JP4699809B2 - Time delivery system - Google Patents

Description

  The present invention relates to a time authentication service technology, and more particularly to a time delivery system used in a TA (Time Authority) that delivers time information from an NTA (National Time Authority) to a TSA (Time Stamp Authority).

  Time authentication for certifying non-falsification of an electronic document is performed by an organization called TSA. As a time stamp used by TSA for time authentication, UTC (Coordinated Universal Time) which is a standard time managed by NTA is used. In TSA, when the content of an electronic document subjected to time authentication becomes a problem several years later, a time stamp is used to prove that the electronic document has not been tampered with. At this time, it is necessary to indicate that the time was received from a reliable time source called time traceability, and that the error between the use time and the use time source was in a sufficiently satisfactory range. Therefore, as time traceability information, information such as the identification of the NTA being used, the time delivery route to the NTA being used, and the time error information with the NTA being used is required.

  When verifying that the electronic document has not been tampered with, the TSA requests the TA to provide the above information. Therefore, TA can guarantee the time delivery route from NTA to TSA, and can guarantee that the time difference between NTA and TSA is within the accuracy required by TSA. Need to be implemented. It is necessary to store information related to time delivery for a long period of time and to disclose information satisfying the request when the above-described provision of information is requested. Also, time delivery to the TSA must not be interrupted.

  As a method for supplying time, it is conceivable to use an atomic clock incorporating a highly accurate transmitter such as a rubidium transmitter. In this case, a synchronization method with NTA and an error information acquisition method are required. Further, in order to perform time delivery to the TSA, a time delivery method to the TSA and an error information acquisition method are required.

  Conventionally, as an error information acquisition method with NTA, a highly accurate error information acquisition method using GPS (Global Positioning System) has been proposed, and a time synchronization method using a method such as NTP or JJY has been proposed. (For example, refer nonpatent literature 1 etc.). For the time delivery between the NTA and the TA, high-accuracy error measurement may be used separately. For time delivery from TA to TSA, NTP (Network Time Protocol) can be used. NTP realizes time delivery through multiple paths, and is highly available for time delivery to TSA.

  On the other hand, a technique for monitoring a time difference of a timepiece device that obtains time information by measuring a predetermined reference signal has also been proposed (see, for example, Patent Document 1). This is because a plurality of time differences between the first time measured by the reference signal and the second time measured by the monitoring signal different from the reference signal are measured for each predetermined measurement period, and the time is measured for each measurement period. By calculating the slope measurement value indicating the change trend of the difference, statistically processing each slope measurement value, determining the monitoring range for the new slope measurement value, and comparing the monitoring range with the new slope measurement value The time difference is monitored.

JP 2003-344571 A www2.nict.go.jp/kk/e412/CRL_News/9902/news275.html

However, such conventional techniques have the following problems.
First, according to the former, the NTP reciprocates packets from the client to the server, calculates the time difference between the server and the client under the assumption that the one-way delay time is equal, and performs time synchronization. For this reason, when there is a difference in one-way delay time or when the delay variation is large, a time synchronization error occurs.

  In particular, it is difficult to predict delay variation on the Internet, and the identity of the round trip path is not guaranteed. For this reason, when the TSA performs time synchronization through the Internet using NTP, it is difficult to grasp the accuracy of time synchronization, and the error between the use time and the use time source required for time traceability can be satisfied. Cannot be guaranteed. In addition, since NTP is normally executed on a personal computer or workstation, it is not possible to guarantee the tampering of these devices. Further, when the TA constructs a time delivery system, it is necessary to guarantee a delivery route from the NTA to the TSA so that time delivery from a time source other than the designated time is not performed.

Further, according to the latter, the target network is a dedicated network such as a digital line of a digital synchronous network using an optical path, and there is a problem in that users that can be used are limited.
The present invention is for solving such a problem, and it is possible to guarantee time accuracy and a delivery route when delivering time information from a time source device to a user terminal without requiring a special network. It aims to provide a delivery system.

In order to achieve such an object, a time distribution system according to the present invention distributes time information generated by a time source device that measures a desired reference time to a user terminal via a network. A time distribution unit that sequentially distributes time information from the time source device side to the user terminal side along a transfer path provided on the network, and a clock unit that measures a monitoring time by a predetermined frequency signal; A time monitoring unit that monitors the internal time of its own device used for time information delivery in the time delivery unit based on the monitoring time, a route monitoring unit that monitors the transmission source of the time information received by the time delivery unit, and A time distribution device with a clock function having a log storage unit that stores the contents of processing operations in each unit as log information, and a log storage unit of the time distribution device with a clock function via a network A log receiving unit for receiving grayed information, and a log storage unit and the log collecting apparatus having to save the collected log information in the log receiving unit, the clock function time delivery apparatus, the predetermined frequency of the frequency signal A frequency monitoring unit for monitoring the frequency by comparing with the allowable range is further provided. When the frequency exceeds the allowable range, the time distribution unit stops the distribution of the time information .

Another time delivery system according to the present invention is a time delivery system that delivers time information generated by a time source device that measures a reference time to a user terminal via a network, and is provided on the network. The time information is sequentially delivered from the time source device side to the user terminal side along the transferred path, and the internal time of the own device used for delivery of the time information is delivered to the monitoring clock device via the network as the monitoring target time. A time distribution unit having a clock function, a route monitoring unit that monitors a transmission source of time information received by the time distribution unit, and a log storage unit that stores the contents of processing operations in these units as log information A time distribution unit for receiving a monitoring target time delivered from a time delivery device without a clock function via a network, and a monitoring time by a predetermined frequency signal A clock unit for timing, a time monitoring unit for monitoring the monitoring target time based on the monitoring time, a route monitoring unit for monitoring the transmission source of the monitoring target time received by the time distribution unit, and the contents of processing operations in these units A monitoring clock device having a log storage unit that stores log information as log information, a log receiving unit that receives log information from each log storage unit of the time distribution device without a clock function and the monitoring clock device via a network, And a log collection device having a log storage unit for storing log information collected by the log reception unit, and transmitting an operation signal to the monitoring clock device to transmit various instructions to the time distribution device having no clock function via the network. And a frequency monitoring unit for monitoring the frequency by comparing the frequency of the frequency signal with a predetermined allowable range. When the frequency exceeds the allowable range, an operation signal is transmitted. The time signal delivery stop instruction is transmitted to the time delivery device without the clock function by the control unit, and the operation signal reception unit for receiving various instructions via the network is further provided by the time delivery device without the clock function, and is monitored by the operation signal reception unit. When the delivery stop instruction is received from the timepiece device, the time delivery unit stops the delivery of the time information.

  At this time, the time information is sequentially delivered from the time source device side to the user terminal side along the transfer path provided on the network, and the internal time of the own device used for delivery of the time information is set as the monitoring target time via the network. A time delivery unit for delivering to the monitoring clock device, a route monitoring unit for monitoring the transmission source of the time information received by the time delivery unit, and a log storage unit for saving the contents of processing operations in these units as log information; A time distribution device without a clock function, a time distribution unit that receives a monitoring target time delivered from a time distribution device without a clock function via a network, a clock unit that measures a monitoring time by a predetermined frequency signal, A time monitoring unit that monitors the monitoring target time based on the monitoring time, a route monitoring unit that monitors the transmission source of the monitoring target time received by the time distribution unit, and a process in each of these units A monitoring clock device having a log storage unit for storing operation contents as log information, and a log receiving unit of the log collection device via a network with a time distribution device with a clock function and a time distribution device without a clock function And log information from each log storage unit of the monitoring clock device may be received.

  As a specific example of time monitoring, in a time distribution device with a clock function, the time monitoring unit compares the time error between the internal time and the monitoring time with a predetermined allowable error, and if the time error exceeds the allowable error Delivery of time information may be stopped by the time delivery unit.

  As another specific example of the time monitoring, the monitoring clock device further includes an operation signal transmission unit that transmits various instructions to the time distribution device without a clock function via the network, and the time monitoring unit allows the time without the clock function to be transmitted. The time difference between the monitoring target time and the monitoring time from the delivery device is compared with a predetermined allowable error. If the time error exceeds the allowable error, the operation signal transmission unit issues a time information delivery stop instruction to the time without the clock function. An operation signal receiving unit that transmits to the delivery device and receives various instructions via the network is further provided in the time delivery device without a clock function, and the time when a delivery stop instruction is received from the monitoring clock device by the operation signal receiving unit. You may make it stop delivery of time information by a delivery part.

  As a specific example of route monitoring, in a time distribution device with a clock function, the route monitoring unit compares the transmission source of the time information with the transmission source according to the transfer route, and if these transmission sources are different, the time distribution unit You may make it stop delivery of.

  As another specific example of route monitoring, in a time distribution device without a clock function, the route monitoring unit compares the transmission source of the monitoring target time with the transmission source according to the transfer route, and if these transmission sources are different, the time You may make it stop delivery of time information by a delivery part.

  As another specific example of route monitoring, the monitoring clock device is further provided with an operation signal transmission unit that transmits various instructions to the time distribution device without a clock function via the network, and the route monitoring unit transmits the monitoring target time. Compare the source and the transmission source to be monitored, and if these transmission sources are different, the operation signal transmission unit transmits a time information delivery stop instruction to the time delivery device without a clock function, An operation signal receiving unit that receives various instructions via the network is further provided, and when the operation signal receiving unit receives a delivery stop instruction from the monitoring clock device, the time delivery unit stops the delivery of time information. Good.

  As a specific example of log storage, in a time delivery device with a clock function, the log storage unit logs the delivery result information on the time information delivery operation in the time delivery unit and the monitoring results in the time monitoring unit and the route monitoring unit. You may make it preserve | save as.

  As another specific example of log storage, in a time delivery device without a clock function, the log storage unit logs the delivery result information related to the time information delivery operation in the time delivery unit and the monitoring result in the route monitoring unit. You may make it preserve | save as.

  As another specific example of log storage, in the monitoring clock device, the log storage unit uses the time distribution reception result information in the time distribution unit and the monitoring results in the time monitoring unit and the route monitoring unit as log information. You may make it preserve | save.

  In the log collection device, when the log information collected by the log receiving unit is saved by the log saving unit, time authentication for authenticating the time at the time of saving may be performed.

According to the present invention, a time distribution system using a time distribution device with a clock function does not require a special dedicated line or network, such as a digital line of a digital synchronous network using an optical path. In addition to guaranteeing the time information delivered with the desired time accuracy based on the monitoring time of the clock unit, the delivery route of the time information delivered by the time delivery device can be guaranteed. Also, log information related to time delivery is stored in the log collection device and can be easily used as time traceability information. Therefore, it is possible to deliver time information at low cost to a user terminal connected to a general-purpose network such as the Internet while guaranteeing a desired time system and delivery route.
In addition, since the clock unit for measuring the monitoring time is provided and the time monitoring for the time distribution is performed in the time distribution device, the time monitoring is performed with high security without requiring a clock device outside the device. be able to.

In addition, in the time delivery system using the time delivery device without a clock function, the same effects as the time delivery system using the time delivery device with a clock function can be obtained except for the point relating to the clock unit.
At this time, the monitoring timepiece device can perform time monitoring in parallel for a plurality of time distribution devices. Therefore, it is not necessary to mount a clock unit in each time delivery device, as compared with the case where the time delivery system is configured with only the time delivery device with a clock function, so that the hardware scale of the entire time delivery system can be reduced and reduced. Time delivery can be realized at low cost.

Next, embodiments of the present invention will be described with reference to the drawings.
[Time delivery system]
First, the time delivery system according to the present embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a time distribution system according to the present embodiment of the present invention.
The time delivery system of FIG. 1 is a system that delivers time information generated by the time source device 1 to the user terminal 2 via the network 3. This time delivery system includes a time delivery device 10 (10A, 10B), a monitoring clock device 20, a log collection device 30, a command relay device 40, and an operation terminal 50, and a network for data communication such as the Internet. 3 to each other.

The time delivery device 10 is connected to another time delivery device 10 or a user terminal 2 from the time source device 1 side such as the time source device 1 or another time delivery device 10 along a transfer path provided on the network 3. The time information is sequentially delivered to the user terminal 2 side.
The time delivery device 10 includes a time delivery device 10A with a clock function and a time delivery device 10B without a clock function. The time delivery device 10A has a clock function for measuring a monitoring time different from the internal time of its own device used for time delivery, and the time delivery device 10B does not have such a clock function. Only one or both of these time delivery devices 10A and 10B may be used.

  In the present embodiment, in the time delivery device 10A, time information is sequentially delivered from the time source device 1 side to the user terminal 2 side by the time delivery unit along a transfer path provided on the network 3, and a predetermined frequency The monitoring time is counted by the clock unit (clock function) by the signal, the internal time of the own device used for the delivery of time information by the time distribution unit is monitored by the time monitoring unit based on the monitoring time, and received by the time distribution unit The transmission source of the time information is monitored by the route monitoring unit, and the result of the processing operation in each unit is stored as log information in the log storage unit. In the log collection device, the log reception unit receives the log information from the log storage unit of the time distribution device 10A with the clock function via the network 3, and the log information collected by the log reception unit is stored in the log storage unit. It is what you do.

  In the time delivery device 10B, the time delivery unit sequentially delivers the time information from the time source device 1 side to the user terminal 2 side along the transfer path provided on the network 3, and is used for delivery of the time information. The internal time of the own device is delivered to the monitoring clock device 20 via the network 3 as the monitoring target time, the transmission source of the time information received by the time delivery unit is monitored by the route monitoring unit, and the processing operations in these units are performed. The result is stored in the log storage unit as log information. In the monitoring clock device 20, the time distribution unit receives the monitoring target time delivered from the time distribution device without a clock function, and the monitoring unit measures the monitoring time with a predetermined frequency signal, and the monitoring target time is monitored. Based on the time, monitored by the time monitoring unit, the source of the time information received by the time distribution unit is monitored by the route monitoring unit, and the processing operation results at these units are stored as log information in the log storage unit It is. In the log collection device, the log reception unit receives the log information from the log storage unit of the time distribution device 10B having no clock function and the monitoring clock device 20 via the network 3, and the log information collected by the log reception unit Is stored in the log storage unit.

[Time delivery device (with clock function)]
Next, with reference to FIG. 2, the configuration of a time delivery device (with a clock function) used in the time delivery system according to the embodiment of the present invention will be described in detail. FIG. 2 is a block diagram showing a configuration of a time delivery device (with a clock function) used in the time delivery system according to the embodiment of the present invention.

  This time delivery device 10A is a communication device that performs data communication via the network 3, and includes a time delivery unit 11, a clock unit 12, a frequency monitoring unit 13A, a route monitoring unit 13B, a time monitoring unit 13C, setting information 14, an alarm. A transmission unit 15, an operation signal reception unit 16, an OS control unit 17, a log storage unit 18, and a log collection unit 19 are provided.

  These functional units are realized by a dedicated circuit unit, an arithmetic processing unit, and a storage unit. Among them, the arithmetic processing unit has a CPU and its peripheral circuits, and implements various functional units by reading a program from the CPU or a memory or storage unit of the peripheral circuit and executing it. The storage unit includes a storage device such as a hard disk or a memory, and stores various processing information and programs such as setting information 14 used in the dedicated circuit unit and the arithmetic processing unit.

  The timepiece unit 12 receives a frequency signal CLK from a method different from that of the time source device 1, for example, GPS, a synchronous line, a high-precision oscillator, and the like, and has a function of driving a timepiece circuit internally based on the frequency signal CLK. A function of transmitting the time information generated by the circuit to the time distribution unit 11;

  The time delivery unit 11 has a function of measuring the internal time used for delivery of time information, and the time source device 1 side such as the time source device 1 and other time delivery devices 10 along the transfer path provided on the network 3. A function for receiving the time information 60A from the network, a function for synchronizing the internal time with the received time information 60A, a function for generating the time information 60B based on the internal time, A function of sequentially delivering to the user terminal 2 such as the time delivery device 10 or the user terminal 2, a function of acquiring a monitoring time from the clock unit 12 when the time information 60B is transmitted, and an internal time at which the time information 60B is generated As a monitoring target time.

  In addition, the time delivery unit 11 transmits the contents and results of the time delivery operation to the log storage unit 18 as time delivery log information, including the internal time used to generate the delivered time information and the monitoring time acquired at that time. A function for transmitting various operation information of the time distribution unit 11 to the operation signal receiving unit 16 when receiving an operation information acquisition command from the operation signal receiving unit 16, a frequency monitoring unit 13A, a path monitoring unit 13B, It has a function of stopping the delivery of time information in response to a time delivery stop command from the time monitoring unit 13C or the operation signal receiving unit 16. At this time, instead of the time delivery stop command, time delivery is performed when a time delivery permission signal has not been received from the frequency monitoring unit 13A, the route monitoring unit 13B, the time monitoring unit 13C, or the operation signal receiving unit 16 for a predetermined period. You may make it stop.

  The frequency monitoring unit 13A monitors a change in the reception frequency of the frequency signal CLK received by the clock unit 12, and notifies the alarm transmission unit 15 of an abnormal frequency state and time distribution when the reception frequency changes significantly. It has a function of transmitting a stop command to the time distribution unit and a function of transmitting the contents and results of the frequency monitoring operation of the frequency signal CLK to the log storage unit 18 as frequency monitoring log information. At this time, instead of the time delivery stop command, a time delivery permission signal may be transmitted to the time delivery unit 11 when there is no change in the reception frequency.

  The route monitoring unit 13B has a function of confirming a delivery source of time information to be received by the time delivery unit 11 according to a predetermined delivery route from the setting information 14 of the storage unit, and time delivery log information output by the time delivery unit 11 The function of confirming the delivery source of the time information actually received by the time delivery unit 11 from the function of checking the delivery route of the time information by periodically comparing these delivery sources, and the delivery source differ by the examination When an error in the delivery route is confirmed, the alarm transmission unit 15 is notified of the abnormal state and a time delivery stop command is transmitted to the time delivery unit 11, and the contents and result of the delivery route monitoring operation are used as route monitoring log information. And a function of transmitting to the log storage unit 18. At this time, instead of the time delivery stop command, when the delivery destinations match and the normal delivery route is confirmed by inspection, a time delivery permission signal may be transmitted to the time delivery unit 11.

  The time monitoring unit 13C periodically obtains a time error between the internal time indicating the delivery time in the time delivery unit 11 and the monitoring time based on the time delivery log information output by the time delivery unit 11, and the time error. And a function for monitoring the time by comparing each error range set in stages in the setting information 14 of the storage unit, and an error status is sent to the alarm transmission unit 15 every time the time error exceeds each error range. A function for notifying a change, a function for notifying the alarm transmission unit 15 of an abnormal state when the time error exceeds a normal error range, that is, an allowable range, and a function for transmitting a time delivery stop command to the time delivery unit 11; It has a function of transmitting the contents and result of the monitoring operation to the log storage unit 18 as time monitoring log information. At this time, instead of the time delivery stop command, if the time error is within the allowable range, a time delivery permission signal may be transmitted to the time delivery unit 11.

  The alarm transmission unit 15 has a function of transmitting information indicating an abnormal state to a designated operator or the operation terminal 50 when various abnormal states are notified from the frequency monitoring unit 13A, the route monitoring unit 13B, or the time monitoring unit 13C. And a function of transmitting the content and result of the transmission operation to the log storage unit 18 as alarm log information.

  The operation signal receiving unit 16 has a function of transmitting a time delivery stop command to the time delivery unit 11 when receiving a time delivery stop command from the operation terminal 50 or the monitoring clock device 20 in response to an operator's operation, and an operator operation In response to a device operation information acquisition command, a device operation command signal, a time distribution unit operation information acquisition command, or a log information acquisition command received from the operation terminal 50, the OS control unit 17 and the time distribution unit 11 respond to these signals. Or a function for acquiring desired information from the log storage unit 18, a function for transmitting the acquired information to the operation terminal 50, and a content and result of the operation according to these operations as operation signal reception log information. And a function of transmitting to E.18.

The OS control unit 17 has a function of controlling the operation of the entire time distribution device 10A as an OS (operation system).
When the log collection unit 19 receives a log collection command from the log collection device 30, the log collection unit 19 acquires the specified log information from the log storage unit 18, and the acquired log information in the specified format to the log collection device 30. It has the function to transmit.

  The log storage unit 18 has a function of storing various log information received from the time distribution unit 11, the frequency monitoring unit 13A, the route monitoring unit 13B, the time monitoring unit 13C, the alarm transmission unit 15, and the operation signal receiving unit 16 in the storage unit. A function for saving device log information indicating the contents and results of the operation and status of the device received from the OS control unit 17 to the storage unit, and a specification when receiving a log information acquisition command from the operation signal receiving unit 16 A function of acquiring the received log information and transmitting it to the operation signal receiving unit 16. The log storage destination is configured so that no log loss occurs when a failure occurs.

[Time delivery device (no clock function)]
Next, with reference to FIG. 3, the configuration of a time delivery device (with a clock function) used in the time delivery system according to the embodiment of the present invention will be described in detail. FIG. 3 is a block diagram showing a configuration of a time delivery device (without a clock function) used in the time delivery system according to the present embodiment of the present invention. The same or equivalent parts as those in FIG. It is.

  The time delivery device 10B is a communication device that performs data communication via the network 3, and includes a time delivery unit 11, a route monitoring unit 13B, setting information 14, an alarm transmission unit 15, an operation signal reception unit 16, and an OS control unit 17. A log storage unit 18 and a log collection unit 19 are provided.

  These functional units are realized by a dedicated circuit unit, an arithmetic processing unit, and a storage unit. Among them, the arithmetic processing unit has a CPU and its peripheral circuits, and implements various functional units by reading a program from the CPU or a memory or storage unit of the peripheral circuit and executing it. The storage unit includes a storage device such as a hard disk or a memory, and stores various processing information and programs such as setting information 14 used in the dedicated circuit unit and the arithmetic processing unit.

  Compared with the time delivery device 10A, the time delivery device 10B is omitted from the clock unit 12, the frequency monitoring unit 13A and the time monitoring unit 13C related thereto, and the time monitoring for the time information to be delivered is for monitoring. This is performed in the timepiece device 20.

  The time delivery unit 11 has a function of measuring the internal time used for delivery of time information, and the time source device 1 side such as the time source device 1 and other time delivery devices 10 along the transfer path provided on the network 3. A function for receiving the time information 60A from the network, a function for synchronizing the internal time with the received time information 60A, a function for generating the time information 60B based on the internal time, A function of sequentially delivering to the user terminal 2 side such as the time delivery device 10 or the user terminal 2, and a function of delivering the internal time at which the time information 60B is generated to the monitoring clock device 20 as a monitoring target time. Yes.

  In addition, the time delivery unit 11 includes a function for transmitting the contents and results of the time delivery operation to the log storage unit 18 as time delivery log information, including the internal time used to generate the delivered time information, and an operation signal receiving unit. When the operation information acquisition command is received from 16, according to the function of transmitting the various operation information of the time distribution unit 11 to the operation signal reception unit 16 and the time distribution stop command from the route monitoring unit 13 </ b> B or the operation signal reception unit 16. And the function of stopping time delivery. At this time, the time distribution may be stopped when the time distribution permission signal is not received from the route monitoring unit 13B or the operation signal receiving unit 16 for a predetermined period.

When an abnormal state is notified from the route monitoring unit 13B, the alarm transmission unit 15 transmits a function for transmitting information indicating the abnormal state to a designated operator or the operation terminal 50, and details and results of the transmission operation are transmitted to the alarm log. It has a function of transmitting to the log storage unit 18 as information.
Note that the route monitoring unit 13B, the operation signal receiving unit 16, the log storage unit 18, and the log collection unit 19 are the same as those of the time delivery device (with clock function) 10A described above, and a description thereof is omitted here.

[Monitoring clock device]
Next, with reference to FIG. 4, the configuration of the monitoring timepiece device used in the time distribution system according to the embodiment of the present invention will be described in detail. FIG. 4 is a block diagram showing the configuration of the monitoring timepiece device used in the time distribution system according to the embodiment of the present invention.

  The monitoring clock device 20 includes a communication device that performs data communication via the network 3, and includes a time distribution unit 21, a clock unit 22, a frequency monitoring unit 23A, a route monitoring unit 23B, a time monitoring unit 23C, and an operation signal transmission unit. 23D, setting information 24, alarm transmission unit 25, operation signal reception unit 26, OS control unit 27, log storage unit 28, and log collection unit 29 are provided.

  These functional units are realized by a dedicated circuit unit, an arithmetic processing unit, and a storage unit. Among them, the arithmetic processing unit has a CPU and its peripheral circuits, and implements various functional units by reading a program from the CPU or a memory or storage unit of the peripheral circuit and executing it. The storage unit includes a storage device such as a hard disk or a memory, and stores various processing information and programs such as setting information 24 used in the dedicated circuit unit and the arithmetic processing unit.

  The time delivery unit 21 has a function of measuring the internal time, a function of synchronizing the internal time with the monitoring time read from the clock unit 22, a function of receiving the monitoring target time from the time delivery devices 10A and 10B, and this monitoring. The function of transmitting the contents and results of the time reception operation including the target time and the internal time (monitoring time) at the time of receiving the monitoring target time to the log storage unit 28 as time reception log information, and obtaining operation information from the operation signal receiving unit 26 When a command is received, the function of transmitting various operation information of the time distribution unit 21 to the operation signal receiving unit 26 and the frequency monitoring unit 23A, the route monitoring unit 23B, the time monitoring unit 23C, or the operation signal receiving unit 26 A function of stopping reception of the monitoring time in response to the time delivery stop command. At this time, when the time distribution permission signal is not received for a predetermined period from the frequency monitoring unit 23A, the route monitoring unit 23B, the time monitoring unit 23C, or the operation signal receiving unit 26, reception of the monitoring time is stopped. Also good.

  The time monitoring unit 23C is a time error between the monitoring target time from the time delivery devices 10A and 10B received by the time delivery unit 21 based on the time reception log information output by the time delivery unit 21 and the internal time (monitoring time) at that time. A function for periodically determining the time, a function for monitoring the time by comparing the time error with each error range set in stages in the setting information 24 of the storage unit, and a time error for each error range. A function for notifying the alarm transmitter 25 of a change in the error state every time it exceeds, and when the time error exceeds a normal error range, that is, an allowable range, the alarm transmitter 25 is notified of the abnormal state and the abnormality is detected. A function for transmitting information including a time delivery device and data including a time delivery stop command to the operation signal transmission unit 23D, and details and results of these time monitoring operations are displayed in the time monitoring log information. And a function of transmitting to the log storage unit 28 as. At this time, instead of the time delivery stop command, if the time error is within the allowable range, information indicating the corresponding time delivery devices 10A and 10B and data including the time delivery permission signal are transmitted to the operation signal transmission unit 23D. May be.

  When the operation signal transmission unit 23D receives data including a time distribution stop command from the time monitoring unit 23C, the operation signal transmission unit 23D has a function of transmitting a time distribution stop command to the time distribution devices 10A and 10B included in the data. ing. At this time, instead of the time delivery stop command, when data including the time delivery permission signal is received from the time monitoring unit 23C, the time delivery permission command is transmitted to the time delivery devices 10A and 10B included in the data. It may be.

  Note that the clock unit 22, the frequency monitoring unit 23A, the route monitoring unit 23B, the alarm transmission unit 25, the operation signal reception unit 26, the OS control unit 27, the log storage unit 28, and the log collection unit 29 are the same as the time delivery device 10A described above. Similar to the clock unit 12, the frequency monitoring unit 13A, the route monitoring unit 13B, the alarm transmission unit 15, the operation signal reception unit 16, the OS control unit 17, the log storage unit 18, and the log collection unit 19 described in (see FIG. 2). The description is omitted here.

[Log collection device]
Next, the configuration of the log collection device used in the time distribution system according to the embodiment of the present invention will be described in detail with reference to FIG. FIG. 5 is a block diagram showing the configuration of the log collection device used in the time delivery system according to the present embodiment of the present invention.
The log collection device 30 includes a communication device that performs data communication via the network 3, and includes a log collection timing adjustment unit 31, a log collection command transmission unit 32, a log reception unit 33, a log storage unit 34, an alarm transmission unit 35, An operation signal receiving unit 36 and an OS control unit 37 are provided.

  These functional units are realized by a dedicated circuit unit, an arithmetic processing unit, and a storage unit. Among them, the arithmetic processing unit has a CPU and its peripheral circuits, and implements various functional units by reading and executing a program from the CPU or from the memory or storage unit of the peripheral circuit. The storage unit includes a storage device such as a hard disk or a memory, and stores various processing information and programs used in the dedicated circuit unit and the arithmetic processing unit.

  The log collection timing adjustment unit 31 uses, as a log collection command, information indicating the name of the log information to be collected and the collection form from the time delivery devices 10A and 10B, the monitoring clock device 20, and the command relay device 40 to be collected. It has a function of transmitting to the log collection command transmitting unit 32 and a function of stopping log collection when a log collection stop command is received from the operation signal receiving unit. There are two types of collection modes: differential acquisition and full acquisition.

  When the log collection command transmission unit 32 receives a log collection command from the log collection timing adjustment unit 31, the log collection command transmission unit 32 collects the specified log information for the target device of the log collection specified by the log collection command. A function to send signals collected by difference acquisition or all file acquisition according to the form and alarm transmission when it is judged that an error state has occurred, for example, due to detection of no response of the time delivery device or reception of a rejection signal of the time delivery device A function of notifying the unit 35 of the error state, a function of transmitting the contents and results of a log collection instruction operation such as log collection command reception, log file collection signal transmission, error state, etc. have.

  The log receiving unit 33 has a function of receiving log information from the time delivery devices 10A and 10B, the monitoring clock device 20, and the command relay device 40, and an abnormal end during log reception, for example, from the time delivery device, When it is determined that an error state is detected according to the detection of no log reception, the function for notifying the alarm transmission unit 35 of the error state and the contents and results of the log collection operation such as the log reception procedure, the log reception state, and the error state And a function of transmitting the collected operation log information to the log storage unit 34.

The log storage unit 34 has a function of receiving various log information from the log collection command transmission unit 32 and the log reception unit 33, performing time authentication on the log information, and storing a set of log information and authentication information in the storage unit. Have.
The alarm transmission unit 35, when notified of various error states from the log collection command transmission unit 32 or the log reception unit 33, transmits information indicating the error state to a designated operator or the operation terminal 50, and its transmission. It has a function of transmitting the operation contents and results to the log storage unit 34 as alarm log information.

The OS control unit 37 has a function of controlling the operation of the entire time delivery device 10A as an OS (operation system).
The operation signal receiving unit 36 has a function of transmitting a log collection stop command to the log collection timing adjusting unit 31 when receiving a log collection stop signal input by the operator from the operation terminal, and a device operation information acquisition command from the operation terminal 50. When a device operation command signal, a time delivery unit operation information acquisition command, or a log information acquisition command is received, a function for acquiring desired information from the OS control unit 37 or the log storage unit 34 according to these signals, and the acquired information And a function for transmitting the contents and results of the operation corresponding to these operations to the log storage unit 34 as operation signal reception log information.

[Command relay device]
Next, with reference to FIG. 6, the configuration of the command relay device used in the time distribution system according to the embodiment of the present invention will be described in detail. FIG. 6 is a block diagram showing the configuration of the command relay device used in the time distribution system according to the present embodiment of the present invention.

  The command relay device 40 includes a communication device that performs data communication via the network 3, and includes a command reception unit 41, a command transmission unit 42, a log storage unit 43, and a log collection unit 44.

  These functional units are realized by a dedicated circuit unit, an arithmetic processing unit, and a storage unit. Among them, the arithmetic processing unit has a CPU and its peripheral circuits, and implements various functional units by reading and executing a program from the CPU or from the memory or storage unit of the peripheral circuit. The storage unit includes a storage device such as a hard disk or a memory, and stores various processing information and programs used in the dedicated circuit unit and the arithmetic processing unit.

  The command receiving unit 41 has a function of receiving command data including a set of an operator name, an operator level, an execution command, and an execution target device from the operation terminal 50, and the execution command specified by the command data is permitted to the operator level. If the command is a command, a log consisting of a function of sending the data consisting of a combination of the execution command and the execution target device to the command transmission unit 42 and a set of operator name, operator level, execution command, execution device, and execution permission flag A function of transmitting information to the log storage unit 43, a function of transmitting the contents to the log storage unit 43 when a command execution result is received from the command transmission unit 42, and an unpermitted after command execution by the command transmission unit 42 If it turns out to be a command, the operator name, operator level, It has line commands, and log information comprising a set of non-executable flag and a function of transmitting to the log storage unit.

The command transmission unit 42 has a function of receiving data consisting of a combination of an execution command and an execution device from the command reception unit 41, a function of transmitting the execution command to the execution device after transmitting this data to the log storage unit 43, It has a function of receiving a command execution result from the execution device and storing the content in the log storage unit 43 and transmitting the execution result to the command reception unit 41.
Note that the log storage unit 43 and the log collection unit 44 have the same functions as the log storage unit 18 and the log collection unit 19 described in the above time distribution device 10A (see FIG. 2). Description is omitted.

  The command relay device 40 performs data communication with the time distribution devices 10 </ b> A and 10 </ b> B, the monitoring clock device 20, the log collection device 30, and the operator terminal 50 through a secure communication path via the network 3. Thereby, the command relay device 40 from a third party avoids unauthorized access to the time distribution devices 10A and 10B, the monitoring clock device 20, and the log collection device 30, and impersonates the operator terminal 50 by a third party terminal. It is avoiding.

[Operation of time delivery system]
Next, the operation of the time delivery system according to the present embodiment of the present invention will be described in detail with reference to FIGS. 7 and 8 are flowcharts showing the time monitoring process of the time delivery device (with clock function) used in the time delivery system according to the embodiment of the present invention. FIG. 9 is a flowchart showing a route monitoring process of the time delivery device (with a clock function) used in the time delivery system according to the embodiment of the present invention.

[Operation of time delivery device]
First, the time monitoring operation of the time delivery device (with a clock function) 10A will be described with reference to FIGS. The time delivery apparatus 10A uses an Internet protocol for data communication related to time delivery. In particular, the time distribution unit 11 uses NTP (Network Time Protocol), and the route monitoring unit 13B and the time monitoring unit 13C perform monitoring using a log output by NTP.

The time monitoring unit 13C of the time delivery device 10A periodically executes the time monitoring processing of FIGS. 7 and 8 by using the CRON function of the UNIX (registered trademark) system.
First, the time monitoring unit 13C reads the setting information 14 from the storage unit, and sets a time delivery stop command flag (Fstop) indicating whether or not a time delivery stop command needs to be transmitted as an option setting for the time monitoring process (step 100). Similarly, for the time delivery device 10 (TE) to be inspected, two values of a warning level (lw) and a critical level (lc) are read from the setting information 14 as time error threshold values (step 101).

Subsequently, only the portion updated from the log information read at the previous activation is read as difference log information from the log information of the log storage unit 18 (step 102), and the variable Data and the control flag Fw are initialized (step 103). .
Thereafter, the time difference is read from the first line of the difference log information (step 104), and the time difference (Dt) obtained when the time information is delivered from the time delivery device 10 (TE) to be inspected is read. (Step 105), the time difference Dt is compared with the warning level lw (Step 110).

If the time difference Dt exceeds the warning level lw (step 110: YES), error log information including the inspection target TE and the time difference Dt is output to the alarm transmission unit 15 as a change in error state. (Step 111), the control flag Fw is set (Step 112), and the inspection object TE and the time difference Dt are set in the variable Data (Step 113).
When the time difference Dt does not exceed the warning level lw (step 110: NO) or after step 113, the time difference Dt is compared with the critical level lc (step 120).

Here, when the time difference Dt exceeds the critical level lc (step 120: YES), error log information including the inspection target TE and the time difference Dt is output to the alarm transmission unit 15 as a change in the error state. At the same time (step 121), the inspection object TE and the time difference Dt are set in the variable Data (step 122).
Then, an error notification including the contents set in the variable Data is transmitted to the alarm transmission unit 15 as an abnormal state (step 123). Thereby, information indicating the abnormal state is transmitted from the alarm transmission unit 15 to the designated operator and the operation terminal 50.

Subsequently, when the time delivery stop command flag (Fstop) is set to transmission required (1) (step 124: YES), a time delivery stop command is sent to the time delivery unit 11 (step 125). Thereby, when the time difference Dt exceeds the critical level lc and is determined to be in an abnormal state, the time distribution operation in the time distribution unit 11 is stopped.
Thereafter, when the time difference Dt does not exceed the critical level lc at step 120 (step 120: NO), when the time delivery stop command flag (Fstop) is set to transmission unnecessary (0) at step 124 (step) 124: NO), or after step 125, the presence or absence of readable difference log information is confirmed (step 130).

If readable differential log information remains (step 130: YES), the next line is read from the differential log information (step 131), and time information from the inspection target (TE) is delivered. The time difference (Dt) obtained is read in (step 132), and the process returns to the above-described step 110 to repeat the time monitoring for the time difference Dt.
On the other hand, when all the difference logs have been read in step 130 (step 130: NO), only when the control flag Fw indicates valid (1) (step 133: YES), the process proceeds to step 123 and the warning level is set. When an error notification related to the detected last test result is transmitted to the alarm transmission unit 15 as an abnormal state and the control flag Fw indicates invalidity (0) (step 133: NO), the series of time monitoring operations is terminated.

Next, a route monitoring operation of the time delivery device (with a clock function) 10A will be described with reference to FIG. The route monitoring unit 13B of the time delivery apparatus 10A periodically executes the route monitoring process of FIG. 9 using the CRON function of the UNIX system.
First, the route monitoring unit 13B reads the setting information 14 from the storage unit, and sets a time delivery stop command flag (Fstop) indicating whether or not a time delivery stop command needs to be transmitted as an option setting for time monitoring processing (step 200). Similarly, a flag (Fp [k]) indicating the time synchronization destination (P [k]) and the time synchronization target / reference target is read from the setting information 14 (step 201).

  Subsequently, only the part updated from the log information read at the previous activation is read as difference log information from the log information of the log storage unit 18 (step 202), and the time difference is read from the first one line (step 203). Then, a time synchronization destination (Ps) and a flag (Fps) indicating whether to be synchronized / referenced are read (step 204). Further, the control flags Fp and Fe and the control variable I are initialized (step 205).

  Next, all of P [k] and Fp [k] are compared with Ps and Fps, and it is checked that P [I] and Ps are equal and that Fp [I] and Fps are equal (steps 210 to 213). ). Here, when P [I] and Fp [I] equal to Ps and Fps are not found (step 220: NO), the time synchronization destination (Ps) and the abnormal state indicating the out-of-setting synchronization are sent to the alarm transmitter 15. Output (step 221). If P [I] and Ps are equal, but Fp [I] and Fps are not equal (step 222: NO), the alarm transmission unit 15 indicates the time synchronization destination (Ps) and an abnormal state indicating out-of-setting synchronization. (Step 223).

  After these steps 221, 223, if the time delivery stop command flag (Fstop) is set to transmission required (1) (step 224: YES), a time delivery stop command is sent to the time delivery unit 11 (step 225). ). Thereby, when the time difference Dt exceeds the critical level lc and is determined to be in an abnormal state, the time distribution operation in the time distribution unit 11 is stopped.

Subsequently, when P [I] and Fp [I] equal to Ps and Fps are found in step 222 (step 222: NO), the time delivery stop instruction flag (Fstop) is set to transmission unnecessary (0) in step 224. If it is determined (step 224: NO) or after step 225, the presence / absence of readable difference log information is checked (step 230).
Here, when the readable difference log information remains (step 230: YES), the next line is read from the difference log information (step 231), and the process returns to step 204 to return the time synchronization destination (Ps) and the synchronization target. / Reads a flag (Fps) indicating the reference target and repeatedly executes the above-described route monitoring.
On the other hand, if all the difference logs have been read in step 230 (step 230: NO), the series of time monitoring operations is terminated.

Next, operations of the frequency monitoring unit 13A, the alarm transmission unit 15, and the log storage unit 18 of the time distribution device (with a clock function) 10A used in the time distribution system according to the embodiment of the present invention will be described.
For the frequency monitoring of the frequency monitoring unit 13A, for example, it is conceivable to use a frequency monitoring method disclosed in Japanese Patent Laid-Open No. 2003-344571. When a time delivery unit operation information acquisition command is received from the operation signal receiving unit 16, NTP information, for example, the time source device 1, the clock unit 12, or the user terminal, using an NTP management tool such as an ntpq (ntp Query) command 2 is acquired and transmitted.

The alarm transmission unit 15 notifies the operator terminal 50 of the occurrence of an abnormal state using SNMP (Simple Network Management Protocol) or electronic mail.
The log storage unit 18 stores log information acquired from each unit in a storage unit such as a hard disk. In this case, a mirroring system may be used so that log information is not lost when a hard disk failure occurs. However, it is not always necessary to continue operation in the event of a disk failure. The log information requested by the log collection device 30 includes log information related to the operation status of the device, log information related to device operation, log information related to time delivery, and various monitoring result log information. As the acquisition format, difference acquisition at short intervals and log collection for the last day in a day unit are performed.

  In the time delivery system according to the embodiment of the present invention, the time delivery device (with a clock function) 10A can monitor the delivery time by the monitoring clock device 20 in addition to the time monitoring using the clock unit 12. It is. In this case, the monitoring clock device 20 monitors the delivery time in the time delivery device 10A, and when an abnormality is detected, the monitoring clock device 20 transmits a time delivery stop command to the time delivery device 10A. In the time delivery apparatus 10 </ b> A, when the operation signal receiving unit 16 receives the time delivery stop command, the time delivery stop command is transmitted to the time delivery unit 11. The time delivery unit 11 stops time delivery in response to the time delivery stop command.

  The time delivery device (without clock function) 10B does not perform frequency monitoring in the case of the time delivery device (with clock function) 10A, but the route monitoring performs the same processing as the time delivery device 10A described above. Done. The time monitoring is performed by the monitoring clock device 20 in the same manner as the time delivery device 10A.

[Operation of log collection device]
Next, the operation of the log collection device used in the time delivery system according to the embodiment of the present invention will be described in detail.
The log collection command transmission unit 32 and the log reception unit 33 of the log collection device 30 use the Internet protocol for data communication regarding log information. The time delivery apparatuses 10A and 10B employ a method of starting data communication after performing authentication using IPsec (Security Architecture for Internet Protocol), SSH (Secure SHell), or the like.

  The log collection timing adjustment unit 31 performs log acquisition at a frequency of once every 30 minutes, for example, and collects log information for the previous day once a day. If the time delivery devices 10A and 10B become inaccessible due to a failure, the log files can be recovered as much as possible even if the time delivery devices 10A and 10B become inaccessible for several days by combining the data obtained by the difference. To implement.

If the time delivery devices 10A and 10B store the data by mirroring, the log information that could not be acquired by the log collection device 30 can be collected after the time delivery devices 10A and 10B are recovered.
The log storage unit 34 stores the log information collected from each device in a storage unit such as a hard disk. At this time, a RAID 1 (mirroring) configuration may be used as the hard disk, and a controller that does not stop when a disk failure occurs may be selected. Alternatively, two log collection devices 30 may be prepared, and when one log collection device 30 is stopped due to a failure, the remaining log collection devices 30 may be activated immediately.

[Operation of operation terminal and command relay device]
Next, operations of the operation terminal and the command relay device used in the time distribution system according to the embodiment of the present invention will be described in detail.
In the time delivery system according to the present embodiment, the operator who operates the operation terminal 50 includes an operator who performs normal system management work, a level 2 operator who has authority to stop / start each function of each device, NTP settings, They are classified in advance into senior operators who have authority to rewrite access to keys used for setting / restarting of each device and authentication at the time of connection, and audit operators who audit operations.

  A recording medium (not shown) such as an IC card is handed to each operator, and a command that can be executed in each device is assigned. The executed command and the history of the executor are all stored in the command relay device 40, and this information is stored in the log collection device through the log collection unit.

  The operator cannot execute commands other than the status display. The level 2 operator can execute the stop / restart of each function in addition to the commands that can be executed by the operator. The operator and the level 2 operator can use only an interface for executing a command through the network with respect to each device other than the command relay device 40 and the log collection device 30, and do not have means for directly operating the device. However, the collection information name (file name) of the log collection device 30 can be acquired through the network. The senior operator can operate each device other than the command relay device and the log collection device through the network. However, the collection information name of the log collection device can be acquired through the network. The audit operator can operate the command relay device and the log collection device through the network.

  The time delivery devices 10A and 10B, the monitoring clock device 20, the log collection device 30, and the command relay device 40 constituting the time delivery system according to the present embodiment do not have a physically connected control terminal. In addition, installation of the control device at the device installation location is not permitted. If it becomes impossible to control, it is removed from the system and then transferred from the installation location to the repair location for repair.

[Action / Effect]
As described above, according to the present embodiment, the time delivery unit 11 sequentially delivers the time information from the time source device 1 side to the user terminal 2 side along the transfer path provided on the network 3 in the time delivery device 10A. Then, the time for monitoring is counted by the clock unit (clock function) 12 by a predetermined frequency signal, and the internal time of the device used for the delivery of the time information by the time delivery unit 11 is determined by the time monitoring unit 13C based on the monitoring time. The transmission source of the time information received by the time distribution unit 11 is monitored by the route monitoring unit 13B, and the result of the processing operation in each unit is stored in the log storage unit 18 as log information. In the log collection device 30, the log reception unit 33 receives the log information from the log storage unit 18 of the time delivery device 10 </ b> A with the clock function via the network 3, and the log information collected by the log reception unit 33 is logged. The storage unit 34 stores the data.

Thus, the time information delivered by the time delivery device 10A is desired based on the monitoring time of the clock unit 12 without requiring a special dedicated line or network such as a digital line of a digital synchronous network using an optical path. And the delivery route of the time information delivered by the time delivery device 10A can be guaranteed. Also, log information related to time delivery is stored in the log collection device 30 and can be easily used as time traceability information. Therefore, it is possible to deliver time information at low cost to a user terminal connected to a general-purpose network such as the Internet while guaranteeing a desired time system and delivery route.
In addition, since the clock unit 12 for measuring the monitoring time is provided and the time monitoring for the time distribution is performed in the time distribution device 10A, the time monitoring is performed with high security without requiring a clock device outside the device. It can be performed.

  In the time delivery device 10B, the time delivery unit sequentially delivers the time information from the time source device 1 side to the user terminal 2 side along the transfer path provided on the network 3, and is used for delivery of the time information. The internal time of the own device is delivered to the monitoring clock device 20 via the network 3 as the monitoring target time, the transmission source of the time information received by the time delivery unit is monitored by the route monitoring unit, and the processing operations in these units are performed. The result is stored in the log storage unit as log information. In the monitoring clock device 20, the time distribution unit receives the monitoring target time delivered from the time distribution device without a clock function, and the monitoring unit measures the monitoring time with a predetermined frequency signal, and the monitoring target time is monitored. Based on the time, monitored by the time monitoring unit, the source of the time information received by the time distribution unit is monitored by the route monitoring unit, and the processing operation results at these units are stored as log information in the log storage unit It is. In the log collection device, the log reception unit receives the log information from the log storage unit of the time distribution device 10B having no clock function and the monitoring clock device 20 via the network 3, and the log information collected by the log reception unit Is stored in the log storage unit.

As a result, operations and effects similar to those of the time delivery device 10 </ b> A can be obtained except for the point related to the clock unit 12.
Further, the monitoring clock device 20 can perform time monitoring in parallel for a plurality of time delivery devices 10B. Therefore, it is not necessary to mount the clock unit 12 in each time delivery device 10A as compared with the case where the time delivery system is configured by only the time delivery device 10A, and thus the hardware scale of the entire time delivery system can be reduced and reduced. Time delivery can be realized at low cost.

Further, since the frequency monitoring unit 13A is provided for the time delivery device 10A and the frequency of the frequency signal CLK used in the clock unit 12 is monitored, the accuracy of the monitoring time counted by the clock unit 12 can be guaranteed. .
In addition, when an abnormality is detected as a result of monitoring by the time monitoring unit 13C, the route monitoring unit 13B, and the frequency monitoring unit 13A, the time distribution operation in the time distribution unit 11 is stopped. The time delivery devices 10A and 10B that cannot perform time delivery can be automatically disconnected from the time delivery system, and the time delivery accuracy of the entire time delivery system can be maintained.
These effects can also be obtained by the monitoring timepiece device 20.

  Further, when the log information collected from each device is stored by the log storage unit 34 of the log collection device 40, for example, an external time authentication system is used to perform time authentication for authenticating the time at the time of storage. Therefore, when using these saved log information at a later date, high evidence is obtained.

It is a block diagram which shows the structure of the time delivery system concerning this Embodiment of this invention. It is a block diagram which shows the structure of the time delivery apparatus (with a clock function) used with the time delivery system concerning this Embodiment of this invention. It is a block diagram which shows the structure of the time delivery apparatus (without a clock function) used with the time delivery system concerning this Embodiment of this invention. It is a block diagram which shows the structure of the monitoring timepiece apparatus used with the time delivery system concerning this Embodiment of this invention. It is a block diagram which shows the structure of the log collection apparatus used with the time delivery system concerning this Embodiment of this invention. It is a block diagram which shows the structure of the command relay apparatus used with the time delivery system concerning this Embodiment of this invention. It is a flowchart which shows the time monitoring process of the time delivery apparatus (with a clock function) used with the time delivery system concerning this Embodiment of this invention. It is a flowchart (continuation) which shows the time monitoring process of the time delivery apparatus (with a clock function) used with the time delivery system concerning this Embodiment of this invention. It is a flowchart which shows the route monitoring process of the time delivery apparatus (with a clock function) used with the time delivery system concerning this Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Time source apparatus, 2 ... User terminal, 3 ... Network, 10A ... Time delivery apparatus (with clock function), 10B Time delivery apparatus (without clock function), 11 ... Time delivery part, 12 ... Clock part, 13A ... Frequency monitoring unit, 13B ... path monitoring unit, 13C ... time monitoring unit, 14 ... setting information, 15 ... alarm transmission unit, 16 ... operation signal receiving unit, 17 ... OS control unit, 18 ... log storage unit, 19 ... log collection , 20 ... monitoring clock device, 21 ... time delivery unit, 22 ... clock unit, 23A ... frequency monitoring unit, 23B ... path monitoring unit, 23C ... time monitoring unit, 24 ... setting information, 25 ... alarm transmission unit, 26 Operation signal receiving unit 27 OS control unit 28 Log storage unit 29 Log collection unit 30 Log collection device 31 Log collection timing adjustment unit 32 Log collection command transmission unit 33 Log reception Part 34 ... Storage unit 35 ... Alarm transmission unit 36 ... Operation signal reception unit 37 ... OS control unit 40 ... Command relay device 41 ... Command reception unit 42 ... Command transmission unit 43 ... Log storage unit 44 ... Log collection Department.

Claims (12)

A time delivery system for delivering time information generated by a time source device that measures a desired reference time to a user terminal via a network,
A time distribution unit that sequentially distributes time information from the time source device side to the user terminal side along a transfer path provided on the network, and a clock unit that measures a monitoring time by a predetermined frequency signal; A time monitoring unit that monitors the internal time of the device used for delivery of time information in the time delivery unit based on the monitoring time, and a route monitoring unit that monitors the transmission source of the time information received by the time delivery unit And a time delivery device with a clock function having a log storage unit that stores the contents of processing operations in these units as log information;
A log collection device comprising: a log reception unit that receives log information from a log storage unit of the time distribution device with a clock function via the network; and a log storage unit that stores the log information collected by the log reception unit It equipped with a door,
The time distribution device with a clock function further includes a frequency monitoring unit that monitors the frequency by comparing the frequency of the frequency signal with a predetermined allowable range, and the time distribution when the frequency exceeds the allowable range A time delivery system , wherein delivery of time information is stopped by a unit . A time delivery system for delivering time information generated by a time source device that measures a reference time to a user terminal via a network,
The time information is sequentially delivered from the time source device side to the user terminal side along the transfer path provided on the network, and the internal time of the own device used for delivery of the time information is used as the monitoring target time. A time delivery unit that delivers to the monitoring clock device, a route monitoring unit that monitors the transmission source of the time information received by the time delivery unit, and a log that saves the contents of processing operations in these units as log information A time delivery device without a clock function having a storage unit;
A time distribution unit that receives a monitoring target time distributed from the time distribution device without a clock function via the network, a clock unit that measures a monitoring time by a predetermined frequency signal, and the monitoring target time for the monitoring A time monitoring unit that monitors based on the time, a route monitoring unit that monitors the transmission source of the monitoring target time received by the time distribution unit, and a log storage unit that stores the contents of processing operations in these units as log information A monitoring clock device comprising:
A log receiving unit that receives log information from each log storage unit of the time distribution device without a clock function and a monitoring clock device via the network, and a log storage unit that stores the log information collected by the log receiving unit and a logging device with bets,
The monitoring clock device monitors the frequency by comparing an operation signal transmission unit that transmits various instructions to the time distribution device without a clock function via the network and a frequency of the frequency signal with a predetermined allowable range. A frequency monitoring unit that transmits a time information delivery stop instruction to the time function-less time delivery device by the operation signal transmission unit when the frequency exceeds an allowable range,
The time distribution device without a clock function further includes an operation signal receiving unit that receives various instructions via the network, and when the operation signal receiving unit receives a delivery stop instruction from the monitoring clock device, the time A time delivery system , wherein delivery of time information is stopped by a delivery unit . The time delivery system according to claim 1,
The time information is sequentially delivered from the time source device side to the user terminal side along the transfer path provided on the network, and the internal time of the own device used for delivery of the time information is used as the monitoring target time. A time delivery unit that delivers to the monitoring clock device, a route monitoring unit that monitors the transmission source of the time information received by the time delivery unit, and a log that saves the contents of processing operations in these units as log information A time delivery device without a clock function having a storage unit;
A time distribution unit that receives a monitoring target time distributed from the time distribution device without a clock function via the network, a clock unit that measures a monitoring time by a predetermined frequency signal, and the monitoring target time for the monitoring A time monitoring unit that monitors based on the time, a route monitoring unit that monitors the transmission source of the monitoring target time received by the time distribution unit, and a log storage unit that stores the contents of processing operations in these units as log information A monitoring clock device having
The log receiving unit of the log collection device receives log information from each log storage unit of the time delivery device with a clock function, the time delivery device without the clock function, and the monitoring clock device via the network. A time delivery system characterized by In the time delivery system according to claim 1 or claim 3,
In the time distribution device with a clock function, the time monitoring unit compares a time error between the internal time and the monitoring time with a predetermined allowable error, and when the time error exceeds the allowable error, the time distribution is performed. A time delivery system, wherein delivery of time information is stopped by a unit. In the time delivery system of Claim 2 or Claim 3,
The monitoring clock device further includes an operation signal transmission unit that transmits various instructions to the time distribution device without a clock function via the network, and the time monitoring unit monitors the time distribution device without the clock function. A time error between the target time and the monitoring time is compared with a predetermined allowable error, and if the time error exceeds the allowable error, the operation signal transmission unit issues a time information distribution stop instruction to the time distribution device without the clock function Send to
The time distribution device without a clock function further includes an operation signal receiving unit that receives various instructions via the network, and when the operation signal receiving unit receives a delivery stop instruction from the monitoring clock device, the time A time delivery system, wherein delivery of time information is stopped by a delivery unit. In the time delivery system according to claim 1 or claim 3,
In the time distribution device with a clock function, the route monitoring unit compares the transmission source of the time information with the transmission source corresponding to the transfer route, and when the transmission sources are different, the time distribution unit distributes the time information. A time delivery system characterized by stopping the operation. In the time delivery system of Claim 2 or Claim 3,
The time delivery device without a clock function compares the transmission source of the monitoring target time with the transmission source according to the transfer route by the route monitoring unit, and if these transmission sources are different, the time delivery unit A time delivery system characterized by stopping delivery. In the time delivery system of Claim 2 or Claim 3,
The monitoring clock device further includes an operation signal transmission unit that transmits various instructions to the time distribution device without a clock function via the network, and the route monitoring unit includes a transmission source and a monitoring target of the monitoring target time. When these transmission sources are different, the operation signal transmission unit transmits a time information delivery stop instruction to the time delivery device without a clock function,
The time distribution device without a clock function further includes an operation signal receiving unit that receives various instructions via the network, and when the operation signal receiving unit receives a delivery stop instruction from the monitoring clock device, the time A time delivery system, wherein delivery of time information is stopped by a delivery unit. In the time delivery system according to claim 1 or claim 3,
In the time delivery device with a clock function, the log storage unit uses, as the log information, delivery result information regarding a delivery operation of time information in the time delivery unit and monitoring results in the time monitoring unit and the route monitoring unit. A time delivery system characterized by storing. In the time delivery system of Claim 2 or Claim 3,
The time delivery device without a clock function stores, as the log information, delivery result information related to a delivery operation of time information in the time delivery unit and a monitoring result in the route monitoring unit by the log storage unit. A time delivery system. In the time delivery system of Claim 2 or Claim 3,
In the monitoring clock device, the log storage unit stores the reception result information of the time information in the time distribution unit and the monitoring results in the time monitoring unit and the route monitoring unit as the log information. A featured time delivery system. In the time delivery system in any one of Claims 1-3,
The log collection device performs time authentication for authenticating a time when the log storage unit stores the log information collected by the log reception unit when the log information is collected by the log storage unit.

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