JP5545764B2 - Optical line subscriber side termination equipment - Google Patents

Description

  The present invention relates to an optical line subscriber-side terminating device as a subscriber-side device connected to a station-side device in an PON system via an optical line and an optical coupler.

  A PON (Passive Optical Network) system includes an optical line terminal aggregate side apparatus (SLT) or an optical line station side terminal apparatus (OLT) as a station side apparatus connected to a network, and a subscriber. An optical line subscriber-side terminal device (ONU; Optical Network Unit) or an optical line subscriber-side terminal device (ONT; Optical Network Terminal) as a device on the subscriber side to which a terminal or the like is connected. It has a basic configuration connected via an optical coupler. Hereinafter, the station side device is abbreviated as “OLT”, and the subscriber side device is abbreviated as “ONU”.

  A DSL (Digital Subscriber Line) service that has led the broadband service in the access network up to that time, the FTTH (Fiber To The Home) system has spread as a conventional system that communicates with optical signals via an optical line. Subscribers declined. The development of the PON system played a part in the spread of FTTH. In particular, in 2004 (Institute of Electrical and Electronics Engineers), GE-PON (Gigabit Ethernet (registered trademark)-PassiveNk) was passed. Many domestic carriers have introduced this GE-PON system in combination with the high standardization and high compatibility with the IP (Internet Protocol) of the communication network that has been promoted rapidly since then. In recent years, with the spread of video distribution on the Internet and applications such as P2P (Point to Point), broadband access has become particularly rapid in access networks, and in the future, services such as higher-definition video distribution will continue. With the advent, access networks will be required to have a larger capacity. For this reason, the IEEE 802.3 working group has standardized 10G-EPON as a next-generation PON system, which has a transmission speed 10 times that of GE-PON.

  As described above, while the bandwidth of the network is advanced, an increase in power consumption of the information communication device is a problem. The information communication device corresponds to the wide band by increasing the communication speed like the above-mentioned 10G-EPON system, and generally the increase in the communication speed increases the power consumption. In recent years, there has been a growing interest in power saving worldwide, including environmental issues, and specific guidelines for establishing power saving / methods for ICT (Information and Communications Technology) Discussions for maintenance have become active. For example, in the Standardization Society, a report from ITU-T (International Telecommunication Standardization Sector) in December 2007 (ICTs and Climate Change) was used as an opportunity to develop Energy Science. Committee recommendation g. 983.2, G.G. 984.4 defines a power saving process in the PON system. The IEEE, which is standardizing 10G-EPON, discusses the power saving function at the 802.3az working group and is working on the standardization of 10G-EPON. For this reason, the power saving function is being studied in parallel by developers of 10G-EPON systems and integrated circuits.

FIG. 6 shows an outline of a PON system, where 100 is a subscriber's house, 200 is a station, 300 is an optical coupler, 101 is an ONU (Optical Network Unit), 102 is a terminal such as a personal computer, and 201 is an OLT (Optical Line). Terminal). The ONU 101 of each subscriber home 100 and the OLT 201 of the station 200 are connected by an optical line via the optical coupler 300, and the OLT 200 communicates with each ONU 101 via the optical coupler 300 as described above. And a communication service at a transmission rate of 10 Gbps, and a connection service to the Internet. In such a PON system, power saving is being studied. For example, in the conventional ONU 101 on the subscriber side, the standby state is continued despite being in the no-communication state. Therefore, even if the power consumption in the communication state is less, it is continuously maintained. Electricity was consumed. Further, tens of millions or more of ONUs 101 are currently arranged and operated, and even if the power consumption per unit is small, the power consumption as a whole increases. Therefore, power saving is required, and various means have been proposed. For example, in a PON system including a plurality of subscriber units, that is, an ONU and an OLT as a center side unit connected by an optical line via an optical coupler, the power supply set to ONU correspondence from the OLT is turned on or off The ONU specified by the low frequency signal is transmitted by superimposing it on the main signal, and the ONU designated by the low frequency signal controls power on / off of an amplifier or the like that performs main signal processing, thereby saving power. Means for achieving this have been proposed (see, for example, Patent Document 1).

  Also, in a system that performs normal data transmission / reception by OLT using optical signals and receives optical video signals to display images, a set top box STB (Set Top Box) attached to a television receiver that displays images. Is turned on, a signal indicating that the power is turned on is sent to the power supply control unit via the AC 100V lamp wiring, and the power supply control unit receives the power on signal of the video optical subscriber line termination device. When the power supply is turned on to start the reception operation and the STB power is turned off, a signal indicating this power off is sent to the power control unit via the lamp wiring, and the power control unit is a video optical subscriber line terminator. Means for reducing the power consumption by turning off the power supply have been proposed (see, for example, Patent Document 2). A plurality of ONUs are connected via an OLT and an optical coupler, and each ONU is provided with a switch for connecting to a power supply unit corresponding to an optical interface unit, a PON processing unit, and a LANPHY processing unit as a plurality of functional units, and a power control unit The power supply control unit is controlled according to the communication status detected by the communication status detection unit, or the power control unit is controlled by a command from the OLT side. There has also been proposed a means for controlling the operation or stop of each part by controlling on / off of each switch according to the above, thereby achieving power saving (see, for example, Patent Document 3).

  In addition, in a data processing apparatus including an IEEE 1394 interface, a system power supply unit that supplies operating power to a main processor and the like, and a standby power supply unit that supplies power to each unit in the standby state, the operating power is supplied by the standby power supply unit. A means for reducing power consumption by analyzing the power control signal by the supplied sub-microcomputer and controlling whether the system power supply unit supplies operating power to the main processor or the like to shift to the operating state or to enter the standby state. Has also been proposed (see, for example, Patent Document 4). Also, the subscriber side device is set to ONT (Optical Network Terminal) (corresponding to the above-mentioned ONU) and includes the OLT of the station side device connected via an optical line and an optical coupler, and is used for address search in the ONT. The associative memory has a unicast address and a multicast address, and can control power supply individually. For example, when a subscriber has not received a specific frame for a certain period of time, There has also been proposed means for saving power by discarding frames before address search and stopping the power supply to the associative memory for the multicast address (see, for example, Patent Document 5).

Japanese Patent Laid-Open No. 7-154369 JP 2002-84535 A JP 2007-89027 A JP 2008-42428 A JP 2009-170986 A

  The number of subscribers of the PON system is very large as described above, and ONUs as a plurality of subscriber-side devices connected to the OLT as a station-side device via an optical coupler and an optical line. In general, the power supply state is continued even in the communication standby state, and as shown in the above-mentioned prior art document, by applying various power saving means, the system as a whole The power saving can be achieved. However, when the power saving technique of the above-mentioned Patent Document 1 is applied, since a low-frequency optical signal is superimposed on a high-speed transmission optical signal, the high-speed transmission optical signal is fluctuated. There are drawbacks, including problems that promote errors. In addition, the above-mentioned Patent Document 2 applies power line transfer technology to V-ONU for receiving moving image information in the ONU to control power on / off of the operating power of the V-ONU by transferring power control information. It is unsuitable for power control of each part in the same rack or device case. In addition, the above-mentioned Patent Document 3 is provided with a switch for controlling the supply and stop of the operation power supply corresponding to a plurality of functional units in the ONU to save power, and a relatively rough power supply control means is provided. It is only shown, and it is difficult to apply it to ONU power saving as it is. Further, the above-mentioned Patent Document 4 includes a system power supply and a standby power supply, and detects a power button operation and a remote control operation by a sub-microcomputer of the standby power supply, and monitors a communication status with an external device. The system power is turned on / off according to the result, and power saving is performed only for the system power, and power saving as a whole is not sufficient. Further, the above-mentioned Patent Document 5 shows that the power supply to the unicast associative memory and the multicast associative memory is controlled to be stopped or not, and there is a drawback that sufficient power saving cannot be expected as a whole.

  An object of the present invention is to improve the above-described problems of the conventional example, and to achieve further power saving by fine automatic control processing in the ONU corresponding to the communication situation.

The optical line subscriber side termination unit (ONU) of the present invention is connected to the subscriber's terminal via an interface unit, and is connected to the optical line station side termination unit via an optical coupler and an optical transmission line. In the optical line subscriber side termination unit (ONU), a storage unit that receives transmission data from the subscriber's terminal via the interface unit and temporarily stores it by control of the physical layer unit, Including a power supply control unit that controls supply and stop of operating power to each unit, and a PON control unit that controls communication between the subscriber's terminal and the optical network station side device, and the physical layer unit includes: Control means for switching between half-duplex and full-duplex by monitoring a communication state with the terminal connected via the interface unit based on a storage state of the storage unit, When the terminal starts communication, it is in a half-duplex communication state. In other words, when the remaining capacity of the storage unit for temporarily storing transmission data from the terminal decreases beyond a threshold, a collision signal is transmitted to the terminal, and the collision signal transmission exceeds the threshold number of times per unit time. When the communication with the terminal is switched to a full-duplex communication state, and when the remaining capacity of the storage unit in the full-duplex communication state exceeds a threshold, transmission to the terminal is suspended. And when the remaining capacity falls within a threshold, a control configuration is provided for switching communication with the terminal to a half-duplex communication state .

The optical line subscriber-side termination unit (ONU) of the present invention is connected to a subscriber's terminal via an interface unit, and between the optical line station-side termination unit via an optical coupler and an optical transmission line. In a connected optical line subscriber-side terminal unit (ONU), a storage unit that receives transmission data from the subscriber's terminal via the interface unit and temporarily stores it by control of a physical layer unit; A power supply control unit that controls supply and stop of operating power to each unit of the network, and a PON control unit that controls communication between the subscriber's terminal and the optical line station side device, and the physical layer unit includes: Monitoring the amount of information stored in the storage unit and an auto negotiation unit for notifying the terminal of switching between half-duplex communication and full-duplex communication with the terminal via the interface unit Receive information from the status monitoring unit Lifting and includes a physical layer host interface for transferring information from said state monitoring unit for performing the switching between the half-duplex communication and full-duplex communication with the automatically negotiates shaper Deployment unit.

In an optical line subscriber-side terminating device (ONU) in which a terminal and an optical line station-side terminating device (OLT) are connected via an optical coupler and an optical line, the terminal and the optical line station-side terminating device (OLT) The communication state is monitored, and in the communication stop state, the mode is shifted to the power saving mode. The power consumption of the data reception detection function is small compared to the power consumption of the entire device, and the PON As described above, the number of operating states of the optical line subscriber unit (ONU) to which the system is applied becomes enormous, so that the power saving effect of the entire system has the advantage of becoming a very big gate. .

It is explanatory drawing of Example 1 of this invention. It is a principal part sequence chart of the reference example 1 of this invention. It is a flowchart of Example 1 of this invention. It is principal part explanatory drawing of the remaining capacity monitoring means of the memory | storage part of Example 1 of this invention. It is principal part explanatory drawing of Example 2 of this invention. It is an outline explanatory view of a PON system.

An optical line subscriber-side termination unit (ONU) according to the present invention will be described with reference to FIG. 1. An optical coupler is connected to a subscriber's terminal via an interface unit and between the optical line station-side termination unit. Is an optical line subscriber-side terminator (ONU) connected via an optical transmission line and receives transmission data from a subscriber's terminal via an interface unit (user IF unit) 2 and a physical layer unit (PHY unit) The storage unit 4 temporarily stored by the control of the unit 3, the power source control unit 12 that controls the operating power for each unit in the apparatus, and the communication between the subscriber's terminal and the optical network station side terminating device Including a user IF unit 2, a PHY unit 3, and a PON control unit 5 between the terminal and the ONU. Switch the communication connection status with the By performing the signal in time it switched, and a control arrangement to achieve compared to power consumption for full-duplex communication.

Here, before describing Example 1, Reference Example 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a main part of the configuration of a PON system subscriber side, that is, an ONU, 1 is an ONU, 2 is a user IF unit (interface unit), 3 is a PHY (Physical Layer) unit, 4 is a storage unit, 5 is a PON control unit, 6 is a SERDES (serialization / deserialization) unit, 7 is a transmission / reception unit, 8 is a transmission unit including an electro-optic conversion unit, 9 is a reception unit including a photoelectric conversion unit, Reference numeral 10 denotes a multiplexing / demultiplexing unit that multiplexes and demultiplexes optical signals, 11 a power supply unit, 12 a power supply control unit, 13 a control system storage unit, and 14 a display function unit. And the control data transfer path, the dotted arrow path indicates the power supply path, the thick dotted path in the dotted arrow path indicates the trunk system supply path, and the thin dotted path indicates the distribution supply path The power supply unit 11 converts and supplies the operation voltage inside the apparatus based on power supplied from a commercial AC power supply (not shown). The power supply control unit 12 operates from the power supply unit 11. For example, power is always supplied to the PHY unit 3 and the storage unit 4, and common or selected for the other PON control unit 5, SERDES unit 6, the transmission / reception unit 7, the display function unit 14, and the like. For example, control is performed according to state information and control information from the PHY unit 3.

  Also, a subscriber terminal (not shown) is connected to the user IF unit 2 of the ONU 1, and an OLT is connected to the transmission / reception unit 7 via an optical fiber transmission line and an optical coupler (not shown) to control data transmission / reception. At the time of the data transmission / reception processing, operating power is supplied from the power supply unit 11 to each unit via the power supply control unit 12 by the thick dotted line route and the thin dotted line route, and the transmission data of the subscriber's terminal is It is converted into an optical signal and transmitted through the route of the user IF unit 2, the PHY unit 3, the storage unit 4, the PON control unit 5, the SERDES unit 6, and the transmission / reception unit 7. The transmission timing is controlled so that it does not collide with transmission signals from other ONUs. The optical signal received from the OLT via the optical coupler and the optical fiber transmission line by the reception unit 9 of the transmission / reception unit 7 of the ONU 1 is converted into an electrical signal, and the SERDES unit 6 and the PON control unit 5 perform the own MAC address or Only data specified by its own LLID (Logical Link Identifier) assigned from the OLT is received and processed, and transmitted to the subscriber's terminal via the PHY unit 3 and the user IF unit 2. The display function unit 14 has a function of displaying an operation state during data transmission / reception and an error occurrence. The control system storage unit 13 stores transmission timing information recognized by the PON control unit 5.

The storage unit 4 of the ONU 1 has a buffer function for temporarily holding transmission data from the subscriber side terminal via the user IF unit 2 and the PHY unit 3, and receiving from the OLT side. Although it is possible to provide a function for temporarily storing data and is not shown in the drawing, it includes a control function for writing and reading data and a monitoring function for the storage amount. When it is detected whether or not the amount exceeds a predetermined threshold value, or even zero, and when the amount of storage exceeds the threshold value, the power control unit 12 is notified. The storage unit 4 can be applied to various storage configurations such as FIFO, shift register, RAM, etc., and the storage data amount monitoring function includes, for example, a head address where transmission data is written, an address being written, Based on the difference, a method for determining whether or not the stored data amount exceeds a predetermined threshold can be applied. Also, as the threshold value in this case, the data transfer rate from the transmission portion 8 of the transceiver unit 7, and the transmission repetition period, including the total storage capacity of the storage unit 4, the storage unit 4 over over flow to start transmission It is desirable to set a value that does not, and it is set in advance in consideration of the system operation status. In response to the notification that the transmission data is temporarily stored in the storage unit 4 and exceeds the threshold, the power supply control unit 12 causes the PON control unit 5, the SERDES unit 6, the transmission / reception unit 7, the control system storage unit 13, and the display function. The operation power supply to the unit 14 is started. Thereby, the PON control unit 5 starts transmission processing of transmission data stored in the storage unit 4. When starting this transmission processing, a transmission timing assignment request is made to the OLT, and transmission is started at the transmission timing by receiving transmission timing assignment from the OLT. In this case, the data of the storage amount of the storage unit 4 is transferred to the power supply control unit 12, and the power supply control unit 12 determines whether or not the storage amount exceeds the threshold value. It is possible to adopt a control configuration in which data transmission is started by supplying power to each unit.

  Also, the end of data transmission from the subscriber's terminal, for example, ends transmission of all transmission data temporarily stored in the storage unit 4, the stored data amount becomes zero, and the transmission allocation timing elapses. When such a state continues for a predetermined period, the transmission end notification can be sent to the power supply control unit 12 by the storage amount monitoring function of the storage unit 4. Alternatively, the power supply control unit 12 may make a determination based on the storage amount information from the storage unit 4. As described above, the power supply control unit 12 shifts to the power saving mode when the transmission is finished. In this power saving mode, the user IF unit 2, the PHY unit 3, and the storage unit 4 are controlled. The operating power is supplied, and the supply of the operating power to the other functional parts is stopped. Since the transmission / reception unit 7 is in a non-operating state due to the shift to the power saving mode, the data reception processing from the OLT side continues to be stopped. It is also possible to supply the operating power directly from the power supply unit 11 to the PHY unit 3 and the storage unit 4, for example, in a configuration that always maintains the operation state without going through the power supply control unit 12.

FIG. 2 shows a main part sequence chart of Reference Example 1 of the present invention, and shows a transmission / reception sequence among the terminal PC, the ONU, and the OLT. Hereinafter, description will be made with reference to FIG. 1 as necessary. When the communication from the state during communication between the terminal PC and the ONU is completed, the power control unit 12 of the ONU 1 starts timing according to the notification from the PHY unit 3, and the elapse of a preset time T To shift to the power saving mode. That is, based on information from the PHY unit 3, the power supply control unit 12 supplies operating power only to the PHY unit 3 including the storage unit 4, for example, stops supplying operating power to other parts, and saves power. Migrate to In this case, data from the OLT, that is, downlink data is discarded. When uplink data resulting from the start of communication from the terminal PC is temporarily stored in the storage unit 4 of the PHY unit 3 via the user IF unit 2, the PHY unit 3 detects this and starts data transmission to the power supply control unit 12 To be notified. Thereby, the communication shown in the figure is started. That is, operating power is supplied from the power supply control unit 12 to each unit in the ONU, and received data from the terminal PC is transmitted from the storage unit 4 to the PON control unit 5, the SERDES unit 6, the transmission unit 8 of the transmission / reception unit 7, and multiplexing / demultiplexing. Transmission to the OLT is started at the timing instructed by the OLT via the unit 10, and communication is in progress.

  At the end of this communication, for example, the end of communication in which all the data in the storage unit 4 has been transmitted, the PHY unit 3 starts timing and monitors whether the set time T has elapsed. If communication is started before the set time T elapses, the operating power is supplied to each unit in the ONU via the power supply control unit 12. Therefore, data from the terminal PC is stored in the storage unit 4. The communication is in progress for transmission to the OLT side. When this communication is completed, as described above, the PHY unit 3 starts timing, monitors whether the set time T has elapsed, and when the set time T elapses, the power supply control unit 12 changes to the PON control unit 5 and the SERDES unit 6. Then, the operation power supply to the transmission / reception unit 7 is stopped, and the mode is shifted to the power saving mode.

Based on the above, the first embodiment of the present invention will be described next with reference to FIGS. FIG. 3 shows a flowchart of the first embodiment of the present invention, which shows communication control between the ONU and the terminal, and will be described with reference to FIG. With the configuration including the user IF unit 2, the PHY unit 3, and the PON control unit 5 between the terminal and the ONU, communication between the terminal (not shown in FIG. 1) can be performed in half duplex and full mode. By switching the communication connection state with duplex, half-duplex communication can save power compared to full-duplex communication by switching transmission and reception in time. When there is no communication (1), the ONU and the terminal continue a half-duplex connection state for performing half-duplex communication (2). When the terminal starts communication, the data is temporarily stored in the storage unit 4 of the PHY unit 3 via the user IF unit 2 and transfer control is performed. The storage amount is monitored and it is determined whether or not it is within the threshold value. (3). If it is within the threshold, the half-duplex connection state of step (2) is continued, and if the threshold is exceeded, a collision signal is sent to the terminal (4). The number of collision signal transmissions within the unit time is monitored (5). If the number of collision signals is within the threshold, the process proceeds to step (1) to continue the half-duplex communication state. Switch to connected state (6). Even when the full-duplex connection state is entered, the remaining capacity monitoring in the storage unit 4 is continued (7), and when the threshold value is exceeded, a PAUSE frame is sent to the terminal so that the storage unit 4 does not overflow. (8) Suspend terminal transmission. If the remaining capacity is within the threshold value, the process proceeds to step (2) to shift to the half-duplex connection state. In this case, the threshold values in step (2) and step (7) can be different values.

  FIG. 4 is an explanatory view of the main part of the above-mentioned remaining capacity monitoring means of the storage unit, 21 is a memory, 22 is a decoder, 23 is an input / output circuit, 24 is a control circuit, and this control circuit 24 is a control bus. The decoder 22 and the input / output unit 23 are controlled in accordance with the data write and read control information via the, and the address transferred via the address bus is decoded by the decoder 22 into a column address and a row address. Data is written to or read from the input / output circuit 23 to the memory cell specified by the address and the row address. Note that although a configuration of read / write control corresponding to a memory cell is shown, a configuration in which parallel writing or parallel reading with respect to a plurality of memory cells is also possible. In addition, when writing data to the memory 21 in order from the top address, the control circuit 24 can monitor the remaining capacity by the storage capacity of the memory 21 and the threshold value for avoiding overflow by the final access address. When the remaining capacity exceeds the threshold value, the control processing function of the PON control unit 5 or PHY unit 3 shown in FIG. 1 causes collision signal transmission (4) to the terminal and PAUSE frame transmission control to the terminal in FIG. It can be performed.

FIG. 5 is an explanatory diagram of a main part of the second embodiment of the present invention, showing the user IF unit 2, the PHY unit 3, and a part of the PON control unit 5 in FIG. The case of the structure connected between the part 3 and the PON control part 5 is shown. The storage unit 4 can also be provided in the PHY unit 3 as in FIG. 1, and the path for transferring data to the storage unit 4 via the user IF unit 2 and the data from the storage unit 4 Is not shown in the figure for the path through which the data is transferred via the PON control unit 5. Also, 31 is a DA conversion unit, 32 is an auto negotiation unit, 33 is an MII (Media Independent Interface) register unit, 34 is an MII control unit, 35 is a state monitoring unit, and 36 is an MII control unit. . The PHY unit 3 includes a configuration including a DA conversion unit 31, an auto negotiation unit 32, an MII register unit 33, and an MII control unit 34, and the PON control unit 5 includes a state monitoring unit 35 that monitors the storage unit 4, A configuration including an MII control unit 36 for communication with the PHY unit 3 is provided. The second embodiment has a control configuration in which the communication between the terminal and the ONU in the first embodiment is switched between full-duplex communication and half-duplex communication. It is intended to save power by using low power consumption during communication.

  Communication between the terminal (not shown) and the user IF unit 2 is started in a half-duplex connection state, and data from the terminal is temporarily stored in the storage unit 4 via the user IF unit 2 and the PHY unit 3. The The amount of data stored in the storage unit 4 is monitored by the state monitoring unit 35 of the PON control unit 5, and if the amount of stored data exceeds the threshold, the MII control unit 36 notifies the MII unit 34 of the PHY unit 3 that the threshold has been exceeded. To do. The MII control unit 34 of the PHY unit 3 notifies the auto negotiation unit 32 via the MII register unit 33 and sends a collision signal from the DA conversion unit 31 to the terminal via the user IF unit 2. When the number of times the collision signal is transmitted within a unit time exceeds the threshold, the auto-negotiation unit 32 notifies the terminal via the user IF unit 2 of a shift to full-duplex communication. Thereby, the half-duplex communication is switched to the full-duplex communication between the terminal and the ONU. Then, when the state monitoring unit 35 of the PON control unit 5 continues to monitor the accumulated data amount in the storage unit 4 and the remaining storage capacity of the storage unit 4 exceeds the threshold value, the MII control unit 36 to the MII control unit 34 of the PHY unit 3. The MII control unit 34 notifies the auto negotiation unit 32 via the MII register unit 33, and the auto negotiation unit 32 performs transmission control of the PAUSE frame to the terminal via the user IF unit 2. When the remaining storage capacity of the storage unit 4 falls within the threshold value, the MII control unit 36 notifies the MII control unit 34 of the PHY unit 3 and controls the auto-negotiation unit 32 to perform the full duplex communication. Sends instructions to change to half-duplex communication. Thereby, when the amount of transmission data is small, it is possible to shift to half-duplex communication to save power.

1 ONU
2 User IF unit 3 PHY unit 4 Storage unit 5 PON control unit 6 SERDES unit 7 Transmission / reception unit 8 Transmitting unit including electro-optic conversion unit 9 Receiving unit including photoelectric conversion unit 10 Multiplexing / demultiplexing unit 11 Power source unit 12 Power source control unit 13 Control System storage unit 14 Display function unit

Claims (2)

In an optical line subscriber-side terminating device that is connected to a subscriber's terminal via an interface unit and is connected between an optical line station-side terminating device via an optical coupler and an optical transmission line,
A storage unit that receives transmission data from the subscriber's terminal via the interface unit and temporarily stores it by control of the physical layer unit, and a power supply control unit that controls supply and stop of operating power to each unit in the apparatus And a PON control unit that controls communication between the subscriber's terminal and the optical network station side termination device,
The physical layer unit includes a control unit that monitors a communication state with the terminal connected via the interface unit based on a storage state of the storage unit and switches between half duplex and full duplex. The control means switches to a half-duplex communication state at the start of communication of the terminal, and when the remaining capacity of the storage unit for temporarily storing transmission data from the terminal decreases beyond a threshold, the terminal When the collision signal transmission exceeds a threshold number of times per unit time, the communication with the terminal is switched to a full-duplex communication state, and the collision signal is transmitted in the full-duplex communication state. When the remaining capacity of the storage unit exceeds the threshold, the terminal is requested to pause transmission, and when the remaining capacity falls within the threshold, the communication with the terminal is switched to the half-duplex communication state. optical line subscriber end, characterized in that a control arrangement Apparatus. In an optical line subscriber-side terminating device that is connected to a subscriber's terminal via an interface unit and is connected between an optical line station-side terminating device via an optical coupler and an optical transmission line,
A storage unit that receives transmission data from the subscriber's terminal via the interface unit and temporarily stores it by control of the physical layer unit, and a power supply control unit that controls supply and stop of operating power to each unit in the apparatus And a PON control unit that controls communication between the subscriber's terminal and the optical network station side termination device,
The physical layer unit is configured to notify the terminal of switching between half-duplex communication and full-duplex communication with the terminal via the interface unit, and storage in the storage unit. Receives and holds information from the state monitoring unit that monitors the amount of information, and transfers information from the state monitoring unit for switching between the half-duplex communication and the full-duplex communication to the auto-negotiation unit 2. The optical line subscriber-side terminal device according to claim 1, further comprising a physical layer upper interface unit.

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