JP4755630B2 - Optical transmission line termination equipment - Google Patents

Description

  The present invention relates to an optical network termination device management method (ONU management method), and in particular, an OLT (Optical Line Termination), an ONU (Optical Network Unit) or an ONT (Optical Network). The present invention relates to an optical network termination device management method in a PON (Passive Optical Network) system having Termination (optical network termination device).

  Currently, the introduction of a PON system is progressing as a method for realizing high-speed broadband access networks. A PON system consists of a plurality of user-side devices (ONU: optical network terminator) and one station-side device (Optical Line Termination, OLT: optical transmission line terminator) connected in a star configuration using an optical splitter and optical fiber. , A network system for communicating between OLT-ONU devices.

  As the PON system, an ATM-PON system that communicates a PON section based on an ATM (Asynchronous Transfer Mode) communication system is an ITU-T recommendation G.3. It is standardized by the 983 series (for example, refer nonpatent literature 1). In addition, ITU-T Recommendation G. The G984 (Gigabit-capable Passive Optical Networks) system is standardized by the 984 series.

For example, in the ATM-PON system, ITU-T Recommendation G. As described in 983.1 (Non-patent Document 1), a series of processing called a ranging flow is performed in order to establish communication between the OLT and the ONU and establish an ONU connection. The ranging flow process is a function that measures the distance between the OLT and the ONU, determines the transmission timing of the upstream signal from the ONU to the OLT for each ONU, and prevents the upstream signal from colliding. When measuring the distance by the ranging flow process, it is necessary to respond one ONU at a time in order to avoid collision of ONU responses at the time of measurement, and therefore, a unique serial number of the ONU is used. That is, an ONU serial number is designated and an ONU that can respond is specified. An ONU identification number (identifier) called PON-ID is assigned to an ONU whose ONU serial number is known by OLT and the distance can also be measured. Thereafter, the ONU is identified by the PON-ID, and messages between the OLT and the ONU are exchanged. .
The ONU identifier is described as “PON-ID” in Non-Patent Document 1 described later, but may be described as “ONT-ID” or “ONU-ID” depending on the document.

  The unique serial number of the ONU is defined by 64-bit information, the upper 32 bits are defined as a vendor ID representing a vendor (a fixed value for each vendor), and the lower 32 bits are defined as a vendor definition section that can be arbitrarily defined by the vendor. ing. For example, in the 32-bit vendor definition section, ONUs can be identified so that each ONU has a different serial number, such as “assign manufacturing date and serial number” or “use all 32 bits as serial numbers”. To do.

  In the ranging flow process, ONU connection is performed using the unique serial number of the ONU. As an ONU connection method, for example, two methods (method A and method B) are described in 8.4.1.1 of Non-Patent Document 1. It is shown. Method A is, for example, a method of registering the ONU serial number from the operation device (OpS) to the OLT. Method B is, for example, a method in which the serial number of the ONU is not registered in the OLT from the operation device.

  In the case of Method B, the ONU serial number is not registered in the OLT from the operation device. However, since it is necessary to specify the ONU serial number on the OLT side to establish communication between the OLT and the ONU, the ONT serial number is searched on the OLT side. The procedure to do is necessary. The ONU serial number search simply refers to the ONU serial number of the connected ONU with the presence or absence of a response from the ONU by trying various bit patterns (for example, lower-order bits) out of the 64-bit ONU serial number bit pattern. Saying to find a matching bit pattern. Non-Patent Document 1 III. 2 shows an example of an ONU serial number search method.

Also, a system is known that uses the same ONU identifier before and after switching by setting a switch on the ONT side when switching between an active system and a standby system of a plurality of ONUs having a redundant configuration (for example, Patent Document 1). reference). In a redundant configuration, one having the same subscriber unit information (serial number) in the active system and the standby system is known (for example, see Patent Document 2).
JP-A-2005-45566 JP 2003-244179 A ITU-T Recommendation G. 983.1, “Broadband optical access systems based on Passive Optical Networks (PON)”

  When the ranging flow process is performed and the PON-ID is assigned to the connected ONU, subsequent messages between the OLT and the ONU are performed by specifying the ONU by the PON-ID. Therefore, when individual settings are made in the ONU, the individual setting data is expected to be stored in association with the PON-ID. Under such circumstances, for example, when a failure occurs in the ONU and the ONU is replaced, the PON-ID assigned before the replacement is assigned to the ONU after the replacement, and the individual setting before the replacement is performed. I want to inherit and set data.

  Non-Patent Document 1 does not clarify the ONU replacement procedure. If the method A of Non-Patent Document 1, that is, the method of registering the ONU serial number from the OLT in advance is adopted, the serial number of the new ONU is known on the OLT side even when the ONU is replaced. The ONU serial number of the stored data may be rewritten. However, in order to actually perform this method, when the ONU is replaced, the ONU installation builder and the operation device manager communicate in real time and input a new ONU serial number from the operation device to the OLT, or the ONU serial number in advance. In this case, it is necessary to carry out complicated management to reliably distribute the ONU of the serial number to the user who is the exchange destination.

Further, if the method B of Non-Patent Document 1, that is, the method of not registering the ONU serial number from the OLT, is adopted, the OLT searches for the ONU serial number by some method and automatically makes an ONU connection. At this time, if the ONU is simply exchanged and the new ONU is connected, a new PON-ID is assigned and the saved data before the exchange cannot be inherited. Or it becomes necessary to reset data artificially.
Further, in the method of Patent Document 1, it is necessary to set switches on the ONU side. In the method of Patent Document 2, it is necessary to have the same serial number in the active system and the standby system.

  In view of the above points, the present invention provides a new ONU in the PON system in which an ONU connection is made without registering the ONU serial number in the OLT from the operation device and the same PON-ID as before the ONU replacement is replaced. It is an object of the present invention to provide an optical network termination device management method assigned to a network. Another object of the present invention is to inherit setting data before exchange after exchange.

  An object of the present invention is to eliminate the need for an ONU installation builder and an operation device manager to communicate in real time and input an ONU serial number from the operation device to the OLT in the PON system. It is another object of the present invention to facilitate the ONU replacement without having to reset the ONU setting data after the ONU replacement.

  In order to achieve the above object, in the PON system and ONU management method according to the present invention, the OLT includes an area for storing the management status of the PON-ID (PON-ID status) and an ONU serial number connected to the PON-ID. An area (PON-ID management table) to be stored in association with each other, and an area to store the PON-ID and the ONU serial number to be deleted in association with each other (deletion ONU table). -Set the ID management state during ONU exchange, save the PON-ID, assign the PON-ID assigned to the ONU to be exchanged to the newly connected ONU during exchange, and exchange The PON-ID before exchange is assigned to the subsequent ONU.

  The ONU management method of the present invention, for example, registers the serial number of the ONU from the OLT in a PON system in which an OLT and a plurality of ONUs or ONTs are connected in a star shape using an optical fiber and perform communication between OLT-ONU devices. An ONU management method for connecting an OLT and an ONU without any further steps, in which a serial number of the connected ONU and an identifier (PON-ID, ONU identifier) for identifying the ONU are associated and stored in the connection management table And a step of deleting from the connection management table the ONU serial number corresponding to the ONU identifier designated as the exchange target during the ONU exchange, and deleting management by associating the ONU identifier designated as the exchange target with the ONU serial number to be exchanged Steps to save in table and newly connected O after replacement A step of storing the U serial number in the connection management table in association with the ONU identifier designated as the exchange target, and a new ONU serial number associated with the ONU identifier in the deletion management table when stored in the connection management table. The ONU serial number before exchange is deleted from the deletion management table, and the ONU exchange connection is automatically performed using the same ONU identifier as before exchange.

  In the PON system of the present invention, for example, an OLT (Optical Line Termination) and a plurality of ONUs (Optical Network Unit: optical network terminator) are connected in a star shape using an optical fiber and are OLT-ONU devices. PON (Passive Optical Network) system for performing communication between the ONU serial number and the identifier for identifying the ONU in association with each other, and the ONU serial number to be exchanged or deleted An area for storing an identifier associated with the ONU is stored, and an area for storing and indicating whether the ONU is exchanged.

According to the first solution of the present invention,
Each of one or a plurality of first optical network termination devices on the user side and an optical transmission line termination device on the station side are connected via an optical fiber and a splitter, and the first optical network termination device is connected to the optical transmission line termination device. Management for exchanging one of the connected first optical network termination devices with a second optical network termination device in a passive optical network system that communicates according to an identifier assigned to each optical network termination device A method,
Receiving an exchange instruction including the identifier of the first optical network terminating device designated as an exchange target from the operation device;
Corresponding to the identifier of the first optical network termination device, a unique number of the first optical network termination device and communication and / or individual setting information about the user of the first optical network termination device are stored. Obtaining the unique number corresponding to the designated identifier from the first area, and storing the unique number in the second area corresponding to the designated identifier;
Deleting the unique number corresponding to the specified identifier from the first area;
Obtaining a unique number of the first optical network termination device or a unique number of the second optical network termination device newly connected in place of the first optical network termination device;
Determining whether the unique number acquired in the acquiring step is stored with reference to the second area;
If the unique number is not stored, storing the acquired unique number in the first area corresponding to the specified identifier;
If the unique number is stored, an optical network terminating device management method including the step of acquiring, the step of determining, and the step of repeating the step of storing in the first area is provided.

According to the second solution of the present invention,
Each of one or a plurality of first optical network termination devices on the user side and an optical transmission line termination device on the station side are connected via an optical fiber and a splitter, and the first optical network termination device is connected to the optical transmission line termination device. Management for exchanging one of the connected first optical network termination devices with a second optical network termination device in a passive optical network system that communicates according to an identifier assigned to each optical network termination device A method,
Receiving an exchange instruction including the unique number of the first optical network terminating device designated as the exchange target from the operation device;
Corresponding to the identifier of the first optical network termination device, a unique number of the first optical network termination device and communication and / or individual setting information about the user of the first optical network termination device are stored. Obtaining the identifier corresponding to the specified unique number from the first area, and storing the specified unique number in the second area corresponding to the identifier;
Deleting the specified unique number from the first area;
Obtaining a unique number of the first optical network termination device or a unique number of the second optical network termination device newly connected in place of the first optical network termination device;
Determining whether the unique number acquired in the acquiring step is stored with reference to the second area;
If the unique number is not stored, storing the acquired unique number in the first area corresponding to the specified identifier;
If the unique number is stored, an optical network terminating device management method including the step of acquiring, the step of determining, and the step of repeating the step of storing in the first area is provided.

According to another solution of the invention,
Each of one or a plurality of first optical network termination devices on the user side and an optical transmission line termination device on the station side are connected via an optical fiber and a splitter, and the first optical network termination device is connected to the optical transmission line termination device. The optical transmission line termination device in a passive optical network system that communicates according to an identifier assigned to each of the optical network termination devices,
Corresponding to the identifier of the first optical network termination device, a unique number of the first optical network termination device and communication and / or individual setting information about the user of the first optical network termination device are stored. Connection management table,
Corresponding to the identifier, a deletion management table in which the unique number of the first optical network terminating device is stored;
A processing unit for executing processing for exchanging one of the connected first optical network termination devices with the second optical network termination device;
The processor is
Receiving an exchange instruction including the identifier of the first optical network terminating device designated as the exchange target from the operation device;
Obtaining the unique number corresponding to the designated identifier from the connection management table, and storing the unique number in the deletion management table corresponding to the designated identifier;
Deleting the unique number corresponding to the specified identifier from the connection management table;
Obtaining a unique number of the first optical network termination device or a unique number of the second optical network termination device newly connected in place of the first optical network termination device;
Referring to the deletion management table to determine whether the acquired unique number is stored;
If the unique number is not stored, storing the acquired unique number in the connection management table corresponding to the specified identifier;
When the unique number is stored, there is provided the optical transmission line termination device including repeating the acquisition, the determination, and the storage in the connection management table.

According to another solution of the invention,
Each of one or a plurality of first optical network termination devices on the user side and an optical transmission line termination device on the station side are connected via an optical fiber and a splitter, and the first optical network termination device is connected to the optical transmission line termination device. The optical transmission line termination device in a passive optical network system that communicates according to an identifier assigned to each of the optical network termination devices,
Corresponding to the identifier of the first optical network termination device, a unique number of the first optical network termination device and communication and / or individual setting information about the user of the first optical network termination device are stored. Connection management table,
Corresponding to the identifier, a deletion management table in which the unique number of the first optical network terminating device is stored;
A processing unit for executing processing for exchanging one of the connected first optical network termination devices with the second optical network termination device;
The processor is
Receiving an exchange instruction including the unique number of the first optical network terminating device designated as the exchange target from the operation device;
Obtaining the identifier corresponding to the specified unique number from the connection management table, and storing the specified unique number in the deletion management table corresponding to the identifier;
Deleting the specified unique number from the connection management table;
Obtaining a unique number of the first optical network termination device or a unique number of the second optical network termination device newly connected in place of the first optical network termination device;
Referring to the deletion management table, determining whether the unique number obtained by obtaining is stored;
If the unique number is not stored, storing the acquired unique number in the connection management table corresponding to the specified identifier;
When the unique number is stored, there is provided an optical transmission line termination device including repeating the acquisition, the determination, and the storage in the connection management table.

  According to the present invention, in the PON system, an optical network termination that performs ONU connection without registering the ONU serial number from the operation device to the OLT and assigns the same PON-ID as that before the ONU replacement to the new ONU after the replacement. A device management method can be provided. Further, according to the present invention, setting data before exchange can be inherited after exchange.

  According to the present invention, in the PON system, it is not necessary for the ONU installation builder and the operation device manager to contact each other in real time and to input the ONU serial number from the operation device to the OLT when the ONU is installed or replaced. Further, according to the present invention, it is not necessary to reset the ONU setting data after the ONU replacement, and the ONU replacement can be facilitated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Hardware configuration)
FIG. 1 shows an example of the overall system configuration of the PON system in the present embodiment.
The PON system includes, for example, an OLT 40, a plurality of ONUs (60-1 to 60-n), an optical splitter 50, and optical fibers 140 and 150. Moreover, the operation apparatus (OpS) 10, the switching hub 20, the initial setting terminal 80, and the subscriber terminal 70 can be provided.

  In FIG. 1, the OLT 40 is connected to a plurality of ONUs (60-1 to 60-n) through optical fibers (140, 150-1, 150-n) and an optical splitter 50. The optical splitter 50 equally distributes the optical signal sent from the OLT 40 to the optical fiber 140 to a plurality of connected ONUs (60-1 to 60-n). Further, the optical signals transmitted from the plurality of ONUs (60-1 to 60-n) to the optical fibers (150-1 to 150-n) are multiplexed and transferred to the OLT 40. Each ONU (60-1 to 60-n) is connected to a subscriber terminal (70-1 to 70-n) via a line (160-1 to 160-n) such as Ethernet (registered trademark).

  The ONU may be an optical network termination device such as an ONT. The PON system may include a plurality of OLTs 40 and 41. At this time, an ONU, an optical fiber, and an optical splitter are provided for each OLT as shown in FIG.

  The operation device 10 that manages and sets the PON system includes an OLT (40, 41) via a switching hub 20 that transfers lines (100, 110, 111) such as Ethernet (registered trademark) and Ethernet (registered trademark) frames. ).

  The initial setting terminals (80, 81) can be used for initial setting of various parameters at the time of initial setting of the OLT (40, 41) as a stage before connecting the operation device 10, for example, It is connected to the OLT through lines (130, 131) such as a serial cable.

  The OLT (40, 41) is connected to the Internet 30 via a line (120, 121) such as Ethernet (registered trademark), and is connected to subscriber terminals (70-1 to 70-n, 71-1 to 71-). n) It is possible to provide services such as Internet access.

For example, in an ATM-PON system, an ONT (60-1 to 60-n, 61-1 to 61-n) is installed and OLT (40, 41) -ONU before starting service to a subscriber. In order to establish communication between (60-1 to 60-n, 61-1 to 61-n), for example, ONU connection is performed according to the procedure disclosed in Non-Patent Document 1. Further, when the method B of Non-Patent Document 1 is used for connecting an ONU, it is necessary for the OLT to search for the ONU serial number (unique number), identify the serial number of the ONU, and perform connection. In this embodiment, when an ONU is replaced due to an ONU failure or the like, ONU connection is automatically performed without registering the serial number of the replaced ONU from the OLT.
In the following description, an ATM-PON system will be described as an example, but the present invention can also be applied to other systems such as a GPON system.

FIG. 2 is a block configuration diagram showing an example of the OLT 40 in the present embodiment.
2 includes a control network interface unit 410 connected to the operation device 10 or the switching hub 20, a main signal network interface unit 420 connected to the Internet 30, and a serial interface unit connected to the initial setting terminal 80. 430, for example, an optical interface unit 490 that is connected to the ONU 60 via the optical fiber 140 and the optical splitter 50 and includes E / O conversion and O / E conversion, and a PON control that is connected to the optical interface unit 490 and performs PON control Unit 480 and an OLT control unit 440 that controls the OLT.

  The OLT control unit 440 includes a CPU 450, a nonvolatile memory 460, and a volatile memory (RAM) 470. The nonvolatile memory 460 can use a flash memory as an example, but may be an EPROM (Erasable Programmable ROM) or an EEPROM (Electro Erasable Programmable ROM).

  The nonvolatile memory 460 stores, for example, a program code 461, a PON-ID state (state management unit) 462, a PON-ID management table (connection management table) 463, and a deletion ONU table (deletion management table) 464. The program code 461 is an OS or application executed by the CPU 450, and is loaded from the nonvolatile memory 460 to the volatile memory 470 at the time of startup. A main control process 471, an ONU connection main process 472, an ONU connection recovery process 473, an ONU deletion process 474, an ONU exchange process 475, an ONU connection process 476, an ONU setting process 477, and the like are part of the program code 461. The main control process 471 is a main routine for performing OLT control, and activates the ONU connection main process 472 as necessary. Each process will be described later.

(Memory configuration)
FIG. 3 shows an example of the configuration of the PON-ID management table 463 in the present embodiment. The PON-ID management table 463 is a table that stores ONU serial numbers found by searching for ONU serial numbers in the present embodiment in association with “PON-ID”.

  In FIG. 3, the PON-ID management table 463 includes a flag area 4631 indicating whether or not a PON-ID has already been assigned, an area 4632 for storing the serial number of the ONU 60 to which the PON-ID is assigned, and the ONU. An area 4633 for storing individual settings for the. The individual settings may include any information and data including setting parameters necessary for providing services to the user using the ONU 60 and management data used for ONU management. As an example of the individual setting, for example, settings such as a maximum bandwidth allocated to the ONU 60, a network address (IP address), and a customer name of the ONU 60 can be considered. Not limited to these, ONU communication and / or appropriate information about the user may be used.

  In the example of FIG. 3, there is no area for storing the PON-ID itself. This is because if the memory address and the PON-ID are associated with each other, an area for storing the PON-ID is not necessary. Here, the PON-ID is an identifier (ID) for uniquely identifying the message target ONU 60 when a message is sent from the OLT 40 to the ONU 60. When the communication between the OLT and the ONU is established, the serial number of the ONU 60 is set to the OLT 40. Is the ID assigned from the OLT 40 after the identification. The example of FIG. 3 is a configuration example in the case where a maximum of 64 (0 to 63) ONUs are connected, and therefore the area up to PON-ID # 63 is illustrated. An area for storing the PON-ID may be provided.

  The PON-ID allocation flag 4631 shows an example in which the value “1” is stored when the PON-ID has been allocated, and the value “0” is stored when the PON-ID is not allocated. In this case, a method in which a predetermined value (for example, all 0s or a null code) is stored in the ONU serial number storage area 4632 and the PON-ID allocation flag 4631 is not provided is also possible.

  FIG. 4 shows an example of the configuration of the deleted ONU table 464 in the present embodiment. The deleted ONU table 464 corresponds to the serial number of the ONU to be deleted or replaced with “PON-ID” when receiving an ONU deletion instruction or ONU replacement instruction from the operation device 10 or the initial setting terminal 80 in the present embodiment. It is a table to be attached and saved. The ONU deletion instruction from the operation device 10 or the initial setting terminal 80 can be instructed by the PON-ID, but may be instructed by the ONU serial number itself. In FIG. 4, the deletion ONU table 464 includes a deletion target ONU serial number storage area 4641 that is an area for storing the ONU serial number to be deleted or exchanged.

  In the example of FIG. 4, there is no area for storing the PON-ID itself. This is because if the memory address and the PON-ID are associated with each other, an area for storing the PON-ID is not necessary. Since the example in FIG. 4 is a configuration example when a maximum of 64 (0 to 63) ONUs are connected, the area up to PON-ID # 63 is illustrated. An area for storing the PON-ID may be provided.

  For example, when an instruction “ONU deletion of PON-ID # 3” is received from the operation device 10, the ONU serial number storage area 4641 to which the deletion target ONU serial number is stored is the ONU serial number assigned with the PON-ID # 3. Save in the area corresponding to PON-ID # 3. A predetermined value (for example, all 0s or a null code) is stored in an area corresponding to the PON-ID that is in operation (has not received a deletion or replacement instruction). Note that the operation device 10 can specify the PON-ID, for example, upon receiving notification of ONU exchange from a subscriber or the like.

  For example, there may be a time lag after the OLT 40 receives a replacement instruction from the operation device 10 until the ONU installer actually removes the replacement target ONU and connects a new ONU. During this time, for example, the OLT 40 periodically searches for a serial number. Therefore, when the serial number is deleted from the PON-ID management table 463, the ONU before replacement is recognized as a new ONU, and the connection process is performed. Will go. Therefore, the OLT 40 refers to the ONU deletion table 464, and when the searched serial number is stored, the OLT 40 does not execute the connection process or the like assuming that the serial number of the ONU to be exchanged or deleted.

  FIG. 5 is an explanatory diagram showing an example of the definition of the PON-ID state 462 in the present embodiment. In the present embodiment, the PON-ID state 462 takes one of three states of “ONU replacement”, “PON-ID available”, and “PON-ID available”, and is a PON-ID management state. Indicates.

  The example of FIG. 5 is an example in which a maximum of 64 ONUs are connected, and the PON-ID state 462 indicating “ONU is being exchanged” is defined as taking a value from 0 to 63, for example. That is, “PON-ID state 462 = 3” means that a replacement instruction for PON-ID # 3 has been received and the replacement has not yet been completed. Also, when 64 ONUs are connected and PON-IDs # 0 to # 63 have already been assigned, it is defined that the value “255” is taken as “no PON-ID available”. Further, when less than 64 ONUs are connected, it is defined that “PON-ID is available” is taken as one of values “64” to “254”. In addition, the value corresponding to each state can define appropriate values other than the above-mentioned value.

(flowchart)
Next, the operation of the present embodiment will be described.
FIG. 6 shows a flowchart of an example of the ONU connection main process 472 in the present embodiment. The ONU connection main process 472 is a process for processing new connection, deletion, replacement, and connection recovery of the ONU.

  The ONU connection main process 472 is started from the main control process 471 when the OLT is started, for example. In the following description, each process can be executed by the CPU 450. In addition to this process, the CPU 450 receives instructions such as “ONU deletion”, “ONU replacement”, “ONU setting” and the like at an appropriate timing. These instructions can be held in a queue, for example.

  The ONU connection main process 472 searches the PON-ID management table 463 and determines whether one or more PON-IDs have already been assigned (S1 in FIG. 6). If it is already assigned, the ONU connection recovery process 473 is executed to recover the ONU connection using the information stored in the PON-ID management table 463 (S2 in FIG. 6). The ONU connection recovery process 473 is a process for recovering the connection at the time of the previous activation when the OLT is activated, and therefore it may be performed once at the time of OLT activation.

  Next, the ONU connection main process 472 determines whether an “ONU deletion” instruction is received from the operation device 10 or the initial setting terminal 80 (S3 in FIG. 6). When the “ONU deletion” instruction is received, the ONU deletion process 474 is executed (S4 in FIG. 6).

  Next, it is determined whether or not an “ONU exchange” instruction has been received from the operation device 10 or the initial setting terminal 80 (S5 in FIG. 6). When the “ONU exchange” instruction is received, the ONU exchange process 475 is executed (S6 in FIG. 6).

  Next, the PON-ID state 462 is read, and it is determined whether or not the PON-ID state 462 indicates “the PON-ID is available” or “ONU is being replaced” (S7 in FIG. 6). In the present embodiment, as shown in FIG. 5, it is determined whether the PON-ID state has a value of 64 to 254. When the PON-ID status 462 indicates “There is a PON-ID available” or “ONU is being replaced”, the ONU connection process 476 is executed (S8 in FIG. 6). When the PON-ID state 462 indicates “no PON-ID available”, it means that the maximum number of ONUs are connected.

  Next, it is determined whether or not an “ONU setting” instruction has been received from the operation device 10 or the initial setting terminal 80 (S9 in FIG. 6). When the “ONU setting” instruction is received, the ONU setting process 477 is executed (S10 in FIG. 6).

Next, the ONU connection main process 472 returns to the determination of whether or not the “ONU deletion” instruction has been received (S3 in FIG. 6), and repeats the following. By repeating this process, the ONU connection main process can cope with ONU addition connection, exchange, deletion, and setting in operation.
Note that the order of the processes of S3, S5, S7, and S9 in FIG. 6 may be changed.

  7 and 8 show a flowchart of an embodiment of the ONU connection process 476. FIG. The ONU connection process 476 in step S8 is a process for newly connecting the installed ONU. FIG. 9 is a schematic flowchart up to the ONU connection in the ranging flow process described in Non-Patent Document 1. Since the ranging flow is disclosed in Non-Patent Document 1, description thereof is omitted.

  The ONU connection process 476 first performs processing up to the acquisition of the ONU serial number (S903 in FIG. 9) in the ranging flow processing by the method B based on Non-Patent Document 1 (S801 in FIG. 7). In the ranging flow according to the method B, the ONU connection is performed without registering the serial number of the ONU 60 from the OLT 40, and therefore an ONU serial number search process is required. In the present embodiment, a known technique can be used as the ONU serial number search method. Here, if there is a newly connected ONU 60, its serial number is acquired.

  Next, it is determined whether the ONU serial number has been acquired (S802 in FIG. 7). If the ONU serial number could not be acquired (No route in S802 in FIG. 7), the ONU connection processing process 476 is performed to indicate that no new ONU was connected during the one-cycle ONU serial number search. finish.

  If the ONU serial number can be acquired (Yes route in S802 in FIG. 7), it is next determined whether or not the acquired ONU serial number exists in the deleted ONU table 464 (S803 in FIG. 7). If the acquired ONU serial number is present in the ONU deletion table 464 (Yes route in S803 in FIG. 7), the ONU is a deletion target, so the ONU connection is not performed and the ONU search process is continued from the subsequent bit pattern. Therefore, the process returns to the ONU serial number search process (S801 in FIG. 7). For example, when an instruction to delete “ONU” is received, but the ONU itself is still connected, the serial number is searched by the above-described ranging flow, but this ONU does not perform connection processing. If the acquired ONU serial number does not exist in the deleted ONU table 464 (No route in S801 in FIG. 7), the ONU is a newly connected ONU, so the PON-ID state 462 is read next. Then, it is determined whether or not the PON-ID state 462 indicates “ONU is being exchanged” (S804 in FIG. 8). For example, as shown in FIG. 5, it is determined whether the PON-ID state is 0-63.

  When the PON-ID state 462 indicates “ONU is being exchanged” (Yes in S804 in FIG. 8), the value of the PON-ID state 462 is assigned to the ONU that has acquired the serial number. The ID value is set (S805 in FIG. 8). For example, if the PON-ID state 462 indicates the value “3”, “3” is set as the “assigned PON-ID value”.

  When the PON-ID state 462 does not indicate “ONU is being exchanged” (No route in S804 in FIG. 8), the PON-ID management table 463 is searched, and one of the unassigned PON-ID values is assigned as “assigned”. It is set as “PON-ID value” (S806 in FIG. 8). The unassigned PON-ID is a PON-ID in which the PON-ID assignment flag 4631 indicates the value “0”. Alternatively, in another method, the connection ONU serial number 4632 of the PON-ID management table 463 is a PON-ID indicating a predetermined value (for example, all 0s or null codes).

  Next, the processing (S904 to S906 in FIG. 9) after the PON-ID setting in the ranging flow processing described in Non-Patent Document 1 is performed (S807 in FIG. 8). From these processes, the ONU 60 and the OLT 40 are connected.

  Next, in the PON-ID management table 463, a value “1” indicating that the PON-ID assignment flag 4631 and the connected ONU serial number 4632 are assigned to the same PON-ID line as the “assigned PON-ID value”. The acquired ONU serial number is saved, and the PON-ID management table 463 is updated (S808 in FIG. 8).

  Next, in the deletion ONU table 464, the deletion target ONU serial number 4641 in the same PON-ID line as the “assigned PON-ID value” is deleted (initialized) from the table (S809 in FIG. 8). This “S809” process is a process for exchanging ONUs. When the ONU replacement instruction is received, the ONU serial number before replacement that is the deletion target is stored in the deletion target ONU serial number 4641 of the PON-ID row of the deletion ONU table 464. When the ONU exchange is performed, the PON-ID is assigned to the new ONU after exchange, and the deletion-target ONU serial number is deleted from the deletion ONU table 464.

  Next, the PON-ID management table 463 is searched to determine whether there is a PON-ID space (whether there is an unassigned PON-ID) (S810 in FIG. 8). For example, referring to the PON-ID allocation flag, if “0” indicating unallocation exists, it is determined that there is a free space. If there is a vacancy (Yes route in S810 in FIG. 8), the PON-ID state 462 is stored with a value (for example, 64 to 254) indicating “PON-ID available” (S811 in FIG. 8). If there is no free space (No route in S810 in FIG. 8), the PON-ID state 462 is stored with a value (for example, 255) indicating “no PON-ID space” (S811 in FIG. 8). This completes the ONU connection process.

  FIG. 10 shows a flowchart of one embodiment of the ONU connection recovery process 473. The ONU connection recovery process 473 of step S2 in FIG. 6 is a process for recovering the ONU connection according to the settings stored in the past when the OLT is restarted after the OLT is started and the ONU connection is performed.

  The ONU connection recovery process 473 reads each piece of information in the PON-ID management table 463 (S201 in FIG. 10). Next, ranging flow processing (for example, S901, S903 to S906 in FIG. 9) by the method A based on Non-Patent Document 1 is performed on the ONU 60 to which the PON-ID has been assigned (S202 in FIG. 10).

  Although the ONT connection method according to the present embodiment is based on the method B, the ONU serial number is already stored in the PON-ID management table 463 in the ONU connection recovery process 473. It is possible to connect.

  Next, it is determined whether or not ranging flow processing has been completed for all ONUs 60 to which PON-IDs have been assigned (S203 in FIG. 10). If there is an ONU 60 that has been assigned a PON-ID and has not yet been processed (No route in S203 in FIG. 10), the process returns to S201 and the process is repeated. If processing has been completed for all ONUs to which PON-IDs have been assigned (Yes route in S203 in FIG. 10), the ONU connection recovery process 473 ends.

  FIG. 11 shows a flowchart of one embodiment of the ONU deletion process 474. The ONU deletion process 474 in step S4 in FIG. 6 is a process for registering and deleting an ONU that has been connected once, for example, when the ONU 60 is removed due to a contract expiration.

  The ONU deletion process 474 receives an ONU deletion instruction that specifies an ONU to be deleted from the operation device 10 or the initial setting terminal 80. At this time, the ONU to be deleted may be specified by the PON-ID, or by the ONU serial number, and in the ONU deletion process 474, the corresponding PON- from the ONU serial number in the PON-ID management table 463 is specified. The ID may be reversed.

  The ONU deletion process 474 stores the serial number of the deletion-target ONU in the corresponding PON-ID row of the deletion ONU table 464 (S401 in FIG. 11). As the serial number of the ONU to be deleted, for example, the serial number acquired from the PON-ID management table 463 can be used based on the PON-ID instructed by the ONU deletion instruction. Next, in the PON-ID management table 463, the PON-ID allocation flag 4631, the connection ONU serial number 4632, and the individual setting 4633 of the PON-ID row to be deleted are initialized (S402 in FIG. 11).

  Next, the PON-ID state 462 is read, and it is determined whether or not the PON-ID state 462 indicates “ONU is being exchanged” (S403 in FIG. 11). If the PON-ID state 462 does not indicate “ONU is being exchanged” (No route in S403 in FIG. 11), the PON-ID allocation should have been free (unallocated) by deleting the ONU. The PON-ID state 462 is updated and stored so as to indicate “PON-ID available” (S404 in FIG. 11), and the ONU deletion process 474 is ended.

  Also, when the PON-ID state 462 indicates “ONU is being exchanged” (Yes in S403 in FIG. 11), the ONU deletion process 474 is terminated. The ONU replacement process 475 in step S6 of FIG. 6 is a process for replacing the ONU when the ONU fails.

FIG. 12 shows a flowchart of one embodiment of the ONU exchange process 475.
The ONU exchange process 475 receives an ONU exchange instruction that designates an ONU to be exchanged from the operation device 10 or the initial setting terminal 80. At this time, the method of specifying the ONU to be exchanged may be designated by the PON-ID, or by the ONU serial number, and in the ONU exchange process 475, from the ONU serial number of the PON-ID management table 463, the corresponding PON- The ID may be reversed.

  The ONU exchange process 475 stores the serial number of the exchange target ONU in the corresponding PON-ID row of the deleted ONU table 464 (S601 in FIG. 12). As the serial number of the exchange target ONU, the number acquired from the PON-ID management table 463 can be used based on the designated PON-ID.

  Next, in the PON-ID management table 463, the PON-ID assignment flag 4631 and the connection ONU serial number 4632 of the PON-ID row to be exchanged are initialized and stored (S602 in FIG. 12). At this time, since it is ONU exchange, the individual setting 4633 is retained without being initialized.

  Next, the PON-ID state 462 is updated and stored so as to indicate “ONU is being exchanged” (S603 in FIG. 12), and the ONU exchange process 475 is ended. For example, the specified PON-ID value is stored in the PON-ID state 462.

  FIG. 13 shows a flowchart of an embodiment of the ONU setting process 477. The ONU setting process 477 in step S10 of FIG. 6 is a process for setting and saving individual data related to the ONU.

  The ONU setting process 477 receives data contents to be set in the ONU from the operation device 10 or the initial setting terminal 80. The data content includes, for example, a network address, maximum bandwidth, customer name, and the like. At this time, the ONU designation method of the data setting target may be designated by PON-ID, or by the ONU serial number, and in the ONU setting process 477, the corresponding PON is determined from the ONU serial number in the PON-ID management table 463. -ID may be reversed.

The ONU setting process 477 performs data setting for the ONU 60 having the PON-ID in accordance with instructions and data contents from the operation device 10 and the initial setting terminal 80 (S1001 in FIG. 13).
Next, the ONU setting process 477 stores the setting contents in the individual setting 4633 of the corresponding PON-ID row of the PON-ID management table 463 (S1002 in FIG. 13).

  FIG. 14 shows an example of a transition sequence of the PON-ID state 462, the PON-ID management table 463, and the deleted ONU table 464 according to the flowchart of the present embodiment described above. In FIG. 14, for simplification, it is assumed that the maximum number of ONU connections is 2, and the ONU serial number is 1 byte.

  A state 501 in FIG. 14 indicates an initial state, a PON-ID state 462 indicates “the PON-ID is available”, and other values indicate initial values. 14 is connected to one ONU having the ONU serial number 0x0A, operates in accordance with the ONU connection process in FIGS. 7 and 8, and further sets “XXX” as an individual setting in accordance with the ONU setting process in FIG. Indicates the state. A state 503 in FIG. 14 shows a state in which one ONU having an ONU serial number 0x0B is additionally connected, operates in accordance with the ONU connection process in FIGS. 7 and 8, and “YYY” is set as an individual setting.

  A state 504 in FIG. 14 indicates a state in which an ONU with PON-ID # 1 is instructed to be deleted and operated according to the ONU deletion process in FIG. In the ONU deletion process, individual setting (XXX is also deleted). A state 505 in FIG. 14 indicates a state in which the ONU having the PON-ID # 2 is instructed to be operated and operated according to the ONU replacement process in FIG. In the ONU exchange process, the individual setting (YYY) is not deleted.

The state 506 in FIG. 14 shows the result of replacing the ONU having the ONU serial number 0x0B with the new ONU having the ONU serial number 0x0C and operating according to the ONU connection process of FIGS. The previous individual setting data “YYY” indicates a state inherited by the ONU (serial number 0x0C) after replacement.
In the first embodiment, the ONU management method in the ATM-PON system is shown as an example. However, the ONU management method in the GPON system and other PON systems can be applied.
As described above, according to the present embodiment, in the PON system, it is necessary to input the ONU serial number from the operation device to the OLT by contacting the ONU installation builder and the operation device administrator when installing or replacing the ONU. There is no need to reset the ONU setting data, and the ONU exchange can be facilitated.

  The present invention can be used for, for example, a PON system, an access network, and the like.

An example of the whole system structure of the PON system in this invention. The block block diagram which shows one Example of OLT in this invention. An example of a structure of the PON-ID management table in this invention. An example of a structure of the deletion ONU table in this invention. An example of the definition of the PON-ID state in this invention. An example of the flowchart of the ONU connection main process in this invention. An example of the flowchart of the ONU connection process in this invention. An example of the flowchart of the ONU connection process in this invention. 9 is a flowchart showing an overview of ranging flow processing in Non-Patent Document 1. An example of the flowchart of the ONU connection restoration process in this invention. An example of the flowchart of the ONU deletion process in this invention. An example of the flowchart of the ONU exchange process in this invention. An example of the flowchart of the ONU setting process in this invention. An example of a sequence according to the invention.

Explanation of symbols

10 Operation device (OpS)
20 Switching hub 30 Internet 40, 41 OLT
50, 51 Optical splitter 60, 60-1 to 60-n, 61-1 to 61-n ONU
70-1 to 70-n, 71-1 to 71-n Subscriber terminal 80, 81 Initial setting terminal 100, 110, 111, 120, 121 Line 130 such as Ethernet (registered trademark), 131 Line 140 such as serial cable 141 Optical fibers 150-1 to 150-n, 151-1 to 151-n Optical fibers 160-1 to 160-n, 161-1 to 161-n Line 410 such as Ethernet (registered trademark) Control network interface unit 420 Main signal network interface unit 430 Serial interface unit 440 OLT control unit 450 CPU
460 Non-volatile memory 461 Program code 462 PON-ID state 463 PON-ID management table 464 Deleted ONU table 470 Volatile memory (RAM)
471 Main control process 472 ONU connection main process 473 ONU connection recovery process 474 ONU deletion process 475 ONU exchange process 476 ONU connection process 477 ONU setting process 490 Optical interface unit 501 to 506 Example sequence according to the present invention 4631 PON-ID assignment Flag (storage area)
4632 Connection ONU serial number (storage area)
4633 Individual setting (storage area)
4641 ONU serial number to be deleted (storage area)

Claims (5)

  A PON optical transmission line termination device connected to a plurality of optical network termination devices,
  When there is the optical network termination device excluded from the PON, the optical transmission line termination device assigned to the excluded optical network termination device is used for identifying each of the plurality of optical network termination devices. A first region that holds the identification information of
  When there is the optical network termination device excluded from the PON, a storage unit having a second area for holding second identification information uniquely assigned to the excluded optical network termination device at the time of manufacturing the device; ,
  When the second identification information is searched for a plurality of the optical network terminating devices, and the new second identification information is acquired, the newly acquired second identification information is stored in the memory. Whether the second identification information is not held in the second area and the first area of the storage unit is not in the first area. Control for allocating the first identification information held in the first area to the optical network terminating device having the newly acquired second identification information when one identification information is held And
An optical transmission line termination device comprising:   The optical transmission line termination device according to claim 1,
  The control unit, when the newly acquired second identification information is not held in the second area, and the first identification information is not held in the first area An optical transmission line characterized by allocating the first identification information not yet allocated to another optical network termination device to the optical network termination device having the newly acquired second identification information Termination equipment.   The optical transmission line termination device according to claim 1,
  When the newly acquired second identification information is held in the second area, the control unit searches for the second identification information for a plurality of the optical network termination devices, An optical transmission line terminating device, characterized by continuing from a bit pattern following the newly acquired second identification information.   The optical transmission line termination device according to any one of claims 1 to 3,
  The storage unit includes a third area for storing the second identification information of the optical network terminating device to which each of the first identification information is assigned in association with each of the plurality of first identification information. Have
  The control unit corresponds to the third area, the newly acquired second identification information, and the first identification information assigned to the optical network terminating device having the second identification information. An optical transmission line termination device characterized by being attached and held.   The optical transmission line termination device according to claim 1,
  The storage unit includes the first identification information of the optical network termination device to be excluded from the PON, and the first identification information not yet allocated to the optical network termination device in the plurality of first identification information A fourth area for holding any of the information indicating whether there is identification information;
  The control unit, in the fourth area, is still assigned to the optical network termination device in the first identification information of the excluded optical network termination device or a plurality of the first identification information. The second identification information is searched for a plurality of the optical network terminating devices when any of the information indicating that there is the first identification information that has not been stored is held. Optical transmission line termination device.

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