Station-side optical termination device, optical communication method, and optical communication program

Abstract

To provide a station-side optical termination device, an optical communication method, and an optical communication program to obtain a power-saving effect while reducing frame loss.SOLUTION: A station-side optical termination device (1) comprises: an accumulation unit (7) that accumulates communication data from a plurality of subscriber-side optical termination devices and communicates with a host network; and a sleep control unit (9) that manages a sleep state of the accumulation unit (7). The sleep control unit (9) comprises: a data acquisition unit (12) that acquires traffic data for each user; a database (13) that accumulates the traffic data in association with time information; a statistical analysis unit (14) that analyzes the traffic data accumulated in the database and generates statistical information indicating a change in a time series of the probability that the rate of increase in the actual amount of traffic exceeds a predetermined increase rate threshold; and a processing unit (15) that determines, on the basis of the traffic data and the statistical information, a transition to and cancellation of the sleep state of the accumulation unit (7).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a station-side optical terminal device, an optical communication method, and an optical communication program. [Background technology]

[0002] The PON (Passive Optical Network) system, an optical communication system, is becoming popular due to its low cost and low power consumption. A PON system consists of an optical line terminal (OLT) located on the carrier side, which is the base station equipment, and multiple optical network units (ONUs) located on the subscriber side, which are the slave station equipment. The OLT and ONUs are connected by optical fibers and optical splitters.

[0003] In recent years, with the increasing demand for reducing greenhouse gas emissions, further power saving is also required for PON systems. Various technologies have been proposed for power saving in PON systems. For example, Patent Document 1 discloses a technology in which a switch (hereinafter referred to as a "signal processing unit") accommodating multiple OSUs (Optical Subscriber Units, hereinafter referred to as "PON transceivers") of an OLT is divided into two parts, Signal Processing Unit 1 and Signal Processing Unit 2, and when the upstream signal capacity of the entire OLT is below a threshold set to a value lower than the maximum switching capacity of Signal Processing Unit 1, the upstream signal is allocated to Signal Processing Unit 1 and the Signal Processing Unit 2 and the physical port (hereinafter referred to as an optical transceiver) connected to Signal Processing Unit 2 are put into sleep mode, thereby achieving a power saving effect. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-146784 Summary of the Invention [Problem to be solved by the invention]

[0005] In OLTs, the signal processor consumes a lot of power. To maximize power-saving effects, it is desirable to set the signal processor and optical transceiver to a full sleep state, in which both are powered off. However, transitioning the signal processor from a full sleep state to an active (ACT) state where it can conduct electricity requires time for initialization, resulting in frame loss until startup is complete. For this reason, the threshold for waking up from full sleep must be set with a certain margin relative to the maximum switching capacity of the signal processor, and startup must be timed to accommodate an increase in frames. As a result, the signal processor's sleep time is shortened, reducing the power-saving effect.

[0006] Furthermore, the technology disclosed in Patent Document 1 does not take into consideration the startup time of the signal processing unit, and for the above-mentioned reason, there is a problem that frame loss occurs when traffic suddenly increases, and there is room for improvement.

[0007] The present disclosure aims to provide a central office optical terminal device, an optical communication method, and an optical communication program that achieve power saving effects while suppressing frame loss. [Means for solving the problem]

[0008] The optical terminal device disclosed herein is an optical terminal device on an optical line side that accommodates a plurality of optical terminal devices on a customer side and includes one or more PON transceiver units that transmit and receive communication data to and from the optical terminal devices on a customer side, two accumulation units that accumulate communication data from the PON transceiver units and communicate with an upper network, and a sleep control unit that manages the sleep state of the accumulation units. The sleep control unit includes a data acquisition unit that acquires traffic data that is the actual traffic volume for each user, a database that accumulates the traffic data in association with time information of the optical terminal device on the customer side, a statistical analysis unit that analyzes the traffic data accumulated in the database and generates statistical information that indicates changes over time in the probability that the rate of increase in the actual traffic volume will exceed a predetermined increase rate threshold, and a processing unit that determines whether the accumulation units should transition to or cancel the sleep state based on the traffic data and the statistical information.

[0009] The optical communication method disclosed herein is an optical communication method executed by a computer, and includes the steps of transmitting and receiving communication data to and from a plurality of subscriber-side optical terminal devices, accumulating the communication data from the subscriber-side optical terminal devices and communicating with an upper network, acquiring traffic data that is the actual traffic volume for each user, correlating the traffic data with time information of the station-side optical terminal device and storing it in a database, analyzing the traffic data stored in the database to generate statistical information that indicates changes over time in the probability that the rate of increase in the actual traffic volume will exceed a predetermined increase rate threshold, and determining, based on the traffic data and the statistical information, whether to transition to a sleep state or to release the step of accumulating communication data from the subscriber-side optical terminal devices and communicating with the upper network.

[0010] The optical communication program disclosed herein causes a computer to execute the steps of transmitting and receiving communication data to and from a plurality of subscriber-side optical terminal devices, collecting communication data from the subscriber-side optical terminal devices and communicating with an upper network, acquiring traffic data representing actual traffic volume for each user, storing the traffic data in a database in association with time information of the station-side optical terminal device, analyzing the traffic data stored in the database to generate statistical information indicating changes over time in the probability that the rate of increase in the actual traffic volume will exceed a predetermined increase rate threshold, and determining, based on the traffic data and the statistical information, whether to transition to and release a sleep state in the step of collecting communication data from the subscriber-side optical terminal devices and communicating with the upper network. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to provide a central office optical terminal device, an optical communication method, and an optical communication program that achieve power saving effects while suppressing frame loss. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram illustrating a configuration example of a PON system according to first and second embodiments. [Figure 2] 1 is a functional block diagram showing an example of the configuration of an OLT according to a first embodiment. [Figure 3] 4 is a flowchart showing an example of a power saving operation of the OLT according to the first embodiment. [Figure 4] FIG. 10 is a block diagram showing an example of the configuration of an OLT according to a second embodiment. [Figure 5] 10 is a flowchart showing an example of an operation when an OLT according to the second embodiment transitions from a full sleep state to a partial sleep state. DETAILED DESCRIPTION OF THE INVENTION

[0013] An optical line terminal (hereinafter referred to as "OLT") according to an embodiment will be described below with reference to the drawings. The following embodiments are merely examples, and the embodiments can be combined as appropriate and each embodiment can be modified as appropriate.

[0014] First Embodiment Fig. 1 is a schematic diagram showing an example of the configuration of a PON system 100 according to the first and second embodiments. In Fig. 1, an OLT 1 ​​accommodates a plurality of ONUs 5 via an optical fiber 2, an optical splitter 3, and an optical fiber 4. In general, the OLT 1 ​​is installed in a communication station, and the ONUs 5 are installed in users' homes.

[0015] 2 is a functional block diagram showing an example of the configuration of the OLT 1 ​​according to embodiment 1. FIG.

[0016] 2, the OLT 1 ​​includes one or more PON transmitting / receiving units 6 (6_1 to 6_n), two integrating units 7 (7_1, 7_2), an OLT control management unit 8, and a sleep control unit 9.

[0017] The PON transmitter / receiver 6 has an optical transmitter / receiver function for converting between electrical signals and optical signals, and a PON control function for performing data communication with multiple ONUs 5. Each PON transmitter / receiver 6 is connected to two accumulation units 7_1 and 7_2, respectively, and has a function for changing the allocation destination of communication data for each user (i.e., for each ONU 5). The allocation destination of communication data in the accumulation units 7_1 and 7_2 follows setting information held by the OLT control manager 8.

[0018] The integration units 7_1 and 7_2 have the function of integrating data signals from the PON transceiver unit 6 and connecting them to an upper network. The integration unit 7_1 is composed of a signal processing unit 10_1 and optical transceivers 11_1_1 to 11_1_m, and the integration unit 7_2 is composed of a signal processing unit 10_2 and optical transceivers 11_2_1 to 11_2_m. Each of the signal processing units 10_1 and 10_2 has a switching function of distributing communication data according to a VLAN (Virtual Local Area Network) ID included in the data signal. The allocation destination of the upper network in the signal processing units 10_1 and 10_2 follows setting information held by the OLT control management unit 8. The optical transceivers 11 (11_1_1 to 11_1_m, 11_2_1 to 11_2_m) have the function of converting between electrical signals and optical signals and connecting them to an upper network. Each of the two aggregation units 7_1 and 7_2 is connected to the upper network by link aggregation (LAG), which treats two routes as one logical link, and on the aggregation unit side, for example, LAG1 to LAGm are configured between the optical transceiver 11_1_1 and one of the optical transceivers 11_2_1 to 11_2_m. The communication capacity per LAG is 20 Gbps, for example, assuming one port is 10 Gbps.

[0019] The OLT control management unit 8 has the function of acquiring the operating status of the PON transceiver unit 6 and the accumulation units 7_1 and 7_2, controlling the PON transceiver unit 6 and the accumulation units 7_1 and 7_2, and storing and managing setting information required for control. The setting information may be, for example, user registration information or communication data distribution information.

[0020] The sleep control unit 9 has a function of instructing the accumulation unit 7_2 to select one of an active (ACT) state in which switching processing is performed, a complete sleep state in which the signal processing units 10_1 and 10_2 and all the optical transceivers 11 are turned off, and a partial sleep state in which only some of the optical transceivers 11 are turned off, and is composed of a data acquisition unit 12, a database 13, a statistical analysis unit 14, and a processing unit 15. The data acquisition unit 12 has a function of acquiring traffic data (actual traffic volume) for each user per unit time from the OLT control management unit 8. The actual traffic volume is counted, for example, using a traffic counter for each VLAN provided in the PON transceiver unit 6 or the accumulation units 7_1 and 7_2. The database has a function of storing traffic data in association with time information of the OLT 1. The statistical analysis unit 14 has a function of analyzing the traffic data stored in the database 13 and generating statistical information of the traffic data. The traffic data statistical information indicates, for example, the time periods when the actual traffic volume is likely to increase rapidly and the time periods when the probability is low, i.e., the time series change in the probability that the rate of increase in the actual traffic volume will exceed a predetermined threshold. The predetermined threshold is specifically determined taking into account the processing capacity of the OLT 1, etc. The processing unit 15 has the function of instructing each block of the sleep control unit 9 to perform processing operations and instructing the accumulator 7_2 to enter or exit the sleep mode. The determination of whether to enter the sleep mode is based on the actual traffic and statistical information on the traffic. During initial setup, the signal processing units 10_1 and 10_2 require time for startup because switching settings are made for each user based on the user information held by the OLT control management unit 8, whereas the optical transceiver 11 can be started up in a short time. Therefore, the full sleep mode effectively saves power but requires a long startup time, while the partial sleep mode has a relatively small power saving effect but requires a short startup time. Taking the above wake-up characteristics into consideration, the processing unit 15 uses actual traffic and traffic statistical information to determine whether to transition between the full sleep state and the partial sleep state. The sleep control unit 9 may be configured by a processing circuit.

[0021] The OLT 1 ​​shown in Fig. 2 is a type of computer, and may be configured such that a CPU (Central Processing Unit), main memory, input / output interface, and storage unit are all connected to one another via a system bus. The OLT 1 ​​may also be made up of multiple computers.

[0022] The CPU is an IC (Integrated Circuit) that performs arithmetic processing. In addition to the CPU, arithmetic elements such as a DSP (Digital Signal Processor) or a GPU (Graphics Processing Unit) may also be used. By executing an optical communication program, the CPU functions as the PON transceiver 6, the integration units 7_1 and 7_2, the OLT control manager 8, and the sleep controller 9. The optical communication program is provided, for example, as a recording medium on which these are recorded.

[0023] Next, the operation of the OLT 1 ​​according to embodiment 1 will be described. Fig. 3 is a flowchart showing an example of the power saving operation of the OLT 1 ​​according to embodiment 1. The power saving operation of the OLT 1 ​​is composed of (1) an instruction to perform a sleep operation and (2) a release of the sleep operation, as will be described later.

[0024] (1) Sleep operation instruction The power saving operation of the OLT 1 ​​is started when the accumulation unit 7_2 is in the ACT state. In order to determine whether to transition to the partial sleep state, the processing unit 15 calculates the traffic volume for each LAG by taking the total traffic for each LAG from the actual traffic acquired by the data acquisition unit 12 from the OLT control management unit 8 and the LAG setting information for each user stored in the OLT control management unit 8. The total traffic may be calculated by weighting the traffic volume in consideration of the user priority, etc. In step S111, the processing unit 15 compares the calculated traffic volume with threshold 1 (referred to as "threshold" in the claims) set to be equal to or less than the communication capacity per port of the aggregation unit 7_1, and determines whether there is any LAG that can transition to the partial sleep state. If there is any LAG that is less than threshold 1 in step S111, the processing unit 15 proceeds to step S112, and if there is no LAG that is less than threshold 1, the processing unit 15 proceeds to step S121. In step S112, if there is a LAG with a value less than threshold 1, the processing unit 15 determines that partial sleep transition is possible, and instructs the accumulation unit 7_2 to distribute all communication data of the LAG to the accumulation unit 7_1, and after the distribution is complete, instructs the accumulation unit 7_2 to turn off the optical transceiver 11 that constitutes the LAG. In step S113, it is determined whether all of the optical transceivers 11 (11_2_1 to 11_2_m) of the accumulation unit 7_2 are in a partial sleep state, and if all of the optical transceivers 11 of the accumulation unit 7_2 are in a partial sleep state, the procedure proceeds to step S114, and if all of the optical transceivers 11 of the accumulation unit 7_2 are not in a partial sleep state, the procedure proceeds to step S131. In step S114, the processing unit 15 refers to the statistical information of the statistical analysis unit 14 and compares the probability of a sudden increase in traffic during that time period with an arbitrary threshold 2 (referred to as a "probability threshold" in the claims) set by the OLT administrator in order to determine whether to transition to the full sleep state. In step S114, if the probability of a sudden increase in traffic during that time period is less than threshold 2, the procedure proceeds to step S115, and if the probability of a sudden increase in traffic during that time period is equal to or greater than threshold 2, the procedure proceeds to step S131. In step S115, the processing unit 15 determines that transition to the complete sleep state is possible, and turns off the power supply of the signal processing unit 10_2. In step S131, if all of the optical transceivers 11 of the integrating unit 7_2 are not in the partial sleep state, or if the probability of a sudden increase in traffic during the same time period is equal to or greater than threshold 2, the processing unit 15 shifts the procedure to step S111 after an arbitrary standby time has elapsed in a standby state in which the signal processing unit 10_2 maintains the partial sleep state with the power on, thereby preventing frame loss when traffic suddenly increases. Also, if the transition to the full sleep state has been made in step S131, the processing unit 15 shifts the procedure to step S111 after an arbitrary standby time has elapsed in a standby state in which the full sleep state is maintained.

[0025] (2) Canceling sleep mode If the traffic volume is equal to or greater than threshold 1 in step S111, in step S121, the processing unit 15 compares the traffic volume for each LAG with threshold 3, which is set to be equal to or less than the communication capacity per port of the aggregation unit 7-1 and equal to or greater than threshold 1, to determine whether or not there is a LAG that needs to transition to partial sleep mode. If, in step S121, there is a LAG with traffic equal to or greater than threshold 3, the procedure proceeds to step S122, and if there is no LAG with traffic equal to or greater than threshold 3, i.e., if there are only LAGs with traffic less than threshold 3, the procedure proceeds to step S125. At step S122, the processing unit 15 determines whether the signal processing unit 10_2 is in a power-on state. If the signal processing unit 10_2 is in a power-on state at step S122, the process proceeds to step S123, and if the signal processing unit 10_2 is in a complete sleep state and in a power-off state, the process proceeds to step S124. In step S124, the processing unit 15 transfers the switching setting information held by the OLT control management unit 8 to the signal processing unit 10_2 to activate it, and the procedure moves to step S123. In step S123, the processing unit 15 turns on the power of the optical transceiver 11 of the LAG in which the traffic is equal to or greater than the threshold 3, restarts the distribution of communication data to the accumulation unit 7_2, and moves the procedure to step S131. In step S125, in order to determine whether it is necessary to respond to a sudden increase in frames, the processing unit 15 refers to the statistical information of the statistical analysis unit 14 and compares the probability of a sudden increase in traffic during that time period with an arbitrary threshold value 4 (referred to as a "restart probability threshold value" in the claims) set by the OLT administrator. As an example, threshold value 4 is a value equal to or less than threshold value 2. When the processing unit 15 determines in step S125 that the probability of a sudden increase in traffic during that time period is equal to or greater than threshold value 4, it executes steps S122 to S124 to enter a partial sleep state, thereby shortening the wake-up time and thereby preventing frame loss when traffic suddenly increases. If it is determined in step S125 that the probability of a sudden increase in traffic during the same time period is less than threshold value 4, the procedure proceeds to step S131. In step S131, the processing unit 15 goes into a standby state in which the partial sleep state or the complete sleep state is maintained. After an arbitrary standby time has elapsed, the processing unit 15 shifts the procedure to step S111, and the above procedure is repeated.

[0026] As an example, each of the thresholds 1, 2, 3, and 4 is set statistically based on the actual traffic in the OTL1 and traffic statistical information, but may also be set for each LAG based on the priority of the service or the like.

[0027] As described above, the OLT 1 ​​according to the first embodiment of the present invention uses actual traffic and traffic statistical information for sleep judgment, and thereby becomes able to perform sleep operations according to the state of frames, such as entering a partial sleep state during times when there is a high probability of a sudden increase in traffic, thereby shortening the startup time and suppressing frame loss, and entering a full sleep state during times when there is a low probability of a sudden increase in traffic, thereby maximizing the power saving effect.

[0028] In the first embodiment, taking into consideration the difference in startup time between the signal processing unit 10_2 and the optical transceiver 11, when the probability of a sudden increase in traffic is high, frame loss can be reduced by using a partial sleep state in which the optical transceiver 11, which can be started up in a short time, is powered off, and when the probability of a sudden increase in traffic is low, power saving effects can be achieved by using a complete sleep state in which the signal processing unit 10_2 and the optical transceiver 11, which require time to start up, are powered off.

[0029] Second Embodiment Next, a second embodiment will be described. In the first embodiment, a method for achieving a power-saving effect while suppressing frame loss by changing the sleep state of the accumulation unit 7_2 based on the actual traffic volume and traffic statistical information has been described. In the first embodiment, the signal processing unit 10_2 and the optical transceiver 11 are powered off in the complete sleep state. However, if the startup time of the signal processing unit 10_2 itself can be shortened, frame loss can be further suppressed and the time of the complete sleep state can be extended, thereby improving the power-saving effect. The startup time of the signal processing unit 10_2 affects the number of switching settings at initialization. In the second embodiment, the actual traffic volume, traffic statistical information, and user priority information are used to order user settings (user accounts) set at the startup of the signal processing unit 10_2, thereby reducing the number of settings and thereby shortening the startup time. However, since the other configurations are the same as those in the first embodiment, the same reference numerals as those in the first embodiment are used and detailed description thereof will be omitted.

[0030] 4 is a block diagram showing an example of the configuration of an OLT 20 according to embodiment 2. The OLT 20 differs from the OLT 1 ​​according to embodiment 1 in that an initial setting holding unit 16 is provided in a sleep control unit 9 and is connected to a data acquisition unit 12 and a processing unit 15.

[0031] The initial setting holding unit 16 has the function of copying the switching setting information (e.g., VLAN setting, LAG setting, etc.) of the signal processing unit 10_2 held by the OLT control management unit 8 via the data acquisition unit 12, and holding it in association with the setting order determined by the processing unit 15.

[0032] When the signal processing unit 10_2 starts up, the processing unit 15 does not transfer the switching settings from the OLT control management unit 8 to the signal processing unit 10_2 all at once to set the signal processing unit 10_2, but instead refers to the initial setting holding unit 16 and sets the signal processing unit 10_2 based on the setting order stored in the initial setting holding unit 16 and the user setting associated with the setting order.

[0033] Next, a description will be given of the operation of the OLT 20 according to the embodiment 2. Fig. 5 is a flowchart showing an example of the operation of the OLT 20 according to the embodiment 2 when the OLT 20 transitions from a full sleep state to a partial sleep state.

[0034] In step S201, the processing unit 15 calculates the traffic volume to be processed when the accumulation unit 7_2 transitions to a partial sleep state from a traffic trend prediction based on the processing capacity margin of the accumulation unit 7_1 calculated from the actual traffic volume and traffic statistical information.

[0035] In step S202, the processing unit 15 determines which users are to be allocated to the accumulation unit 7_2 based on the user priority information held by the OLT control management unit 8 and the calculated traffic volume, and reflects the determined users as setting order 1 and the other users as setting order 2 in the initial setting holding unit 16. For example, in an LAG where the traffic volume exceeds threshold 3, one possible method is to allocate users whose service quality has been set as low priority by the OLT administrator among currently connected users and users whose traffic is expected to increase in the future to the accumulation unit 7_2 as users with setting order 1.

[0036] In step S203, the processing unit 15 calculates the startup time of the signal processing unit 10_2 from the setting time per user of the signal processing unit 10_2 and the number of users in setting order 1, and updates threshold 3 and threshold 4. When the number of set users is large, the startup time becomes long, so threshold 3 and threshold 4 are set low, and when the number of set users is small, the startup time becomes short, so threshold 3 and threshold 4 are set high.

[0037] In step S204, the processing unit 15 determines whether to cancel the sleep state in step S121 or step S125 of the first embodiment, and if it determines that the sleep state should be transitioned to the partial sleep state because the threshold value is equal to or greater than threshold value 3 or threshold value 4, the processing unit 15 proceeds to step S205. If it determines in step S204 that the partial sleep state cannot be transitioned to, the processing unit 15 proceeds to step S201.

[0038] In step S205, the processing unit 15 turns on the power of the signal processing unit 10_2 to start the initialization sequence, and in setting the switching process, refers to the initial setting holding unit 16 and transfers only the user settings of setting order 1 to the accumulation unit 7_2 to set the signal processing unit 10_2.

[0039] After the initialization sequence in step S205 is completed, in step S206, the processing unit 15 turns on the optical transceiver 11 of the LAG in the accumulation unit 7_2, and causes the PON transceiver unit 6 to resume distributing communication data to the accumulation unit 7_2, thereby establishing electrical continuity.

[0040] After the start of conduction for the user of setting order 1 in step S206, in step S207, the processing unit 15 refers to the initial setting holding unit 16, transfers the user setting of setting order 2 to the accumulation unit 7_2, sets the signal processing unit 10_2, and terminates the processing with the processing of all users being executed immediately.

[0041] As described above, according to the OLT 20 according to the second embodiment, the actual traffic volume, traffic statistical information, and user priority information are used to prioritize the user settings of the signal processing unit 10_2, thereby reducing the number of settings, thereby shortening the startup time. As a result, the frame loss can be further reduced, and in addition, the time in the complete sleep state is extended, thereby improving the power saving effect more than in the first embodiment.

[0042] In the first and second embodiments, the OLTs 1 and 20 that configure link aggregation between the upper network and the aggregation unit 7 and treat two routes as one logical link have been described, but the present invention is not limited to this. The techniques according to the first and second embodiments can also be applied to OLTs that do not configure link aggregation. [Explanation of symbols]

[0043] 1 OLT, 2 optical fiber, 3 optical splitter, 4 optical fiber, 5 ONU, 6 PON transceiver unit, 7 integration unit, 8 OLT control management unit, 9 sleep control unit, 10 signal processing unit, 11 optical transceiver, 12 data acquisition unit, 13 database, 14 statistical analysis unit, 15 processing unit, 16 initial setting storage unit, 20 OLT, 100 PON system.

Claims

1. A central office optical terminal device (OOT) accommodates a plurality of subscriber-side OOTs and includes one or more PON transceivers for transmitting and receiving communication data to and from the subscriber-side OOTs, two accumulation units for accumulating communication data from the PON transceivers and communicating the data with an upper network, and a sleep control unit for managing the sleep states of the accumulation units, The sleep control unit a data acquisition unit that acquires traffic data that is an actual traffic volume for each user; a database that stores the traffic data in association with time information of the optical line terminal; a statistical analysis unit that analyzes the traffic data stored in the database and generates statistical information that indicates a time-series change in the probability that the rate of increase in the actual traffic volume will exceed a predetermined threshold value of increase rate; a processing unit that determines whether the accumulation unit should transition to a sleep state or whether the accumulation unit should be released from the sleep state based on the traffic data and the statistical information; An optical terminal device on the central office side including:

2. the aggregation unit configures link aggregation between the upper network and the aggregation unit, treating two paths as one logical link; The processing unit calculates a traffic volume for each of the link aggregations from the traffic data and setting information of the link aggregation for each of the users, and places optical transceivers that mutually convert electrical signals and optical signals, in a partial sleep state by turning off power to the optical transceivers associated with the link aggregations for which the calculated traffic volume is less than a predetermined threshold.

2. The optical terminal device according to claim 1, wherein:

3. When all of the optical transceivers are in the partial sleep state, if the probability indicated by the statistical information is less than a predetermined probability threshold, the processing unit switches to a complete sleep state by turning off a power supply to a signal processing unit that performs switching processing of communication data in the integration unit, and if the probability is equal to or greater than the probability threshold, maintains a power-on state of the signal processing unit.

3. The optical terminal device according to claim 2, wherein:

4. the processing unit turns on the power supply of each of the optical transceivers and the signal processing units associated with the optical transceivers associated with the link aggregation for which the probability indicated by the statistical information is equal to or greater than a predetermined restart probability threshold that is equal to or less than the probability threshold in the complete sleep state.

4. The optical terminal device according to claim 3, wherein:

5. an initial setting storage unit that stores switching setting information of the signal processing unit in association with a setting order; The processing unit reflects the setting order, which is set based on the traffic data, the statistical information, and the user priority information, in an initial setting holding unit in association with a user setting set at the time of starting up the signal processing unit, and sets the signal processing unit at the time of starting up the signal processing unit based on the setting order stored in the initial setting holding unit and the user setting associated with the setting order.

5. The optical terminal device according to claim 4, wherein:

6. 1. A computer-implemented optical communication method comprising: transmitting and receiving communication data to and from a plurality of optical terminals on the customer side; a step of collecting communication data from the optical terminal device on the subscriber side and communicating the collected data with an upper network; acquiring traffic data representing actual traffic volume for each user; storing the traffic data in a database in association with time information of the optical line terminal; analyzing the traffic data stored in the database to generate statistical information indicating a time-series change in the probability that the growth rate of the actual traffic volume will exceed a predetermined growth rate threshold; a step of determining whether to transition to or release from a sleep state in a step of collecting communication data from the optical network terminal on the subscriber side and communicating with the upper network based on the traffic data and the statistical information; An optical communication method comprising:

7. transmitting and receiving communication data to and from a plurality of optical terminals on the customer side; a step of collecting communication data from the optical terminal device on the subscriber side and communicating the collected data with an upper network; acquiring traffic data representing actual traffic volume for each user; storing the traffic data in a database in association with time information of the optical line terminal; analyzing the traffic data stored in the database to generate statistical information indicating a time-series change in the probability that the growth rate of the actual traffic volume will exceed a predetermined growth rate threshold; a step of determining whether to transition to or release from a sleep state in a step of collecting communication data from the optical network terminal on the subscriber side and communicating with the upper network based on the traffic data and the statistical information; An optical communication program that causes a computer to execute the above.

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