JP5697524B2 - Telemeter system - Google Patents

Description

  The present invention relates to a telemeter system.

  Most telemeter systems perform simultaneous call control from a single monitoring station to a plurality of observation stations and obtain responses thereto. In this case, a polling method is adopted in which collective calls are made for reasons such as shortening the communication time, and responses are sequentially obtained. For example, an observation station that is normally in a standby state, when a radio wave transmitted from a monitoring station via a wireless line arrives from an aerial line, the squelch of the receiver opens and sends a squelch signal to the event detection unit. In the observation station, power (electric power) is constantly supplied to the receivers and event detection units that make up the standby power supply system, and the event detection unit inputs the squelch signal to the main power supply unit of the main power supply system. Send main power on signal. Receiving this, the main power supply unit starts supplying power to the main power supply system, and the observation station is activated. In this way, power is saved in the standby state by supplying power to the main power supply system only when necessary (see, for example, Patent Document 1).

  In addition, as a conventional telemeter system, a telemeter system configured to transmit and receive between a monitoring station and an observation station via a communication line using an IP (Internet Protocol) network, for example, one monitoring station can receive information on a plurality of observation stations. In a telemeter system in which monitoring is performed and a transmission frequency of information between the monitoring station and the observation station is a voice band, the monitoring station is connected to an IP network via a voice IP device, and the observation station is also a voice IP device. By connecting to the IP network via the network, it is possible to transmit / receive via a communication line by the IP network, enabling digital communication only with the voice IP device without passing through the multiplexing device, and from the monitoring station to the observation station Information distribution is one-to-many multicast distribution, greatly reducing network bandwidth consumption There is one (for example, see Patent Document 2).

JP 2002-204484 A JP 2009-076997 A

  The conventional telemeter system is configured as described above, and in the case of supplying power to the main power supply system only when necessary as described in Patent Document 1, the main power supply unit receiving the main power input signal is the main power supply system. In response to this, the observation station is activated. At this time, in the observation station that responds at the end of the observation stations, supply power to the main power supply system from the time the main power input signal is received until all other stations respond and the self ends the response. As a result, the amount of power consumption increases. For this reason, there is a demand for further reduction of power consumption. In addition, when the conventional wireless telemeter as described in Patent Document 2 is converted to IP, there is a problem that the power consumption is similarly large.

  The present invention has been made to solve the above-described problems, and provides a telemeter system capable of reducing power consumption, including a case where data transmission by a conventional wireless method is changed to an IP network method. With the goal.

In the telemeter system according to the present invention,
A telemeter system comprising a master station and a plurality of slave stations, and transmitting and receiving signals between the master station and the plurality of slave stations via an IP network using an optical communication network ,
The master station has a master station IP conversion device that converts the signal into an IP packet,
The slave station includes a power supply command transmission device, a power control device, an optical switch, a slave station IP conversion device that converts the signal into an IP packet, and a data storage device.
The power supply command transmission device has a slave station clock, and transmits a power supply command when the time of the slave station clock reaches a preset set time , and the set times include the plurality of set times. It is set to be shifted between the slave stations of
In response to the power supply command, the power control device supplies the data storage device with power necessary for the operation of the data storage device and stops supplying the power after a predetermined delay time has elapsed since the start of power supply. Is what
The optical switch is cascade-connected via an IP network by the optical communication network and transmits and receives the signal as an optical signal via the optical switch, and when the optical switch is not supplied with power, the optical switch The optical signal is propagated as it is to the adjacent slave station,
The data storage device is for storing data, said data to be self-holding during the delay time by receiving the supply of the power source Ru der those to be transmitted to the master station.

This invention
A telemeter system comprising a master station and a plurality of slave stations, and transmitting and receiving signals between the master station and the plurality of slave stations via an IP network using an optical communication network ,
The master station has a master station IP conversion device that converts the signal into an IP packet,
The slave station includes a power supply command transmission device, a power control device, an optical switch, a slave station IP conversion device that converts the signal into an IP packet, and a data storage device.
The power supply command transmission device has a slave station clock, and transmits a power supply command when the time of the slave station clock reaches a preset set time , and the set times include the plurality of set times. It is set to be shifted between the slave stations of
In response to the power supply command, the power control device supplies the data storage device with power necessary for the operation of the data storage device and stops supplying the power after a predetermined delay time has elapsed since the start of power supply. Is what
The optical switch is cascade-connected via an IP network by the optical communication network and transmits and receives the signal as an optical signal via the optical switch, and when the optical switch is not supplied with power, the optical switch The optical signal is propagated as it is to the adjacent slave station,
The data storage device is for storing data, since the data to be self-holding during the delay time by receiving the supply of the power source Ru der those to be transmitted to the master station,
A telemeter system capable of reducing power consumption can be obtained.

1 is a configuration diagram illustrating a configuration of a telemeter system according to a first embodiment. It is a block diagram which shows the structure of the telemeter system which is Embodiment 2. FIG. It is a block diagram which shows the structure of the telemeter system which is Embodiment 3. FIG. It is a block diagram which shows the structure of the telemeter system which is Embodiment 4. FIG. It is a block diagram which shows the structure of the telemeter system which is Embodiment 5. FIG. It is explanatory drawing which shows operation | movement of the optical switch of FIG.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing a configuration of a telemeter system according to Embodiment 1 for carrying out the present invention. In FIG. 1, a master station 1 and observation stations 10, 11 and 12 as slave stations are connected via an IP network 6. The master station 1 includes a TM monitoring station 101, an IP device 102, and a layer 2 switch (hereinafter referred to as L2 switch) 103. The TM monitoring station 101 performs simultaneous call control on a plurality of observation stations 10, 11, and 12 (described later), and obtains response to observation results. An L2 switch 103 is connected to the TM monitoring station 101 via the IP device 102. The IP converting apparatus 102 is for converting voice signals and serial data signals into IP packets and communicating via the IP network 6. The L2 switch 103 is for configuring an IP network and transferring IP packets.

  The observation station 10 includes an L2 switch 104, an IP device 105, a TM observation device 106 as a data storage device, a time difference setting device 107 as a power supply command transmission device, a power control device 108, a solar cell 109, and a storage battery 110. The TM observation device 106 is connected to the L2 switch 104 via the IP device 105. The TM observation device 106 receives and stores observation data from a sensor (not shown) such as a water level and rainfall, and the IP monitoring device 101, the L2 switch 104, and the IP network 6 are connected in response to a simultaneous call from the TM monitoring station 101. The observation data is responded (transmitted) to the TM monitoring station 101 via the network. The time difference setting device 107 is connected to the IP device 105. The power control device 108 is connected to the time difference setting device 107.

  The power supply control device 108 supplies the power (electric power) from the solar cell 109 and the storage battery 110 to the TM observation device 106 and others. That is, the power supply from the power supply control device 108 is divided into a group of the L2 switch 104 and the IP conversion device 105 and a group of the TM observation device 106 and is supplied by the power supply a system and the power supply b system. The observation stations 11 and 12 have the same configuration as the observation station 10, and the L2 switch 104 (not shown in the observation stations 11 and 12) and the L2 switch 103 of the master station 1 are cascade-connected. ing.

  Next, the operation will be described. First, the operation of the IP devices 102 and 105 will be described. The IP devices 102 and 105 perform simultaneous output from the TM monitoring station 101 in addition to conversion of observation data exchanged between the TM monitoring station 101 and the observation stations 10, 11, and 12 into IP packets. A paging signal (hereinafter referred to as a general paging signal) is converted to IP and transferred to the IP unit 105 of each observation station 10, 11, 12 via the L2 switches 103, 104. The TM monitoring station 101 When the simultaneous call signal is output from the IP, the IP device 105 in each of the observation stations 10, 11, 12 is input to the time difference setting device 107. After a predetermined time (details will be described later), the time difference setting device 107 supplies the power control device. A power supply command is output to 108.

  Next, the operation when the TM monitoring station 101 calls the observation stations 10, 11, and 12 all at once will be described. Normally, the power control device 108 of each observation station 10, 11, 12 supplies power (electric power) to the L2 switch 104 and the IP device 105. No power is supplied to the TM observation device 106. When the TM monitoring station 101 calls the observation stations all at once, the simultaneous call signal is sent via the IP device 102, the L2 switch 103, and the IP network 6 to the L2 switch 104 and the IP device of each of the observation stations 10, 11, and 12. The time difference is input to the time difference setting device 107 via 105. When the simultaneous calling signal is input, the time difference setting device 107 outputs a power supply command to the power control device 108 after a preset standby time Tn has elapsed. When receiving the power supply command, the power supply control device 108 supplies power from the solar cell 109 and the storage battery 110 to the TM observation device 106. That is, in response to the power supply command, the power is sequentially supplied to the TM observation devices 106 of the observation stations 10, 11, 12 after the standby time Tn (T1, T2, T3) has elapsed, and the observation stations 10, 11, 12 are Each is activated.

  Further, the power supply control device 108 delays each delay time ΔT1, from the start of power supply after the standby time Tn (T1, T2, T3) has elapsed to the TM observation devices 106 after the standby power T1 (T1, T2, T3) has elapsed. After ΔT2 and ΔT3 have elapsed, power supply to each TM observation device 106 is stopped. The standby times T1, T2, and T3 are predetermined times according to the order of responses from the observation stations 10, 11, and 12 to the TM monitoring station 101 and the response communication time, and are set to be shifted from each other. Also, the set value can be changed as appropriate. For example, the observation station 10 observes 1 second (T1 = 1) after the time difference setting device 107 receives the general paging signal, and the observation station 11 observes the second time (T2 = 2) after receiving the general paging signal. The station 12 outputs a power supply command to the power supply control device 108 three seconds (T3 = 3) after receiving the general call signal. The delay times ΔT1, ΔT2, and ΔT3 are times determined according to the response communication time, and the set values can be changed as appropriate. For example, ΔT1 = ΔT2 = ΔT3 = 0.5 seconds is set.

  By setting in this way, after the TM monitoring station 101 outputs a simultaneous call signal to call the observation stations 10, 11, and 12 all at once, the observation station 10 after about 1 second, the observation station 11, after about 2 seconds, After about 3 seconds, response communication is performed from the observation station 12, and the observation stations 10, 11, 12 that have completed the response sequentially stop supplying power to the TM observation apparatus 106. The TM monitoring station 101 does not output a general call signal until the next general call once the response is completed.

As described above, according to this embodiment, when the observation stations 10, 11, and 12 respond in response to simultaneous calls from the TM monitoring station 101, the observation stations 10, 11, and 12 each perform a net operation. Since power is supplied to the TM observation device 106 only when the power supply capacity is reduced, power consumption can be reduced.
In the above description, there are three observation stations. However, the number of observation stations is not limited.

Embodiment 2. FIG.
FIG. 2 is a configuration diagram showing the configuration of the telemeter system according to the second embodiment. In the first embodiment described above, the power supply command from the TM monitoring station 101 is transferred between the IP device 102 and the IP device 105. However, this embodiment transfers the power supply command by another method. It is composed of. In FIG. 2, the master station 2 is connected to observation stations 20, 21, and 22 as slave stations via an IP network 6. The master station 2 has a TM monitoring station 101, an IP device 102, and an L2 switch 203. The general call signal is transmitted from the TM monitoring station 101 to the L2 switch 203 without going through the IP device 102.

  The L2 switch 203 is the same as the L2 switch 103 in FIG. 1, and has a function as an IP conversion device that converts the power supply command from the TM monitoring station 101 into IP. The observation station 20 includes an L2 switch 204 as a first IP device and an IP device 205 as a second IP device. The power supply from the power control device 108 is divided into a group of the L2 switch 204 and a group of the IP device 205 and the TM observation device 106 by the power supply a system and the power supply b system. Power is supplied only to the group. The L2 switch 204 receives the IP call signal and outputs the call signal to the time difference setting device 107. Then, a power supply command is output from the time difference setting device 107 that has received the general call signal to the power control device 108 after a predetermined waiting time Tn. When receiving the power supply command, the power control device 108 also supplies power to the group of the IP device 205 and the TM observation device 106 via the power supply b system.

  The observation stations 21 and 22 have the same configuration as the observation station 20, and the L2 switch 204 (not shown in the observation stations 21 and 22) and the L2 switch 203 of the parent station 2 are cascade-connected. Yes. Since other configurations are the same as those of the first embodiment shown in FIG. 1, the same reference numerals are given to the corresponding components and the description thereof is omitted. Normally, the power control device 108 of each observation station 20, 21, 22 supplies power to the L2 switch 204 by the power system a. When the TM monitoring station 101 calls the observation stations 20, 21, and 22 at the same time, a simultaneous call signal is output from the L2 switch 204 of each observation station 20, 21, 22 to the time difference setting device 107. Is done. Then, in time difference setting device 107, a power supply command is output to power supply control device 108 after waiting times T1, T2, T3 after receiving the general call signal. Subsequent operations are the same as those in the first embodiment.

  According to the second embodiment, a general paging signal from the TM monitoring station 101 is transferred between the L2 switch 203 and the L2 switch 204, and the general paging signal is input from the L2 switch 204 to the time difference setting device 107. , The power supply command is output to the power supply control device 108, the power is supplied from the power supply control device 108 to the TM observation device 106, and the observation stations 20, 21, and 22 are sequentially activated. 105 does not need to be provided with a power supply command transfer function, and each observation station 20, 21, and 22 normally only needs to supply power to the L2 switch 204 as the first IP device. The power consumption can be further reduced than that shown in the first embodiment. Further, the present invention can be applied to a telemeter system for transmitting data by radio, for example, in which data input / output from the TM monitoring station 101 is not an IP packet and an IP conversion device is not provided.

Embodiment 3 FIG.
FIG. 3 is a configuration diagram showing the configuration of the telemeter system according to the third embodiment. In the first embodiment, the control of power supply to the observation stations 20, 21, and 22 based on the simultaneous call signal from the TM monitoring station 101 has been described. However, in this embodiment, it is performed by another method. It is composed of. In FIG. 3, the master station 1 is connected to observation stations 30, 31 and 32 as slave stations via the IP network 6. The observation station 30 includes a time control device 311 as a power supply command transmission device and a global positioning system (hereinafter referred to as GPS) clock 312 as a slave station clock. The time control device 311 receives a time signal from the GPS clock 312, monitors the response time (transmission time) of the observation data to the TM monitoring station 101 to the TM monitoring station 101, and supplies power to the power supply control device 108. Output a supply command.

  The GPS clock 312 is a GPS clock that can acquire highly accurate time information using GPS. The power supply from the power control device 108 is divided into a group of the L2 switch 104 and a group of the IP device 105 and the TM observation device 106, and is supplied by the power supply a system and the power supply b system. The observation stations 31 and 32 have the same configuration as the observation station 30, and the L2 switch 104 (not shown in the observation stations 31 and 32) and the L2 switch 103 of the master station 1 are cascade-connected. ing. Since other configurations are the same as those of the first embodiment shown in FIG. 1, the same reference numerals are given to the corresponding components and the description thereof is omitted.

  Next, the operation will be described. With the GPS clock 312, the observation stations 30, 31, and 32 can know the time with high accuracy, and the time control device 311 to which the time information from the GPS clock 312 is input reaches the preset time tn. The power supply command is output to the power controller 108 when the preset time tn is reached. The time tn is a time at which the TM monitoring station 101 should originally collect observation data, and can be arbitrarily set. For example, in the observation stations 30, 31, and 32, t1 = 12: 00: t00, t2 = 12: 00: 01, and t3 = 12: 00: 02 are set from 1 noon every 1 noon. Under normal conditions, the power control device 108 of each observation station 30, 31, 32 supplies power to the L2 switch 104, and does not supply power to the IP device 105 and the TM observation device 106.

  In each observation station 30, 31, 32, when a power supply command is output from the time control device 311 to the power control device 108, the IP controller 105 and the TM observation device are transmitted from the power control device 108 as in the first embodiment. Power is sequentially supplied to 106, and an activated state is entered. After power is supplied to the IP device 105 and the TM observation device 106 at times t1, t2, and t3, after the preset delay times ΔT1, ΔT2, and ΔT3 have elapsed, the IP device 105 and the TM observation device 106, respectively. The power supply to is stopped. The observation stations 30, 31, and 32 perform response communication to the TM monitoring station 101 in the same operation as in the first embodiment, and the observation stations 30, 31, and 32 that have completed the response sequentially perform the IP conversion device 105 and the TM observation device 106. Stop power supply to. The time controller 311 does not output a power supply command until the next response time when a predetermined time has elapsed.

  According to this embodiment, the GPS clock 312 is provided, and the time control device 311 controls the power supply from the power control device 108 to the TM observation device 106 based on accurate time information from the GPS clock 312 to Since the stations 30, 31, and 32 are normally configured so that power supply to the IP device 105 is not required, the power consumption of the observation station can be further reduced. Further, since it is not necessary to transfer a general call signal from the TM monitoring station 101, the apparatus can be made inexpensive. In this embodiment, a GPS watch that can acquire highly accurate time information is shown. However, a watch using another method may be used as long as the same function can be satisfied, and the accuracy is allowed as a system. A clock with a range of accuracy is sufficient.

Embodiment 4 FIG.
FIG. 4 is a configuration diagram showing the configuration of the telemeter system according to the fourth embodiment. In Embodiment 3 described above, the GPS clock 312 is provided in the observation station, but another configuration will be described with reference to FIG. In FIG. 4, the master station 4 is connected to observation stations 40, 41, 42 via the IP network 6. The master station 4 has a GPS clock server 401 as a master station clock. The GPS clock server 401 uses a network time protocol (hereinafter referred to as NTP) to provide highly accurate time information to the observation station 40 as a slave station.

  The observation station 40 includes a time control device 411 as a power supply command transmission device. The time control device 411 includes a self-timer (not shown). The time control device 411 has a function of connecting to the L2 switch 104 and acquiring highly accurate time information from the GPS clock server 401. Normally, the power supply control device 108 supplies power to the L2 switch 104 by the power supply system a and does not supply power to the IP device 105. The observation stations 41 and 42 have the same configuration as the observation station 40, and the L2 switch 104 (not shown in the observation stations 41 and 42) and the L2 switch 103 of the parent station 4 are cascade-connected. ing. Since other configurations are the same as those of the third embodiment shown in FIG. 3, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  Next, the operation will be described. Even when the time control device 411 operates based on a time based on a self-timer built in itself (not a GPS timepiece, not shown in FIG. 4) at the start of the first operation or the like, When the time reaches a preset time tn, a power supply command is output to the power supply control device 108. When the power supply command is output, power is supplied from the power supply control device 108 to the IP device 105 and the TM observation device 106 to start the operation, and the observation data is transferred from the observation station 40 to the TM monitoring station 101. The observation station 40 communicates with the GPS clock server 401 after the transfer of observation data, acquires high-accuracy time information, and corrects the time of the own clock to the acquired time.

  Thereafter, each time observation data is transferred to the TM monitoring station 101, communication is performed with the GPS clock server 401 to acquire highly accurate time information, and after correcting the time of the own clock to the acquired time information, the power supply is stopped. The The same applies to the operation of the observation stations 41 and 42. After the observation data is transferred, the high-accuracy time information, and the self-timer are corrected after being activated at predetermined times t2 and t3, the L2 switch by the power supply a system is used. The power supply to the time control device 411 is stopped. In this embodiment, the delay times ΔT4, ΔT5, and ΔT6 from the start of power supply to the observation stations 40, 41, and 42 until the end of the series of operations and the power supply stop are self-clocked. In consideration of the time required for the correction, the delay times ΔT1, ΔT2, and ΔT3 in the first embodiment are set slightly longer, for example, 0.6 seconds.

  By configuring as described above, the TM monitoring station 101 can collect observation data from each of the observation stations 40, 41, and 42 at a predetermined time tn (t1, t2, t3). On the other hand, when it is determined that the time of the time control device 411 of the observation stations 40, 41, and 42 is deviated from the response data received at the TM monitoring station 101, the observation data is discarded, It is possible to avoid capturing misaligned observation data.

According to this embodiment, instead of the GPS clock 312 of each observation station 30, 31, 32 in FIG. 3, one GPS clock server 401 is provided, and the time control device 411 acquires highly accurate time information, The time of the self-timer was corrected, and the power supply control to the TM observation device 106 and the response of the observation data from the TM observation device 106 were performed based on the highly accurate time obtained as a result. Therefore, it is not necessary to provide a plurality of GPS clocks 312 as in the third embodiment shown in FIG. 3, the power consumption of the observation station can be reduced, and the apparatus can be made inexpensive.
In this embodiment, the observation stations 40, 41, and 42 communicate with the GPS clock server 401 after the transfer of the observation data, acquire high-accuracy time information, and set the time of the own clock at the acquired time. Although what is to be corrected is shown, the frequency of communication with the GPS clock server can be changed according to the allowable value of the time lag in the system.
Further, in the first or second embodiment shown in FIG. 1 or FIG. 2, the master station 1 is provided with a GPS clock server 401 as a master station clock, and when the time of the GPS clock server 401 reaches a predetermined time, the GPS clock A simultaneous paging signal may be issued from the server 401 to the observation stations 10, 11, 12 or the observation stations 20, 21, 22.

Embodiment 5 FIG.
FIG. 5 is a configuration diagram showing the configuration of the telemeter system according to the fifth embodiment, and FIG. 6 is an explanatory diagram showing the operation of the optical switch. In Embodiments 3 and 4 described above, the power supply is normally always supplied to the L2 switch 104 of the observation station, but a configuration different from these will be described with reference to FIG. In FIG. 5, a master station 5 and observation stations 50, 51, 52 as slave stations are connected via an IP network 7 as an optical communication network. The master station 5 has an optical L2 switch 503. The observation station 50 includes an optical switch 511 and an optical L2 switch 504. The optical switch 511 has a function of switching optical signals. The observation stations 51 and 52 have the same configuration as the observation station 50, and the respective optical switches 511 (not shown in the observation stations 51 and 52) and the L2 switch 503 of the master station 5 are cascade-connected. ing. Since other configurations are the same as those of the third embodiment shown in FIG. 3, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 6 shows the operation of the optical switch 511. FIG. 6A shows the path of the optical signal when power is not supplied to the optical switch 511, and FIG. 6B shows that the power is supplied. The optical signal path is indicated by arrows. Normally, the power control device 108 supplies power only to the time control device 311 and the GPS clock 312. In this case, since no power is supplied to the optical switch 511, the optical signal is propagated to the path shown in FIG. That is, an optical signal input from the adjacent TM monitoring station 101 or the observation stations 50, 51, 52 via the IP network 7 is not transferred to the L2 switch 504, but is adjacent to the TM monitoring station 101 or the observation stations 50, 51. , 52 are transmitted to the optical switch 511. For example, in a normal case, when the observation station 50 needs to transmit observation data to the TM monitoring station 101 at a preset time tn, power is supplied to the optical switch 511 of the observation station 50, and FIG. ), The optical signal is propagated to the L2 switch 504, and the same operation as in FIG. 3 of the third embodiment is performed. Since no power is supplied to the optical switch 511 of the observation stations 51 and 52, the optical switch 511 propagates the optical signal as it is, so that an optical signal path between the observation station 50 and the TM monitoring station 101 is formed. Communication.

According to this embodiment, the optical switch 511 is provided in the optical input / output section of the observation stations 50, 51, 52, and normally the optical switch of the TM monitoring station 101 or the observation stations 50, 51, 52 adjacent to the optical signal is provided. Since it is propagated to 511 as it is, there is no influence on the communication with the TM monitoring station 101 of other observation stations, and it becomes possible to stop the power supply to the L2 switch 504 at all times. Power consumption can be reduced.
It can be combined with the embodiment shown in FIG.

1, 2, 4, 5 Master station, 6, 7 IP network,
10, 11, 12, 20, 21, 22, 30, 31, 32 observation stations,
40, 41, 42, 50, 51, 52 Observation station, 101 TM monitoring station,
102 IP device, 103, 104 L2 switch, 105 IP device,
106 TM observation device, 107 time difference setting device, 108 power supply control device,
203, 204 L2 switch, 205 IP conversion device, 311 time control device,
312 GPS clock, 401 GPS clock server, 411 time control device,
503,504 L2 switch, 511 Optical switch.

Claims (2)

A telemeter system comprising a master station and a plurality of slave stations, and transmitting and receiving signals between the master station and the plurality of slave stations via an IP network using an optical communication network ,
The master station has a master station IP conversion device that converts the signal into an IP packet,
The slave station includes a power supply command transmission device, a power control device, an optical switch, a slave station IP conversion device that converts the signal into an IP packet, and a data storage device.
The power supply command transmission device has a slave station clock, and transmits a power supply command when the time of the slave station clock reaches a preset set time , and the set times include the plurality of set times. It is set to be shifted between the slave stations of
In response to the power supply command, the power control device supplies the data storage device with power necessary for the operation of the data storage device and stops supplying the power after a predetermined delay time has elapsed since the start of power supply. Is what
The optical switch is cascade-connected via an IP network by the optical communication network and transmits and receives the signal as an optical signal via the optical switch, and when the optical switch is not supplied with power, the optical switch The optical signal is propagated as it is to the adjacent slave station,
The data storage device is for storing data, der Ru <br/> telemetry that transmits the data to the self-holding during the delay time by receiving the supply of the power to the master station system. The master station has a master station clock,
The telemeter system according to claim 1, wherein the power supply command transmission device obtains time information from the master station clock and corrects the time of the slave station clock .

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