JP7447693B2 - Home equipment, communication equipment, PON system, and notification method of power outage - Google Patents

Description

The present invention relates to a home device, a communication device, a PON system, and a power-off notification method.

Patent Document 1 describes an OLT (Optical Line Terminal), a plurality of pluggable ONUs (Optical Network Units) that comply with the MSA (Multi Source Agreement) standard, which are connected by an OLT and a PON line, and a pluggable ONU that can be inserted. A PON (Passive Optical Network) system is described that includes a line concentrator having a plurality of physical ports.

The line concentrator includes a DC/DC converter that supplies power to the ONU, a capacitor connected to the input side of the DC/DC converter, and a detection unit that outputs a power-off detection signal. Dedicated pins are assigned for transmitting detection signals.
When the arithmetic processing unit of the ONU receives a power-off detection signal from the detection unit of the line concentrator, it generates a control frame to notify the OLT of the power-off of its own device, and uses the generated control frame for PON communication. It is sent to the communication control unit of

Japanese Patent Application Publication No. 2010-252192

In the PON system of Patent Document 1, the detection signal of a power-off of the line concentrator is transmitted to the ONU through a dedicated pin of the MSA module, so it is necessary to implement a dedicated arithmetic processing unit that can receive the detection signal in the ONU, and manufacturing There is a problem in that the cost is high.
In view of the conventional problems, it is an object of the present disclosure to enable a station-side device to be notified of power-off of a pluggable home-side device without employing dedicated hardware components.

A device according to an aspect of the present disclosure is a pluggable home-side device that configures a PON system together with a station-side device, and includes an optical transceiver, a PON processing section connected to the optical transceiver, and a PON processing section connected to the optical transceiver. a PHY processing unit connected to the PHY processing unit; and a terminal module connected to the PHY processing unit, the terminal module being supplied with power from the power supply unit of the communication device when connected to a physical port of the communication device, The PON processing unit converts the following first frame inputted from the PHY processing unit into the following second frame, and outputs the converted second frame to the optical transceiver.

1st frame: Control frame for notifying power-off of communication device 2nd frame: Control frame for notifying power-off of home-side device

A device according to another aspect of the present disclosure is a communication device that communicates with a pluggable home device that configures a PON system together with a central office device, and includes one or more physical ports to which the home device can be connected; A management control unit that manages the connected home-side devices; a relay processing unit that relays communication frames transmitted and received by the home-side devices and the management control unit; and a power supply unit capable of continuing power supply for a predetermined period of time after the power is turned off, and the management control unit is configured to notify the power off of the own device when detecting the power off of the own device. A control frame is generated and transmitted to the home device.

A device according to another aspect of the present disclosure is a communication device that communicates with a pluggable home device that configures a PON system together with a central office device, and includes one or more physical ports to which the home device can be connected; A management control unit that manages the connected home-side devices; a relay processing unit that relays communication frames transmitted and received by the home-side devices and the management control unit; and a power supply section for supplying power, and the management control section generates a control frame for notifying the power off of the own device when detecting an off operation of the power switch of the own device, and sends the generated control frame to the home device. Send.

A system according to an aspect of the present disclosure includes a station-side device, a pluggable home-side device connected to the station-side device via a PON line, and one or more physical ports to which the home-side device can be connected. A PON system comprising the above-mentioned communication device, wherein the communication device that supplies power to the home-side device generates the first frame when it detects a power-off of its own device or an OFF operation of a power switch. The home device, which has received the first frame from the communication device, converts the received first frame into the second frame, and converts the converted second frame into the second frame. Send to station side equipment.

A method according to an aspect of the present disclosure includes a station-side device, a pluggable home-side device connected to the station-side device via a PON line, and one or more physical ports to which the home-side device can be connected. A notification method of a power outage in a PON system comprising a communication device, wherein when the communication device that supplies power to the home device detects a power outage of its own device or an off operation of a power switch, generating and transmitting a first frame to the home device; the home device receiving the first frame from the communication device converting the received first frame into the second frame; transmitting the converted second frame to the station-side device.

According to the present disclosure, it is possible to notify the station-side device of a power-off of a pluggable home-side device without employing a dedicated hardware component.

FIG. 1 is a schematic diagram showing an example of the overall configuration of an optical communication system. FIG. 2 is a block diagram showing an example of the internal configuration of the OLT, pluggable ONU, and HGW. FIG. 3A is a sequence diagram illustrating an example of a method for acquiring node information by HGW. FIG. 3B is a diagram showing an example of a management table of node information held by the HGW. FIG. 4 is a sequence diagram showing an example of a power-off notification method (notification method 1) executed by the HGW and the pluggable ONU. FIG. 5 is a sequence diagram showing another example of a power-off notification method (notification method 2) executed by the HGW and the pluggable ONU. FIG. 6 is a diagram illustrating an example of an ONU determination table held by the HGW. FIG. 7 is a block diagram showing another example of the internal configuration of the OLT, pluggable ONU, and HGW.

<Summary of embodiments of the present invention>
Hereinafter, an overview of the embodiments of the present invention will be listed and explained. Note that at least some of the embodiments described below may be combined arbitrarily.

(1) The home device of this embodiment is a pluggable home device that configures a PON system together with the central office device, and includes an optical transceiver, a PON processing unit connected to the optical transceiver, and a PON processing unit connected to the optical transceiver. and a terminal module connected to the PHY processing unit, which is supplied with power from the power supply unit of the communication device when connected to a physical port of the communication device. , the PON processing unit converts the following first frame input from the PHY processing unit into the following second frame, and outputs the converted second frame to the optical transceiver.
1st frame: Control frame for notifying power-off of communication device 2nd frame: Control frame for notifying power-off of home-side device

According to the home device of this embodiment, since the first frame is input from the PHY processing section to the PON processing section, the first frame can be transmitted to the PON processing section through the same transmission route as a normal communication frame. Further, since the PON processing section converts the first frame into a second frame and outputs the converted second frame to the optical transceiver, the second frame can be transmitted to the station-side device.
Therefore, it is possible to notify the office-side device of a power-off of the pluggable home-side device without employing any dedicated hardware components.

(2) In the home device of this embodiment, the first frame is a unique control frame used between the communication device and the home device, and the second frame is an extended OAM frame. In this case, the frame conversion process executed by the PON processing unit may be a process of uniquely generating the second frame in response to the input of the first frame.
In this case, since the second frame generated by the PON processing unit is an extended OAM frame, it is possible to reliably notify the station-side device of the power-off of the home-side device.

(3) In the home device of this embodiment, when the first and second frames are extended OAM frames, the frame conversion process executed by the PON processing unit is The process may be performed to rewrite the address information to the address information of the own device.
In this case, since the second frame can be generated by simply rewriting the address information, it is possible to more quickly notify the station-side device of the power-off of the home-side device, compared to the case where the second frame is generated independently.

(4) The communication device of this embodiment is a communication device that communicates with a pluggable home device that constitutes a PON system together with a central office device, and has one or more physical ports to which the home device can be connected. , a management control unit that manages the connected home-side device; a relay processing unit that relays communication frames transmitted and received by the previous home-side device and the management control unit; and a power supply unit capable of continuing the power supply for a predetermined period of time after the power is turned off, and the management control unit notifies the power-off of the own device when detecting the power-off of the own device. A control frame is generated and transmitted to the home device.

According to the communication device of this embodiment, when the management control unit detects a power outage of the device (such as turning off a power switch, disconnecting an AC adapter, disconnecting an outlet, or a power outage), Since a control frame for notifying the disconnection is generated and sent to the home device, the control frame can be transmitted to the home device through the same transmission route as a normal communication frame.
In this way, it is possible to reliably notify the plastic-type home-side device of the power-off of the communication device, so that the home-side device can notify the station-side device of its own power-off.

(5) The communication device of this embodiment is a communication device that communicates with a pluggable home device that constitutes a PON system together with a central office device, and has one or more physical ports to which the home device can be connected. , a management control unit that manages the connected home device; a relay processing unit that relays communication frames transmitted and received by the home device and the management control unit; and a relay processing unit that relays communication frames transmitted and received by the home device and the management control unit; a power supply unit that supplies power to the home-side device, and the management control unit generates a control frame for notifying the power-off of the home-side device when detecting an off operation of the power switch of the home-side device. Send to.

According to the communication device of this embodiment, when the management control unit detects an off operation of the power switch of the own device, the management control unit generates a control frame for notifying the power off of the own device and sends it to the home device. Therefore, the control frame can be transmitted to the home device through the same transmission route as normal communication frames.
Therefore, it is possible to notify the pluggable home-side device of the power-off of the communication device without employing a dedicated hardware component.

(6) In the communication device of the present embodiment, the management control unit controls the control frame only for the home device that can convert the control frame into a control frame for notifying power-off of the home device. Preferably, the frame is transmitted.
In this way, the control frame will not be sent to the home device that is not compatible with the above frame conversion process, so that malfunctions that may occur in the home device that is not compatible with the above frame conversion process can be prevented. This can be prevented.

(7) The PON system of this embodiment is a system that is a combination including the above-mentioned residential devices (1) to (3) and the above-mentioned communication devices (4) to (6).
Therefore, the PON system of this embodiment has the same effects as the home devices (1) to (3) described above and the communication devices (4) to (6) described above.

(8) The notification method of this embodiment is a notification method executed by the home devices described in (1) to (3) above and the communication devices described in (4) to (6) described above in cooperation. .
Therefore, the notification method of the present embodiment has the same effects as the home-side devices (1) to (3) described above and the communication devices (4) to (6) described above.

<Details of embodiments of the present invention>
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that at least some of the embodiments described below may be combined arbitrarily.

[Overall configuration of optical communication system]
FIG. 1 is a schematic diagram showing an example of the overall configuration of an optical communication system.
As shown in FIG. 1, the optical communication system of this embodiment includes a PON system including a station-side device 1, a home-side device 2, a home gateway 3, and the like.

The station-side device 1 is an optical line terminal (OLT) connected to the upper side of the PON line 4. The home device 2 is an optical line terminal unit (ONU) located on the lower side of the PON line 4.
Hereinafter, the station-side device 1 will be referred to as "OLT1," the home-side device 2 will be referred to as "ONU2," and the home gateway 3 will be referred to as "HGW3."

The PON of this embodiment is, for example, a PON (such as GE-PON or 10G-EPON) that complies with IEEE communication standards.
The PON of this embodiment may be a PON (eg, G-PON, XG-PON, XGS-PON, or NG-PON2) that complies with ITU-T communication standards.

The OLT 1 is installed, for example, in a communications carrier's office building. OLT1 is connected to the upper network. The ONU 2 and the HGW 3 are installed, for example, in a building of a communication service subscriber (user).
The ONU 2 includes a "pluggable type ONU 2A" which is relatively small in size and complies with the MSA (Multi-Source Agreement) standard, and a "stationary type ONU 2B" which is relatively large in size and does not conform to the MSA standard.

The MSA standard is, for example, "SFP" (Small Form-factor Pluggable), "SFP+" (Small Form-factor Pluggable Plus), or "XFP" (10 Gigabit Small Form-factor Pluggable).
In the following, the "pluggable ONU 2A" may be abbreviated as "ONU2A", and the "stationary ONU 2B" may be abbreviated as "ONU2B". Items common between ONU2A and ONU2B will be described as "ONU2" using the common code "2".

The HGW 3 has at least one slot-in type physical port P1 to which the pluggable ONU 2A can be connected, and at least one physical port P2 to which a communication cable such as a LAN cable can be connected.
HGW3 has Ethernet ("Ethernet" is a registered trademark) communication function that complies with 10/100/1000BASE-T, etc., L2/L3 layer network function, QoS (Quality of Service) function, and VLAN (Virtual LAN). ) functions etc.

One or more pluggable ONUs 2A and one or more user terminals 5 are connected to the HGW 3. One or more user terminals 5 are connected to the stationary ONU 2A.
The user terminal 5 is comprised of a computer device such as a personal computer that is capable of Ethernet communication. The user terminal 5 may be connected to the HGW 3 or ONU 2B via a relay network (not shown).

The PON line 4 is composed of a tree-structured optical line in which optical fibers are branched by an optical splitter 6. The OLT 1 is connected to the main fiber 7 of the PON line 4, and the ONU 2 is connected to the branch fiber 8 of the PON line 4.
The optical splitter 6 passively splits or multiplexes an input optical signal without requiring power supply.

The downlink optical signal sent out by the OLT 1 is split at the optical splitter 6 and transmitted to each ONU 2 through the branch fiber 8 . Upstream optical signals sent out by each ONU 2 are converged at an optical splitter 6 and transmitted to the OLT 1 through a trunk fiber 7.
Since the upstream optical signals sent out by the ONUs 2 are combined at the optical splitter 6, multiplexing is required to prevent upstream optical signals of the same wavelength from colliding after merging. For this reason, time division multiplexing based on MPCP (Multi-Point Control Protocol) is performed in PON.

Specifically, the ONU 2 transmits a control frame (report) in which the length of data in its own buffer (transmission request amount) is written to the OLT 1.
The OLT 1 calculates the upstream transmission start time and transmission time length to be instructed to each ONU 2 based on the reports collected from the ONUs 2 under its control. The OLT 1 transmits a control frame (gate) containing the calculation result to each ONU 2.

Each ONU 2 transmits data corresponding to the transmission time length designated by the gate to the OLT 1 at the transmission start time designated by the gate. At the same time, the ONU 2 transmits the next transmission request amount together with a report to the OLT 1.
Further, the OLT 1 executes P2MP (Point To Multi Point) discovery, and when detecting the connection of the ONU 2 to the PON line 4, executes a registration process for the detected ONU 2. At this time, an LLID (Logical Link ID) is assigned to the ONU 2.

Since the PON system complies with Ethernet, the OLT 1 has an OAM (Operations, Administration and Maintenance) function that complies with the Ethernet standard.
For this reason, the OLT 1 uses, for example, normal OAM frames specified in Clause 57 of IEEE 802.3-2008, and extended OAM frames that can be independently defined by communication carriers for the purpose of maintenance management, in the communication equipment to be managed. Transmits and receives data to and from a certain ONU2.

In the optical communication system of FIG. 1, the stationary ONU 2B may not be connected to the PON line 4, and only the pluggable ONU 2A may be accommodated in the OLT 1.
Moreover, the number of pluggable ONUs 2A connected to one HGW 3 is not limited to one, and may be two or more.

[Internal configuration of OLT]
FIG. 2 is a block diagram showing an example of the internal configuration of the OLT 1, the pluggable ONU 2A, and the HGW 3.
As shown in FIG. 2, the OLT 1 includes an optical transceiver (TRx) 11, a PON processing section 12, an L2 switch 13, and a management control section 14. The management control unit 14 includes a CPU (Central Processing Unit), a memory, and the like.

The optical transceiver 11 is an optical device including a subassembly (eg, Bidirectional Optical Sub-Assembly) that mutually converts optical signals and electrical signals. The optical transceiver 11 is optically connected to the PON line 4 and electrically connected to the PON processing section 12 .
The optical transceiver 11 converts an uplink optical signal inputted from the PON line 4 into an electrical signal and inputs it to the PON processing unit 12, converts the electrical signal inputted from the PON processing unit 12 into a downlink optical signal, and converts the electrical signal inputted from the PON processing unit 12 into a downlink optical signal. Send to 4.

The PON processing unit 12 is composed of an integrated circuit (for example, a MAC chip for OLT) that executes predetermined communication processing based on the PON communication standard.
If the upstream frame input from the optical transceiver 11 is a report, the PON processing unit 12 calculates the upstream transmission start time and transmission time length of the ONU 2 . The PON processing unit 12 generates a gate addressed to a predetermined LLID (ONU 2) including the calculation result, and outputs the generated gate to the optical transceiver 11.

The PON processing unit 12 also executes P2MP discovery and registration processing of the ONU 2, and transmission and reception of OAM frames that manage the ONU 2.
If the upstream frame input from the optical transceiver 11 is a user frame, the PON processing unit 12 outputs the user frame to the L2 switch 13.
If the downlink frame input from the L2 switch 13 is a user frame, the PON processing unit 12 outputs the user frame to the optical transceiver 11.

The L2 switch 13 is composed of an integrated circuit such as an FPGA (Field Programmable Gate Array) that determines an output port according to the destination of an L2 layer frame input thereto.
When the downlink frame input from the upper network is a user frame, the L2 switch 13 outputs the downlink frame to the PON processing unit 12.
If the upstream frame input from the PON processing unit 12 is a user frame, the L2 switch 13 sends the user frame to the upper network.

The management control unit 14 is connected to the L2 switch 13 and the PON processing unit 12. The management control unit 14 is also communicably connected to a management terminal 15 of a communication carrier. The management terminal 15 may communicate with the management control unit 14 through an upper network.
The management control unit 14 can set QoS (Quality of Service) parameters (for example, maximum communication band) of the L2 switch 13. The L2 switch 13 adjusts the amount of data communication of the user frame so that the set parameter value is achieved.

The management terminal 15 can transmit setting information of the OLT 1 and ONU 2 to the management control unit 14. Upon receiving the configuration information of the OLT 1, the management control unit 14 adjusts the parameters of each unit of the own device according to the received configuration information.
Upon receiving the configuration information of the ONU 2, the management control unit 14 outputs the received configuration information to the PON processing unit 12. The PON processing unit 12 generates a control frame (for example, an extended OAM frame) containing configuration information of the ONU 2 and outputs it to the optical transceiver 11.

The setting information of the ONU 2 includes, for example, at least one of the following information 1 to 4.
Information 1: Setting parameters of the MAC chip of the ONU 2 Information 2: Authentication information (password, etc.) for the user terminal 5 that communicates with the ONU 2
Information 3: Encryption key used between OLT/ONU Information 4: Setting information for queue buffer size included in ONU 2

[Internal configuration of pluggable ONU]
As shown in FIG. 2, the pluggable ONU 2A includes an optical transceiver (TRx) 21, a PON processing section 22, a PHY (physical layer) processing section 23, and a terminal module (terminal section) 24. The terminal module 24 is comprised of a connector having a predetermined structure and number of terminals that conform to a predetermined MSA standard.

The physical port P1 includes a power terminal to which the power supply unit of the HGW 3 applies voltage, and the terminal module 24 has a terminal connected to the power terminal of the physical port P1.
Therefore, when the ONU 2A is inserted into the physical port P1 of the HGW 3 and the terminal module 24 is properly connected, power is supplied from the power supply section of the HGW 3 to the ONU 2A. That is, each section 21 to 23 within the ONU 2A is driven by power supplied from the power supply section of the HGW 3.

The optical transceiver 21 is an optical device including a subassembly (eg, Bidirectional Optical Sub-Assembly) that mutually converts optical signals and electrical signals. The optical transceiver 21 is optically connected to the PON line 4 and electrically connected to the PON processing section 22 .
The optical transceiver 21 converts the downlink optical signal inputted from the PON line 4 into an electrical signal and inputs it to the PON processing unit 22, converts the electrical signal inputted from the PON processing unit 22 into an upstream optical signal, and converts the electrical signal inputted from the PON processing unit 22 into an uplink optical signal to connect the PON line. Send to 4.

The PON processing unit 22 is composed of an integrated circuit (for example, a MAC chip for ONU) that executes predetermined communication processing based on the PON communication standard.
The PON processing unit 22 generates a report that describes the data length in its own buffer, and outputs it to the optical transceiver 21. If the downlink frame input from the optical transceiver 21 is a gate, the PON processing unit 22 generates a user frame including the data currently being accumulated in the buffer and outputs it to the optical transceiver 21 according to the instructions written on the gate. do.

If the downlink frame input from the optical transceiver 21 is a user frame, the PON processing unit 22 outputs the user frame to the PHY processing unit 23 .
When the upstream frame input from the PHY processing unit 23 is a user frame, the PON processing unit 22 temporarily stores data included in the user frame in a buffer.

The PHY processing unit 23 is composed of an integrated circuit (for example, a PHY chip) that performs signal conversion and communication processing in the physical layer.
The PHY processing unit 23 converts the electrical signal input from the HGW 3 into a layer 2 electrical signal, and outputs the converted electrical signal to the PON processing unit 22. The PHY processing unit 23 converts the downlink frame input from the PON processing unit 22 into a layer 1 electrical signal, and sends the converted electrical signal to the HGW 3.

[Internal configuration of HGW]
As shown in FIG. 2, the HGW 3 includes an upper-side transmitting/receiving section 31, a frame processing section 32, a lower-side transmitting/receiving section 33, and a management control section 34. The management control unit 34 is composed of a CPU, memory, and the like.
The upper-side transmitter/receiver 31 is connected to a slot-in type physical port P1, and the lower-side transmitter/receiver 33 is connected to a LAN cable physical port P2. In FIG. 2, a case is illustrated in which there is one transmitting/receiving section 31, 33, but there may be two or more.

The upper-side transmitter/receiver 31 is composed of an integrated circuit (for example, a PHY chip) that performs signal conversion and communication processing in the physical layer.
The upper-side transmitting/receiving unit 31 converts the electrical signal input from the ONU 2A into a layer 2 electrical signal, and outputs the converted electrical signal to the frame processing unit 32. The upper-side transmitting/receiving unit 31 converts the electrical signal input from the frame processing unit 32 into a layer 1 electrical signal, and sends the converted electrical signal to the ONU 2A.

The lower-side transmitter/receiver 33 is composed of an integrated circuit (for example, a PHY chip) that performs signal conversion and communication processing in the Ethernet physical layer conforming to 10/100/1000BASE-T or the like.
The lower transmitter/receiver 33 converts the electrical signal input from the user terminal 5 into a layer 2 electrical signal, and outputs the converted electrical signal to the frame processor 32 . The lower transmitter/receiver 33 converts the electrical signal input from the frame processor 32 into a layer 1 electrical signal, and sends the converted electrical signal to the user terminal 5.

The frame processing unit 32 is composed of an integrated circuit such as an FPGA that determines an output port according to the type and destination of the L2 layer frame input thereto.
The management control unit 34 is connected to the frame processing unit 32. The management control unit 34 is capable of management communication using OAM or the like with the management control unit 14 of the OLT 1 and the PON processing units 12 and 22 of the OLT/ONU.

The upper-side transmitting/receiving unit 31, the frame processing unit 32, and the lower-side transmitting/receiving unit 33 function as a relay processing unit that relays communication frames transmitted and received by the connected ONU 2A, the connected user terminal 5, and the management control unit 34. . Specifically, it is as follows.

If the downlink frame input from the upper-side transceiver 31 is a user frame, the frame processing unit 32 outputs the user frame to the lower-side transceiver 33.
If the downlink frame input from the upper-side transmitter/receiver 31 is a control frame such as OAM, the frame processor 32 outputs the control frame to the management controller 34 .

If the uplink frame input from the lower-side transmitting/receiving section 33 is a user frame, the frame processing section 32 outputs the user frame to the upper-side transmitting/receiving section 31 .
If the uplink frame input from the lower transmitter/receiver 33 is a control frame such as OAM, the frame processor 32 outputs the control frame to the management controller 34 .

If the communication frame input from the management control unit 34 is a control frame such as OAM for the ONU 2A, the frame processing unit 32 outputs the input control frame to the upper-side transmitting/receiving unit 31.
If the communication frame input from the management control unit 34 is a control frame such as OAM for the user terminal 5, the frame processing unit 32 outputs the input control frame to the lower-side transmitting/receiving unit 33.

The frame processing unit 32 appropriately selects an output port for a user frame depending on the destination of the frame.
When the management control unit 34 outputs the control frame to the frame processing unit 32, it specifies the output destination of the control frame to the frame processing unit 32. Therefore, the frame processing unit 32 relays the control frame input from the management control unit 34 to the output port designated by the management control unit 34.

[HGW power supply section]
As shown in FIG. 2, the HGW 3 includes a power conversion section 35, an off-delay circuit 36, and a power-off sensor 37 as a power supply section of its own device.
The power converter 35 includes, for example, a DC/DC converter. Direct current of a predetermined voltage is input to the power converter 35 from the AC adapter 38 . The power converter 35 is turned on/off by a power switch 39.

The power converter 35 steps down the DC voltage input from the AC adapter 38 and outputs it to the off-delay circuit 36 . The output side of the off-delay circuit 36 is connected to each section 31 to 34 in the HGW 3 and the power terminal of the slot-in type physical port P1.
Therefore, the off-delay circuit 36 applies an output voltage to each part 31 to 34 within the device itself, and also applies an output voltage to a predetermined terminal included in the terminal module 24 of the pluggable ONU 2A connected to the physical port P1. do.

The off-delay circuit 36 has a power storage element such as a capacitor, and when the input from the power converter 35 stops, continues to output a DC voltage until a predetermined time (for example, 100 to 300 ms) has elapsed since the input stopped.
Therefore, even if the power supply to the power converter 35 is cut off due to turning off the power switch 39, disconnecting the AC adapter 38, disconnecting the outlet, or due to a power outage, each unit 31 to 34 of the HGW 3 and the ONU 2A will remain in operation for a predetermined period of time. Operation can continue.

The power-off sensor 37 is, for example, a voltage sensor that detects the output voltage of the power converter 35 and outputs a detection signal to the management controller 34. When the output voltage of the power conversion unit 35 becomes less than a predetermined threshold value (for example, 0.1V), the management control unit 34 determines that the power of the own device is turned off.
In this way, in the HGW 3 of FIG. 2, the events that can cause a power outage that can be detected by the management control unit 34 include not only the OFF operation of the power switch 39, but also the removal of the AC adapter 38, the removal of an outlet, and a power outage. included.

When the management control unit 34 detects a power-off of its own device, it generates a control frame for notifying the power-off of its own device, and transmits the generated control frame to the ONU 2A and user terminal 5 that are connected to its own device. can do.

[How to obtain node information]
FIG. 3A is a sequence diagram illustrating an example of a method for acquiring node information by the HGW 3.
As shown in FIG. 3, when the management control unit 34 of the HGW 3 detects the connection of a communication device to the physical port P1 (step S11), it executes predetermined control communication (step S12), and from the communication partner (ONU 2A) The acquired node information is held in memory (step S13).
The control communication in step S12 is performed by, for example, I2C (Inter-Integrated Circuit) communication or the transmission and reception of an information OAM frame.

FIG. 3B is a diagram showing an example of the node information management table 40 held by the HGW 3.
As shown in FIG. 3B, the management table 40 consists of tabular data including, for example, columns of "port number,""devicetype,""MACaddress,""productID," and "vendor."
The "device type", "MAC address", "product ID", and "vendor" are examples of node information of the communication device that the management control unit 34 acquires through control communication.

"Port number" indicates the number value of the physical port Pi that detected the connection, "Device type" indicates the type of communication device that detected the connection, and "MAC address" indicates the number of the physical port Pi that detected the connection. The address information of the MAC address of the communication device is recorded.
"Product ID" indicates the product number of the communication device that detected the connection, and "Vendor" indicates the manufacturer of the communication device that detected the connection.

[Power cutoff notification method 1]
FIG. 4 is a sequence diagram showing an example of a power-off notification method (notification method 1) executed by the HGW 3 and the pluggable ONU 2A.
Notification method 1 in FIG. 4 is a method in which unique control frames are transmitted and received between the HGW and ONU, and extended OAM frames are transmitted and received between the ONU and OLT. Specifically, it is as follows.

As shown in FIG. 4, when the management control unit 34 of the HGW 3 detects a power outage of its own device (step S21), it generates a unique control frame for notifying the ONU 2A of the power outage (step S22). (Step S23).
The above control frame is, for example, an Ethernet frame in which DA=address information of ONU 2A, SA=address information of HGW 3, Length/type=0xfff, and includes an event ID indicating power-off in the data area.

Therefore, the above control frame is input from the terminal module 24 to the PHY processing unit 23 in the ONU 2A, converted into a layer 2 electrical signal by the PHY processing unit 23, and input to the PON processing unit 22.
Note that the management control unit 34 refers to the management table 40 stored in the memory and determines the address information of the ONU 2A to be written in the DA of the control frame.

When the PON processing unit 22 of the pluggable ONU 2A receives the above control frame, it generates an extended OAM frame for notifying the OLT 1 of the power-off (step S24), and transmits it to the management control unit 14 of the OLT 1 (step S25). ).
The above-mentioned extended OAM frame is composed of, for example, DA=multicast address information for slow protocol, SA=address information of ONU 2A, and event ID=power-off (Dying Gasp).

[Power outage notification method 2]
FIG. 5 is a sequence diagram showing another example of a power-off notification method (notification method 2) executed by the HGW 3 and the pluggable ONU 2A.
Notification method 2 in FIG. 5 is a method of transmitting and receiving extended OAM frames between HGW and ONU, and also transmitting and receiving extended OAM frames between ONU and OLT. Specifically, it is as follows.

As shown in FIG. 5, when the management control unit 34 of the HGW 3 detects a power outage of its own device (step S31), it generates an extended OAM frame to notify the ONU 2A of the power outage (step S32). The information is transmitted to the PON processing unit 22 (step S33).
The above-mentioned extended OAM frame is composed of, for example, DA=multicast address information for slow protocol, SA=HGW address information, and event ID=power-off (Dying Gasp).

Therefore, the above extended OAM frame is input from the terminal module 24 to the PHY processing section 23 in the ONU 2A, converted into a layer 2 electrical signal by the PHY processing section 23, and inputted to the PON processing section 22.

When the PON processing unit 22 of the pluggable ONU 2A receives the above-mentioned extended OAM frame, it executes a transmission source rewriting process on the extended OAM frame (step S34), and sends the processed OAM frame to the management control unit 14 of the OLT 1. (step S35).
The above rewriting process is a process in which the PON processing unit 22 of the ONU 2A rewrites the source address of the extended OAM frame received from the HGW 3 to the address information of the own device (ONU 2A).

[How to limit the notification target of power outage]
As described above, in the PON system of this embodiment, the HGW 3 transmits the following first frame to the ONU 2A, and the ONU 2A converts the received first frame into the following second frame and transmits it to the OLT 1. The first frame is a proprietary control frame or an extended OAM frame, and the second frame is an extended OAM frame.
1st frame: Control frame for notifying power-off of HGW3 2nd frame: Control frame for notifying power-off of ONU2A

Here, if the ONU 2A is a communication device that is not compatible with the above frame conversion process, a control frame that cannot be interpreted on the receiving side will be transmitted to the ONU 2A, which may cause the ONU 2A to malfunction.
Therefore, in order to prevent the above malfunction, it is determined whether the ONU 2A is a communication device that supports the above frame conversion processing, and the first frame is sent only to the ONU 2A that supports it. It is preferable not to transmit the first frame to the ONU 2A.

FIG. 6 is a diagram showing an example of the determination table 41 of the ONU 2A held by the HGW 3. The determination table 41 is registered in advance in the memory of the management control unit 34.
As shown in FIG. 6, the determination table 40 consists of tabular data including, for example, columns of "product ID,""vendor," and "support status." An ONU 2A whose compatibility status is "compatible" means that frame conversion processing is possible, and an ONU 2A whose compatibility status is "non-compatible" means that frame conversion processing is not possible or whether frame conversion processing is possible is unknown.

In this case, the management control unit 34 of the HGW 3 searches the determination table 41 using the "product ID" and "vendor" identification information included in the management table 40 as keys, and the ONU 2A connected to its own device performs frame conversion processing. It is only necessary to determine whether or not it is compatible.
In the management table 40 of FIG. 3B, the product ID of the ONU 2A connected to the HGW 3 is AAA1234, and the vendor is Company A. Further, in the determination table 41 of FIG. 6, the "support status" of the product ID=AAA1234 and the vendor=company A is "supported".

Therefore, the management control unit 34 of the HGW 3 determines that the ONU 2A connected to the own device is an ONU 2 capable of converting the first frame into the second frame.
Note that whether or not the management control unit 34 can support frame conversion processing regarding the ONU 2A may be determined not only based on both the product ID and the vendor, but also based on information on only one of them.

[Modified example of internal configuration of HGW]
FIG. 7 is a block diagram showing another example of the internal configuration of the OLT 1, the pluggable ONU 2A, and the HGW 3. In the optical communication system of FIG. 7, the internal configuration of the OLT 1 and ONU 2A is the same as that of FIG. 2, but the internal configuration of the HGW 3 is different from that of FIG.
Specifically, the management control unit (CPU) 34 of the HGW 3 can cut off the power after a predetermined period of time has elapsed since the power switch 39 was turned off, and the power supply unit of the HGW 3 can cut off the power by turning off the power switch 39 and the power supply unit. It does not have a disconnection sensor 37.

The power converter 35 steps down the DC voltage input from the AC adapter 38 and outputs it. The output side of the power conversion unit 35 is connected to each unit 31 to 34 in the HGW 3 and the power terminal of the slot-in type physical port P1.
Therefore, the power conversion unit 35 applies an output voltage to each unit 31 to 34 in its own device, and also applies an output voltage to a predetermined terminal included in the terminal module 24 of the pluggable ONU 2A connected to the physical port P1. do.

As shown in FIG. 7, the power switch 39 is connected to the management control section 34 and the power conversion section 35, respectively. The power switch 39 outputs an on signal S1 based on an on operation to the power conversion unit 35, and outputs an off signal S2 based on an off operation to the management control unit 34.
The power converter 35 is activated by the ON signal S1, and stops operating by the stop signal S3 from the power converter 35. When the off signal S2 is input, the management control unit 34 performs a predetermined termination process and then outputs a stop signal S3 to the power conversion unit 35.

As part of the above termination process, the management control unit 34 generates a control frame for notifying the power off of the own device based on the off operation of the power switch 39, and transmits the generated control frame to the It is transmitted to the ONU 2A and the user terminal 5.
In this way, in the HGW 3 of FIG. 7, the event that causes power outage that can be detected by the management control unit 34 is limited to the OFF operation of the power switch 39.

Therefore, in the case of the optical communication system shown in FIG. 7 that employs the above HGW 3, in the power outage notification method 1 shown in FIG. 4, "detect power outage" in step S21 is changed to "detect power off operation" You can read it as .
Similarly, in the case of the optical communication system shown in FIG. 7 that employs the HGW 3 described above, in the power-off notification method 2 shown in FIG. ”.

In the optical communication system shown in FIG. 7, when the operation is to continue for a predetermined period of time after removal of the AC adapter, removal of the outlet, or power cut due to a power outage, etc., the off-delay circuit 36 and power-off sensor 37 shown in FIG. 2 are connected to the HGW 3. You can decide to set it up.
In this case, the management control unit 34 detects the above-mentioned power interruption other than the OFF operation of the power switch 39 using the power interruption sensor 37, and detects the OFF operation of the power switch 39 using the OFF signal S2 from the power switch 39.

[Other variations]
The embodiments described above are illustrative in all respects and are not restrictive. The scope of rights of the present invention includes all changes within the scope of equivalents to the configurations described in the claims.
For example, in the above-described embodiment, the communication device to which the ONU 2A can be connected is the HGW 3, but the communication device is a communication device that has at least one physical port for the ONU 2A, such as a management switch or a general-purpose server. Good to have.

In the embodiment described above, if the communication device to which the ONU 2A can be connected is a communication device such as a general-purpose server to which the user terminal 5 is not connected, the physical port P2 for the user terminal 5 is unnecessary.

1 OLT (station side device)
2 ONU (home device)
2A pluggable ONU (home device)
2B Stationary ONU (home device)
3 HGW (communication device)
4 PON line 5 User terminal 6 Optical splitter 7 Trunk fiber 8 Branch fiber 11 Optical transceiver (TRx)
12 PON processing unit 13 L2 switch 14 management control unit 15 management terminal 21 optical transceiver (TRx)
22 PON processing section 23 PHY processing section 24 terminal module 31 Upper side transmission/reception section (relay processing section)
32 Frame processing unit (relay processing unit)
33 Lower side transmission/reception unit (relay processing unit)
34 Management control section 35 DC/DC converter (power supply section)
36 Off-delay circuit (power supply section)
37 Power cutoff sensor (power supply section)
38 AC adapter 39 Power switch 40 Management table 41 Judgment table P1 Physical port P2 Physical port

Claims (5)

A pluggable home-side device that configures a PON system together with a station-side device,
optical transceiver,
a PON processing unit connected to the optical transceiver;
a PHY processing unit connected to the PON processing unit;
A terminal module connected to the PHY processing unit, the terminal module being supplied with power from the power supply unit of the communication device when connected to a physical port of the communication device,
The PON processing unit includes:
Converting the following first frame input from the PHY processing unit into the following second frame, outputting the converted second frame to the optical transceiver,
The first and second frames are
is an extended OAM frame,
The frame conversion process executed by the PON processing unit is as follows:
The home-side device performs a process of rewriting the source address of the first frame to its own address information .
1st frame: Control frame for notifying power-off of communication device 2nd frame: Control frame for notifying power-off of home-side device A communication device that communicates with a pluggable home device that constitutes a PON system together with a station device,
one or more physical ports to which the home device can be connected;
a management control unit that manages the connected home device;
a relay processing unit that relays communication frames transmitted and received by the home-side device and the management control unit;
comprising a power supply unit that supplies power to each part in the own device and the home device, and is capable of continuing power supply for a predetermined time after the power is turned off;
The management control unit includes:
When a power off of the own device is detected, a control frame for notifying the power off of the own device is generated, and the generated control frame is used to generate a control frame for notifying the power off of the home device. A communication device that transmits only to the home device that can convert it into a control frame . A communication device that communicates with a pluggable home device that constitutes a PON system together with a station device,
one or more physical ports to which the home device can be connected;
a management control unit that manages the connected home device;
a relay processing unit that relays communication frames transmitted and received by the home-side device and the management control unit;
A power supply unit that supplies power to each part in the own device and the home device,
The management control unit includes:
When an off operation of the power switch of the own device is detected, a control frame is generated to notify the power off of the own device , and the generated control frame is used to notify the power off of the home device. A communication device that transmits only to the home device that can convert the control frame to a control frame for A station-side device,
a pluggable home-side device connected to the station-side device via a PON line;
A PON system comprising: a communication device having one or more physical ports to which the home device can be connected;
When the communication device that supplies power to the home-side device detects a power-off of its own device or an off operation of a power switch, it generates the following first frame and transmits it to the home-side device,
The home-side device that has received the first frame from the communication device converts the received first frame into a second frame described below, and transmits the converted second frame to the station-side device ,
The first and second frames are
is an extended OAM frame,
The frame conversion process executed by the home device is as follows:
A PON system that is a process of rewriting the source address of the first frame to the address information of the own device .
1st frame: Control frame for notifying power-off of communication device 2nd frame: Control frame for notifying power-off of home-side device A station-side device,
a pluggable home-side device connected to the station-side device via a PON line;
A power-off notification method in a PON system comprising: a communication device having one or more physical ports to which the home device can be connected;
When the communication device that supplies power to the home device detects a power-off or a power switch off operation of its own device, generating the following first frame and transmitting it to the home device;
the home-side device receiving the first frame from the communication device converting the received first frame into a second frame described below, and transmitting the converted second frame to the station-side device; including;
The first and second frames are
is an extended OAM frame,
The frame conversion process executed by the home device is as follows:
A power-off notification method is a process of rewriting the source address of the first frame to address information of the device itself .
1st frame: Control frame for notifying power-off of communication device 2nd frame: Control frame for notifying power-off of home-side device

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