JP2016032131A - Optical line termination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smaller optical line termination device.SOLUTION: An optical line termination device comprises: a power supply unit for receiving power from a node device via a power line; a detection unit that detects disconnection of power by obtaining the voltage value of power from the node device via a supply line, and outputs a control signal indicating that the power is disconnected; and a communication processing unit for transmitting power disconnection notification information indicating that the power is disconnected upon obtaining the control signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical line termination device.

  Conventionally, a desktop optical line termination unit (ONU) is known to have a DyingGasp process so that the center side can be notified of a case where power supply is cut off from a case where a failure or the like occurs. (Patent Document 1).

FIG. 5 is a diagram showing a conventional desktop type optical line termination device 900. The conventional optical line terminator 900 includes a diode 911, a capacitor 912, a DC / DC converter 913, a detection unit 914, a serial / parallel conversion unit 915, a communication processing unit 916, and an optical transceiver 917.
The optical line terminator 900 is supplied with direct current power converted from AC 100 V to DC 5 V by the power conversion adapter 902. The DC 5V power supplied from the power conversion adapter 902 is input to the DC / DC converter 913 via the diode 911. The capacitor 912 stores a charge having a magnitude proportional to the capacitance C.

  The DC / DC converter 913 converts a DC 5V power source into DC 3.3V. The power of DC 3.3V is supplied to each circuit or chip in the optical line termination device 900 and consumed. When the power supplied from the power conversion adapter 902 is cut off, the optical line termination device 900 detects the power off by the detection unit 914. Then, the electric charge accumulated in the capacitor 912 is released and supplied to each circuit, chip, etc. in the optical line terminator 900. At this time, the electric charge accumulated in the capacitor 912 is consumed in the optical line termination device 900 without flowing out to the outside by the diode 911. As a result, the optical line termination device 900 can be operated only for a predetermined period. That is, a DyingGasp signal indicating that the power supply is cut off at the predetermined time is output to the OLT 901 via the communication processing unit 916 and the optical transceiver 917.

JP 2008-244583 A

  However, in the above optical line termination device, a large capacitance capacitor 912 is required to realize the DyingGasp process. The capacitor 912 is a component having a relatively large size. The SFP (Small Form Factor Pluggable) type optical line terminator that can be plugged into and removed from the port of the optical node device is sized according to the MSA standard. Therefore, it is difficult to secure a space for placing the capacitor 912 having a large electrostatic capacity in the SFP type optical line termination device.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a more compact optical line terminating device.

  In one embodiment of the present invention, a power supply unit that receives power from a node device via a power supply line, and a power supply voltage value obtained from the node device via the supply line is detected to detect that the power supply is cut off. And a detection unit that outputs a control signal indicating that the power source has been disconnected, and a communication processing unit that transmits power-off notification information indicating that the power source has been disconnected when the control signal is acquired. It is an optical line termination device provided.

  Another aspect of the present invention is the above-described optical line termination device, wherein the node device includes a power conversion adapter that converts an external AC power source into a first DC voltage power source, and the first DC voltage. Is converted into a second DC voltage, a supply line connected to the power converter, a diode having an anode connected to the power converter, one end connected to the cathode of the diode, and the other A power supply line having a grounded end, and the communication processing unit, when the voltage value of the power supplied from the supply line is less than or equal to a predetermined threshold, It is transmitted to the optical line termination device on the center side.

  One embodiment of the present invention is the above-described optical line termination device, wherein the capacitor has a capacitance greater than or equal to a predetermined size, and at least the communication processing unit acquires a control signal from the detection unit. The power is supplied from the capacitor until the power-off notification information is transmitted to the optical line terminal on the center side.

  As described above, according to the present invention, it is possible to provide a more compact optical line termination device.

It is a block diagram which shows the structure of the PON system using the optical line termination | terminus apparatus of 1st Embodiment. It is a figure which shows the block diagram of 30 A of node apparatuses and ONU20A of 1st Embodiment. It is a figure which shows the block diagram of 30 A of node apparatuses and ONU20A of 1st Embodiment. It is a figure which shows the modification of 1st Embodiment. It is a figure which shows the structure of the PON system using the conventional optical network unit.

  Hereinafter, a PON system using an optical line termination device according to an embodiment will be described with reference to the drawings.

(First embodiment)
Hereinafter, the optical line termination apparatus in the first embodiment will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of a passive optical network (PON) system 1 (hereinafter referred to as “PON system”) using the optical line termination device of the first embodiment.
As shown in FIG. 1, a PON system 1 includes an optical line terminator (OLT: Optical Line Termination) 10 on the accommodation station side (center side), a plurality of ONUs (Optical Network Units: subscribers). Home-side optical line termination device) 20 (ONUs 20A to 20C), a plurality of node devices 30 (node devices 30A to 30C), and an optical splitter 40 are provided. In the present embodiment, a case where there are three ONUs and node devices will be described, but the number is not limited to this number.

The OLT 10 is connected to a host device (not shown) of the provider service network. The OLT 10 is connected to the optical splitter 40 via an optical fiber.
The optical splitter 40 branches the optical fiber 50 from the OLT 10 into a plurality of optical fibers 60A to 60C. The optical fibers 60A to 60C are connected to the ONUs 20A to 20C, respectively.

  The ONUs 20A to 20C are connected to the node devices 30A to 30C, respectively. The ONU 20 is a module-type optical line termination device that can be hot-plugged into and removed from the node device 30. The module type that can be hot-plugged is specified by the MSA standard, for example, SFP (Small Form-factor Pluggable) type. The ONU 20 is supplied with power from the node device 30 by being inserted into the node device 30.

  The node device 30 has an MSA port 300 into which the ONU 20 is inserted. The MSA port 300 is a port compliant with the MSA (Multi Source Agreement) standard, for example, an SFP port. In addition to the MSA port 300, the node device 30 has a plurality of ports. The node device 30 is connected to a terminal device (not shown) via the plurality of ports. The terminal device is a communicable device, such as a personal computer, a smart phone, a mobile phone, a television receiver, or a game device.

FIG. 2 is a block diagram of the node device 30A and the ONU 20A. Note that the node devices 30B and 30C have the same configuration as the configuration example of the node device A shown in FIG. Further, the ONU 20B and ONU 20C have the same configuration as that of the ONU 20A shown in FIG.
The node device 30A includes a power conversion unit 31, a diode 32, a capacitor 33, and a communication processing unit 34.

The power conversion unit 31 receives power from an external power source. The external power source is, for example, a power conversion adapter or a commercial power source. In the present embodiment, a case where the external power source is a power conversion adapter will be described. The power conversion adapter 70 receives AC 100V power. The power conversion adapter 70 converts the received AC 100V into, for example, a DC 5V voltage (first DC voltage). The power conversion adapter 70 outputs the converted voltage to the power conversion unit 31.
The power conversion unit 31 converts the power received from the power conversion adapter 70 into a use voltage (second DC voltage) of the own device. The power converter 31 is connected to the connection terminal 36 via the supply line after the converted voltage.

The diode 32 is connected in series with the power supply line. The diode 32 has an anode connected to the power conversion unit 31. The diode 32 has a cathode connected to the connection terminal 37.
The capacitor 33 has a capacitance C. One end of the capacitor 33 is connected to the power line. Specifically, the capacitor 33 is connected between the diode 32 and the connection terminal 37. The other end of the capacitor 33 is connected to the ground potential. As described above, since the diode 32 and the capacitor 33 are connected to the power supply line, when power is supplied from the power conversion adapter 70, the capacitor 33 stores a charge having a magnitude proportional to the capacitance C. . Further, when power is not supplied from the power conversion adapter 70, the charge accumulated in the capacitor 33 is released. The discharged charges do not flow to the power conversion unit 31 side because the diode 32 is provided. That is, all the electric charges discharged from the capacitor 33 are supplied into the power supply unit 27 via the connection terminal 37. As a result, even if the power supply from the power conversion adapter 70 is stopped, the ONU 20A can operate only for a predetermined period (hereinafter referred to as “charge supply time”).

  The communication processing unit 34 is connected to the connection terminal 35. The communication processing unit 34 receives data from the OLT 10 via the connection terminal 35. The communication processing unit 34 controls each unit in the own device based on the received data.

The ONU 20A includes an MSA connector 21, an optical transceiver unit 22, a communication processing unit 23, a serial / parallel conversion unit 24, a storage unit 25, a power monitoring unit 26, and a power supply unit 27.
The MSA connector 21 includes a plurality of connection terminals 211 to 214. The connection terminals 211 to 214 are, for example, copper thin film patterns formed at predetermined intervals on a circuit board. The MSA connector 21 is electrically connected to both terminals in a state where the MSA connector 21 is completely inserted into the MSA port 300 provided in the node device 30A (mounted state). That is, when the MSA connector 21 is inserted into the MSA port 300, the connection terminals 211 to 214 engage with the connection terminals 35 to 38, respectively.
The optical transceiver unit 22 is connected to the OLT 10. The optical transceiver unit 22 includes an Rx unit and a Tx unit. The Rx unit converts the optical signal supplied from the OLT 10 into an electrical signal. Then, the Rx unit outputs the converted electrical signal to the communication processing unit 23. The Tx unit receives an electrical signal from the communication processing unit 23. The Tx unit converts the received electrical signal into an optical signal. The Tx unit outputs the converted electric signal to the OLT 10.

  The communication processing unit 23 performs termination processing for data signals transmitted between the OLT 10 and the node device 30A. Further, the communication processing unit 23 receives a control signal from the power monitoring unit 26. When receiving the control signal, the communication processing unit 23 acquires power-off notification information from the storage unit 25. The communication processing unit 23 outputs this power-off notification information to Tx of the optical transceiver unit 22. The power-off notification information is information indicating that the power has been cut off, and is, for example, DyingGasp. For example, the communication processing unit 23 is a semiconductor chip, an arithmetic processing unit (CPU), and a logic circuit.

  The serial / parallel converter 24 converts a serial signal and a parallel signal into each other. The serial / parallel converter 24 converts the parallel signal from the communication processor 23 into a serial signal and outputs the serial signal to the communication processor 34. The serial / parallel converter 24 converts the serial signal from the communication processor 34 into a parallel signal and outputs the parallel signal to the communication processor 23.

The power monitoring unit 26 is connected to the connection terminal 212. When the MSA connector 21 is inserted into the MSA port 300, power is supplied to the power monitoring unit 26 via the supply line of the node device 30A. The power monitoring unit 26 detects that the power supplied from the node device 30A has been cut off. For example, the power monitoring unit 26 determines that the power supply has been disconnected when the voltage value of the power supply supplied from the node device 30A is equal to or less than a predetermined threshold value. When the power monitoring unit 26 detects power-off, the power monitoring unit 26 outputs a control signal indicating that the power has been cut off to the communication processing unit 23.
The power supply unit 27 is connected to the connection terminal 213. When the MSA connector 21 is inserted into the MSA port 300, power is supplied to the power supply unit 27 via the power line of the node device 30A. The power supply unit 27 supplies power to each unit of the ONU 20A.

  Next, the operation of the optical line termination device 20A of the present embodiment will be described based on a flowchart. FIG. 3 is a flowchart showing the operation of the optical network unit 20A in the present embodiment.

  In step S101, the ONU 20A is inserted into the MSA port 300 of the node device 30A. When the power conversion adapter 70 is connected to an AC 100V power source, a voltage is supplied to the power conversion unit 31. The power conversion unit 31 converts the supplied voltage into a predetermined voltage. The predetermined voltage is a voltage used in its own device, for example, 3.3V. The power monitoring unit 26 acquires a voltage from the power conversion unit 31 via the supply line. In addition, the power supply unit 27 acquires a voltage from the power conversion unit 31 via the power line. The power supply unit 27 supplies power to each unit of the node device 30A.

  In step S102, the power monitoring unit 26 determines whether the power supplied from the node device 30A has been cut off. For example, the power monitoring unit 26 determines whether the voltage value of the power supplied from the node device 30A is equal to or less than a predetermined threshold value. When the voltage value of the power supplied from the node device 30A is equal to or lower than the predetermined threshold (step S102: YES), the power monitoring unit 26 proceeds to step S103. On the other hand, when the voltage value of the power supplied from the node device 30A exceeds a predetermined threshold (step S102: NO), the power monitoring unit 26 acquires the voltage again from the power conversion unit 31 via the supply line. In the present embodiment, the case where the power supplied from the node device 30 </ b> A is cut off is a case where the power is not supplied from the power conversion adapter 70.

In step S <b> 103, the power monitoring unit 26 outputs a control signal to the communication processing unit 23.
In step S104, when power is not supplied from the power conversion adapter 70, the charge accumulated in the capacitor 33 is released. Since the diode 32 is provided, the discharged electric charge does not flow outside and does not flow to the power conversion unit 31 side. In other words, the power supply unit 27 is supplied with the charge discharged from the capacitor 33 through the power line. Then, the power supply unit 27 supplies the charge to each unit of the node device 30A.

  In step S105, the communication processing unit 23 notifies the OLT 10 that the power has been cut off while the charge of the capacitor 33 is being supplied from the power supply unit 27. That is, the communication processing unit 23 receives a control signal from the power monitoring unit 26. When receiving the control signal, the communication processing unit 23 acquires power-off notification information from the storage unit 25. The communication processing unit 23 outputs the power-off notification information to the Tx unit of the optical transceiver unit 22. The Tx unit converts the power-off notification information into an optical signal. The Tx unit outputs the power-off notification information converted into the optical signal to the OLT 10 via the optical fiber.

  As described above, the capacitor 33 that supplies electric charge to each part of the optical line termination device 20 when the power is turned off is arranged in the node device 30, so that the space for arranging the capacitor 33 in the optical line termination device 20 of this embodiment is reduced. Reduction is possible. Thereby, the optical line termination device 20 can be further downsized. Further, the optical line termination device 20 of the present embodiment receives power from two systems of the supply line and the power line of the node device 30. The power monitoring unit 26 monitors the power supply of the supply line and detects the disconnection of the power supply. Then, the power monitoring unit 26 outputs a control signal to the communication processing unit 23 when it detects that the power supply is cut off. The power supply unit 27 supplies power from the power line to each part of the optical line termination device 20. When the power is cut off, the power supply unit 27 receives charges from the capacitor 33 in the node device 30 and transmits the received charges to each unit of the optical line termination device 20. As a result, when the power supply from the power conversion unit 31 of the node device 30 is cut off, the communication processing unit 23 notifies the OLT 10 that the power supply has been cut off by the charge of the capacitor 33 being supplied. Can do.

  The above-described embodiments are all illustrative of the embodiments of the present invention and are not limited to the embodiments, and the present invention can be implemented in various other modifications and changes.

  FIG. 4 is a first modification of the present embodiment. As shown in FIG. 4, a control unit 81 and a switch 80 are provided in the node device 30A. The switch 80 has one end connected to the supply line and the other end connected to the ground potential. The control unit 81 is connected to the switch 80. The control unit 81 outputs a control signal to the switch 80 when the power supply from the power conversion unit 31 is cut off. When the switch 80 receives the control signal, one end and the other end are electrically connected. That is, the control unit 81 outputs a control signal to the switch 80 to turn on the switch 80. As described above, when the power supply from the power conversion unit 31 is cut off, the control unit 81 turns on the switch 80 and drops the potential of the supply line to the ground potential.

  When the power supply from the power conversion unit 31 is cut off, the voltage of the supply line is gradually attenuated due to the impedance of the supply line, the parasitic capacitance, and the like. For this reason, the power monitoring unit 26 cannot immediately detect the disconnection of the power supply when the power supply is disconnected. Therefore, the electric charge accumulated in the capacitor 33 is consumed from the time when the power supply is cut to the time when the power monitoring unit 26 detects the cut of the power supply. However, as described above, when the power supply is cut off, the switch 80 is used to drop the potential of the supply line to the ground potential, so that more charge stored in the capacitor 33 is notified of the power-off notification. Can be used as a power source.

  Further, in the above-described embodiment, the voltage from the supply line is used for detecting the power interruption, but the present invention is not limited to this. For example, the voltage from the supply line may be supplied to each part of the optical line termination device 20 as a power source.

1 PON system 10 OLT
20 ONU
30 Node device 40 Optical splitter 50, 60 Optical fiber 21 MSA connector 22 Optical transceiver unit 23 Communication processing unit 24 Serial / parallel conversion unit 25 Storage unit 26 Power monitoring unit 27 Power supply unit 31 Power conversion unit 32 Diode 33 Capacitor 34 Communication processing Part 80 switch 81 control part

In one embodiment of the present invention, a power supply unit that receives power from a node device via a power supply line, and a power supply voltage value obtained from the node device via the supply line is detected to detect that the power supply is cut off. And a detection unit that outputs a control signal indicating that the power supply is cut off by supplying power stored in a capacitor provided in the node device as a drive power supply after the power supply is cut off, and And a communication processing unit that transmits power-off notification information indicating that the power has been cut off when a control signal is acquired.

Another aspect of the present invention is the above-described optical line termination device, wherein the node device includes a power conversion adapter that converts an external AC power source into a first DC voltage power source, and the first DC voltage. Is converted into a second DC voltage, a supply line connected to the power converter, a diode having an anode connected to the power converter, one end connected to the cathode of the diode, and the other It has a power supply line having a said capacitor having its one end grounded, and the, the communication processing unit, when the voltage value of power supplied from the supply line is below a predetermined threshold, the power-off notification information Is transmitted to the optical line terminator on the center side.

It is a block diagram which shows the structure of the PON system using the optical line termination | terminus apparatus of 1st Embodiment. It is a figure which shows the block diagram of 30 A of node apparatuses and ONU20A of 1st Embodiment. It is a figure which shows operation | movement of ONU20A in 1st Embodiment . It is a figure which shows the modification of 1st Embodiment. It is a figure which shows the structure of the PON system using the conventional optical network unit.

Next, the operation of the ONU 20A of this embodiment will be described based on a flowchart. FIG. 3 is a flowchart showing the operation of the ONU 20A in the present embodiment.

As described above, by disposing the capacitor 33 that supplies electric charge to each part of the ONU 20 when the power is turned off in the node device 30, it is possible to reduce the space for disposing the capacitor 33 in the ONU 20 of the present embodiment. Thereby, the ONU 20 can be further downsized. Further, the ONU 20 of the present embodiment receives power from two systems of the supply line and the power line of the node device 30. The power monitoring unit 26 monitors the power supply of the supply line and detects the disconnection of the power supply. Then, the power monitoring unit 26 outputs a control signal to the communication processing unit 23 when it detects that the power supply is cut off. The power supply unit 27 supplies power from the power line to each unit of the ONU 20. When the power supply is cut off, the power supply unit 27 receives charges from the capacitor 33 in the node device 30 and transmits the received charges to each part of the ONU 20. As a result, when the power supply from the power conversion unit 31 of the node device 30 is cut off, the communication processing unit 23 notifies the OLT 10 that the power supply has been cut off by the charge of the capacitor 33 being supplied. Can do.

Further, in the above-described embodiment, the voltage from the supply line is used for detecting the power interruption, but the present invention is not limited to this. For example, the voltage from the supply line may be supplied to each part of the ONU 20 as a power source.

One aspect of the present invention is a ONU that power is supplied through two lines of power supply lines and supply lines from the node device, driven from the node device of the ONU the power supply through the power supply line and a power supply unit for receiving a power supply, detects that the power supply by the power supply of the node device acquires the voltage value of the power supply via a supply line from the node device when it is disconnected is disconnected, the node After detecting that the power source of the device has been cut off, the power stored in the capacitor provided in the node device after the power source is cut off is received via the power line, and the power stored in the received capacitor a detection unit for outputting a control signal indicating that the power supply is disconnected by utilizing, power-off notification information indicating that the power supply in case of obtaining the control signal is disconnected , A communication processing unit for transmitting an optical line termination device comprising a.

Another aspect of the present invention is the above-described optical line termination device, wherein the node device includes a power conversion adapter that converts an external AC power source into a first DC voltage power source, and the first DC voltage. a power converter for converting the second DC voltage, said supply line connected to the power conversion unit, and a diode having an anode to the power conversion unit is connected, one end connected to the cathode of the diode, The power supply line having the capacitor grounded at the other end, and the communication processing unit, when the voltage value of the power supplied from the supply line is equal to or less than a predetermined threshold, the power-off notification Information is transmitted to the optical line terminating device on the center side.

Claims (3)

A power supply unit that receives power from the node device via a power line;
A detection unit that detects that the power supply is cut off by acquiring a voltage value of the power supply from the node device via a supply line, and outputs a control signal indicating that the power supply is cut off;
A communication processing unit for transmitting power-off notification information indicating that the power has been turned off when the control signal is acquired;
An optical line termination device comprising: The node device is
A power conversion adapter that converts an external AC power source to a first DC voltage source;
A power converter that converts the first DC voltage into a second DC voltage;
A supply line connected to the power converter;
A power line having a diode having an anode connected to the power converter, and a capacitor having one end connected to the cathode of the diode and the other end grounded;
Have
2. The optical line according to claim 1, wherein when the voltage value of the power supplied from the supply line is equal to or less than a predetermined threshold, the communication processing unit transmits the power-off notification information to a center-side optical line terminating device. Termination equipment. The capacitor has a capacitance greater than or equal to a predetermined size;
3. The light according to claim 2, wherein power is supplied from the capacitor until at least the communication processing unit acquires a control signal from the detection unit and transmits the power-off notification information to the optical line terminator on the center side. Line termination equipment.

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