JP2010141487A - Pon system, onu device, extension function execution method in pon system, and extension function execution program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PON (Passive Optical Network) system in which an OLT (Optical Line Terminal) device properly executes an extension function to an ONU (Optical Network Unit) device, the ONU device, and an extension function execution method and an extension function execution program in the PON system. <P>SOLUTION: The PON system 10 includes the OLT device 11 which includes a discovery process execution means for executing a discovery process, a function extension communication channel forming means for forming a function extension communication channel to subordinate devices in accordance with execution of the discovery process and giving them specific function extension identifiers, respectively, and a transmission means for incorporating the function extension identifier and extension function identifier to transmit a frame for extension function to the subordinate devices as one address; and a plurality of ONU devices 12 with the extension function execution means for executing an extended function by extracting the extension function identifier when a function extension frame is transmitted from the OLT device 11 and the function extension identifier matches one of its own device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a PON system, an ONU device, an extended function execution method in the PON system, and an extended function execution program.

  A PON (Passive Optical Network) system in which an OLT (Optical Line Terminal) device and a plurality of ONU (Optical Network Unit) devices are connected via an optical coupler via an optical fiber transmission line is a first related technology of the present invention. It is known (see, for example, Patent Document 1).

FIG. 23 shows an example of the configuration of the GE-PON system in the first related technology of the present invention. A GE-PON (Gigabit Ethernet (registered trademark) Passive Optical Network) system 100 according to the first related technology includes an OLT device 102 connected to a host device 101, and an optical fiber cable connecting the OLT device 102 and the coupler 103. and 104, the first to third optical fiber cable 106 _{1-106 3} respectively connecting the coupler 103 and the first to third ONU apparatus 105 ₁ to 105 _3, first through third ONU 105 ₁ one for 105 ₃ is constituted by the first to third terminal device 107 ₁ to 107 ₃ connected individually.

Here, the OLT device 102 includes a frame buffer unit 111 that temporarily stores bidirectional frames, and an SNI (Service Node Interface) that converts the format of signals transferred between the frame buffer unit 111 and the host device 101. ) Termination unit 112, PON termination unit 113, optical / electrical conversion unit 114 disposed between the PON termination unit 113 and the optical fiber cable 104, and for mutually converting an optical signal and an electrical signal, and the GE-PON system 100 A system control unit 115 for performing maintenance and control. The PON terminator 113 transfers the frame between the optical / electrical converter 114 and the LL ID identifying unit 121 that detects a LL ID (Logical Link identifier) included in the frame, and the LL ID identifying unit 121 Frames are mutually transferred, MAC (Media Access Control) units 123 to 126 serving as frame transmission sources or destinations, and these MAC units 123 to 126 and the respective frames are transferred to each other. The MPCP (multi-point control protocol) unit 128 that controls link setting and uplink communication with the ONU devices 105 _{1 to} 105 ₃ and transfers frames to and from the frame buffer unit 111, and the MPCP unit 128 mutually OAM (Operations, administration, maintenance) frames are transferred, OAM frames are analyzed and generated, and also transmitted to the system controller 115. It is constructed from the OAM portion 129 Metropolitan to be transferred to each other.

The first to third ONU devices 105 _{1 to} 105 ₃ have substantially the same configuration. Therefore, the configuration of the first ONU device 105 ₁ will be described representatively. The first ONU device 105 ₁ includes an optical / electrical conversion unit 141 that mutually converts an optical signal and an electrical signal, a PON termination unit 142 that transfers the optical / electrical conversion unit 141 and a frame, and a PON termination unit. a frame buffer 143 for temporarily storing connect parts 142 and end frame, the format of the signals to be transferred to and from the frame buffer 143, a signal format to be transferred to the first terminal device 107 ₁ and the mutual A UNI (User Network Interface) terminating unit 144 for converting the signal and the PON terminating unit 142 are provided with a control circuit 145 that transfers signals to each other and performs maintenance and control of the GE-PON system. Here, the PON termination unit 142 transfers the frame between the optical / electrical conversion unit 141 and the LL ID identifying unit 151 that detects the LL ID included in the frame, and the LL ID identifying unit 151 and each frame. The MAC units 153 and 154 serving as frame transmission sources or destinations, and the MAC units 153 and 154 and the respective frames are transferred to each other, and link setting with the OLT device 102 and control of uplink communication are performed. The MPCP unit 156 is configured to perform an OAM frame analysis and generation of an OAM frame by transferring a frame to and from the MPCP unit 156.

In the GE-PON system 100 shown in FIG. 23, a plurality of ONU devices 105 (shown as first to third ONU devices 105 _{1 to} 105 ₃ in the figure) are provided for one OLT device 102. The connected P2MP (Point to Multipoint) form is adopted. However, logically the MAC unit 123 of the OLT 102 and the first MAC 153 of the ONU 105 ₁ by LL ID, allowing P2P (Peer to Peer) of the connected frame form transfer.

The frame transmitted from the OLT device 102 in the MAC downlink communication of the OLT device 102 is transmitted to the first to third ONU devices 105 _{1 to} 105 ₃ as all ONU devices in a broadcast form due to the characteristics of the GE-PON system 100. Sent. When the first to third ONU apparatuses 105 _{1 to} 105 ₃ receive the frame, they identify the LL ID embedded in the frame. Then, only the frame addressed to the own device is taken in, and the frame not addressed to the own device is discarded. On the other hand, in uplink communication, frames from the _first to _third ONU devices 105 _{1 to} 105 ₃ are collected on one optical fiber cable 104 via the coupler 103. For this reason, when the transmission timings of the _first to _third ONU devices 105 _{1 to} 105 ₃ overlap, these frames interfere with each other in the optical fiber cable 104.

Therefore, the transmission timing of each frame in uplink communication in the GE-PON system 100 is controlled by the MPCP unit 128. That is, when the communication path (logical link) between the OLT device 102 and the ONU device 105 is set by the discovery (Discovery) process, the MPCP unit 128 in the OLT device 102 sets the transmission permission timing and permission to each LL ID. A gate frame indicating a period is periodically transmitted. For example, the MPCP unit 156 in the _first ONU apparatus 105 ₁ calculates the amount of uplink data or the amount of frames stored in the frame buffer unit 143 within the time and period designated by the received gate frame. Then, a report frame for notifying the MPCP unit 128 in the OLT device 102 of the frame amount to be transmitted is transmitted. Here, if the MPCP unit 128 cannot receive the frame from the MPCP unit 156 in the _first ONU device 105 ₁ for the gate frame, the MPCP unit 128 discards the LL ID and determines the logical link as not having a response to the gate message. I will cut it.

In such first related art GE-PON system 100 according to a first ONU 105 ₁ fails, at a situation where results in constantly emitting, optical fiber cable 104 is occupied, second, 3 ONU devices 105 ₂ and 105 ₃ may be unable to communicate. In order to prevent such a situation, it has been proposed as a second related technique of the present invention to stop the light emission of the _first ONU device 1051 by remote operation from the OLT device 102 side (for example, Patent Document 2).

In the second related technology, referring to FIG. 23, when an abnormality is detected on the OLT device 102 side, a command is sent to the _first ONU device 1051. Upon receiving this command, the first ONU device 105 ₁ processes the data to stop the light emission according to the authority of the system administrator, or by stopping the power supply of the optical / electrical converter 141, The flash is stopped.
Japanese Patent Laying-Open No. 2007-281979 (paragraph 0014, FIG. 3) JP 2008-28451 A (the 0043 paragraph, the 0044 paragraph, FIG. 6, FIG. 7)

However, when this second related technology is used, there is a problem that it is difficult to specify which ONU device 105 always emits light. For example, the system administrator infers that the first ONU device 105 ₁ may always emit light, and sends a light emission stop command to the _first ONU device 105 ₁ to forcibly emit light. Suppose that the process to stop automatically is performed. If the line status of the other second and third ONU devices 105 ₂ and 105 ₃ is improved in this situation, the first ONU device 105 ₁ that has performed the process of stopping the light emission at that time always emits light. It can be specified that the ONU device 105 has been used. However, if there is no improvement in the line status of the second and third ONU devices 105 ₂ and 105 ₃ , the first ONU device 105 ₁ is normal with respect to light emission. In this case, OLT 102 first ONU 105 ₁ of the light emitting again, it is necessary to allow.

However, at this stage, the logical link between the OLT device 102 and the first ONU device 105 ₁ has been disconnected. Therefore, it is impossible to send a command to allow the emission to the first ONU 105 ₁ from the OLT device 102. Therefore, in order to recover the first light emitting function of the ONU 105 _1, a user whether to restart the first power of the ONU 105 _1, dispatching a maintenance person of the first to the ONU 105 ₁ Is necessary and inefficient.

On the other hand, it is assumed OLT device 102 that could be identified as a result of performing the processing for stopping the light emission of the first ONU 105 ₁ is an apparatus that first ONU 105 ₁ had emission at all times . In this case, the second and third ONU devices 105 ₂ and 105 ₃ can start communication. However, the first user of the ONU 105 ₁ recognizes a problem in a situation that does not know the fact of the GE-PON system 100 failure, simply referred to as a first ONU 105 ₁ to his possession no longer emission Only. Therefore, the first ONU 105 ₁ user restarts the first power of the ONU 105 ₁ in order to solve this problem. Then, since the first ONU device 105 ₁ was originally in a state that always emits light due to some trouble, the first ONU device 105 ₁ falls into a constantly emitting state until a command is received again from the OLT device 102 by restart. As a result, GE-PON system 100 will be returned to the original fault condition, the treatment is completely useless for stopping the light emission OLT device 102 has made to the first ONU 105 _1.

  Accordingly, an object of the present invention is to provide a PON system, an ONU device, an extended function execution method and an extended function execution program in the PON system that allow the OLT device to appropriately execute an extended function for the subordinate ONU device. It is to provide.

  In the present invention, (a) a discovery process executing means for executing a discovery process for setting a communication path for a plurality of subordinate devices that are star-connected via an optical coupler, and a discovery process performed by the discovery process executing means In accordance with the execution of the process, a function expansion communication path forming means for forming a function expansion communication path for these subordinate apparatuses and giving each apparatus a unique function expansion identifier, and this function A function expansion frame is created by incorporating the function expansion identifier given to any one of a plurality of subordinate apparatuses having a function expansion communication path formed by the expansion communication path forming means. Function expansion frame creation means and functions extended to the function expansion frame created by the function expansion frame creation means An OLT device comprising a function expansion frame sending means which incorporates an extended function identifier to be sent and sends one of the plurality of subordinate devices as a destination to the above-described function extension communication path; A function expansion frame receiving means for receiving the function expansion frame when the function expansion frame is sent from the OLT apparatus, and the function expansion received by the function expansion frame reception means. A function extension identifier comparing means for extracting the function extension identifier from the frame and comparing whether the identifier matches the function extension identifier given from the OLT device to the own device; The extended function identifier described above from the function extension frame received by the function extension frame receiving means when it is determined that the identifier comparing means match. And extension identifier extracting means for extracting, PON system and a plurality of ONU apparatus having a extension execution means for executing the functions extension indicated by extension identifier extracted by the extension identifier extracting means comprises.

  In the present invention, (a) a discovery process executing means for executing a discovery process for setting a communication path for a plurality of subordinate apparatuses star-connected via an optical coupler, and the discovery process executing means In accordance with the execution of the discovery process, a function expansion communication path is formed for these subordinate apparatuses, and a function expansion communication path forming unit that gives each apparatus a unique function expansion identifier, For function expansion that incorporates the function expansion identifier given to any one of the plurality of subordinate apparatuses in which the function expansion communication path is formed by the function expansion communication path forming means. Function expansion frame creation means for creating a frame, and a function expansion frame created by the function expansion frame creation means A light emission stop command for stopping the light emission of the light emitting means for signal transmission individually provided in the subordinate apparatus, and a light emission permission command for permitting light emission after light emission of these light emitting means is stopped by the light emission stop command. An OLT device comprising: a function extension frame sending means for sending one of the plurality of subordinate devices as a destination to the function extension communication path by selecting and incorporating any one of B) The above-mentioned subordinate apparatus, and the function expansion frame receiving means for receiving the function expansion frame when it is sent from the OLT apparatus, and the function expansion frame receiving means received The function extension identifier is extracted from the function extension frame and is given to the own apparatus from the OLT apparatus. Function expansion identifier comparison means for comparing whether or not they match, and command extraction means for extracting a command from the function expansion frame received by the function expansion frame reception means when it is determined that the function expansion identifier comparison means matches And a light emission stopping means for stopping the light emission of the light emitting means of the device when the command extracted by the command extraction means is the light emission stop command, and the light emission stopping means stops the light emission of the light emitting means. The function of holding the light receiving function by the light receiving means by holding the function extending communication path while the light receiving means constituting the function extending frame receiving means maintains the light receiving state. The command extracted by the extension communication path holding means and the command extraction means is the above-described emission permission command. The PON system includes a plurality of ONU devices including a light emission return means for returning to a state in which light emission can be performed when light emission of the light emission means of the own device is stopped by the light emission stop means. .

  Further, in the present invention, (b) light emitting means for performing light emission control for transmitting a frame composed of an optical signal to the OLT device in a time zone assigned to the own device, and (b) from the OLT device described above A function extension frame receiving means for receiving a function extension frame incorporating any of the commands such as the light emission stop command for stopping the light emission itself of the light emission means and the light emission permission command for permitting the light emission control after the light emission is stopped; (C) a command extracting means for extracting the above-mentioned command by taking in the function-enhancing frame received by the function-enhancing frame receiving means to the own apparatus and (d) the light-emitting means described above. An uplink communication control switch for controlling on / off of communication addressed to the OLT device by the light emission control of (5), and (e) the command extraction means When the described light emission stop command is extracted, the above-described uplink communication control switch is turned off to stop the above-mentioned frame communication, while the above-described command extraction means extracts the above-described emission permission command, the above-described uplink communication. The ONU device includes an upstream communication control switch control unit that turns on the control switch and permits communication of the frame.

  Further, in the present invention, (b) a discovery process execution step for executing a discovery process for setting a communication path for a plurality of subordinate apparatuses star-connected via an optical coupler in the OLT apparatus; A function for forming a function expansion communication path for ONU devices as subordinate devices in accordance with the execution of the discovery process in the discovery process execution step, and giving each device a unique function expansion identifier. An extension communication path forming step, and (c) the above described function extension identifier given to any of the apparatuses in which the function extension communication path is formed by the function extension communication path forming step. A function expansion frame creating step for creating a built-in function expansion frame; and (d) this function expansion frame. A function expansion frame sending step in which an extended function identifier representing the extended function is incorporated into the function extension frame created by the creating step and one of the subordinate devices is sent to the function extension communication path as a destination; (E) In the ONU device as the subordinate device described above, a function expansion frame receiving step for receiving a function expansion frame when it is sent from the OLT device in the function expansion frame transmission step described above; , (F) The function expansion identifier is extracted from the function expansion frame received in the function expansion frame reception step, and this matches the function expansion identifier given to the own apparatus from the OLT apparatus. And (g) this function extension identifier comparison step. An extension function identifier extraction step for extracting the extension function identifier from the function extension frame received in the function extension frame reception step when it is determined that the comparison results match, and (h) extraction by the extension function identifier extraction step The extended function execution method in the PON system includes an extended function execution step in which the extended function indicated by the extended function identifier is executed by the ONU device as one of the subordinate devices.

  Further, in the present invention, (b) a discovery process execution step for executing a discovery process for setting a communication path for a plurality of subordinate apparatuses star-connected via an optical coupler in the OLT apparatus; A function for forming a function expansion communication path for ONU devices as subordinate devices in accordance with the execution of the discovery process in the discovery process execution step, and giving each device a unique function expansion identifier. An extension communication path forming step, and (c) the above described function extension identifier given to any of the apparatuses in which the function extension communication path is formed by the function extension communication path forming step. A function expansion frame creating step for creating a built-in function expansion frame; and (d) this function expansion frame. The light emission stop command for stopping the light emission of the signal sending light emitting means individually provided in the subordinate apparatus described above in the function expansion frame created in the forming step, and the light emission of these light emitting means by the light emission stop command described above A function expansion frame sending step of selecting and incorporating any one of the light emission permission commands for allowing light emission after stopping and sending one of the subordinate devices to the above-described function extension communication path; E) In the ONU apparatus as one of the subordinate apparatuses described above, a function expansion frame receiving step for receiving the function expansion frame when it is sent from the OLT apparatus, and (f) this function The function extension identifier is extracted from the function extension frame received in the extension frame receiving step, and this is stored in the local apparatus. A function expansion identifier comparison step for comparing whether or not the above described function extension identifier given from the OLT device matches, and (g) when it is determined that the comparison result matches in this function expansion identifier comparison step. A command extraction step for extracting a command from the function expansion frame received in the function expansion frame reception step; and (h) when the command extracted in this command extraction step is the light emission stop command described above, A light emission stop step for stopping the light emission, and (i) the communication path for function expansion described above while the light emission means can be received even after the light emission of the light emitting means is stopped in the light emission stop step. A function expansion communication path holding step for holding the light receiving function by the light receiving means by holding When the command extracted in the command extraction step described above is the above-described light emission permission command, when the light emission of the light emitting means of the own device is stopped by the above-described light emission stop step, the light emission return for returning it to the light emission enabled state And an extended function execution method in the PON system.

  Further, in the present invention, the discovery process in which the computer of the OLT device sets communication paths for a plurality of subordinate ONU devices that are star-connected via an optical coupler as an extended function execution program in the PON system. (B) In accordance with the execution of the discovery process by this discovery process execution process, a function expansion communication path is formed for the plurality of ONU devices under control, respectively. A function expansion communication path forming process for giving a unique function expansion identifier to these apparatuses, and (c) any of a plurality of ONU apparatuses in which a function expansion communication path is formed by the function expansion communication path forming process. Create a function expansion frame that incorporates the function expansion identifier given to the device. Function expansion frame creation processing, and (d) light emission for stopping the light emission of the signal transmission light emitting means individually provided in the subordinate apparatus described above in the function expansion frame created by this function expansion frame creation processing Either the stop command or the light emission permission command for allowing the light emission after the light emission of these light emitting means is stopped by the light emission stop command described above is selected and incorporated into the function expansion communication path described above. By sending one address as a destination, the function expansion frame sending process for instructing the stop or permission of the light emission of the light emitting means of the apparatus is executed.

  Further, according to the present invention, the ONU computer that is star-connected to the OLT device via the optical coupler is used as an extended function execution program in the PON system, and (a) the OLT device executes the discovery process by the discovery process execution process. A function extension identifier storing process for holding a function extension identifier unique to the ONU device as its own device for the function extension communication path formed in accordance with the function extension, and (b) the function extension described above by the OLT device When the function extension frame incorporating the function identifier is sent, the function extension identifier is extracted from the function extension frame, and whether this matches the function extension identifier stored in the own apparatus. The comparison result is the same between the function expansion identifier comparison process to be compared and (c) the function expansion identifier comparison process. Then a command extracting process for extracting a command from the expansion frame when it is determined, is characterized in that to execute the command execution process performed by the own device commands extracted by (d) This command extraction process.

  As described above, according to the present invention, when the OLT device side in the PON system executes the discovery process, a function expansion communication path is formed for a plurality of subordinate ONU devices, and each has a unique function expansion identifier. Is sent to these devices and the function expansion frame is transmitted to the ONU device specified by the function expansion identifier. As a result, various instructions can be given to the ONU device, and for example, it is possible to perform an extensive control such as ON / OFF control of the light emitting means on the ONU device side for each ONU device.

  FIG. 1 shows a claim correspondence diagram of the PON system of the present invention. The PON system 10 of the present invention includes a discovery process execution unit that executes a discovery process for setting communication paths for a plurality of subordinate apparatuses that are star-connected via an optical coupler, and the discovery process execution unit. In accordance with the execution of the discovery process, a function extension communication path is formed for these subordinate apparatuses, and a unique function extension identifier is given to each of these apparatuses. Create a function expansion frame that incorporates the function expansion identifier given to one of a plurality of subordinate apparatuses that have a function expansion communication path formed by the function expansion communication path forming means. The function extension frame creation means to be used and the function extension frame created by the function extension frame creation means An OLT device 11 including a function extension frame sending means that incorporates an extension function identifier representing a function that is extended and sends one of the plurality of subordinate devices as a destination to the function extension communication path. A function extension frame receiving unit that receives the function extension frame from the OLT device 11 when the function extension frame is sent from the OLT device 11, and a function received by the function extension frame reception unit. A function expansion identifier comparing means for extracting the function expansion identifier from the expansion frame and comparing whether the identifier matches the function expansion identifier given from the OLT device 11 to the own apparatus; When it is determined that the identifier comparison means match, the above-mentioned extension function identification is made from the function extension frame received by the function extension frame receiving means. And it includes a extension identifier extracting means for extracting, and a plurality of ONU device 12 with an extended function executing means for executing the functions extension indicated by extension identifier extracted by the extension identifier extracting means.

  FIG. 2 shows a claim correspondence diagram of another PON system of the present invention. Another PON system 20 of the present invention includes a discovery process execution means for executing a discovery process for setting a communication path for a plurality of subordinate apparatuses that are star-connected via an optical coupler, and this discovery process execution In accordance with the execution of the discovery process by the means, a function expansion communication path is formed for these subordinate apparatuses, and a unique function expansion identifier is given to each of these apparatuses. A function expansion incorporating the function expansion identifier given to any of the plurality of subordinate apparatuses in which the function expansion communication path is formed by the function expansion communication path forming means. Function expansion frame creation means for creating a function frame, and function extensions created by the function expansion frame creation means A light emission stop command for stopping the light emission of the light emitting means for signal transmission individually provided in the devices under the above-described frame, and light emission for allowing the light emission after the light emission of these light emission means is stopped by the light emission stop command described above An OLT device 21 comprising: a function expansion frame sending means which selects and incorporates one of the permission commands and sends one of the plurality of subordinate devices to the function expansion communication path as a destination. And a function extension frame receiving means for receiving the function extension frame when the function extension frame is sent from the OLT device 21 and the function received by the function extension frame receiving means. The above-mentioned function extension identifier is extracted from the extension frame and this is given to the own apparatus from the OLT device 21 as described above. Function expansion identifier comparison means for comparing whether or not they match, and command extraction means for extracting a command from the function expansion frame received by the function expansion frame reception means when it is determined that the function expansion identifier comparison means matches And a light emission stopping means for stopping the light emission of the light emitting means of the device when the command extracted by the command extraction means is the light emission stop command, and the light emission stopping means stops the light emission of the light emitting means. The function of holding the light receiving function by the light receiving means by holding the function extending communication path while the light receiving means constituting the function extending frame receiving means maintains the light receiving state. The command extracted by the extension communication path holding means and the command extraction means is the above-described emission permission command. In some cases, a plurality of ONU devices 22 including a light emission return means for returning the light emission of the light emission means of the own apparatus to a state in which the light emission can be emitted when the light emission is stopped by the light emission stop means.

  FIG. 3 is a diagram corresponding to the claims of the ONU device of the present invention. The ONU device 30 of the present invention includes a light emitting means 31 for performing light emission control for transmitting a frame composed of an optical signal to the OLT device in a time zone assigned to the own device, and a light emitting means from the OLT device. A function expansion frame receiving means 32 for receiving a function expansion frame incorporating a command such as a light emission stop command for stopping the light emission itself of 31 or a light emission permission command for permitting light emission control after the light emission is stopped; When the function expansion frame received by the function expansion frame receiving unit 32 is addressed to the own device, the command extraction unit 33 extracts the above-mentioned command by taking it into the own device, and the OLT described above by the light emission control of the light emitting unit 31. The upstream communication control switch 34 for controlling on / off of communication addressed to the apparatus and the command extraction means 33 emit light as described above. When the stop command is extracted, the uplink communication control switch 34 is turned off to stop the communication of the frame. On the other hand, when the command extraction means 33 extracts the light emission permission command, the uplink communication control switch 34 is turned on. And an uplink communication control switch control unit 35 that permits the above-described frame communication.

  FIG. 4 is a diagram corresponding to claims of the extended function execution method in the PON system of the present invention. The extended function execution method 40 in the PON system of the present invention is a discovery process execution step 41 in which the OLT apparatus executes a discovery process for setting communication paths for a plurality of subordinate apparatuses that are star-connected via an optical coupler. In accordance with the execution of the discovery process in the discovery process execution step 41, a function expansion communication path is formed for the ONU apparatuses as the subordinate apparatuses, and a unique function expansion identifier is assigned to each of these apparatuses. Function expansion communication path formation step 42 to be provided to the function expansion communication path provided to the apparatus for any one of the apparatuses in which the function expansion communication path is formed by the function expansion communication path formation step 42 Function expansion frame creation step for creating a function expansion frame incorporating an identifier 43 and an extension function identifier representing the extended function in the function extension frame created in this function extension frame creation step 43, and one of the subordinate devices described above is set as the destination in the function extension channel. A function expansion frame transmission step 44 to be transmitted and a function of receiving the function expansion frame sent from the OLT device in the function expansion frame transmission step 44 in the ONU apparatus as the subordinate apparatus described above The function extension identifier received from the OLT apparatus described above is extracted from the function extension frame received in the function extension frame reception step 45 and the function extension identifier received from the OLT apparatus. A function expansion identifier comparison step 46 for comparing whether the identifier matches the identifier for use, and An extension function identifier extraction step 47 for extracting the extension function identifier from the function extension frame received in the function extension frame reception step 45 when it is determined that the comparison results match in the function extension identifier comparison step 46; An extended function execution step 48 for executing an extended function indicated by the extended function identifier extracted in the identifier extraction step 47 in an ONU device as one of the subordinate devices described above.

  FIG. 5 is a diagram corresponding to claims of an extended function execution method in another PON system of the present invention. An extended function execution method 50 in another PON system of the present invention is a discovery process execution in which an OLT apparatus executes a discovery process for setting communication paths for a plurality of subordinate apparatuses that are star-connected via an optical coupler. In accordance with the execution of the discovery process in step 51 and this discovery process execution step 51, a communication channel for function expansion is formed for the ONU devices as subordinate devices, and unique function expansion identifiers are respectively provided. The function expansion communication path forming step 52 given to the apparatus and the function given to the apparatus with respect to any of the apparatuses in which the function expansion communication path is formed by the function expansion communication path forming step 52 A function extension frame creation module that creates a function extension frame incorporating an extension identifier. 53, a light emission stop command for stopping the light emission of the light emitting means for signal transmission provided in each of the devices under the function expansion frame created in the function expansion frame creation step 53, and these Select one of the light emission permission commands that allow light emission after the light emission of the light emitting means is stopped by the light emission stop command described above, and set one of the subordinate devices in the function expansion communication path as the destination. In the function expansion frame transmission step 54 to be transmitted and the ONU device as one of the subordinate devices described above, when the function expansion frame is transmitted from the OLT device, the function expansion frame is received. From the reception step 55 and the function expansion frame received in the function expansion frame reception step 55 A function expansion identifier comparison step 56 for extracting a function expansion identifier and comparing whether or not this identifier matches the function expansion identifier given from the OLT device to the own device, and this function expansion identifier comparison step 56 When the comparison result is determined to match, the command extraction step 57 for extracting a command from the function expansion frame received at the function expansion frame reception step described above, and the command extracted at the command extraction step 57 is the light emission stop command described above. The light emission stop step 58 for stopping the light emission of the light emitting means of the device itself and the state in which the light emission can be received even after the light emission of the light emitting means is stopped in this light emission stop step. By holding the function expansion communication path, the light receiving function by the light receiving means is maintained. When the command extracted at the function expansion communication path holding step 59 and the command extracting step 57 is the above-described light emission permission command, the light emission of the light emitting means of the own apparatus is stopped at the light emission stop step 58. A light emission return step 60 for returning to a light emission enabled state.

  FIG. 6 shows a claim correspondence diagram of the extended function execution program in the PON system of the present invention. The extended function execution program 70 in the PON system of the present invention is a discovery program in which a computer of an OLT device executes a discovery process for setting communication paths for a plurality of ONU devices under star connection via an optical coupler. In accordance with the execution of the process execution process 71 and the discovery process by the discovery process execution process 71, a function expansion communication path is formed for the plurality of ONU devices under its control, each having a unique function expansion identifier. Function expansion communication path forming process 72 for providing these apparatuses to the apparatus, and any one of a plurality of ONU apparatuses in which the function expansion communication path is formed by the function expansion communication path forming process 72 A function extension that creates a function extension frame incorporating the given function extension identifier. A frame generation process 73, a light emission stop command for stopping the light emission of the light emitting means for signal transmission provided in each of the devices under the function expansion frame generated by the function expansion frame generation process 73, and these After the light emission of the light emitting means is stopped by the above-described light emission stop command, any one of the light emission permission commands for allowing the light emission is selected and incorporated, and one of the subordinate devices is set as the destination in the function expansion communication path described above. And sending out the function expansion frame for instructing to stop or permit the light emission of the light emitting means of the apparatus.

  FIG. 7 shows a claim correspondence diagram of the extended function execution program in another PON system of the present invention. The extended function execution program 80 in another PON system of the present invention is such that a computer of an ONU device that is star-connected to an OLT device via an optical coupler is synchronized with the execution of the discovery process by the OLT device. When a unique function extension identifier is given to the ONU device as its own device for the formed function extension communication channel, the function extension identifier storing process 81 for holding the function extension identifier and the function extension identifier described above are incorporated into the OLT device. When the function extension frame is sent, the function extension identifier is extracted from the function extension frame and compared with the function extension identifier stored in the own apparatus. It is determined that the comparison result is identical between the identifier comparison process 82 and the function extension identifier comparison process 82. The a command extraction process 83 to extract the commands from the extended frame, is characterized by causing the command extracted by the command extracting process 83 is executed and a command execution process 84 to be executed in its own device when the.

  <Embodiment of the Invention>

  Next, an embodiment of the present invention will be described.

FIG. 8 shows a configuration of a GE-PON system according to an embodiment of the present invention. The GE-PON system 200 according to the present embodiment includes an OLT device 202 connected to a host device 201, an optical fiber cable 204 that connects the OLT device 202 and the optical coupler 203, an optical coupler 203, and first to third devices. and the ONU 205 ₁ to 205 ₃ to the first to third optical fiber cable 206 _{1-206 3} connected respectively, connected separately one by one to the first to third ONU 205 ₁ to 205 ₃ It comprises first to third terminal devices 207 _{1 to} 207 ₃ .

Here, the OLT device 202 includes a frame buffer unit 211 that temporarily stores bidirectional frames, and an SNI termination unit 212 that converts the format of signals transferred between the frame buffer unit 211 and the host device 201. The PON termination unit 213, the optical / electrical conversion unit 214 disposed between the PON termination unit 213 and the optical fiber cable 204 and converting the optical signal and the electrical signal, and maintenance and control of the GE-PON system 200 are performed. The system control part 215 to perform is provided. The PON terminator 213 transfers the frame between the optical / electrical converter 214 and the LL ID identifying unit 221 that detects the LL ID included in the frame, and the LL ID identifying unit 221 and each frame. Transfer and frame transmission source or destination MAC unit 222-226 and MAC unit 222 mutually transfer the frame, add the function of MPCP unit 228 in IEEE (Institute of Electrical and Electronic Engineers) 802.3ah The extension unit 227, the MAC units 223 to 226, the extension unit 227, and the MPCP for transferring the respective frames to each other and performing link setting and uplink communication control with the first to third ONU devices 205 _{1 to} 205 ₃ Unit 228 and an OAM unit that analyzes and generates an OAM frame by transferring an OAM frame to and from this MPCP unit 228 And a 29 Metropolitan.

The first to third ONU apparatuses 205 _{1 to} 205 ₃ have substantially the same configuration. Therefore, the configuration of the first ONU device 205 ₁ will be described representatively. The first ONU device 205 ₁ includes an optical / electrical conversion unit 241 that mutually converts an optical signal and an electrical signal, a PON termination unit 242 that transfers the optical / electrical conversion unit 241 and a frame, and a PON termination unit. A frame buffer unit 243 that connects one end of the unit 242 to temporarily store a frame and transfers a frame to and from the other end side; a format of a signal transferred to the frame buffer unit 243; The terminal unit 207 ₁ includes a UNI terminal unit 244 that converts the format of signals transferred to each other, and a control circuit 245 that transfers signals to and from the PON terminal unit 242 to maintain and control the ONU device 205 _1. ing.

  Here, the PON terminator 242 transfers the frame between the optical / electrical converter 241 and the LL ID identifying unit 251 that detects the LL ID included in the frame, and the LL ID identifying unit 251 and each frame. MAC unit 252 to 254 that is a transmission source or destination of a frame, an extension unit 255 that transfers a frame to and from the MAC unit 252, and adds the function of the MPCP unit 256 in IEEE 802.3ah, and a MAC Units 253 and 254 and the extension unit 255 and the respective frames are transferred to each other, the MPCP unit 256 that controls the link setting with the OLT device 202 and the uplink communication, and the MPCP unit 256 transfers the frames to each other. , And an OAM unit 257 for analyzing and generating an OAM frame.

In the GE-PON system 200, a system control unit 215 in the OLT device 202 and a control circuit 245 in the _first to third ONU devices 205 _{1 to} 205 ₃ are both a CPU (Central Processing Unit) and a CPU (not shown). A memory (not shown) that stores a control program to be executed is also provided. Each component in the OLT device 202 and each component in the first to third ONU devices 205 _{1 to} 205 ₃ are not necessarily configured by hardware, and at least a part of them is the control program described above. It may be realized by a software component obtained by executing the above.

Next, the operation of the GE-PON system 200 having such a configuration will be described. Since the first to third ONU apparatuses 205 _{1 to} 205 ₃ perform the same operation, the first ONU apparatus 205 ₁ will be described as an example here.

  First, the operation of the OLT device 202 will be described. In downlink communication, the optical / electrical conversion unit 214 converts the electrical signal transmitted from the PON termination unit 213 into an optical signal and transmits the optical signal to the optical fiber cable 204. In uplink communication, an optical signal transmitted from the optical fiber cable 204 is converted into an electrical signal and transferred to the PON termination unit 213.

  The PON terminator 213 performs communication path establishment and uplink frame control in the GE-PON system 200. In downlink communication, the PON terminator 213 sequentially transfers the OAM frame generated from the frame stored in the frame buffer 211 and the signal transmitted from the system controller 215 to the optical / electrical converter 214. . In upstream communication, the PON termination unit 213 analyzes the frame transferred from the optical / electrical conversion unit 214. In the case of a normal data signal, the PON termination unit 213 transfers this frame to the frame buffer unit 211, and in the case of a maintenance OAM frame, transfers information in the frame to the system control unit 215.

  The frame buffer unit 211 waits for the order of frame transfer to the PON terminator 213 in downlink communication and frame transfer to the SNI terminator 212 in uplink communication. For this reason, the frame is temporarily stored.

  In the case of downlink communication, the SNI termination unit 212 decodes the frame transmitted from the host device 201 and converts it into a digital signal that can be processed by the PON termination unit 213. In the case of uplink communication, the SNI termination unit 212 performs encoding suitable for transmitting the digital signal transferred from the PON termination unit 213 to the higher-level device 201 and transmits the digital signal.

The system control unit 215 monitors the entire GE-PON system 200 and controls the system. When performing the first control of the ONU 205 _1, the system control unit 215, and transfer the information to the OAM unit 229, to generate the OAM frame. The system control unit 215, was analyzed by the OAM portion 229 reads the information of the OAM frame transmitted from the first ONU 205 _1, performs appropriate control.

FIG. 9 shows the state of signal processing between the PON terminal portions of the OLT device and the ONU device extracted. 9 representatively shows the PON terminator 242 in the first and second ONU devices 205 ₁ and 205 ₂ among the first to _third ONU devices 205 _{1 to} 205 3 shown in FIG. Yes. The optical / electrical converters 214 and 241 and the optical coupler 203 shown in FIG. 8 are not shown. In addition, in order to distinguish each component of the PON terminator 242 of the first ONU device 205 ₁ and the second ONU device 205 ₂ , each component of the first ONU device 205 ₁ is appended with their reference numerals. The letter “1” is attached, and the component parts of the _second ONU device 205 ₂ are given the suffix “2” to their reference numerals. The inside of the PON termination unit 213 in the OLT device 202 will be specifically described with reference to FIGS. 9 and 8. However, in order to avoid complicated explanation, the subscripts “1” and “2” are omitted as appropriate in the following text.

The LL ID identifying unit 221 in the OLT device 202 is one of the first to third ONU devices 205 _{1 to} 205 ₃ (here, the first ONU device 205 ₁ will be described mainly) as a GE-PON system 200. , The LL ID value is determined so that the LL ID is not duplicated in the subordinate first ONU device 205 ₁ , and is managed in association with the MAC units 222 to 226. In the case of downlink communication, the LL ID identifying unit 221 determines the destination for each transmission frame, embeds the LL ID corresponding to the _first ONU device 205 ₁ in the preamble portion of the frame, and sends it to the optical / electrical conversion unit 214. Forward. Further, in the case of uplink communication, the LL ID identification unit 221 identifies the transmission source by detecting the LL ID included in the preamble portion of the frame transferred from the optical / electrical conversion unit 214, and the corresponding MAC unit 222. Forward to ~ 226.

  Of the MAC units 222 to 226, the MAC unit 222 is for multicast (MULTICAST) LL ID allocation. In the case of downlink communication, the MAC unit 222 transfers the frame transferred from the MPCP unit 228 via the extension unit 227 to the LL ID identification unit 221. Further, in the case of uplink communication, the MAC unit 222 transfers the frame transferred from the LL ID identifying unit 221 to the MAC unit 222 to the MPCP unit 228 via the extension unit 227.

  The MAC unit 223 is for normal LL ID assignment. In the case of downlink communication, the MAC unit 223 transfers a frame using the MAC unit 223 from the MPCP unit 228 as a transmission source to the LL ID identifying unit 221. In the case of uplink communication, the MAC unit 223 transfers the frame transferred from the LL ID identifying unit 221 to the MAC unit 223 to the MPCP unit 228. In the case of the MAC units 224 to 226, the same processing as in the case of the MAC unit 223 is performed.

The MPCP unit 228 performs automatic detection of the _first ONU device 2051 connected to the GE-PON system. Then, the MPCP unit 228 performs a discovery process for assigning a conventional LL ID, and registers the _first ONU device 2051. The MPCP unit 228 periodically sends a gate frame to each conventional LL ID so that signals sent from the _first to third ONU devices 205 _{1 to} 205 ₃ do not collide in uplink communication. Then, the transmission timing of each communication path between the MAC units 222 to 226 and the MAC units 252 to 254 is controlled. Information regarding the transmission start time and the transmission amount is stored in the gate frame. Further, MPCP unit 228, by receiving the first to third report frame from the ONU 205 ₁ to 205 ₃ for the gate frame, maintains the logical link.

  In the case of normal downlink communication, the MPCP unit 228 transfers the frame to the LL ID identifying unit 221 using any one of the MAC units 223 to 226 as a transmission source. A frame having the MAC unit 222 as a transmission source is transferred to the extension unit 227. In the case of uplink communication, the MPCP unit 228 analyzes the frames transferred from the MAC units 223 to 226 and the extension unit 227, sends a frame sent to the higher-level device 201 to the frame buffer unit 211, and sends an OAM frame to the OAM unit. Transfer to 229.

The OAM unit 229 generates an OAM frame in accordance with an instruction from the system control unit 215. Also, the OAM unit 229 analyzes the upstream OAM frame and transfers the information to the system control unit 215. OAM unit 229, also ₁ of the emission stop first ONU apparatus 205, the light-emission enable and, the OAM frame including the light emitting permanently stop command, the MPCP unit 228, MAC unit 222 via the extended portion 227 from the transfer first to the ONU 205 _1. A normal OAM frame uses either the MAC unit 222 via the extension unit 227 or the MAC units 223 to 226 as a transmission source.

As long as the first ONU device 205 ₁ is connected under the control of the OLT device 202, the extension unit 227 causes the MAC unit 222 to maintain the IEEE 802. The function to be controlled according to 3ah is expanded. Also, extension portion 227 imparts the ONU ID as a unique identifier to the first to third ONU 205 ₁ to 205 ₃ connected under the OLT device 202, manages the ONU ID. When transmitting the OAM frame, the extension unit 227 assigns an ONU ID, and transfers the MAC unit 222 to the LL ID identification unit 221 using the transmission unit as a transmission source.

It will now be described with reference to FIG. 8, the operation of the first ONU 205 ₁ of each section.

Optoelectronic conversion unit 241, when the downlink communication, and transfers the first optical signal transmitted from the optical fiber cable 206 ₁ into an electric signal to the PON terminating unit 242. In the case of uplink communication, the optical / electrical converter 241 converts the electrical signal transferred from the PON terminator 242 into an optical signal only during a period permitted by the PON terminator 242 and performs the first optical fiber cable 206 _1. Transmit to.

  The PON termination unit 242 establishes a communication path and controls an upstream frame in the GE-PON system 200. In downstream communication, the PON termination unit 242 analyzes the frame transferred from the optical / electrical conversion unit 241, and transfers this to the frame buffer unit 243 in the case of a normal data signal. As a result of the frame analysis, in the case of the maintenance OAM frame, the PON termination unit 242 transfers the information in the frame to the control circuit 245. In the case of uplink communication, the PON termination unit 242 transfers the frame stored in the frame buffer unit 243 and the OAM frame generated from the signal transmitted from the control circuit 245 to the optical / electrical conversion unit 241.

  The frame buffer unit 243 temporarily stores frames in order to wait for the order of transfer to the UNI termination unit 244 in downlink communication and transfer to the PON termination unit 242 in uplink communication.

In the case of downlink communication, the UNI terminating unit 244 performs encoding suitable for transmission to the _first terminal device 2071. For uplink communications, UNI termination unit 244, a signal transmitted from the first terminal equipment 207 ₁ decodes, converts the PON terminating unit 242 can process digital signal, and transfers thereto.

The control circuit 245 in accordance with commands contained in the OAM frame to the first control of the ONU 205 _1.

  Next, the inside of the PON termination unit 242 will be described in detail.

The LL ID identifying unit 251 associates and manages the MAC units 252 to 254 corresponding to the LL ID given when the first ONU device 205 ₁ is connected to the GE-PON system 200. In downlink communication, the LL ID identification unit 251 detects the LL ID included in the preamble portion of the frame received from the optical / electrical conversion unit 241, and transmits the frame when addressed to the own device, but not when addressed to the own device. , Discard the frame. In the case of uplink communication, the LL ID identification unit 251 embeds the LL ID assigned to the MAC part of the frame transmission source in the preamble part of the frame and sends it to the optical / electrical conversion unit 214.

  The MAC unit 252 is for assigning a multicast / LL ID (see FIG. 9). In the case of downlink communication, the MAC unit 252 transfers the frame transferred from the LL ID identification unit 251 to the MPCP unit 256 via the extension unit 255. In the case of uplink communication, the MAC unit 252 transfers a frame using the MAC unit 252 transmitted from the MPCP unit 256 via the extension unit 255 as a transmission source to the LL ID identifying unit 251.

  The MAC unit 253 is for normal LL ID assignment. In the case of downlink communication, the MAC unit 253 transfers the frame transferred from the LL ID identifying unit 251 to the MAC unit 253 to the MPCP unit 256. In uplink communication, a frame using the MAC unit 253 from the MPCP unit 256 as a transmission source is transferred to the LL ID identifying unit 251. The MAC unit 254 is also used for normal LL ID assignment, and performs the same processing as the MAC unit 253.

The MPCP unit 256 performs processing in a discovery process for assigning a conventional LL ID to connect to the GE-PON system 200. Further, the MPCP unit 256 analyzes the gate frame transmitted from the MPCP unit 228 in the PON termination unit 213 of the OLT device 202 for each conventional LL ID, and within a determined time and transmission amount, Data stored in the frame buffer unit 243 or a report frame is transmitted to the LL ID identifying unit 251 using any one of the MAC units 252 to 254 associated with the destination LL ID of the gate frame as a transmission source. In the case of downlink communication, the MPCP unit 256 analyzes the frames addressed to the MAC units 253 and 254 and the frame transferred from the extension unit 255, and sends the frame sent to the _first terminal device 2071 to the frame buffer unit 243. The OAM frame is transferred to the OAM unit 257.

As long as the first ONU device 205 ₁ is connected under the control of the OLT device 202, the extension unit 255 allows the MAC unit 252 to maintain the maintenance multicast / LL ID (see FIG. 9). The function that the MPCP unit 256 controls according to IEEE 802.3ah is expanded. Also, the ONU ID given from the extension unit 227 in the PON termination unit 213 of the OLT device 202 is managed. When receiving the downlink OAM frame, the extension unit 255 analyzes the ONU ID in the OAM frame, and determines whether it is destined for the own device or not. If it is not addressed to the own device, the extension unit 255 discards the frame. If the address is addressed to the own device, the extension unit 255 transfers the frame to the MPCP unit 256.

  The OAM unit 257 analyzes the OAM frame transmitted from the OAM unit 229 in the PON termination unit 213 of the OLT device 202 and transfers it to the control circuit 245. Further, the OAM unit 257 generates an OAM frame according to the OAM frame transmitted from the OAM unit 229 or the instruction from the control circuit 245 and transfers the generated OAM frame to the MPCP unit 256.

FIG. 10 and FIG. 11 show the state of processing for establishing a communication path between the OLT device and the ONU device. Among these, FIG. 10 shows a discovery process for registering a normal LL ID, which is the same as the conventional one. FIG. 11 shows a discovery process for registering a multicast LL ID, which is unique to this embodiment. The establishment of a communication path between the OLT device 202 and the first ONU device 205 ₁ will be described in detail with reference to FIGS. 10, 11, and 8.

First, the discovery process for registering the normal LL ID shown in FIG. 10 will be described. As in the prior art, in the GE-PON system 200 of the present embodiment, the first ONU device 205 ₁ is connected to the OLT device 202 via the optical fiber cable 204, the optical coupler 203, and the first optical fiber cable 206 _1. It shall be connected. In this case, MPCP unit 228 of the OLT 202 side periodically discovery gate (Discovery Gate) - frame of the received first ONU 205 ₁ to be transmitted (step S301).

  After waiting for a random time from this reception, the MPCP unit 256 transmits a register request frame for requesting LL ID registration using the MAC unit 253 as a transmission source (step S302). The MPCP unit 228 that has received the register request frame transmits a register frame to assign an LL ID to the MAC unit 253 that has transmitted the register request frame (step S303). The MPCP unit 256 that has received the register frame addressed to the MAC unit 253 registers the given LL ID via the MAC unit 253 and the LL ID identification unit 251. Thereafter, a register ACK (Register ACK (ACKnowledgement)) for notifying that LL ID registration has been completed within the time and period indicated by the gate frame (step S304) transmitted from the MPCP unit 228. -A frame is transmitted (step S305).

By carried out over process between OLT device 202 and the first ONU 205 _1, logical link for communication is established between the MAC 223 and MAC unit 253. If necessary, a logical link for communication is also established between the MAC unit 224 and the MAC unit 254 by such a process. Note that the OLT device 202 and the first to third ONU devices 205 _{1 to} 205 ₃ have a plurality of “MAC units”. In the present embodiment, as an example, five are arranged in the OLT device 202 and three are arranged in each of the _first to third ONU devices 205 _{1 to} 205 ₃ .

FIG. 11 shows a discovery process for registering a multicast LL ID as an extended function added to the conventional function shown in FIG. 10 in the GE-PON system 200 of the present embodiment. This discovery process, MPCP unit 228 of the OLT 202 side regularly first ONU 205 ₁ receives a discovery gate frame to be transmitted (step S321). On the other hand, the expansion unit 255 uses the maintenance multicast / LL ID assignment MAC unit 252 as a transmission source, the communication path by the maintenance multicast / LL ID, and the first to third ONU devices 205 ₁ to 205 ₁ . 205 ₃ given only one for the register request frame requesting the same GE-PON that no unique identifier that overlap in the system (ONU ID), and transmits (step S322).

  FIG. 12 shows the structure of this register request frame. In the register request frame, “Multicast LL ID Request” is assigned to the head of the “Pad / Reserved” portion, and a value for requesting a multicast / LL ID for maintenance is embedded. Here, “Multicast LL ID Request” and “Pad / Reserved” may not exceed 38 bytes in total. FIG. 12 shows an example in which the “Multicast LL ID Request” for maintenance is 1 byte.

Returning to FIGS. 8 and 11, the description will be continued. The extension unit 227 on the OLT device 202 side that has received the register request frame in step S322 in FIG. 11 sends the maintenance request to the MAC unit 252 on the _first ONU device 2051 side that has transmitted the register request frame. A register frame is transmitted to assign a predetermined multicast / LL ID and ONU ID for maintenance using the MAC unit 222 for multicast / LL ID allocation as a transmission source (step S323). At the same time, the extension unit 227 registers and manages the MAC unit 252 to which the ONU ID and the ONU ID are assigned in association with each other unless the OLT device 202 is restarted, the light emission permission command is transmitted, or the light emission permanent stop command is transmitted. To do. However, when the ONU ID associated with the MAC unit 252 that has transmitted the register request frame has already been registered, the maintenance multicast / LL ID and ONU ID are assigned after clearing it once.

  FIG. 13 shows the structure of the register frame. From FIG. 13, the “Multicast LL ID” for maintenance is embedded in the “Assigned port” part defined in the conventional register frame, and in addition to this, at the top of the “Pad / Reserved” part. , “ONU ID” is embedded. Here, “ONU ID” and “Pad / Reserved” may not exceed 34 bytes in total.

Returning to FIGS. 8 and 11, the description will be continued. Upon receiving the register frame in step S323, the extension unit 255 registers the given maintenance multicast / LL ID in the LL ID identification unit 251 via the MAC unit 252. The first ONU 205 ₁ restart or reception of the light-emission enable command or, unless the reception of the light emitting permanently stop command, extended portion 255 registers and manages the ONU ID.

Through the above process, a communication path based on the multicast / LL ID for maintenance is established between the MAC unit 222 on the OLT device 202 side and the MAC unit 252 on the _first ONU device 2051 side. FIG. 8 shows a case where the first to third ONU devices 205 _{1 to} 205 ₃ are connected to the OLT device 202 and the respective communication paths are established in the same manner.

Next, a description will be given logical communication path of the OLT 202 and the first ONU 205 ₁ with reference to FIGS.

Referring to FIG. 9, a logical communication path established by the above process is shown. In FIG. 9, the MAC units 223 and 224 on the OLT device 202 side and the MAC units 253 and 254 on the _first ONU device 2051 side are the LL ID identification unit 221 and the first ONU device 205 on the OLT device 202 side. The LL ID identification unit 251 on the ₁ side, the optical fiber cable 204, and the first optical fiber cable 206 ₁ are connected to each other by point-to-point communication LL IDs # 1 to # 4. .

On the other hand, the MAC unit 222 on the OLT device 202 side and the MAC unit 252 on the _first ONU device 2051 side perform the point-to-multicast by the process of registering the multicast / LL ID for maintenance. Connected with points. The optical fiber cable 204 and the first optical fiber cable 206 ₁ are physically one communication path, but there are logically a plurality of communication paths. The second ONU device 205 ₂ shown in FIG. 8 has the same connection configuration, and FIG. 9 shows an example of five communication paths in the OLT device 202 and the first and second ONU devices 205 ₁ and 205 ₂ . Yes.

In downlink communication, the LL ID identifying unit 221 embeds and transmits the LL ID corresponding to the destination MAC address of the frame in the preamble portion of the frame. When transmitting a frame to the MAC unit 253, LL ID # 1 is embedded. The frame transmitted from the OLT device 202 reaches all of the _first to third ONU devices 205 _{1 to} 205 ₃ , but is discarded by the LL ID identifying unit 251 if it is not addressed to the own device. When addressed to the own device, the LL ID is removed and transferred to the MAC unit corresponding to the assigned LL ID, and transmitted to the frame buffer unit 243 in FIG. 8 via the MPCP unit 256. .

In uplink communication, the MPCP unit 228 on the OLT device 202 side controls frame transmission from the _first to third ONU devices 205 _{1 to} 205 ₃ . The MPCP unit 228 on the OLT device 202 side periodically sends a gate frame that designates a transmission permission time and a permission data amount to each LL ID of the first to _third ONU devices 205 _{1 to} 205 3 connected to the OLT device 202. To send. The MPCP unit 256 that has received the gate frame passes the MAC frame 253 or the MAC unit 254 through the MAC unit 253 or the report frame for requesting transmission with the transmission amount specified by the gate frame at the time specified by the gate frame. To the LL ID identifying unit 251. The LL ID identifying unit 251 embeds an LL ID corresponding to the MAC part of the transmission source in the preamble part of the frame and transmits it. When a frame is transmitted from the MAC unit 253, LL ID # 1 is embedded. The LL ID identifying unit 221 on the OLT device 202 side that has received the frame detects the embedded LL ID, transfers it to the corresponding MAC unit, and passes through the MPCP unit 228 to the frame buffer unit 211 in FIG. Send to. For example, the frame in which LL ID # 1 is embedded is transferred to the MAC unit 223.

The MPCP unit 228 on the OLT device 202 side periodically transmits a gate frame to the multicast / LL ID, but the extension unit 255 on the _first ONU device 2051 side does not send uplink data or a report frame. In the first ONU device 205 ₁ , the extension unit 255 periodically receives a gate frame addressed to the multicast / LL ID for maintenance to maintain a pseudo link, and registers and manages the ONU ID. to continue. Normally, the extension unit 227 on the OLT device 202 side does not receive the uplink data or the report frame transmitted by the MPCP unit 256, but continues to transmit the gate frame, thereby making a pseudo-multicast / LL ID A simple link and continue to register and manage ONU IDs. FIG. 9 shows an example in which the first and second ONU devices 205 ₁ and 205 ₂ are connected to the OLT device 202, but the third ONU device 205 ₃ also has the same function. is doing.

  FIG. 14 shows a state of processing of the OLT device when a failure that seems to be a constant light emission of the optical transmitter occurs. This will be described with reference to FIG.

When the OLT device 202 detects that a failure that seems to be a constant light emission of any one of the _first to third ONU devices 205 _{1 to} 205 ₃ has occurred in the GE-PON system 200 (step S341: Y) Send an OAM frame including a command to stop light emission to the suspect ONU device. Assume here, the suspect ONU apparatus from the first ONU 205 _1. At this time, the OLT device 202 generates an OAM frame including a command for stopping light emission in the OAM unit 229 (step S342), and transfers the OAM frame to the extension unit 227 via the MPCP unit 228.

The extensions 227, in order to identify the suspect ONU apparatus, in this example to impart ONU ID given to the first ONU 205 ₁ (step S343). Then, with the MAC unit 222 as a transmission source, the LL ID identifying unit 221 assigns a multicast / LL ID for maintenance, and then transmits (step S344), and ends the process (end).

  FIG. 15 shows the structure of an OAM frame transmitted from the OLT device at this time. The ONU ID and the command (Command) are embedded at the top of the “Data / Pad” portion of the OAM frame. In the OAM frame shown in FIG. 15, “ONU ID”, “Command”, and “Data / Pad” need not exceed 1496 bytes in total. In the example shown in FIG. 15, “ONU ID” and “Command” are both 1 byte.

FIG. 16 shows the processing of the first ONU device that has received the OAM frame from the OLT device. When the first ONU device 205 ₁ receives the OAM frame from the OLT device 202 (step S361: Y), the LL ID identifying unit 251 that has received the OAM frame is a frame addressed to the multicast / LL ID for maintenance. Is transferred to the extension unit 255 via the MAC unit 252. The extension unit 255 compares the ONU ID embedded in the OAM frame with the ONU ID given to itself to determine whether it is addressed to itself (step S362). As a result, when it is determined that it is not addressed to the own apparatus (N), the frame is discarded (step S363), and the process is ended (END).

  On the other hand, if it is determined that the OAM frame is addressed to the own apparatus (step S362: Y), the identifier called ONU ID is removed and then transferred to the OAM unit 257 via the MPCP unit 256 (step S364). . The OAM unit 257 analyzes the frame and transfers only the command to the control circuit 245. In accordance with the command, the control circuit 245 turns off the power switch of the optical / electrical converter 241 (step S365).

FIG. 17 shows an optical / electrical converter in the first ONU device and a peripheral circuit for stopping the light emission. The optical / electrical converter 241 is individually provided by a multiplexer 261 having one end connected to the _first optical fiber cable 2061, and first to third power control signals 271 to 273 output from the control circuit 245. First to third switches 281 to 283 that are on / off controlled are provided.

  The first switch 281 has one contact point grounded and the other contact point connected to the anode of the light emitting diode 262. The cathode of the light emitting diode 262 is connected to the output side of the driver 263 that drives the light emitting diode 262. The output light 264 of the light emitting diode 262 becomes an input of a multiplexing unit 261 that multiplexes optical signals. The first power supply control signal 271 turns on / off the contact piece of the first switch 281.

  The second switch 282 has one contact point grounded and the other contact point connected to the output side of the driver 263. The second power supply control signal 272 causes the contact piece of the second switch 282 to be turned on / off. Upstream data 266 and an optical output control signal 267 are supplied to the driver 263 from the PON termination unit 242.

  The third switch 283 has one contact point grounded and the other contact point connected to the receiver 268. The third power supply control signal 273 turns on and off the contact piece of the third switch 283. A photodiode 276 that receives input light 275 output from the multiplexing unit 261 is disposed on the input side of the receiver 268. The anode of the photodiode 276 is grounded, and a signal 277 obtained by converting an optical signal into an electric signal is input to the receiver 268 from the cathode. Downstream data 278 is input from the receiver 268 to the PON termination unit 242.

  The control circuit 245 communicates with the OAM unit 257 of the PON terminator 242 and reads / writes data from / to the non-volatile memory circuit 279 including a non-volatile memory. The nonvolatile memory circuit 279 includes first and second power control signals 271 and 272 that control on / off of the first and second switches 281 and 282 that control power supply to the light emitting diode 262 and the driver 263. Stores an output control flag. When the output control flag is set, the contact pieces of the first and second switches 281 and 282 are turned off with respect to these settings.

Returning to FIG. 16, the description will be continued with reference to FIG. Returning to step S365, description will be given. The OAM unit 257 analyzes the downlink data 278 sent from the receiver 268 from the OLT device 202, and transfers only the command to the control circuit 245. The control circuit 245 turns off the first or second switch 281 or 282 of the optical / electrical converter 241 in accordance with the light emission stop command from the OLT device 202 in step S342 (FIG. 14). Thus, the first ONU 205 ₁ of the light emitting is stopped (step S366).

Due to this light emission stop, the first ONU device 105 ₁ cannot send a report message for the gate message. For this reason, the LL IDs # 1 and # 2 shown in FIG. 9 are disconnected, and the series of processing shown in FIG. 16 ends (end). However, the downstream communication path from the OLT device 202 is maintained unless the third switch 283 on the receiver 268 side shown in FIG. 17 is turned off. Accordingly, even in this state, the extension unit 255 of the _first ONU device 205 ₁ can receive only the frame addressed to the maintenance multicast / LL ID.

FIG. 18 shows a state of a logical communication path in the GE-PON system when the first ONU device described above is in a light emission stop state. In this figure, the same parts as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. Here, an example is shown in which a light emission stop command is sent to the PON terminator 242 _{1 of} the first ONU device 205 ₁ . As can be seen from comparison with FIG. 9, the LL IDs # 1 and # 2 corresponding to the _first ONU device 205 ₁ are disconnected, but the LL ID # corresponding to the _second ONU device 205 ₂ is disconnected. 3 and # 4 are linked.

  FIG. 19 shows a state of processing of the OLT device for the first ONU device whose light emission is stopped. This will be described with reference to FIG.

In the state where the light emission of the first ONU device 205 ₁ is stopped in step S366 of FIG. 16, the OLT device 202 permits the light emission of the _first ONU device 205 ₁ again or the light emission is permanent as long as a failure occurs. Will be stopped. Here, a case to allow the first light emitting of the ONU 205 ₁ again. The case where light emission is stopped permanently will be described later using the same FIG. When the light emission of the first ONU device 205 ₁ is permitted again, the OLT device 202 generates an OAM frame including a command for permitting the light emission (step S381). The OLT device 202 transfers this OAM frame to the extension unit 227 via the MPCP unit 228. The extension unit 227 assigns the ONU ID given to the ONU device whose light emission is stopped to the OAM frame (step S382). This OAM frame is issued after a multicast / LL ID for maintenance is assigned by the LL ID identifying unit 221 using the MAC unit 222 as a transmission source (step S383). When the extension unit 227 sends a command permitting light emission, the extension unit 227 clears the ONU ID assigned to the _first ONU device 2051 as the destination ONU device (step S384), and ends the processing (end). .

  The OAM frame transmitted in step S383 has the configuration already shown in FIG. “ONU ID” and “Command” are embedded at the head of the “Data / Pad” portion of the OAM frame. It is sufficient that the “ONU ID”, “Command”, and “Data / Pad” do not exceed 1496 bytes in total. FIG. 15 shows a case where both “ONU ID” and “Command” are 1 byte.

  FIG. 20 shows a state of processing of the first ONU device when an OAM frame is received in a state where light emission is stopped. This will be described with reference to FIGS. 17 and 18.

When the first ONU device 205 ₁ receives the OAM frame from the OLT device 202 (step S401: Y), the LL ID identifying unit 251 ₁ that has received the OAM frame uses the frame addressed to the multicast / LL ID for maintenance. If it is identified, the OAM frame is transferred to the extension unit 255 ₁ via the MAC unit 252 ₁ . The extension unit 255 ₁ compares the ONU ID embedded in the OAM frame with the ONU ID given to itself to determine whether it is addressed to itself (step S402). As a result, when it is determined that it is not addressed to its own device (N), the frame is discarded (step S403), and the processing is ended (END).

On the other hand, when it is determined that the OAM frame is addressed to the own apparatus (step S402: Y), the identifier called ONU ID is removed, and this is sent to the OAM unit 257 ₁ via the MPCP unit 256 _1. The OAM frame is transferred (step S404). The OAM unit 257 ₁ analyzes the frame, and discards the ONU ID given to the extension unit 255 ₁ when the command is a light emission permission of the ONU device (step S405: Y). Also, the OAM unit 257 ₁ causes the LL ID identifying unit 251 to discard the multicast / LL ID via the MAC unit 252 (step S406).

Subsequently, the OAM unit 257 ₁ transfers only this command for permitting light emission to the control circuit 245 ₁ . Control circuit 245 ₁ has received the command, in accordance with the command to turn on the first and second switches 281, 282 shown in FIG. 17 (step S407). Thereby, the light emission of the first ONU device 205 ₁ is permitted (step S408), and the process of permitting the light emission to the _first ONU device 105 ₁ ends (end). That is, Since then, the uplink data 266 from the PON terminating unit 242 emits light emitting diode 262 is supplied to the driver 263, via the newly discovery process, the first ONU 205 ₁ again, the multicast-LL ID and ONU An ID is given.

  Next, with reference to FIGS. 19 and 20, a description will be given of frame transfer including a command for setting the OLT device so as not to emit light again even if the ONU device is restarted. This will be described with reference to FIGS. 17 and 18.

  The OAM unit 229 of the OLT device 202 generates an OAM frame including a command for permanently stopping the light emission (step S381 in FIG. 19), and transfers the frame to the extension unit 227 via the MPCP unit 228. The extension unit 227 assigns an ONU ID for which light emission is stopped (step S382), and uses the MAC unit 222 as a transmission source to assign a multicast / LL ID for maintenance in the LL ID identification unit 221 for transmission (step). S383).

  The OAM frame transmitted in step S383 has the configuration already shown in FIG. “ONU ID” and “Command” are embedded at the head of the “Data / Pad” portion of the OAM frame. It is sufficient that the “ONU ID”, “Command”, and “Data / Pad” do not exceed 1496 bytes in total. FIG. 15 shows a case where both “ONU ID” and “Command” are 1 byte.

When the extension unit 227 sends a command to permanently stop the light emission, the extension unit 227 clears the ONU ID assigned to the _first ONU device 2051 as the destination ONU device (step S384), and ends the processing (end). ).

Furthermore, the state of processing of the first ONU device when an OAM frame is received when a command for permanently stopping light emission is sent will be described with reference to FIG. When the LL ID identifying unit 251 _{1 that} has received this OAM frame identifies it as a frame addressed to the multicast / LL ID for maintenance, the LL ID identifying unit 251 ₁ transfers the OAM frame to the extending unit 255 ₁ via the MAC unit 252. The extension unit 255 ₁ compares the ONU ID embedded in the OAM frame with the ONU ID given to itself to determine whether it is addressed to itself (step S402). As a result, when it is determined that it is not addressed to its own device (N), the frame is discarded (step S403), and the processing is ended (END).

On the other hand, when it is determined that the OAM frame is addressed to the own apparatus (step S402: Y), the identifier called ONU ID is removed, and this is sent to the OAM unit 257 ₁ via the MPCP unit 256 _1. The OAM frame is transferred (step S404). The OAM unit 257 ₁ analyzes the frame, and when the command is a permanent stop of light emission of the ONU device (step S405: N), the extension unit 255 ₁ discards the multicast / LL ID and the ONU ID (step S409).

Subsequently, the OAM unit 257 ₁ transfers only this command for permanently stopping the light emission to the control circuit 245 ₁ . Control circuit 245 ₁ has received the command, in accordance with the command, a flag in the nonvolatile memory circuit 279 shown in FIG. 17 (step S410). At this time, the third switch 283 on the receiver 268 side of the optical / electrical converter 241 shown in FIG. 17 may be turned off. Thereafter, when the first ONU device 205 ₁ is restarted, the control circuit 245 monitors the non-volatile memory circuit 279, and when the flag is set, the first and second power supply for the light emitting diode 262 and the driver 263 are supplied. If the switches 281 and 282 are not turned on, the light emission is permanently stopped (step S411). Thus the process of permanently stopping the light emission for the first ONU 205 ₁ is completed (end).

  As described above, the GE-PON system 200 of the present embodiment has the following effects. First, according to the present embodiment, a downlink logical link can be constantly maintained. As a result, the OLT device 202 has a first effect that it can send a command for permitting the light emission again to the ONU device 205 forcibly stopping the light emission. In addition, the OLT device has a second effect that a command for permanently stopping the light emission can be sent to the ONU device forcibly stopping the light emission.

  Further, according to the present embodiment, multicast / LL ID is used. Therefore, in this embodiment, there is a third effect that it is not necessary to prepare a plurality of MAC units to be set in the OLT device for maintenance.

  <Modification of the present invention>

FIG. 21 illustrates a configuration of a main part of the GE-PON system in the modification of the embodiment described above. The GE-PON system 200A of this modification uses broadcast (BroadCast) / LL ID when sending an OAM command. Therefore, in the PON termination unit 213A on the OLT device 202A side, the MAC unit 222 for multicast / LL ID assignment shown in FIG. 9 is changed to the MAC unit 222A for broadcast / LL ID, and the MAC units 223 to ,... Are changed to MAC units 223A to 226A,..., And the extension unit 227 is changed to the extension unit 227A. Further, the PON terminators 242 ₁ A and 242 ₂ A on the first to third ONU devices 205 ₁ A to 205 ₃ A (only the first and second ONU devices are shown in FIG. 21) are shown in FIG. The MAC units 252 ₁ and 252 ₂ for multicast / LL ID assignment shown in FIG. 9 are changed to MAC units 252 ₁ A and 252 ₂ A for broadcast and LL ID, and the MAC units 253 ₁ , 254 ₁ ,. or MAC unit 253 _2, 254 _2, ... a MAC unit 253 ₁ a, 254 ₁ a, ..., or 253 ₂ a, 254 ₂ a, is changed to ..., extension 255 _1, 255 ₂ is extended Part 255 ₁ A, 255 ₂ A.

In GE-PON system 200A of this modification, all the MAC unit 222A~226A present in OLT device 202A and the first ONU apparatus 205 ₁ A, the MAC unit 252 ₁ A~254 ₁ A, normal LL Assign an ID. The extension unit 227A is connected between each of the MAC units 222A to 226A and the MPCP unit 228, and expands the function that the MPCP unit 228 controls according to IEEE 802.3ah for all the MAC units 222A to 226A of the OLT device 202A. To do. Further, the extension unit 227A assigns and manages an ONU ID to the _first ONU device 205 ₁ A connected under the OLT device 202A.

When the OLT device 202A transmits an OAM frame, an ONU ID is assigned and transmitted to a maintenance broadcast / LL ID. At this time, even if the logical links of the MAC unit 222A and the MAC unit 252 ₁ A and the MAC unit 223A and the MAC unit 253 ₁ A are disconnected, the data is transmitted to the broadcast / LL ID.

Similarly, the extension unit 255 ₁ A is connected between each of the MAC units 252 ₁ A to 254 ₁ A,... And the MPCP unit 256, and all the MAC units 252 ₁ A to 252 ₁ A of the first ONU device 205 ₁ A are connected. 254 ₁ A,..., The function that the MPCP unit 256 ₁ controls according to IEEE 802.3ah is extended. The extension unit 255 ₁ A manages the ONU ID given by the extension unit 227A. Further, when the extension unit 255 ₁ A receives the OAM frame, the extension unit 255 ₁ A analyzes the ONU ID in the OAM frame and determines whether it is destined for the own device or not. At this time, the extension unit 255 ₁ A receives the frame addressed to the broadcast / LL ID even if the logical links of the MAC unit 222A and the MAC unit 252 ₁ A and the MAC unit 223A and the MAC unit 253 ₁ A are disconnected. The same applies to the other ONU devices 205A.

Next, the establishment of the communication path between the OLT device 202A and the first ONU device 205 ₁ A of this modification will be described with reference to FIG.

When the first ONU device 205 ₁ is connected to the GE-PON system 200A, the first ONU is detected with respect to the discovery gate frame (step S301 in FIG. 10) transmitted by the MPCP unit 228 on the OLT device 202A side. The MPCP unit 256 ₁ on the device 205 ₁ A side transmits a register request frame (step S302 in FIG. 10). At this time, only one extension unit 255 ₁ A is given to the first to _third ONU devices 205 ₁ A to 205 ₃ A and is a unique identifier that does not overlap in the same GE-PON system 200A. Embed a command requesting (ONU ID). However, there is one MAC unit for transmitting a register request frame in which this command is embedded for one ONU device. In this modification, an example in which the MAC unit 252 ₁ A sends is shown. If the ONU ID has already been registered, the registered ONU ID is once cleared and then a register request frame is transmitted. Here, the configuration of the register request frame is the same as that of the above-described embodiment.

The extension unit 227A that has received the register request frame including the command requesting the ONU ID embeds the ONU ID in the register frame sent out by the MPCP unit 228, and sets the logical link with the MAC unit 252 ₁ A 222A is transmitted as a transmission source (step S303 in FIG. 10). However, if the ONU ID associated with the MAC unit 252 ₁ A has already been registered, the registered ONU ID is once cleared and a register frame in which the ONU ID is newly embedded is transmitted. Here, the configuration of the register frame is the same as that of the previous embodiment.

When the extension unit 255 ₁ A receives the register frame, the extension unit 255 ₁ A extracts the given ONU ID from the ONU ID unit in the frame and sends the register request frame again or the first ONU device 205 ₁ A This ONU ID is registered and managed until the device is restarted, the light emission permission command is received, or the light emission permanent stop command is received. Thereafter, a register ACK frame indicating that the MPCP unit 256 ₁ has registered the LL ID at the time determined by the gate frame (step S304 in FIG. 10) sent from the MPCP unit 228 is sent to the MAC unit 252. ₁ A is transmitted as a transmission source (step S305 in FIG. 10). At this time, the extension unit 255 ₁ A embeds the ONU ID in the register, ACK, and frame.

  FIG. 22 shows the structure of the register, ACK, and frame in this modification. The ONU ID is embedded at the head of the “Pad / Reserved” portion of the register, ACK (Register ACK), or frame. FIG. 22 shows an example in which “ONU ID” is 1 byte. In this example, the total of “ONU ID” and “Pad / Reserved” portions may not exceed 35 bytes.

Returning to FIG. 21, the description will be continued. The extension unit 227A that has received the register / ACK / frame in which the ONU ID is embedded detects that the first ONU device 205 ₁ A has registered the ONU ID, and the ONU ID embedded in the register / ACK / frame. And the MAC unit 252 ₁ A, which is the transmission source of this frame, is associated and managed. Thereafter, the registered MAC unit 252 ₁ A receives a register request frame requesting the ONU ID again, or the OLT device 202A is restarted, or the first ONU device 205 ₁ A is allowed to emit light. The ONU ID is registered and managed until a command is sent or a command for permanently stopping light emission is sent.

  Next, a procedure for sending an OAM frame using a broadcast / LL ID will be described with reference to FIG.

Assume that the OLT device 202A sends a light emission stop, light emission permission, or light emission permanent stop command to the first ONU device 205 ₁ A. In this case, an OAM frame including a command is generated by the OAM unit 229 and transferred to the extension unit 227A via the MPCP unit 228. The extension unit 227A embeds the ONU ID of the suspicious ONU device in the OAM frame, sends all the MAC units 222A to 226A,... To the transmission source after the broadcast / LL ID is assigned by the LL ID identification unit 221. . This suspicious ONU device is assumed to be a first ONU device 205 ₁ A here.

In this case, when the LL ID identifying unit 251 ₁ A of the first ONU device 205 ₁ A identifies that the received OAM frame is addressed to the broadcast / LL ID, the LL ID is removed and each MAC unit 252 ₁ A, The OAM frame is transferred to the extension unit 255 ₁ A via the MAC unit 253 ₁ A. Upon receiving the OAM frame addressed to the broadcast / LL ID, the extension unit 255 ₁ A detects the ONU ID in the OAM frame and discards it if it is not addressed to the own apparatus. When the OAM frame is addressed to the own apparatus, the extension unit 255 ₁ A removes the ONU ID and then transfers the OAM frame to the OAM unit 257 ₁ via the MPCP unit 256 ₁ . Further, the extension unit 255 ₁ A discards the ONU ID when the OAM frame includes a command to permit light emission or to stop light emission permanently.

  The subsequent operation of the circuit for controlling the light emission in the optical / electrical converter 241 shown in FIG. 17 is the same as that of the embodiment already described. For this reason, description of this part is omitted.

In the embodiment of the present invention described above, the first and second switches 281 and 282 are both turned on / off, but only one of them may be on / off controlled. Further, depending on the circuit configuration, the arrangement of one of the first and second switches 281 and 282 can be omitted. The same applies to the modification of the present invention. Further, in the embodiment, the GE-PON system 200 is configured by using a total of three of the _first to third ONU devices 205 _{1 to} 205 ₃ , but this is for simplifying the drawing. Of course, the number of ONU devices 205 is not limited to this.

It is a claim correspondence diagram of the PON system of the present invention. It is a claim corresponding | compatible figure of the other PON system of this invention. It is a claim corresponding | compatible figure of the ONU apparatus of this invention. It is a claim corresponding | compatible figure of the extended function execution method in the PON system of this invention. It is a claim corresponding | compatible figure of the extended function execution method in the other PON system of this invention. It is a claim corresponding | compatible figure of the extended function execution program in the PON system of this invention. It is a claim corresponding | compatible figure of the extended function execution program in the other PON system of this invention. 1 is a system configuration diagram showing a configuration of a GE-PON system according to an embodiment of the present invention. It is principal part explanatory drawing which extracted and showed the PON termination | terminus part of the OLT apparatus and ONU apparatus in this Embodiment. It is explanatory drawing of the discovery process which registers normal LL ID in this Embodiment. It is explanatory drawing which showed the discovery process which registers multicast LL ID in this Embodiment. It is explanatory drawing showing the structure of the register | resistor request frame of this Embodiment. It is explanatory drawing showing the structure of the register frame of this Embodiment. It is a flowchart which shows the process of the OLT apparatus when the failure considered to be always light emission of the optical transmitter occurs in this embodiment. It is explanatory drawing which showed the structure of the OAM frame sent out from an OLT apparatus in this Embodiment. It is a flowchart showing the process of the 1st ONU apparatus which received the OAM frame from the OLT apparatus in this Embodiment. It is the block diagram which showed the peripheral circuit for stopping the optical / electrical conversion part and its light emission in a 1st ONU apparatus in this Embodiment. It is principal part explanatory drawing which showed the state of the logical communication path | route of a GE-PON system when the 1st ONU apparatus will be in the light emission stop state in this Embodiment. It is a flowchart showing the process of the OLT apparatus with respect to the 1st ONU apparatus in which light emission has stopped in this Embodiment. It is a flowchart showing the process of the 1st ONU apparatus at the time of OAM frame reception in the state which light emission has stopped in this Embodiment. It is principal part explanatory drawing which shows the principal part of the GE-PON system in the modification of this Embodiment. It is explanatory drawing showing the structure of the register | resistor ACK frame in this modification. It is a system configuration figure showing an example of the composition of the GE-PON system in the 1st related art of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 20 PON system 11, 21, 202, 202A OLT apparatus 12, 22, 30, 205, 205A ONU apparatus 31 Light emission means 32 Function expansion frame reception means 33 Command extraction means 34 Uplink communication control switch 35 Uplink communication control Switch control means 40, 50 Extended function execution method in PON system 41, 51 Discovery process execution step 42, 52 Function expansion communication path formation step 43, 53 Function expansion frame creation step 44, 54 Function expansion frame transmission step 45 , 55 Function expansion frame reception step 46, 56 Function expansion identifier comparison step 47 Extended function identifier extraction step 48 Extended function execution step 57 Command extraction step 58 Light emission stop step 59 Function expansion communication path maintenance Step 60 Light emission return step 70, 80 Extended function execution program in PON system 71 Discovery process execution process 72 Function expansion communication path formation process 73 Function expansion frame creation process 74 Function expansion frame transmission process 81 Function expansion identifier storage process 82 Function expansion identifier comparison process 83 Command extraction process 84 Command execution process 200, 200A GE-PON system 201 Host device 203 Optical coupler 204, 206 Optical fiber cable 207 Terminal device 213, 242 PON terminator 214, 241 Optical / electrical conversion 221 251 LL ID identification unit 222-226, 222A-226A, 252-254, 252A-254A MAC unit 228, 256 MPCP unit 229, 257 OAM
262 Light emitting diode 263 Driver 276 Photodiode 279 Non-volatile memory circuit 281 First switch 282 Second switch 283 Third switch

Claims (10)

Discovery process execution means for executing a discovery process for setting communication paths for a plurality of subordinate devices that are star-connected via an optical coupler, and in accordance with the execution of the discovery process by the discovery process execution means A function expansion communication path forming means for forming a function expansion communication path for the plurality of subordinate devices, and giving a unique function expansion identifier to each of the apparatuses, and the function expansion communication path forming means. Function expansion frame creating means for creating a function expansion frame incorporating the function expansion identifier given to any of a plurality of subordinate apparatuses in which a function expansion communication path is formed; An extension function identifier representing a function extended to the function extension frame created by the function extension frame creation means And the OLT apparatus having a function expansion frame transmitting means for transmitting to one of said plurality of subordinate devices in the extension communication path to the destination incorporates,
From the subordinate apparatus, the function expansion frame receiving means for receiving the function expansion frame when it is sent from the OLT apparatus, and the function expansion frame received by the function expansion frame receiving means When the identifier for function expansion is extracted and compared with the identifier for function expansion that compares it with the identifier for function expansion given from the OLT device to the own device, the identifier for comparing function expansion matches. When it is determined, an extended function identifier extracting means for extracting the extended function identifier from the function extension frame received by the function extension frame receiving means, and an extended function indicated by the extended function identifier extracted by the extended function identifier extracting means A PON system comprising a plurality of ONU devices each having an extended function execution means for executing Discovery process execution means for executing a discovery process for setting communication paths for a plurality of subordinate devices that are star-connected via an optical coupler, and in accordance with the execution of the discovery process by the discovery process execution means A function expansion communication path forming means for forming a function expansion communication path for the plurality of subordinate devices, and giving a unique function expansion identifier to each of the apparatuses, and the function expansion communication path forming means. Function expansion frame creating means for creating a function expansion frame incorporating the function expansion identifier given to any of the plurality of subordinate apparatuses in which the function expansion communication path is formed; The function expansion frame created by the function expansion frame creation means is individually provided in the subordinate apparatus. The function expansion by selecting and incorporating either a light emission stop command for stopping light emission of the light emitting means for signal transmission and a light emission permission command for permitting light emission after light emission of these light emitting means is stopped by the light emission stop command An OLT device comprising a function extension frame sending means for sending one of the plurality of subordinate devices to the communication path as a destination;
From the subordinate apparatus, the function expansion frame receiving means for receiving the function expansion frame when it is sent from the OLT apparatus, and the function expansion frame received by the function expansion frame receiving means When the identifier for function expansion is extracted and compared with the identifier for function expansion that compares it with the identifier for function expansion given from the OLT device to the own device, the identifier for comparing function expansion matches. When the determination is made, the command extraction means for extracting the command from the function extension frame received by the function extension frame receiving means, and when the command extracted by the command extraction means is the light emission stop command, A light emission stop means for stopping light emission, and after the light emission stop means stops light emission of the light emission means. While the light receiving means constituting the function extending frame receiving means is in a state capable of receiving light, the function extending communication path is maintained by holding the function expanding communication path to hold the light receiving function by the light receiving means. And a light emission return means for returning to a state in which light emission is possible when light emission of the light emission means of the device is stopped by the light emission stop means when the command extracted by the command extraction means is the light emission permission command And a plurality of ONU devices including the PON system. A light emitting means for performing light emission control to transmit a frame composed of optical signals to the OLT device in a time zone assigned to the device;
A function expansion frame for receiving a function expansion frame incorporating a command such as a light emission stop command for stopping light emission itself of the light emitting means or a light emission permission command for permitting light emission control after light emission is stopped from the OLT device. Receiving means;
Command extraction means for extracting the command by capturing the function expansion frame received by the function expansion frame receiving means when the function expansion frame is addressed to the own apparatus;
An uplink communication control switch for controlling on / off of communication addressed to the OLT device by light emission control of the light emitting means;
When the command extraction means extracts the light emission stop command, the uplink communication control switch is turned off to stop communication of the frame, while when the command extraction means extracts the light emission permission command, the uplink communication control An ONU apparatus comprising: an upstream communication control switch control unit that turns on a switch and permits communication of the frame.   4. The ONU apparatus according to claim 3, wherein the uplink communication control switch is a switch for turning on / off a driving power source of a light emitting diode constituting the light emitting means.   4. The ONU apparatus according to claim 3, wherein the upstream communication control switch is a switch for turning on / off a power supply switch for a driver circuit of a light emitting diode constituting the light emitting means.   Whether or not the function expansion frame is addressed to the own apparatus is determined by the ONU ID incorporated in the frame addressed to the multicast / LL ID (Logical Link identifier) for function expansion or the broadcast / LL ID from the OLT apparatus. The ONU device according to claim 3. A discovery process execution step for executing, in the OLT device, a discovery process for setting communication paths for a plurality of subordinate devices that are star-connected via an optical coupler;
A function for forming a function expansion communication path for ONU devices as subordinate devices in accordance with the execution of the discovery process in the discovery process execution step, and giving each device a unique function expansion identifier. An expansion channel forming step;
A function expansion frame for creating a function expansion frame incorporating the function expansion identifier given to any of the apparatuses having the function expansion communication path formed by the function expansion communication path forming step. Frame creation step,
A function extension in which an extension function identifier representing an extended function is incorporated into the function extension frame created in the function extension frame creation step and is sent to the function extension communication path with one of the subordinate devices as a destination. Frame sending step,
In the ONU device as the subordinate device, a function expansion frame receiving step for receiving a function expansion frame when it is sent from the OLT device in the function expansion frame transmission step;
The function extension identifier is extracted from the function extension frame received in the function extension frame reception step, and the function extension identifier is compared with the function extension identifier given to the own apparatus from the OLT apparatus. An identifier comparison step;
An extension function identifier extracting step for extracting the extension function identifier from the function extension frame received in the function extension frame receiving step when it is determined that the comparison result is the same in the function extension identifier comparison step;
An extended function execution step in which an extended function indicated by the extended function identifier extracted in the extended function identifier extraction step is executed by an ONU device as one of the subordinate devices. Execution method. A discovery process execution step for executing, in the OLT device, a discovery process for setting communication paths for a plurality of subordinate devices that are star-connected via an optical coupler;
A function for forming a function expansion communication path for ONU devices as subordinate devices in accordance with the execution of the discovery process in the discovery process execution step, and giving each device a unique function expansion identifier. An expansion channel forming step;
A function expansion frame for creating a function expansion frame incorporating the function expansion identifier given to any of the apparatuses having the function expansion communication path formed by the function expansion communication path forming step. Frame creation step,
A light emission stop command for stopping the light emission of the light emitting means for signal transmission individually provided in the subordinate apparatus in the function expansion frame created by the function expansion frame creating step, and the light emission of these light emitting means is the light emission A function expansion frame transmission step of selecting and incorporating any of the light emission permission commands for permitting light emission after being stopped by the stop command and transmitting one of the subordinate devices to the function expansion channel. When,
In the ONU device as one of the subordinate devices, a function expansion frame receiving step for receiving the function expansion frame when it is sent from the OLT device;
The function extension identifier is extracted from the function extension frame received in the function extension frame reception step, and the function extension identifier is compared with the function extension identifier given to the own apparatus from the OLT apparatus. An identifier comparison step;
A command extraction step of extracting a command from the function extension frame received in the function extension frame reception step when it is determined that the comparison result is matched in the function extension identifier comparison step;
A light emission stop step for stopping light emission of the light emitting means of the own device when the command extracted in this command extraction step is the light emission stop command;
The function of holding the light receiving function by the light receiving means by holding the function expansion communication path while maintaining the state in which light emission can be received even after the light emission of the light emitting means is stopped in the light emission stopping step. An expansion channel holding step;
A light emission return step for returning to a state in which light emission is possible when light emission of the light emitting means of the device is stopped by the light emission stop step when the command extracted in the command extraction step is the light emission permission command. An extended function execution method in a PON system. The computer of the OLT device
A discovery process execution process for executing a discovery process for setting a communication path for a plurality of ONU devices under the star connection via an optical coupler;
In accordance with the execution of the discovery process by the discovery process execution process, a function expansion communication path is formed for the plurality of subordinate ONU devices, and a unique function expansion identifier is given to these devices. Communication channel formation processing,
A function expansion frame is created by incorporating the function expansion identifier given to any one of the plurality of ONU apparatuses having the function expansion communication path formed by the function expansion communication path forming process. Function expansion frame creation processing,
A light emission stop command for stopping the light emission of the light emitting means for signal transmission individually provided in the subordinate apparatus in the function expansion frame created by the function expansion frame creation processing, and the light emission of these light emission means is the light emission By selecting and incorporating one of the light emission permission commands for allowing the light emission after being stopped by the stop command and sending one of the subordinate devices to the function expansion communication path as a destination, the light emission of the device is performed. An extended function execution program in a PON system that executes a function expansion frame transmission process for instructing stop or permission of light emission of the means. A computer of an ONU device that is star-connected via an OLT device and an optical coupler,
When the OLT device gives a unique function expansion identifier to the ONU device as its own device for the function expansion communication path formed in accordance with the discovery process execution by the discovery process execution processing, the function expansion identifier is retained. Save processing and
When the OLT device sends a function expansion frame incorporating the function expansion identifier, the function expansion identifier extracted from the function expansion frame and stored in the device An extension identifier comparison process for comparing whether or not they match,
A command extraction process for extracting a command from the extension frame when it is determined that the comparison results match in the function extension identifier comparison process;
An extended function execution program in a PON system that executes a command execution process for executing a command extracted by the command extraction process on its own device.

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