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WO2010025668A1 - 一种光网络单元掉电处理的方法、装置及系统 - Google Patents

一种光网络单元掉电处理的方法、装置及系统 Download PDF

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Publication number
WO2010025668A1
WO2010025668A1 PCT/CN2009/073693 CN2009073693W WO2010025668A1 WO 2010025668 A1 WO2010025668 A1 WO 2010025668A1 CN 2009073693 W CN2009073693 W CN 2009073693W WO 2010025668 A1 WO2010025668 A1 WO 2010025668A1
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WIPO (PCT)
Prior art keywords
power
optical network
network unit
down maintenance
maintenance information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2009/073693
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English (en)
French (fr)
Inventor
杨素林
殷锦蓉
弗兰克·埃芬博格
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2010025668A1 publication Critical patent/WO2010025668A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0773—Network aspects, e.g. central monitoring of transmission parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/14—Monitoring arrangements

Definitions

  • the present invention relates to a network technology in the field of communications, and in particular to a method, device and system for power-down processing of an optical network unit. Background technique
  • the universal Passive Optical Network (PON) technology is a point-to-multipoint optical access technology.
  • the PON network is composed of an Optical Line Terminal (OLT), an Optical Distribution Network (ODN), and an Optical Network Unit (ONU).
  • OLT provides a network side interface for the ⁇ system and connects one or more ODNs.
  • the ODN is a passive optical distribution network for connecting.
  • the optical line terminal OLT and the optical network unit ONU or the optical network terminal ⁇ are used for distributing or multiplexing data signals between the OLT and the ONU or the UI; the ONU or the UI provides a user-side interface to the ODN.
  • the ONU or ⁇ is collectively referred to as the optical network unit ONU.
  • the OLT When the ODN is faulty or the ONU is powered off, the OLT will not receive the upstream optical signal from the corresponding ONU.
  • the PON standard stipulates that the OLT cannot receive the ONU in the time slot allocated to the ONU multiple times in succession. When the optical signal is generated, the OLT generates an ONU signal loss alarm message such as a LOSi alarm to indicate that the ONU is dropped. At the same time, the PON standard also stipulates that if the OLT receives an indication of the power failure of the ONU (for example
  • the OLT can ignore all subsequent alarms of the ONU. That is, although the ONU power failure or the ODN failure eventually has the same result (the OLT does not receive the upstream optical signal of the ONU), the ONU power failure condition is substantially different from the ODN failure. Therefore, when the ONU is powered off, the OLT does not perform the LOSi alarm. , only give the power failure notification, this can avoid the need to send engineers to repair when the ONU is powered off, thus reducing maintenance costs. However, at present, some ONUs do not support the power-down indication function.
  • the OLT When these ONUs lose power, the OLT will not receive the power-down indication, and the OLT will issue an ONU signal loss alarm, which will be misidentified as an ODN fault or cannot be determined. For power failure events, unnecessary maintenance costs are incurred.
  • some ONUs also have a power-down indication function, due to the processing capability of the OLT and the limitation of the ONU's own power-down maintenance capability (ONU uploading requires OLT authorization), when multiple ONUs are powered down at the same time, perhaps due to insufficient ONU capability or The OLT cannot perform authorization in time, causing the ONU's power-down indication to fail to be uploaded to the OLT in time, causing the OLT to misjudge the ODN failure, which in turn leads to unnecessary maintenance costs.
  • the OLT when the OLT cannot receive the optical signal of the ONU in the time slot allocated to the ONU multiple times, the OLT generates an alarm message such as an LOSi alarm to indicate that the ONU is offline.
  • the LOSi alarm may be caused by the ONU power failure, or it may be caused by the fiber failure of the ONU. If the ONU is powered off, you do not need to send a maintenance engineer for maintenance. If the optical fiber connected to the ONU is faulty, you need to send a maintenance engineer for maintenance.
  • the PON standard stipulates that the ONU needs to report its power-down event to the OLT through the Dying Gasp message when the power is turned off, so as to avoid dispatching engineers for maintenance when the ONU is powered off.
  • the inventors have found that the prior art has at least the following problems: When the ONU's power-down maintenance capability is unknown or the OLT processing capability is limited, the OLT cannot correctly determine whether the ONU is powered off or the ODN is faulty. The ONU performs timely and accurate power-down processing. Summary of the invention
  • the main purpose of the embodiments of the present invention is to provide a method, device, and system for power-down processing of an optical network unit, which are used to obtain ONU power-down maintenance information, and perform a drop event of the ONU according to the power-down maintenance information. Processing and diagnostics provide more accurate input for troubleshooting.
  • a method for power-down processing of an optical network unit includes: acquiring power-down maintenance information of an optical network unit, where the power-down maintenance information includes: a power-down maintenance time and/or a power-down maintenance parameter; When the network unit is offline, the power-down processing is performed on the optical network unit according to the power-down maintenance information of the optical network unit.
  • a method for obtaining an optical network unit power-down maintenance information includes: receiving a request for obtaining an optical network unit power-down maintenance information sent by an optical line terminal; and sending, according to the request, a sending optical network unit power-down maintaining information to The optical line termination, wherein the power down maintenance information comprises: a power down maintenance time and/or a power down maintenance parameter.
  • An optical line terminal includes: a first storage module and a power-down processing module; the first storage module is configured to store power-down maintenance information of the optical network unit, where the power-down maintenance information includes: a power-down maintenance time and The power-down processing module is configured to process the optical network unit according to the power-off maintenance time of the optical network unit when the optical network unit is disconnected.
  • An optical network unit includes: a second storage module and a power-down maintenance information reporting module; the second storage module is configured to store power-down maintenance information of the optical network unit; and the power-down maintenance information includes: And the power-down maintenance information reporting module is configured to receive the power-off maintenance information request of the optical network unit sent by the optical line terminal, and remove the optical network unit according to the request The electrical maintenance information is sent to the optical line terminal.
  • a passive optical network system comprising: an optical line terminal, an optical network unit, and an optical distribution network; the optical line terminal is configured to store power-down maintenance information of the optical network unit, when the optical network unit is disconnected, according to the optical network
  • the power-down maintenance time of the unit is processed by the optical network unit;
  • the power-down maintenance information includes: a power-down maintenance time and/or a power-down maintenance parameter;
  • the optical network unit is configured to provide power-down maintenance information of the optical network unit, and send the power-down maintenance information of the optical network unit to the optical line terminal.
  • the optical distribution network is configured to connect an optical line terminal and at least one optical network unit, and is configured to distribute or multiplex data signals between the optical line terminal and the at least one optical network unit.
  • the embodiment of the present invention obtains the power-down maintenance information of the optical network unit.
  • the power-down processing is performed on the optical network unit according to the power-down maintenance information of the optical network unit, which solves the prior art.
  • the optical network unit is powered off or the optical distribution network is faulty, the optical line terminal cannot correctly determine the power failure of the optical network unit, ensuring that the optical network unit completes the reporting of the power failure indication during the power failure maintenance time, and improves the reporting of the optical network unit.
  • the stability of the power-down indication provides a more accurate input for troubleshooting.
  • FIG. 1 is a structural diagram of a passive optical network system in the prior art
  • 2 is a flowchart of a method for power-down processing of an optical network unit according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for acquiring power-down maintenance information of an optical network unit according to an embodiment of the present invention
  • FIG. 4 is a flow chart of a method for reporting a power failure indication by an optical network unit according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an optical line terminal according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of an optical network unit according to an embodiment of the present invention
  • FIG. 7 is an optical network unit according to an embodiment of the present invention
  • Schematic diagram of the structure of the power-down maintenance time extension module
  • FIG. 8 is a schematic structural diagram of a passive optical network system according to an embodiment of the present invention. detailed description
  • Embodiments of the present invention provide a method for ONU power down processing. The details will be described in detail below with reference to the accompanying drawings.
  • FIG. 2 is a flowchart of a method for power-down processing of an optical network unit according to an embodiment of the present invention.
  • a flowchart of a method for power-off processing of an ONU according to an embodiment of the present invention is specifically described below with reference to FIG.
  • the optical network unit ONU or the optical network terminal ONT is collectively referred to as an optical network unit.
  • the optical network unit ONU is described as an example, but is not limited to the ONU, and is also applicable to the ONT.
  • An OLT device (hereinafter referred to as ONU) can be connected to multiple ONUs.
  • step S200 the OLT acquires ONU power down maintenance information;
  • the OLT requests to obtain the power-off maintenance information of the ONU by sending a request for the ONU to power down the maintenance information to the ONU.
  • the OLT sends a request for the ONU power down maintenance information to the network side device, requesting to obtain the power down maintenance information of the ONU.
  • the power-down maintenance information includes: a power-down maintenance time and/or a power-down maintenance parameter, etc., and the power-down maintenance time is a time during which the ONU can maintain communication with the OLT after the main power is cut off.
  • the power-down maintenance parameter may include: one or more of the capacitance capacity C of the power-down maintenance module, the voltage difference dV between the capacitors, and the current I during the capacitor discharge, and may also include other power-related parameters.
  • FIG. 3 is a flowchart of a method for acquiring power-down maintenance information of an optical network unit according to an embodiment of the present invention. Referring to FIG. 3 in detail, a method for an OLT to obtain an ONU power-down maintenance information by sending an ONU power-down maintenance information request to an ONU is described in detail below. .
  • step S300 the OLT sends a request for acquiring ONU power down maintenance information to the ONU, requesting acquisition of ONU power down maintenance information.
  • the request sent by the OLT may be sent to the specified ONU through the unicast message, or may be sent to all the ONUs through the broadcast message; the OLT may send a request for obtaining the ONU power failure maintenance information to the ONU through a specific message format, the specific The message format includes any combination of one or more of an embedded operation management and maintenance (Embedded OAM message), a physical layer operation management and maintenance PLOAM message, and an optical network terminal management control interface OMCI message.
  • Embedded OAM message embedded operation management and maintenance
  • PLOAM physical layer operation management and maintenance
  • OMCI message optical network terminal management control interface
  • step S302 the ONU reports the power failure maintenance information to the OLT.
  • the ONU can report the power-down maintenance information in a specific message format.
  • the ONU sends the power-down maintenance information to the physical layer operation management and maintenance PLOAM message or the optical network terminal management control interface OMCI message, and reports it to the OLT.
  • the power-down maintenance information is carried in the optical network terminal management control interface OMCI message, and the implementation method thereof is specifically described:
  • the ONU stores the power-down maintenance information in a specific attribute of the ONT-G ME, and the specific attribute is read-only. Or a readable and writable attribute, the specific attributes of the ONT-G ME are described as follows:
  • ONT survival time This attribute indicates the minimum guaranteed time in milliseconds between the loss of external power and the silence of the ONT. This does not include survival time attributable to a backup battery. The value zero implies that the actual time is not known. (R) (optional) (1 byte)
  • the ONU may report the attribute value to the OLT in the optical network terminal management control interface OMCI message.
  • the ONU can actively report the power-down maintenance information and the power-down indication to the OLT through a specific message format when the power is off.
  • the ONU carries the power-down maintenance information and the power-down indication on the physical layer to manage and maintain the PLOAM message or light.
  • the network terminal management control interface OMCI message is reported to the OLT.
  • the power-down maintenance time may be pre-configured in the ONU, or may be the power-down maintenance time that the ONU dynamically calculates according to the power-down maintenance parameter, and the power-down maintenance parameter may be Pre-configured in the ONU, it can also be obtained dynamically.
  • the lowest voltage value on the capacitor that the ONU system normally supplies is 5 V
  • the discharge current of the rear capacitor is calculated by the formula to calculate the power-down maintenance time of the ONU.
  • the power-down maintenance time and/or power-down maintenance parameter pre-configured in the ONU can be a specific The value is either an interval value or a pre-agreed value of the OLT or ONU to indicate that the ONU does not support the power down indication function (such as dying gasp).
  • the OLT needs to calculate the power-down maintenance time according to the power-down maintenance parameter.
  • the specific calculation method is the same as the method used by the ONU to calculate the power-down maintenance time, and details are not described herein again.
  • Step S300 and step S302 do not have the requirement of executing the sequence.
  • the ONU may actively report the ONU power-down maintenance information, or may receive a request for acquiring the ONU power-down maintenance information sent by the OLT. After that, the ONU is powered down to maintain the information for reporting. When the ONU actively reports, step S300 may not be performed.
  • the foregoing describes in detail the method for the OLT to obtain the power-down maintenance information from the ONU.
  • the OLT can also obtain the ONU power-down maintenance information from the service-side device.
  • the service-side device can power down the ONU to maintain the information and the ONU identifier, or drop the ONU.
  • the electrical maintenance information is associated with the model of the ONU and stored in the memory.
  • the ONU identifier includes: any combination of one or more of the serial number SN of the ONU, the password password of the ONU, or the MAC address of the ONU.
  • the service-side device can search for the power-down maintenance information of the corresponding ONU according to the identifier or model of the ONU and send it to the OLT.
  • the OLT performs the power-down maintenance time calculation according to the power-down maintenance parameter.
  • the specific method is the same as the step S300, and details are not described herein again.
  • the power-down maintenance information may be pre-configured in the OLT. At this time, if the pre-configured power-down maintenance information is the power-down maintenance parameter, the OLT will perform the power-down maintenance time calculation according to the power-down maintenance parameter. Same as step S302, and details are not described herein again. If pre-matched The power-down maintenance information is set to the power-down maintenance time, and the OLT does not need to perform step S300.
  • the electrical maintenance information is processed and/or diagnosed. Specifically, if the OLT does not receive the power-off indication of the ONU when the ONU is offline, it determines whether the ONU is dropped due to the ONU power-off according to the ONU power-down maintenance time, and generates a judgment result.
  • the judgment result may be expressed in the form of a probability. For example, if the ONU power-down maintenance time is long (for example, greater than Is), the ONU is dropped due to the ONU power failure probability of 0%; if the ONU power-down maintenance time If it is short (such as less than lms), the ONU is dropped because the probability of the ONU being powered down is 50%.
  • Some ONUs can only maintain a short power-down hold time of 4 ⁇ due to implementation reasons or other reasons. If the power-down indication cannot be sent during the power-down maintenance time, it may cause the OLT to occur during the ONU power-down processing. Misjudgment. There are three ways to improve the probability that the ONU will report a power-down indication, thus providing more accurate input for troubleshooting. should.
  • the OLT determines whether the ONU power failure indication request number exceeds the system processing capability. If the system processing capability is exceeded, the OLT determines the priority of each ONU power failure indication request according to the ONU power failure maintenance time. Level, response processing based on priority.
  • the ONU power-down indication request is that when the ONU is powered off, the ONU is instructed to be powered down, and the power-off condition of the ONU is reported to the OLT; and the ONU power-down maintenance time is determined to ensure that all the ONUs can be powered down.
  • the report of the power failure indication is completed within the maintenance time. For example, ONU The shorter the power-down maintenance time, the higher the priority, and the OLT responds preferentially.
  • the ONU can complete the reporting of the power-down indication within the power-down maintenance time, improve the stability of the power-down indication when the ONU is powered down, and thus provide more accurate input for fault diagnosis.
  • Method 2 When the ONU is powered off, the ONU power-down indication is reported by a specific bit in the uplink frame. For example, the fourth bit of the Ind Field field in the uplink frame header is used to perform the power-down event indication. When the bit is 0. The message indicates that the message does not carry the ONU power-down indication. When the bit is 1, the message carries the ONU power-down indication. The method is further described below in conjunction with FIG. 4:
  • FIG. 4 is a flow chart of a method for powering down a power failure on an optical network unit according to an embodiment of the present invention.
  • step S400 the ONU main power source is turned off.
  • the main power failure may be caused by the user turning off the ONU, or it may be caused by the external power interruption of the ONU.
  • the ONU receives the bandwidth allocated by the OLT.
  • the bandwidth may be allocated by the OLT to the ONU to transmit communication data, or may be allocated by the OLT to the ONU to transmit maintenance management information;
  • step S404 the ONU reports a power down indication.
  • the ONU can set a specific bit of the uplink header to a specific value to indicate that the ONU is powered down.
  • the ONU reports the ONU power down indication by using the bandwidth allocated by the OLT in step S402. There is no sequential execution sequence between step S400 and step S402, and step S402 can be performed before step S400.
  • the method can reduce the number of interactions between the ONU and the OLT when reporting the power failure indication, speed up the ONU reporting the power failure indication speed, and improve the stability of the power failure indication when the ONU is powered down. Provides more accurate input for troubleshooting.
  • Method 3 When the ONU is powered off, the ONU selects the circuit to continue to operate according to its power-down maintenance capability, and reports the power-down indication to the OLT.
  • the power-down indication circuit can be cut off; if the ONU power-down maintenance capability is strong, the power-off indication circuit can be retained except the report power-down indication circuit.
  • Other core circuits than others. For example, the capacity of the ONU power-down capacitor can only ensure that the ONU reports the power-down indication circuit to complete the power-down indication, and the ONU can cut off all circuits except the power-down indication circuit.
  • the ONU power-off maintenance time is extended by cutting off the unimportant circuit, thereby ensuring the normal operation of the power-down indication circuit, and improving the stability of the power-down indication when the ONU is powered down, and further More accurate input can be provided for troubleshooting.
  • FIG. 5 is a schematic structural diagram of an optical line terminal according to an embodiment of the present invention.
  • An optical line terminal OLT 50 may include: a first storage module 508 and a power down processing module 506.
  • the first storage module 508 is configured to store a power down maintenance time of the ONU.
  • the power-down maintenance time may be pre-configured in the OLT 50, or may be obtained by the OLT 50 sending an ONU power-down maintenance information request to the ONU or the service-side device; or the OLT 50 may send the ONU power-down maintenance information to the ONU or the service-side device. After obtaining the ONU power-down maintenance parameter, it is obtained according to the ONU power-down maintenance parameter calculation.
  • the power-down processing module 506 is configured to process the optical network unit according to the power-off maintenance time of the optical network unit stored by the first storage module 508 when the optical network unit is offline.
  • the OLT 50 further includes a power-down maintenance information acquisition module 502 when requesting the acquisition of the ONU power-down maintenance time:
  • the power-down maintenance information acquisition module 502 is configured to send an ONU power-down maintenance information request to the ONU or the service-side device, and receive the ONU power-down maintenance information sent by the ONU or the service-side device, and power-off the ONU to maintain the information storage.
  • the power down maintenance information is a power down maintenance time.
  • the OLT 50 further includes a power down maintenance information acquisition module 502 and a power down maintenance time calculation module 504 when the ONU power down maintenance parameter is obtained.
  • the power-down maintenance information acquisition module 502 is configured to send an ONU power-down maintenance information request to the ONU or the service-side device, and receive the ONU power-down maintenance information sent by the ONU or the service-side device.
  • the power down maintenance information is a power down maintenance time.
  • the power-down maintenance time calculation module 504 is configured to calculate an ONU power-down maintenance time according to the ONU power-down maintenance parameter acquired by the OLT 50, and store the ONU power-down maintenance time in the first storage module 508.
  • the power down processing module 506 includes, but is not limited to, a group of any one or more of the following processes
  • Diagnosis specifically: If
  • the OLT 50 does not receive the power-off indication of the ONU. Based on the ONU power-down maintenance time, it is determined whether the ONU is dropped due to the ONU power failure, and the judgment result is generated.
  • the judgment result may be expressed in the form of probability. For example, if the ONU is powered down for a long time (eg, greater than Is), the ONU is dropped because the ONU is powered down. The probability is 0%. If the ONU is powered down for a short time (eg, less than 1 ms), the ONU is dropped.
  • the probability that the ONU is powered down is 50%; when a large number of ONUs Should, for example, the ONU with a short power-off hold time responds preferentially to its power-down indication request to ensure that all ONUs can complete the power-down indication during the power-down maintenance time.
  • FIG. 6 is a schematic structural diagram of an optical network unit according to an embodiment of the present invention.
  • An optical network unit 60 may include: a second storage module 604 and a power failure maintenance information reporting module 602.
  • the second storage module 604 is configured to store power-down maintenance information of the ONU.
  • the power-down maintenance information includes: a power-down maintenance time and/or a power-down maintenance parameter, etc., and the power-down maintenance time is a time during which the ONU can maintain communication with the OLT after the main power is cut off.
  • the power-down maintenance parameter may include: a power-down maintaining module capacitance capacity C, a voltage difference dV between the capacitors, and a current I during the capacitor discharge.
  • the power-down maintenance time may be pre-configured in the ONU, or may be obtained by the ONU according to the ONU power-down maintenance parameter dynamic calculation.
  • the power-down maintenance information reporting module 602 is configured to receive an ONU power-down maintenance information request of the OLT and send the ONU power-down maintenance information to the OLT.
  • the ONU When the ONU dynamically calculates the ONU power-down maintenance time according to the power-down maintenance parameter, the ONU further includes a power-down maintenance time calculation module 606, configured to calculate the ONU power-down maintenance time according to the ONU power-down maintenance parameter and store it in the first Two storage modules 604.
  • the ONU's power-down maintenance time is calculated by the formula.
  • the ONU further includes a power-down maintenance time extension module 608, which is used to extend the time when the ONU continues to work when the power is off. To ensure that the ONU can accurately report the power-down indication to the OLT when the power is off.
  • FIG. 7 is a schematic structural diagram of a power-down maintenance time extension module in an optical network unit according to an embodiment of the present invention.
  • the power-down maintenance time extension module 608 is described in detail below with reference to FIG. 7, and the power-down maintenance time extension module 608 is further described. Includes:
  • the main power module 702 is configured to supply power when the ONU is working normally;
  • the power-down maintenance module 704 is configured to supply power to the core circuit 708 when the main power source is cut off; the main power source is cut off, including but not limited to manually turning off the ONU, unplugging the ONU external power source, and the ONU external power failure;
  • the core circuit 708 is configured to: when the ONU is powered off, report the ONU power failure indication to the OLT; and the power control module 706 is configured to: after the main power in the main power module 702 is cut off, start the power failure maintenance module 704, at least The core circuit 708 is powered to ensure that the ONU reports the ONU power down indication during the power down maintenance period.
  • FIG. 8 is a schematic structural diagram of a passive optical network system according to an embodiment of the present invention.
  • a passive optical network system includes: an optical line terminal 50, an optical network unit 60, and an optical distribution network 80.
  • the optical line terminal 50 is configured to store the power failure maintenance information of the optical network unit 60.
  • the power-down maintenance information includes: a power-down maintenance time and/or a power-down maintenance parameter; the optical network unit 60 is configured to provide power-down maintenance information of the optical network unit 60, and the optical network unit 60
  • the power down maintenance information is transmitted to the optical line terminal 50.
  • the optical distribution network 80 is configured to connect the optical line terminal 50 and the at least one optical network unit 60 and to distribute or multiplex data signals between the optical line terminal 50 and the at least one optical network unit 60.
  • the optical line terminal 50 specifically includes: a first storage module 508 and a power-down processing module.
  • the first storage module 508 is configured to store power-down maintenance information of the optical network unit 60, where the power-down maintenance information includes: a power-down maintenance time and/or a power-down maintenance parameter; When the optical network unit 60 is disconnected, the optical network unit 60 is processed according to the power down maintenance time of the optical network unit 60.
  • the OLT When the OLT requests to obtain the ONU power-down maintenance time by sending an ONU power-down maintenance information request to the ONU or the service-side device, the OLT further includes a power-down maintenance information acquiring module 502, configured to send the ONU power-off to the ONU or the service-side device. And maintaining the information request, and receiving the ONU power-down maintenance information sent by the ONU or the service-side device, and storing the ONU power-down maintenance information in the first storage module 508, wherein the power-down maintenance information is a power-down maintenance time.
  • a power-down maintenance information acquiring module 502 configured to send the ONU power-off to the ONU or the service-side device. And maintaining the information request, and receiving the ONU power-down maintenance information sent by the ONU or the service-side device, and storing the ONU power-down maintenance information in the first storage module 508, wherein the power-down maintenance information is a power-down maintenance time.
  • the OLT When the OLT requests to obtain the power-down maintenance parameter by sending an ONU power-down maintenance information request to the ONU or the service-side device, the OLT further includes a power-down maintenance information acquisition module 502 and a power-down maintenance time calculation module 504.
  • the power-down maintenance information acquisition module 502 is configured to send an ONU power-down maintenance information request to the ONU or the service-side device, and receive the ONU power-down maintenance information sent by the ONU or the service-side device, where the power-down maintenance information is
  • the power-down maintenance time calculation module 504 is configured to calculate an ONU power-down maintenance time according to an ONU power-off maintenance parameter acquired by the OLT, And storing it in the first storage module 508.
  • the optical network unit 60 specifically includes: a second storage module 604 and a power failure maintenance information reporting module 602;
  • the second storage module 604 is configured to store the power-down maintenance information of the optical network unit 60.
  • the power-down maintenance information includes: a power-down maintenance time and/or a power-down maintenance parameter.
  • the power-down maintenance information reporting module 602 And receiving a power down maintenance information request from the optical network unit 60 sent by the optical line terminal 50, and transmitting the optical network power down maintenance information to the optical line terminal 50 according to the request.
  • the ONU When the ONU dynamically calculates the ONU power-down maintenance time according to the power-down maintenance parameter, the ONU further includes a power-down maintenance time calculation module 606, configured to calculate the ONU power-down maintenance time according to the ONU power-down maintenance parameter and store it in the first Two storage modules 604.
  • a power-down maintenance time calculation module 606 configured to calculate the ONU power-down maintenance time according to the ONU power-down maintenance parameter and store it in the first Two storage modules 604.
  • the ONU further includes a power-down maintenance time extension module 608, which is used to extend the time when the ONU continues to work when the power is off. To ensure that the ONU can accurately report the power-down indication to the OLT when the power is off.
  • the optical distribution network 80 includes: a backbone fiber and an optical splitter for connecting the optical line terminal 50 and the optical network unit 60 through a trunk fiber and an optical splitter.
  • the information about the power-down maintenance of the optical network unit is obtained, where the power-down maintenance information includes: a power-down maintenance time and/or a power-down maintenance parameter; when the optical network unit is offline, according to the light
  • the power-down maintenance information of the network unit performs power-down processing on the optical network unit, and solves the problem that the optical line terminal cannot correctly determine the power-down problem of the optical network unit when the optical network unit is powered down or the optical distribution network is faulty in the prior art.
  • the optical network unit completes the reporting of the power-down indication during the power-down maintenance time, which improves the stability of the power-down indication reported by the optical network unit, thereby providing a more accurate input for fault diagnosis.

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Description

一种光网络单元掉电处理的方法、 装置及系统 本专利申请要求于 2008 年 9 月 2 日提交中国专利局、 申请号为 200810141754.3、 发明名称为 "一种光网络单元掉电处理的方法、 装置及 系统" 的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信领域的网络技术， 具体指一种光网络单元掉电处理的 方法、 装置及系统。 背景技术
通用的无源光网络（ Passive Optical Network , 简称 PON )技术， 是一种 点对多点方式的光接入技术。 PON网络由光线路终端（ Optical Line Terminal , 简称 OLT ) 、 光分配网络（Optical Distribution Network, 简称 ODN ) 、 光网 络单元（ Optical Network Unit, 简称 ONU )组成。 如图 1所示， 图 1为现有技 术中一种无源光网络系统结构图， OLT为 ΡΟΝ系统提供网络侧接口， 连接一 个或多个 ODN; ODN是无源光分配网络， 用于连接光线路终端 OLT和光网络 单元 ONU或光网络终端 ΟΝΤ , 用于分发或复用 OLT和 ONU或 ΟΝΤ之间的数据 信号； ONU或 ΟΝΤ为 ΡΟΝ系统提供用户侧接口， 与 ODN相连。 下面将 ONU或 ΟΝΤ统一称为光网络单元 ONU。
当 ODN故障或 ONU掉电后， 都会导致 OLT收不到对应 ONU的上行光信 号。 PON标准规定， 当 OLT连续多次在给 ONU分配的时隙内无法接收到 ONU 的光信号时， OLT则产生 ONU信号丟失告警信息例如 LOSi告警， 以示该 ONU 掉线。 同时， PON标准中还规定， 如果 OLT收到 ONU的掉电指示 (例如
GPON/EPON标准定义的 Dying Gasp), 则 OLT可以忽略该 ONU的所有后续的 告警。 即虽然 ONU掉电或 ODN故障最终都具有相同的结果 (OLT收不到 ONU 的上行光信号）， 但是 ONU掉电情况与 ODN故障有本质不同， 因此 ONU掉电 时， OLT不再进行 LOSi告警， 只给出掉电通知， 这样可以避免 ONU掉电时仍 需要派遣工程师进行维修， 进而降低维护成本。 但是目前， 由于有些 ONU不 支持掉电指示功能，则当这些 ONU掉电时， OLT收不到掉电指示通知，则 OLT 就会发出 ONU信号丟失告警， 会误判为 ODN故障或不能确定是否为掉电事 件， 导致不必要的维护成本。 另外， 虽然有些 ONU也具有掉电指示功能， 但 是由于 OLT的处理能力及 ONU自己掉电维持能力的限制 (ONU上传需要 OLT 授权)， 当多个 ONU同时掉电时，也许由于 ONU能力不够或者 OLT不能及时进 行授权， 导致 ONU的掉电指示未能及时上传给 OLT, 导致 OLT误判为 ODN故 障， 进而导致不必要的维护成本。
现有技术中， 当 OLT在连续多次给 ONU分配的时隙内无法接收到 ONU的 光信号时， OLT则产生告警信息例如 LOSi告警，以示该 ONU掉线。但发生 LOSi 告警可能是 ONU掉电导致， 也可能是 ONU所连接的光纤故障等原因导致。 如 果是 ONU掉电导致， 则不需要派遣维护工程师进行维护； 如果是 ONU所连接 的光纤故障等原因导致， 则需要派遣维护工程师进行维修。 为此， PON标准 规定， ONU在掉电时需要通过 Dying Gasp消息将自身的掉电事件上报给 OLT, 以避免在 ONU掉电时仍派遣工程师进行维修。
在实现本发明的过程中， 发明人发现现有技术至少存在以下问题： 当 同一个 OLT下， ONU的掉电维持能力未知或 OLT处理能力有限时， 当发 生 ONU掉电或 ODN故障时， OLT不能正确判断是 ONU掉电问题还是 ODN故障的问题， 导致 OLT无法对掉电的 ONU进行及时准确的掉电处 理。 发明内容
有鉴于此， 本发明实施例的主要目的在于提供一种光网络单元掉电处 理的方法、 装置及系统， 用以获取 ONU掉电维持信息， 并根据掉电维持 信息对 ONU的掉线事件进行处理和诊断，为故障诊断提供更精确的输入。
为实现上述目的， 本发明实施例提供如下的技术方案：
一种光网络单元掉电处理的方法， 所述方法包括： 获取光网络单元的 掉电维持信息， 其中， 所述掉电维持信息包括： 掉电维持时间和 /或掉电维 持参数； 当光网络单元掉线时， 根据所述光网络单元的掉电维持信息， 对 光网络单元执行掉电处理。
一种获取光网络单元掉电维持信息的方法， 所述方法包括： 接收来自 光线路终端发送的获取光网络单元掉电维持信息的请求； 根据所述请求， 发送光网络单元掉电维持信息给光线路终端， 其中， 所述掉电维持信息包 括： 掉电维持时间和 /或掉电维持参数。
一种光线路终端， 包括： 第一存储模块和掉电处理模块； 所述第一存 储模块， 用于存储光网络单元的掉电维持信息， 所述掉电维持信息包括： 掉电维持时间和 /或掉电维持参数； 所述掉电处理模块， 用于当光网络单元 掉线时， 根据光网络单元的掉电维持时间对光网络单元进行处理。 一种光网络单元， 包括： 第二存储模块和掉电维持信息上报模块； 所 述第二存储模块， 用于存储光网络单元的掉电维持信息； 所述掉电维持信 息包括： 掉电维持时间和 /或掉电维持参数； 所述掉电维持信息上报模块， 用于接收来自光线路终端发送的获取光网络单元掉电维持信息请求， 根据 所述请求， 将所述光网络单元的掉电维持信息发送给光线路终端。
一种无源光网络系统， 包括： 光线路终端、光网络单元和光分配网络； 所述光线路终端， 用于存储光网络单元的掉电维持信息， 当光网络单 元掉线时， 根据光网络单元的掉电维持时间对光网络单元进行处理； 所述 掉电维持信息包括： 掉电维持时间和 /或掉电维持参数；
所述光网络单元，用于提供光网络单元的掉电维持信息,并将所述光网 络单元的掉电维持信息发送给所述光线路终端。
所述光分配网络， 用于连接光线路终端和至少一个光网络单元， 并用 于分发或复用光线路终端和至少一个光网络单元之间的数据信号。
本发明实施例通过获取光网络单元的掉电维持信息； 当光网络单元掉 线时，根据所述光网络单元的掉电维持信息，对光网络单元执行掉电处理， 解决了现有技术中光网络单元掉电或光分配网络故障时， 光线路终端无法 正确判断光网络单元的掉电问题， 保证了光网络单元在掉电维持时间内完 成掉电指示的上报， 提高了光网络单元上报掉电指示的稳定性， 进而为故 障诊断提供更精确的输入。 附图说明
图 1为现有技术中一种无源光网络系统结构图； 图 2为本发明实施方式中一种光网络单元掉电处理的方法流程图； 图 3为本发明实施方式中一种获取光网络单元掉电维持信息的方法流 程图；
图 4为本发明实施方式中一种光网络单元上报掉电指示的方法流程 图；
图 5为本发明实施方式中一种光线路终端的组成结构示意图； 图 6为本发明实施方式中一种光网络单元的组成结构示意图； 图 7为本发明实施方式中一种光网络单元中掉电维持时间延长模块 的组成结构示意图；
图 8为本发明实施方式中一种无源光网络系统的组成结构示意图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚， 下面将结合附图对本 发明的实施例作进一步地详细描述。 本发明实施例提供了一种 ONU掉电 处理的方法。 下面具体结合下面的附图进行详细说明。
请参阅图 2, 图 2为本发明实施方式中一种光网络单元掉电处理的方 法流程图， 下面结合图 2对本发明一实施方式中一种 ONU掉电处理的方 法流程图作具体介绍。
下面将光网络单元 ONU或光网络终端 ONT统一称为光网络单元，如 图 2以光网络单元 ONU为例进行描述， 但不限于 ONU, 也适用于 ONT。 图中一个 OLT设备（下面简称 ONU ) 可以与多个 ONU相连。
在步骤 S200中， OLT获取 ONU掉电维持信息； OLT通过发送 ONU掉电维持信息的请求给 ONU, 请求获取 ONU的 掉电维持信息；
或者， OLT发送 ONU掉电维持信息的请求给网络侧设备， 请求获取 ONU的掉电维持信息。
所述掉电维持信息包括： 掉电维持时间和 /或掉电维持参数等， 所述掉电 维持时间为 ONU在主电源切断后能够维持与 OLT继续通信的时间。 所述掉电 维持参数可以包括： 掉电维持模块的电容容量 C, 电容两端电压差 dV以及电 容放电过程中的电流 I的一种或多种， 也可以包括其它与电源相关的参数。
图 3为本发明实施方式中一种获取光网络单元掉电维持信息的方法流程 图， 下面结合图 3详细描述， OLT通过发送 ONU掉电维持信息的请求给 ONU 获取 ONU掉电维持信息的方法。
在步骤 S300中， OLT发送获取 ONU掉电维持信息的请求给 ONU, 请求获取 ONU掉电维持信息。
OLT发送的请求可以通过单播报文发送给指定的 ONU, 也可以通过 广播报文发送给所有的 ONU; OLT可以通过特定的消息格式发送获取 ONU掉电维持信息的请求给 ONU, 所述特定的消息格式包括嵌入式运行 管理维护 Embedded OAM消息、物理层运行管理维护 PLOAM消息及光网 络终端管理控制接口 OMCI消息中的一种或几种的任意组合。
在步骤 S302中， ONU将所述掉电维持信息上报给 OLT。
ONU可以通过特定的消息格式上报掉电维持信息， 例如 ONU将掉电维持 信息承载在物理层运行管理维护 PLOAM消息或光网络终端管理控制接口 OMCI消息中， 上报给 OLT。 以所述掉电维持信息承载在光网络终端管理控制接口 OMCI消息中为例， 具体描述其实现方法： ONU将掉电维持信息存储在 ONT-G ME的特定属性中， 该特定属性为只读或可读可写属性， 所述 ONT-G ME的特定属性描述如下：
ONT survival time: This attribute indicates the minimum guaranteed time in milliseconds between the loss of external power and the silence of the ONT. This does not include survival time attributable to a backup battery. The value zero implies that the actual time is not known. (R) (optional) (1 byte)
当 OLT发送获取 ONU掉电维持信息的请求时， ONU可将该属性值承载在 光网络终端管理控制接口 OMCI消息中上报给 OLT。
另外， ONU还可以在掉电时主动将掉电维持信息和掉电指示通过特定消 息格式同时上报给 OLT, 例如 ONU将掉电维持信息和掉电指示承载在物理层 运行管理维护 PLOAM消息或光网络终端管理控制接口 OMCI消息中上报给 OLT。
当所述掉电维持信息为掉电维持时间时， 所述掉电维持时间可以预先配 置在 ONU中， 也可以是 ONU根据掉电维持参数动态计算获得的掉电维持时 间， 掉电维持参数可以预先配置在 ONU中， 也可以动态获得。 计算掉电维持 时间有多种方法， 例如通过公式 t=CdV/I可以计算得该时间， 其中 C为掉电维 持模块中的电容容量， dV为掉电前电容的电压和掉电后能维持 ONU系统正常 供电的电容上的最低电压值 (例如：电容充电电压 (ONU供电电压)为 5 V,电容维 持 ONU正常工作的最低电压 2V, 则 dV = 5 - 2 = 3V), I为掉电后电容的放电电 流， 通过公式计算出 ONU的掉电维持时间。
预先配置在 ONU中的掉电维持时间和 /或掉电维持参数可以是一个具体 的值或者是一个区间值， 还可以是 OLT、 ONU预先约定的取值， 以表示 ONU 不支持掉电指示功能（如 dying gasp )。
当所述掉电维持信息为掉电维持参数时， OLT需要根据掉电维持参数计 算掉电维持时间， 具体计算方法同 ONU计算掉电维持时间时所采用的方法， 这里不再赘述。
步骤 S300和步骤 S302没有执行顺序的要求， ONU在计算出 ONU的掉电维 持信息后， 可以将 ONU掉电维持信息主动上报， 也可以是当接收到 OLT发送 的获取 ONU掉电维持信息的请求后， 将 ONU掉电维持信息进行上报。 当 ONU 主动上报时， 可以不执行步骤 S300。
前面具体描述了 OLT从 ONU中获取掉电维持信息的方法， OLT还可 以从服务侧设备获取 ONU掉电维持信息，此时服务侧设备可以将 ONU掉 电维持信息和 ONU标识， 或者将 ONU掉电维持信息和 ONU的型号进行 关联并存储在存储器中， 所述 ONU标识包括： ONU的序列号 SN、 ONU 的密码 Password或者 ONU的 MAC地址的一种或多种的任意组合。
当 OLT将 ONU的标识或型号封装在 ONU掉电维持信息请求中发送 给服务侧设备， 服务侧设备可以根据 ONU的标识或型号查找对应的 ONU 的掉电维持信息并发送给 OLT。
如果 OLT获取的 ONU掉电维持信息为掉电维持参数， OLT将根据掉 电维持参数进行掉电维持时间计算，具体方法同步骤 S300，这里不再赘述。
除了上述方法， 还可将掉电维持信息预先配置在 OLT中， 此时， 如 果预先配置的掉电维持信息为掉电维持参数 , OLT将根据掉电维持参数进 行掉电维持时间计算， 具体方法同步骤 S302, 这里不再赘述。 如果预先配 置的掉电维持信息为掉电维持时间， OLT不需要执行步骤 S300。
当 ONU掉线时， 执行步骤 202, 进行 ONU掉电处理。 电维持信息， 进行处理和 /或故障诊断。 具体包括 ： 如果 ONU掉线时 OLT没 有接收到 ONU的掉电指示，则根据 ONU掉电维持时间判断 ONU掉线是否由于 ONU掉电导致的， 并生成判断结果。 所述的判断结果可以采用概率的形式表 示，例如，如果 ONU掉电维持时间很长（如大于 Is ) ,则 ONU掉线是由于 ONU 掉电导致的概率为 0%;如果 ONU掉电维持时间很短（如小于 lms ) , 则 ONU 掉线是由于 ONU掉电导致的概率为 50%。
由于有些 ONU由于实现原因或其他原因 ,只能维持 4艮短的掉电维持时间 , 如果在掉电维持时间内，不能把掉电指示发送出去，则有可能导致 OLT在 ONU 掉电处理时发生误判。 可以通过以下 3种方式来提高 ONU上报掉电指示的概 率， 从而为故障诊断提供更精确的输入。 应。
具体为： ONU接收到 ONU掉电指示请求时， OLT判断 ONU掉电指 示请求个数是否超出系统处理能力，若超出系统处理能力， OLT根据 ONU 掉电维持时间判断各 ONU掉电指示请求的优先级， 根据优先级进行响应 处理。 所述 ONU掉电指示请求为当 ONU掉电时， 指示 ONU掉电， 并将 所述 ONU的掉电情况上报给 OLT; 所述根据 ONU掉电维持时间判断各 保证所有 ONU都能在掉电维持时间内完成掉电指示的上报。 例如， ONU 掉电维持时间越短， 其优先级越高， OLT优先进行响应。
通过所述方法在多个 ONU同时发起掉电指示请求时， 保证了所有掉电
ONU都能在掉电维持时间内完成掉电指示的上报， 提高 ONU掉电时上报掉电 指示的稳定性， 进而可以为故障诊断提供更精确的输入。
方法 2:ONU掉电时， 通过上行帧中某个特定 bit进行 ONU掉电指示上报， 例如利用上行帧头中 Ind Field字段的第 4bit来进行掉电事件指示， 当该 bit为取 值为 0时表示该报文未携带 ONU掉电指示， 当该 bit为取值为 1时表示该报文携 带了 ONU掉电指示。 下面结合图 4对该方法进行进一步说明：
如图 4, 图 4为本发明实施方式中一种光网络单元上 4艮掉电指示的方法流 程图。
在步骤 S400中， ONU主电源被切断。 其中主电源掉电可能是用户关闭 ONU导致， 也可能是 ONU的外部电源中断导致；
在步骤 S402中， ONU接收到 OLT分配的带宽。 所述带宽可以是 OLT分配 给 ONU传输通信数据使用， 也可以是 OLT分配给 ONU传输维护管理信息使 用；
在步骤 S404中， ONU上报掉电指示。 其中， ONU可以将上行帧头的特定 bit置为特定的取值以表示该 ONU掉电。
其中， ONU利用步骤 S402中所述的 OLT分配的带宽上报 ONU掉电指示。 其中， 步骤 S400和步骤 S402之间没有先后执行顺序， 步骤 S402可以在步 骤 S400之前执行。
通过所述方法可以减少 ONU在上报掉电指示时与 OLT的交互次数， 加快 ONU上报掉电指示速度， 提高 ONU掉电时上报掉电指示的稳定性， 进而可以 为故障诊断提供更精确的输入。
方法 3: ONU掉电时， ONU根据其掉电维持能力选择继续工作的电路， 并上报掉电指示给 OLT。
具体为： 当主电源被切断后， 如果 ONU掉电维持能力较弱时， 可以切断 除上报掉电指示电路外的所有电路； 如果 ONU掉电维持能力较强， 则可以保 留除上报掉电指示电路以外的其他核心电路。 例如 ONU掉电维持电容的容量 只能保证 ONU上报掉电指示电路完成掉电指示上报， 则 ONU可以切断除上报 掉电指示电路外的所有电路。
通过所述方法在 ONU主电源被切断的情况下通过切断不重要电路， 延长 ONU掉电维持时间， 保证上报掉电指示电路正常运行， 提高了 ONU掉电时上 报掉电指示的稳定性， 进而可以为故障诊断提供更精确的输入。
请参阅图 5, 图 5为本发明实施方式中一种光线路终端的组成结构示意 图。
一种光线路终端 OLT50, 可以包括： 第一存储模块 508和掉电处理模 块 506。
所述第一存储模块 508 , 用于存储 ONU的掉电维持时间。
所述掉电维持时间可以预先配置在 OLT50中， 还可以是 OLT50通过 向 ONU或服务侧设备发送 ONU掉电维持信息请求获得；还可以是 OLT50 通过向 ONU或服务侧设备发送 ONU掉电维持信息请求获得 ONU掉电维 持参数后根据 ONU掉电维持参数计算获得。
所述掉电处理模块 506, 用于当光网络单元掉线时， 根据第一存储模 块 508存储的光网络单元的掉电维持时间， 对光网络单元进行处理。 i 寺信息请求，请求 获取 ONU掉电维持时间时， OLT50还进一步包括掉电维持信息获取模块 502:
所述掉电维持信息获取模块 502, 用于向 ONU或服务侧设备发送 ONU 掉电维持信息请求， 并接收 ONU或服务侧设备发送的 ONU掉电维持信息， 将所述 ONU掉电维持信息存储在第一存储模块 508中， 其中， 所述掉电维 持信息为掉电维持时间。 获取 ONU掉电维持参数时， OLT50还进一步包括掉电维持信息获取模块 502和掉电维持时间计算模块 504。
所述掉电维持信息获取模块 502, 用于向 ONU或服务侧设备发送 ONU 掉电维持信息请求并接收 ONU或服务侧设备发送的 ONU掉电维持信息。其 中， 所述掉电维持信息为掉电维持时间。
所述掉电维持时间计算模块 504, 用于根据 OLT50获取的 ONU掉电维 持参数， 计算 ONU掉电维持时间， 并将其存储在第一存储模块 508中。
所述掉电处理模块 506包括但不限于下列处理的任意一种或多种的组
：诊断， 具体为： 如果
ONU掉线时 OLT50没有接收到 ONU的掉电指示，则根据 ONU掉电维持时间判 断 ONU掉线是否由于 ONU掉电导致的， 并生成判断结果， 所述的判断结果可 以采用概率的形式表示， 例如， 如果 ONU掉电维持时间很长（如大于 Is ) , 则 ONU掉线是由于 ONU掉电导致的概率为 0%, 如果 ONU掉电维持时间很短 (如小于 lms ) ,则 ONU掉线是由于 ONU掉电导致的概率为 50%; 当大量 ONU 应， 如对掉电维持时间较短的 ONU优先响应其掉电指示请求， 以保证所有 ONU都能在掉电维持时间内完成掉电指示上 ·艮。
请参阅图 6, 图 6为本发明实施方式中一种光网络单元的组成结构示意 图。
一种光网络单元 60, 可以包括： 第二存储模块 604和掉电维持信息上报 模块 602。
所述第二存储模块 604, 用于存储 ONU的掉电维持信息。
所述掉电维持信息包括： 掉电维持时间和 /或掉电维持参数等， 所述掉电 维持时间为 ONU在主电源切断后能够维持与 OLT继续通信的时间。 所述掉 电维持参数可以包括： 掉电维持模块的电容容量 C, 电容两端电压差 dV以及 电容放电过程中的电流 I。 当所述掉电维持信息为掉电维持时间时， 所述掉电 维持时间可以预先配置在 ONU中， 还可以是 ONU根据 ONU掉电维持参数 动态计算所获得。
所述掉电维持信息上报模块 602, 用于接收 OLT的 ONU掉电维持信息 请求并将 ONU掉电维持信息发送给 OLT。
当 ONU根据掉电维持参数动态计算， 获得 ONU掉电维持时间时， ONU还 进一步包括掉电维持时间计算模块 606 , 用于根据 ONU掉电维持参数计算 ONU掉电维持时间并将其存储在第二存储模块 604中。计算掉电维持时间有多 种方法， 例如通过公式 t=CdV/I可以计算得该时间， 其中 C为掉电维持模块中 的电容容量， dV为掉电前电容的电压和掉电后能维持 ONU系统正常供电的电 常工作的最低电压 2V, 则 dV = 5 - 2 = 3V), I为掉电后电容的放电电流， 通过 公式计算出 ONU的掉电维持时间。
为了保证 ONU在掉电时能够在掉电维持时间内， 能将掉电指示准确地上 报给 OLT, ONU还进一步包括掉电维持时间延长模块 608,用于延长 ONU掉电 时继续工作的时间， 以保证 ONU在掉电时能准确地将掉电指示上报给 OLT。
图 7为本发明实施方式中一种光网络单元中掉电维持时间延长模块的组 成结构示意图， 下面结合图 7对掉电维持时间延长模块 608做详细的描述， 掉 电维持时间延长模块 608进一步包括：
主电源模块 702, 用于在 ONU正常工作时进行供电；
掉电维持模块 704, 用于在主电源被切断时为核心电路 708提供供电； 所 述主电源被切断包括但不限于人工关闭 ONU、拔掉 ONU外部电源、 ONU外部 电源故障等；
核心电路 708, 用于至少完成在 ONU掉电时，上报 ONU掉电指示给 OLT; 电源控制模块 706, 用于当主电源模块 702中的主电源被切断后， 启动掉 电维持模块 704 , 至少为核心电路 708供电， 以保证 ONU在掉电维持时间内 ONU掉电指示的上报。
请参阅图 8, 图 8为本发明实施方式中一种无源光网络系统的组成结构 示意图。
一种无源光网络系统， 包括： 光线路终端 50、 光网络单元 60和光分配 网络 80。
所述光线路终端 50, 用于存储光网络单元 60的掉电维持信息， 当光网络 单元 60掉线时，根据光网络单元 60的掉电维持时间对光网络单元 60进行处 理； 所述掉电维持信息包括： 掉电维持时间和 /或掉电维持参数； 所述光网络单元 60, 用于提供光网络单元 60的掉电维持信息,并将所述 光网络单元 60的掉电维持信息发送给所述光线路终端 50。
所述光分配网络 80,用于连接光线路终端 50和至少一个光网络单元 60, 并用于分发或复用光线路终端 50和至少一个光网络单元 60之间的数据信号。
其中， 所述光线路终端 50具体包括： 第一存储模块 508和掉电处理模块
506;
所述第一存储模块 508, 用于存储光网络单元 60的掉电维持信息， 所述 掉电维持信息包括： 掉电维持时间和 /或掉电维持参数； 所述掉电处理模块 506, 用于当光网络单元 60掉线时， 根据光网络单元 60的掉电维持时间对光 网络单元 60进行处理。
当 OLT通过向 ONU或服务侧设备发送 ONU掉电维持信息请求， 请求获取 ONU掉电维持时间时， OLT还进一步包括掉电维持信息获取模块 502, 用于向 ONU或服务侧设备发送 ONU掉电维持信息请求，并接收 ONU或服务侧设备发 送的 ONU掉电维持信息， 将所述 ONU掉电维持信息存储在第一存储模块 508 中， 其中， 所述掉电维持信息为掉电维持时间。
当 OLT通过向 ONU或服务侧设备发送 ONU掉电维持信息请求， 请求获得 掉电维持参数时， OLT还进一步包括掉电维持信息获取模块 502和掉电维持时 间计算模块 504。 所述掉电维持信息获取模块 502, 用于向 ONU或服务侧设备 发送 ONU掉电维持信息请求并接收 ONU或服务侧设备发送的 ONU掉电维持 信息， 其中， 所述掉电维持信息为掉电维持参数； 所述掉电维持时间计算模 块 504, 用于根据 OLT获取的 ONU掉电维持参数， 计算 ONU掉电维持时间， 并将其存储在第一存储模块 508中。
所述一种光网络单元 60具体包括：第二存储模块 604和掉电维持信息上 报模块 602;
所述第二存储模块 604, 用于存储光网络单元 60的掉电维持信息； 所述 掉电维持信息包括： 掉电维持时间和 /或掉电维持参数； 所述掉电维持信息上 报模块 602, 用于接收来自光线路终端 50发送的获取光网络单元 60的掉电 维持信息请求，根据所述请求，将光网络掉电维持信息发送给光线路终端 50。
当 ONU根据掉电维持参数动态计算， 获得 ONU掉电维持时间时， ONU 还进一步包括掉电维持时间计算模块 606,用于根据 ONU掉电维持参数计算 ONU掉电维持时间并将其存储在第二存储模块 604中。
为了保证 ONU在掉电时能够在掉电维持时间内， 能将掉电指示准确地上 报给 OLT, ONU还进一步包括掉电维持时间延长模块 608,用于延长 ONU掉电 时继续工作的时间， 以保证 ONU在掉电时能准确地将掉电指示上报给 OLT。
所述光分配网络 80包括： 主干光纤和光分离器， 用于通过主干光纤和光 分离器连接光线路终端 50和光网络单元 60。
本发明实施例中， 通过获取光网络单元掉电维持信息， 其中， 所述掉电 维持信息包括： 掉电维持时间和 /或掉电维持参数； 当光网络单元掉线时， 根 据所述光网络单元的掉电维持信息， 对光网络单元执行掉电处理，解决了现有 技术中光网络单元掉电或光分配网络故障时， 光线路终端无法正确判断光网 络单元的掉电问题， 保证了光网络单元在掉电维持时间内完成掉电指示的上 报， 提高了光网络单元上报掉电指示的稳定性， 进而为故障诊断提供更精确 的输入。 以上所述， 仅为本发明较佳的具体实施方式， 但本发明的保护范围并不 局限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可 轻易想到的变化或替换， 都应该涵盖在本发明的保护范围之内。 因此， 本发 明的保护范围应该以权利要求的保护范围为准。

Claims

权利要求
1、 一种光网络单元掉电处理的方法， 其特征在于， 所述方法包括： 获取光网络单元的掉电维持信息， 其中， 所述掉电维持信息包括： 掉 电维持时间和 /或掉电维持参数；
当所述光网络单元掉线时， 根据所述光网络单元的掉电维持信息， 对 所述光网络单元执行掉电处理。
2、 根据权利要求 1所述的光网络单元掉电处理的方法， 其特征在于， 所述获取光网络单元的掉电维持信息的步骤具体包括：
向光网络单元或服务侧设备发送获取掉电维持信息的请求；
接收所述光网络单元或服务侧设备返回的响应， 所述响应中包括： 光 网络单元的掉电维持信息。
3、 根据权利要求 2所述的光网络单元掉电处理的方法， 其特征在于， 所述发送获取掉电维持信息的请求给服务侧设备的步骤进一步包括：
将所述光网络单元的标识或型号承载在获取掉电维持信息的请求中， 以特定的帧格式发送给所述服务侧设备。
4、 根据权利要求 1所述的光网络单元掉电处理的方法， 其特征在于， 所述掉电维持信息为掉电维持参数时， 获取光网络单元的掉电维持信息的 步骤具体包括：
获取所述光网络单元的掉电维持参数， 所述掉电维持参数包括： 掉电 维持模块的电容容量 C, 电容两端电压差 dV以及电容放电过程中的电流 I的一种或多种；
根据所述掉电维持参数， 计算所述光网络单元的掉电维持时间， 并存 储所述光网络单元的掉电维持时间。
5、 根据权利要求 1所述的光网络单元掉电处理的方法， 其特征在于， 所述对光网络单元执行掉电处理的步骤进一步包括：
根据所述光网络单元的掉电指示请求， 通过掉电指示请求的优先级， 或者分配给所述光网络单元的带宽， 或者， 延长所述光网络单元的掉电维 持时间， 对所述光网络单元进行处理。
6、 根据权利要求 1所述的光网络单元掉电处理的方法， 其特征在于， 所述掉电维持信息被承载在光网络单元上报的特定消息， 所述特定消息包 括光网络终端管理控制接口 OMCI消息、 物理层运行管理维护 PLOAM消 息或嵌入式运行管理维护 Embedded OAM消息。
7、 根据权利要求 6所述的光网络单元掉电处理的方法， 其特征在于， 当所述特定消息为光网络终端管理控制接口 OMCI消息时， 所述掉电维持 信息被承载在所述 OMCI消息中一个被管理实体 ME的特定属性，且所述 特定属性为只读或者可读可写。
8、 根据权利要求 6所述的光网络单元掉电处理的方法， 其特征在于， 所述特定属性承载的掉电维持信息为掉电维持时间， 且当所述特定属性取 值为 0时， 所述特定属性表示所述光网络单元不支持掉电维持功能或掉电 维持时间未知。
9、 一种获取光网络单元掉电维持信息的方法， 其特征在于， 所述方 法包括：
接收来自光线路终端发送的获取光网络单元掉电维持信息的请求； 根据所述请求， 发送光网络单元掉电维持信息给光线路终端， 其中， 所述掉电维持信息包括： 掉电维持时间和 /或掉电维持参数。
10、 根据权利要求 9所述的获取光网络单元掉电维持信息的方法， 其 特征在于， 所述发送光网络单元的掉电维持信息给光线路终端的步骤进一 步包括：
当所述掉电维持信息为掉电维持参数时， 根据所述掉电维持参数， 计 算所述光网络单元的掉电维持时间， 其中， 所述掉电维持参数包括： 掉电 维持模块的电容容量 C, 电容两端电压差 dV以及电容放电过程中的电流 I的一种或多种；
将所述光网络单元的掉电维持时间承载在特定的消息中， 并发送给所 述光线路终端，其中所述特定的消息包括：嵌入式运行管理维护 Embedded OAM消息、 物理层运行管理维护 PLOAM消息及光网络终端管理控制接 口 OMCI消息中的一种或几种的任意组合。
11、 根据权利要求 10所述的获取光网络单元掉电维持信息的方法， 其特 征在于， 当采用 OMCI消息承载掉电维持信息时， 所述掉电维持信息存储在 ONT-G ME的特定属性中， 所述特定属性为只读或可读可写属性， 所述掉电 维持信息的取值表示光网络单元的掉电维持时间； 当所述特定属性取值为 0 时， 表示所述光网络单元不支持掉电维持功能或掉电维持时间未知。
12、 根据权利要求 9所述的获取光网络单元掉电维持信息的方法， 其 特征在于， 所述方法进一步包括：
接收所述光线路终端分配的带宽， 其中所述带宽包括： 传输数据使用 的带宽或者维护管理信息使用的带宽；
根据所述分配的带宽， 上报光网络单元的掉电指示。
13、 一种光线路终端， 其特征在于， 包括： 第一存储模块和掉电处理 模块； 所述第一存储模块， 用于存储光网络单元的掉电维持信息， 所述掉电 维持信息包括： 掉电维持时间和 /或掉电维持参数；
所述掉电处理模块， 用于当所述光网络单元掉线时， 根据光网络单元 的掉电维持时间对光网络单元进行处理。
14、 根据权利要求 13所述的光线路终端， 其特征在于， 进一步包括： 掉电维持信息获取模块和掉电维持时间计算模块；
所述掉电维持信息获取模块， 用于向光网络单元或服务侧设备发送光 网络单元掉电维持信息请求， 并接收光网络单元或服务侧设备发送的光网 络单元掉电维持信息， 将所述光网络单元掉电维持信息存储在所述第一存 储模块中， 其中， 所述掉电维持信息为掉电维持时间；
所述掉电维持时间计算模块， 用于根据光线路终端获取的光网络单元 掉电维持参数， 计算光网络单元掉电维持时间， 并将其存储在第一存储模 块中， 其中， 所述掉电维持参数包括： 掉电维持模块的电容容量 C, 电容 两端电压差 dV以及电容放电过程中的电流 I的一种或多种。
15、 一种光网络单元， 其特征在于， 包括： 第二存储模块和掉电维持 信息上报模块；
所述第二存储模块， 用于存储光网络单元的掉电维持信息； 所述掉电 维持信息包括： 掉电维持时间和 /或掉电维持参数；
所述掉电维持信息上报模块， 用于接收来自光线路终端发送的获取光 网络单元的掉电维持信息请求， 根据所述请求， 将光网络单元的掉电维持 信息发送给光线路终端。
16、 根据权利要求 15所述的光网络单元， 其特征在于， 进一步包括： 掉电维持时间计算模块， 用于根据光网络单元的掉电维持参数， 计算光 网络单元的掉电维持时间 , 并将所述掉电维持时间存储在第二存储模块中， 其中， 所述掉电维持参数包括： 掉电维持模块的电容容量 C, 电容两端电压差 dV以及电容放电过程中的电流 I的一种或多种。
17、 根据权利要求 16所述的光网络单元， 其特征在于， 进一步包括： 掉电维持时间延长模块， 用于延长光网络单元掉电时继续工作的时间， 以保证光网络单元在掉电时能准确地将掉电指示上报给光线路终端。
18、 根据权利要求 15所述的光网络单元， 其特征在于， 所述光网络单元 的掉电维持信息被承载在光网络终端管理控制接口 OMCI消息中一个被管理 实体 ME的特定属性， 且所述特定属性为只读或者可读可写。
19、 根据权利要求 18所述的光网络单元， 其特征在于， 所述特定属性承 载的掉电维持信息为掉电维持时间， 且当所述特定属性取值为 0时， 所述特定 属性表示所述光网络单元不支持掉电维持功能或掉电维持时间未知。
20、 一种无源光网络系统， 其特征在于， 包括： 光线路终端、 光网络单 元和光分配网络；
所述光线路终端， 用于存储光网络单元的掉电维持信息， 当光网络单元 掉线时， 根据光网络单元的掉电维持时间对光网络单元进行处理； 所述掉电 维持信息包括： 掉电维持时间和 /或掉电维持参数；
所述光网络单元， 用于提供光网络单元的掉电维持信息,并将所述光网络 单元的掉电维持信息发送给所述光线路终端；
所述光分配网络，用于连接所述光线路终端和至少一个所述光网络单元， 并用于分发或复用所述光线路终端和至少一个所述光网络单元之间的数据信 号。
PCT/CN2009/073693 2008-09-02 2009-09-02 一种光网络单元掉电处理的方法、装置及系统 Ceased WO2010025668A1 (zh)

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