JP2014207593A - Remote power restart device for optical line device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restart only a defective ONU from a remote place.SOLUTION: A first light-to-power converter unit 20 converts control light from the OLT 2 side into electric power. A power line control unit 23 operates an internal timer by a current that flows according to the power, and resets the timer by communication light from an ONU 3. If the current continues flowing in up to the threshold time of the timer, a power line switch 22 inserted into the power line of the ONU 3 is switched on and then switched off.

Description

  The present invention relates to a technique for controlling an ONU (Optical Network Unit).

  In order to maintain and monitor the ONU in the user's house, in Patent Document 1, an ONU LED lighting signal is wirelessly transmitted to the monitoring device, and the ONU operation status and failure status are remotely grasped based on the lighting status. Yes.

JP 2011-130181 A JP-A-9-130340

  However, if the ONU freezes due to a lightning strike, etc., the ONU does not have means for autonomously avoiding the frozen state. It was necessary to request or send maintenance personnel to the user's house.

  In this regard, it is conceivable to use the technique of Patent Document 2. However, in order to turn the power off and on by remote operation when the ONU is in a frozen state, a separate communication device is required. In addition, it is difficult to distinguish all ONUs accommodated in a splitter in a PON (Passive Optical Network) section, and all of them are restarted by a simple communication method, which affects normal ONUs. Furthermore, in order to distinguish all ONUs, communication devices corresponding to the OLT and the ONU are separately prepared for remote operation communication, which is expensive. Further, in this case, there is a possibility that both the ONU and the remote communication device will freeze due to lightning or the like.

  The present invention has been made in view of the above-described problems. The first object is to restart an ONU remotely, and the second object is to restart only a defective ONU. .

  The remote power supply restarting device for an optical line device according to claim 1, wherein a photoelectric conversion unit for converting control light from the station side into electricity, and a timer is operated by the input of the electric component, and the input is continued until a predetermined time. And a power supply control unit that turns off and on the power supply of the optical line device.

  According to the present invention, the control light from the station side is converted into electricity, the timer is operated by the input of the electrical component, and the power of the optical line device is turned on and turned on when the input is continued until a certain time, The ONU (optical line device) can be remotely restarted.

  The remote power supply restarting device for an optical line device according to claim 2 is the remote power supply restarting device for the optical line device according to claim 1, wherein the power supply control unit is configured to transmit the communication power from the optical line device. The gist is to reset the timer.

  According to the present invention, since the timer is reset by communication light from the optical line device, only a defective ONU can be restarted.

  The remote power supply restart device for an optical line device according to claim 3 is a remote power supply restart device for an optical line device according to claim 1 or 2, wherein the remote power supply restart device is a separate housing from the optical line device, The gist of the present invention is that it is inserted later between a power supply voltage input line and a predetermined power supply voltage supply line of the line device.

  According to the present invention, an ONU can be remotely restarted, and only a defective ONU can be restarted.

It is a block diagram of a remote power supply restarting apparatus. It is a whole operation | movement sequence diagram of ONU restart. It is the 1st reference figure at the time of whole operation explanation. It is a 2nd reference figure at the time of whole operation | movement description. It is the 3rd reference figure at the time of whole operation explanation. It is a circuit diagram of a power line control part.

  Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings. However, the present invention can be implemented in many different modes and should not be construed as being limited to the description of the present embodiment.

  First, the configuration of the remote power supply restart device 1 will be described with reference to FIG. The remote power supply restarting apparatus 1 has a first optical communication port 11 for connecting the optical fiber 5a on the telephone office side (installation side of the OLT 2) and an optical fiber 5b of the ONU 3 as an external interface. 2 optical communication ports 12, a power supply port 13 for connecting the power supply voltage input line 6 of the ONU 3, and a power supply cable 14 for connecting to the power supply voltage supply line 4 in the household outlet.

  And, it is used for testing whether or not the downlink communication light (and the control light (ONU 3 is frozen) transmitted from the OLT 2 through the first optical communication port 11, And a second asymmetric coupler 16 for distributing upstream communication light transmitted from the ONU 3 via the second optical communication port 12. .

  The first asymmetric coupler 15 and the second asymmetric coupler 16 are directly connected by the optical fiber 17, and the OLT 2 and the ONU 3 are aware of the remote power supply restarting device 1 inserted in the PON section. Can communicate with each other.

  Further, the power supply port 13 and the power supply cable 14 are directly connected by a power supply line 18. The ONU 3 connects the power supply voltage input line 6 of its own device to the power supply port 13 of the remote power supply restarting device 1, thereby The apparatus can be operated using the power supply voltage from the supply line 4.

  In such a remote power supply restarting apparatus 1, a wavelength selection filter 19 that transmits only the control light wavelength band from the distributed light (downlink communication light and control light) from the first asymmetric coupler 15, and The first light / power converter 20 that converts the transmitted control light into electric power and inputs it to the power line controller 23, and the distributed light (uplink communication light) from the second asymmetric coupler 16 is converted into electric power. The second light / power converter 21 that is input to the power line controller 23, the power line switch 22 inserted and connected on the power line 18, the first light / power converter 20, and the second light / power converter And a power line control unit 23 that controls the power line switch 22 based on each power from the power source 21.

  Specifically, the power line control unit 23 operates the internal timer when a current corresponding to the power flows from the first light / power conversion unit 20, and when the current line continues to flow for a certain time, the power line switch 22 It has a function to turn off and on. By providing this function, the ONU 3 is remotely restarted by continuous control light input from the telephone office side.

  The power line control unit 23 has a function of resetting the timer when a current corresponding to power flows from the second light / power conversion unit 21. With this function, if the ONU 3 is normal, the timer is reset by the upstream communication light, and the power line switch 22 is not turned off. Therefore, the defective ONU among the plurality of ONUs accommodated in the splitter 7 in the PON section Only have to restart.

  Next, the overall operation of ONU restart will be described with reference to FIGS. FIG. 2 is an operation sequence of the entire operation, and FIGS. 3 to 5 are reference diagrams for explaining the operation.

  First, when a communication abnormality is detected in the OLT 2 due to non-arrival of upstream communication light from the ONU 3 (step S1), the control light source 8 prepared in advance in the station is turned on by the administrator in the telephone station ( Step S2).

  This control light is sent to all the remote power supply restarting apparatuses 1 through the optical fiber 5a for communication light, and the first light / power converter 20 through the first asymmetric coupler 15 and the wavelength selection filter 19. Is received.

  Next, in each remote power supply restarting device 1, the control light is converted into electric power by the first light / power conversion unit 20, and the timer is triggered by the inflow of current by the electric power by the power line control unit 23. The operation is started (step S3).

  Next, before the threshold time of the timer elapses, the OLT 2 transmits a communication request to all the ONUs 3 (step S4). This communication request is made using downlink communication light and is directly transmitted to the ONU 3 via the optical fiber 17 in the remote power supply restarting apparatus 1. The input to the first optical / power conversion unit 20 is cut by the wavelength selection filter 19.

  Next, when the ONU 3 is normal, the normal ONU 3 sends a response by the upstream communication light in response to the communication request from the OLT 2 and is directly sent to the OLT 2 via the optical fiber 17 in the remote power supply restarting apparatus 1. It is transmitted (step S5).

  Simultaneously with step S5, the second light / power converter 21 converts the communication light into electric power, and the power line controller 23 resets the timer triggered by the inflow of current by the electric power (step S6). ).

  On the other hand, when the ONU 3 is frozen, no upstream communication light is transmitted from the abnormal ONU 3 ′, so the timer in the remote power supply restarting device 1 ′ attached to the ONU 3 ′ is not reset and continues to operate. .

  Next, when the threshold time of the timer is reached by continuous input of control light (step S7), the power line inserted on the power line of the abnormal ONU 3 ′ by the power line control unit 23 of the remote power supply restarting device 1 ′. The switch 22 is turned off and turned on. Thereby, the abnormal ONU 3 'is restarted (step S8).

  Since the control light source 8 is in the ON state, the timer operation of each remote power supply restarting device 1, 1 ′ is restarted after steps S6 to S8 due to the continuous inflow current due to the control light (step S9). ).

  Next, similarly to step S4, before the threshold time of each timer elapses, the OLT 2 transmits a communication request to all ONUs 3 again (step S10).

  Here, since the abnormal ONU 3 'has been normalized by step S8, the upstream communication light for responding to the communication request is transmitted by all the ONUs 3 (step S11), and all the remote power supply restarting devices are transmitted. 1, each timer is reset by an inflow current based on each upstream communication light (step S <b> 12).

  Thereafter, it is determined by the OLT 2 whether or not responses have been received from all the accommodated ONUs 3 (step S13). If received, the control light source 8 is turned off by the administrator in the telephone office (step S13). S14).

  Since the control light is not emitted, each timer of all the remote power supply restarting devices 1 is reset, and the operation ends. If there is an unanswered ONU 3, the process returns to step S4, and a communication request is repeatedly transmitted until responses are received from all the ONUs 3.

  Next, an implementation example of the remote power supply restarting apparatus 1 having the functional operations described so far will be described.

  The first light / power conversion unit 20 and the second light / power conversion unit 21 can be realized by using a photoelectric conversion element that converts light energy into power energy, such as that used in solar cells.

  Further, the power line control unit 23 can be realized by a circuit as shown in FIG. 6 using, for example, a capacitor, a transistor, a diode, an IC circuit, and a logic circuit combining them. This will be described below.

  Specifically, the charger 23a operating as a timer is connected to the first light / power converter 20 via the charging line 23b, and connected to the ground and the power line switch 22 via the halfway branching discharge line 23c. ing.

  Also, a first switch element 23d having an operation trigger terminal connected to the second light / power converter 21 is inserted on the line to the ground, and the voltage at the charger 23a is inserted on the line to the power line switch 22. Is inserted as a trigger.

  When the control light is emitted in the telephone station, a current flows from the first light / power converter 20 via the charging line 23b, and the charger 23a is charged. Although the voltage value of the charger 23a gradually increases according to the emission time of the control light, the first switch element 23d becomes conductive by the inflow current according to the upstream communication light from the normal ONU 3, and is stored in the charger 23a. The generated power is discharged to ground.

  On the other hand, when the upstream communication light is not emitted and the voltage of the charger 23a reaches the threshold value, the second switch element 23e is turned on to operate the power line switch 22, and the power supply of the ONU 3 is turned off. When the power of the charger 23a is sufficiently used, the second switch element 23e is disconnected again, and the ONU 3 is turned on.

  Note that the circuit configuration illustrated in FIG. 6 is an example, and may be configured with a logic circuit by photovoltaic power generation, for example. Further, each functional unit other than these can be realized by using existing technology. For example, the power line switch 22 can be realized using a magnetic relay switch or a transistor. The wavelength selection filter 19 can be realized using a WDM coupler.

  As described above, according to the present embodiment, when the control light from the central office is converted into electric power, the timer is operated by inflow of current according to the electric power, and the inflow continues until the threshold time of the timer. Since the ONU 3 is turned off and on, the ONU 3 can be remotely restarted.

  Further, according to the present embodiment, since the timer is reset by the communication light from the ONU 3, only the defective ONU 3 in the PON section can be restarted.

  In addition, according to the present embodiment, the remote power supply restarting device 1 is configured by passive elements, analog circuits, and the like, so a power source for operating the device 1 is unnecessary and the failure rate can be reduced. it can.

  Further, according to the present embodiment, since the remote power supply restarting apparatus 1 is configured in a separate housing from the ONU 3, functions can be added later to the ONU 3. Since the existing ONU 3 can be used as it is, it is possible to provide the remote power supply restarting apparatus 1 that is low in cost and friendly to the environment.

  Finally, in the present embodiment, an example in which the control light source 8 is newly provided has been described. However, test light that is normally used by the OLT 2 in order to test communication with the ONU 3 may be used as control light. In that case, the new control light source 8 can be made unnecessary.

  In addition, the embodiment using the asymmetric coupler as the communication light and control light distribution device has been described. However, if the loss of the communication light can be tolerated to some extent, another device such as a symmetric coupler that operates with less light can be used. You may use.

1 ... Remote power supply restarting device 2 ... OLT (Optical Line Terminal)
3 ... ONU (Optical Network Unit)
DESCRIPTION OF SYMBOLS 4 ... Power supply voltage supply line 5a ... Optical fiber on the telephone office side 5b ... Optical fiber on the ONU side 6 ... Power supply voltage input line of ONU 7 ... Splitter 8 ... Control light source 11 ... First optical communication port 12 ... Second light Communication port 13 ... Power supply port 14 ... Power supply cable 15 ... First asymmetric coupler 16 ... Second asymmetric coupler 17 ... Optical fiber in remote power supply restart device 18 ... Power supply line 19 ... Wavelength selective filter 20 ... First light・ Power converter (photoelectric converter)
21 ... Second light / power converter (photoelectric converter)
DESCRIPTION OF SYMBOLS 22 ... Power line switch 23 ... Power line control part 23a ... Charger 23b ... Charging line 23c ... Discharge line 23d ... 1st switch element 23e ... 2nd switch element S1-S14 ... Step

Claims (3)

A photoelectric conversion unit that converts control light from the station side into electricity;
A power supply control unit that operates the timer by inputting the electrical component and turns off the power of the optical line device when the input is continued until a predetermined time; and
A remote power supply restarting device for an optical line device. The power control unit
2. The remote power supply restarting device for an optical line device according to claim 1, wherein the timer is reset by communication light from the optical line device.   3. The optical line device according to claim 1, wherein the optical line device is a separate housing and is inserted later between a power supply voltage input line and a predetermined power supply voltage supply line of the optical line device. Remote power supply restarter for optical line equipment.

Images