JP4884819B2 - PON system and automatic download method - Google Patents

Description

  The present invention relates to a PON (Passive Optical Network) system having a configuration in which a plurality of subscriber-side terminators are connected in a star shape via an optical fiber transmission line via a terminal device and an optical splitter, and an automatic download method.

  The PON system is an optical fiber transmission line between an end station device (OLT: Optical Line Terminate) in a building and a plurality of terminal devices (ONU: Optical Network Unit) in a user's home via an optical splitter (or optical coupler). A configuration is known in which the optical splitter performs 16-branch combining or 32-branch combining of optical signals. The terminal unit (ONU) of each user is time-division multiplexed by transmitting data with a time difference according to the information of the transmission start time and the transmission permission time notified from the terminal unit (OLT). Are combined and transmitted to the terminal station (OLT). Data for each terminal unit (ONU) is transmitted in a multiplexed state with the data added with the address of each terminal unit, distributed by an optical splitter, and transmitted to each terminal unit. Each terminal unit (ONU) receives and processes data to which its own address is added.

  The terminal unit (ONU) in the user's home needs to update the installed firmware for reasons such as carrier service change, new service, device function enhancement, hardware revision, defect correction, and the like. In this case, conventionally, the firmware of the terminating device (ONU) to be downloaded is first transferred to the terminal device (OLT) by, for example, FTP (File Transfer Protocol), and then the terminal device (OLT). ) In the control package storage area. Then, the administrator inputs a download command in order to deploy the saved firmware to the end device (ONU). At that time, the administrator designates the communication package number and the termination unit (ONU) number in which the download target termination unit (ONU) is accommodated, and executes the download command. When the download of the firmware to the designated end unit (ONU) is completed, a reboot is required to operate the end unit (ONU) with the new firmware. By performing this reboot, the firmware stored in the standby surface of the terminating device (ONU) is copied to the operating surface so that it can be operated with the new firmware. The terminating device (OLT) After downloading to the ONU), automatic termination by the terminal station device (OLT) or remote reboot by the administrator is performed to operate the termination device (ONU) with new firmware.

  In addition, a software server for automatically downloading software, a software group to be transmitted to the terminal device is held, a system search program is transmitted in advance from the communication server to the terminal device, and based on the system search result from the terminal device, There has been proposed a method of selecting communication software optimum for a terminal device and downloading the communication software from a communication server to a communication terminal (see, for example, Patent Document 1).

  Also, when a module with built-in firmware is replaced, it is determined whether the version stored in the memory of the device matches the version of the firmware attached to the new module. A method has been proposed in which a controller automatically downloads software of the version of firmware held in a memory to a new module (see, for example, Patent Document 2).

In addition, it is applicable to the ADSL (Asymmetric Digital Subscriber Line) method, and a setting memory for holding setting data for communicating with a lower level device is provided in an interface unit connected to a plurality of lower level devices corresponding to subscribers. The upper common part of the interface part is equipped with a backup memory, and a setting table corresponding to the setting memory of the interface part is provided in the backup memory. The setting data is transferred to the setting memory of the new interface unit, and when the version is upgraded, the setting data of the upgraded unit is controlled to be stored in the setting table of the common unit. To transfer and set up Are (e.g., see Patent Document 3).
JP-A-8-263409 JP 2005-71042 A JP 2005-347913 A

  Firmware download in the conventional PON system is executed by the CLI (command line interface) command by the administrator, and is performed by the CLI command for each terminal unit (ONU). If there are more than tens of thousands of terminal units (ONUs), it will be downloaded every time the version number is changed, but it will be operated by the administrator one by one, the amount of work will be enormous, and the work time will be There was a problem of becoming longer.

  It is also necessary to check the version of the firmware of the end unit (ONU) to determine whether or not to download, and the power of the end unit (ONU) of all subscribers is not always turned on. In addition, since there are cases where the optical fiber transmission system is not normal, the administrator needs to repeatedly perform a download operation for the terminating device (ONU) that is not operating normally. Also, if the power to the termination unit (ONU) or the disconnection of the optical fiber occurs during the download, it is necessary to perform the download operation from the beginning again. In addition, after downloading and rebooting, in order to confirm whether the firmware is normal, the administrator reads the firmware from the terminal unit (ONU) to confirm, and if not normal, performs the download operation again. There is a need. Therefore, there is a problem that the burden on the administrator side is large.

  In addition, after downloading, it is necessary to reboot the end unit (ONU). For this purpose, the administrator performs a remote reboot or an automatic reboot of the end unit (ONU). ) During communication such as receiving an image via an IP phone or the Internet via the Internet, there is a problem that forced disconnection occurs due to reboot execution, resulting in a significant decrease in service. Also, when downloading firmware while ignoring the bandwidth in use between the terminal equipment (OLT) and each terminal equipment (ONU), the bandwidth used by the subscriber is compressed and the service is degraded. There is.

In the ADSL system, the modem firmware may be downloaded by the subscriber by accessing the site, but all subscribers can download it. Since it is not limited, it is not possible to execute all firmware upgrades and there is a problem of erroneous operation by the subscriber. Although a means for automatically accessing the server from a modem and downloading it can be considered, adding an automatic download function to all modems has a problem of increasing the cost of the modem. Further, although the above-mentioned Patent Documents 1 to 3 relate to a communication system, there is no disclosure about the above-mentioned problem in the PON system and the means for solving it.

  The present invention solves the above-mentioned conventional problems, and reduces the work burden on the administrator and makes it possible to avoid a decrease in service to subscribers.

The PON system of the present invention is a PON system in which a plurality of termination devices are connected to a terminal device via an optical splitter via an optical fiber transmission line , the terminal device includes a PON interface board compatible with the optical splitter, A supervisory control board for controlling the PON interface board, the supervisory control board comprising: a management table for managing the plurality of termination devices connected to the PON interface board via the optical splitter; and the plurality of terminations An automatic download table for registering a terminal device having a different version number of the operating firmware of the device and a firmware version to be downloaded as a download target terminal device, and firmware for the download target terminal device registered in the automatic download table execution means and, the execution hand to perform the download of Determining means for determining whether or not the download by means of normal termination, means for deleting the download target terminal device determined to be normal completion by the determination means from the automatic download table, and the download that cannot be normally terminated by the determination means A step of increasing the number of downloads corresponding to the target terminal device, and means for deleting the download target terminal device for which the number of downloads has exceeded a set value from the automatic download table, the terminal device from the terminal device Means for holding the downloaded firmware on the standby surface, copying the firmware held on the standby surface to the operating surface by rebooting, and updating the firmware.

In addition, the monitoring control panel of the terminal station device automatically sets the terminal device having a different version number of the firmware being downloaded and the version of the firmware to be downloaded as the download target terminal device at the download start set time or the connection authentication of the terminal device. Means for registering in the download table and downloading firmware to the download target terminal device, means for deleting the download target terminal device from which the firmware download has been completed normally from the automatic download table, and download cannot be completed normally A step of increasing the number of downloads corresponding to the download target terminal device, and deleting the download target terminal device from the automatic download table when the download number exceeds a set value.

  The monitoring control board of the terminal station device obtains the traffic amount for the download target terminal device before starting the download of the firmware for the download target terminal device, and starts the download only when the firmware can be downloaded. It has.

  In addition, the termination device is configured to display the reboot request by holding the firmware downloaded from the terminal device on the standby surface, and from the standby surface to the active surface by reboot based on the reboot request display of the display device. Means for copying the firmware.

  According to another aspect of the present invention, there is provided an automatic download method in which a plurality of terminal devices are connected to a terminal device via an optical splitter, and firmware is downloaded from the terminal device to the terminal device. Comparing the version number of the firmware to be downloaded with the version number of the operating firmware of the terminal device, registering a terminal device having a different version number as a terminal device to be downloaded in the automatic download table, and the automatic download This includes a process of sequentially downloading firmware to the download target terminal device registered in the table and a process of deleting the normal download terminal device from the automatic download table.

Also, when the download start time is set or when the connection of the terminal device is authenticated, a terminal device having a different version number of the firmware in operation of the terminal device and the firmware version to be downloaded is registered in the automatic download table as a terminal device to be downloaded. The process of sequentially downloading firmware to the download target collection device registered in the automatic download table, and the download target terminal device that has been successfully downloaded is deleted from the automatic download table, and the download is normally completed. A step of increasing the number of downloads corresponding to the download target terminal device that cannot be performed, and deleting the download target terminal device whose download number exceeds a set value from the automatic download table.

  Before the download of the firmware to the download target terminal device is started, the amount of traffic to the download target terminal device is obtained, it is determined whether the firmware can be downloaded, and the firmware download is started only when it is possible. Including processes.

  The terminal device having the firmware downloaded from the terminal device temporarily holds the firmware on the standby surface, displays a reboot request, and reboots based on the reboot request display from the standby surface to the active surface. A process of copying the firmware and updating the firmware.

  When downloading firmware from a terminal device to a terminal device, terminal devices with different firmware versions are sequentially extracted as download target terminal devices, registered in the automatic download table, and the firmware is downloaded based on the automatic download table. Therefore, the workload of the administrator is greatly reduced, and the firmware can be downloaded automatically. Also, new firmware can be created without interfering with normal data transmission by performing registration processing and download processing to the automatic download table at the set time or connection authentication, and downloading when there is a vacant transmission band. Can be automatically downloaded. After the download, the reboot request display informs the subscriber that the firmware has been downloaded, and it is possible to perform the rebooting at the convenience of the subscriber, thereby eliminating problems such as service interruption.

  Referring to FIG. 1, the PON system of the present invention is a PON system in which a plurality of terminal units (ONUs) 2 are connected to a terminal unit (OLT) 1 via an optical splitter 3. 1 includes a PON interface board compatible with an optical splitter and a supervisory control board that controls the PON interface board. The supervisory control board is connected to the PON interface board via an optical splitter 3. Management table 10a for managing 2 and an automatic download table for registering a termination device (ONU) 2 in which the version number of the operating firmware of the termination unit (ONU) 2 is different from the version number of the firmware to be downloaded as a download target termination device 10b and the download target terminal device registered in the automatic download table 10b. The terminal unit (ONU) 2 holds the firmware downloaded from the terminal unit (OLT) 1 on the standby surface, and the firmware on the standby surface is made active by rebooting. It has means for copying and updating the firmware.

  In the automatic download method of the present invention, a plurality of terminal units (ONU) 2 are connected to the terminal device (OLT) 1 via an optical splitter, and firmware is transferred from the terminal device (OLT) 1 to the terminal device (ONU) 2. In the automatic download method for downloading, the terminal station (OLT) 1 compares the version number of the firmware to be downloaded with the version number of the firmware in operation of the terminal unit (ONU) 2, and the version numbers are different. A process of registering the termination unit (ONU) 2 as a download target termination unit in the automatic download table, a process of sequentially downloading firmware to the download target termination unit registered in the automatic download table, and a download normal termination termination unit, And deleting from the automatic download table.

  FIG. 1 is an explanatory diagram of a PON system according to a first embodiment of the present invention, in which 1 is a terminal device in a station (hereinafter abbreviated as OLT) and 2 is a subscriber-side terminal device (hereinafter abbreviated as ONU). ) 3 is an optical splitter (sometimes referred to as an optical coupler), 4 is a CLI (Command Line Interface) terminal, 5 is a RADIUS (Remote Authentication Dial-In User Service) server, 6 is an upper network, and 7 is an MNG (Manager). ) System, 8 is a DCN (Data Communication Network), 9 is a user terminal, 10a is a management table, and 10b is an automatic download table.

  The UNI (User Network Interface) is an interface between the user terminal 9 and the ONU 2, the PON-IF is an interface on the optical splitter 3 side, the apparatus setting IF is an interface between the OLT 1 and the CLI terminal 4, AAA-IF (Authentication, Authorization and Accounting Interface) is an interface between the OLT 1 and the RADIUS server 5, CNI (Core Network Interface) is an interface between the OLT 1 and the upper network 6, and MNG-IF is an MNG system 7 and a DCN 8. And the interface between DCN8 and OLT1.

  The OLT 1 has a configuration including a single or a plurality of communication packages and a single supervisory control package. The communication package is connected to the upper network 6 via the CNI and is optically connected via the PON-IF. The splitter 3 is connected to the optical fiber transmission line. The optical splitter 3 has a configuration for combining optical signals into 16 branches or 32 branches, and in order to perform mutual communication by optical signals between the OLT 1 and 16 or 32 ONUs 2, the OLT 1 is connected to each ONU 2. And the optical signals from each ONU 2 are combined in a time division manner and transmitted to the OLT 1. If, for example, 16 communication packages are mounted on the OLT 1 and connected to 32 ONUs 2 via the optical splitter 3 by one communication package, a maximum of 512 ONUs 2 can be accommodated by the OLT 1. .

  The management table 10a is a table for managing the address of the ONU 2 under the OLT 1 and the automatic download table 10b is the version number of the operating firmware and the version number of the firmware to be downloaded when the firmware is downloaded. Is a table for registering ONUs 2 having different numbers as ONUs to be downloaded. The administrator operates the CLI terminal 4 to control and manage the setting of the OLT 1. When the ONU 2 firmware needs to be updated, the firmware to be updated is input by a command from the CLI terminal 4. The data is stored in the memory of the control package of the OLT 1, and the download time, the download count, and the firmware name (including the version number) are set. As the download setting time, it is possible to select a time zone with a small traffic volume such as midnight.

  When the set download time is reached, the OLT 1 refers to the management table 10a and reads the operating firmware version number from the ONUs 2 connected to the respective communication packages. The read firmware version number and the firmware version number to be downloaded are compared, and if they are different, they are registered in the automatic download table 10b as automatic download target ONUs. The items to be registered include the number of the ONU 2 managed by the OLT 1, the version number of the firmware currently operating on the ONU 2, and the number of downloads (initial value is 0).

  The creation process of the automatic download table 10b in which the download target ONUs are registered is completed based on the result of the comparison process between the firmware version number in operation for all ONUs 2 and the firmware version number to be downloaded. Next, the first registered ONU is selected according to the order registered in the automatic download table 10b, and the traffic volume between the ONU and the OLT 1 is checked. If there is enough free space in the ONU direction transmission band, download is started. If there is not enough space in the transmission band, the number of downloads in the automatic download table 10b is incremented by one (+1) and re-registered so that the registration order is later. When the number of downloads exceeds a preset number, the ONU is deleted from the automatic download list, and the number of download retries is limited.

  When the download is completed normally, the ONU is deleted from the automatic download table 10b, and the download process for the next registered ONU is started. If the download fails, the number of downloads in the automatic download table 10b is incremented by one (+1) and re-registered. If the number of downloads exceeds a preset number, it is determined that the current download is difficult, Delete from the download table 10b. When the number of ONUs to be downloaded in the automatic download table 10b becomes 0, the automatic download process ends.

  Further, the automatic download process is executed not only when the download time is set but also when OUN2 is authenticated for connection. If a plurality of ONUs are authenticated for connection, for example, the above-described automatic download process is started in accordance with the authentication order. In this case, only the connection-authenticated ONU is read and compared to determine whether it corresponds to the download target ONU, and the ONU with a different version number is set as the download target ONU and the automatic download table. 10b and sequentially determines whether the firmware can be downloaded. If it is possible, the download is executed. Therefore, even if the ONU is before connection authentication or in a power-off state at the download setting time, it is possible to start the process of automatically downloading new firmware at the time of connection authentication. Thereby, for example, even when an ONU in a factory shipment state is connected by a new subscription, the latest firmware can be automatically downloaded to the ONU at the time of connection authentication.

  The ONU that has completed downloading of firmware, for example, causes a semiconductor light emitting element (LED) such as red to emit light to display a reboot request. As a result, at the convenience of the subscriber, a reboot operation can be performed, or downloading for firmware update is performed by e-mail, etc., notification is made to update by reboot, and ONU is displayed according to the reboot request display informing the download completion By rebooting, the update of the new firmware is completed.

  FIG. 2 is an explanatory diagram of the terminal device according to the first embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same parts, 11 is a PON interface board (PIF), 12 is a supervisory control board (SV), 13 Is a power panel (PWR), 14 is a PON interface unit (PON I / F), 15 is a PON processing unit, 16 is an interface unit (Giga I / F) for transmission speed of Gbps with the network 6, and 17 is serial. An interface unit, 18 is a memory, 19 is a control unit, and 20 and 21 are LAN interface units (LAN I / F).

  The PON interface board 11 corresponds to the above-described communication package, and a plurality of PON interface boards 11 are mounted for the optical splitter 3. The PON control unit 15 is connected to the optical splitter 3 through the PON interface unit 14 and is connected to the network 6 through the interface unit 16. The monitoring control panel 12 corresponds to the above-described monitoring control package, and has a configuration including a memory 18, a control unit 19, a serial interface unit 17, and LAN interface units 20 and 21. In addition, the power supply panel 13 includes a power supply unit that supplies operating power to each unit, and has a redundant configuration for current use. In addition, the memory 18 can have an area for storing the firmware to be downloaded, an area for the management table 10a, and an area for the automatic download table 10b.

  FIG. 3 is an explanatory diagram of the termination device according to the first embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same parts, 31 is a control unit, 32 is a memory, 33 is a PON processing unit, and 34 is a display unit ( LED), 35 is a PON interface unit (PON I / F) connected to the optical splitter 3, 36 is an interface unit (I / F) connecting the user terminal 9, 37 is a power supply unit, and 38 is an AC adapter. The AC adapter 38 converts, for example, AC 100V into a voltage used internally and supplies it to the power supply unit 37. The power supply unit 37 outputs a DC stabilizing voltage used internally.

  The memory 32 includes a standby surface that temporarily stores the downloaded firmware and an operation surface that stores the current firmware. Under the control of the control unit 31, the firmware downloaded from the OLT is stored in the standby surface of the memory 32. Temporarily store it, and by rebooting, copy the firmware on the standby side to the active side and update the firmware. In this case, when the firmware download is completed, a reboot request is displayed on the display unit 34 made of a light emitting diode or the like, and the user is prompted to reboot because new firmware has been downloaded.

  Data from the user terminal 9 is held in the buffer memory of the PON processing unit 33, and transmission of the data held in the buffer memory as an optical signal is started in accordance with the transmission start time and the transmission permission time instructed from the OLT. A data amount corresponding to the permitted time is transmitted. Further, the optical signal received from the OLT via the optical splitter 3 is converted into an electric signal, and the data for which the self ONU address is recognized is received and transmitted to the user terminal 9.

  FIG. 4 shows an example of a management table corresponding to the PON interface board. The ONU number (ONU01 to ONU32), the MAC address (MACaddress), the firmware version number (version), and the PON interface board numbers PIF01 to PIFn are supported. Is stored. An ONU with an ONU number without a MAC address corresponds to an unconnected ONU. This management table corresponds to the management table 10a of the OLT 1 in FIG. 1, and can be formed in the memory 18 of the monitoring control panel 12 in FIG.

  FIG. 5 shows an example of an automatic download table. As described above, when the set time or connection authentication is performed, the version number of the operating firmware of the ONU is read, and the ONU that does not match the firmware version to be downloaded is It is registered as the download target ONU, and the ONU number of the download target ONU, the version number (actual) of the operating firmware of the ONU, and the version number of the firmware to be downloaded (DL version) according to the version number comparison order in the ONU column And a column for the number of downloads (count). This download count has an initial value of 0.

  This automatic download table is shown as 10b in FIG. 1 and can be formed, for example, in the memory 18 in FIG. 2. For all ONUs managed by the monitoring control panel 12 of the OLT 1, It is created by automatically comparing the version numbers under the control of the control unit 19. In the automatic download table in the state shown in FIG. 5, for example, the ONU 10 with the ONU number has an operating firmware version number of 0001, the number of downloads is 0, and the ONU number ONU 23 has an operating firmware version number. Indicates 0002 and the number of downloads is 2. In other words, an ONU having a version number of the operating firmware that is different from the version number (LDversion) 0004 of the firmware to be downloaded is registered as the download target ONU.

  FIG. 6 is a flowchart of the first embodiment of the present invention. In the OLT, when the firmware download setting time comes under the control of the control unit 19 (see FIG. 2) (S1), or a new ONU is updated. When connection authentication is performed by connecting or powering on (S2), the version number of the operating firmware of the connection-authenticated ONU registered in the management table (see FIG. 4) is read (S3). Then, it is compared with the version number of the firmware to be downloaded (DL version in FIG. 5) set in the monitoring control board (SV board) 12 to determine whether or not they match (S4). If they match, there is no need for downloading, so this process ends.

  If they do not match, they are registered in the automatic download table (see FIG. 5) as download target ONUs (S5). When the automatic download table is configured by reading and comparing the firmware version numbers for all ONUs, the oldest on the automatic download table, that is, the registered ONUs are selected in order from the registered top ( S6). Then, the downstream traffic amount in the PON section of the selected download target ONU is checked. This process can be performed under the control of the control unit 19 of the monitoring control panel 12 of the OLT. Then, it is determined whether or not there is a bandwidth available for downloading the firmware (S7).

  If there is an available bandwidth, the firmware for the download target ONU is downloaded (S8). The ONU is stored, for example, in the firmware standby surface of the memory 32 (see FIG. 3) (S9). If there is no available bandwidth, the number of downloads of the corresponding ONU in the automatic download table is incremented by one (+1) and re-registered. When the number of download times exceeds a preset number, the download target ONU registered in the automatic download table is deleted (S13), and the process proceeds to step (S6). The firmware is downloaded and stored in the firmware standby surface of the corresponding ONU (S9).

  Then, it is determined whether or not the download has been completed normally (S10). If the download ends normally, the ONU is deleted from the automatic download table (S11). Then, it is determined whether or not the download target ONU remains in the automatic download table (S12), and if it does not remain, the process ends. If it remains, the process proceeds to step (S6), and the above steps (S6) to (S13) are executed. Therefore, it is possible to reduce the enormous work of the administrator that occurs when updating the firmware, and rebooting after downloading can be performed at a time convenient for the user, so that the influence on the service received by the user is minimized. Can be suppressed.

It is explanatory drawing of the PON system of Example 1 of this invention. It is explanatory drawing of the terminal station apparatus of Example 1 of this invention. It is explanatory drawing of the termination | terminus apparatus of Example 1 of this invention. It is explanatory drawing of a management table. It is explanatory drawing of an automatic download list. It is a flowchart of Example 1 of this invention.

Explanation of symbols

1 Terminal equipment (OLT)
2 Terminal unit (ONU)
3 Optical splitter 4 CLI (Command Line Interface) terminal 5 RADIUS (Remote Authentication Dial-In User Service) server 6 Higher network 7 MNG (Manager) system 8 DCN (Data Communication Network)
9 User terminal 10a Management table 10b Automatic download table 11 PON interface board (PIF)
12 Monitoring control panel (SV)
13 Power panel (PWR)
14 PON interface part (PON I / F)
15 PON processing unit 16 Interface unit (Giga I / F)
17 Serial Interface Unit 18 Memory 19 Control Unit 20, 21 LAN Interface Unit (LAN I / F)

Claims (6)

In a PON system in which a plurality of termination devices are connected to a terminal device via an optical splitter via an optical fiber transmission line ,
The terminal device includes a PON interface board compatible with the optical splitter and a supervisory control board for controlling the PON interface board, and the supervisory control board is connected to the PON interface board via the optical splitter. and automatic download table for registering the management table for managing a plurality of terminating devices, the version number is different from the terminating device firmware version number and firmware download in operation of said plurality of terminating devices as a download target termination device, Execution means for executing firmware download to the download target terminal device registered in the automatic download table, determination means for determining whether or not the download by the execution means has been normally completed, and normal termination by the determination means The download target termination device determined as Deleting the automatic download table from the automatic download table, and increasing the number of downloads corresponding to the download target terminal device that cannot be normally terminated by the determining unit, and the download target terminal device whose download number exceeds a set value is the automatic download table And means for deleting from
The terminating device has means for holding firmware downloaded from the terminal device on a standby surface, copying the firmware held on the standby surface to a working surface by rebooting, and updating the firmware. Characteristic PON system. The monitoring control panel of the terminal device obtains the traffic volume for the download target terminal device before starting the download of the firmware for the download target terminal device, and determines whether the firmware can be downloaded in view of the traffic amount. 2. The PON system according to claim 1 , further comprising: a determination unit; and a unit that starts downloading the firmware only when it is determined that the download is possible . The terminal device is configured to display the reboot request display by holding the firmware downloaded from the terminal device on the standby surface, and from the standby surface to the active surface by reboot based on the reboot request display by the display device. The PON system according to claim 1, further comprising means for copying firmware and performing firmware update processing . In an automatic download method of connecting a plurality of termination devices to an end station device via an optical splitter through an optical fiber transmission line, and downloading firmware from the end station device to the termination device,
The terminal device has a configuration including a PON interface board compatible with the optical splitter and a supervisory control board for controlling the PON interface board. Comparing the version of the firmware to be downloaded with the version of the firmware in operation of the terminal device at the time, and registering the terminal device with a different version number in the automatic download table as the terminal device to be downloaded; A process of sequentially downloading firmware to the download target terminal device registered in the download table, a step of determining whether the download is normally completed, a process of deleting the normal terminal device from the automatic download table, and the download Download failed to complete successfully And incrementing the number of times of downloading elephant termination device corresponds, and a process for deleting the downloaded terminating device to which the number of downloads has exceeded the set value from said automatic download table
An automatic download method characterized by that. Before starting the download of the firmware for the download target terminal device, obtain the traffic volume for the download target terminal device, determine whether the firmware can be downloaded for the traffic amount, and only when the download is possible, 5. The automatic download method according to claim 4, further comprising a step of starting download of the firmware . The terminal device that has downloaded the firmware from the terminal device and once held it on the standby surface copies the firmware from the standby surface to the active surface by performing a reboot request display and a reboot based on the reboot request display. The automatic download method according to claim 4 , further comprising a process of performing a firmware update process .

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