Private branch exchange, power supply control method for private branch exchange, and program

Abstract

To provide a private branch exchange capable of reducing power consumption without interfering with communication services by effectively supplying power to an internal circuit.SOLUTION: A private branch exchange includes: recording means for detecting operation timing information including start-up information and operation stop information for each of an extension control circuit, an outside line control circuit, and a relay circuit, and recording the operation timing information as a log; calculation means for calculating, each time a predetermined period elapses, an operation frequency parameter for each of the extension control circuit, the outside line control circuit, and the relay circuit based on the operation timing information within the immediately preceding predetermined period, the operation frequency parameter becoming larger the higher the operation frequency; determination means for determining a power supply schedule for each of the extension control circuit, the outside line control circuit, and the relay circuit based on the magnitude of the operation frequency parameter; and a power supply control unit for supplying power generated by the power supply unit to each of the extension control circuit, the outside line control circuit, and the relay circuit in accordance with the power supply schedule.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a private branch exchange that reduces power consumption, a power supply control method for the private branch exchange, and a program. [Background technology]

[0002] Patent Document 1 discloses a technology that can significantly reduce the power consumption of a private branch exchange. The private branch exchange in Patent Document 1 is provided with a power supply unit that supplies power to each of the extension terminals, a terminal control unit that controls the extension terminals, and a main control unit that connects and controls the terminals via the terminal control unit. It also has an activation receiving circuit that monitors communication activation related to the extension terminals and stops or releases the power supply from the power supply unit to the main control unit. The activation receiving circuit stops the power supply from the power supply unit to the main control unit if no communication activation is detected for a predetermined period of time, and releases the power supply stop if communication activation related to the extension terminal is detected after the power supply stop. This allows power consumption to be reduced without interfering with normal communication operations related to each extension terminal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-214341 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology disclosed in Patent Document 1, the power supply from the power supply unit to the main control unit is stopped, so if a communication start related to an internal terminal is detected after the power supply is stopped, there is a delay until the main control unit can normally start connection control even if the power supply stop is released, which leads to a delay in communication services such as connection services.

[0005] Therefore, in view of the above, an object of the present invention is to provide a private branch exchange, a power supply control method, and a program that can reduce power consumption by effectively supplying power to internal circuits without interfering with communication services. [Means for solving the problem]

[0006] The private branch exchange of the present invention comprises: an extension control circuit for controlling an extension terminal; an outside line control circuit for controlling an outside line terminal; a relay circuit connected to the extension control circuit and the outside line control circuit for relaying communication between the extension control circuit and the outside line control circuit to provide communication services including telephone calls to the extension terminal and the outside line terminal; a power supply unit for generating power to be supplied to the extension control circuit, the outside line control circuit, and the relay circuit; a setting unit for setting a power supply schedule for each of the extension control circuit, the outside line control circuit, and the relay circuit; and a power supply control unit for supplying the power generated by the power supply unit to each of the extension control circuit, the outside line control circuit, and the relay circuit in accordance with the power supply schedule. the setting unit includes: a recording means for detecting operation timing information including start-up information and operation stop information for each of the extension control circuit, the outside line control circuit, and the relay circuit, and recording the operation timing information as a log; a calculation means for calculating, each time a predetermined period elapses, an operation frequency parameter for each of the extension control circuit, the outside line control circuit, and the relay circuit within the immediately preceding predetermined period based on the operation timing information, the operation frequency parameter becoming larger as the operation frequency becomes higher; and a determination means for determining the power supply schedule for each of the extension control circuit, the outside line control circuit, and the relay circuit based on the magnitude of the operation frequency parameter.

[0007] The power supply control method of the present invention is a power supply control method for a private branch exchange including an extension control circuit for controlling an extension terminal, an outside line control circuit for controlling an outside line terminal, a relay circuit connected to the extension control circuit and the outside line control circuit and relaying communication between the extension control circuit and the outside line control circuit to provide communication services including telephone calls to the extension terminal and the outside line terminal, and a power supply unit that generates power to be supplied to the extension control circuit, the outside line control circuit, and the relay circuit, the power supply unit detecting operation timing information including start information and operation stop information for each of the extension control circuit, the outside line control circuit, and the relay circuit, a step of recording information as a log; a step of calculating, at each lapse of a predetermined period, an operation frequency parameter that increases as the operation frequency increases for each of the extension control circuit, the outside line control circuit, and the relay circuit within the immediately preceding predetermined period based on the operation timing information; a step of determining a power supply schedule for each of the extension control circuit, the outside line control circuit, and the relay circuit based on the magnitude of the operation frequency parameter; and a step of supplying power generated by the power supply unit to each of the extension control circuit, the outside line control circuit, and the relay circuit in accordance with the power supply schedule.

[0008] The program of the present invention is a program for a power supply control method for a private branch exchange including an extension control circuit for controlling an extension terminal, an outside line control circuit for controlling an outside line terminal, a relay circuit connected to the extension control circuit and the outside line control circuit and relaying communication between the extension control circuit and the outside line control circuit to provide communication services including telephone calls to the extension terminal and the outside line terminal, and a power supply unit that generates power to be supplied to the extension control circuit, the outside line control circuit, and the relay circuit, the program comprising: a computer that detects operation timing information including activation information and operation stop information for each of the extension control circuit, the outside line control circuit, and the relay circuit; the step of recording operation timing information as a log; the step of calculating, at each lapse of a predetermined period, an operation frequency parameter that increases as the operation frequency increases for each of the extension control circuit, the outside line control circuit, and the relay circuit within the immediately preceding predetermined period based on the operation timing information; the step of determining a power supply schedule for each of the extension control circuit, the outside line control circuit, and the relay circuit based on the magnitude of the operation frequency parameter; and the step of supplying the power generated by the power supply unit to each of the extension control circuit, the outside line control circuit, and the relay circuit in accordance with the power supply schedule. [Effects of the Invention]

[0009] According to the private branch exchange, power supply control method, and program of the present invention, an operation frequency parameter indicating the operation frequency is calculated every predetermined period based on the operation timing information of each of the internal circuits, i.e., the extension control circuit, the outside line control circuit, and the trunk circuit; a power supply schedule is determined for each of the extension control circuit, the outside line control circuit, and the trunk circuit based on the magnitude of the operation frequency parameter; and power is supplied to each of the extension control circuit, the outside line control circuit, and the trunk circuit in accordance with the power supply schedule. As a result, power can be effectively supplied to the internal circuits, thereby reducing power consumption without interfering with communication services. [Brief explanation of the drawings]

[0010] [Figure 1]1 is a block diagram illustrating the configuration of a private branch exchange to which the present invention is applied; [Figure 2] 1 is a block diagram showing specific operations performed by each circuit in the private branch exchange as means, and information used in control operations. [Figure 3] 10 is a diagram showing an operation sequence relating to activation or deactivation of a control target circuit whose power supply is controlled by a second control circuit in the private branch exchange. FIG. [Figure 4] 10 is a diagram showing an operation sequence relating to the start-up of a control target circuit when a control request to the control target circuit, to which power supply is controlled by the second control circuit, times out. FIG. [Figure 5] 10 is a diagram showing an operation sequence when determining whether two controlled circuits are to be connected to a first control circuit or a second control circuit. FIG. [Figure 6] 10 is a flowchart showing a control circuit setting operation of each controlled circuit executed by a CPU. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0012] FIG. 1 is a block diagram illustrating a schematic example of a private branch exchange 1 to which the present invention is applied. The private branch exchange 1 is connected to an outside line terminal 2 via an outside line network 3 such as a public network or an IP (Internet Protocol) network, and is also connected to an extension terminal 5 via an extension network 6. The outside line terminal 2 and the extension terminal 5 are, for example, telephones, but are not limited to these. The private branch exchange 1 provides communication services, such as accepting incoming calls from the outside line terminal 2 or outgoing calls from the extension terminal 5, connecting the outside line terminal 2 and the extension terminal 5 to enable calls between the outside line terminal 2 and the extension terminal 5. The private branch exchange 1 also enables calls between multiple extension terminals (not shown) connected to the extension network 6, and provides additional services related to extension telephones.

[0013] The private branch exchange 1 includes a CPU 101, a ROM 102, a RAM 103, an auxiliary storage device 104, a power supply circuit 105, a power supply control circuit 106, a first control circuit 107, a second control circuit 108, a switching circuit 109, a relay circuit 110, a plurality of outside line connection circuits 111, and a plurality of extension line connection circuits 112. The CPU 101, the ROM 102, the RAM 103, the auxiliary storage device 104, the first control circuit 107, the second control circuit 108, and the switching circuit 109 are each connected to a bus 100.

[0014] Although not shown, all of the circuits in the private branch exchange 1 may be connected to each other so that they can communicate with each other, and for example, the power supply circuit 105, the power supply control circuit 106, the relay circuit 110, the plurality of outside line connection circuits 111, and the plurality of extension line connection circuits 112 may be connected to the bus 100. Furthermore, if the circuit portions denoted by reference numerals 101 to 109 are arranged on a single board, the wiring between the board and the relay circuit 110, the wiring between the board and the outside line connection circuit 111, and the wiring between the board and the extension line connection circuit 112 can be made into a single physical line.

[0015] The CPU 101 controls the entire private branch exchange 1. The ROM 102 and RAM 103 store programs and data for controlling the CPU 101. The auxiliary storage device 104 stores station data of the private branch exchange 1, communication log information of the private branch exchange 1, and the like. The power supply circuit 105 receives power from a commercial power source or a storage battery and outputs power (power supply voltage) to supply power to each circuit of the private branch exchange 1. A power supply control circuit 106 is connected to the power supply voltage output terminal of the power supply circuit 105. The power supply control circuit 106 is connected to the first control circuit 107, the second power supply circuit 108, and the switching circuit 109, and controls the distribution of power received from the power supply circuit 105 to each circuit in the private branch exchange 1 in cooperation with the first control circuit 107, the second power supply circuit 108, and the switching circuit 109. The switching circuit 109 specifies whether the first control circuit 107 or the second control circuit 108 should control each controlled circuit. The circuits to be controlled are a relay circuit 110, a plurality of outside line connection circuits 111, and a plurality of extension line connection circuits 112.

[0016] The first control circuit 107 controls the constant supply of power to the controlled circuits, and supplies power from the power supply control circuit 106 to the controlled circuits that require constant startup as instructed by the switching circuit 109. The second control circuit 108 controls the supply of power to the controlled circuits during a set time period, and supplies power from the power supply circuit 106 to the controlled circuits that are instructed by the switching circuit 109 according to the startup time of each controlled circuit.

[0017] The relay circuit 110 includes a switch circuit, is connected to the outside line connection circuit 111 and the extension line connection circuit 112, relays communications between the outside line connection circuit 111 and the extension line connection circuit 112, and provides communication services such as telephone connection control and additional services to the outside line terminal 2 and the extension line terminal 5. Each of the outside line connection circuits 111 is an interface for communicatively connecting the relay circuit 110 of the private branch exchange 1 to an outside line communication device such as the outside line terminal 2 via the outside line network 3. Each of the extension line connection circuits 112 is an interface for communicatively connecting the relay circuit 110 of the private branch exchange 1 to an extension line communication device such as the extension line terminal 5 via the extension line network 6.

[0018] In addition, the switching circuits of the switching circuit 109 and the relay circuit 110 are circuits that clearly require constant activation in order for the private branch exchange 1 to operate properly, and these circuits can be fixedly connected only to the first control circuit 107.

[0019] FIG. 2 shows specific operations performed by the above-mentioned circuits in the private branch exchange 1 as means, and also shows information used during control operations.

[0020] The private branch exchange 1 includes an equipment management means 1001, a power control means 1002, a power switching means 1003, a call control means 1004, an internal line circuit control means 1005, an external line circuit control means 1006, a service circuit control means 1007, a timer means 1008, a time acquisition means 1009, a circuit activation means 1010, a circuit stop means 1011, a control reception means 1012, a log recording means 1013, an activation frequency aggregation means 1014, a response time calculation means 1015, a circuit determination means 1016, and a switching instruction means 1017.

[0021] The device management means 1001 manages the entire private branch exchange 1. The power control means 1002 controls the power supply of the power control circuit 106, the first control circuit 107, and the second control circuit 108. The power switching means 1003 holds information on whether each power-controlled circuit is connected to the first control circuit 107 or the second control circuit 108 by the switching circuit 109, and instructs each power-controlled circuit to switch its connection to the first control circuit 107 or the second control circuit 108 in response to a request from the switching instruction means 1017. The timer means 1008 counts whether a timeout occurs for a circuit connected to the second control circuit 108 when a request for the power-controlled circuit is received from the outside. The time acquisition means 1009 acquires time information to determine a power supply schedule (second schedule) for starting or stopping each control-controlled circuit controlled by the second control circuit 108.

[0022] The circuit startup means 1010 starts the circuits to be controlled by the second control circuit 108 in response to a startup schedule or a startup request after a timeout is detected. The circuit shutdown means 1011 stops the circuits to be controlled by the second control circuit 108 in response to the expiration of the startup schedule or continuous startup time. The control acceptance means 1012 accepts requests to the controlled circuits on behalf of the private branch exchange 1 in case the controlled circuits of the second control circuit 108 are stopped. The log recording means 1013 acquires logs of the private branch exchange 1. For example, it is possible to record the startup and shutdown of the private branch exchange 1 itself, the startup and shutdown of each controlled circuit, or communication logs relayed by the private branch exchange 1.

[0023] The activation frequency counting means 1014 counts the activation frequency of each controlled circuit based on the activation information and operation stop information (operation timing information) recorded as a log by the log recording means 1013. The response time calculation means 1015 calculates the response time from the time a request for a service using the controlled circuit is received from outside the private branch exchange 1, etc., to the time the processing related to the service is completed, based on the recorded information (operation timing information) in the log. When the controlled circuit is connected to the second control circuit 108 and has stopped operating, the response time is the time taken for the controlled circuit to be activated and the time taken for the service provided by the controlled circuit to be processed. Therefore, when it is determined that this response time is longer than the service provided by other circuits, the response time is made easier to connect to the first control circuit 107.

[0024] The circuit determination means 1016 determines whether each controlled circuit should be connected to either the first control circuit 107 or the second control circuit 108, based on information from the activation frequency collection means 1014 and the response time calculation means 1015. The switching instruction means 1017 refers to the circuit determination means 1106, and if the connection destination immediately after the reference is different from the connection destination at the time of the previous reference, it instructs the power supply switching means 1003 to switch the connection destination of the relevant circuit between the first control circuit 107 and the second control circuit 108 as a switching instruction.

[0025] The private branch exchange 1 uses circuit activation information 1018, circuit deactivation information 1019, communication log information 1020, and determination threshold information 1021 in power supply control.

[0026] Circuit startup information 1018 is information relating to the circuit name and startup time when the circuit is started, etc., from the logs recorded by log recording means 1013. Circuit shutdown information 1019 is information relating to the circuit name and shutdown time when the circuit is stopped, etc., from the logs recorded by log recording means 1013. Communication log information 1020 is a communication log relayed by private branch exchange 1, from the logs recorded by log recording means 1013. Determination threshold information 1021 is threshold information when circuit determination means 1106 determines the destination circuit based on information from activation frequency counting means 1014 and response time calculation means 1015.

[0027] Next, an operation sequence relating to the start or stop of the control target circuit 113, which is power-supply controlled by the second control circuit 108 during normal operation of the private branch exchange 1, will be described with reference to FIG.

[0028] The CPU 101 requests a log from the auxiliary storage device 104 (step S001). In response to the request, the auxiliary storage device 104 reads the log and returns the read log to the CPU 101 (step S002). The returned log is the circuit activation information 1018 or the circuit deactivation information 1019, and corresponds to the power supply schedule (second schedule).

[0029] If the CPU 101 determines that the controlled circuit 113 needs to be started or stopped according to a schedule and that a state change related to the start or stop of operation is necessary from the log, the CPU 101 issues a start instruction or stop instruction to the controlled circuit 113 to the second control circuit 108 (step S003). The second control circuit 108 supplies or stops power to the controlled circuit 113 in response to the start instruction or stop instruction of step S003 (step S004). In response to the power supply or power stop, the controlled circuit 113 starts or stops operation and transmits the result to the second control circuit 108 (step S005). The second control circuit 108 transfers the result of the start or stop of the controlled circuit 113 in step S005 to the CPU 101 (step S006).

[0030] When the CPU 101 receives the result of the startup or shutdown of the controlled circuit 113, it records the result (operation timing information) of the startup or shutdown of the controlled circuit 113 performed from step S003 to step S006 as a log in the auxiliary storage device 104 (step S007).

[0031] Next, an operation sequence for starting up the control target circuit 113 when a control request to the control target circuit 113, which is power supply controlled by the second control circuit 108, times out will be described with reference to FIG.

[0032] For example, when the CPU 101 accesses the controlled circuit 113 in response to an external request, the CPU 101 detects a timeout of the controlled circuit 113 (step S101). The timeout means that a response time has elapsed since the controlled circuit 113 was started, and the controlled circuit 113 must be started in order to access the controlled circuit 113 in response to an external request.

[0033] When the CPU 101 detects a timeout of the controlled circuit 113, it issues a start-up instruction for the controlled circuit 113 to the second control circuit 108 (step S102). The second control circuit 108 supplies power to the controlled circuit 113 in response to the start-up instruction of step S102 (step S103). The controlled circuit 113 starts up by supplying power, and transmits the start-up result to the second control circuit 108 (step S104). The second control circuit 108 transfers the start-up result of the controlled circuit 113 in step S104 to the CPU 101 (step S105). The CPU 101 records the start-up result (operation timing information) of the controlled circuit 113 executed from step S103 to step S105 as a log in the auxiliary storage device 104 (step S106).

[0034] Here, there are two control target circuits 114 and 115 whose power supply is controlled by the first control circuit 107 or the second control circuit 108, and the operation sequence for determining whether the control target circuits 114 and 115 should be connected to the first control circuit 107 or the second control circuit 108 will be described with reference to Fig. 5. The control target circuits 114 and 115 are, for example, two outside line connection circuits out of the plurality of outside line connection circuits 111.

[0035] The CPU 101 inquires of the auxiliary storage device 104 about one of the startup frequency and response time of each of the control target circuits 114, 115 (step S201). In response to the inquiry of step S201, the auxiliary storage device 104 returns one of the startup frequency and response time of each of the control target circuits 114, 115 to the CPU 101 (step S202). Upon receiving the startup frequency or the response time, the CPU 101 determines whether each of the control target circuits 114, 115 should be connected to the first control circuit 107 or the second control circuit 108 (step S203).

[0036] Based on the determination result of step S203, the CPU 101 notifies the switching circuit 109 of control circuit connection information indicating whether each of the controlled target circuits 114, 115 is to be connected to the first control circuit 107 or the second control circuit 108 (step S204). The switching circuit 109 notifies each of the controlled target circuits 114, 115 of whether it is to be connected to the first control circuit 107 or the second control circuit 108 (step S205). Upon receiving the notification from the switching circuit 109, each of the controlled target circuits 114, 115 notifies the switching circuit 109 of the result of the response (step S206). The switching circuit 109 notifies the CPU 101 of the result notification received from each of the controlled target circuits 114, 115 (step S207).

[0037] Next, the control circuit setting operation of each controlled circuit executed by CPU 101 will be described with reference to the flowchart of Fig. 6. The control circuit of each controlled circuit is a first control circuit 107 or a second control circuit 108, which is switched by a switching circuit 109.

[0038] When CPU 101 starts operation in step S301, it first determines whether it is time to update the control circuit connected to each control target circuit by switching circuit 109 (step S302). The update time is, for example, the time when a predetermined period of time has elapsed since the previous update time of the connection destination. If it is not time to update the control circuit connected to each control target circuit, CPU 101 returns to execution of step S302.

[0039] When it is time to update the control circuit to which each controlled target circuit is connected, the CPU 101 acquires the log (operation timing information) registered in the auxiliary storage device 104 and calculates the startup frequency and response time of each controlled target circuit using the startup frequency counting means 1014 and the response time calculating means 1015 (step S303). The startup frequency and response time are startup frequency parameters. After calculating the startup frequency or response time in step S303, the CPU 101 determines whether the control circuits to which all controlled target circuits are connected have been determined (step S304). In step S304, it is determined whether the control circuit to which all controlled target circuits are switched has been determined to be either the first control circuit 107 or the second control circuit 108.

[0040] If the control circuits to which all of the controlled circuits are connected have not yet been determined, the CPU 101 selects a controlled circuit whose connection control circuit has not yet been determined (step S305) and determines whether the activation frequency or response time of the selected controlled circuit is equal to or greater than the switching threshold (step S306). Step S306 corresponds to the circuit determination means 1016. If the activation frequency or response time of the selected controlled circuit is equal to or greater than the switching threshold, the CPU 101 sets the control circuit to which the selected controlled circuit (first controlled circuit) is to be switched to the first control circuit 107 (step S307). On the other hand, if the activation frequency or response time of the selected controlled circuit is less than the switching threshold, the CPU 101 sets the control circuit to which the selected controlled circuit (second controlled circuit) is to be switched to the second control circuit 108 (step S308). After executing step S307 or S308, the CPU 101 proceeds to the determination of step S304.

[0041] If CPU 101 determines in step S304 that the control circuits to which all controlled circuits are to be switched have been determined, it instructs switching circuit 109 to select the control circuit for each controlled circuit (step S309). By executing step S309, switching circuit 109 switches the control circuit for each controlled circuit to first control circuit 107 or second control circuit 108 as instructed. The setting operation for the control circuit for each controlled circuit ends in step S310.

[0042] 6, the first control circuit 107 continuously supplies power to the control target circuits, namely, the relay circuit 110, the plurality of outside line connection circuits 111, and the plurality of extension line connection circuits 112, whose startup frequency or response time is equal to or greater than the switching threshold, in accordance with the power supply schedule of the first schedule indicating continuous power supply. On the other hand, the second control circuit 108 continuously supplies power to the control target circuits, namely, the relay circuit 110, the plurality of outside line connection circuits 111, and the plurality of extension line connection circuits 112, whose startup frequency or response time is less than the switching threshold, in accordance with the power supply schedule of the second schedule indicating power supply during a time period determined by the log.

[0043] According to the embodiment, a power supply schedule is set for circuits operating within the private branch exchange 1 based on the response time including the startup frequency and the time it takes to supply power to the circuits, so that frequently used controlled circuits or controlled circuits that require time to restart after being stopped are set as controlled circuits to be constantly powered and connected to the first control circuit, while less frequently used circuits are set as controlled circuits to be started only when necessary or to be stopped on a scheduled basis and connected to the second control circuit. This makes it possible to stop unnecessary power supply to less frequently used circuits, thereby reducing power consumption in the private branch exchange.

[0044] In the above-described embodiment, the first control circuit 107 for continuous power supply and the second control circuit 108 for time-dependent power supply are provided, but a single control circuit may perform both continuous power supply and time-dependent power supply according to a power supply schedule. [Explanation of symbols]

[0045] 1 Private branch exchange 100 Bus 101 CPU 102 ROM 103 RAM 104 Auxiliary storage 105 Power supply circuit 106 Power supply control circuit 107 First control circuit 108 2nd power supply circuit 109 Switching circuit 110 Relay circuit 111 External line connection circuit 112 Internal connection circuit

Claims

1. an extension control circuit for controlling an extension terminal; an outside line control circuit for controlling an outside line terminal; a relay circuit connected to the extension control circuit and the outside line control circuit, relaying communication between the extension control circuit and the outside line control circuit to provide communication services including telephone calls to the extension terminals and the outside line terminals; a power supply unit that generates power to be supplied to the extension control circuit, the outside line control circuit, and the relay circuit; a setting unit that sets a power supply schedule for each of the extension control circuit, the outside line control circuit, and the relay circuit; a power supply control unit that supplies the power generated by the power supply unit to each of the extension control circuit, the outside line control circuit, and the trunk circuit in accordance with the power supply schedule, the setting unit detects operation timing information including activation information and operation stop information for each of the extension line control circuit, the outside line control circuit, and the relay circuit, and records the operation timing information as a log; a calculation means for calculating an operation frequency parameter that increases as the operation frequency increases for each of the extension control circuit, the outside line control circuit, and the relay circuit within the immediately preceding predetermined period based on the operation timing information; and determining means for determining the power supply schedule based on the magnitude of the operation frequency parameter for each of the extension control circuit, the outside line control circuit, and the trunk circuit.

2. The determining means a determining means for determining whether or not the magnitude of the operation frequency parameter for each of the extension control circuit, the outside line control circuit, and the relay circuit is equal to or greater than a threshold value; 2. The private branch exchange according to claim 1, further comprising: means for setting the power supply schedule for a first controlled circuit, which is a circuit among the extension control circuit, the outside line control circuit, and the relay circuit, whose magnitude of the operation frequency parameter is equal to or greater than the threshold, as a first schedule indicating continuous power supply; and means for setting the power supply schedule for a second controlled circuit, which is a circuit among the extension control circuit, the outside line control circuit, and the relay circuit, whose magnitude of the operation frequency parameter is smaller than the threshold, as a second schedule indicating power supply during a set time period.

3. The power supply control unit a first control circuit that performs the continuous power supply according to the first schedule; a second control circuit that supplies power during the set time period according to the second schedule; 3. The private branch exchange according to claim 2, further comprising: a switching circuit that connects the first controlled circuit to the first control circuit in order to supply power to the first controlled circuit at all times, and that connects the second controlled circuit to the second control circuit in order to supply power to the second controlled circuit during the set time period.

4. 3. The private branch exchange according to claim 1, wherein the operation frequency parameter is a startup frequency or a response time, and the response time is a time including a startup time and a processing time for the communication service.

5. 3. The private branch exchange according to claim 2, wherein said second schedule is based on said operation timing information for said second control target circuit recorded in said log.

6. an extension control circuit for controlling an extension terminal; an outside line control circuit for controlling an outside line terminal; a relay circuit connected to the extension control circuit and the outside line control circuit, relaying communication between the extension control circuit and the outside line control circuit to provide communication services including telephone calls to the extension terminals and the outside line terminals; a power supply unit that generates power to be supplied to the extension control circuit, the outside line control circuit, and the trunk circuit, detecting operation timing information including activation information and operation stop information for each of the extension control circuit, the outside line control circuit, and the relay circuit, and recording the operation timing information as a log; a step of calculating an operation frequency parameter that increases as the operation frequency increases for each of the extension control circuit, the outside line control circuit, and the relay circuit within the immediately preceding predetermined period based on the operation timing information; determining a power supply schedule for each of the extension control circuit, the outside line control circuit, and the relay circuit based on the magnitude of the operation frequency parameter; and supplying the power generated by the power supply unit to each of the extension control circuit, the outside line control circuit, and the relay circuit in accordance with the power supply schedule.

7. an extension control circuit for controlling an extension terminal; an outside line control circuit for controlling an outside line terminal; a relay circuit connected to the extension control circuit and the outside line control circuit, relaying communication between the extension control circuit and the outside line control circuit to provide communication services including telephone calls to the extension terminals and the outside line terminals; a power supply unit that generates power to be supplied to the extension control circuit, the outside line control circuit, and the relay circuit, On the computer, detecting operation timing information including activation information and operation stop information for each of the extension control circuit, the outside line control circuit, and the relay circuit, and recording the operation timing information as a log; a step of calculating an operation frequency parameter that increases as the operation frequency increases for each of the extension control circuit, the outside line control circuit, and the relay circuit within the immediately preceding predetermined period based on the operation timing information; determining a power supply schedule for each of the extension control circuit, the outside line control circuit, and the relay circuit based on the magnitude of the operation frequency parameter; and supplying the power generated by the power supply unit to each of the extension control circuit, the outside line control circuit, and the relay circuit in accordance with the power supply schedule.

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