the optical transceiver 1 can be analyzed in detail.
- the temperature monitor information included in the log information a temperature value higher than usual is indicated.
- the log information includes information indicating the abnormality of the fan 10 in addition to the information on the temperature of the host board, the heat radiation of the host board 2 has deteriorated. It can be estimated that this is the cause of the failure.
- a power supply switching circuit 6 is provided in case the power supply voltage of the host board 2 drops.
- the power supply switching circuit 6 can supply a power supply voltage to the optical transceiver 1 until the writing of log information to the nonvolatile memory 22 in the optical transceiver 1 is completed. Therefore, log information regarding the state of the optical transceiver and the state of the host board can be stored in the optical transceiver 1 in a nonvolatile manner.
- nonvolatile memories such as EEPROM generally have a limit on the number of times of writing. If log information is frequently written to the nonvolatile memory 22, the life of the nonvolatile memory 22 may be shortened. According to this embodiment, log information is temporarily stored in the volatile memory 23. The writing of log information to the nonvolatile memory 22 is executed only when the host board is powered off. As a result, the number of times the nonvolatile memory 22 is written can be reduced. Therefore, it is possible to prevent the lifetime of the optical transceiver 1 from being shortened due to the lifetime of the nonvolatile memory 22.
- the temperature of the optical transceiver is monitored in the optical transceiver.
- the optical transceiver 1 may monitor other monitor values in addition to the temperature monitor value or instead of the temperature monitor value.
- the control unit 21 stores the monitored monitor value in the volatile memory 23 and transfers it to the nonvolatile memory 22 when the host board 2 is powered off.
- FIG. 9 is a diagram showing examples of monitor value candidates of the optical transceiver and types of abnormalities that can be understood from the monitor values.
- the temperature of the optical transceiver 1, the output light intensity of the laser diode 12, the received light intensity of the photodiode 13, and the power supply voltage supplied to the optical transceiver 1 are considered as monitor values. Since the method of monitoring the temperature of optical transceiver 1 is as described above, detailed description will not be repeated hereinafter.
- the monitoring of the output light intensity of the laser diode 12 and the received light intensity of the photodiode 13 is executed as follows, for example.
- the transmission circuit 14 outputs a monitor voltage indicating the output light intensity of the laser diode 12 to the controller 20.
- the receiving circuit 17 outputs a monitor voltage indicating the received light intensity of the photodiode 13 to the controller 20.
- the controller 20 AD converts the monitor voltage output from the transmission circuit 14 and the monitor voltage output from the reception circuit 17 by the A / D converter 25.
- the digital signal output from the A / D converter 25 is a monitor value indicating the output light intensity or a monitor value indicating the received light intensity.
- the control unit 21 receives these monitor values. Thereby, the control unit 21 monitors the output light intensity of the laser diode 12 and the received light intensity of the photodiode 13.
- the temperature of the laser diode 12 is controlled by, for example, a Peltier element so that the output light intensity is constant.
- the difference between the temperature of the laser diode 12 and the surrounding temperature becomes too large, it becomes difficult to keep the temperature of the laser diode 12 constant. For this reason, it becomes difficult to keep the output light intensity of the laser diode 12 constant. Therefore, as described above, the temperature may be monitored.
- the output light intensity is too high, for example, from the viewpoint of safety (for example, safety for human eyes).
- the laser diode 12 may have reached the end of its life. Therefore, the output light intensity may be monitored.
- a highly sensitive photodiode is used for optical communication. If the intensity of the optical signal input to the photodiode for optical communication is too high, the photodiode may be damaged. Therefore, the received light intensity may be monitored.
- optical transceiver is not limited to the example shown in FIG. 9, and may monitor other items related to the optical transceiver.
- an abnormality in the power supply of the host substrate 2 is shown as an abnormality in the host substrate 2.
- the type of abnormality of the host substrate to be detected is not particularly limited. It suffices if the hazard signal indicating the abnormality is transmitted to the control unit 21.
- the power supply voltage that is the target of abnormality detection is not limited to the power supply voltage during operation of the optical transceiver.
- the power supply abnormality of the host board 2 You may detect as. That is, the abnormality detected as an abnormality in the power supply of the host board 2 may be an abnormality in which the power supply voltage supplied to the optical transceiver 1 is out of a predetermined range.
- the power supply voltage of the optical transceiver 1 is a positive voltage is shown.
- the power supply voltage of the optical transceiver 1 may be a negative voltage.
- all of the plurality of optical transceivers shown in FIG. 1 have a function of storing log information in a nonvolatile manner.
- some of the plurality of optical transceivers may have the log information storage function described in this embodiment, and the remaining optical transceivers may not have the log information storage function.
- an optical transceiver is shown as one specific form of the optical communication module according to the present invention.
- the optical communication module according to the present invention is not limited to the one having both the transmission function and the reception function like the optical transceiver.
- the optical communication module according to the present invention may have only one of a transmission function and a reception function. Therefore, the optical communication module according to the present invention may be an optical receiver or an optical transmitter.
- 1 optical transceiver 1a front (optical transceiver), 2 host board, 3 host CPU, 4,22 non-volatile memory, 5 housing, 6 power supply switching circuit, 7 power storage device, 8 comparison unit, 9 switching circuit, 11 optical device , 12 laser diode, 13 photodiode, 14 transmission circuit, 15 driver, 16, 26 D / A converter, 17 reception circuit, 18 amplifier, 19, 25 A / D converter, 20 controller, 21 control unit, 23 volatile memory 24 bus, 27, 29 data bus interface, 28 logic port, 30 temperature sensor, 42 log information, 101 optical communication device.
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Abstract
Description
Claims (7)
- ホスト基板(2)に挿抜可能な光通信モジュールであって、
前記光通信モジュールを監視し、前記ホスト基板(2)から前記ホスト基板(2)の状態に関するログ情報を繰り返し受ける制御部(21)と、
不揮発性メモリ(22)とを備え、
前記ホスト基板(2)の異常を示すハザード信号を検出した場合、前記制御部(21)は、前記光通信モジュールの監視結果と前記ホスト基板(2)からの前記ログ情報とを前記不揮発性メモリ(22)に書き込む、光通信モジュール。 - 電源監視部(8)をさらに備え、
前記電源監視部(8)は、前記ホスト基板(2)から前記光通信モジュールへの電源供給に関する異常を検知したときに前記ハザード信号を出力し、
前記電源供給に関する前記異常は、前記光通信モジュールの稼動時において前記ホスト基板(2)から供給される電源電圧が所定の範囲を外れる場合を含む、請求項1に記載の光通信モジュール。 - 前記光通信モジュールは、
揮発性メモリ(23)をさらに備え、
前記制御部(21)は、前記ハザード信号が検出されない場合には、前記光通信モジュールの前記監視結果と前記ホスト基板(2)からの前記ログ情報とを前記揮発性メモリ(23)に書き込んでおいて、前記ハザード信号が検出されると、前記揮発性メモリ(23)から前記不揮発性メモリ(22)に、前記光通信モジュールの前記監視結果と前記ホスト基板(2)からの前記ログ情報とを転送する、請求項1または2に記載の光通信モジュール。 - 前記制御部(21)は、前記ホスト基板(2)から前記ログ情報を受け取った場合に、当該受け取ったログ情報とともに、前記光通信モジュールの前記監視結果を前記揮発性メモリ(23)に書き込む、請求項3に記載の光通信モジュール。
- ホスト基板(2)に挿抜可能な光通信モジュールが自己監視を実行するステップと、
前記光通信モジュールが、前記ホスト基板(2)から、前記ホスト基板(2)の状態に関するログ情報を受け取るステップと、
前記ホスト基板(2)から前記光通信モジュールへの電源供給の異常を検知した場合に、前記光通信モジュールに実装された不揮発性メモリ(22)に、前記光通信モジュールの前記自己監視の結果と前記光通信モジュールが受け取った前記ログ情報とを書き込むステップとを備える、光通信モジュールのログ記録方法。 - ホスト基板(2)と、
各々が前記ホスト基板(2)に挿抜可能であり、不揮発性メモリ(22)を含む複数の光通信モジュール(1)とを備え、
前記複数の光通信モジュール(1)の各々は、自己監視を実行し、前記ホスト基板(2)から前記ホスト基板(2)の状態に関するログ情報を繰り返し受け、
前記ホスト基板(2)から前記光通信モジュール(1)への電源供給に関する異常が生じた場合に、前記複数の光通信モジュール(1)の各々は、前記自己監視の結果と前記ホスト基板(2)からの前記ログ情報とを前記不揮発性メモリ(22)に書き込み、
前記ホスト基板(2)は、前記複数の光通信モジュール(1)に対して互いに異なるタイミングでログ情報を送信する、光通信装置。 - 前記光通信装置は、前記光通信装置内のいずれかに電源切換部(9)をさらに含み、
前記電源切換部(9)は、前記ホスト基板(2)の前記電源供給に関する異常を検知した場合には、少なくとも前記不揮発性メモリ(22)への書込みが終わるまで、前記ホスト基板(2)に代わり前記光通信モジュール(1)への電源供給を実行する、請求項6に記載の光通信装置。
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US14/365,708 US9356690B2 (en) | 2011-12-26 | 2012-08-08 | Optical communication module, method for recording log of optical communication module, and optical communication apparatus |
CA2861210A CA2861210A1 (en) | 2011-12-26 | 2012-08-08 | Optical communication module, method for recording log of optical communication module, and optical communication apparatus |
US15/133,560 US20160233952A1 (en) | 2011-12-26 | 2016-04-20 | Optical communication module, method for recording log of optical communication module, and optical communication apparatus |
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US20160116368A1 (en) * | 2014-10-23 | 2016-04-28 | Samtec, Inc. | Method for approximating remaining lifetime of active devices |
TWI525462B (zh) * | 2014-12-25 | 2016-03-11 | Yu-Wei Huang | Message graphic display method |
TWI600285B (zh) * | 2015-07-22 | 2017-09-21 | 鴻海精密工業股份有限公司 | 光網路單元及其異常超時發光檢測方法 |
US9918401B2 (en) | 2015-12-17 | 2018-03-13 | Hewlett Packard Enterprise Development Lp | Bay for removable device |
JP6684441B2 (ja) * | 2016-04-19 | 2020-04-22 | 日本電気株式会社 | 光通信システム、光通信装置、光通信診断監視方法および光通信診断監視プログラム |
US10326523B1 (en) | 2017-12-15 | 2019-06-18 | International Business Machines Corporation | Optical module and link operationanalysis and failure prediction |
JP6849236B2 (ja) * | 2019-03-27 | 2021-03-24 | Necプラットフォームズ株式会社 | 伝送装置、通信方法、プログラム、および通信システム |
US20230412265A1 (en) * | 2022-06-14 | 2023-12-21 | Mellanox Technologies, Ltd. | Transceiver module |
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