JP4473646B2 - ISDN control unit - Google Patents

Description

  The present invention relates to an ISDN control unit that is connected to an ISDN network and enables power saving during standby, and a multifunction device including the ISDN control unit.

Conventionally, a Layer 1 monitoring unit is provided, and power is supplied to the ISDN network control unit and the terminal main function unit independently. When the Layer 1 monitoring unit detects an incoming call, it starts supplying power to the ISDN network control unit and responds to the incoming call. There has been proposed a communication terminal device that can operate with low power consumption by stopping power supply to the terminal main function unit during standby by starting power supply to the terminal main function unit when possible (for example, , See Patent Document 1).
JP 2001-333208 A

  However, in the conventional communication terminal apparatus, when the G4 facsimile function is added as an optional function, the power saving method cannot be applied and the power saving cannot be achieved. There is.

  Further, in the conventional communication terminal device, when the Layer1 monitoring unit detects an incoming call, power supply to the ISDN network control unit is started. Since power supply to the ISDN network control unit is started irrespective of the ISDN activation mode (call-by-call activation and constant activation), there is a problem that further power saving cannot be achieved.

  In particular, in ISDN, a plurality of communication terminal devices can be connected to a single communication line. However, when power supply to the ISDN network control unit is started in response to detection of an incoming call in the Layer 1 monitoring unit, power supply is performed. There arises a situation in which power is supplied to the ISDN network control unit of the communication terminal device that does not need to be connected. For this reason, there exists a problem that power saving cannot be achieved efficiently.

  The present invention has been made in view of the above problems, and provides an ISDN control unit capable of efficiently saving power according to an ISDN activation mode and a multifunction machine including the ISDN control unit. Objective.

The present invention is an ISDN control unit for controlling a facsimile function executed in the main body of a multi- function device, and includes interface means for connecting to an ISDN network and activation defined by Layer 1 obtained through the interface means. Identification means for identifying the ISDN activation mode according to the type of the control unit, and control means for shifting to the energy saving mode for reducing the power consumption of the unit according to the activation mode, the control means comprising the device When receiving an instruction to shift to the energy saving mode from the main unit and the identification means identifies that the ISDN activation mode is always activated, the power to reduce the power consumption by putting certain components of this unit in a stopped state It is shifted to the down mode, when the ISDN startup mode is identified as activated each call by the identification means, of the specific The bus connection switch said particular component is connected with the formed elements in the operation stop state is turned off to stop the power supply of the to a particular component, the more power consumption than the power-down mode The mode is shifted to the standby mode to be reduced.

  In addition, the present invention shifts to a power-down mode in which a specific component is stopped when the ISDN activation mode is always activated to reduce the power consumption of the unit, while the ISDN activation mode is activated for each call. In the case of the ISDN control unit that stops the power supply to a specific component and shifts to the standby mode that reduces the power consumption of the unit as compared with the power down mode, via the interface for connecting to the ISDN network The ISDN activation mode is identified according to the activation type defined in the obtained Layer 1, and when the activation mode is always activated, a specific component is returned from the operation stop state to cancel the power down mode. Is.

  According to the ISDN control unit according to the present invention and the multi-function machine including the ISDN control unit, it is possible to efficiently save power according to the activation mode of ISDN.

An ISDN control unit according to a first aspect of the present invention is an ISDN control unit that controls a facsimile function executed in a main body of a multi- function device, and includes an interface unit for connecting to an ISDN network, and the interface unit. Identification means for identifying the activation mode of ISDN according to the type of activation defined in Layer 1 obtained via the control, and control means for shifting to the energy saving mode for reducing the power consumption of this unit according to the activation mode, And the control means operates a specific component of this unit when the identification means identifies that the activation mode of ISDN is always activated when receiving an instruction to shift to the energy saving mode from the apparatus main body. The system is shifted to a power down mode for reducing power consumption by putting it in a stopped state. If the start and is identified, stop power supply of the to a particular component of the bus connection switch that certain components are connected together to the specific component stops operation in the OFF state Then, a configuration is adopted in which a transition is made to a standby mode that further reduces power consumption compared to the power down mode.

According to this configuration, the ISDN activation mode is identified according to the activation type defined in Layer 1 obtained through the interface means, and the power down mode or the standby mode can be shifted according to the activation mode. become. Therefore, depending on the activation mode of ISDN, a specific component can be stopped or a specific component can be stopped and power supply from the bus to the specific component can be stopped . It is possible to efficiently save power according to the activation mode of ISDN.

According to a second aspect of the present invention, in the ISDN control unit according to the first aspect, when the control means detects a call addressed to itself from call setting information obtained via the interface means , the connection A configuration is adopted in which the switch is turned on to restart the power supply to the specific component to cancel the standby mode.

According to this configuration, when a call addressed to the local station is detected from the call setting information obtained through the interface means, the standby mode is set by turning on the connection switch and restarting the power supply to a specific component. Canceled. Therefore, since power supply from a bus to a specific component can be operated according to the contents of call setting information, power can be efficiently saved according to the contents of call setting information together with the ISDN activation mode. Can be planned.

  On the other hand, when a call other than the call addressed to the own station is detected, the standby mode is not canceled and is maintained as it is. Therefore, for example, when a plurality of terminals are connected to a communication line, when a call other than a call addressed to the local station is detected, the standby mode is canceled and a situation where power is supplied is avoided. In addition, power saving can be achieved.

According to a third aspect of the present invention, in the ISDN control unit according to the first aspect, the control means has a specific configuration when a call addressed to itself is detected from call setting information obtained via the interface means. A configuration is adopted in which the element is returned from the operation stop state to cancel the power down mode.

  According to this configuration, when a call addressed to the local station is detected from the call setting information obtained via the interface unit, the specific component is returned from the operation stop state and the power down mode is canceled. Therefore, the operation stop state of a specific component can be operated according to the contents of the call setting information. As a result, since power supply to a specific component can be operated, it is possible to efficiently save power according to the contents of call setting information together with the ISDN activation mode.

  On the other hand, when a call other than the call addressed to the own station is detected, the power down mode is not canceled and is maintained as it is. Therefore, for example, when a plurality of terminals are connected to the communication line, when a call other than a call addressed to the local station is detected, the power-dan mode is canceled and a situation where power is supplied is avoided. Thus, power saving can be achieved.

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

  FIG. 1 is a block diagram showing a configuration around an ISDN control unit (ISDN control unit) in a multifunction machine according to an embodiment of the present invention.

  The MFP according to the present embodiment has a digital line facsimile function (hereinafter referred to as “G4 facsimile function”) conforming to the G4 standard based on the ITU-T recommendation and conforms to the G3 standard based on the recommendation. It has a facsimile function for analog telephone lines (hereinafter referred to as “G3 facsimile function”). The ISDN control unit 101 shown in FIG. 1 mainly controls processing when the former G4 facsimile function is executed, and the line terminal main function unit 102 mainly performs processing when the latter G3 facsimile function is executed. Take control.

  The ISDN control unit 101 is connected to the ISDN network and controls communication via the ISDN network. In particular, communication control is performed according to a protocol for executing the G4 facsimile function. In addition to a modulation / demodulation function for the G3 facsimile function, it also has a coding and decoding function for image data. Further, the ISDN control unit 101 also controls processing when executing a G3I facsimile function that realizes a facsimile function equivalent to the G3 facsimile function using the ISDN network.

  The line terminal main function unit 102 is connected to the PSTN network and controls communication via the PSTN network. In particular, communication control is performed according to a protocol for executing the G3 facsimile function. In addition to a modulation / demodulation function for the G3 facsimile function, it also has a coding and decoding function for image data. Further, the line terminal main function unit 102 also performs processing such as image data compression and resolution conversion when printing image data related to the facsimile function of the multifunction peripheral.

  The ISDN control unit 101 and the line terminal main function unit 102 are connected to the MFP main body 103. FIG. 1 shows a case where the ISDN control unit 101 is connected to the multifunction machine main body 103 via the expansion board 104. The MFP main body 103 includes a power supply unit 105. The ISDN control unit 101 and the line terminal main function unit 102 operate by receiving power supply from the power supply unit 105.

  The power supply unit 105 includes a constant power supply 106 and a main power switch (SW) 107. The constant power supply 106 always supplies the power (3.3 V) required when the ISDN control unit 101 and the line terminal main function unit 102 operate. The main power SW 107 is a switch for switching supply of power (5V, 24V) other than the above-described 3.3V in accordance with a wakeup signal to be described later. In the line terminal main function unit 102, for example, a 5V power supply is required when outputting monitor sound.

  The ISDN control unit 101 and the line terminal main function unit 102 have a function of reducing power consumption (hereinafter referred to as “energy saving function”) by putting the components into an operation stop state. In particular, the ISDN control unit 101 has two energy saving modes of a power down mode and a standby mode in the energy saving function. Details of the energy saving function of the ISDN control unit 101 will be described later.

The power down mode is to reduce power consumption of the specific component by setting a specific component of the ISDN control unit 101 to an operation stop state (power down state). On the other hand, in the standby mode , the power supply from the bus (address bus and data bus) to specific components is stopped by turning off the bus switch of the ISDN control unit 101 to be described later. This also reduces power consumption.

  In the ISDN control unit 101 shown in FIG. 1, a portion where power supply is stopped in the standby mode is displayed by shading. Further, in the line terminal main function unit 102, the portion in which the operation is stopped is indicated by shading.

  As shown in the figure, the ISDN control unit 101 always supplies power to the CPU 108 that controls the entire ISDN control unit 101 and the S / T controller 109 that controls data on the S / T bus. Has been done. On the other hand, the power supply to other ICs 110 including a modem device and an image CODEC described later is stopped under certain conditions. The S / T bus connector is composed of a modular connector such as RJ-45.

  On the other hand, in the line terminal main function unit 102, power supply is stopped under certain conditions to the main CPU 111 that controls the entire line terminal main function unit 102. On the other hand, power is constantly supplied to the energy saving microcomputer 112 that gives an instruction to a power switch (SW) to be described later according to an interrupt signal from the CPU 108 of the ISDN control unit 101. The power SW 113 switches power supply to the other IC 110 and the main CPU 111 under the instruction of the energy saving microcomputer 112.

  The restart of power supply to the other IC 110 of the ISDN control unit 101 is performed, for example, when there is an incoming call from the ISDN network. When there is an incoming call from the ISDN network, an interrupt signal is output from the CPU 108 to the energy saving microcomputer 112. The energy saving microcomputer 112 instructs the power supply SW 113 to resume power supply to the other ICs 110 in response to the interrupt signal. The power supply SW 113 resumes power supply to the other ICs 110 in response to this instruction.

  On the other hand, resumption of power supply to the main CPU 111 is performed, for example, when there is an incoming call from the PSTN network. When there is an incoming call from the PSTN network, an interrupt signal is output to the energy saving microcomputer 112 via the network control unit. The energy saving microcomputer 112 instructs the power SW 113 to resume power supply to the main CPU 111 in response to the interrupt signal. In response to this instruction, the power SW 113 resumes power supply to the main CPU 111.

  When power supply is resumed, the main CPU 111 outputs a wake-up signal to the multi-function device main body 103. When this wake-up signal is detected in the USB interface (I / F) of the MFP main body 103, the main power SW 107 is switched on. When the main power SW 107 is switched to the on state, the system is started by the system control unit 114, and other power supply (5 V, 24 V) is performed to the line terminal main function unit 102.

  In this multifunction machine, the signal on the USB bus is used as a unique wake-up signal. Specifically, the signal is regarded as a unique wake-up signal using D + which is a signal on the USB bus.

  FIG. 2 is a diagram for explaining the state of D + regarded as such a wake-up signal.

  As shown in the figure, in this multi-function peripheral, when other power is not supplied to the line terminal main function unit 102 (sleep state), D + is set to the low level and the sleep state is canceled. High level (when other power is supplied). That is, in the present multifunction machine, the switching to the high level in D + is regarded as a wake-up signal. In other words, it is considered that the wakeup signal is output to the power supply unit 105 by pulling up D +.

  Further, the multifunction peripheral according to the present embodiment corresponds to an ISDN telephone. The ISDN telephone is a function for making a call using a handset 115 connected to a modular connector on the expansion board 104 based on voice output from a voice CODEC described later (see FIG. 1).

  Next, an energy saving function in ISDN control unit 101 according to the present embodiment will be described. The mode to be transferred to the energy saving function in the ISDN control unit 101 changes according to the type of activation defined in Layer 1 (hereinafter referred to as “Layer 1 activation type”). That is, the mode to be moved changes depending on whether the Layer 1 activation type is always activated or activated for each call. Note that the transition to the energy saving mode in the ISDN control unit 101 is performed in accordance with a transition instruction from the multifunction machine main body 103.

  The ISDN control unit 101 shifts to the power down mode when the Layer1 activation type is always activated, and shifts to the standby mode when the Layer1 activation type is activated for each call.

  3 and 4 are block diagrams showing the configuration of the ISDN control unit 101 according to the present embodiment. Note that FIG. 3 shows a state in which the Layer 1 activation type is always activated and the mode is shifted to the power-down mode. FIG. 4 shows a state in which the Layer1 activation type is call-by-call activation and has shifted to the standby mode. 3 and 4, the same components as those in FIG. 1 are denoted by the same reference numerals.

  As shown in FIGS. 3 and 4, the ISDN control unit 101 includes the CPU 108 described above, and a FROM 301 and an SRAM 302 are connected to the CPU 108 via a bus. The FROM 301 functions as a program ROM that stores a program read and executed by the CPU 108. The SRAM 302 functions as a work memory for the CPU 108.

  The S / T controller 109 and the G4 fax control unit 303 are connected to the CPU 108 via a bus. The S / T controller 109 controls the S / T bus driver and the D channel, and mainly performs call control. The G4 fax control unit 303 executes communication control necessary for executing the G4 facsimile function. The G4 fax control unit 303 includes an HDLC controller 304. The HDLC controller 304 performs data communication control according to the HDLC control procedure.

  An HDLC controller 304 and an audio CODEC 305 are connected to the S / T controller 109 via a unique serial bus. The audio CODEC 305 performs processing for converting digital data received via the S / T controller 109 into audio data. The converted voice data is input to the G3I fax control unit 306.

  Further, when the ISDN telephone function in this multifunction machine is used, the voice CODEC 305 outputs voice data converted from digital data to the handset 115. On the other hand, the audio data input from the handset 115 is converted into digital data. The converted digital data is output to the ISDN network via the S / T controller 109.

  The G3I fax control unit 306 executes communication control necessary for executing the G3I facsimile function. The G3I fax control unit 306 includes an AFE 307 and a modem 308. Audio data input from the audio CODEC 305 is converted into digital data via the AFE 307 and input to the modem 308. The modem 308 performs modulation / demodulation processing on the input audio data. The modem 308 is connected to the CPU 108 via a bus.

  Further, two images CODECs 309 and 310 are connected to the CPU 108 via a bus. The image CODECs 309 and 310 perform image data coding and decoding processing. The two images CODECs 309 and 310 are prepared in order to enable facsimile communication using the G3I facsimile function and the G4 facsimile function simultaneously.

  A main memory 311 is connected to the image CODEC 309. The main memory 311 functions as a work memory for the CPU 108 together with the SRAM 302 when the bus is not separated by a bus switch described later. When the bus is separated by the bus switch, only the SRAM 302 functions as a work memory for the CPU 108.

  The ISDN control unit 101 includes a bus switch 312 on the bus. As shown in FIG. 3, the bus switch 312 is provided at a position where the CPU 108 is connected to the modem 308 and the image CODECs 309 and 310. The bus switch 312 isolates the bus, thereby preventing current from flowing from the bus to the component (IC) that is in the power-off state in the standby mode. In the following, the case where the bus is separated by the bus switch 312 will be referred to as “bus switch OFF”, and the case where the bus is not separated by the bus switch 312 will be referred to as “bus switch ON”. Shall.

  As described above, when the Layer 1 activation type is always activated, the ISDN control unit 101 shifts to the power down mode under the instruction of the multi-function peripheral 103. The timing of shifting to the power-down mode is not particularly limited. For example, when there is no instruction or request from the ISDN control unit 101 or the like in the MFP main body 103 for a predetermined time, or when there is no transmission such as FAX transmission. In addition, it is conceivable that an instruction to shift to the power-down mode is output from the MFP main body 103 to the ISDN controller 101.

  In the power down mode, the bus is set in a non-separated state by the bus switch 312. In this state, a specific component is put into an operation stop state (power down state). Specifically, the HDLC controller 304, the G3I fax control unit 306, and the image CODEC 310 are set in a power-down state. Note that when the HDLC controller 304 is in a power-down state, the audio CODEC 305 connected thereto is also in a power-down state.

  When these components are put into a power-down state, the CPU 108 outputs an operation stop signal or stops the operation by a software command. FIG. 3 shows a case in which an operation stop signal is output to the AFE 307, the modem 308, and the image CODEC 310 of the G3I fax control unit 306, and the G4 fax control unit 303 is set in a power down state by a software command.

  Further, when returning these components from the power-down state, the CPU 108 outputs a release signal for releasing the power-down state or cancels the operation stop by a software command. In FIG. 3, the release signal is output to the AFE 307, the modem 308 and the image CODEC 310 of the G3I fax control unit 306, and the power down state is canceled by a software command to the HDLC controller 304 as in the case of the power down state. Shows when to do.

  On the other hand, when the Layer 1 activation type is activation for each call, the ISDN control unit 101 shifts to the standby mode under the instruction of the multi-function peripheral 103. The timing of transition to the standby mode is not particularly limited, but, for example, when there is no instruction or request from the ISDN control unit 101 or the like in the multi-function device body 103 for a predetermined time, for example, as in the transition to the power down mode. When there is no transmission such as transmission or FAX transmission, it is conceivable to output an instruction to shift to the power down mode from the multi-function device main body 103 to the ISDN control unit 101.

As described above, in the standby mode , the power supply to a specific component is also stopped by turning off the bus switch 312. In the present embodiment, the power supply to a specific component is stopped by turning off the bus switch 312 after putting other components in the power-down state.

  Note that when the CPU 108 stops the power supply from the main body, the multifunction machine main body 103 shifts the S / T controller 109 to the low power mode. Similarly, the MFP main body 103 shifts to the low power mode in which the power consumption of the CPU 108, the FROM 301, and the SRAM 302 is reduced.

  In the standby mode, after the HDLC controller 304 (audio CODEC 305) is set in the power down state, the bus is switched to the separated state by the bus switch 312. Then, the CPU 108, the S / T controller 109, the FROM 301, and the SRAM 302 shift to the low power mode.

  To return from the standby mode, after the CPU 108, the S / T controller 109, the FROM 301, and the SRAM 302 return from the low power mode, the power supply to specific components is resumed, and the bus switch 312 makes the bus non-separated. Switch. Thereafter, the HDLC controller 304 or the like is returned from the power-down state.

  Next, the operation when the ISDN control unit 101 according to the present embodiment returns from the standby mode and the power down mode will be described.

  5 and 6 are flowcharts for explaining the operation when ISDN control section 101 according to the present embodiment returns from the standby mode and the power-down mode, respectively.

  5 and 6, the operation flow of the ISDN control unit 101 is shown on the left, the operation flow of the line terminal main function unit 102 is shown in the center, and the operation flow of the MFP main body 103 is shown on the right. Yes.

  As a premise for starting the operation of FIG. 5, it is assumed that the ISDN control unit 101 has already shifted to the standby mode in accordance with the Layer 1 activation type under the instruction of the MFP main body 103. If the standby mode has been shifted, it is assumed that the CPU 108 of the ISDN control unit 101 has also shifted to the low power mode. In the line terminal main function unit 102, the main CPU 111 is assumed to be in an operation stop state. Further, in the MFP main body 103, it is assumed that the main power SW 107 of the power unit 105 is turned off.

  On the other hand, as a premise for starting the operation of FIG. 6, it is assumed that the ISDN control unit 101 has already shifted to the power-down mode according to the Layer 1 activation type under the instruction of the multi-function peripheral body 103. In the line terminal main function unit 102, the main CPU 111 is assumed to be in an operation stop state. Further, in the MFP main body 103, it is assumed that the main power SW 107 of the power unit 105 is turned off.

  When returning from the standby mode, as shown in FIG. 5, first, reception of INFO is monitored (ST501). The determination of ST501 is repeated until INFO is received. The INFO reception is monitored by the S / T controller 109.

  When the reception of INFO is confirmed, an interrupt signal is output from the S / T controller 109 to the CPU 108 (ST502). In response to this interrupt signal, CPU 108, FROM 301 and SRAM 302 return from the low power mode (ST503).

  Next, reception of the SETUP message is monitored (ST504). The determination of ST504 is repeated until SETUP is received. When reception of the SETUP is confirmed, the content of the SETUP is analyzed (ST505). The determination of SETUP reception and the content analysis of the SETUP are performed by the CPU 108.

  Then, it is determined whether the call is to the own station according to the contents of SETUP (ST506). If it is determined that the call is not to the local station, the S / T controller 109, the CPU 108, the FROM 301, and the SRAM 302 shift to the low power mode under the instruction of the multi-function device body 103 (ST507). Then, the process returns to ST501, and reception of INFO is monitored again.

  On the other hand, if it is determined that the call is to the local station, an interrupt signal is output from the CPU 108 to the energy saving microcomputer 112 of the line terminal main function unit 102. When the interrupt signal is received, the energy saving microcomputer 112 issues an instruction to switch the power supply SW 113 to the on state. In response to this instruction, power SW 113 is turned on (ST508).

  In the standby mode, when the power supply SW 113 is turned on, the bus switch 312 of the ISDN control unit 101 switches the bus from the separated state to the non-separated state (the power switch is turned on and the bus switch is turned on) (ST509). As a result, the power supply from the power source 106 is resumed to the image CODEC 309 and the modem 308 arranged below the bus switch 312 shown in FIG.

  On the other hand, when the power supply SW 113 is turned on, the power supply from the power supply 106 to the main CPU 111 of the line terminal main function unit 102 is resumed. When the power supply is received, the main CPU 111 outputs a wake-up signal to the MFP main body 103 (ST510). Then, the main CPU 111 makes an incoming call permission request (incoming request) for the call to the local station to the multi-function device main body 103 (ST511).

  On the MFP main body 103 side, when the wake-up signal output from the main CPU 111 is detected by the USB I / F, the main power SW 107 of the power unit 105 is switched to the on state (ST512). When main power SW 107 is turned on, system is started by system controller 114 (ST513). When the above incoming request is accepted with the system activated, an incoming call permission response (incoming response) is made from the multi-function device main body 103 in response to the incoming request (ST514).

  This incoming response is output to the CPU 108 of the ISDN control unit 101 via the main CPU 111 of the line terminal main function unit 102. Note that a bus connecting the CPU 108 and the main CPU 111 is used for communication such as an incoming call response (see FIG. 1). Upon receipt of the incoming call response, CPU 108 returns HDLC controller 304 and audio CODEC 305 from the power-down state (ST515). This cancels the standby mode.

  After returning the HDLC controller 304 and the audio CODEC 305 from the power-down state, the CPU 108 performs an incoming call process for the call to the local station (ST516). After completing the incoming call processing, the image data is received via the ISDN network (ST517). Thereafter, when reception of the image data is completed, CPU 108 performs a disconnection process for the call to the local station (ST518).

  When the disconnection process is performed by the CPU 108, no instruction or request is output from the ISDN control unit 101 to the MFP main body 103. If multifunction device main body 103 does not receive an instruction or request from ISDN control section 101 for a certain period of time, an instruction to shift to an energy saving mode is output from multifunction apparatus main body 103 to ISDN control section 101 (ST519).

  When this energy saving mode transition instruction is accepted, the ISDN control unit 101 performs a Layer1 activation type determination process (ST520). FIG. 7 is a diagram for explaining the Layer 1 activation type determination process. As shown in the figure, in the Layer 1 activation type determination process, it is determined whether the Layer 1 activation type is always activated (ST701). Note that when the flow shown in FIG. 5 is processed, since it is a case of shifting to the standby mode, it is determined that each call is activated.

  If it is determined that the Layer 1 activation type is activation for each call, the CPU 108 puts the HDLC controller 304 and the audio CODEC 305 into a power-down state (ST521). Thereafter, an energy saving mode transition response for notifying the MFP main body 103 of the energy saving mode transition is output (ST522).

  In MFP main body 103, upon receiving an energy saving mode transition response, main power supply SW 107 is switched to the off state (ST523). When the main power SW 107 is switched to the off state, the power source SW 113 is automatically switched to the off state. In the standby mode, when the power supply SW 113 is turned off, the bus switch 312 of the ISDN control unit 101 makes the bus separated (bus switch OFF) accordingly (ST524).

  At the same time that the bus is separated by the bus switch 312, the power supply to the main CPU 111 is stopped (ST525). As a result, the main CPU 111 enters an operation stop state. When the main CPU 111 shifts to the operation stop state, in the ISDN control unit 101, the S / T controller 109, the CPU 108, the FROM 301, and the SRAM 302 shift to the low power mode (ST507). Then, the process returns to ST501, and reception of INFO is monitored again.

Thus, according to the ISDN control unit 101 of the present embodiment, the ISDN activation mode is identified according to the Layer 1 activation type obtained via the S / T controller 109, and the activation mode is activated for each call. The standby mode is canceled by turning on the connection switch to resume the power supply to the specific component . Therefore, since power supply to a specific component can be operated in accordance with the ISDN activation mode, it is possible to efficiently save power according to the ISDN activation mode.

Further, in the ISDN control unit 101 of the present embodiment, when a call addressed to the own station is detected from the call setting information obtained via the S / T controller 109, the connection switch is turned on and a specific component is set. The standby mode is canceled by restarting the power supply. Accordingly, since power supply to a specific component can be operated according to the contents of the call setting information, it is possible to efficiently save power for the peripheral circuits according to the contents of the call setting information together with the ISDN activation mode. Can be achieved.

  On the other hand, when a call other than the call addressed to the own station is detected, the standby mode is not canceled and is maintained as it is. Therefore, for example, when a plurality of terminals are connected to a communication line, when a call other than a call addressed to the local station is detected, the standby mode is canceled and a situation where power is supplied is avoided. In addition, power saving can be achieved.

Further, in the ISDN control unit 101 of the present embodiment, other components other than the specific components that stop power supply in the standby mode are set in the operation stop state, and when the standby mode is canceled, the operation stop state is set. Return the other components from the operation stop state. Therefore, in the standby mode, other components other than the specific components are in an operation stop state, so that it is possible to further save power in the ISDN control unit.

  On the other hand, when returning from the power down mode, as shown in FIG. 6, first, reception of SETUP is monitored (ST601). The determination in ST601 is repeated until SETUP is received. When reception of the SETUP is confirmed, the content of the SETUP is analyzed (ST602). Note that the CPU 108 monitors SETUP reception and analyzes the contents of the SETUP.

  Then, it is determined whether the call is to the own station according to the content of the SETUP message (ST603). If it is determined that the call is not to the own station, the process returns to ST601 and the reception of the SETUP is monitored again.

  On the other hand, if it is determined that the call is to the local station, an interrupt signal is output from the CPU 108 to the energy saving microcomputer 112 of the line terminal main function unit 102. When the interrupt signal is received, the energy saving microcomputer 112 issues an instruction to switch the power supply SW 113 to the on state. In response to this instruction, the power supply SW 113 is turned on (ST604).

  In the power down mode, the bus is maintained in the non-separated state by the bus switch 312 of the ISDN control unit 101. Therefore, as in the standby mode described with reference to FIG. The bus switch 312 does not switch the bus to the non-separated state.

  When the power SW 113 is turned on, the power from the power source 106 is always supplied to the main CPU 111 of the line terminal main function unit 102. When the power supply is received, the main CPU 111 outputs a wake-up signal to the MFP main body 103 (ST605). Then, the main CPU 111 makes an incoming call permission request (incoming call request) for a call to the local station to the multi-function device main body 103 (ST606).

  On the MFP main body 103 side, when the wake-up signal output from the main CPU 111 is detected by the USB I / F, the main power SW 107 of the power supply unit 105 is switched to the on state (ST607). When main power SW 107 is switched on, system is started by system controller 114 (ST608). When the above incoming request is accepted with the system activated, an incoming call permission response (incoming response) is made from the MFP main body 103 in response to the incoming request (ST609).

  This incoming response is output to the CPU 108 of the ISDN control unit 101 via the main CPU 111 of the line terminal main function unit 102. Upon receiving the incoming call response, CPU 108 causes other ICs such as HDLC controller 304 and voice CODEC 305 to return from the power-down state (ST610). Thereby, the power down mode is canceled.

  After restoring other ICs such as the HDLC controller 304 and the audio CODEC 305 from the power-down state, the CPU 108 performs an incoming call process for the call to the local station (ST611). After completing the incoming call processing, image data is received via the ISDN network (ST612). Thereafter, when the reception of the image data is completed, CPU 108 performs a disconnection process for the call to the local station (ST613).

  When the disconnection process is performed by the CPU 108, no instruction or request is output from the ISDN control unit 101 to the MFP main body 103. If multifunction device main body 103 does not accept an instruction or request from ISDN control section 101 for a certain period of time, an instruction to shift to an energy saving mode is output from multifunction apparatus main body 103 to ISDN control section 101 (ST614).

  When this energy saving mode transition instruction is accepted, the ISDN control unit 101 performs the above-described Layer1 activation type determination process (ST615). In addition, when processing the flow shown in FIG. 6, since it is a case where it shifts to power-down mode, it is determined that it is always started.

  If it is determined that the Layer 1 activation type is always activated, the CPU 108 places the other ICs 110 such as the HDLC controller 304 and the audio CODEC 305 in a power-down state (ST616). Thereafter, an energy saving mode transition response for notifying the MFP main body 103 of the energy saving mode transition is output (ST617).

  In MFP main body 103, upon receipt of the energy saving mode transition response, main power supply SW 107 is switched to the off state (ST618). When the main power SW 107 is switched off, the power SW 113 is automatically switched off. When power SW 113 is turned off, power supply to main CPU 111 is stopped (ST619). Thereafter, the process returns to ST601, and the reception of the SETUP is monitored again.

  In the power-down mode, the bus is maintained in the non-separated state by the bus switch 312. Therefore, as in the standby mode shown in FIG. It cannot be switched to a state.

  As described above, according to the ISDN control unit 101 according to the present embodiment, the ISDN activation mode is identified according to the Layer 1 activation type obtained via the S / T controller 109, and the activation mode is always activated. The power down mode is released by returning a specific component from the operation stop state. For this reason, the operation stop state of a specific component can be operated according to the activation mode of ISDN. As a result, since power supply to a specific component can be operated, power saving can be efficiently achieved according to the activation mode of ISDN.

  Further, in the ISDN control unit 101 of the present embodiment, when a call addressed to the own station is detected from the call setting information obtained via the S / T controller 109, a specific component is returned from the operation stop state. Power-down mode is canceled. Therefore, the operation stop state of a specific component can be operated according to the contents of the call setting information. As a result, since power supply to a specific component can be operated, it is possible to efficiently save power according to the contents of the call setting information in combination with the ISDN activation mode.

  On the other hand, when a call other than the call addressed to the own station is detected, the power down mode is not canceled and is maintained as it is. Therefore, for example, when a plurality of terminals are connected to the communication line, when a call other than a call addressed to the local station is detected, the power-dan mode is canceled and a situation where power is supplied is avoided. Thus, power saving can be achieved.

  According to the ISDN control unit according to the present invention and a multi-function machine equipped with the ISDN control unit, it is possible to save power for peripheral circuits in accordance with the start mode of ISDN, and a multi-function machine excellent in power saving is provided. Useful in terms.

1 is a block diagram showing a configuration around an ISDN control unit (ISDN control unit) in a multifunction machine according to an embodiment of the present invention. The figure for demonstrating the state of D + by which the wake-up signal is considered in the line terminal main function part connected to the ISDN control unit which concerns on the said embodiment Block diagram showing the configuration of the ISDN control unit according to the above embodiment (power down mode) Block diagram showing the configuration of the ISDN control unit according to the above embodiment (standby mode) Flow chart for explaining the operation when the ISDN control unit according to the above embodiment returns from the standby mode Flow chart for explaining the operation when the ISDN control unit according to the above embodiment returns from the power down mode The figure for demonstrating the discrimination | determination process of Layer1 starting type in the ISDN control unit which concerns on the said embodiment

Explanation of symbols

101 ISDN Control Unit 102 Line Terminal Main Function Unit 103 MFP Main Body 105 Power Supply Unit 106 Constant Power Supply 107 Main Power Supply SW
108 CPU
109 S / T controller 111 Main CPU
112 Energy-saving microcomputer 113 Power switch
303 G4 fax control unit 306 G3I fax control unit

Claims (3)

An ISDN control unit for controlling a facsimile function executed in the main body of the multi- function device, according to the interface means for connecting to the ISDN network and the activation type defined by Layer 1 obtained via the interface means Identification means for identifying the activation mode of the ISDN, and control means for shifting to the energy saving mode for reducing the power consumption of the unit according to the activation mode. When the identification means identifies that the ISDN activation mode is always activated when the identification unit is instructed, the operation proceeds to a power-down mode in which specific components of this unit are deactivated to reduce power consumption. is, when said ISDN startup mode is identified as a call for each activation by the identification means, the specific component The bus connection switch said particular component is connected as well as to the work stopped in the OFF state to stop the power supply of the to a particular component, further reduce power consumption than the power-down mode Standby An ISDN control unit that is shifted to a mode. When the control means detects a call addressed to itself from call setting information obtained via the interface means, the control means turns on the connection switch to resume power supply to the specific component, and 2. The ISDN control unit according to claim 1, wherein the standby mode is canceled.   When the control unit detects a call addressed to itself from the call setting information obtained via the interface unit, the control unit returns a specific component from the operation stop state and cancels the power down mode. The ISDN control unit according to claim 1.

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