WO2018173166A1 - Station-side device and communication method - Google Patents

Station-side device and communication method Download PDF

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Publication number
WO2018173166A1
WO2018173166A1 PCT/JP2017/011529 JP2017011529W WO2018173166A1 WO 2018173166 A1 WO2018173166 A1 WO 2018173166A1 JP 2017011529 W JP2017011529 W JP 2017011529W WO 2018173166 A1 WO2018173166 A1 WO 2018173166A1
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WO
WIPO (PCT)
Prior art keywords
standby
unit
optical
frame
pon
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PCT/JP2017/011529
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French (fr)
Japanese (ja)
Inventor
和典 岡田
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2017/011529 priority Critical patent/WO2018173166A1/en
Publication of WO2018173166A1 publication Critical patent/WO2018173166A1/en

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  • the present invention relates to a station side apparatus and a communication method used in a PON (Passive Optical Network) system.
  • PON Passive Optical Network
  • the PON system includes a station side device (hereinafter referred to as OLT (Optical Line Terminal)) and a user side device (hereinafter referred to as ONU (Optical Network Unit)).
  • OLT Optical Line Terminal
  • ONU Optical Network Unit
  • the OLT has a plurality of PON function units, and a plurality of ONUs are connected to one PON function unit.
  • GE-PON Gigabit Ethernet (registered trademark) -PON
  • 10G-EPON 10 Gigabit-Ethernet PON
  • the next-generation PON system has a redundant function that enables system switching when a communication failure occurs, in addition to the functions of the current PON system.
  • an N: 1 redundant configuration with N normal systems and one standby system generally, means for adding an optical switch with an N: 1 configuration is taken.
  • the power budget indicating the difference between the optical output of the transmitter and the light receiving sensitivity of the counter receiver is reduced as much as the optical loss generated in the optical switch as a whole PON system.
  • the ONU since the ONU is a user device, it is difficult to replace the device due to the system revision. That is, if an optical switch is added in an environment where an ONU that cannot be replaced is installed, the power budget of the entire PON system is reduced by the amount of optical loss generated by the optical switch, and the transmittable distance is shortened.
  • Patent Document 1 provides a redundant configuration by providing a frame selection / separation unit at the subsequent stage of the optical transceiver to secure a standby PON function unit.
  • a technique for suppressing the occurrence of optical loss is disclosed.
  • the OLT described in Patent Document 1 has a problem that the optical transmitter / receiver that is most likely to fail is not in a redundant configuration and therefore is not in a redundant configuration that assumes actual operation.
  • the main purpose of the OLT described in Patent Document 1 is to reduce the system cost, and to minimize the number of PON function units, one frame selection / separation unit processes all lines together. Yes.
  • the frame selection / separation unit has a complicated and high-performance configuration including multiple stages of selectors, and is not suitable for an N: 1 redundant configuration.
  • the present invention has been made in view of the above, and an object of the present invention is to obtain a station-side device capable of suppressing occurrence of optical loss while having a redundancy function suitable for actual operation.
  • the station apparatus converts an upstream communication frame from an optical signal to an electrical signal, and converts a downstream communication frame from an electrical signal to an optical signal.
  • a plurality of standby optical transceivers, and an electrical switch that is connected to one of the plurality of standby optical transceivers and establishes a communication path between the one standby optical transceiver and the upper network.
  • the station side device generates a frame of an electric signal using data acquired from the host network as an alternative to the normal transmission / reception unit in which an abnormality is detected among a plurality of normal transmission / reception units used during normal operation.
  • the standby frame processing unit performs frame processing based on the control information, and the electrical switch selects a standby optical transceiver to be connected based on the identification information.
  • the station side apparatus according to the present invention has an effect that the occurrence of optical loss can be suppressed while having a redundancy function suitable for actual operation.
  • FIG. 2 is a block diagram showing a configuration example of an OLT according to the first embodiment.
  • 1 is a diagram illustrating an example of a hardware configuration of an OLT according to a first embodiment; Flowchart showing operation of OLT according to the first exemplary embodiment.
  • FIG. 3 is a block diagram showing a configuration example of an OLT according to the second embodiment.
  • FIG. 6 is a block diagram showing a configuration example of an OLT according to the third embodiment.
  • FIG. 1 is a block diagram showing a configuration example of the OLT 2 according to the first embodiment of the present invention.
  • the OLT 2 is connected to the L2 switch 1 and the ONUs 3-1 to 3-Z.
  • Z is an integer of 2 or more.
  • the OLT 2 is a station-side device installed in a station that manages the PON system 10 including the OLT 2 and the ONUs 3-1 to 3-Z.
  • the PON system 10 transmits signals from the upper network to the ONUs 3-1 to 3-Z via the L2 switch 1 and the OLT 2 in downlink communication, and signals from the ONUs 3-1 to 3-Z in uplink communication.
  • the data is transmitted to the upper network via the OLT 2 and the L2 switch 1.
  • the L2 switch 1 transfers main signal data between the upper network and the OLT 2 according to the designated communication route.
  • the L2 switch 1 selects and transfers the main signal data received from the upper network by selecting one of the PON function units 22-1 to 22-N when the communication route passes through the normal system.
  • the selector unit 23 is selected and transferred.
  • N is an integer of 2 or more.
  • the L2 switch 1 receives main signal data from any of the PON function units 22-1 to 22-N when the communication route passes through the normal system, and selects the selector when the communication route passes through the standby system.
  • the main signal data is received from the unit 23, and the received main signal data is transferred to the upper network.
  • the main signal data may be simply referred to as data.
  • ONUs 3-1 to 3-Z are user side devices that are assumed to be connected to a terminal device such as a personal computer.
  • the ONUs 3-1 to 3-Z transmit and receive an optical signal frame including main signal data to and from the OLT 2 using a unique number such as a MAC (Media Access Control) address assigned to the ONU 3-1.
  • MAC Media Access Control
  • the configuration of OLT 2 will be described.
  • the OLT 2 includes a control unit 21, PON function units 22-1 to 22-N, and a selector unit 23.
  • Each of the PON function units 22-1 to 22-N includes a MAC control unit 221 and an optical transceiver 222.
  • the selector unit 23 includes a standby PON function unit 24, a standby PON management unit 28, and optical couplers 29-1 to 29-N.
  • the backup PON function unit 24 includes a backup MAC control unit 25, an electrical switch 26, and optical transceivers 27-1 to 27-N.
  • the standby PON management unit 28 includes a MAC management unit 281, a switch management unit 282, and an optical transceiver management unit 283.
  • the PON function unit 22-1 to 22-N When the PON function units 22-1 to 22-N, the optical transceivers 27-1 to 27-N, and the optical couplers 29-1 to 29-N are not distinguished, the PON function unit 22, the optical transceiver 27, and Sometimes referred to as an optical coupler 29.
  • the control unit 21 controls the operation of the entire OLT 2 and manages the state of the OLT 2.
  • the control unit 21 checks whether there is an abnormality in the PON function units 22-1 to 22-N, and manages the state of the PON function units 22-1 to 22-N.
  • the control unit 21 detects that an abnormality has occurred in any of the PON function units 22-1 to 22-N, the authentication information, the ONU authentication state, and the ONU alarm for the PON function unit 22 in which the abnormality has been detected.
  • the MAC information including the information is notified to the MAC management unit 281 of the standby PON management unit 28.
  • the control unit 21 notifies the switch management unit 282 of the standby PON management unit 28 of identification information for identifying the PON function unit 22 in which an abnormality has been detected.
  • the MAC information may be simply referred to as control information.
  • the PON function units 22-1 to 22-N are normal transmission / reception units used at normal times.
  • the OLT 2 includes N PON function units 22.
  • the MAC control unit 221 generates a frame by adding the MAC information of the opposite ONU 3 to be transmitted to the downlink main signal data acquired from the L2 switch 1 based on the preset MAC information of the opposite ONU 3 It is a processing unit.
  • the MAC control unit 221 outputs the generated frame to the optical transceiver 222.
  • the MAC control unit 221 identifies the frame from which the opposite ONU 3 is based on the preset MAC information of the opposite ONU 3 with respect to the upstream frame acquired from the optical transceiver 222, and the MAC information from the frame And main signal data is extracted.
  • the MAC control unit 221 outputs the main signal data extracted from the frame to the L2 switch 1.
  • the optical transceiver 222 converts the frame acquired from the MAC control unit 221 from an electrical signal to an optical signal, and transmits the converted optical signal frame to the opposite ONU 3 via the connected optical coupler 29.
  • the optical transceiver 222 converts the optical signal frame received from the opposite ONU 3 via the optical coupler 29 into an electrical signal frame, and outputs the frame to the connected MAC control unit 221.
  • the optical transceiver 222 is, for example, XFP (10 Gbit / s Small Form Factor Pluggable), SFP (Small Form Factor Pluggable), SFP + (Small Form Factor Pluggable Plus), and the like.
  • the optical coupler 29 distributes and transmits the normal system downstream signal, that is, the frame of the optical signal generated by the PON function unit 22, to each ONU 3.
  • the optical coupler 29 aggregates and branches to the PON function unit 22 with respect to the normal uplink signal, that is, the time-division multiplexed optical signal received from each ONU 3.
  • the standby PON function unit 24 adds the MAC information of the opposite ONU 3 to be transmitted to the backup downstream signal, that is, the electrical signal acquired from the L2 switch 1, in the same manner as the PON function unit 22.
  • the optical coupler 29 distributes the frame of the optical signal acquired from the standby PON function unit 24 and transmits it to each ONU 3.
  • the optical coupler 29 aggregates and forwards the backup uplink signal, that is, the optical signal received from each ONU 3, to the backup PON function unit 24.
  • the standby PON function unit 24 converts an optical signal frame into an electric signal frame, identifies which frame the opposite ONU 3 is from, and extracts MAC information and main signal data from the frame. .
  • the standby PON function unit 24 outputs the main signal data extracted from the frame to the L2 switch 1.
  • the standby PON function unit 24 replaces the PON function unit 22 in which an abnormality is detected based on the control of the standby PON management unit 28.
  • This is a standby transmission / reception unit that operates as a functional unit.
  • the standby MAC control unit 25 is the same as the operation performed when the MAC control unit 221 of the PON function unit 22 in which an abnormality is detected is normal based on the MAC information acquired from the MAC management unit 281 of the standby PON management unit 28. It is a frame processing unit that performs an operation.
  • the spare MAC control unit 25 generates an electric signal frame using main signal data acquired from the upper network via the L2 switch 1 as an alternative to the PON function unit 22 in which an abnormality is detected in the PON function unit 22. And output to the electrical switch 26. Further, the standby MAC control unit 25 extracts main signal data from the frame of the electrical signal acquired from the electrical switch 26 and performs frame processing to output to the upper network via the L2 switch 1.
  • the electrical switch 26 is connected to one of the optical transceivers 27-1 to 27-N and establishes a communication path between the one optical transceiver 27 and the upper network.
  • the electrical switch 26 selects the optical transceiver 27 to be connected based on the identification information acquired from the switch management unit 282 of the standby PON management unit 28, and switches the connection-destination optical transceiver 27.
  • the electrical switch 26 transfers an electrical signal between the standby MAC control unit 25 and the optical transceivers 27-1 to 27-N.
  • the electrical switch 26 includes a 10G transmission switch 261 used for transmitting a signal of the next-generation PON system, a 10G reception switch 262 used for receiving a signal of the next-generation PON system, and a signal transmission of the current PON system. 1G transmission switch 263 and 1G reception switch 264 used for receiving signals of the current PON system.
  • the electrical switch 26 includes a plurality of switches for transmitting a frame and a plurality of switches for receiving for each communication speed.
  • the electric switch 26 includes four types of switches inside, but is an example, and the types of switches included in the electric switch 26 are not limited thereto.
  • the optical transceivers 27-1 to 27-N are standby optical transceivers having the same functions as the optical transceiver 222 included in the PON function unit 22.
  • the optical transceivers 27-1 to 27-N convert an upstream communication frame from an optical signal to an electrical signal, and convert a downstream communication frame from an electrical signal to an optical signal.
  • the standby PON management unit 28 controls the operation of the standby PON function unit 24.
  • the standby PON management unit 28 acquires the MAC information and the identification information about the PON function unit 22 in which the abnormality is detected from the control unit 21, the standby PON function unit is used as an alternative to the PON function unit 22 in which the abnormality is detected. 24 is controlled to operate.
  • the MAC management unit 281 manages the operation of the standby MAC control unit 25.
  • the MAC management unit 281 notifies the standby MAC control unit 25 of the MAC information of the PON function unit 22 obtained from the control unit 21 in which an abnormality is detected.
  • the switch management unit 282 manages the operation of the electrical switch 26, that is, switching of the connection destination.
  • the switch management unit 282 notifies the electrical switch 26 of the identification information of the PON function unit 22 in which the abnormality is detected, acquired from the control unit 21.
  • the optical transceiver management unit 283 receives the transmission power when transmitting the optical signal frame, that is, the information on the transmission signal intensity, and the optical signal frame from each of the optical transceivers 27-1 to 27-N. Information on received power, that is, received signal strength is acquired.
  • the optical transceiver management unit 283 monitors the state of the optical transceiver 27 based on the transmission / reception power information acquired from each optical transceiver 27 and detects the presence / absence of an abnormality. If the optical transceiver management unit 283 determines that an abnormality has occurred in any of the optical transceivers 27, the optical transceiver management unit 283 notifies the controller 21 of the abnormality of the optical transceiver 27.
  • the optical transmitter / receiver management unit 283 uses a general technique such as a method of monitoring the back light of the laser diode inside the optical transmitter / receiver 27 as a method for checking the transmission power.
  • Each of the optical couplers 29-1 to 29 -N is connected to one PON function unit 22 that is different from the other optical couplers 29, and is connected to one optical transceiver 27 that is different from the other optical couplers 29. is doing.
  • Each of the optical couplers 29-1 to 29 -N aggregates the optical signals received from the ONU 3 and branches to the PON function unit 22 and the optical transceiver 27 that connect the optical signals.
  • Each of the optical couplers 29-1 to 29-N distributes the optical signal acquired from the PON function unit 22 or the optical transmitter / receiver 27 to be connected, and transmits the optical signal to each ONU 3.
  • FIG. 2 is a diagram illustrating an example of a hardware configuration of the OLT 2 according to the first embodiment.
  • the spare PON management unit 28, the spare MAC control unit 25, and the electrical switch 26 are newly required among the hardware configurations shown in FIG.
  • Each hardware of the control unit 21 and the PON function unit 22 is assumed to be diverted from the conventional system.
  • the OSS (Operation Support System) 9 for example, a system administrator performs a desired setting for each device through a medium such as a personal computer.
  • the OSS 9 manages the operation state of the PON system 10, specifically, grasps the abnormal state of each device.
  • the hardware of the electrical switch 26 is configured to include the hardware of the optical transmitter / receiver 27. However, this is only an example, and the electrical switch 26 and the optical transmitter / receiver 27 may be configured of separate hardware. Good.
  • the control unit 21 is realized by a processing circuit including a communication IF (InterFace) 101, a processor 102, a RAM (Random Access Memory) 103, a ROM (Read Only Memory) 104, and a communication IF 105.
  • the control unit 21 is realized by software, firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in the ROM 104.
  • the external communication IF 101 transfers the instruction signal to the processor 102.
  • the processor 102 uses the work area of the RAM 103 and transmits a control signal to each unit via the internal communication IF 105.
  • the processor 102 also receives response signals from the respective units via the communication IF 105 and processes them using the work area of the RAM 103 based on program information stored in the ROM 104 in advance.
  • the processor 102 is, for example, a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, and a DSP (Digital Signal Processor).
  • the ROM 104 is, for example, a nonvolatile or volatile semiconductor memory such as EPROM (Erasable Programmable Read Only Memory) or EEPROM (registered trademark) (Electrically Erasable Programmable Read Only Memory), a magnetic disk, a flexible disk, an optical disk, or a compact. Discs, minidiscs, and DVDs (Digital Versatile Disks).
  • the RAM 103 is, for example, a nonvolatile or volatile semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD.
  • the processing circuit for realizing the control unit 21 may be realized by dedicated hardware.
  • the processing circuit can be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or It is a combination of these.
  • the PON function unit 22 is realized by a processing circuit including a communication IF 201, a processor 202, a RAM 203, a ROM 204, and a photoelectric conversion circuit 205 as shown in FIG.
  • the photoelectric conversion circuit is described as “O / E (Optical / Electrical converter)” for the sake of brevity. The same applies to the photoelectric conversion circuit 503 described later.
  • the MAC control unit 221 is realized by the communication IF 201, the processor 202, the RAM 203, and the ROM 204.
  • the optical transceiver 222 is a photoelectric conversion circuit 205.
  • the communication IF unit 201 transfers the control signal received from the control unit 21 to the processor 202.
  • the processor 202 uses the work area of the RAM 203 based on program information stored in advance in the ROM 204, and performs processing of a frame processing circuit that generates, terminates, and transmits a frame.
  • the processor 202 notifies the control unit 21 of the frame processing result via the communication IF 201.
  • the OLT 2 actually includes N PON function units 22, FIG. 2 shows only one for the purpose of explaining an example of the hardware configuration. Specific examples of the processor 202, the RAM 203, and the ROM 204 are as described above.
  • the standby PON management unit 28 is realized by a processing circuit including a communication IF 301, a processor 302, a RAM 303, and a ROM 304.
  • the communication IF 301 transfers the control signal received from the control unit 21 to the processor 302.
  • the processor 302 uses the work area of the RAM 303 based on the program information stored in advance in the ROM 304, transmits the MAC information to the standby MAC control unit 25, and sends it to the electrical switch 26. Send identification information.
  • Specific examples of the processor 302, the RAM 303, and the ROM 304 are as described above.
  • the standby MAC control unit 25 is realized by a processing circuit including a communication IF 401, a processor 402, a RAM 403, and a ROM 404.
  • the communication IF 401 transfers the MAC information received from the standby PON management unit 28 to the processor 402.
  • the processor 402 uses the work area of the RAM 403 based on program information stored in advance in the ROM 404, and performs processing of a frame processing circuit that generates, terminates, and transmits a frame.
  • the processor 402 notifies the control unit 21 of the frame processing result via the communication IF 401.
  • Specific examples of the processor 402, the RAM 403, and the ROM 404 are as described above.
  • the electrical switch unit 26 is realized by a processing circuit including a communication IF 501, a selector circuit 502, and a photoelectric conversion circuit 503, as shown in FIG.
  • the 10G transmission switch 261, the 10G reception switch 262, the 1G transmission switch 263, and the 1G reception switch 264 are the selector circuit 502.
  • the optical transceiver 27 is a photoelectric conversion circuit 503.
  • the communication IF 501 transfers the identification information notified from the standby PON management unit 28 to the selector circuit 502.
  • the selector circuit 502 selects a switch number for each switch, that is, the photoelectric conversion circuit 503 to be connected based on the identification information.
  • the photoelectric conversion circuit 503 transmits information on transmission power and reception power to the standby PON management unit 28 via the communication IF 501.
  • the OLT 2 actually includes a plurality of selector circuits 502 and a photoelectric conversion circuit 503 for the electrical switch 26 and the optical transceiver 27, but FIG. 2 is a diagram for explaining an example
  • FIG. 3 is a flowchart of the operation of the OLT 2 according to the first embodiment.
  • a control signal including setting information is transmitted from the OSS 9 to the control unit 21 by a user operation or the like.
  • the control unit 21 reflects the setting information from the OSS 9 and also reflects the setting information in the PON function unit 22.
  • the control unit 21 also notifies the standby PON management unit 28 of the setting information, but the setting information processing method in the standby PON management unit 28 is not particularly limited. For example, when the setting information is terminated by itself, the backup PON management unit 28 does not notify the backup MAC control unit 25 and the electrical switch 26 of the setting information.
  • the spare MAC control unit 25 terminates all received frames and does not transfer them to the subsequent stage.
  • the backup MAC control unit 25 receives a signal indicating an abnormal state of the PON function unit 22. Since it is not the case, all received frames are terminated and not transferred to the subsequent stage.
  • the normal PON function unit 22 transfers the frame for both the upstream signal and the downstream signal after the setting information is reflected.
  • the control unit 21 monitors the state of the PON function unit 22 (step S1).
  • the control unit 21 determines that no abnormality has occurred in the PON function unit 22 (step S2: No), and continues to monitor the state of the PON function unit 22.
  • the PON function unit 22 cannot receive an upstream frame, and thus notifies the control unit 21 of the failure detection.
  • the control unit 21 determines that an abnormality has occurred in the PON function unit 22 (step S2: Yes), and the MAC information of the PON function unit 22 in which the abnormality is detected and The identification information is notified to the standby PON management unit 28 (step S3).
  • the control unit 21 notifies the OSS 9 of failure detection of the PON function unit 22 as necessary.
  • the MAC management unit 281 of the standby PON management unit 28 notifies the standby MAC control unit 25 of the MAC information of the PON function unit 22 in which an abnormality has been detected (step S4).
  • the switch management unit 282 of the standby PON management unit 28 notifies the electrical switch 26 of the identification information of the PON function unit 22 in which an abnormality has been detected (step S5).
  • the standby MAC control unit 25 performs frame processing based on the MAC information (step S6). Specifically, the backup MAC control unit 25 reflects the MAC information in the frame processing circuit and performs frame processing. The contents of the frame processing are as described above.
  • the electrical switch 26 selects the optical transceiver 27 to be connected based on the identification information (step S7). Specifically, the electrical switch 26 switches the selector circuit 502, that is, the 10G transmission switch 261, the 10G reception switch 262, the 1G transmission switch 263, and the 1G reception switch 264 to desired switch positions.
  • the standby PON function unit 24 establishes a standby communication route as hardware. Thereafter, the standby MAC control unit 25 notifies the control unit 21 of the result of the frame processing. The control unit 21 determines whether or not the standby PON function unit 24 is operating normally based on the frame processing result from the standby MAC control unit 25.
  • the processes in steps S4 and S6 and the processes in steps S5 and S7 may be performed in parallel.
  • the timing at which the OLT 2 performs the system switching process is not limited to the above example.
  • the OLT 2 may perform system switching by an external command from the OSS 9 or may perform system switching when an abnormality other than a hardware failure, for example, a desired frame is not transferred.
  • the application range of the system switching process in the OLT 2 is not limited to hardware failure.
  • the OLT 2 uses the electrical switch 26 without using the optical switch, and provides a plurality of optical transceivers 27 between the electrical switch 26 and the optical coupler 29.
  • the occurrence of optical loss can be suppressed.
  • the OLT 2 can maintain the power budget of the PON system 10 after diverting the ONU 3 already installed in the field.
  • the OLT 2 has a redundant configuration of the optical transceiver 27, which is the functional unit that is most likely to fail.
  • the OLT 2 has a simple configuration for realizing a redundant configuration assuming actual operation and an N: 1 redundant configuration.
  • the OLT 2 is generally used regardless of whether the PON system already installed in the field is a system that assigns an upstream signal wavelength band to each subscriber or a system that uses the same wavelength band and performs time division transmission. This configuration can be applied to various PON systems.
  • Embodiment 2 processing for reducing the power consumption of the optical transceiver of the selector unit will be described.
  • FIG. 4 is a block diagram of a configuration example of the OLT 2a according to the second embodiment.
  • the PON system 10a includes an OLT 2a and ONUs 3-1 to 3-Z.
  • the OLT 2a is obtained by replacing the selector unit 23 with the selector unit 23a with respect to the OLT 2 of the first embodiment.
  • the selector unit 23a includes a standby PON function unit 24a, a standby PON management unit 28a, and optical couplers 29-1 to 29-N.
  • the backup PON function unit 24a includes a backup MAC control unit 25, an electrical switch 26, and optical transceivers 27a-1 to 27a-N.
  • the standby PON management unit 28a includes a MAC management unit 281, a switch management unit 282a, and an optical transceiver management unit 283a.
  • optical transceivers 27a-1 to 27a-N When the optical transceivers 27a-1 to 27a-N are not distinguished, they may be referred to as optical transceivers 27a.
  • the switch management unit 282a notifies the optical transceiver management unit 283a of the identification information of the PON function unit 22 in which an abnormality is detected, in addition to the function of the switch management unit 282 of the first embodiment.
  • the optical transmitter / receiver manager 283a detects an optical transmitter / receiver 27a that has not been selected by the electrical switch 26 as a standby path based on the identification information, that is, an abnormality is detected. A standby instruction is notified to the optical transceiver 27a that is not operating as an alternative to the PON function unit 22, and the standby mode is set.
  • the optical transmitter / receiver 27a shifts to a standby mode with lower power consumption than the normal operation mode when a standby instruction is notified from the optical transmitter / receiver manager 283a.
  • the operation of other configurations is the same as that of the first embodiment.
  • the optical transceivers 27a-1 to 27a-N among the optical transceivers 27a-1 to 27a-N, the optical transceivers 27a other than the one optical transceiver 27a connected to the electrical switch 26 are set in the standby mode. Note that, when the OLT 2a is normal, that is, when all the PON function units 22 are operating normally, all the optical transceivers 27a may be in the standby mode.
  • the OLT 2a notifies the optical transceiver management unit 283a of identification information from the switch management unit 282a, and the optical transceiver management unit 283a controls the optical transceiver 27a.
  • the optical transceiver 27a not connected to the electrical switch 26 is set to the standby mode.
  • the OLT 2a can obtain the same effect as that of the first embodiment, and can reduce the power consumption of the optical transceiver 27a, that is, the selector unit 23a, as compared with the first embodiment.
  • the OLT 2a can extend the product life of the optical transceiver 27a, that is, the selector unit 23a, as compared with the first embodiment, by reducing the frequency of use of the optical transceiver 27a that is most likely to fail.
  • Embodiment 3 FIG. In the third embodiment, a process in which the standby PON management unit causes the standby PON function unit to perform self-diagnosis will be described.
  • FIG. 5 is a block diagram of a configuration example of the OLT 2b according to the third embodiment.
  • the PON system 10b includes an OLT 2b and ONUs 3-1 to 3-Z.
  • the OLT 2b is obtained by replacing the selector unit 23a with a selector unit 23b with respect to the OLT 2a of the second embodiment.
  • the selector unit 23b includes a standby PON function unit 24b, a standby PON management unit 28b, and optical couplers 29-1 to 29-N.
  • the backup PON function unit 24b includes a backup MAC control unit 25b, an electrical switch 26b, and optical transceivers 27b-1 to 27b-N.
  • the standby PON management unit 28b includes a MAC management unit 281b, a switch management unit 282b, an optical transceiver management unit 283b, and a self-diagnosis unit 284.
  • optical transceivers 27b-1 to 27b-N When the optical transceivers 27b-1 to 27b-N are not distinguished, they may be referred to as optical transceivers 27b.
  • the self-diagnosis unit 284 periodically checks whether there is an abnormality in the selector unit 23b, via the MAC management unit 281b, the switch management unit 282b, and the optical transceiver management unit 283b, that is, the standby PON function unit 24b, The standby MAC control unit 25b, the electrical switch 26b, and the optical transceiver 27b are made to perform self-diagnosis, and the control unit 21 is notified of the self-diagnosis execution result.
  • the MAC management unit 281b causes the standby MAC control unit 25b to perform self-diagnosis.
  • the standby MAC control unit 25b performs self-diagnosis under the control of the MAC management unit 281b in addition to the function of the standby MAC control unit 25.
  • the switch management unit 282b causes the electrical switch 26b to perform self-diagnosis in addition to the function of the switch management unit 282a. In addition to the function of the electrical switch 26, the electrical switch 26b performs self-diagnosis under the control of the switch management unit 282b.
  • the optical transceiver manager 283b causes the optical transceiver 27b to perform self-diagnosis in addition to the function of the optical transceiver manager 283a. In addition to the function of the optical transceiver 27a, the optical transceiver 27b performs self-diagnosis under the control of the optical transceiver manager 283b.
  • OLT 2b has a status of normal mode and self-diagnosis mode.
  • the OLT 2b performs the same operation as in the second embodiment in the normal mode.
  • the OLT 2 b enters the self-diagnosis mode at a late-night timing, for example, once a day, and performs self-diagnosis.
  • the self-diagnosis unit 284 In the self-diagnosis mode, in order to discard the main signal data from the L2 switch 1 and the main signal data to be output to the L2 switch 1, the self-diagnosis unit 284 sends the backup MAC control unit 25b via the MAC management unit 281b. A termination instruction is given to the terminal. Next, the self-diagnosis unit 284 assumes that the normal PON function units 22-1 to 22-N are in an abnormal state in order, and then sets the PON function to the standby MAC control unit 25b via the MAC management unit 281b. The MAC information of the units 22-1 to 22-N is notified sequentially.
  • the self-diagnosis unit 284 assumes that the normal PON function units 22-1 to 22-N are in an abnormal state in order, and connects the PON function unit 22- to the electrical switch 26b via the switch management unit 282b.
  • the identification information 1 to 22-N is sequentially notified.
  • the backup MAC control unit 25b and the electrical switch 26b have N patterns as alternatives to the PON function units 22-1 to 22-N, and the backup MAC control unit 25 and the electrical switch 26 of the first embodiment The same operation is performed.
  • the standby MAC control unit 25b notifies the self-diagnosis unit 284 of the standby PON management unit 28b of the frame processing result.
  • the optical transceiver management unit 283b may notify the self-diagnosis unit 284 of information on the transmission / reception power of the optical transceiver 27b in the normal mode that is not the standby mode as a self-diagnosis result.
  • the self-diagnosis unit 284 notifies the control unit 21 of the self-diagnosis result, that is, the diagnosis result of the backup route established by the selector unit 23b.
  • the OLT 2b performs self-diagnosis of the selector unit 23b under the control of the self-diagnosis unit 284. As a result, the OLT 2b can periodically determine whether the selector unit 23b is normal. In addition to the effects of the second embodiment, the OLT 2b can guarantee the function of each component of the selector unit 23b.
  • the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

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Abstract

The present invention is provided with: optical transceivers (27-1 to 27-N) for converting an uplink communication frame from an optical signal to an electric signal, and converting a downlink communication frame from an electric signal to an optical signal; an electric switch (26) for connecting with one of the optical transceivers (27-1 to 27-N) and establishing a communication path between one standby optical transceiver and a host network; a standby MAC control unit (25) for processing the frame as an alternative to a PON function unit, among PON function units (22-1 to 22-N) used at normal time, in which abnormality was detected; and a control unit (21) for monitoring the states of the PON function units (22-1 to 22-N) and outputting control information and identification information that pertain to the PON function unit in which abnormality was detected, the standby MAC control unit (25) processing the frame on the basis of the control information, and the electric switch (26) selecting a standby optical transceiver to connect on the basis of the identification information.

Description

局舎側装置および通信方法Station side apparatus and communication method
　本発明は、ＰＯＮ（Passive　Optical　Network）システムで使用される局舎側装置および通信方法に関する。 The present invention relates to a station side apparatus and a communication method used in a PON (Passive Optical Network) system.
　ＰＯＮシステムは、局舎側装置（以下、ＯＬＴ（Optical　Line　Terminal）とする）と、ユーザ側装置（以下、ＯＮＵ（Optical　Network　Unit）とする）と、を備える。ＯＬＴは、複数のＰＯＮ機能部を持ち、１つのＰＯＮ機能部に複数のＯＮＵが接続される。既にフィールド設置されている現行ＰＯＮシステムであるＧＥ－ＰＯＮ（Gigabit　Ethernet（登録商標）－PON）システムの置換えとして、次世代ＰＯＮシステムである１０Ｇ－ＥＰＯＮ（10Gigabit－Ethernet　PON）システムの導入が進められている。 The PON system includes a station side device (hereinafter referred to as OLT (Optical Line Terminal)) and a user side device (hereinafter referred to as ONU (Optical Network Unit)). The OLT has a plurality of PON function units, and a plurality of ONUs are connected to one PON function unit. As a replacement for the GE-PON (Gigabit Ethernet (registered trademark) -PON) system, which is an existing PON system already installed in the field, the introduction of the 10G-EPON (10 Gigabit-Ethernet PON) system, which is a next-generation PON system, is being promoted ing.
　次世代ＰＯＮシステムは、現行ＰＯＮシステムの機能に加えて、通信障害発生時に系の切替を可能とする冗長機能を持つ。次世代ＰＯＮシステムでは、正常系をＮ台、予備系を１台とするＮ：１の冗長構成を採用する場合、一般的に、Ｎ：１構成の光スイッチを追加する手段が取られる。ここで、光スイッチを追加した場合、ＰＯＮシステム全体として、光スイッチで発生する光損失分、送信器の光出力と対向受信器の受光感度との差を示すパワーバジェットが小さくなる。各装置の光出力および受光感度の性能を向上させることで、パワーバジェットが小さくなる事態を解消できる。しかしながら、実使用環境を考慮すると、ＯＮＵはユーザ装置であるため、システム改定に伴う装置の置換えは困難である。すなわち、置換えできないＯＮＵが設置されている環境下で光スイッチを追加すると、光スイッチで発生する光損失分、ＰＯＮシステム全体でのパワーバジェットが小さくなり、伝送可能な距離が短くなってしまう。 The next-generation PON system has a redundant function that enables system switching when a communication failure occurs, in addition to the functions of the current PON system. In the next-generation PON system, when an N: 1 redundant configuration with N normal systems and one standby system is adopted, generally, means for adding an optical switch with an N: 1 configuration is taken. Here, when an optical switch is added, the power budget indicating the difference between the optical output of the transmitter and the light receiving sensitivity of the counter receiver is reduced as much as the optical loss generated in the optical switch as a whole PON system. By improving the performance of the light output and light receiving sensitivity of each device, the situation where the power budget is reduced can be solved. However, considering the actual use environment, since the ONU is a user device, it is difficult to replace the device due to the system revision. That is, if an optical switch is added in an environment where an ONU that cannot be replaced is installed, the power budget of the entire PON system is reduced by the amount of optical loss generated by the optical switch, and the transmittable distance is shortened.
　冗長機能を持つＯＬＴで光損失の発生を抑える方法として、特許文献１には、光送受信器の後段にフレーム選択分離部を設けて予備系ＰＯＮ機能部を確保することで、冗長構成を可能にしたうえで光損失の発生を抑える技術が開示されている。 As a method for suppressing the occurrence of optical loss in an OLT having a redundant function, Patent Document 1 provides a redundant configuration by providing a frame selection / separation unit at the subsequent stage of the optical transceiver to secure a standby PON function unit. In addition, a technique for suppressing the occurrence of optical loss is disclosed.
特開２０１６－１６５０５３号公報JP 2016-165053 A
　しかしながら、特許文献１に記載のＯＬＴは、最も故障しやすい光送受信器が冗長構成になっていないため、実運用を想定した冗長構成になっていない、という問題があった。また、特許文献１に記載のＯＬＴは、主な目的がシステムコストの低減であり、ＰＯＮ機能部の数量を最小限におさえるため、１つのフレーム選択分離部が全回線分をまとめて処理している。フレーム選択分離部は、セレクタを多段に組んでいて複雑で高性能な構成になっており、Ｎ：１の冗長構成に適していない、という問題があった。 However, the OLT described in Patent Document 1 has a problem that the optical transmitter / receiver that is most likely to fail is not in a redundant configuration and therefore is not in a redundant configuration that assumes actual operation. The main purpose of the OLT described in Patent Document 1 is to reduce the system cost, and to minimize the number of PON function units, one frame selection / separation unit processes all lines together. Yes. The frame selection / separation unit has a complicated and high-performance configuration including multiple stages of selectors, and is not suitable for an N: 1 redundant configuration.
　本発明は、上記に鑑みてなされたものであって、実運用に適した冗長機能を持ちつつ、光損失の発生を抑えることが可能な局舎側装置を得ることを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to obtain a station-side device capable of suppressing occurrence of optical loss while having a redundancy function suitable for actual operation.
　上述した課題を解決し、目的を達成するために、本発明の局舎側装置は、上り通信のフレームを光信号から電気信号に変換し、下り通信のフレームを電気信号から光信号に変換する複数の予備系光送受信器と、複数の予備系光送受信器のうちの１つと接続し、１つの予備系光送受信器と上位ネットワークとの通信経路を確立する電気スイッチと、を備える。また、局舎側装置は、正常時に使用される複数の正常系送受信部のうち異常が検出された正常系送受信部の代替として、上位ネットワークから取得したデータを用いて電気信号のフレームを生成して電気スイッチに出力し、電気スイッチから取得した電気信号のフレームからデータを抽出して上位ネットワークに出力するフレーム処理を行う予備系フレーム処理部と、正常系送受信部の状態を監視し、異常が検出された正常系送受信部の制御情報および識別情報を出力する制御部と、を備える。局舎側装置において、予備系フレーム処理部は、制御情報に基づいてフレーム処理を行い、電気スイッチは、識別情報に基づいて接続する予備系光送受信器を選択することを特徴とする。 In order to solve the above-described problems and achieve the object, the station apparatus according to the present invention converts an upstream communication frame from an optical signal to an electrical signal, and converts a downstream communication frame from an electrical signal to an optical signal. And a plurality of standby optical transceivers, and an electrical switch that is connected to one of the plurality of standby optical transceivers and establishes a communication path between the one standby optical transceiver and the upper network. In addition, the station side device generates a frame of an electric signal using data acquired from the host network as an alternative to the normal transmission / reception unit in which an abnormality is detected among a plurality of normal transmission / reception units used during normal operation. Monitor the status of the standby system frame processing unit that performs frame processing to output data to the electrical switch, extract the data from the electrical signal frame acquired from the electrical switch, and output it to the higher level network, and the normal system transceiver unit. A control unit that outputs control information and identification information of the detected normal system transceiver unit. In the station side apparatus, the standby frame processing unit performs frame processing based on the control information, and the electrical switch selects a standby optical transceiver to be connected based on the identification information.
　本発明にかかる局舎側装置は、実運用に適した冗長機能を持ちつつ、光損失の発生を抑えることができる、という効果を奏する。 The station side apparatus according to the present invention has an effect that the occurrence of optical loss can be suppressed while having a redundancy function suitable for actual operation.
実施の形態１にかかるＯＬＴの構成例を示すブロック図FIG. 2 is a block diagram showing a configuration example of an OLT according to the first embodiment. 実施の形態１にかかるＯＬＴのハードウェア構成の例を示す図1 is a diagram illustrating an example of a hardware configuration of an OLT according to a first embodiment; 実施の形態１にかかるＯＬＴの動作を示すフローチャートFlowchart showing operation of OLT according to the first exemplary embodiment. 実施の形態２にかかるＯＬＴの構成例を示すブロック図FIG. 3 is a block diagram showing a configuration example of an OLT according to the second embodiment. 実施の形態３にかかるＯＬＴの構成例を示すブロック図FIG. 6 is a block diagram showing a configuration example of an OLT according to the third embodiment.
　以下に、本発明の実施の形態にかかる局舎側装置および通信方法を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, a station side apparatus and a communication method according to an embodiment of the present invention will be described in detail based on the drawings. Note that the present invention is not limited to the embodiments.
実施の形態１．
　図１は、本発明の実施の形態１にかかるＯＬＴ２の構成例を示すブロック図である。ＯＬＴ２は、Ｌ２スイッチ１およびＯＮＵ３－１～３－Ｚと接続している。Ｚは２以上の整数である。ＯＬＴ２は、ＯＬＴ２およびＯＮＵ３－１～３－Ｚを含むＰＯＮシステム１０を管理する側の局舎に設置された局舎側装置である。ＰＯＮシステム１０は、下り通信では、上位ネットワークからの信号をＬ２スイッチ１およびＯＬＴ２を経由してＯＮＵ３－１～３－Ｚに送信し、上り通信では、ＯＮＵ３－１～３－Ｚからの信号をＯＬＴ２およびＬ２スイッチ１を経由して上位ネットワークに送信する。 Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration example of the OLT 2 according to the first embodiment of the present invention. The OLT 2 is connected to the L2 switch 1 and the ONUs 3-1 to 3-Z. Z is an integer of 2 or more. The OLT 2 is a station-side device installed in a station that manages the PON system 10 including the OLT 2 and the ONUs 3-1 to 3-Z. The PON system 10 transmits signals from the upper network to the ONUs 3-1 to 3-Z via the L2 switch 1 and the OLT 2 in downlink communication, and signals from the ONUs 3-1 to 3-Z in uplink communication. The data is transmitted to the upper network via the OLT 2 and the L2 switch 1.
　Ｌ２スイッチ１は、指定された通信ルートに応じて、上位ネットワークとＯＬＴ２との間で主信号データを転送する。下り通信の場合、Ｌ２スイッチ１は、上位ネットワークから受信した主信号データを、通信ルートが正常系を通るときはＰＯＮ機能部２２－１～２２－Ｎのいずれかを選択して転送し、通信ルートが予備系を通るときはセレクタ部２３を選択して転送する。Ｎは２以上の整数である。上り通信の場合、Ｌ２スイッチ１は、通信ルートが正常系を通るときはＰＯＮ機能部２２－１～２２－Ｎのいずれかから主信号データを受信し、通信ルートが予備系を通るときはセレクタ部２３から主信号データを受信し、受信した主信号データを上位ネットワークに転送する。なお、主信号データのことを単にデータと称する場合がる。 The L2 switch 1 transfers main signal data between the upper network and the OLT 2 according to the designated communication route. In the case of downlink communication, the L2 switch 1 selects and transfers the main signal data received from the upper network by selecting one of the PON function units 22-1 to 22-N when the communication route passes through the normal system. When the route passes through the backup system, the selector unit 23 is selected and transferred. N is an integer of 2 or more. In uplink communication, the L2 switch 1 receives main signal data from any of the PON function units 22-1 to 22-N when the communication route passes through the normal system, and selects the selector when the communication route passes through the standby system. The main signal data is received from the unit 23, and the received main signal data is transferred to the upper network. The main signal data may be simply referred to as data.
　ＯＮＵ３－１～３－Ｚは、パーソナルコンピュータなどの端末装置と接続することを想定したユーザ側装置である。ＯＮＵ３－１～３－Ｚは、自装置に割り当てられたＭＡＣ（Media　Access　Control）アドレスなどの固有番号を用いて、ＯＬＴ２との間で主信号データを含む光信号のフレームの送受信を行う。ＯＮＵ３－１～３－Ｚを区別しない場合、ＯＮＵ３と称することがある。 ONUs 3-1 to 3-Z are user side devices that are assumed to be connected to a terminal device such as a personal computer. The ONUs 3-1 to 3-Z transmit and receive an optical signal frame including main signal data to and from the OLT 2 using a unique number such as a MAC (Media Access Control) address assigned to the ONU 3-1. When the ONUs 3-1 to 3-Z are not distinguished, they may be referred to as ONU3.
　ＯＬＴ２の構成について説明する。ＯＬＴ２は、制御部２１と、ＰＯＮ機能部２２－１～２２－Ｎと、セレクタ部２３と、を備える。ＰＯＮ機能部２２－１～２２－Ｎは、各々、ＭＡＣ制御部２２１と、光送受信器２２２と、を備える。セレクタ部２３は、予備系ＰＯＮ機能部２４と、予備系ＰＯＮ管理部２８と、光カプラ２９－１～２９－Ｎと、を備える。予備系ＰＯＮ機能部２４は、予備系ＭＡＣ制御部２５と、電気スイッチ２６と、光送受信器２７－１～２７－Ｎと、を備える。予備系ＰＯＮ管理部２８は、ＭＡＣ管理部２８１と、スイッチ管理部２８２と、光送受信器管理部２８３と、を備える。ＰＯＮ機能部２２－１～２２－Ｎ、光送受信器２７－１～２７－Ｎ、および光カプラ２９－１～２９－Ｎを区別しない場合、各々、ＰＯＮ機能部２２、光送受信器２７、および光カプラ２９と称することがある。 The configuration of OLT 2 will be described. The OLT 2 includes a control unit 21, PON function units 22-1 to 22-N, and a selector unit 23. Each of the PON function units 22-1 to 22-N includes a MAC control unit 221 and an optical transceiver 222. The selector unit 23 includes a standby PON function unit 24, a standby PON management unit 28, and optical couplers 29-1 to 29-N. The backup PON function unit 24 includes a backup MAC control unit 25, an electrical switch 26, and optical transceivers 27-1 to 27-N. The standby PON management unit 28 includes a MAC management unit 281, a switch management unit 282, and an optical transceiver management unit 283. When the PON function units 22-1 to 22-N, the optical transceivers 27-1 to 27-N, and the optical couplers 29-1 to 29-N are not distinguished, the PON function unit 22, the optical transceiver 27, and Sometimes referred to as an optical coupler 29.
　制御部２１は、ＯＬＴ２全体の動作を制御し、ＯＬＴ２の状態を管理する。制御部２１は、ＰＯＮ機能部２２－１～２２－Ｎの異常の有無を確認し、ＰＯＮ機能部２２－１～２２－Ｎの状態を管理する。制御部２１は、ＰＯＮ機能部２２－１～２２－Ｎのいずれかで異常が発生したことを検出した場合、異常が検出されたＰＯＮ機能部２２についての認証情報、ＯＮＵ認証状態、およびＯＮＵ警報情報を含むＭＡＣ情報を、予備系ＰＯＮ管理部２８のＭＡＣ管理部２８１に通知する。また、制御部２１は、異常が検出されたＰＯＮ機能部２２を識別するための識別情報を、予備系ＰＯＮ管理部２８のスイッチ管理部２８２に通知する。なお、ＭＡＣ情報のことを単に制御情報と称する場合がある。 The control unit 21 controls the operation of the entire OLT 2 and manages the state of the OLT 2. The control unit 21 checks whether there is an abnormality in the PON function units 22-1 to 22-N, and manages the state of the PON function units 22-1 to 22-N. When the control unit 21 detects that an abnormality has occurred in any of the PON function units 22-1 to 22-N, the authentication information, the ONU authentication state, and the ONU alarm for the PON function unit 22 in which the abnormality has been detected. The MAC information including the information is notified to the MAC management unit 281 of the standby PON management unit 28. In addition, the control unit 21 notifies the switch management unit 282 of the standby PON management unit 28 of identification information for identifying the PON function unit 22 in which an abnormality has been detected. Note that the MAC information may be simply referred to as control information.
　ＰＯＮ機能部２２－１～２２－Ｎは、正常時に使用される正常系の送受信部である。ＯＬＴ２は、一例として、Ｎ個のＰＯＮ機能部２２を備えているものとする。 The PON function units 22-1 to 22-N are normal transmission / reception units used at normal times. As an example, the OLT 2 includes N PON function units 22.
　ＭＡＣ制御部２２１は、Ｌ２スイッチ１から取得した下りの主信号データに対して、予め設定された対向ＯＮＵ３のＭＡＣ情報に基づいて、送信したい対向ＯＮＵ３のＭＡＣ情報を付与してフレームを生成するフレーム処理部である。ＭＡＣ制御部２２１は、生成したフレームを光送受信器２２２に出力する。また、ＭＡＣ制御部２２１は、光送受信器２２２から取得した上りのフレームに対して、予め設定された対向ＯＮＵ３のＭＡＣ情報に基づいて、どの対向ＯＮＵ３からのフレームかを特定し、フレームからＭＡＣ情報および主信号データを抽出する。ＭＡＣ制御部２２１は、フレームから抽出した主信号データをＬ２スイッチ１に出力する。 The MAC control unit 221 generates a frame by adding the MAC information of the opposite ONU 3 to be transmitted to the downlink main signal data acquired from the L2 switch 1 based on the preset MAC information of the opposite ONU 3 It is a processing unit. The MAC control unit 221 outputs the generated frame to the optical transceiver 222. In addition, the MAC control unit 221 identifies the frame from which the opposite ONU 3 is based on the preset MAC information of the opposite ONU 3 with respect to the upstream frame acquired from the optical transceiver 222, and the MAC information from the frame And main signal data is extracted. The MAC control unit 221 outputs the main signal data extracted from the frame to the L2 switch 1.
　光送受信器２２２は、ＭＡＣ制御部２２１から取得したフレームを電気信号から光信号に変換し、変換後の光信号のフレームを、接続する光カプラ２９を介して対向ＯＮＵ３に送信する。また、光送受信器２２２は、光カプラ２９を介して対向ＯＮＵ３から受信した光信号のフレームを電気信号のフレームに変換し、接続するＭＡＣ制御部２２１に出力する。光送受信器２２２は、例えば、ＸＦＰ（10Gbit/s　Small　Form　Factor　Pluggable）、ＳＦＰ（Small　Form　Factor　Pluggable）、ＳＦＰ＋（Small　Form　Factor　Pluggable　Plus）などである。 The optical transceiver 222 converts the frame acquired from the MAC control unit 221 from an electrical signal to an optical signal, and transmits the converted optical signal frame to the opposite ONU 3 via the connected optical coupler 29. The optical transceiver 222 converts the optical signal frame received from the opposite ONU 3 via the optical coupler 29 into an electrical signal frame, and outputs the frame to the connected MAC control unit 221. The optical transceiver 222 is, for example, XFP (10 Gbit / s Small Form Factor Pluggable), SFP (Small Form Factor Pluggable), SFP + (Small Form Factor Pluggable Plus), and the like.
　セレクタ部２３では、正常系の下り信号すなわちＰＯＮ機能部２２で生成された光信号のフレームに対して、光カプラ２９が、分配して各ＯＮＵ３に送信する。セレクタ部２３では、正常系の上り信号すなわち各ＯＮＵ３から受信した時分割多重送信された光信号に対して、光カプラ２９が、集約してＰＯＮ機能部２２に分岐する。 In the selector unit 23, the optical coupler 29 distributes and transmits the normal system downstream signal, that is, the frame of the optical signal generated by the PON function unit 22, to each ONU 3. In the selector unit 23, the optical coupler 29 aggregates and branches to the PON function unit 22 with respect to the normal uplink signal, that is, the time-division multiplexed optical signal received from each ONU 3.
　また、セレクタ部２３では、予備系の下り信号すなわちＬ２スイッチ１から取得した電気信号に対して、予備系ＰＯＮ機能部２４が、ＰＯＮ機能部２２と同様、送信したい対向ＯＮＵ３のＭＡＣ情報を付与してフレームを生成し、フレームを電気信号から光信号に変換する。光カプラ２９は、予備系ＰＯＮ機能部２４から取得した光信号のフレームを分配し、各ＯＮＵ３に送信する。セレクタ部２３では、予備系の上り信号すなわち各ＯＮＵ３から受信した時分割多重送信された光信号に対して、光カプラ２９が、集約して予備系ＰＯＮ機能部２４に転送する。予備系ＰＯＮ機能部２４は、ＰＯＮ機能部２２と同様、光信号のフレームを電気信号のフレームに変換し、どの対向ＯＮＵ３からのフレームかを特定し、フレームからＭＡＣ情報および主信号データを抽出する。予備系ＰＯＮ機能部２４は、フレームから抽出した主信号データをＬ２スイッチ１に出力する。 Further, in the selector unit 23, the standby PON function unit 24 adds the MAC information of the opposite ONU 3 to be transmitted to the backup downstream signal, that is, the electrical signal acquired from the L2 switch 1, in the same manner as the PON function unit 22. To generate a frame and convert the frame from an electrical signal to an optical signal. The optical coupler 29 distributes the frame of the optical signal acquired from the standby PON function unit 24 and transmits it to each ONU 3. In the selector unit 23, the optical coupler 29 aggregates and forwards the backup uplink signal, that is, the optical signal received from each ONU 3, to the backup PON function unit 24. Similarly to the PON function unit 22, the standby PON function unit 24 converts an optical signal frame into an electric signal frame, identifies which frame the opposite ONU 3 is from, and extracts MAC information and main signal data from the frame. . The standby PON function unit 24 outputs the main signal data extracted from the frame to the L2 switch 1.
　予備系ＰＯＮ機能部２４は、制御部２１において異常状態のＰＯＮ機能部２２が検出された場合、予備系ＰＯＮ管理部２８の制御に基づいて、異常が検出されたＰＯＮ機能部２２の代替のＰＯＮ機能部として動作する予備系の送受信部である。 When the control unit 21 detects the abnormal PON function unit 22, the standby PON function unit 24 replaces the PON function unit 22 in which an abnormality is detected based on the control of the standby PON management unit 28. This is a standby transmission / reception unit that operates as a functional unit.
　予備系ＭＡＣ制御部２５は、予備系ＰＯＮ管理部２８のＭＡＣ管理部２８１から取得したＭＡＣ情報に基づいて、異常が検出されたＰＯＮ機能部２２のＭＡＣ制御部２２１が正常時に行う動作と同様の動作を行うフレーム処理部である。予備系ＭＡＣ制御部２５は、ＰＯＮ機能部２２のうち異常が検出されたＰＯＮ機能部２２の代替として、Ｌ２スイッチ１を介して上位ネットワークから取得した主信号データを用いて電気信号のフレームを生成して電気スイッチ２６に出力する。また、予備系ＭＡＣ制御部２５は、電気スイッチ２６から取得した電気信号のフレームから主信号データを抽出して、Ｌ２スイッチ１を介して上位ネットワークに出力するフレーム処理を行う。 The standby MAC control unit 25 is the same as the operation performed when the MAC control unit 221 of the PON function unit 22 in which an abnormality is detected is normal based on the MAC information acquired from the MAC management unit 281 of the standby PON management unit 28. It is a frame processing unit that performs an operation. The spare MAC control unit 25 generates an electric signal frame using main signal data acquired from the upper network via the L2 switch 1 as an alternative to the PON function unit 22 in which an abnormality is detected in the PON function unit 22. And output to the electrical switch 26. Further, the standby MAC control unit 25 extracts main signal data from the frame of the electrical signal acquired from the electrical switch 26 and performs frame processing to output to the upper network via the L2 switch 1.
　電気スイッチ２６は、光送受信器２７－１～２７－Ｎのうちの１つの光送受信器２７と接続し、１つの光送受信器２７と上位ネットワークとの通信経路を確立する。電気スイッチ２６は、予備系ＰＯＮ管理部２８のスイッチ管理部２８２から取得した識別情報に基づいて、接続する光送受信器２７を選択し、接続先の光送受信器２７を切り替える。電気スイッチ２６は、予備系ＭＡＣ制御部２５と光送受信器２７－１～２７－Ｎとの間で電気信号を転送する。また、電気スイッチ２６は、次世代ＰＯＮシステムの信号の送信に使用される１０Ｇ送信用スイッチ２６１、次世代ＰＯＮシステムの信号の受信に使用される１０Ｇ受信用スイッチ２６２、現行ＰＯＮシステムの信号の送信に使用される１Ｇ送信用スイッチ２６３、および現行ＰＯＮシステムの信号の受信に使用される１Ｇ受信用スイッチ２６４を備える。このように、電気スイッチ２６は、通信速度毎にフレームの送信用の複数のスイッチおよび受信用の複数のスイッチを備える。なお、ここでは、電気スイッチ２６が内部に４種類のスイッチを備えているが、一例であり、電気スイッチ２６が内部に備えるスイッチの種類は、これらに限定されるものではない。 The electrical switch 26 is connected to one of the optical transceivers 27-1 to 27-N and establishes a communication path between the one optical transceiver 27 and the upper network. The electrical switch 26 selects the optical transceiver 27 to be connected based on the identification information acquired from the switch management unit 282 of the standby PON management unit 28, and switches the connection-destination optical transceiver 27. The electrical switch 26 transfers an electrical signal between the standby MAC control unit 25 and the optical transceivers 27-1 to 27-N. In addition, the electrical switch 26 includes a 10G transmission switch 261 used for transmitting a signal of the next-generation PON system, a 10G reception switch 262 used for receiving a signal of the next-generation PON system, and a signal transmission of the current PON system. 1G transmission switch 263 and 1G reception switch 264 used for receiving signals of the current PON system. As described above, the electrical switch 26 includes a plurality of switches for transmitting a frame and a plurality of switches for receiving for each communication speed. Here, the electric switch 26 includes four types of switches inside, but is an example, and the types of switches included in the electric switch 26 are not limited thereto.
　光送受信器２７－１～２７－Ｎは、ＰＯＮ機能部２２が備える光送受信器２２２と同様の機能を有する予備系光送受信器である。光送受信器２７－１～２７－Ｎは、上り通信のフレームを光信号から電気信号に変換し、下り通信のフレームを電気信号から光信号に変換する。 The optical transceivers 27-1 to 27-N are standby optical transceivers having the same functions as the optical transceiver 222 included in the PON function unit 22. The optical transceivers 27-1 to 27-N convert an upstream communication frame from an optical signal to an electrical signal, and convert a downstream communication frame from an electrical signal to an optical signal.
　予備系ＰＯＮ管理部２８は、予備系ＰＯＮ機能部２４の動作を制御する。予備系ＰＯＮ管理部２８は、制御部２１から異常が検出されたＰＯＮ機能部２２についてのＭＡＣ情報および識別情報を取得した場合、異常が検出されたＰＯＮ機能部２２の代替として予備系ＰＯＮ機能部２４を動作させるように制御する。 The standby PON management unit 28 controls the operation of the standby PON function unit 24. When the standby PON management unit 28 acquires the MAC information and the identification information about the PON function unit 22 in which the abnormality is detected from the control unit 21, the standby PON function unit is used as an alternative to the PON function unit 22 in which the abnormality is detected. 24 is controlled to operate.
　ＭＡＣ管理部２８１は、予備系ＭＡＣ制御部２５の動作を管理する。ＭＡＣ管理部２８１は、制御部２１から取得した、異常が検出されたＰＯＮ機能部２２のＭＡＣ情報を予備系ＭＡＣ制御部２５に通知する。 The MAC management unit 281 manages the operation of the standby MAC control unit 25. The MAC management unit 281 notifies the standby MAC control unit 25 of the MAC information of the PON function unit 22 obtained from the control unit 21 in which an abnormality is detected.
　スイッチ管理部２８２は、電気スイッチ２６の動作、すなわち接続先の切り替えを管理する。スイッチ管理部２８２は、制御部２１から取得した、異常が検出されたＰＯＮ機能部２２の識別情報を電気スイッチ２６に通知する。 The switch management unit 282 manages the operation of the electrical switch 26, that is, switching of the connection destination. The switch management unit 282 notifies the electrical switch 26 of the identification information of the PON function unit 22 in which the abnormality is detected, acquired from the control unit 21.
　光送受信器管理部２８３は、光送受信器２７－１～２７－Ｎの各々から、光信号のフレームを送信した時の送信パワーすなわち送信信号強度の情報、および光信号のフレームを受信した時の受信パワーすなわち受信信号強度の情報を取得する。光送受信器管理部２８３は、各光送受信器２７から取得した送受信パワーの情報に基づいて、光送受信器２７の状態を監視し、異常の有無を検出する。光送受信器管理部２８３は、光送受信器２７のいずれかで異常が発生していると判断した場合、制御部２１に光送受信器２７の異常を通知する。光送受信器管理部２８３は、送信パワーの確認方法について、光送受信器２７の内部のレーザダイオードの背面光をモニタする方法など一般的な技術を使用する。 The optical transceiver management unit 283 receives the transmission power when transmitting the optical signal frame, that is, the information on the transmission signal intensity, and the optical signal frame from each of the optical transceivers 27-1 to 27-N. Information on received power, that is, received signal strength is acquired. The optical transceiver management unit 283 monitors the state of the optical transceiver 27 based on the transmission / reception power information acquired from each optical transceiver 27 and detects the presence / absence of an abnormality. If the optical transceiver management unit 283 determines that an abnormality has occurred in any of the optical transceivers 27, the optical transceiver management unit 283 notifies the controller 21 of the abnormality of the optical transceiver 27. The optical transmitter / receiver management unit 283 uses a general technique such as a method of monitoring the back light of the laser diode inside the optical transmitter / receiver 27 as a method for checking the transmission power.
　光カプラ２９－１～２９－Ｎは、各々が、他の光カプラ２９とは異なる１つのＰＯＮ機能部２２と接続し、また、他の光カプラ２９とは異なる１つの光送受信器２７と接続している。光カプラ２９－１～２９－Ｎは、各々が、ＯＮＵ３から受信した光信号を集約し、光信号を接続するＰＯＮ機能部２２および光送受信器２７に分岐する。また、光カプラ２９－１～２９－Ｎは、各々が、接続するＰＯＮ機能部２２または光送受信器２７から取得した光信号を分配し、各ＯＮＵ３に送信する。 Each of the optical couplers 29-1 to 29 -N is connected to one PON function unit 22 that is different from the other optical couplers 29, and is connected to one optical transceiver 27 that is different from the other optical couplers 29. is doing. Each of the optical couplers 29-1 to 29 -N aggregates the optical signals received from the ONU 3 and branches to the PON function unit 22 and the optical transceiver 27 that connect the optical signals. Each of the optical couplers 29-1 to 29-N distributes the optical signal acquired from the PON function unit 22 or the optical transmitter / receiver 27 to be connected, and transmits the optical signal to each ONU 3.
　図２は、実施の形態１にかかるＯＬＴ２のハードウェア構成の例を示す図である。ＯＬＴ２では、冗長機能を実現するにあたって、図２に示すハードウェア構成のうち、予備系ＰＯＮ管理部２８、予備系ＭＡＣ制御部２５、および電気スイッチ２６の各ハードウェアが新たに必要となり、他の制御部２１、およびＰＯＮ機能部２２の各ハードウェアはこれまでのシステムからの流用を想定している。ここで、ＯＳＳ（Operation　Support　System）９は、例えば、パーソナルコンピュータなどの媒体を通じて、システム管理者が各装置に所望の設定を行う。また、ＯＳＳ９は、ＰＯＮシステム１０の運用状態を管理、具体的には、各装置の異常状態を把握する。なお、図２では、電気スイッチ２６のハードウェアが光送受信器２７のハードウェアを含む構成にしているが、一例であり、電気スイッチ２６および光送受信器２７を別々のハードウェアで構成してもよい。 FIG. 2 is a diagram illustrating an example of a hardware configuration of the OLT 2 according to the first embodiment. In the OLT 2, in order to realize the redundant function, the spare PON management unit 28, the spare MAC control unit 25, and the electrical switch 26 are newly required among the hardware configurations shown in FIG. Each hardware of the control unit 21 and the PON function unit 22 is assumed to be diverted from the conventional system. Here, in the OSS (Operation Support System) 9, for example, a system administrator performs a desired setting for each device through a medium such as a personal computer. The OSS 9 manages the operation state of the PON system 10, specifically, grasps the abnormal state of each device. In FIG. 2, the hardware of the electrical switch 26 is configured to include the hardware of the optical transmitter / receiver 27. However, this is only an example, and the electrical switch 26 and the optical transmitter / receiver 27 may be configured of separate hardware. Good.
　制御部２１は、図２に示すように、通信ＩＦ（InterFace）１０１、プロセッサ１０２、ＲＡＭ（Random　Access　Memory）１０３、ＲＯＭ（Read　Only　Memory）１０４、および通信ＩＦ１０５から構成される処理回路により実現される。制御部２１は、ソフトウェア、ファームウェア、またはソフトウェアとファームウェアの組み合わせにより実現される。ソフトウェアおよびファームウェアはプログラムとして記述され、ＲＯＭ１０４に保存される。外部用の通信ＩＦ１０１は、ＯＳＳ９からの指示信号を受信すると、プロセッサ１０２に指示信号を転送する。プロセッサ１０２は、予めＲＯＭ１０４に保存されたプログラム情報に基づいて、ＲＡＭ１０３のワーク領域を使用し、内部用の通信ＩＦ１０５を介して各部に制御信号を送信する。また、プロセッサ１０２は、通信ＩＦ１０５を介して各部からの応答信号を受信し、予めＲＯＭ１０４に保存されたプログラム情報に基づいて、ＲＡＭ１０３のワーク領域を使用して処理する。 As shown in FIG. 2, the control unit 21 is realized by a processing circuit including a communication IF (InterFace) 101, a processor 102, a RAM (Random Access Memory) 103, a ROM (Read Only Memory) 104, and a communication IF 105. The The control unit 21 is realized by software, firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in the ROM 104. When receiving the instruction signal from the OSS 9, the external communication IF 101 transfers the instruction signal to the processor 102. Based on the program information stored in the ROM 104 in advance, the processor 102 uses the work area of the RAM 103 and transmits a control signal to each unit via the internal communication IF 105. The processor 102 also receives response signals from the respective units via the communication IF 105 and processes them using the work area of the RAM 103 based on program information stored in the ROM 104 in advance.
　ここで、プロセッサ１０２は、例えば、ＣＰＵ（Central　Processing　Unit）、中央処理装置、処理装置、演算装置、マイクロプロセッサ、マイクロコンピュータ、ＤＳＰ（Digital　Signal　Processor）である。また、ＲＯＭ１０４は、例えば、ＥＰＲＯＭ（Erasable　Programmable　Read　Only　Memory）、ＥＥＰＲＯＭ（登録商標）（Electrically　Erasable　Programmable　Read　Only　Memory）などの、不揮発性または揮発性の半導体メモリ、磁気ディスク、フレキシブルディスク、光ディスク、コンパクトディスク、ミニディスク、ＤＶＤ（Digital　Versatile　Disk）である。また、ＲＡＭ１０３は、例えば、不揮発性または揮発性の半導体メモリ、磁気ディスク、フレキシブルディスク、光ディスク、コンパクトディスク、ミニディスク、ＤＶＤである。なお、制御部２１を実現する処理回路については、専用のハードウェアで実現してもよい。専用のハードウェアで実現する場合、処理回路は、例えば、単一回路、複合回路、プログラム化したプロセッサ、並列プログラム化したプロセッサ、ＡＳＩＣ（Application　Specific　Integrated　Circuit）、ＦＰＧＡ（Field　Programmable　Gate　Array）、またはこれらを組み合わせたものである。 Here, the processor 102 is, for example, a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, and a DSP (Digital Signal Processor). The ROM 104 is, for example, a nonvolatile or volatile semiconductor memory such as EPROM (Erasable Programmable Read Only Memory) or EEPROM (registered trademark) (Electrically Erasable Programmable Read Only Memory), a magnetic disk, a flexible disk, an optical disk, or a compact. Discs, minidiscs, and DVDs (Digital Versatile Disks). The RAM 103 is, for example, a nonvolatile or volatile semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD. Note that the processing circuit for realizing the control unit 21 may be realized by dedicated hardware. When implemented with dedicated hardware, the processing circuit can be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or It is a combination of these.
　ＰＯＮ機能部２２は、図２に示すように、通信ＩＦ２０１、プロセッサ２０２、ＲＡＭ２０３、ＲＯＭ２０４、および光電変換回路２０５から構成される処理回路により実現される。なお、図２では記載を簡潔にするため、光電変換回路を「Ｏ／Ｅ（Optical／Electrical　converter）」と記載している。後述する光電変換回路５０３の部分も同様とする。このうち、通信ＩＦ２０１、プロセッサ２０２、ＲＡＭ２０３、およびＲＯＭ２０４によってＭＡＣ制御部２２１が実現される。光送受信器２２２は光電変換回路２０５である。通信ＩＦ部２０１は、制御部２１からの受信した制御信号をプロセッサ２０２に転送する。プロセッサ２０２は、制御部２１と同様、予めＲＯＭ２０４に保存されたプログラム情報に基づいて、ＲＡＭ２０３のワーク領域を使用し、フレームを生成、終端、および透過するフレーム処理回路の処理を行う。プロセッサ２０２は、フレーム処理した結果を、通信ＩＦ２０１を介して制御部２１に通知する。ＯＬＴ２は、実際にはＮ個のＰＯＮ機能部２２を備えているが、図２はハードウェア構成の例を説明する図のため１つのみ記載している。プロセッサ２０２、ＲＡＭ２０３、およびＲＯＭ２０４の具体例は、前述の通りである。 The PON function unit 22 is realized by a processing circuit including a communication IF 201, a processor 202, a RAM 203, a ROM 204, and a photoelectric conversion circuit 205 as shown in FIG. In FIG. 2, the photoelectric conversion circuit is described as “O / E (Optical / Electrical converter)” for the sake of brevity. The same applies to the photoelectric conversion circuit 503 described later. Among these, the MAC control unit 221 is realized by the communication IF 201, the processor 202, the RAM 203, and the ROM 204. The optical transceiver 222 is a photoelectric conversion circuit 205. The communication IF unit 201 transfers the control signal received from the control unit 21 to the processor 202. Similar to the control unit 21, the processor 202 uses the work area of the RAM 203 based on program information stored in advance in the ROM 204, and performs processing of a frame processing circuit that generates, terminates, and transmits a frame. The processor 202 notifies the control unit 21 of the frame processing result via the communication IF 201. Although the OLT 2 actually includes N PON function units 22, FIG. 2 shows only one for the purpose of explaining an example of the hardware configuration. Specific examples of the processor 202, the RAM 203, and the ROM 204 are as described above.
　予備系ＰＯＮ管理部２８は、図２に示すように、通信ＩＦ３０１、プロセッサ３０２、ＲＡＭ３０３、およびＲＯＭ３０４から構成される処理回路により実現される。通信ＩＦ３０１は、制御部２１から受信した制御信号をプロセッサ３０２に転送する。プロセッサ３０２は、制御部２１などと同様、予めＲＯＭ３０４に保存されたプログラム情報に基づいて、ＲＡＭ３０３のワーク領域を使用し、予備系ＭＡＣ制御部２５に対してＭＡＣ情報を送信し、電気スイッチ２６に識別情報を送信する。プロセッサ３０２、ＲＡＭ３０３、およびＲＯＭ３０４の具体例は、前述の通りである。 As shown in FIG. 2, the standby PON management unit 28 is realized by a processing circuit including a communication IF 301, a processor 302, a RAM 303, and a ROM 304. The communication IF 301 transfers the control signal received from the control unit 21 to the processor 302. Similar to the control unit 21 and the like, the processor 302 uses the work area of the RAM 303 based on the program information stored in advance in the ROM 304, transmits the MAC information to the standby MAC control unit 25, and sends it to the electrical switch 26. Send identification information. Specific examples of the processor 302, the RAM 303, and the ROM 304 are as described above.
　予備系ＭＡＣ制御部２５は、図２に示すように、通信ＩＦ４０１、プロセッサ４０２、ＲＡＭ４０３、およびＲＯＭ４０４から構成される処理回路により実現される。通信ＩＦ４０１は、予備系ＰＯＮ管理部２８から受信したＭＡＣ情報をプロセッサ４０２に転送する。プロセッサ４０２は、制御部２１などと同様、予めＲＯＭ４０４に保存されたプログラム情報に基づいて、ＲＡＭ４０３のワーク領域を使用し、フレームを生成、終端、および透過するフレーム処理回路の処理を行う。プロセッサ４０２は、フレーム処理した結果を、通信ＩＦ４０１を介して制御部２１に通知する。プロセッサ４０２、ＲＡＭ４０３、およびＲＯＭ４０４の具体例は、前述の通りである。 As shown in FIG. 2, the standby MAC control unit 25 is realized by a processing circuit including a communication IF 401, a processor 402, a RAM 403, and a ROM 404. The communication IF 401 transfers the MAC information received from the standby PON management unit 28 to the processor 402. Similar to the control unit 21 and the like, the processor 402 uses the work area of the RAM 403 based on program information stored in advance in the ROM 404, and performs processing of a frame processing circuit that generates, terminates, and transmits a frame. The processor 402 notifies the control unit 21 of the frame processing result via the communication IF 401. Specific examples of the processor 402, the RAM 403, and the ROM 404 are as described above.
　電気スイッチ部２６は、図２に示すように、通信ＩＦ５０１、セレクタ回路５０２、および光電変換回路５０３から構成される処理回路により実現される。１０Ｇ送信用スイッチ２６１、１０Ｇ受信用スイッチ２６２、１Ｇ送信用スイッチ２６３、および１Ｇ受信用スイッチ２６４は、セレクタ回路５０２である。光送受信器２７は、光電変換回路５０３である。通信ＩＦ５０１は、予備系ＰＯＮ管理部２８から通知された識別情報をセレクタ回路５０２に転送する。セレクタ回路５０２は、識別情報に基づいて各スイッチについてスイッチ番号、すなわち接続する光電変換回路５０３を選択する。光電変換回路５０３は、送信パワーおよび受信パワーの情報を、通信ＩＦ５０１を介して、予備系ＰＯＮ管理部２８に送信する。ＯＬＴ２は、実際には電気スイッチ２６および光送受信器２７のために複数のセレクタ回路５０２および光電変換回路５０３を備えているが、図２はハードウェア構成の例を説明する図のため各々１つのみ記載している。 The electrical switch unit 26 is realized by a processing circuit including a communication IF 501, a selector circuit 502, and a photoelectric conversion circuit 503, as shown in FIG. The 10G transmission switch 261, the 10G reception switch 262, the 1G transmission switch 263, and the 1G reception switch 264 are the selector circuit 502. The optical transceiver 27 is a photoelectric conversion circuit 503. The communication IF 501 transfers the identification information notified from the standby PON management unit 28 to the selector circuit 502. The selector circuit 502 selects a switch number for each switch, that is, the photoelectric conversion circuit 503 to be connected based on the identification information. The photoelectric conversion circuit 503 transmits information on transmission power and reception power to the standby PON management unit 28 via the communication IF 501. The OLT 2 actually includes a plurality of selector circuits 502 and a photoelectric conversion circuit 503 for the electrical switch 26 and the optical transceiver 27, but FIG. 2 is a diagram for explaining an example of the hardware configuration. Only listed.
　つぎに、システム管理者がＯＳＳ９からＯＬＴ２に各種設定を行い、ＯＬＴ２が異常を検出したときに冗長機能による予備系への切り替えを行うまでの一連の動作について説明する。図３は、実施の形態１にかかるＯＬＴ２の動作を示すフローチャートである。 Next, a series of operations from when the system administrator makes various settings to the OLT 2 from the OSS 9 until the OLT 2 detects an abnormality and switches to the standby system by the redundant function will be described. FIG. 3 is a flowchart of the operation of the OLT 2 according to the first embodiment.
　まず、具体的なＯＬＴ２の動作の前に、ＯＳＳ９から、ユーザの操作などによって、設定情報を含む制御信号を制御部２１に送信する。制御部２１は、ＯＳＳ９からの設定情報を反映するとともに、ＰＯＮ機能部２２にも設定情報を反映させる。また、制御部２１は、予備系ＰＯＮ管理部２８にも設定情報を通知するが、予備系ＰＯＮ管理部２８での設定情報の処理方法については、特に限定されない。例えば、予備系ＰＯＮ管理部２８は、自身で設定情報を終端した場合、予備系ＭＡＣ制御部２５および電気スイッチ２６には設定情報を通知しない。予備ＭＡＣ制御部２５は、受信したフレームを全て終端し、後段に転送しない。予備系ＰＯＮ管理部２８が設定情報を予備系ＭＡＣ制御部２５および電気スイッチ２６に転送した場合も同様、予備ＭＡＣ制御部２５は、ＰＯＮ機能部２２の異常状態を示す信号が転送されてきているわけではないので、受信したフレームを全て終端し、後段に転送しない。なお、正常系のＰＯＮ機能部２２では、設定情報が反映された後、上り信号および下り信号ともにフレームの転送を行う。 First, before a specific operation of the OLT 2, a control signal including setting information is transmitted from the OSS 9 to the control unit 21 by a user operation or the like. The control unit 21 reflects the setting information from the OSS 9 and also reflects the setting information in the PON function unit 22. The control unit 21 also notifies the standby PON management unit 28 of the setting information, but the setting information processing method in the standby PON management unit 28 is not particularly limited. For example, when the setting information is terminated by itself, the backup PON management unit 28 does not notify the backup MAC control unit 25 and the electrical switch 26 of the setting information. The spare MAC control unit 25 terminates all received frames and does not transfer them to the subsequent stage. Similarly, when the standby PON management unit 28 transfers the setting information to the standby MAC control unit 25 and the electrical switch 26, the backup MAC control unit 25 receives a signal indicating an abnormal state of the PON function unit 22. Since it is not the case, all received frames are terminated and not transferred to the subsequent stage. The normal PON function unit 22 transfers the frame for both the upstream signal and the downstream signal after the setting information is reflected.
　ＯＬＴ２の動作について、具体的に、制御部２１は、ＰＯＮ機能部２２の状態を監視しる（ステップＳ１）。制御部２１は、ＰＯＮ機能部２２から故障検知が通知されない場合はＰＯＮ機能部２２で異常が発生していないと判断し（ステップＳ２：Ｎｏ）、ＰＯＮ機能部２２の状態の監視を継続する。例えば、ＰＯＮ機能部２２の光送受信器２２２で故障が発生した場合、ＰＯＮ機能部２２は、上りフレームを受信することができなくなるので、制御部２１に故障検知を通知する。制御部２１は、ＰＯＮ機能部２２から故障検知が通知された場合はＰＯＮ機能部２２で異常が発生したと判断し（ステップＳ２：Ｙｅｓ）、異常が検出されたＰＯＮ機能部２２のＭＡＣ情報および識別情報を予備系ＰＯＮ管理部２８に通知する（ステップＳ３）。なお、制御部２１は、必要に応じてＯＳＳ９にＰＯＮ機能部２２の故障検知を通知する。 Regarding the operation of the OLT 2, specifically, the control unit 21 monitors the state of the PON function unit 22 (step S1). When the failure detection is not notified from the PON function unit 22, the control unit 21 determines that no abnormality has occurred in the PON function unit 22 (step S2: No), and continues to monitor the state of the PON function unit 22. For example, when a failure occurs in the optical transceiver 222 of the PON function unit 22, the PON function unit 22 cannot receive an upstream frame, and thus notifies the control unit 21 of the failure detection. When the failure detection is notified from the PON function unit 22, the control unit 21 determines that an abnormality has occurred in the PON function unit 22 (step S2: Yes), and the MAC information of the PON function unit 22 in which the abnormality is detected and The identification information is notified to the standby PON management unit 28 (step S3). The control unit 21 notifies the OSS 9 of failure detection of the PON function unit 22 as necessary.
　予備系ＰＯＮ管理部２８のＭＡＣ管理部２８１は、異常が検出されたＰＯＮ機能部２２のＭＡＣ情報を予備系ＭＡＣ制御部２５に通知する（ステップＳ４）。また、予備系ＰＯＮ管理部２８のスイッチ管理部２８２は、異常が検出されたＰＯＮ機能部２２の識別情報を電気スイッチ２６に通知する（ステップＳ５）。 The MAC management unit 281 of the standby PON management unit 28 notifies the standby MAC control unit 25 of the MAC information of the PON function unit 22 in which an abnormality has been detected (step S4). In addition, the switch management unit 282 of the standby PON management unit 28 notifies the electrical switch 26 of the identification information of the PON function unit 22 in which an abnormality has been detected (step S5).
　予備系ＭＡＣ制御部２５は、ＭＡＣ情報に基づいてフレーム処理を行う（ステップＳ６）。具体的に、予備系ＭＡＣ制御部２５は、ＭＡＣ情報をフレーム処理回路に反映し、フレーム処理を行う。フレーム処理の内容は前述の通りである。 The standby MAC control unit 25 performs frame processing based on the MAC information (step S6). Specifically, the backup MAC control unit 25 reflects the MAC information in the frame processing circuit and performs frame processing. The contents of the frame processing are as described above.
　電気スイッチ２６は、識別情報に基づいて接続する光送受信器２７を選択する（ステップＳ７）。具体的に、電気スイッチ２６は、セレクタ回路５０２、すなわち１０Ｇ送信用スイッチ２６１、１０Ｇ受信用スイッチ２６２、１Ｇ送信用スイッチ２６３、および１Ｇ受信用スイッチ２６４を所望のスイッチ位置に切り替える。 The electrical switch 26 selects the optical transceiver 27 to be connected based on the identification information (step S7). Specifically, the electrical switch 26 switches the selector circuit 502, that is, the 10G transmission switch 261, the 10G reception switch 262, the 1G transmission switch 263, and the 1G reception switch 264 to desired switch positions.
　これにより、予備系ＰＯＮ機能部２４では、ハードウェアとして予備系の通信ルートが確立する。その後、予備系ＭＡＣ制御部２５は、フレーム処理した結果を制御部２１に通知する。制御部２１は、予備系ＭＡＣ制御部２５からのフレーム処理結果に基づいて、予備系ＰＯＮ機能部２４が正常に動作しているか否かを判定する。ＯＬＴ２では、図３のフローチャートの処理において、ステップＳ４，Ｓ６の処理、およびステップＳ５，Ｓ７の処理を並行して行ってもよい。 As a result, the standby PON function unit 24 establishes a standby communication route as hardware. Thereafter, the standby MAC control unit 25 notifies the control unit 21 of the result of the frame processing. The control unit 21 determines whether or not the standby PON function unit 24 is operating normally based on the frame processing result from the standby MAC control unit 25. In the OLT 2, in the process of the flowchart of FIG. 3, the processes in steps S4 and S6 and the processes in steps S5 and S7 may be performed in parallel.
　なお、正常系のＰＯＮ機能部２２でハードウェア故障が発生した場合を想定した系切替方法について説明したが、ＯＬＴ２が系切替処理を行うタイミングは前述の例に限定されるものではない。ＯＬＴ２は、例えば、ＯＳＳ９からの外部コマンドによって系切替を行ってもよいし、ハードウェア故障以外の異常、例えば、所望のフレームが転送されない場合に系切替を行ってもよい。ＯＬＴ２において、系切替要因は他にも存在し、各要因に対して前述の系切替処理は適用可能である。そのため、ＯＬＴ２での系切替処理の適用範囲は、ハードウェア故障に限定されない。 In addition, although the system switching method assuming the case where a hardware failure has occurred in the normal system PON function unit 22 has been described, the timing at which the OLT 2 performs the system switching process is not limited to the above example. For example, the OLT 2 may perform system switching by an external command from the OSS 9 or may perform system switching when an abnormality other than a hardware failure, for example, a desired frame is not transferred. In OLT 2, there are other system switching factors, and the above-described system switching processing can be applied to each factor. Therefore, the application range of the system switching process in the OLT 2 is not limited to hardware failure.
　以上説明したように、本実施の形態によれば、ＯＬＴ２は、光スイッチを使用せずに電気スイッチ２６を使用し、電気スイッチ２６と光カプラ２９との間に複数の光送受信器２７を設けることで、光損失の発生を抑えることができる。これにより、ＯＬＴ２は既にフィールド設置されているＯＮＵ３を流用したうえで、ＰＯＮシステム１０のパワーバジェットを維持させることができる。 As described above, according to the present embodiment, the OLT 2 uses the electrical switch 26 without using the optical switch, and provides a plurality of optical transceivers 27 between the electrical switch 26 and the optical coupler 29. Thus, the occurrence of optical loss can be suppressed. Thereby, the OLT 2 can maintain the power budget of the PON system 10 after diverting the ONU 3 already installed in the field.
　また、ＯＬＴ２は、最も故障しやすい機能部である光送受信器２７が冗長構成となっている。これにより、ＯＬＴ２は、実運用を想定した冗長構成、かつ、Ｎ：１の冗長構成を実現するにあたってシンプルな構成となっている。また、ＯＬＴ２は、既にフィールド設置されているＰＯＮシステムが、加入者ごとに上り信号の波長帯を割り当てるシステム、または使用する波長帯が同じで時分割送信するシステムであるかに係わらず、一般的なＰＯＮシステムに適用可能な構成となっている。 Also, the OLT 2 has a redundant configuration of the optical transceiver 27, which is the functional unit that is most likely to fail. Thus, the OLT 2 has a simple configuration for realizing a redundant configuration assuming actual operation and an N: 1 redundant configuration. The OLT 2 is generally used regardless of whether the PON system already installed in the field is a system that assigns an upstream signal wavelength band to each subscriber or a system that uses the same wavelength band and performs time division transmission. This configuration can be applied to various PON systems.
実施の形態２．
　実施の形態２では、セレクタ部の光送受信器の消費電力を低減する処理について説明する。 Embodiment 2. FIG.
In the second embodiment, processing for reducing the power consumption of the optical transceiver of the selector unit will be described.
　図４は、実施の形態２にかかるＯＬＴ２ａの構成例を示すブロック図である。ＰＯＮシステム１０ａは、ＯＬＴ２ａおよびＯＮＵ３－１～３－Ｚを含む。ＯＬＴ２ａは、実施の形態１のＯＬＴ２に対して、セレクタ部２３をセレクタ部２３ａに置き換えたものである。セレクタ部２３ａは、予備系ＰＯＮ機能部２４ａと、予備系ＰＯＮ管理部２８ａと、光カプラ２９－１～２９－Ｎと、を備える。予備系ＰＯＮ機能部２４ａは、予備系ＭＡＣ制御部２５と、電気スイッチ２６と、光送受信器２７ａ－１～２７ａ－Ｎと、を備える。予備系ＰＯＮ管理部２８ａは、ＭＡＣ管理部２８１と、スイッチ管理部２８２ａと、光送受信器管理部２８３ａと、を備える。光送受信器２７ａ－１～２７ａ－Ｎを区別しない場合、光送受信器２７ａと称することがある。 FIG. 4 is a block diagram of a configuration example of the OLT 2a according to the second embodiment. The PON system 10a includes an OLT 2a and ONUs 3-1 to 3-Z. The OLT 2a is obtained by replacing the selector unit 23 with the selector unit 23a with respect to the OLT 2 of the first embodiment. The selector unit 23a includes a standby PON function unit 24a, a standby PON management unit 28a, and optical couplers 29-1 to 29-N. The backup PON function unit 24a includes a backup MAC control unit 25, an electrical switch 26, and optical transceivers 27a-1 to 27a-N. The standby PON management unit 28a includes a MAC management unit 281, a switch management unit 282a, and an optical transceiver management unit 283a. When the optical transceivers 27a-1 to 27a-N are not distinguished, they may be referred to as optical transceivers 27a.
　スイッチ管理部２８２ａは、実施の形態１のスイッチ管理部２８２の機能に加えて、異常が検出されたＰＯＮ機能部２２の識別情報を光送受信器管理部２８３ａに通知する。 The switch management unit 282a notifies the optical transceiver management unit 283a of the identification information of the PON function unit 22 in which an abnormality is detected, in addition to the function of the switch management unit 282 of the first embodiment.
　光送受信器管理部２８３ａは、光送受信器管理部２８３の機能に加えて、識別情報に基づいて、予備系の経路として電気スイッチ２６で選択されていない光送受信器２７ａ、すなわち異常が検出されたＰＯＮ機能部２２の代替として動作していない光送受信器２７ａに対して待機指示を通知し、待機モードにする。 In addition to the function of the optical transmitter / receiver manager 283, the optical transmitter / receiver manager 283a detects an optical transmitter / receiver 27a that has not been selected by the electrical switch 26 as a standby path based on the identification information, that is, an abnormality is detected. A standby instruction is notified to the optical transceiver 27a that is not operating as an alternative to the PON function unit 22, and the standby mode is set.
　光送受信器２７ａは、光送受信器２７の機能に加えて、光送受信器管理部２８３ａから待機指示が通知された場合、通常の動作モードと比較して低消費電力の待機モードに移行する。 In addition to the function of the optical transmitter / receiver 27, the optical transmitter / receiver 27a shifts to a standby mode with lower power consumption than the normal operation mode when a standby instruction is notified from the optical transmitter / receiver manager 283a.
　ＯＬＴ２ａにおいて、その他の構成の動作は実施の形態１と同様である。ＯＬＴ２ａでは、光送受信器２７ａ－１～２７ａ－Ｎのうち、電気スイッチ２６と接続している１つの光送受信器２７ａ以外の光送受信器２７ａを待機モードにする。なお、ＯＬＴ２ａは、正常時、すなわち、ＰＯＮ機能部２２が全て正常に動作している場合、全ての光送受信器２７ａを待機モードにしていてもよい。 In the OLT 2a, the operation of other configurations is the same as that of the first embodiment. In the OLT 2a, among the optical transceivers 27a-1 to 27a-N, the optical transceivers 27a other than the one optical transceiver 27a connected to the electrical switch 26 are set in the standby mode. Note that, when the OLT 2a is normal, that is, when all the PON function units 22 are operating normally, all the optical transceivers 27a may be in the standby mode.
　以上説明したように、本実施の形態によれば、ＯＬＴ２ａは、スイッチ管理部２８２ａから光送受信器管理部２８３ａへ識別情報を通知し、光送受信器管理部２８３ａが、光送受信器２７ａを制御して、電気スイッチ２６と接続していない光送受信器２７ａを待機モードにさせることとした。これにより、ＯＬＴ２ａは、実施の形態１と同様の効果を得るとともに、実施の形態１と比較して、光送受信器２７ａすなわちセレクタ部２３ａの消費電力を低減することができる。また、ＯＬＴ２ａは、最も故障しやすい光送受信器２７ａの使用頻度が下がることによって、実施の形態１と比較して、光送受信器２７ａすなわちセレクタ部２３ａの製品寿命を延ばすことができる。 As described above, according to the present embodiment, the OLT 2a notifies the optical transceiver management unit 283a of identification information from the switch management unit 282a, and the optical transceiver management unit 283a controls the optical transceiver 27a. Thus, the optical transceiver 27a not connected to the electrical switch 26 is set to the standby mode. Thereby, the OLT 2a can obtain the same effect as that of the first embodiment, and can reduce the power consumption of the optical transceiver 27a, that is, the selector unit 23a, as compared with the first embodiment. Further, the OLT 2a can extend the product life of the optical transceiver 27a, that is, the selector unit 23a, as compared with the first embodiment, by reducing the frequency of use of the optical transceiver 27a that is most likely to fail.
実施の形態３．
　実施の形態３では、予備系ＰＯＮ管理部が予備系ＰＯＮ機能部に自己診断を実施させる処理について説明する。 Embodiment 3 FIG.
In the third embodiment, a process in which the standby PON management unit causes the standby PON function unit to perform self-diagnosis will be described.
　図５は、実施の形態３にかかるＯＬＴ２ｂの構成例を示すブロック図である。ＰＯＮシステム１０ｂは、ＯＬＴ２ｂおよびＯＮＵ３－１～３－Ｚを含む。ＯＬＴ２ｂは、実施の形態２のＯＬＴ２ａに対して、セレクタ部２３ａをセレクタ部２３ｂに置き換えたものである。セレクタ部２３ｂは、予備系ＰＯＮ機能部２４ｂと、予備系ＰＯＮ管理部２８ｂと、光カプラ２９－１～２９－Ｎと、を備える。予備系ＰＯＮ機能部２４ｂは、予備系ＭＡＣ制御部２５ｂと、電気スイッチ２６ｂと、光送受信器２７ｂ－１～２７ｂ－Ｎと、を備える。予備系ＰＯＮ管理部２８ｂは、ＭＡＣ管理部２８１ｂと、スイッチ管理部２８２ｂと、光送受信器管理部２８３ｂと、自己診断部２８４と、を備える。光送受信器２７ｂ－１～２７ｂ－Ｎを区別しない場合、光送受信器２７ｂと称することがある。 FIG. 5 is a block diagram of a configuration example of the OLT 2b according to the third embodiment. The PON system 10b includes an OLT 2b and ONUs 3-1 to 3-Z. The OLT 2b is obtained by replacing the selector unit 23a with a selector unit 23b with respect to the OLT 2a of the second embodiment. The selector unit 23b includes a standby PON function unit 24b, a standby PON management unit 28b, and optical couplers 29-1 to 29-N. The backup PON function unit 24b includes a backup MAC control unit 25b, an electrical switch 26b, and optical transceivers 27b-1 to 27b-N. The standby PON management unit 28b includes a MAC management unit 281b, a switch management unit 282b, an optical transceiver management unit 283b, and a self-diagnosis unit 284. When the optical transceivers 27b-1 to 27b-N are not distinguished, they may be referred to as optical transceivers 27b.
　自己診断部２８４は、定期的にセレクタ部２３ｂの異常の有無を確認するため、ＭＡＣ管理部２８１ｂ、スイッチ管理部２８２ｂ、および光送受信器管理部２８３ｂを介して、予備系ＰＯＮ機能部２４ｂ、すなわち、予備系ＭＡＣ制御部２５ｂ、電気スイッチ２６ｂ、および光送受信器２７ｂに自己診断を実施させ、自己診断の実施結果を制御部２１に通知する。 The self-diagnosis unit 284 periodically checks whether there is an abnormality in the selector unit 23b, via the MAC management unit 281b, the switch management unit 282b, and the optical transceiver management unit 283b, that is, the standby PON function unit 24b, The standby MAC control unit 25b, the electrical switch 26b, and the optical transceiver 27b are made to perform self-diagnosis, and the control unit 21 is notified of the self-diagnosis execution result.
　ＭＡＣ管理部２８１ｂは、ＭＡＣ管理部２８１の機能に加えて、予備系ＭＡＣ制御部２５ｂに自己診断を実施させる。予備系ＭＡＣ制御部２５ｂは、予備系ＭＡＣ制御部２５の機能に加えて、ＭＡＣ管理部２８１ｂの制御により自己診断を実施する。 In addition to the function of the MAC management unit 281, the MAC management unit 281b causes the standby MAC control unit 25b to perform self-diagnosis. The standby MAC control unit 25b performs self-diagnosis under the control of the MAC management unit 281b in addition to the function of the standby MAC control unit 25.
　スイッチ管理部２８２ｂは、スイッチ管理部２８２ａの機能に加えて、電気スイッチ２６ｂに自己診断を実施させる。電気スイッチ２６ｂは、電気スイッチ２６の機能に加えて、スイッチ管理部２８２ｂの制御により自己診断を実施する。 The switch management unit 282b causes the electrical switch 26b to perform self-diagnosis in addition to the function of the switch management unit 282a. In addition to the function of the electrical switch 26, the electrical switch 26b performs self-diagnosis under the control of the switch management unit 282b.
　光送受信器管理部２８３ｂは、光送受信器管理部２８３ａの機能に加えて、光送受信器２７ｂに自己診断を実施させる。光送受信器２７ｂは、光送受信器２７ａの機能に加えて、光送受信器管理部２８３ｂの制御により自己診断を実施する。 The optical transceiver manager 283b causes the optical transceiver 27b to perform self-diagnosis in addition to the function of the optical transceiver manager 283a. In addition to the function of the optical transceiver 27a, the optical transceiver 27b performs self-diagnosis under the control of the optical transceiver manager 283b.
　ＯＬＴ２ｂは、通常モードおよび自己診断モードのステータスを持つ。ＯＬＴ２ｂは、通常モードの場合、実施の形態２と同様の動作を行う。ＯＬＴ２ｂは、制御部２１からの設定情報に基づいて、例えば、１日に１回、深夜のタイミングで自己診断モードになり、自己診断を実施する。 OLT 2b has a status of normal mode and self-diagnosis mode. The OLT 2b performs the same operation as in the second embodiment in the normal mode. Based on the setting information from the control unit 21, the OLT 2 b enters the self-diagnosis mode at a late-night timing, for example, once a day, and performs self-diagnosis.
　自己診断モードの場合、Ｌ２スイッチ１からの主信号データおよびＬ２スイッチ１へ出力する主信号データを廃棄するため、自己診断部２８４は、ＭＡＣ管理部２８１ｂを介して、予備系ＭＡＣ制御部２５ｂに対して終端指示を行う。つぎに、自己診断部２８４は、正常系のＰＯＮ機能部２２－１～２２－Ｎが順に異常状態になったと仮定して、ＭＡＣ管理部２８１ｂを介して、予備系ＭＡＣ制御部２５ｂにＰＯＮ機能部２２－１～２２－ＮのＭＡＣ情報を順次通知する。同様に、自己診断部２８４は、正常系のＰＯＮ機能部２２－１～２２－Ｎが順に異常状態になったと仮定して、スイッチ管理部２８２ｂを介して、電気スイッチ２６ｂにＰＯＮ機能部２２－１～２２－Ｎの識別情報を順次通知する。これにより、予備系ＭＡＣ制御部２５ｂおよび電気スイッチ２６ｂは、ＰＯＮ機能部２２－１～２２－Ｎの代替としてＮ通りのパターンで、実施の形態１の予備系ＭＡＣ制御部２５および電気スイッチ２６と同様の動作を行う。 In the self-diagnosis mode, in order to discard the main signal data from the L2 switch 1 and the main signal data to be output to the L2 switch 1, the self-diagnosis unit 284 sends the backup MAC control unit 25b via the MAC management unit 281b. A termination instruction is given to the terminal. Next, the self-diagnosis unit 284 assumes that the normal PON function units 22-1 to 22-N are in an abnormal state in order, and then sets the PON function to the standby MAC control unit 25b via the MAC management unit 281b. The MAC information of the units 22-1 to 22-N is notified sequentially. Similarly, the self-diagnosis unit 284 assumes that the normal PON function units 22-1 to 22-N are in an abnormal state in order, and connects the PON function unit 22- to the electrical switch 26b via the switch management unit 282b. The identification information 1 to 22-N is sequentially notified. As a result, the backup MAC control unit 25b and the electrical switch 26b have N patterns as alternatives to the PON function units 22-1 to 22-N, and the backup MAC control unit 25 and the electrical switch 26 of the first embodiment The same operation is performed.
　予備系ＭＡＣ制御部２５ｂは、フレーム処理結果を、予備系ＰＯＮ管理部２８ｂの自己診断部２８４に通知する。光送受信器管理部２８３ｂは、待機モードではない通常モード時の光送受信器２７ｂの送受信パワーの情報を、自己診断結果として自己診断部２８４に通知してもよい。自己診断部２８４は、自己診断の結果、すなわちセレクタ部２３ｂで確立される予備系のルートの診断結果を制御部２１に通知する。 The standby MAC control unit 25b notifies the self-diagnosis unit 284 of the standby PON management unit 28b of the frame processing result. The optical transceiver management unit 283b may notify the self-diagnosis unit 284 of information on the transmission / reception power of the optical transceiver 27b in the normal mode that is not the standby mode as a self-diagnosis result. The self-diagnosis unit 284 notifies the control unit 21 of the self-diagnosis result, that is, the diagnosis result of the backup route established by the selector unit 23b.
　以上説明したように、本実施の形態によれば、ＯＬＴ２ｂは、自己診断部２８４の制御により、セレクタ部２３ｂを自己診断することとした。これにより、ＯＬＴ２ｂは、定期的にセレクタ部２３ｂに異常が無いか判断することができる。ＯＬＴ２ｂは、実施の形態２の効果に加えて、セレクタ部２３ｂの各構成の機能を保証することができる。 As described above, according to the present embodiment, the OLT 2b performs self-diagnosis of the selector unit 23b under the control of the self-diagnosis unit 284. As a result, the OLT 2b can periodically determine whether the selector unit 23b is normal. In addition to the effects of the second embodiment, the OLT 2b can guarantee the function of each component of the selector unit 23b.
　以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。 The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
　１　Ｌ２スイッチ、２，２ａ，２ｂ　ＯＬＴ、３－１～３－Ｚ　ＯＮＵ、９　ＯＳＳ、１０，１０ａ，１０ｂ　ＰＯＮシステム、２１　制御部、２２－１～２２－Ｎ　ＰＯＮ機能部、２３，２３ａ，２３ｂ　セレクタ部、２４，２４ａ，２４ｂ　予備系ＰＯＮ機能部、２５，２５ｂ　予備系ＭＡＣ制御部、２６，２６ｂ　電気スイッチ、２７－１～２７－Ｎ，２７ａ－１～２７ａ－Ｎ，２７ｂ－１～２７ｂ～Ｎ，２２２　光送受信器、２８，２８ａ，２８ｂ　予備系ＰＯＮ管理部、２９－１～２９－Ｎ　光カプラ、２２１　ＭＡＣ制御部、２６１　１０Ｇ送信用スイッチ、２６２　１０Ｇ受信用スイッチ、２６３　１Ｇ送信用スイッチ、２６４　１Ｇ受信用スイッチ、２８１，２８１ｂ　ＭＡＣ管理部、２８２，２８２ａ，２８２ｂ　スイッチ管理部、２８３，２８３ａ，２８３ｂ　光送受信器管理部。 1 L2 switch, 2, 2a, 2b OLT, 3-1 to 3-Z ONU, 9 OSS, 10, 10a, 10b PON system, 21 control unit, 22-1 to 22-N PON function unit, 23, 23a, 23b selector section, 24, 24a, 24b standby system PON function section, 25, 25b standby system MAC control section, 26, 26b electrical switch, 27-1 to 27-N, 27a-1 to 27a-N, 27b-1 to 27b to N, 222, optical transceiver, 28, 28a, 28b, standby PON management unit, 29-1 to 29-N optical coupler, 221 MAC control unit, 261 10G transmission switch, 262 10G reception switch, 263 1G transmission Trust switch, 264 1G reception switch, 281, 281b MAC management unit, 282, 282a, 282b switch Chi management unit, 283,283a, 283b optical transceivers management unit.

Claims (8)

  1. 　上り通信のフレームを光信号から電気信号に変換し、下り通信のフレームを電気信号から光信号に変換する複数の予備系光送受信器と、
    　前記複数の予備系光送受信器のうちの１つと接続し、１つの予備系光送受信器と上位ネットワークとの通信経路を確立する電気スイッチと、
    　正常時に使用される複数の正常系送受信部のうち異常が検出された正常系送受信部の代替として、前記上位ネットワークから取得したデータを用いて電気信号のフレームを生成して前記電気スイッチに出力し、前記電気スイッチから取得した電気信号のフレームからデータを抽出して前記上位ネットワークに出力するフレーム処理を行う予備系フレーム処理部と、
    　前記正常系送受信部の状態を監視し、異常が検出された正常系送受信部の制御情報および識別情報を出力する制御部と、
    　を備え、
    　前記予備系フレーム処理部は、前記制御情報に基づいて前記フレーム処理を行い、
    　前記電気スイッチは、前記識別情報に基づいて接続する予備系光送受信器を選択する、
    　ことを特徴とする局舎側装置。     A plurality of standby optical transceivers for converting an upstream communication frame from an optical signal to an electrical signal, and converting a downstream communication frame from an electrical signal to an optical signal;
    An electrical switch connected to one of the plurality of standby optical transceivers and establishing a communication path between one standby optical transceiver and a higher-level network;
    As an alternative to a normal transmission / reception unit in which an abnormality is detected among a plurality of normal transmission / reception units used at normal time, an electrical signal frame is generated using data acquired from the upper network and output to the electrical switch A standby frame processing unit for performing frame processing for extracting data from a frame of an electrical signal acquired from the electrical switch and outputting the data to the upper network;
    A control unit that monitors the state of the normal transmission / reception unit and outputs control information and identification information of the normal transmission / reception unit in which an abnormality is detected;
    With
    The backup frame processing unit performs the frame processing based on the control information,
    The electrical switch selects a standby optical transceiver to be connected based on the identification information;
    A station side device characterized by that.
  2. 　前記複数の予備系光送受信器と同数の光カプラを備え、
    　前記光カプラは、各々が、ユーザ側装置から受信した光信号のフレームを接続する予備系光送受信器および正常系送受信部に分岐し、接続する予備系光送受信器または正常系送受信部から取得した光信号のフレームを前記ユーザ側装置に送信する、
    　ことを特徴とする請求項１に記載の局舎側装置。     The same number of optical couplers as the plurality of standby optical transceivers,
    Each of the optical couplers is branched into a standby optical transceiver and a normal transmission / reception unit for connecting a frame of an optical signal received from a user side device, and is acquired from a standby optical transceiver or a normal transmission / reception unit to be connected. Transmitting a frame of an optical signal to the user side device;
    The station side apparatus of Claim 1 characterized by the above-mentioned.
  3. 　前記電気スイッチは、通信速度毎にフレームの送信用の複数のスイッチおよび受信用の複数のスイッチを備える、
    　ことを特徴とする請求項１または２に記載の局舎側装置。     The electrical switch includes a plurality of switches for transmitting frames and a plurality of switches for receiving for each communication speed.
    The station building side apparatus according to claim 1 or 2, characterized in that.
  4. 　前記制御部から前記制御情報および前記識別情報を取得し、前記制御情報を前記予備系フレーム処理部に通知し、前記識別情報を前記電気スイッチに通知する予備系光送受信部管理部、
    　を備えることを特徴とする請求項１から３のいずれか１つに記載の局舎側装置。     Obtaining the control information and the identification information from the control unit, notifying the control information to the protection frame processing unit, and notifying the identification information to the electrical switch;
    The station side apparatus according to any one of claims 1 to 3, further comprising:
  5. 　前記予備系光送受信部管理部は、前記複数の予備系光送受信器の各々から、光信号のフレームを送信した時の送信信号強度の情報、および光信号のフレームを受信した時の受信信号強度の情報を取得し、前記複数の予備系光送受信器の状態を監視する、
    　ことを特徴とする請求項４に記載の局舎側装置。     The standby optical transmitter / receiver management unit is configured to transmit information on transmission signal strength when an optical signal frame is transmitted and received signal strength when an optical signal frame is received from each of the plurality of standby optical transceivers. And monitoring the status of the plurality of standby optical transceivers,
    The station side apparatus of Claim 4 characterized by the above-mentioned.
  6. 　前記予備系光送受信部管理部は、前記複数の予備系光送受信器のうち前記電気スイッチで選択されていない予備系光送受信器を、低消費電力の待機モードにする、
    　ことを特徴とする請求項４または５に記載の局舎側装置。     The standby optical transmitter / receiver management unit sets a standby optical transmitter / receiver not selected by the electrical switch among the plurality of standby optical transmitter / receivers to a standby mode with low power consumption,
    The station building side device according to claim 4 or 5, characterized in that.
  7. 　前記予備系光送受信部管理部は、前記複数の予備系光送受信器、前記電気スイッチ、および前記予備系フレーム処理部に自己診断を実施させる、
    　ことを特徴とする請求項４から６のいずれか１つに記載の局舎側装置。     The standby optical transceiver management unit causes the plurality of standby optical transceivers, the electrical switch, and the standby frame processing unit to perform self-diagnosis,
    The station side apparatus according to any one of claims 4 to 6, wherein
  8. 　制御部が、正常時に使用される複数の正常系送受信部の状態を監視し、異常が検出された正常系送受信部の制御情報および識別情報を出力する監視ステップと、
    　予備系フレーム処理部が、前記制御情報に基づいて、前記異常が検出された正常系送受信部の代替として、上位ネットワークから取得したデータを用いて電気信号のフレームを生成して電気スイッチに出力し、前記電気スイッチから取得した電気信号のフレームからデータを抽出して前記上位ネットワークに出力するフレーム処理ステップと、
    　前記電気スイッチが、前記識別情報に基づいて、複数の予備系光送受信器から接続する１つの予備系光送受信器を選択し、１つの予備系光送受信器と上位ネットワークとの通信経路を確立する接続ステップと、
    　を含むことを特徴とする通信方法。     A monitoring step for monitoring a state of a plurality of normal transmission / reception units used in a normal state, and outputting control information and identification information of a normal transmission / reception unit in which an abnormality is detected;
    Based on the control information, the standby frame processing unit generates an electric signal frame using data acquired from the upper network as an alternative to the normal transmission / reception unit in which the abnormality is detected, and outputs the frame to the electric switch. A frame processing step of extracting data from a frame of an electrical signal acquired from the electrical switch and outputting the data to the upper network;
    The electrical switch selects one standby optical transmitter / receiver to be connected from a plurality of standby optical transmitters / receivers based on the identification information, and establishes a communication path between the single standby optical transmitter / receiver and the upper network. A connection step;
    A communication method comprising:
PCT/JP2017/011529 2017-03-22 2017-03-22 Station-side device and communication method WO2018173166A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009225338A (en) * 2008-03-18 2009-10-01 Oki Electric Ind Co Ltd Point-to-multipoint optical communication system
JP2009246446A (en) * 2008-03-28 2009-10-22 Sumitomo Electric Ind Ltd Station side device, control method thereof and computer program thereof
JP2014230161A (en) * 2013-05-23 2014-12-08 日本電信電話株式会社 Optical switch module and optical switching device
JP2016143950A (en) * 2015-01-30 2016-08-08 富士通株式会社 PON system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009225338A (en) * 2008-03-18 2009-10-01 Oki Electric Ind Co Ltd Point-to-multipoint optical communication system
JP2009246446A (en) * 2008-03-28 2009-10-22 Sumitomo Electric Ind Ltd Station side device, control method thereof and computer program thereof
JP2014230161A (en) * 2013-05-23 2014-12-08 日本電信電話株式会社 Optical switch module and optical switching device
JP2016143950A (en) * 2015-01-30 2016-08-08 富士通株式会社 PON system

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