TW201233083A - Home-side device, optical transceiver, communication system and power supply method - Google Patents

Abstract

A home-side device (202) comprises: a plurality of power sources (64 to 66, 68, 88 to 90) which are provided corresponding to a station-side device (201) and a plurality of electrical circuits (74, 75, 83 to 85) for transmitting or receiving optical signals, said power sources (64 to 66, 68, 88 to 90) being for supplying power to the corresponding electrical circuits; a power-saving request receiving section (29) for receiving from the station-side device (201) notification of a power-saving period in which a power-saving operation is to be performed by the home-side device (202); and a power source control section (29) for planning power supply start/stop sequences for the power sources in accordance with the response time of the electrical circuits with respect to the starting/stopping of power supply from the corresponding power sources and the power-saving period. The power sources (64 to 66, 68, 88 to 90) supply power to the corresponding electrical circuits in accordance with the sequences planned by the power supply control section (29). In this way, power saving can be achieved and throughput can be improved.

Description

201233083 VI. Description of the Invention: [Technical Field] The present invention relates to a home side device, an optical transceiver, a communication system, and a power supply method, and more particularly to a house side device, an optical transceiver, and a communication for achieving power saving System and Power Supply Method [Prior Art] In recent years, with the widespread use of the Internet, users have access to various information on websites operated around the world, and this information is available. Along with this, devices that can access broadband such as ADSL (Asymmetric Digital Subscriber Line) and FTTH (Fiber To The Home) are becoming more and more popular. In IEEE Std 8 02. 3 ah (registered trademark)-2004 (Non-Patent Document 1), it is disclosed that an optical communication line is shared by a plurality of home-side devices (〇NU: Optical Network Unit) and an office-side device (OLT: Optical) Line Terminal) A method of media sharing communication for data transmission, that is, Passive Optical Network (PON). That is, it includes the user information through P ON and the control information needed to manage the use of PON. All information is EP ON (Ethernet) communicating in the format of Ethernet (registered trademark) frame. (registered trademark) P ON ) , and EPON access control agreement (MPCP (Multi-Point Control Protocol)) and OAM (Operation Administration and Maintenance) agreement. By exchanging the C P C P frame between the office side device and the home side device, it is possible to add, detach, and store the home side device. Further, Non-Patent Document 1 describes a method of registering a new home side device by a Μ P C P message, a report indicating a bandwidth allocation request, and a gate indicating a communication instruction. In addition, as the next generation technology of EPON, which is a communication speed of 1 Gbit/s, which is GE-PON (Giga Bit Ethernet (registered trademark) passive optical network), it is standardized to become 10GE-EPON of WEESi^Jav (registered trademark)-2009. That is to say, the communication speed is equivalent to 10 Gbit/s EPON, and the access control protocol is also based on MPCP. Here, in order to reduce the power consumption of the PON system, various methods for causing the ONU to save power during the period of communication with the station side device are under discussion. An example of a method for achieving power saving in a PON system is disclosed in Japanese Laid-Open Patent Publication No. Hei. No. 201 0-2 1 3259 (Patent Document 1). That is, in order to start energy saving by the user device and the network device, information from the user device and the network device is used to perform energy saving on the connected optical network, for example. Any of the user device or the network device initiates a sleep mode for the user device. By performing the sleep mode with the user device, the user device's transmitter and receiver will turn off the power for a predetermined period of time (sleep time). During the sleep period, the transmitter and the receiver do not consume power. In addition, the laser drive circuit used in the optical communication device is disclosed in Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. 201-267924 (Patent Document 2). : a modulation circuit that supplies a modulated current to a laser diode along with the input squib data: and

-6- 201233083 The bias circuit is to apply a bias current to the laser diode; and the APC circuit controls the modulation current and the bias current to obtain the desired luminous intensity and extinction in the laser diode. ratio. When the transmission enable signal is on, the laser diode system is driven by the squib with the input squib data. When the transmission enable signal is off, the laser diode system is extinguished. The modulation circuit includes a modulation current intercepting circuit, which interrupts the variable current when the transmission enable signal is off; the bias circuit includes a bias current interruption circuit when the transmission enable signal is off. The bias current is interrupted. [Prior Art Document] [Patent Document 1] JP-A-2010-213259 (Patent Document 2) JP-A-2010-267924 SUMMARY OF INVENTION [Problems to be Solved by the Invention] Generally speaking, The starting time from the start of the supply of electric power to the electric circuit to the start of the operation of the electric circuit is different for each electric circuit. The laser driving circuit described in Patent Document 2 uses, for example, an AC coupling (in the first-stage gate circuit in the modulation circuit) in the squib transmitting portion required for transmitting the squib signal. Capacitive coupling) to communicate data signals. Therefore, due to the time constant of the AC coupling circuit, the start time of the gate circuit will be the longest. Then, in the laser drive circuit described in Patent Document 2, the current supply to each electric circuit is controlled 201233083 by a common transmission enable signal. Therefore, for example, when the laser driving circuit is provided by the ONU, the activation time of the entire ONU is determined by the slowest starting gate circuit among the electrical circuits in the laser driving circuit. That is, in the ONU, if the startup time of a part of the electric circuit becomes long, the power saving operation may not be performed depending on the length of the power saving period required from the office side device, or may be from the power saving state to the normal state. The recovery is slower, resulting in lower performance of the PON system. The present invention has been made in order to solve the above problems, and an object of the invention is to provide a house side device, an optical transceiver, a communication system, and a power supply method that can achieve power saving while achieving an improvement in performance. [Means for Solving the Problem] In order to solve the above problem, the house side device according to a certain aspect of the present invention belongs to a house side device required for receiving an optical signal with the office side device, and includes: The plurality of electrical circuits are configured to transmit or receive the upper optical signal: and the plurality of power supplies, which are provided corresponding to the electrical circuit, and supply electric power to the corresponding electrical circuit, and can control the start and stop of the power supply: the power saving requirement is received. The signal is used to receive a notification from the upper office side device that the power saving period is required to perform the power saving operation on the home side device; and the power control unit is configured to record the power source according to each of the upper electrical circuits. The response time of the start and stop of the power supply, and the power-saving period, the program for starting and stopping the power supply of each power source is planned; the power supply is based on the above-mentioned program written by the power supply control unit. The power supply to the electrical circuit is recorded in correspondence. -8 - 201233083 Thereby, the circuit for stopping the power supply and the circuit for continuing the power supply can be selected in accordance with the length of the power saving period required from the office side device, so that the power saving operation in a shorter period is also possible. Both power saving and performance improvement can be considered at the same time. In the above-mentioned power supply control unit, it is determined whether or not the power supply of each electric circuit is stopped in accordance with the comparison result. According to this configuration, it is possible to appropriately determine whether or not the power supply to each electric circuit is stopped by a simple process. The above-mentioned home side device further includes an optical transceiver that can be attached to and detached from the upper house side device, and has at least one of each of the electrical circuits; and the upper optical transceiver is provided with at least one electrical circuit. The above response time is remembered; the power control unit is written to read the response time remembered by the optical transceiver. In this way, the response time of each electrical circuit is memorized in the optical transceiver that can be attached to and detached from the home side device, and the power supply control unit can read the response time of each response time, even if the response time of each electrical circuit is different. The replacement of the new optical transceiver can still be used to save power. The power control unit is programmed to record the program so that each electric circuit can be operated until the time when the upper-station home device has to continue the transmission of the optical signal. According to this configuration, since the timing of the power-saving processing of each of the home-side devices in the communication system can be common, it is easy to control and manage the home-side devices in the host device, for example, the office-side device. -9 - 201233083 The above-mentioned house side device is provided with an electric circuit including a light-emitting element and an electric circuit for supplying a modulated current to the light-emitting element. In this way, by considering an electrical circuit that consumes a large amount of power and has a large difference in response time, it is considered as a power-saving process, and an appropriate power saving and efficiency improvement effect can be obtained by appropriate power supply control. In order to solve the above problems, an optical transceiver according to a certain aspect of the present invention is an optical transceiver that can be attached to and detached from a house side device required for receiving an optical signal with a central office device, and has a plurality of optical transceivers. The electrical circuit is configured to transmit or receive the upper optical signal; and the plurality of power supplies are provided corresponding to the electrical circuit, and the electric circuit is supplied with electric power, and the start and stop of the electric power supply can be controlled; the memory unit is a memory. The response time of each electric circuit to the start and stop of the power supply of the corresponding power source is recorded, and each of the above-mentioned response times can be read from the above-mentioned home side device; the power sources are listed based on the plan of the home side device The procedure for starting and stopping the power supply of each power source is described above, and the power supply to the electric circuit is recorded in correspondence. In this way, in the home side device, the activation time of each electrical circuit written in the memory unit in the optical transceiver can be referred to from the outside of the optical transceiver, and thus, in the home side device, Choose which part of the energy to save and perform self-discipline power saving control. In order to solve the above problem, the communication system according to a certain aspect of the present invention belongs to a communication system including one or a plurality of house-side devices and a side device required for receiving optical signals with each of the home-station devices. Each of them

-10- 201233083 The above-mentioned home side device includes: a plurality of electrical circuits for transmitting or receiving the above-mentioned optical signals; and a plurality of power supplies, which are provided corresponding to the electrical circuits on the above, and supplies electric power to the corresponding electrical circuits, and can be controlled The start and stop of the power supply; the above-mentioned communication system includes: a power supply control unit for performing a response time based on the start and stop of the power supply to the corresponding upper power source, and the home side device must be saved During the power-saving period of the electric operation, a program for starting and stopping the power supply of each of the power sources is planned: each of the power sources is recorded on the electric circuit based on the above-mentioned program written by the power source control unit. Power supply. Thereby, the circuit for stopping the power supply and the circuit for continuing the power supply can be selected in accordance with the length of the power saving period required from the office side device, so that the power saving operation in a shorter period is also possible, thereby saving power and performance. Enhance both at the same time. In order to solve the above problem, the power supply method according to a certain aspect of the present invention is a power supply method, and is a power supply method belonging to a home side device. The home side device includes a plurality of electrical circuits for use in a game. The side device transmits or receives the optical signal; and the plurality of power sources are provided corresponding to the electrical circuit, and supplies power to the corresponding electrical circuit, and can control the start and stop of the power supply; Receiving a notification of a power-saving period in which the home-side device must perform a power-saving operation; and a response time based on the start and stop of the power supply to the corresponding power source, and the power-saving period. The procedure of the program for starting and stopping the power supply of each power source is planned; and the power supply of the electric circuits of each of the -11 - 201233083 is recorded from the above power sources based on the program on the plan. Thereby, the circuit for stopping the power supply and the circuit for continuing the power supply can be selected in accordance with the length of the power saving period required from the office side device, so that the power saving operation in a shorter period is also possible, thereby saving power and performance. Enhance both at the same time. [Effect of the Invention] According to the present invention, it is possible to achieve power saving and at the same time achieve an improvement in performance. [Embodiment] Hereinafter, embodiments of the present invention will be described using the drawings. In the drawings, the same or equivalent components are designated by the same reference numerals and the description thereof will not be repeated. FIG. 1 is a diagram showing the configuration of a PON system according to an embodiment of the present invention. Referring to Fig. 1, a PON system 301 is, for example, a 10G-EPON, and includes home side devices 202A, 202B, 202C, and 202D, a office side device 201, and splitters SP1 and SP2. The home side devices 202A, 202B, 202C and the office side device 201 are connected through the splitters SP1 and SP2 and the optical fiber OPTF, and can receive optical signals from each other. The home side device 202D and the office side device 201 are connected through the splitter SP2 and the optical fiber OPTF, and can receive optical signals from each other. Fig. 2 is a view showing the configuration of a house-side device in the p ON system according to the embodiment of the present invention.

-12- 201233083

Referring to Fig. 2, the home side device 2〇2 (the collective name of the home side device 2〇2A, 2〇2B, 2〇2C, and 202D) is provided with an optical transceiver 21, a poN reception processing unit 22, a buffer memory 23, UN transmission processing unit 24, UNI (User Network Interface) 埠25, UN reception processing unit 26, buffer memory 27, PON transmission processing unit 28, and control unit (power saving request receiving unit and power supply control unit) 29 ° Optical transceiver 2 1, can be loaded and unloaded on the home side device 2 〇2. The optical transceiver 2 1 ' receives the downlink optical signal transmitted from the office side device 20 1 , converts it into an electrical signal, and outputs the P ON receiving processing unit 22 according to the received from the optical transceiver 21 . The electrical signal reconstitutes the frame, and the frame is assigned to the control unit 29 or the UN communication processing unit 24 depending on the type of the frame. Specifically, the PON reception processing unit 22 outputs the data frame to the UN transmission processing unit 24 via the buffer memory 23, and outputs the control frame to the control unit 29. The control unit 29 generates a control frame containing various control information, and outputs it to the UN communication processing unit 24. The UN message processing unit 24 transmits the data frame received from the PON reception processing unit 22 and the control frame received from the control unit 29 to the personal computer (not shown) via the UNI 埠 25 User terminal. The UN reception processing unit 26 outputs the data frame received from the user terminal via the UNI 埠 25 to the PON transmission processing unit 28 via the buffer memory 27, and the user terminal via the UNI 埠 25 The received control frame is output to the control unit 29 » control unit 29, which performs home side processing related to control and management of the PON line between the office side device 201 such as MPCP and OAM and the home side-13-201233083 device 202. . That is, the MPCP information and the OAM message are exchanged with the office side device 201 connected to the PON line to perform various controls such as access control. The control unit 29 generates a control frame containing various control information and outputs it to the PON transmission processing unit 28. Further, the control unit 29 performs various setting processes for each unit in the house side device 202. The PON transmission processing unit 28 outputs the data frame received from the UN reception processing unit 26 and the control frame received from the control unit 29 to the optical transceiver 21, and the optical transceiver 21' The data frame and the control frame received from the PON transmission processing unit 28 are converted into optical signals and transmitted to the office side device 201. Fig. 3 is a view showing the configuration of an optical transceiver in a house side device according to an embodiment of the present invention. Referring to Figure 3, optical transceiver 21 has a plurality of electrical circuits required to transmit or receive optical signals. More specifically, the optical transceiver 21 includes: a spurt transmitting unit 31, a stimuli receiving unit 32, a main control I/F (interface) 69, a CPU (Central Processing Unit) 70, a compliance I/F 71, and a control Register 72. The spurt transmitting unit 31 is an electric circuit required for transmitting an optical signal, and includes a transmission modulation circuit 74 and a light-emitting circuit 75. Further, the burst transmitting unit 31 includes power sources 64 to 66, a sequence circuit 67, and a bias circuit 68. The CPU 70 includes, for example, a memory unit 73 belonging to an EEPROM (Electrically Erasable Programmable Read Only Memory). The transmission modulation circuit 74 includes a pre-buffer circuit 61, an equalizer circuit 62, an output buffer circuit 63, and capacitors C1, C2 201233083. The pre-buffer circuit 61 includes a resistor R. The light-emitting circuit 75 includes a light-emitting element LD and inductors L1 and L2. Further, the stimulator receiving unit 32 is an electric circuit required for receiving an optical signal, and includes a light receiving element PD, a TIA (transimpedance amplifier) 81, a LIA (limiting amplifier) 82, and a CDR (Clock and Data Recovery). 83. The equalizer circuit 84' outputs a buffer 85 and capacitors C3 to C6. Further, the explosion receiving unit 32 includes power sources 86 to 90. In the spurt transmitting unit 31, the pre-buffer circuit 61 receives the data frame from the UN reception processing unit 26 and the control frame from the control unit 29, that is, the transmission data, through the capacitors C1 and C2. The data to be sent will be increased and then output. For example, the pre-buffer circuit 6 1 receives the signal to be transmitted as a balanced signal from the signal lines INP and INN. The equalizer circuit 62 performs waveform shaping such as phase distortion correction from the transmission data received from the pre-buffer circuit 61, and then outputs the output buffer circuit 63 based on the equalizer circuit 62. The transmitted data is supplied to the light-emitting circuit 75 to supply a modulated current. The illumination circuit 75 transmits the upstream optical signal to the office side device 20 1 . In the light-emitting circuit 75, the light-emitting element LD is connected to the power supply node to which the power supply voltage Vddl is supplied, via the inductor L1, and the bias circuit 68 is connected via the inductor L2. The light-emitting element LD emits light based on a bias current supplied from the bias circuit 68 and a modulated current supplied from the output buffer circuit 63, and changes the light-emission intensity. The power supplies 64 to 66 supply current to the pre-buffer circuit 61, the equalizer circuit 62, and the -15-201233083 snubber circuit 63 as electric power, and can control the start and stop of the power supply. More specifically, the power sources 64 to 66 switch whether or not to supply current to the pre-buffer circuit 61, the equalizer circuit 62, and the output buffer circuit 63, respectively, based on the transmission disable signal received from the control unit 29. The bias circuit 68 supplies, for example, a bias current to the light-emitting circuit 75 as electric power. Further, the bias circuit 68 switches whether or not the bias current is supplied to the light-emitting circuit 75 based on the communication disable signal and the stimuli enable signal received from the control unit 29. Specifically, when the power transmission 64 to 66 is invalidated, the pre-buffer circuit 61, the equalizer circuit 62, and the output buffer circuit 63 are respectively supplied with power, and when the transmission disable signal is When it is activated, the power supply is stopped. Moreover, the bias circuit 68 is configured to supply power to the light-emitting circuit 75 when the signal-disabling signal is invalidated and the stimuli enable signal is activated, and the other case stops the illuminating circuit 75. Power supply. The CPU 70 exchanges various materials with the control unit 29 via, for example, an I2C bus bar formed by the signal line SCL and the signal line SDA. The main control I/F 69 provides the interface function between the CPU 70 and the I2C bus. 服 The I/F 71 is provided to provide the interface between the CPU 70 and the control register 72. The CPU 70 writes various control data to the control register 72 by obeying the I/F 71. Further, the memory unit 73 in the CPU 70 memorizes the response times of the start and stop of the power supply to the pre-buffer circuit 61, the -16-201233083 equalizer circuit 62, the output buffer circuit 63, and the light-emitting circuit 75, respectively. . For example, the response time is the start-up time of the pre-buffer circuit 61, the equalizer circuit 62, the output buffer circuit 63, and the light-emitting circuit 75' from receiving power supply from the corresponding power supply or bias circuit. And the sum of downtime from the stop of power supply to the stop of operation. Among the pre-buffering circuit 31, the pre-buffer circuit 61, the equalizer circuit 62, the output buffer circuit 63, and the light-emitting circuit 75, the response of the pre-buffer circuit 61 is the slowest, and the start-up time of the pre-buffer circuit 61 is The time constant r due to the capacitors Cl, C2 for AC coupling and the terminating resistor R. The power supply 66 changes the amount of supply current to the output buffer circuit 63 based on the control data APC1 written in the control register 72. The bias circuit 68 changes the amount of supply current to the light-emitting circuit 75 based on the control data APC2 written in the control register 72. The sequence circuit 67 stops the supply of the current of the power source 66 based on the current supply control of the power source 66 caused by the transmission disable signal based on the stimuli enable signal received from the control unit 29. In the sounding and receiving unit 32, the light receiving element PD converts the optical signal received from the office side device 201 into a current and outputs it. The TIA 81 converts the current received from the light receiving element PD into a voltage 'output to the LIA 82 via the capacitors C3 and C4. The LIA82 outputs the voltage of the voltage received from the TIA81 as a receiving data. The CDR 83 performs shaping of the received data received from the LIA 82, and -17-201233083 extracts the timing from the received data, and performs timing reconfiguration of the received data based on the extracted timing to match the side device. 20 1 Establish synchronization. The equalizer circuit 84 performs waveform shaping, for example, correction of phase distortion, from the received data received from the CDR 83, and then outputs it. The output buffer 85 amplifies the received information received from the equalizer circuit 84 and outputs it to the P ON reception processing unit 22 through the capacitors C5 and C6. For example, the output buffer 85 outputs the received data as a balanced signal from the signal lines OUTP, OUTN. The power supplies 86 to 90 supply current to the TIA 81, LIA 82, CDR 83, equalizer circuit 84, and output buffer 85 as electric power. Further, the power source 8 8 to 90 controls the start and stop of the power supply. More specifically, the power supplies 88 to 90 switch whether or not to supply current to the CDR 83, the equalizer circuit 84, and the output buffer 85 based on the reception disable signal received from the control unit 29. Specifically, when the power-receiving signals 88 to 90 are invalidated, the CDR 83, the equalizer circuit 84, and the output buffer circuit 85 are respectively supplied with power, and the reception is disabled. The signal is validated. At that time, the power supply should be stopped. Hereinafter, in some cases, the power sources 64, 65, 66, the bias circuit 68, and the power supply 8, 8, 89, 90 are simply referred to as "power sources". Further, the memory unit 73 in the CPU 70 memorizes the response times of the start and stop of the power supply to the CDR 83, the equalizer circuit 84, and the output buffer 85, respectively. For example, the response time is such that the CDR8 3, the equalizer circuit 84, and the output buffer circuit 85 start from the power supply from the corresponding power supply 201233083, and start from the power supply stop to the stop operation. And the downtime. In the burst responding unit 32, among the CDR 83, the equalizer circuit 84 and the output buffer 85, the response of the CDR 83 is the slowest, and the start time of the CDR 83 is the phase lock time of the PLL (Phase Locked Loop) circuit in the CDR 83. Further, in the optical transceiver 21, in order to speed up the phase-locking time of the PLL circuit in the CDR 83, the power supply stop control from the power supplies 86 and 87 to the TIA 81 and the LIA 82 is not performed. However, for example, when the CDR 83 is not provided in the optical transceiver 21, the start and stop of the power supply to the TIA 81 and the LIA 82 can be controlled by outputting the reception disable signal to the power sources 86 and 87. [Operation] Next, the operation of the PON system according to the embodiment of the present invention when the power-saving operation is performed will be described using the drawings. In the embodiment of the present invention, the power supply method according to the embodiment of the present invention is implemented by operating the house side device 202. Therefore, the description of the power supply method according to the embodiment of the present invention is changed to the following description of the operation of the home side device 202. In addition, in the following description, FIG. 1 - FIG. Fig. 4 is a view showing an operation mode of the data flow between the office side device and the house side device in the PON system according to the embodiment of the present invention and the operation mode of the house side device. In Fig. 4, the processing between the office side device and the one house side device will be described, but the same applies to the connection of the plurality of house side devices to the office side device. Referring to Fig. 4, first, in the state of -19-201233083 in which the house-side device 202 operates in the normal mode, the office-side device 201 transmits the gateway frame to the house-side device 202 (step S1), and again, the power-saving mode. The setting frame is sent to the home side device 2 02 . The power saving mode setting frame includes, for example, the power saving period TS and its start timing ta (step S2). Next, the house side device 202 shifts to the power saving mode at the start timing ta of the energy saving period TS (step S3). Further, the home side device 202 transmits the power saving ACK frame for the power saving mode setting frame to the office side device 201 (step S4). Further, the "home side device 202" is determined to operate in the normal mode in accordance with the relationship between the length of the energy-saving period TS and the response time of each electric circuit in the optical transceiver 21, and it is determined that the power saving mode cannot be shifted ( In step S3), the request error frame is transmitted to the office side device 201 (step S4). Next, the home side device 202 shifts from the power saving mode to the normal mode in the power saving period TS end timing tb (step S5). Further, the office side device 201 transmits the gateway frame to the home side device 202 regardless of whether the home side device 202 is operating in the normal mode or in the power saving mode (step S6). Next, the power saving process in the house side device 202 will be described in detail. The control unit 29 receives the power saving operation (energy saving period) in which the home side device 202 is to perform the power saving operation, and receives the notification from the office side device 201. The control unit 29 plans each power source based on the response time of each electric circuit of the optical transceiver 21 to the start and stop of the power supply of the corresponding power source, and the power saving period notified from the office side device 20 1 . The process of starting and stopping the power supply 201233083. For example, the control unit 29 compares the response time of each electric circuit with the power saving period, and determines whether or not the power supply to each electric circuit is stopped in accordance with the comparison result based on the comparison result. Further, when the power saving period TS is completed, the control unit 29 plans a program that enables each electric circuit to operate until the timing is based on the timing at which the home side device 202 has to continue the transmission of the optical signal. . In other words, the stop timing of the power supply to each of the electric circuits in the optical transceiver 21 is set to the timing at which each electric circuit can continue to operate until the end of the energy-saving period TS. Therefore, when the power saving period TS is short, the power supply is not stopped for the electric circuit having a long response time, and then the respective power sources in the optical transceiver 21 are based on the program that has been calculated by the control unit 29. To supply power to the corresponding electrical circuit. As an example of a specific power saving period, first, the response time of each electric circuit in the optical transceiver 2 1 cannot be simply incorporated into the power saving period TS, that is, the response of each electrical circuit in the power saving period TS. The overlap of time is not allowed. Fig. 5 is a flow chart showing the determination of the operation procedure when the house-side device in the P ON system according to the embodiment of the present invention performs the power saving operation. In FIG. 5, time T1 is the response time of the light-emitting circuit 75. The time T2 is the response time of the transmission modulation circuit 74. The response time is the maximum response time among the response times of the pre-buffer circuit 61, the equalizer circuit 62, and the output buffer circuit 63. Time T3 is the maximum response time among the response times of CDR83, equalizer -21 - 201233083 circuit 84 and output buffer 85. Here, for example, time T1 < time T2 < time T3 is assumed. Further, the time Τ1 to Τ3 are stored in the memory unit 73 of the optical transceiver 21 as described above, and the control unit 29 can read the time Τ 1 to Τ 3 from the kobe unit 73 via the I2C bus. Referring to Fig. 5, first, in the normal mode, the control unit 29 receives the gateway frame from the office side device 201 and the power saving mode setting frame. Then, the control unit 29 acquires the energy saving period TS included in the power saving mode setting frame (step S11). Next, when the power saving period TS is time Τ3 or more (NO in step S12), the control unit 29 transmits the power saving ACK frame to the office side device 201 and shifts to the power saving mode. More specifically, the control unit 29 sets the stimuli enable signal to be invalidated (turned off), sets the transmit disable signal to be active (on), and sets the receive disable signal to be active (on). That is, the control unit 29 is connected to the optical transceiver 21, and stops the pre-buffer circuit 61, the equalizer circuit 62, the output buffer circuit 63, the light-emitting circuit 75, the CDR 83, the equalizer circuit 84, and the output buffer 85. Control of the power supply (step S13). Then, the control unit 29 sets the stimuli enable signal to be valid according to the end timing of the power saving period TS, sets the transmission disable signal to be invalidated, and sets the reception disable signal to be invalid (step S19). Further, the control unit 29 transmits the power saving ACK frame to the office side device 201 when the power saving period TS is less than the time T3 (YES in step S12) and is equal to or longer than the time T2 (NO in the step S1 4). Power saving mode. More specifically, in 201233083, the control unit 29 sets the stimuli enable signal to be invalidated, sets the transmission disable signal to be valid, and sets the reception disable signal to be invalidated. That is, the control unit 29 is controlled by the optical transceiver 21 to stop the supply of electric power to the pre-buffer circuit 61, the equalizer circuit 62, the output buffer circuit 63, and the light-emitting circuit 75 (step S15). Then, the control unit 29 sets the stimuli enable signal to be validated in accordance with the end timing of the power saving period TS, and sets the transmission disable signal to be invalidated (step S1 9). Further, when the power saving period TS is less than the time T2 (YES in step S14) and is equal to or longer than the time T1 (NO in step S16), the control unit 29 transmits a request error frame to the office side device 201 to activate the stimuli enable signal. Set to invalidate, set the message disabling signal to invalidate, and set the message disabling signal to invalidate. That is, the control unit 29 does not move to the power saving mode, and the optical transceiver 2 1 performs normal spoofing transmission control for stopping the supply of power to the light-emitting circuit 75 (step S17). Then, the control unit 29 sets the stimuli enable signal to be valid in accordance with the end timing of the power saving period TS (step S1 9). Further, when the power saving period TS is less than the time T1 (YES in step S16), the control unit 29 transmits a request error frame to the office side device 201. That is, the control unit 29 does not migrate to the power saving mode. Further, the control unit 29 does not perform the normal sounding transmission control, and does not perform the power supply stop control of the light-emitting circuit 75 in the optical transceiver 21 (step S18). Fig. 6 is a view showing an application example of the power saving process performed by the house side device according to the embodiment of the present invention. -23-201233083 Referring to Fig. 6, it is considered that from the office side device 20 1 to the home side device 202, in the uplink direction from the home side device 20 2 to the office side device 2 0 1 , the transmission timing of the report 1 to the report In the case of the transmission timing of 2, the transmission of the plurality of squib data is required between 500 sec.

The interval between report 1 and data 1 is TD 1, the interval between data 1 and data 2 is TD2, the interval between data 2 and data 3 is TD3, and the interval between data 3 and report 2 is TD4', which is equivalent to notification from the side device 20 1 For example, the control unit 29 is longer than the response time Τ1 and shorter than the response time Τ2 by the interval TD1, TD3, and TD4. Therefore, in the optical transceiver 21, the power supply to the light-emitting circuit 75 is normally stopped. The signal transmission control (step S17 of Fig. 5). Further, since the control unit 29 is longer than the response time Τ2 and shorter than the response time Τ3, the control unit 29 stops the pre-buffer circuit 61, the equalizer circuit 62, the output buffer circuit 63, and the light emission in the optical transceiver 21. The control of the power supply of the circuit 75 (step S15 of Fig. 5). Next, as another example of the specific power saving process, it is explained that the response time of the transmission modulation circuit 74 and the light-emitting circuit 75 in the optical transceiver 21 does not overlap in the power-saving period TS. The activation and invalidation of signal and message disabling signals. Fig. 7 is a view showing a light output of the home side device and a switching timing of each control signal in the sounding and transmitting unit according to the embodiment of the present invention. Referring to Fig. 7, the burst enable signal is set to be invalidated (timing t1) according to the end of the transmission of the burst data. In this way, the blasting enablement

-24- 201233083 After the transmission delay time td elapses, the bias current starts to decrease (timing t2), and after the time Toff_ben passes, the bias current becomes zero (timing t3). Thereby, in the energy saving period TS, the supply of current to the light-emitting circuit 75 is stopped. Then, after the elapsed time Ton_dis from the timing t3 at which the bias current is zero, the transmission disable signal is set to be valid (timing t4). Thereby, the current supply to the transmission modulation circuit 74 is stopped in the energy saving period TS. Then, after the elapse of the time corresponding to the length of the power saving period TS from the timing t4, the transmission disable signal is set to be invalidated (timing t5). Then, after the time Toff_dis has elapsed, the burst enable signal is set to be valid (timing t6). With this time Toff_dis, the start-up time of the transmission modulation circuit 74 can be ensured. In this way, after the delay time td of the stimuli enable signal is transmitted from the timing t6, the bias current starts to flow (timing t7), and slightly before the timing t9 after the lapse of the time (Ton_benl + time Ton_ben2) The voltage current will become stable. Here, the length of (time Ton_benl + time Ton_ben2) is set such that the bias current becomes stable before the end timing of the energy saving period TS, that is, slightly before the timing t9. Further, the sequence circuit 67 is stopped from the timing t5 to the timing t8, that is, from the timing t7 until the elapse of the time T〇n_ben1, the supply of current from the power supply 66 to the output buffer circuit 63 is stopped. That is, the sequential circuit 67 forcibly stops the supply of the modulated current from the output buffer circuit 63 to the light-emitting circuit 75 until the potential of the bias current is substantially stabilized. Therefore, it is possible to prevent the occurrence of a short circuit or the like due to the flow of the modulated current in the unstable state of the bias current when the -25-201233083 is stopped, so that the circuit operation can be stabilized. Then, at the timing t8 at which the modulation current starts to be supplied, the transmission of the invalid data is started, and at the timing t9, which is the end timing of the power-saving period TS, the transmission of the effective data is started. In FIG. 7, the time BENn of the timing t1 to the timing t3 corresponds to the down time of the light-emitting circuit 75, and the time BENn of the timing t6 to the timing t9 corresponds to the start-up time of the light-emitting circuit 75, (time BENoff + time BENon) is equivalent The response time T1 of the lighting circuit 75. Further, the time T〇n_dis from the timing t3 to the timing t4 is equivalent to the down time of the transmission modulation circuit 74, and the time Toff_dis from the timing t5 to the timing t6 is equivalent to the startup time of the transmission modulation circuit 74 (time) The Ton_dis+ time Toff_dis is equivalent to the response time T2 of the transmission modulation circuit 74. Fig. 7 is a diagram showing a case where the power saving period TS is (time T1 + time T2) or more. In this case, as described above, the current supply to the light-emitting circuit 75 and the current supply to the transmission modulation circuit 74 in the energy-saving period TS are stopped. FIG. 8 is a house side device according to the embodiment of the present invention. The light output and the switching timing of each control signal in the signal transmitting unit. Fig. 8 is a diagram showing a case where the energy saving period T S is not full (time τ 1 + time T 2 ) and is equal to or longer than the time T1. In this case, since the response time T2 of the transmission modulation circuit 74 cannot be ensured in the power saving period TS, the current supply to the transmission modulation circuit 74 is not stopped. The operation in the timings t1 to U in Fig. 8 is the same as that in Fig. 7. 201233083 Next, after the time corresponding to the length of the energy saving period TS has elapsed from the timing t3 at which the bias current is zero, the stimuli enable signal is set to be active (timing t6). Here, after the timing t3 at which the bias current is zero, the transmission disable signal is set to be active. Thereby, in the energy saving period TS, the supply of current to the transmission modulation circuit 74 is continued. Further, the operations in the timings t7 to t9 are the same as those in FIG. Fig. 9 is a flowchart showing another example of the operation procedure when the house-side device in the PON system according to the embodiment of the present invention performs the power saving operation. Similarly to FIG. 5, time T1 < time T2 < time T3 is assumed. Referring to Fig. 9, first, in the normal mode, the control unit 29 receives the gateway frame from the office side device 201 and the power saving mode setting frame. Then, the control unit 29 acquires the energy saving period TS included in the power saving mode setting frame (step S21). Next, when the power saving period TS is less than the time T1 (NO in step S22), the control unit 29 transmits a request error frame to the office side device 201. That is, the control unit 29 does not migrate to the power saving mode. Further, the control unit 29 does not perform the normal stimuli transmission control, and does not perform the power supply stop control of the light-emitting circuit 75 in the optical transceiver 21 (step S2 3). On the other hand, the control unit 29 sets the energy saving period TS to be equal to or longer than the time T1 (YES in step S22) ' (time T1 + time T2) is equal to or less than the time T3 (YES in step S24), and (time T1 + time T2) is the energy saving period. TS or less (YES in step S25) When the energy saving period TS is equal to or longer than time T3 (YES in step S26), the power saving ACK frame is transmitted to the office side device 201-27-201233083, and the mode is shifted to the power saving mode. More specifically, the control unit 29 sets the stimuli enable signal to be invalidated, sets the transmission disable signal to be active, and sets the reception disable signal to be effective. That is, the control unit 29 is connected to the optical transceiver 21, and stops to the pre-buffer circuit 61, the equalizer circuit 62, the output buffer circuit 63, the light-emitting circuit 75, the CDR 83, the equalizer circuit 84, and the output buffer 85. Control of power supply (step S27). Then, the control unit 29 sets the stimuli enable signal to be valid according to the end timing of the energy saving period TS, sets the transmission disable signal to be invalidated, and sets the reception disable signal to be invalidated (step S3 3 ). Further, the control unit 29 sets the energy-saving period TS to be equal to or longer than the time T1 (YES in step S22), (time T1 + time T2) is equal to or less than the time T3 (YES in step S24), and (time T1 + time T2) is equal to or less than the energy-saving period TS. (YES in step S25), when the energy saving period TS is less than the time T3 (NO in step S26), the power saving ACK frame is transmitted to the office side device 201, and the mode is shifted to the power saving mode. More specifically, the control unit 29 sets the stimuli enable signal to be invalidated, sets the transmission disable signal to be valid, and sets the reception disable signal to be invalidated. In other words, the control unit 29 is controlled by the optical transceiver 21 to stop the supply of power to the pre-buffer circuit 61, the equalizer circuit 62, the output buffer circuit 63, and the light-emitting circuit 75 (step S28). Then, the control unit 29 sets the stimuli enable signal to be valid according to the end timing of the power saving period TS, and sets the transmission disable signal to be invalidated (step S33). Further, the control unit 29 sets the energy-saving period TS to be equal to or longer than the time T1 (YES in step S22), and (time T1 + time T2) is equal to or less than the time T3 (YES in step -28-201233083 S24), (time T1 + time T2) If the TS is not full (NO in step S25), the request error frame is sent to the office side device 201, the burst enable signal is set to be invalidated, and the message disable signal is set to be invalid. Set the reception stop signal to invalid. In other words, the control unit 209 does not move to the power saving mode, and the optical transceiver 21 performs normal spurt transmission control that stops the supply of power to the illuminating circuit 75 (step S3 0). Then, the control unit The 29 system sets the stimuli enable signal to be valid according to the end timing of the energy saving period TS (step S33). Further, the control unit 29 sets the energy-saving period TS to be equal to or longer than the time T1 (YES in step S22), (time T1 + time T2) is greater than time T3 (NO in step S24), and T3 is equal to or lower than the energy-saving period TS (YES in step S29). When (time T1 + time T2) is equal to or less than the time TS (YES in step S31), the power saving ACK frame is transmitted to the office side device 201, and the mode is shifted to the power saving mode. More specifically, the control unit 29 sets the burst enable signal to be invalid, sets the message disable signal to be active, and sets the receive disable signal to be valid. That is, the control unit 29 is connected to the optical transceiver 21, and stops to the pre-buffer circuit 61, the equalizer circuit 62, the output buffer circuit 63, the light-emitting circuit 75, the CDR 83, the equalizer circuit 84, and the output buffer 85. Control of the power supply (step S27). Then, the control unit 29 sets the stimuli enable signal to be valid according to the end timing of the power saving period TS, sets the transmission disable signal to be invalidated, and sets the reception disable signal to be invalidated (step S33). Further, the control unit 29 sets the energy saving period TS to be equal to or longer than the time T1 (YES in step -29-201233083 S22), (time T1 + time Τ2) is greater than time Τ3 (NO in step S24), and T3 is equal to or less than the energy saving period TS ( When YES in step S29, (time T1 + time T2) is greater than time TS (NO in step S31), the power saving ACK frame is transmitted to the office side device 201, and the mode is shifted to the power saving mode. More specifically, the control unit 29 sets the stimuli enable signal to be invalidated, sets the transmission disable signal to be invalidated, and sets the reception disable signal to be effective. That is, the control unit 29 is controlled by the optical transceiver 21 to stop the supply of power to the light-emitting circuit 75, the CDR 83, the equalizer circuit 84, and the output buffer 85 (step S32). Then, the control unit 29 sets the stimuli enable signal to be validated according to the end timing of the energy saving period TS, and sets the reception disable signal to be invalidated (step S3 3). Further, the control unit 29 is in the energy saving period. TS is time T1 or more (YES in step S22), (time T1 + time T2) is greater than time T3 (NO in step S24), and if T3 is greater than the energy-saving period TS (NO in step S29), an error is required. The frame is sent to the central office device 201, and the stimuli enable signal is set to be invalidated, the communication disable signal is set to be invalidated, and the reception disable signal is set to be invalidated. In other words, the control unit 209 does not move to the power saving mode, and the optical transceiver 21 performs normal spurt transmission control that stops the supply of power to the illuminating circuit 75 (step S30). Then, the control unit 29 sets the stimuli enable signal to be valid in accordance with the end timing of the power saving period TS (step S33). Incidentally, in the home side device, if the start-up time of a part of the electric circuit becomes long, the length of the power-saving period required from the side-side device is

-30- 201233083 The power saving action may not be possible, or the recovery from the power saving state to the normal state may be slow, resulting in a decrease in the performance of the PON system. On the other hand, in the house side device according to the embodiment of the present invention, the control unit 29 receives the notification of the energy-saving period in which the house-side device 202 is to perform the power-saving operation, and receives it from the office-side device 201. The control unit 29 calculates the power of each power source based on the response time of each electric circuit of the optical transceiver 21 for the start and stop of the power supply of the corresponding power source, and the power saving period notified from the office side device 201. The process of starting and stopping the supply. Then, each of the power sources in the optical transceiver 21 supplies power to the corresponding electric circuit based on the program that has been calculated by the control unit 29. That is, the control of the bias circuit 68 for supplying the bias current to the light-emitting circuit 75 and the control of the power supplies 64 to 66 for supplying the current to the transmission modulation circuit 74 can be individually performed. Thereby, the circuit for stopping the power supply and the circuit for continuing the power supply can be selected in accordance with the length of the power saving period required from the office side device 20 1 , so that the power saving operation in a shorter period is also possible, and thus power saving is achieved. And both performance enhancements can be considered at the same time. Further, in the home side device according to the embodiment of the present invention, the control unit 29 compares the response time of each electric circuit in the optical transceiver 21 with the power saving period, and determines the power saving period based on the comparison result. Whether the power supply to each electric circuit is stopped. According to this configuration, it is possible to appropriately determine whether or not the power supply to each electric circuit is stopped by a simple process. Further, in the home side device according to the embodiment of the present invention, the optical transceivers - 31 - 201233083 21 have a plurality of required electric circuits for receiving optical signals, and can be attached to and detached from the house side device 202. Further, the optical transceiver 21 memorizes the response time of each electric circuit. Further, the control unit 29 reads out the respective response times memorized by the optical transceiver 21. As described above, the response time of each electric circuit is memorized in the optical transceiver 21 that can be detached from the home side device 202, and the control unit 29 can read out the response time, even if the response time of each electric circuit is performed. The replacement of the new optical transceiver, which is different, can still be used to save power. Further, in the house side device according to the embodiment of the present invention, the control unit 29 draws an account so that each electric circuit continues to operate until the home side device 202 continues the timing of transmitting the optical signal. Kind of procedure. According to this configuration, since the timing of the power-saving processing of each of the house-side devices in the PON system can be common, it is easy to control and manage the home-side devices in the host device, for example, the office-side device 20 1 . In addition, the home side device according to the embodiment of the present invention includes a light-emitting circuit 75 including a light-emitting element LD, and a transmission modulation circuit 74 that supplies a modulated current to the light-emitting element LD, and is used as a power-saving process. In the case of electrical circuits, the electrical circuit that consumes a large amount of power and has a large difference in response time is regarded as the object of power-saving processing, so that more appropriate power saving and efficiency improvement can be obtained by appropriate power supply control. effect. Moreover, for example, when the optical transceiver used in the home side device is manufactured by a plurality of manufacturers, there may be a difference in the manufacturing source of the optical transceiver, and the response time of each electrical circuit in the optical transceiver may be Different.

-32- 201233083 Power saving control and its efficiency' depend on the response time of the house side device. Therefore, whenever the optical transceiver in the house side device is replaced, it may need to be changed in the upper device such as the office side device. Power saving procedures. On the other hand, the optical transceiver 21 according to the embodiment of the present invention includes a plurality of electrical circuits for transmitting or receiving optical signals, and a plurality of power supplies for providing corresponding ones corresponding to the electrical circuits. The electric circuit supplies electric power, and can control the start and stop of the electric power supply: and the memory unit 73 stores the response time of each electric circuit to the start and stop of the electric power supply of the corresponding electric power source, and can read from the home side device 202. Each response time. Then, each of the power sources in the optical transceiver 21 supplies power to the corresponding electric circuit based on the procedure of starting and stopping the power supply of each power source that has been calculated by the home side device 208. In this manner, in the home side device 202, the activation time of each electric circuit written in the memory unit 73 in the optical transceiver 21 can be referred to from the outside of the optical transceiver 21, and the home side device is configured as described above. In 202, it is possible to select which part of the energy is to be saved and perform self-discipline power saving control. Further, in the PON system according to the embodiment of the present invention, the power saving mode setting frame transmitted from the office side device 2 0 1 includes the power saving period T S and the start timing thereof, but is not limited thereto. As shown in FIG. 7 and FIG. 8, when the start timing of the TS during the power saving period corresponds to the end timing of the squib signal, if the home side device 2 0 2 can recognize the start timing of the energy saving period τ S , 'The power saving mode setting frame can also not include the start timing of the TS during the energy saving period. Further, in the PON system according to the embodiment of the present invention, in the example shown in FIGS. 6-33-201233083 to FIG. 8, the time interval between the uplink squib signal and the next squib signal is regarded as Although the configuration of the home side device 202 is notified in the energy saving period TS, the present invention is not limited thereto. For example, when the home side device 202 can recognize the start timing of each of the stimuli signals and the length of the squib signal, the time during which the home power device 202 actually performs the power saving operation may be specifically configured. The period from the timing t4 to the timing t5 in FIG. 7 or the period from the timing t3 to the timing t6 in FIG. 8 is notified to the house side device 202 as the energy saving period TS. Further, in the home side device according to the embodiment of the present invention, the electric circuit in the optical transceiver 21 is used for power saving, but the present invention is not limited thereto, and the electric circuit outside the optical transceiver 21 may be regarded as In order to configure the power-saving object, the electric circuit in the optical transceiver 21 and the electric circuit outside the optical transceiver 21 may be regarded as a power-saving object. Further, in the PON system according to the embodiment of the present invention, the office side device 201 notifies the home side device 202 of the energy saving period TS, and the control unit 29 of the house side device 202 is based on the optical transceiver 21. The response time of each electric circuit and the energy-saving period TS are configured to plan the start and stop of the power supply of each power source in the optical transceiver 21, but are not limited thereto. In the device (not shown) other than the house side device 202 and the office device 201 in the PON system 301, at least one of the above-described notification of the energy saving period and the power supply program may be executed. Further, in the PON system according to the embodiment of the present invention, the response time stored in the memory unit 73 is designed such that each of the electric circuits in the optical transceiver 21 receives the corresponding power source or bias. The power supply of the voltage circuit -34 - 201233083 is the sum of the start time until the start of the operation and the down time from the power supply stop to the stop operation, but is not limited thereto. The response time memorized by the memory unit 7 can also be either one of the above-mentioned start time and the last down time. All of the above embodiments are for illustrative purposes only and should not be construed as limiting. The scope of the present invention is not to be construed as being limited by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the configuration of a P ON system according to an embodiment of the present invention. FIG. 2 is a configuration of a house side device in a P〇N system according to an embodiment of the present invention. Icon. Fig. 3 is a view showing the configuration of an optical transceiver in a house side device according to an embodiment of the present invention. Fig. 4 is a view showing the flow of data between the office side device and the house side device in the PON system according to the embodiment of the present invention, and the operation mode of the house side device. Fig. 5 is a flow chart showing the determination of the operational procedure when the home side device in the PON system according to the embodiment of the present invention performs the power saving operation. Fig. 6 is a view showing an application example of the power saving process performed by the house side device according to the embodiment of the present invention. Fig. 7 is a view showing the light output of the house side device according to the embodiment of the present invention and the switching timing of each control signal in the -35-201233083 bursting and transmitting unit. Fig. 8 is a view showing the timing of switching between the light output in the house side device and the control signals in the signal transmitting unit according to the embodiment of the present invention. Fig. 9 is a flowchart showing another example of the operation procedure when the home side device in the PON system according to the embodiment of the present invention performs the power saving operation. [Description of main component symbols] 21: Optical transceiver 22: PON reception processing unit 23: Buffer memory 24: UN transmission processing unit 25: UNI淖 26: UN reception processing unit 27: Buffer memory 28: PON transmission Processing unit 29: control unit (power saving request receiving unit and power supply control unit) 3 1 : squib transmitting unit 32: stimuli receiving unit 61: pre-buffer circuit 62: equalizer circuit 63: output buffer circuit 64~66, 86~90: Power supply 67: Sequential circuit 6 8 : Bias circuit

-36- 201233083

69: Master I/F

70 : CPU

71 : Obey I/F 72 : Control register 7 3 : Memory unit 74 : Transmission modulation circuit 75 : Light-emitting circuit

81 : TIA

82 : LIA

83 : CDR 84 : equalizer circuit 8 5 : output buffer 2 Ο 1 : side device 2 02 A ' 202B, 202C, 202D: home side device 301 : PON system C 1 to C6 : capacitor R : resistance LD : Light-emitting element PD: Light-receiving element L1, L2: Inductor INP, INN, SCL, SDA: Signal line SP1, SP2: Splitter OPTF: Fiber-37-

Claims (1)

201233083 VII. Patent application scope: 1 · A house side device belongs to the house side device required for receiving optical signals with the central office device, and is characterized in that it has: a plurality of electrical circuits for transmitting or receiving pre-records The optical signal; and the plurality of power supplies are provided corresponding to the pre-recorded electric circuit, and supply electric power to the corresponding electric circuit, and can control the start and stop of the power supply: and the power-saving request receiving unit is used for the front office side. The device receives a notification of a power saving period in which the home side device must perform a power saving operation; and the power source control unit is configured to respond to the start and stop of the power supply of the corresponding power source according to each of the preceding electric circuits, And the pre-recording power-saving period, the program for starting and stopping the power supply of each of the pre-recorded power supplies is planned. The pre-recording power supply is based on the pre-recorded program planned by the pre-recorded power supply control unit to perform the electric power to the electric circuit before the correspondence. supply. 2. The house side device according to claim 1, wherein the pre-recording power supply control unit compares the pre-recording response time of each of the electric circuits and the pre-recording power-saving period, and determines the pre-recording power-saving period based on the comparison result. Go ahead and check if the power supply to each electrical circuit is stopped. 3. The home side device according to claim 1 or claim 2, wherein the front house side device further includes: an optical transceiver that can be attached to and detached from the front house side device, and has a pre-recorded electrical circuit At least one; -38- 201233083 The pre-recorded optical transceiver ” remembers the pre-recording time of at least one electrical circuit in advance; the pre-recording power control unit reads the pre-recording time memorized by the pre-recording optical transceiver. 4. The home side device according to any one of the claims 1 to 3, wherein the 'previous power supply control unit is a pre-programming program, so that the pre-recorded home side device must continue the pre-recording of the optical signal transmission. Before the timing, the pre-recorded electrical circuits can operate. The home side device according to any one of the preceding claims, wherein the front house side device is provided with an electric circuit including a light emitting element and a supply of a modulated current to the front side light emitting element. The electrical circuit is used as a pre-recorded electrical circuit. 6 - An optical transceiver is an optical transceiver that can be used for loading and unloading a home side device required for receiving optical signals with a central office device, and is characterized in that: a plurality of electrical circuits are provided for transmitting Or receiving the pre-recorded optical signal; and the plurality of power supplies are provided corresponding to the pre-recorded electric circuit, supplying electric power to the corresponding electric circuit, and controlling the start and stop of the electric power supply: Hutchison, remembering each pre-recorded electric circuit For the response time of the start and stop of the power supply corresponding to the previous power source, the pre-recording response time can be read from the pre-recorded home side device; the pre-recorded power sources are based on the pre-recorded power supplies of the pre-recorded house-side device. The procedure for starting and stopping the power supply is to supply the electric power to the electric circuit of the previous -39-201233083. 7. A communication system belonging to a communication system having one or more home side devices and a side device required for receiving optical signals with each of the front house devices, wherein each of the front house devices The system includes: a plurality of electrical circuits for transmitting or receiving a pre-recorded optical signal; and a plurality of power supplies corresponding to the pre-recorded electrical circuit, supplying power to the corresponding electrical circuit, and controlling the start and stop of the power supply. The communication system includes: a power supply control unit for responding to the start and stop of the power supply to the previous power source of each of the preceding electric circuits, and the power saving period for the power saving operation of the front-side home device. The program for calculating the start and stop of the power supply of each of the pre-recorded power sources is as follows: The power supply is supplied to the electric circuit corresponding to the electric circuit based on the pre-recorded program planned by the pre-recorded power supply control unit. 8. A power supply method, belonging to a power supply method for a home side device, the house side device comprising: a plurality of electrical circuits for transmitting or receiving optical signals with the office side device; and a plurality of power sources corresponding to the predecessor The electric circuit is provided to supply electric power to the electric circuit corresponding to the previous electric circuit, and can control the start and stop of the electric power supply. The utility model is characterized in that: the utility model is characterized in that: the front office side device receives the power saving required to perform the power saving operation on the front side device. The step of notifying the period; and calculating the power supply of each of the pre-recorded power sources according to the response time of each of the pre-recorded electrical circuits for the start and stop of the power supply for the previous power source -40-201233083 The steps of starting and stopping the program; and the step of recording the power supply to each of the electrical circuits from the previous power source based on the pre-planning program. -41 -