WO2018184340A1 - 一种无源光网络中拓扑确定、构建的方法及装置 - Google Patents

一种无源光网络中拓扑确定、构建的方法及装置 Download PDF

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Publication number
WO2018184340A1
WO2018184340A1 PCT/CN2017/098276 CN2017098276W WO2018184340A1 WO 2018184340 A1 WO2018184340 A1 WO 2018184340A1 CN 2017098276 W CN2017098276 W CN 2017098276W WO 2018184340 A1 WO2018184340 A1 WO 2018184340A1
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Prior art keywords
optical network
extension box
distance extension
distance
box
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PCT/CN2017/098276
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English (en)
French (fr)
Inventor
耿丹
张伟良
袁立权
马壮
杨波
郭勇
Original Assignee
中兴通讯股份有限公司
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Priority to EP17904689.1A priority Critical patent/EP3609096A4/en
Publication of WO2018184340A1 publication Critical patent/WO2018184340A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/12—Discovery or management of network topologies
    • 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
    • H04B10/29—Repeaters
    • 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
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/20—Hop count for routing purposes, e.g. TTL
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/62—Wavelength based

Definitions

  • the present application relates to, but is not limited to, the field of communications, and more particularly to a method and apparatus for topology determination and construction in a Passive Optical Network (PON), a distance extension box and an optical line terminal (OLT).
  • PON Passive Optical Network
  • OLT optical line terminal
  • the topology of the PON system is shown in Figure 1.
  • the PON system usually consists of an optical line terminal (OLT) on the central office, an optical network unit (ONU) on the user side, and an optical distribution network (ODN).
  • ONT optical line terminal
  • the point-to-multipoint network is usually used. structure.
  • ODN consists of passive optical components such as single-mode fiber and optical splitter, optical connector, etc., providing optical transmission medium for the physical connection between OLT and ONU.
  • the optical power budget of the existing PON system cannot meet the error rate of the signal that the OLT and the ONU normally communicate. It is necessary to add an expansion box in the PON system to amplify the signals transmitted by the OLT and the ONU.
  • An expansion box is added between the OLT and the ODN.
  • the PON system after the expansion box is added can support normal communication when the OLT and the ONU are far away. Since the length of the fiber between the OLT and the distance extender (RE) is long, the fiber is prone to failure, so the protection of the fiber needs to be considered.
  • the PON system is very sensitive to price because it is close to the user's system. It is hoped that the PON system will be economical, minimize redundant equipment, and reduce the cost of the PON system. In the case where only the protection of the optical fiber is considered without increasing the redundant OLT and RE in the system, how the OLT and the RE implement the protection switching, there is currently no solution.
  • the OLT needs to know which ONUs are connected under each RE, that is, the OLT needs to know the topology of the entire PON system, and there is currently no solution.
  • Embodiments of the present invention provide a method and apparatus for determining and constructing a topology in a passive optical network, a distance expansion box and an optical line terminal, to implement a passive optical network topology with a distance expansion box.
  • a method for topology determination in a passive optical network comprising:
  • the extension box reports one or more of the following information to the optical line terminal:
  • the distance expansion box identification information
  • Uplink data is received in an uplink bandwidth corresponding to a bandwidth allocation carried by a downlink frame corresponding to the specified superframe counter value
  • the distance extends the value of the timestamp corresponding to the box local timer.
  • the method before the distance expansion box reports the identification information of the optical network unit associated with the distance extension box to the optical line terminal, the method further includes:
  • the distance extension box determines an optical network unit associated with the distance extension box.
  • the distance expansion box determines an optical network unit associated with the distance extension box by:
  • the distance extension box listens to an uplink frame sent by the optical network unit, and reads identifier information of the optical network unit;
  • the distance extension box listens to the ranging request message sent by the optical line terminal to the optical network unit, where the ranging request message carries the identification information of the optical network unit that needs to be ranging and the transmission to the optical network unit. Registering the uplink bandwidth of the message; if the distance extension box receives the uplink data of the optical network unit in the uplink bandwidth, the identifier information of the optical network unit carried in the ranging request message is recorded.
  • the distance extension box manages maintenance messages or light through physical layer operations.
  • the network unit management control interface message reports the identification information of the distance extension box and the identification information of the optical network unit associated with the distance extension box to the optical line terminal.
  • the distance expansion box notifies at least one of the downlink signal and the uplink signal, and when the switch is switched from the working channel to the standby channel, reporting, to the optical line terminal, the distance expansion box Identification information of the optical network unit.
  • the distance extension box does not detect at least one of the downlink signal and the uplink signal, and switches from the working channel to the standby channel, including:
  • the distance extension box can detect the downlink signal, but when the uplink signal cannot be detected, parse the bandwidth allocation field in the downlink frame, if there is an uplink bandwidth allocated to the optical network unit connected to the distance extension box in the downlink frame, If the uplink signal is not detected within the time corresponding to the uplink bandwidth, the active channel is switched to the standby channel.
  • the method further includes:
  • the distance extension box sends a handover message to the optical line terminal, carrying the following information: the identity identification information of the distance extension box and the information for completing the handover from the working channel to the standby channel.
  • the method before the distance expansion box reports information to the optical line terminal, the method further includes:
  • the registration response message carries at least one of the following information: identification information of the distance extension box, port information of the distance extension box, whether the distance extension box is equipped with protection interface information, and the distance expansion box Position information, port transmission power information of the distance extension box, and passive optical network identification information of the optical line terminal to which the distance expansion box is connected.
  • the method further includes:
  • the distance extension box receives an uplink bandwidth allocated by the optical line terminal, and the uplink bandwidth is used to report whether an uplink frame is received within an uplink bandwidth allocated to the optical network unit.
  • the method further includes:
  • the distance extension box receives the uplink frame in the uplink bandwidth, extract the value of the superframe counter carried in the downlink frame or record the value of the timestamp corresponding to the current local timer, and then in the uplink bandwidth. Reporting, to the optical line terminal, the identifier information of the distance extension box and the value of the superframe counter; or reporting, in the uplink bandwidth, the identifier information of the distance extension box and the distance extension to the optical line terminal The value of the timestamp corresponding to the box local timer.
  • a device for determining a topology in a passive optical network, disposed in a distance expansion box, comprising:
  • the reporting module is configured to report to the optical line terminal one or more of the following information: identifier information of the optical network unit associated with the distance extension box; identification information of the distance extension box; corresponding to the specified superframe counter value
  • the uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the downlink frame; the uplink data is received at the time corresponding to the local specified timestamp value of the distance extension box; the value of the superframe counter; the distance extension box local timer The value of the corresponding timestamp.
  • the device further includes:
  • a determining module configured to determine an optical network unit associated with the distance extension box before the reporting module reports the identification information of the optical network unit associated with the distance extension box to the optical line terminal.
  • the determining module is configured to: determine, by the following manner, an optical network unit that is associated with the distance extension box: listening for an uplink frame sent by the optical network unit, and reading identifier information of the optical network unit; Or listening to the ranging request message sent by the optical line terminal to the optical network unit, where the ranging request message carries the identifier information of the optical network unit that needs to be ranging and the uplink of the sending registration message that is allocated to the optical network unit.
  • the bandwidth information if the distance extension box receives the uplink data of the optical network unit in the uplink bandwidth, the identifier information of the optical network unit carried in the ranging request message is recorded.
  • the reporting module is configured to report the identification information of the distance extension box and the distance extension box to the optical line terminal by using a physical layer operation management maintenance message or an optical network unit management control interface message. Identification information of the associated optical network unit.
  • the device further includes:
  • the switching module is configured to switch from the working channel to the standby channel when at least one of the downlink signal and the uplink signal is not detected;
  • the reporting module is configured to report, to the optical line terminal, identification information of the optical network unit associated with the distance extension box after the switching module switches from the working channel to the standby.
  • the switching module is configured to detect a downlink signal, but when the uplink signal cannot be detected, parse the bandwidth allocation field in the downlink frame, if there is a downlink frame connected to the distance extension box.
  • the uplink bandwidth of the optical network unit is switched from the working channel to the standby channel when no uplink signal is detected within the time corresponding to the uplink bandwidth.
  • the switching module is further configured to: after switching from the working channel to the standby channel, send a switching message to the optical line terminal, carrying the following information: the identity identification information of the distance extension box and the completion of the work The information that the channel switches to the alternate channel.
  • the device further includes:
  • a registration module configured to receive a registration request of the optical line terminal, and return a registration response message to the optical line terminal, where the registration response message carries at least one of the following information
  • the identification information of the distance extension box, the port information of the distance extension box, whether the distance expansion box is equipped with protection interface information, the location information of the distance extension box, and the port transmission power information of the distance extension box And the passive optical network identification information of the optical line terminal to which the distance expansion box is connected.
  • the device further includes:
  • the receiving module is configured to receive an uplink bandwidth allocated by the optical line terminal, where the uplink bandwidth is used to report whether an uplink frame is received in an uplink bandwidth allocated to the optical network unit.
  • the device further includes:
  • a processing module configured to: if an uplink frame is received in the uplink bandwidth, extract a value of a superframe counter carried in the downlink frame, or record a value of a timestamp corresponding to the current local timer;
  • the reporting module is configured to report, to the optical line terminal, identifier information of the distance extension box and a value of the superframe counter in the uplink bandwidth, or report to the optical line terminal in the uplink bandwidth Identification information of the distance expansion box and the distance extension box local meter The value of the timestamp corresponding to the timer.
  • a distance extension box comprising means for topological determination in the passive optical network.
  • a device for topology determination in a passive optical network comprising a memory and a processor, wherein
  • the memory stores the following instructions: reporting one or more of the following information to the optical line terminal: identification information of the optical network unit associated with the distance extension box; identification information of the distance extension box;
  • the uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the downlink frame corresponding to the frame counter value; the uplink data is received at the time corresponding to the local specified timestamp value of the distance extension box; the value of the superframe counter; the distance extension The value of the timestamp corresponding to the box local timer;
  • the processor is configured to execute the instructions stored by the memory.
  • a method for topology construction in a passive optical network comprising:
  • the optical line terminal receives the distance expansion box to report one or more of the following information: the identification information of the optical network unit associated with the distance extension box, and the identification information of the distance extension box, in the downlink corresponding to the specified superframe counter value
  • the uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the frame, and the uplink data, the value of the superframe counter, and the distance extension box local timer are received at the time corresponding to the local timestamp value specified by the distance extension box.
  • the optical line terminal constructs a passive optical network topology based on the information.
  • the method before the optical line terminal receives the information reported by the extension box, the method further includes:
  • the optical line terminal When the distance extension box accesses the passive optical network, the optical line terminal sends a registration request to the distance extension box, and assigns identity identification information to the distance extension box.
  • the method before the optical line terminal receives the information reported by the extension box, the method further includes:
  • the optical line terminal allocates only one uplink bandwidth to one optical network unit in one downlink frame, and the downlink frame carries a superframe counter value;
  • the optical line terminal allocates an uplink bandwidth to all the distance extension boxes in the passive optical network system, and is used to report whether the uplink frame is received in the uplink bandwidth allocated to the optical network unit.
  • the method further includes:
  • the optical line terminal adjusts a ranging result of the optical network unit connected under the distance expansion box.
  • the optical line terminal adjusts a ranging result of the optical network unit connected to the distance expansion box, and includes:
  • the optical line terminal measures an optical network unit connected to the distance expansion box, and obtains an equalization delay difference that needs to be adjusted by the optical network unit;
  • the optical line terminal sends the equalization delay difference to all optical network units connected under the distance expansion box.
  • the optical line terminal adjusts a ranging result of the optical network unit connected to the distance expansion box, and includes:
  • the optical line terminal receives the handover message of the distance extension box, where the handover message carries the following information: identity identification information of the distance extension box and information for completing the handover from the working channel to the backup channel;
  • a device for topology construction in a passive optical network comprising:
  • the receiving module is configured to receive the distance expansion box to report one or more of the following information: the identifier information of the optical network unit associated with the distance extension box, and the identifier information of the distance extension box corresponds to the specified superframe counter value
  • Uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the downlink frame, and the uplink data, the value of the superframe counter, and the distance extension box local timer are received at the time corresponding to the local timestamp value specified by the distance extension box.
  • the value of the corresponding timestamp is configured to report one or more of the following information: the identifier information of the optical network unit associated with the distance extension box, and the identifier information of the distance extension box corresponds to the specified superframe counter value
  • Uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the downlink frame, and the uplink data, the value of the superframe counter, and the distance extension box local timer are received at the time corresponding to the local timestamp value specified by the distance extension box.
  • a building module constructs a passive optical network topology based on the information.
  • the device further includes:
  • a registration module configured to: when the distance extension box accesses the passive optical network, to the distance Send a registration request from the extension box;
  • an allocation module configured to assign identity information to the distance extension box.
  • the allocating module is further configured to allocate only one uplink bandwidth to one optical network unit in a downlink frame, where the downlink frame carries a superframe counter value; and is sent to the passive optical network system. All distance extension boxes are respectively allocated an uplink bandwidth for reporting from the extension box whether an uplink frame is received within an uplink bandwidth allocated to the optical network unit.
  • the device further includes:
  • an adjustment module configured to adjust a ranging result of the optical network unit connected to the distance expansion box, including: measuring an optical network unit connected to the distance expansion box, and obtaining a required optical network unit by ranging Adjusting the equalization delay difference; sending the equalization delay difference to all optical network units connected to the distance extension box, or receiving a handover message of the distance extension box, where the handover message carries the following information: Determining the identity information of the distance extension box and completing the information for switching from the working channel to the backup channel, and determining, according to the difference between the fiber lengths of the working channel and the backup channel, all the optical network units connected under the distance expansion box The equalization delay value to be adjusted is sent to all optical network units connected to the distance extension box.
  • An optical line terminal comprising a topology constructed device in the above passive optical network.
  • a device for topology construction in a passive optical network comprising a memory and a processor, wherein
  • the memory stores the following instructions: the receiving distance extension box reports one or more of the following information: identification information of the optical network unit associated with the distance extension box, and the identification information of the distance extension box is specified in the super
  • the uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the downlink frame corresponding to the frame counter value, and the uplink data, the value of the superframe counter, and the distance extension are received at the time corresponding to the local specified timestamp value of the distance extension box. a value of a timestamp corresponding to the box local timer; constructing a passive optical network topology according to the information;
  • the processor is configured to execute an instruction stored by the memory.
  • the embodiments of the present invention provide a method and a device for determining and constructing a topology in a passive optical network.
  • the distance expansion box and the optical line terminal can implement the determination and construction of a passive optical network topology with a distance expansion box.
  • Figure 1 is a topological diagram of a passive optical network.
  • FIG. 2 is a topological diagram of a long-haul passive optical network.
  • FIG. 3 is a flowchart of a method for constructing a passive optical network topology on a side of a distance expansion box according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a passive optical network topology for protecting an optical fiber between an OLT and an RE according to Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of performing protection switching between an OLT and an RE according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic diagram of a passive optical network topology of an optical fiber between a protection RE and a beam splitter in the scene 1 of the embodiment of the present invention
  • FIG. 7 is a schematic diagram of a passive optical network topology of an optical fiber between a protection RE and a beam splitter in scenario 2 of the embodiment of the present invention
  • FIG. 8 is a schematic diagram of a passive optical network topology for protecting an optical fiber between an RE and a splitter in a plurality of RE systems according to Embodiment 3 of the present invention
  • FIG. 9 is a flowchart of performing protection switching between an OLT and an RE according to Embodiment 3 of the present invention.
  • FIG. 10 is a schematic diagram of a passive optical network topology of a long-distance optical fiber on both sides of a protection RE according to Embodiment 4 of the present invention.
  • FIG. 11 is a flowchart of performing protection switching between an OLT and an RE according to Embodiment 4 of the present invention.
  • FIG. 12 is a flowchart of obtaining an association relationship between an RE and an ONU according to Embodiment 5 of the present invention.
  • FIG. 13 is a schematic diagram of an apparatus for topology construction in a passive optical network according to Embodiment 6 of the present invention.
  • FIG. 14 is a schematic diagram of an apparatus for topology construction in a passive optical network according to Embodiment 7 of the present invention.
  • FIG. 3 is a flowchart of a method for constructing a passive optical network topology on a side of a distance expansion box according to an embodiment of the present invention. As shown in FIG. 3, the method includes:
  • Step 11 The distance extension box reports one or more of the following information to the optical line terminal:
  • the distance expansion box identification information
  • Uplink data is received in an uplink bandwidth corresponding to a bandwidth allocation carried by a downlink frame corresponding to the specified superframe counter value
  • Step 12 The optical line terminal receives the information reported by the extension box, and constructs a passive optical network topology according to the information.
  • step 11 it may also include:
  • the RE determines an optical network unit associated with the RE.
  • the RE may determine the ONU associated with the RE in two ways:
  • Method 1 the RE listens to the uplink frame to obtain the ONU identifier information of the ONU connected to the RE.
  • Method 2 The RE listens to the ranging request sent by the OLT to the ONU, where the ranging request carries the ONU identification information of the ONU that needs to be ranging, and the ranging request also carries the uplink bandwidth of the sending registration message allocated to the ONU; If the RE receives the uplink data of the ONU in the uplink bandwidth corresponding to the ranging request, the RE records the ONU identifier (ONU-ID) information carried in the ranging request.
  • ONU-ID ONU identifier
  • the RE obtains the ONU identifier information of all the ONUs connected to the RE by the foregoing method, and the RE manages the identifier of the RE and the ONU identifier information connected to the RE through physical layer operations.
  • the message (POLO, Physical Layer Operations, Administration and Maintenance) or the ONU Management and Control Interface (OMCI) message is reported to the OLT.
  • the RE responds to the OLT registration, and the OLT allocates the RE identifier to the RE, and the RE listens to the uplink frame, obtains the ONU information connected to the RE, and reports it to the OLT.
  • the RE switch fiber completes the protection switchover, it reports to the OLT the following information: Switch the associated ONU.
  • the RE can also report the following information of the OLT: the RE identifier, the serial number of the working channel to be switched. After receiving the above information, the OLT updates the ranging result of the associated ONU.
  • the method of the embodiment of the present invention can protect the optical fiber in the system without adding redundant equipment in the long-distance PON system, and the OLT can only update the ranging result of the ONU under the RE that switches the optical fiber, thereby saving The protection switching time is improved, and the information transmission efficiency of the PON system is improved.
  • the redundancy protection device can be implemented in the system to reduce the protection cost of the system.
  • the distance extension box (RE) needs to be added in the PON system, as shown in Figure 2. Since the fiber distance between the OLT and the RE is long, the fiber needs to be protected, and the redundant fiber between the OLT and the RE needs to be added in the system, as shown in FIG. 4 .
  • An optical switch is placed at the OLT, and the OLT can be connected to the main channel 1 through an optical switch, or can be connected to the alternate channel 1 through an optical switch.
  • An optical switch is placed at the RE, and the RE can be connected to the main channel 1 through the optical switch, or can be connected to the alternate channel 1 through the optical switch.
  • Step 101 When the RE accesses the PON system, the RE sends the information in response to the registration request sent by the OLT, and the OLT that sends the information through the above information is the RE.
  • the OLT assigns the RE identity identification information to the RE.
  • Step 102 The RE does not detect the downlink signal or the downlink light, and the RE switches from the working channel 1 to the standby channel 1.
  • Step 103 The OLT does not detect the uplink light or the uplink signal, and switches from the working channel 1 to the work. Make channel 2.
  • Step 104 After the RE is switched, the OLT reports the following information: the identity information of the RE; and completes the switch from the working channel 1 to the standby channel 1.
  • Step 105 The RE listens to the uplink frame sent by the ONU, reads the identifier information of the ONU, and sends the identifier information of the ONU to the OLT.
  • Step 106 After receiving the identifier information of the ONU managed by the RE sent by the RE, the OLT adjusts the ranging result of all the ONUs connected to the RE.
  • step 105 the RE listens to the uplink frame sent by the ONU, reads the identifier information of the ONU, and obtains the ONU information associated with the ONU, which can also be accomplished by the following method:
  • the RE listens to the ranging request sent by the OLT to the ONU, where the ranging request carries the ONU identification information of the ONU that needs to be ranging, and the ranging request also carries the uplink bandwidth of the sending registration message allocated to the ONU;
  • the uplink data of the ONU is received in the uplink bandwidth corresponding to the ranging request, and the RE records the ONU identifier (ONU-ID) information carried in the ranging request.
  • the RE obtains the ONU identifier information of all the ONUs connected to the RE by the foregoing method, and the RE passes the identifier of the RE and the ONU identifier information connected to the RE through the physical layer operation management maintenance message (PLOAM message) or the ONU management control interface.
  • PLOAM message physical layer operation management maintenance message
  • the message (OMCI message) is reported to the OLT.
  • the RE when the RE accesses the PON system, the RE sends the information in response to the registration request sent by the OLT, and the identifier information of the RE may be carried in the foregoing information.
  • the distance expansion box needs to be added in the PON system, as shown in Figure 2.
  • the distance between the RE and the optical fiber between the optical splitters is long, the optical fiber needs to be protected, and the redundant optical fiber between the RE and the optical splitter needs to be added in the system, as shown in FIG. 6, FIG. 7 and FIG.
  • An optical switch is placed at the RE, and the RE can be connected to the main channel 2 through the optical switch, or can be connected to the alternate channel 2 through the optical switch.
  • the fiber of the primary channel 2 between the RE1 and the optical splitter fails, the following major steps are taken between the OLT and the RE1 to complete the protection switching. As shown in Figure 9, the following steps are included:
  • Step 201 When RE1 accesses the PON system, the RE1 sends a message in response to the registration request sent by the OLT, and the OLT is notified by the above information that the information is RE1.
  • the OLT gives the RE1 points With the identity information of RE1.
  • Step 202 The RE1 listens to the uplink frame sent by the ONU, and reads the identifier information of the ONU. RE1 stores the ONU identification information of all ONUs connected to RE1.
  • RE1 can detect the downlink or downlink signal, and cannot detect the uplink or uplink signal, and RE1 switches from the working channel 2 to the standby channel 2.
  • Step 204 After the RE1 is switched, the OLT is reported as follows: the ONU identification information of all the ONUs connected to the RE1. Further, the RE1 may also report the identity information of the RE1 and the RE1 is switched from the working channel 2 to the standby channel 2.
  • Step 205 After the OLT receives the message sent by the RE1 in step 204, the OLT measures an ONU connected to the ONU, and obtains an equalization delay difference that needs to be adjusted by the ONU, and the OLT sends the equalization delay difference to the OLT. All ONUs connected under RE1.
  • the method in step 203 may also detect that the downlink signal or the downlink light is detected by the RE1, and the uplink signal or the uplink optical power is not detected, and the RE1 parses the bandwidth allocation field in the downlink frame, if the downlink frame is allocated to the downlink frame.
  • the uplink bandwidth of the ONU connected to the RE1 does not detect the uplink optical signal or the uplink optical power in the time corresponding to the uplink bandwidth, and RE1 switches from the working channel 2 to the standby channel 2.
  • the step 201 may also adopt the following method: when the RE accesses the PON system, the RE sends the information to the registration request sent by the OLT, and carries the identity information of the RE in the foregoing information.
  • the RE1 reports the ONU identification information of all the ONUs connected to the RE1 to the OLT, and the OLT can obtain the optical fiber of the ONU only from the OLT after the protection switching.
  • the distance changes that is, the above ONU needs to re-range and update the equalization delay.
  • the OLT can obtain the loop delay of the ONU on the new working channel by performing ranging only for one ONU, and the OLT uses the loop delay of the ONU on the original channel to reduce the loop delay of the new channel, thereby obtaining
  • the ONU needs to update the equalization delay difference. All the ONUs connected under the RE have experienced the same working channel change, so all the ONUs connected to the RE need to update the equalization delay difference.
  • the OLT sends the equalization delay difference to the location connected to the RE. With ONUs, all of the above ONUs perform equalization delay updates. The ONU after the equalization delay update and other ONUs in the system can achieve uplink synchronization.
  • the OLT obtains the equalization delay difference that all other ONUs under the RE need to update by measuring the next ONU of the RE, without changing other connected ONUs in the system, thereby speeding up the protection switching speed and reducing the protection switching. After the ONU re-ranges the impact on the system business.
  • the OLT can also switch from the working channel 2 to the standby channel 2 through the RE report, and calculate the change of the ONU loop delay caused by the difference ⁇ L of the fiber lengths of the two channels, which is equal to ⁇ L/C/n, where C is the speed of light. And n is the refractive index of the optical wavelength of the bearer signal in the optical fiber, thereby calculating the equalization delay value that needs to be adjusted for all ONUs connected to the RE, and the step of ranging the OLT to an ONU can be omitted, thereby further reducing the protection switching. time.
  • the distance expansion box needs to be added in the PON system, as shown in Figure 2.
  • the fiber length between the RE and the optical splitter is long between the OLT and the RE, the two optical fibers need to be protected, and the redundant optical fibers of the two optical fibers are required in the system, as shown in FIG.
  • Two optical switches are placed at the RE, RE can be connected to the main channel 1 through the optical switch 1, or can be switched to the alternate channel 1 through the optical switch 1; the RE can be connected to the main channel 2 through the optical switch 2, or The connection to the alternate channel 2 is switched by the optical switch 2.
  • the fiber of the primary channel 1 and/or the primary channel 2 fails, the following main steps are taken between the OLT and the RE to complete the protection switching.
  • Step 301 When the RE accesses the PON system, the RE sends the information in response to the registration request sent by the OLT, and the OLT that sends the information through the foregoing information is the RE.
  • the OLT assigns the RE identity identification information to the RE.
  • Step 302 The RE does not detect the downlink frame, and the RE switches from the working channel 1 to the standby channel 1.
  • Step 303 After the channel is switched, the RE detects the downlink signal, and reports the following information of the OLT: RE Identity information; complete switching from working channel 1 to alternate channel 1.
  • Step 304 After the RE is switched from the working channel 1 to the standby channel 1, the uplink signal cannot be detected, and the RE is switched from the working channel 2 to the standby channel 2.
  • Step 305 After the RE is switched, the OLT reports the following information: the identity information of the RE; and completes the switch from the working channel 2 to the standby channel 2.
  • Step 306 The RE listens to the uplink frame sent by the ONU, reads the identifier information of the ONU, and sends the identifier information of the ONU to the OLT.
  • Step 307 After receiving the message sent by the RE, the OLT adjusts the ranging result of all the ONUs connected to the RE.
  • step 303 may also adopt the following method: after the RE is switched from the working channel 1 to the standby channel 1, the uplink signal cannot be detected, and the RE parses the bandwidth allocation field in the downlink frame, if the downlink frame is allocated to the RE.
  • the uplink bandwidth of the connected ONU does not detect the uplink optical signal or the uplink optical power in the time corresponding to the uplink bandwidth, and the RE switches from the working channel 2 to the standby channel 2.
  • the RE when the RE accesses the PON system, the RE sends the information in response to the registration request sent by the OLT, and the identifier information of the RE may be carried in the foregoing information.
  • Step 401 The OLT allocates an uplink bandwidth for ONU and/or RE registration.
  • Step 402 The RE sends a message in the uplink bandwidth to respond to the bandwidth allocation of the OLT in step 401, where the message carries the RE identification information.
  • Step 403 The OLT allocates only one uplink bandwidth to one ONU in a downlink frame, and the downlink frame carries a superframe counter value.
  • Step 404 After the OLT allocates the uplink bandwidth, the OLT allocates an uplink bandwidth to all the REs in the PON system, and uses the RE to report whether the uplink frame is received in the uplink bandwidth allocated to the ONU.
  • Step 405 After receiving the bandwidth allocation allocated by the OLT to the ONU in the step 403, the RE monitors whether the uplink frame is received in the uplink bandwidth. If the uplink frame is received, the RE extracts the superframe carried in the superframe counter in the downlink frame. The value of the counter, and the OLT reports the following information to the OLT in the upstream bandwidth allocated to itself in step 404: the identification information of the RE and the value of the superframe counter.
  • Step 406 The OLT determines, according to the message sent by the RE in step 405, that the ONU is connected under the RE.
  • step 405 can also be replaced by the following steps:
  • the RE local timer is synchronized with the OLT. After the RE receives the bandwidth allocated by the OLT to the ONU in step 403, the RE monitors whether an uplink frame is received in the uplink bandwidth. If an uplink frame is received, the RE records the current local timing. The value of the timestamp corresponding to the device, and reporting the following information to the OLT in the upstream bandwidth allocated by the OLT to itself in step 404: the value of the RE identifier and the timestamp corresponding to the local timer.
  • the OLT allocates only one uplink bandwidth to one ONU in a downlink frame, and the uplink bandwidth may be the ranging bandwidth of the ONU by the OLT, or may be entered by the OLT after the ONU completes the activation process. A bandwidth allocated to the ONU after the working state.
  • a computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the method of passive optical network topology construction described above.
  • FIG. 13 is a schematic diagram of an apparatus for determining a topology in a passive optical network according to an embodiment of the present invention. As shown in FIG. 13, the apparatus of this embodiment includes:
  • the reporting module 51 is configured to report the following one or more kinds of information to the optical line terminal: identification information of the optical network unit associated with the distance extension box; identification information of the distance extension box; and specifying a superframe counter value
  • the uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the corresponding downlink frame; the uplink data is received at the time corresponding to the local specified timestamp value of the distance extension box; the value of the superframe counter; the distance expansion box local timing The value of the timestamp corresponding to the device.
  • the device may further include:
  • a determining module 52 configured to report the distance to the optical line terminal at the reporting module
  • the optical network unit associated with the distance extension box is determined prior to the identification information of the optical network unit associated with the extension box.
  • the determining module 52 is configured to determine an optical network unit associated with the distance extension box by: listening for an uplink frame sent by the optical network unit, and reading identifier information of the optical network unit. Or listening to the ranging request message sent by the optical line terminal to the optical network unit, where the ranging request message carries the identification information of the optical network unit that needs to be ranging and the sending registration message that is allocated to the optical network unit. An uplink bandwidth; if the distance extension box receives the uplink data of the optical network unit in the uplink bandwidth, the identifier information of the optical network unit carried in the ranging request message is recorded.
  • the reporting module is configured to report the identification information of the distance extension box and the distance extension box to the optical line terminal by using a physical layer operation management maintenance message or an optical network unit management control interface message. Identification information of the associated optical network unit.
  • the device may further include:
  • the switching module 53 is configured to switch from the working channel to the standby channel when at least one of the downlink signal and the uplink signal is not detected;
  • the reporting module 51 is configured to report, to the optical line terminal, identification information of the optical network unit associated with the distance extension box after the switching module switches from the working channel to the standby.
  • the switching module 53 is configured to detect a downlink signal, but when the uplink signal cannot be detected, parse the bandwidth allocation field in the downlink frame, if there is a connection to the distance extension box in the downlink frame.
  • the uplink bandwidth of the optical network unit is switched from the working channel to the standby channel when no uplink signal is detected within the time corresponding to the uplink bandwidth.
  • the switching module 53 is configured to send a handover message to the optical line terminal after switching from the working channel to the standby channel, carrying the following information: the identity identification information of the distance extension box and the completion of the work The information that the channel switches to the alternate channel.
  • the apparatus further includes:
  • a registration module configured to receive a registration request of the optical line terminal, and return a registration response message to the optical line terminal, where the registration response message carries at least one of the following information Species: identification information of the distance extension box, the distance expansion box Port information, whether the distance expansion box is equipped with protection interface information, location information of the distance extension box, port transmission power information of the distance extension box, and passive of the optical line terminal to which the distance expansion box is connected Optical network identification information.
  • the device may further include:
  • the receiving module is configured to receive an uplink bandwidth allocated by the optical line terminal, where the uplink bandwidth is used to report whether an uplink frame is received in an uplink bandwidth allocated to the optical network unit.
  • the device may further include:
  • a processing module configured to: if an uplink frame is received in the uplink bandwidth, extract a value of a superframe counter carried in the downlink frame, or record a value of a timestamp corresponding to the current local timer;
  • the reporting module 51 is configured to report the identifier information of the distance extension box and the value of the superframe counter to the optical line terminal in the uplink bandwidth, or report to the optical line terminal in the uplink bandwidth.
  • Embodiments of the present invention also provide a distance extension box, including the apparatus for topology determination in the above passive optical network.
  • An embodiment of the present invention further provides a device for determining a topology in a passive optical network, including a memory and a processor, where
  • the memory stores the following instructions: reporting one or more of the following information to the optical line terminal: identification information of the optical network unit associated with the distance extension box; identification information of the distance extension box;
  • the uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the downlink frame corresponding to the frame counter value; the uplink data is received at the time corresponding to the local specified timestamp value of the distance extension box; the value of the superframe counter; the distance extension The value of the timestamp corresponding to the box local timer;
  • the processor is configured to execute the instructions stored by the memory.
  • FIG. 14 is a schematic diagram of an apparatus for constructing a topology in a passive optical network according to an embodiment of the present invention. As shown in FIG. 14, the apparatus of this embodiment includes:
  • the receiving module 61 is configured to receive, by the distance extension box, one or more kinds of information: identifier information of the optical network unit associated with the distance extension box, and identifier information of the distance extension box, where the superframe counter value is specified.
  • the uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the corresponding downlink frame, and the uplink data, the value of the superframe counter, and the local time of the distance extension box are received at the time corresponding to the local timestamp value specified by the distance extension box.
  • the value of the timestamp corresponding to the device
  • a building block 62 is arranged to construct a passive optical network topology based on the information.
  • the device may further include:
  • a registration module configured to send a registration request to the distance extension box when the distance extension box accesses the passive optical network
  • an allocation module configured to assign identity information to the distance extension box.
  • the allocating module may be further configured to allocate only one uplink bandwidth to one optical network unit in one downlink frame, where the downlink frame carries a superframe counter value; and the passive optical network system is provided. All of the distance extension boxes are respectively allocated an uplink bandwidth for reporting whether the uplink frame is received within the uplink bandwidth allocated to the optical network unit.
  • the device may further include:
  • an adjustment module configured to adjust a ranging result of the optical network unit connected to the distance expansion box, including: measuring an optical network unit connected to the distance expansion box, and obtaining a required optical network unit by ranging Adjusting the equalization delay difference; sending the equalization delay difference to all optical network units connected to the distance extension box, or receiving a handover message of the distance extension box, where the handover message carries the following information: Determining the identity information of the distance extension box and completing the information for switching from the working channel to the backup channel, and determining, according to the difference between the fiber lengths of the working channel and the backup channel, all the optical network units connected under the distance expansion box The equalization delay value to be adjusted is sent to all optical network units connected to the distance extension box.
  • An embodiment of the present invention further provides an optical line terminal, including the apparatus for topology construction in the passive optical network of Embodiment 7.
  • Embodiments of the present invention also provide a device for topology construction in a passive optical network, including a memory and Processor, where
  • the memory stores the following instructions: the receiving distance extension box reports one or more of the following information: identification information of the optical network unit associated with the distance extension box, and the identification information of the distance extension box is specified in the super
  • the uplink data is received in the uplink bandwidth corresponding to the bandwidth allocation carried by the downlink frame corresponding to the frame counter value, and the uplink data, the value of the superframe counter, and the distance extension are received at the time corresponding to the local specified timestamp value of the distance extension box. a value of a timestamp corresponding to the box local timer; constructing a passive optical network topology according to the information;
  • the processor is configured to execute an instruction stored by the memory.
  • the optical fiber in the system can be protected by adding the redundant device to the long-distance PON system, and the OLT can only update the ranging result of the ONU under the RE that switches the optical fiber, thereby saving protection switching. Time, improve the information transmission efficiency of the PON system, and increase the protection cost for the optical fiber by reducing the redundant equipment in the system.

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Abstract

一种无源光网络中拓扑确定的方法，包括：距离扩展盒向光线路终端汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息；所述距离扩展盒的标识信息；在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；超帧计数器的值；所述距离扩展盒本地计时器对应的时间戳的值。

Description

一种无源光网络中拓扑确定、构建的方法及装置 技术领域
本申请涉及但不限于通信领域，尤指一种无源光网络(Passive Optical Network，简称PON)中拓扑确定、构建的方法及装置，距离扩展盒和光线路终端(OLT)。
背景技术
随着网络技术的发展，可以利用网络传输大量的语音、数据、视频等业务，现在又出现了虚拟视频等新业务，因此对带宽的要求不断提高，40G速率的无源光网络(PON)就是在这种需求下产生的。
PON系统的拓扑结构如图1所示，PON系统通常由局侧的光线路终端(OLT)、用户侧的光网络单元(ONU)和光分配网络(ODN)组成，通常采用点到多点的网络结构。ODN由单模光纤和光分路器、光连接器等无源光器件组成，为OLT和ONU之间的物理连接提供光传输媒质。当OLT和ONU之间的距离超过20km时，已有PON系统的光功率预算不能满足OLT和ONU正常通信的信号的误码率，需要在PON系统中加入扩展盒放大OLT和ONU发送的信号，在OLT和ODN之间加入扩展盒，如图2所示，加入扩展盒后的PON系统可以支持OLT和ONU距离较远时正常通信。由于OLT到距离扩展盒(reache extender，简称RE)之间的光纤长度较长，这段光纤容易发生故障，因此需要考虑这段光纤的保护。PON系统由于是靠近用户的系统，因此对价格非常敏感，希望PON系统具有经济性，尽量减少冗余设备，降低PON系统成本。在仅考虑保护光纤而不增加系统中冗余的OLT和RE的情况下，OLT和RE如何实现保护倒换，目前没有解决的方法。除此之外，当PON系统中包含多个RE时，为了故障定位和管理，OLT需要知道每个RE下连接的哪些ONU，即OLT需要知道整个PON系统的拓扑结构，目前没有解决的方法。
发明概述
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供一种无源光网络中拓扑确定、构建的方法及装置，距离扩展盒和光线路终端，以实现具有距离扩展盒的无源光网络拓扑的构建。
一种无源光网络中拓扑确定的方法，包括：
距离扩展盒向光线路终端汇报以下的一种或者多种信息：
与所述距离扩展盒关联的光网络单元的标识信息；
所述距离扩展盒的标识信息；
在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；
在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；
超帧计数器的值；
所述距离扩展盒本地计时器对应的时间戳的值。
在一实施方式中，所述距离扩展盒向所述光线路终端汇报与所述距离扩展盒关联的光网络单元的标识信息之前，还包括：
所述距离扩展盒确定与所述距离扩展盒关联的光网络单元。
在一实施方式中，所述距离扩展盒通过以下方式确定与所述距离扩展盒关联的光网络单元：
所述距离扩展盒侦听光网络单元发送的上行帧，读取所述光网络单元的标识信息；或者
所述距离扩展盒侦听所述光线路终端发送给光网络单元的测距请求消息，所述测距请求消息携带需要测距的光网络单元的标识信息和给所述光网络单元分配的发送注册消息的上行带宽；如果所述距离扩展盒在所述上行带宽内收到光网络单元的上行数据，则记录下所述测距请求消息中携带的光网络单元的标识信息。
在一实施方式中，所述距离扩展盒通过物理层操作管理维护消息或者光 网络单元管理控制接口消息向所述光线路终端汇报所述距离扩展盒的标识信息及与所述距离扩展盒关联的光网络单元的标识信息。
在一实施方式中，所述距离扩展盒在检测不到下行信号和上行信号中的至少之一，从工作通道切换到备用通道时，向所述光线路终端汇报与所述距离扩展盒关联的光网络单元的标识信息。
在一实施方式中，所述距离扩展盒检测不到下行信号和上行信号中的至少之一，从工作通道切换到备用通道，包括：
所述距离扩展盒能检测到下行信号，但不能检测到上行信号时，解析下行帧中的带宽分配域，如果下行帧中有分配给所述距离扩展盒连接的光网络单元的上行带宽，在该上行带宽对应的时间内检测不到上行信号，则从工作通道切换到备用通道。
在一实施方式中，所述距离扩展盒从工作通道切换到备用通道后还包括：
所述距离扩展盒向所述光线路终端发送切换消息，携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息。
在一实施方式中，距离扩展盒向光线路终端汇报信息之前，还包括：
所述距离扩展盒接入所述无源光网络时，接收所述光线路终端的注册请求，并向所述光线路终端返回注册响应消息，
所述注册响应消息携带至少下述信息中的一种：所述距离扩展盒的标识信息，所述距离扩展盒的端口信息，所述距离扩展盒是否配备保护接口信息，所述距离扩展盒的位置信息，所述距离扩展盒的端口发射功率信息，所述距离扩展盒连接到的所述光线路终端的无源光网络标识信息。
在一实施方式中，所述距离扩展盒向所述光线路终端返回注册响应消息之后，还包括：
所述距离扩展盒接收所述光线路终端分配的上行带宽，所述上行带宽用于汇报是否在给光网络单元分配的上行带宽内收到上行帧。
在一实施方式中，所述距离扩展盒接收所述光线路终端分配的上行带宽之后，还包括：
如果所述距离扩展盒在所述上行带宽内收到上行帧，则提取所述下行帧中携带的超帧计数器的值或者记录当前本地计时器对应的时间戳的值，然后在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述超帧计数器的值；或者在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述距离扩展盒本地计时器对应的时间戳的值。
一种无源光网络中拓扑确定的装置，设置于距离扩展盒中，包括：
汇报模块，设置为向光线路终端汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息；所述距离扩展盒的标识信息；在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；超帧计数器的值；所述距离扩展盒本地计时器对应的时间戳的值。
在一实施方式中，所述装置还包括：
确定模块，设置为在所述汇报模块向所述光线路终端汇报与所述距离扩展盒关联的光网络单元的标识信息之前，确定与所述距离扩展盒关联的光网络单元。
在一实施方式中，所述确定模块，设置为通过以下方式确定与所述距离扩展盒关联的光网络单元：侦听光网络单元发送的上行帧，读取所述光网络单元的标识信息；或者侦听所述光线路终端发送给光网络单元的测距请求消息，所述测距请求消息携带需要测距的光网络单元的标识信息和给所述光网络单元分配的发送注册消息的上行带宽；如果所述距离扩展盒在所述上行带宽内收到光网络单元的上行数据，则记录下所述测距请求消息中携带的光网络单元的标识信息。
在一实施方式中，所述汇报模块，设置为通过物理层操作管理维护消息或者光网络单元管理控制接口消息向所述光线路终端汇报所述距离扩展盒的标识信息及与所述距离扩展盒关联的光网络单元的标识信息。
在一实施方式中，所述装置还包括：
切换模块，设置为在检测不到下行信号和上行信号中的至少之一时，从工作通道切换到备用通道；
所述汇报模块，设置为在所述切换模块从工作通道切换到备后向所述光线路终端汇报与所述距离扩展盒关联的光网络单元的标识信息。
在一实施方式中，所述切换模块，设置为能检测到下行信号，但不能检测到上行信号时，解析下行帧中的带宽分配域，如果下行帧中有分配给所述距离扩展盒连接的光网络单元的上行带宽，在该上行带宽对应的时间内检测不到上行信号，则从工作通道切换到备用通道。
在一实施方式中，所述切换模块，还设置为从工作通道切换到备用通道后，向所述光线路终端发送切换消息，携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息。
在一实施方式中，所述装置还包括：
注册模块，设置为接入所述无源光网络时，接收所述光线路终端的注册请求，并向所述光线路终端返回注册响应消息，所述注册响应消息携带至少下述信息中的一种：所述距离扩展盒的标识信息，所述距离扩展盒的端口信息，所述距离扩展盒是否配备保护接口信息，所述距离扩展盒的位置信息，所述距离扩展盒的端口发射功率信息，所述距离扩展盒连接到的所述光线路终端的无源光网络标识信息。
在一实施方式中，所述装置还包括：
接收模块，设置为接收所述光线路终端分配的上行带宽，所述上行带宽用于汇报是否在给光网络单元分配的上行带宽内收到上行帧。
在一实施方式中，所述装置还包括：
处理模块，设置为如果在所述上行带宽内收到上行帧，则提取所述下行帧中携带的超帧计数器的值，或者记录当前本地计时器对应的时间戳的值；
所述汇报模块，设置为在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述超帧计数器的值；或者在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述距离扩展盒本地计 时器对应的时间戳的值。
一种距离扩展盒，包括所述的无源光网络中拓扑确定的装置。
一种无源光网络中拓扑确定的装置，包括存储器和处理器，其中，
所述存储器，存储有以下指令：向光线路终端汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息；所述距离扩展盒的标识信息；在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；超帧计数器的值；所述距离扩展盒本地计时器对应的时间戳的值；
所述处理器，设置为执行所述存储器存储的所述指令。
一种无源光网络中拓扑构建的方法，包括：
光线路终端接收距离扩展盒汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息，所述距离扩展盒的标识信息，在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据，在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据，超帧计数器的值，所述距离扩展盒本地计时器对应的时间戳的值；
所述光线路终端根据所述信息构建无源光网络拓扑。
在一实施方式中，所述光线路终端接收距离扩展盒汇报的信息之前，还包括：
所述光线路终端在所述距离扩展盒接入所述无源光网络时，向所述距离扩展盒发送注册请求，并向所述距离扩展盒分配身份标识信息。
在一实施方式中，所述光线路终端接收距离扩展盒汇报的信息之前，还包括：
所述光线路终端在一个下行帧内只给一个光网络单元分配一个上行带宽，所述下行帧携带一个超帧计数器值；
所述光线路终端给所述无源光网络系统中所有距离扩展盒分别分配一个上行带宽，用于距离扩展盒汇报是否在给所述光网络单元分配的上行带宽内收到上行帧。
在一实施方式中，所述光线路终端根据所述信息构建无源光网络拓扑结构之后，还包括：
所述光线路终端调整所述距离扩展盒下连接的所述光网络单元的测距结果。
在一实施方式中，所述光线路终端调整所述距离扩展盒下连接的所述光网络单元的测距结果，包括：
所述光线路终端对所述距离扩展盒下连接的一个光网络单元测距，测距获得该光网络单元需要调整的均衡时延差值；
所述光线路终端将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元。
在一实施方式中，所述光线路终端调整所述距离扩展盒下连接的所述光网络单元的测距结果，包括：
所述光线路终端接收所述距离扩展盒的切换消息，所述切换消息携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息；
所述光线路终端根据所述工作通道和所述备用通道的光纤长度的差值确定所述距离扩展盒下连接的所有光网络单元需调整的均衡时延值，将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元。
一种无源光网络中拓扑构建的装置，包括：
接收模块，设置为接收距离扩展盒汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息，所述距离扩展盒的标识信息，在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据，在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据，超帧计数器的值，所述距离扩展盒本地计时器对应的时间戳的值；
构建模块，根据所述信息构建无源光网络拓扑结构。
在一实施方式中，所述装置还包括：
注册模块，设置为在所述距离扩展盒接入所述无源光网络时，向所述距 离扩展盒发送注册请求；
分配模块，设置为向所述距离扩展盒分配身份标识信息。
在一实施方式中，所述分配模块，还设置为在一个下行帧内只给一个光网络单元分配一个上行带宽，所述下行帧携带一个超帧计数器值；给所述无源光网络系统中所有距离扩展盒分别分配一个上行带宽，用于距离扩展盒汇报是否在给所述光网络单元分配的上行带宽内收到上行帧。
在一实施方式中，所述装置还包括：
调整模块，设置为调整所述距离扩展盒下连接的所述光网络单元的测距结果，包括：对所述距离扩展盒下连接的一个光网络单元测距，测距获得该光网络单元需要调整的均衡时延差值；将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元，或者接收所述距离扩展盒的切换消息，所述切换消息携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息，根据所述工作通道和所述备用通道的光纤长度的差值确定所述距离扩展盒下连接的所有光网络单元需调整的均衡时延值，将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元。
一种光线路终端，包括上述无源光网络中拓扑构建的装置。
一种无源光网络中拓扑构建的装置，包括存储器和处理器，其中，
所述存储器，存储有以下指令：接收距离扩展盒汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息，所述距离扩展盒的标识信息，在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据，在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据，超帧计数器的值，所述距离扩展盒本地计时器对应的时间戳的值；根据所述信息构建无源光网络拓扑结构；
所述处理器，设置为执行所述存储器存储的指令。
综上，本发明实施例提供一种无源光网络中拓扑确定、构建的方法及装置，距离扩展盒和光线路终端，可以实现具有距离扩展盒的无源光网络拓扑的确定和构建。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1是无源光网络的拓扑图。
图2是长距无源光网络的拓扑图。
图3为本发明实施例的距离扩展盒侧的一种无源光网络拓扑构建的方法的流程图。
图4是本发明实施例二的保护OLT与RE之间的光纤的无源光网络拓扑图。
图5为本发明实施例二的OLT和RE之间完成保护倒换的流程图。
图6是本发明实施例场景1的保护RE与分光器之间的光纤的无源光网络拓扑图；
图7是本发明实施例场景2的保护RE与分光器之间的光纤的无源光网络拓扑图；
图8是本发明实施例场景3的保护包含多个RE系统中RE与分光器之间的光纤的无源光网络拓扑图；
图9为本发明实施例三的OLT和RE之间完成保护倒换的流程图。
图10是本发明实施例四的保护RE两侧的长距离光纤的无源光网络拓扑图。
图11为本发明实施例四的OLT和RE之间完成保护倒换的流程图。
图12为本发明实施例五的获取RE和ONU之间关联关系的流程图。
图13为本发明实施例六的一种无源光网络中拓扑构建的装置的示意图。
图14为本发明实施例七的一种无源光网络中拓扑构建的装置的示意图。
详述
下文中将结合附图对本发明的实施例进行详细说明。
实施例一
图3为本发明实施例的距离扩展盒侧的一种无源光网络拓扑构建的方法的流程图，如图3所示，包括：
步骤11、距离扩展盒向光线路终端汇报以下的一种或者多种信息：
与所述距离扩展盒关联的光网络单元的标识信息；
所述距离扩展盒的标识信息；
在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；
在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；
超帧计数器的值；
所述距离扩展盒本地计时器对应的时间戳的值；
步骤12、光线路终端接收距离扩展盒汇报的信息，根据所述信息构建无源光网络拓扑结构。
通过本发明实施例的方法可以实现带有距离扩展盒的无源光网络拓扑的构建。
步骤11之前，还可以包括：
所述RE确定与所述RE关联的光网络单元。
所述RE可以通过以下两种方式确定与所述RE关联的ONU：
方法1，RE侦听上行帧获取连接到该RE的ONU的ONU标识信息
方法2：RE侦听OLT发送给ONU的测距请求，该测距请求中携带需要测距的ONU的ONU标识信息，该测距请求中也携带给该ONU分配的发送注册消息的上行带宽；如果RE在上述测距请求对应的上行带宽内收到ONU的上行数据，RE记录下上述测距请求中携带的ONU标识(ONU-ID)信息。
RE通过上述方法获得连接在本RE下的所有ONU的ONU标识信息，RE将本RE的标识和连接到本RE上的ONU标识信息通过物理层操作管理 维护(PLOAM，Physical Layer Operations,Administration and Maintenance)消息或者ONU管理控制接口(OMCI，ONU Management and Control Interface)消息汇报给OLT。
本实施例中，RE响应OLT注册，OLT分配RE标识给RE，RE监听上行帧，获取连接到该RE下的ONU信息，并汇报给OLT。RE切换光纤完成保护倒换后，汇报给OLT如下信息：切换关联的ONU。RE也可以汇报OLT如下信息：RE标识，切换的工作通道序号。OLT收到上述信息后更新上述关联的ONU的测距结果。
采用本发明实施例的方法，长距PON系统中不增加冗余设备的情况下，可以保护系统中的光纤，并且OLT仅对切换了光纤的RE下的ONU的测距结果进行更新，可以节省保护倒换时间，提高PON系统信息传输效率，系统中不增加冗余设备可以实现针对光纤的保护倒换降低了系统的保护成本。
实施例二
当OLT需要管理的ONU覆盖的范围较广，PON系统中需要加入距离扩展盒(RE)，如图2所示。由于OLT到RE之间的光纤距离较长，这段光纤需要保护，系统中需要增加OLT到RE之间的冗余光纤，如图4所示。OLT处放置了一个光开关，OLT可以通过光开关连接到主用通道1，也可以通过光开关切换连接到备用通道1。RE处放置了一个光开关，RE可以通过光开关连接到主用通道1，也可以通过光开关切换连接到备用通道1。当OLT到RE之间的主用通道1的光纤出现故障时，OLT和RE之间采用下面的主要步骤完成保护倒换，如图5所示，包括以下步骤：
步骤101、在RE接入PON系统时，RE发送信息响应OLT发送的注册请求，通过上述信息通知OLT发送该信息的是RE。OLT给所述RE分配RE的身份标识信息。
步骤102、RE检测不到下行信号或者下行光，RE从工作通道1切换到备用通道1。
步骤103、OLT检测不到上行光或者上行信号，从工作通道1切换到工 作通道2。
步骤104、RE切换后，报告OLT如下信息：RE的身份标识信息；完成从工作通道1切换到备用通道1。
步骤105、RE侦听ONU发送的上行帧，读取ONU的标识信息，并将ONU的标识信息发送给OLT。
步骤106、OLT收到RE发送的该RE管理的ONU的标识信息后，OLT调整该RE下连接的所有ONU的测距结果。
步骤105中，RE侦听ONU发送的上行帧，读取ONU的标识信息，获得与自己关联的ONU信息，也可以通过下面方法完成：
RE侦听OLT发送给ONU的测距请求，该测距请求中携带需要测距的ONU的ONU标识信息，该测距请求中也携带给该ONU分配的发送注册消息的上行带宽；如果RE在上述测距请求对应的上行带宽内收到ONU的上行数据，RE记录下上述测距请求中携带的ONU标识(ONU-ID)信息。RE通过上述方法获得连接在本RE下的所有ONU的ONU标识信息，RE将本RE的标识和连接到本RE上的ONU标识信息通过物理层操作管理维护消息(PLOAM消息)或者ONU管理控制接口消息(OMCI消息)汇报给OLT。
本实施例中，在RE接入PON系统时，RE发送信息响应OLT发送的注册请求，可以在上述信息中携带RE的身份标识信息。
实施例三
当OLT需要管理的ONU覆盖的范围较广，PON系统中需要加入距离扩展盒，如图2所示。当RE距离分光器之间的光纤距离较长，这段光纤需要保护，系统中需要增加RE到分光器之间的冗余光纤，如图6、图7和图8所示。RE处放置了一个光开关，RE可以通过光开关连接到主用通道2，也可以通过光开关切换连接到备用通道2。当RE1与分光器之间的主用通道2的光纤出现故障时，OLT和RE1之间采用下面的主要步骤完成保护倒换，如图9所示，包括以下步骤：
步骤201、在RE1接入PON系统时，RE1发送信息响应OLT发送的注册请求，通过上述信息通知OLT发送该信息的是RE1。OLT给所述RE1分 配RE1的身份标识信息。
步骤202、RE1侦听ONU发送的上行帧，读取ONU的标识信息。RE1存储连接到RE1下的所有ONU的ONU标识信息。
步骤203、RE1能检测到下行或者下行信号，不能检测到上行光或者上行信号，RE1从工作通道2切换到备用通道2。
步骤204、RE1切换后，报告OLT如下信息：连接到RE1下的所有ONU的ONU标识信息，进一步的，RE1也可以同时汇报该RE1的身份信息和RE1从工作通道2切换到备用通道2。
步骤205、OLT收到RE1在步骤204发送的消息后，OLT对RE1下连接的一个ONU测距，测距获得该ONU需要调整的均衡时延差值，OLT将上述均衡时延差值发送给RE1下连接的所有ONU。
本实施例中，步骤203所述的方法也可以为RE1检测到下行信号或者下行光，检测不到上行信号或者上行光功率，RE1解析下行帧中的带宽分配域，如果下行帧中有分配给RE1连接的ONU的上行带宽，在该上行带宽对应的时间内RE1检测不到上行光信号或者上行光功率，RE1从工作通道2切换到备用通道2。
本实施例中，步骤201也可以采用下述方法：在RE接入PON系统时，RE发送信息响应OLT发送的注册请求，在上述信息中携带RE的身份标识信息。
在本发明实施例中，RE1在完成从工作通道2切换到备用通道2后，向OLT汇报RE1下连接的所有ONU的ONU标识信息，OLT可以获得在此保护倒换后只有上述ONU距离OLT的光纤距离发生变化，即上述ONU需要重新测距，更新均衡时延。
OLT可以通过只对一个ONU进行测距，从而获得该ONU在新工作通道上的环路时延，OLT用该ONU在原通道上的环路时延减去新通道的环路时延，从而获得该ONU需要更新的均衡时延差值，在上述RE下连接的所有ONU经历了相同的工作通道变化，所以上述RE下连接的所有ONU需要更新的均衡时延差值相同。OLT将上述均衡时延差值发给该RE下连接的所 有ONU，上述所有ONU进行均衡时延更新。进行均衡时延更新后的ONU和系统中其他ONU可以实现上行同步。通过上述方法，OLT通过对RE下一个ONU测距从而获得该RE下所有其他ONU需要更新的均衡时延差值，而不改变系统中其他连接的ONU，可以加快保护倒换速度，减少由于保护倒换后ONU重新测距对系统业务的影响。
OLT也可以通过RE汇报的从工作通道2切换到备用通道2，计算两个通道的光纤长度的差值ΔL导致的ONU环路时延的变化，等于ΔL/C/n，其中，C为光速，n为承载信号对应的光波长在光纤中的折射率，从而计算上述RE下连接的所有ONU需要调整的均衡时延值，可以省略OLT对一个ONU进行测距的步骤，进一步减少保护倒换的时间。
实施例四
当OLT需要管理的ONU覆盖的范围较广，PON系统中需要加入距离扩展盒，如图2所示。当OLT和RE之间，RE和分光器之间的光纤长度都较长，这两段光纤需要保护，系统中需要这两段光纤的冗余光纤，如图10所示。RE处放置了两个光开关，RE可以通过光开关1连接到主用通道1，也可以通过光开关1切换连接到备用通道1；RE可以通过光开关2连接到主用通道2，也可以通过光开关2切换连接到备用通道2。当主用通道1和/或主用通道2的光纤出现故障时，OLT和RE之间采用下面的主要步骤完成保护倒换。
情况1：工作通道2断开时，同实施例2；
情况2：工作通道1断开时，同实施例1，但是没有步骤103；
情况3：工作通道1和工作通道2都断开时，如图11所示，包括以下步骤：
步骤301、在RE接入PON系统时，RE发送信息响应OLT发送的注册请求，通过上述信息通知OLT发送该信息的是RE。OLT给所述RE分配RE的身份标识信息。
步骤302、RE检测不到下行帧，RE从工作通道1切换到备用通道1。
步骤303、切换通道后RE检测到下行信号，报告OLT如下信息：RE 的身份标识信息；完成从工作通道1切换到备用通道1。
步骤304、RE从工作通道1切换到备用通道1后，不能检测到上行信号，RE从工作通道2切换到备用通道2。
步骤305、RE切换后，报告OLT如下信息：RE的身份标识信息；完成从工作通道2切换到备用通道2。
步骤306、RE侦听ONU发送的上行帧，读取ONU的标识信息，并将ONU的标识信息发送给OLT。
步骤307、OLT收到RE发送的消息后，OLT调整该RE下连接的所有ONU的测距结果。
本实施的方法，步骤303也可以采用下述方法：RE从工作通道1切换到备用通道1后，不能检测到上行信号，RE解析下行帧中的带宽分配域，如果下行帧中有分配给RE连接的ONU的上行带宽，在该上行带宽对应的时间内RE检测不到上行光信号或者上行光功率，RE从工作通道2切换到备用通道2。
本实施例中，在RE接入PON系统时，RE发送信息响应OLT发送的注册请求，可以在上述信息中携带RE的身份标识信息。
实施例五
本实施例中，主要描述OLT和RE之间如何完成RE和ONU之间关联关系的获取，如图12所示，包括以下步骤：
步骤401：OLT分配了一个用于ONU和/或RE注册的上行带宽；
步骤402：RE在上述上行带宽内发送消息响应OLT在步骤401中的带宽分配，该消息中携带了RE标识信息；
步骤403：OLT在一个下行帧内只给一个ONU分配一个上行带宽，该下行帧携带了一个超帧计数器值。
步骤404：OLT分配完上述上行带宽后，OLT给PON系统中所有RE分别分配一个上行带宽，用于RE汇报是否在给上述ONU分配的上行带宽内收到上行帧。
步骤405：RE收到步骤403中OLT分配给ONU的带宽分配后，RE监测在该上行带宽内是否收到上行帧，如果收到上行帧，RE提取上述下行帧中超帧计数器中携带的超帧计数器的值，并在OLT在步骤404中分配给自己的上行带宽内向OLT汇报下述信息：RE的标识信息和超帧计数器的值。
步骤406：OLT根据RE在步骤405中发送的消息，确定所述ONU连接在所述RE下。
上述步骤405也可以替换成下面的步骤：
RE本地的计时器和OLT保持时间同步，RE收到步骤403中OLT分配给ONU的带宽分配后，RE监测在该上行带宽内是否收到上行帧，如果收到上行帧，RE记录当前本地计时器对应的时间戳的值，并在OLT在步骤404中分配给自己的上行带宽内向OLT汇报下述信息：RE标识和本地计时器对应的时间戳的值。
在本实施例中的步骤403，OLT在一个下行帧内只给一个ONU分配一个上行带宽，该上行带宽可以是OLT对该ONU的测距带宽，也可以是OLT在该ONU完成激活流程后进入工作状态后分配给该ONU的一个带宽。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现上述无源光网络拓扑构建的方法。
实施例六
图13为本发明实施例的一种无源光网络中拓扑确定的装置的示意图，如图13所示，本实施例的装置包括：
汇报模块51，设置为向光线路终端汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息；所述距离扩展盒的标识信息；在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；超帧计数器的值；所述距离扩展盒本地计时器对应的时间戳的值。
在一实施例中，所述装置还可以包括：
确定模块52，设置为在所述汇报模块向所述光线路终端汇报与所述距 离扩展盒关联的光网络单元的标识信息之前，确定与所述距离扩展盒关联的光网络单元。
在一实施例中，所述确定模块52，设置为通过以下方式确定与所述距离扩展盒关联的光网络单元：侦听光网络单元发送的上行帧，读取所述光网络单元的标识信息；或者侦听所述光线路终端发送给光网络单元的测距请求消息，所述测距请求消息携带需要测距的光网络单元的标识信息和给所述光网络单元分配的发送注册消息的上行带宽；如果所述距离扩展盒在所述上行带宽内收到光网络单元的上行数据，则记录下所述测距请求消息中携带的光网络单元的标识信息。
在一实施例中，所述汇报模块，设置为通过物理层操作管理维护消息或者光网络单元管理控制接口消息向所述光线路终端汇报所述距离扩展盒的标识信息及与所述距离扩展盒关联的光网络单元的标识信息。
在一实施例中，所述装置还可以包括：
切换模块53，设置为在检测不到下行信号和上行信号中至少之一时，从工作通道切换到备用通道；
所述汇报模块51，设置为在所述切换模块从工作通道切换到备后向所述光线路终端汇报与所述距离扩展盒关联的光网络单元的标识信息。
在一实施例中，所述切换模块53，设置为能检测到下行信号，但不能检测到上行信号时，解析下行帧中的带宽分配域，如果下行帧中有分配给所述距离扩展盒连接的光网络单元的上行带宽，在该上行带宽对应的时间内检测不到上行信号，则从工作通道切换到备用通道。
在一实施例中，所述切换模块53，设置为从工作通道切换到备用通道后，向所述光线路终端发送切换消息，携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息。
在一实施例中，所述装置还包括：
注册模块，设置为接入所述无源光网络时，接收所述光线路终端的注册请求，并向所述光线路终端返回注册响应消息，所述注册响应消息携带至少下述信息中的一种：所述距离扩展盒的标识信息，所述距离扩展盒的 端口信息，所述距离扩展盒是否配备保护接口信息，所述距离扩展盒的位置信息，所述距离扩展盒的端口发射功率信息，所述距离扩展盒连接到的所述光线路终端的无源光网络标识信息。
在一实施例中，所述装置还可以包括：
接收模块，设置为接收所述光线路终端分配的上行带宽，所述上行带宽用于汇报是否在给光网络单元分配的上行带宽内收到上行帧。
在一实施例中，所述装置还可以包括：
处理模块，设置为如果在所述上行带宽内收到上行帧，则提取所述下行帧中携带的超帧计数器的值，或者记录当前本地计时器对应的时间戳的值；
所述汇报模块51，设置为在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述超帧计数器的值；或者在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述距离扩展盒本地计时器对应的时间戳的值。
本发明实施例还提供一种距离扩展盒，包括上述的无源光网络中拓扑确定的装置。
本发明实施例还提供一种无源光网络中拓扑确定的装置，包括存储器和处理器，其中，
所述存储器，存储有以下指令：向光线路终端汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息；所述距离扩展盒的标识信息；在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；超帧计数器的值；所述距离扩展盒本地计时器对应的时间戳的值；
所述处理器，设置为执行所述存储器存储的所述指令。
实施例七
图14为本实施例的一种无源光网络中拓扑构建的装置的示意图，如图14所示，本实施例的装置包括：
接收模块61，设置为接收距离扩展盒汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息，所述距离扩展盒的标识信息，在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据，在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据，超帧计数器的值，所述距离扩展盒本地计时器对应的时间戳的值；
构建模块62，设置为根据所述信息构建无源光网络拓扑结构。
在一实施例中，所述装置还可以包括：
注册模块，设置为在所述距离扩展盒接入所述无源光网络时，向所述距离扩展盒发送注册请求；
分配模块，设置为向所述距离扩展盒分配身份标识信息。
在一实施例中，所述分配模块，还可以设置为在一个下行帧内只给一个光网络单元分配一个上行带宽，所述下行帧携带一个超帧计数器值；给所述无源光网络系统中所有距离扩展盒分别分配一个上行带宽，用于距离扩展盒汇报是否在给所述光网络单元分配的上行带宽内收到上行帧。
在一实施例中，所述装置还可以包括：
调整模块，设置为调整所述距离扩展盒下连接的所述光网络单元的测距结果，包括：对所述距离扩展盒下连接的一个光网络单元测距，测距获得该光网络单元需要调整的均衡时延差值；将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元，或者接收所述距离扩展盒的切换消息，所述切换消息携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息，根据所述工作通道和所述备用通道的光纤长度的差值确定所述距离扩展盒下连接的所有光网络单元需调整的均衡时延值，将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元。
本发明实施例还提供一种光线路终端，包括实施例七的无源光网络中拓扑构建的装置。
本发明实施例还提供一种无源光网络中拓扑构建的装置，包括存储器和 处理器，其中，
所述存储器，存储有以下指令：接收距离扩展盒汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息，所述距离扩展盒的标识信息，在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据，在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据，超帧计数器的值，所述距离扩展盒本地计时器对应的时间戳的值；根据所述信息构建无源光网络拓扑结构；
所述处理器，设置为执行所述存储器存储的指令。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。本发明实施例不限制于任何特定形式的硬件和软件的结合。
以上仅为本发明的实施例，当然，本申请还可有其他多种实施例，在不背离本申请精神及其实质的情况下，熟悉本领域的技术人员当可根据本申请作出各种相应的改变和变形，但这些相应的改变和变形都应属于本申请所附的权利要求的保护范围。
工业实用性
采用本发明实施例，长距PON系统中不增加冗余设备的情况下，可以保护系统中的光纤，并且OLT仅对切换了光纤的RE下的ONU的测距结果进行更新，可以节省保护倒换时间，提高PON系统信息传输效率，系统中不增加冗余设备可以实现针对光纤的保护倒换降低了系统的保护成本。

Claims (34)

  1. 一种无源光网络中拓扑确定的方法，包括：
    距离扩展盒向光线路终端汇报以下的一种或者多种信息：
    与所述距离扩展盒关联的光网络单元的标识信息；
    所述距离扩展盒的标识信息；
    在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；
    在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；
    超帧计数器的值；
    所述距离扩展盒本地计时器对应的时间戳的值。
  2. 如权利要求1所述的方法，其中：所述距离扩展盒向所述光线路终端汇报与所述距离扩展盒关联的光网络单元的标识信息之前，还包括：
    所述距离扩展盒确定与所述距离扩展盒关联的光网络单元。
  3. 如权利要求2所述的方法，其中：所述距离扩展盒通过以下方式确定与所述距离扩展盒关联的光网络单元：
    所述距离扩展盒侦听光网络单元发送的上行帧，读取所述光网络单元的标识信息；或者
    所述距离扩展盒侦听所述光线路终端发送给光网络单元的测距请求消息，所述测距请求消息携带需要测距的光网络单元的标识信息和给所述光网络单元分配的发送注册消息的上行带宽；如果所述距离扩展盒在所述上行带宽内收到光网络单元的上行数据，则记录下所述测距请求消息中携带的光网络单元的标识信息。
  4. 如权利要求1所述的方法，其中：
    所述距离扩展盒通过物理层操作管理维护消息或者光网络单元管理控制接口消息向所述光线路终端汇报所述距离扩展盒的标识信息及与所述距离扩展盒关联的光网络单元的标识信息。
  5. 如权利要求1所述的方法，其中：
    所述距离扩展盒在检测不到下行信号和上行信号中的至少之一，从工作通道切换到备用通道时，向所述光线路终端汇报与所述距离扩展盒关联的光网络单元的标识信息。
  6. 如权利要求5所述的方法，其中：所述距离扩展盒检测不到下行信号和上行信号中的至少之一，从工作通道切换到备用通道，包括：
    所述距离扩展盒能检测到下行信号，但不能检测到上行信号时，解析下行帧中的带宽分配域，如果下行帧中有分配给所述距离扩展盒连接的光网络单元的上行带宽，在该上行带宽对应的时间内检测不到上行信号，则从工作通道切换到备用通道。
  7. 如权利要求5或6所述的方法，其中：所述距离扩展盒从工作通道切换到备用通道后还包括：
    所述距离扩展盒向所述光线路终端发送切换消息，携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息。
  8. 如权利要求1所述的方法，其中：距离扩展盒向光线路终端汇报信息之前，还包括：
    所述距离扩展盒接入所述无源光网络时，接收所述光线路终端的注册请求，并向所述光线路终端返回注册响应消息，
    所述注册响应消息携带至少下述信息中的一种：所述距离扩展盒的标识信息，所述距离扩展盒的端口信息，所述距离扩展盒是否配备保护接口信息，所述距离扩展盒的位置信息，所述距离扩展盒的端口发射功率信息，所述距离扩展盒连接到的所述光线路终端的无源光网络标识信息。
  9. 如权利要求8所述的方法，其中：所述距离扩展盒向所述光线路终端返回注册响应消息之后，还包括：
    所述距离扩展盒接收所述光线路终端分配的上行带宽，所述上行带宽用于汇报是否在给光网络单元分配的上行带宽内收到上行帧。
  10. 如权利要求9所述的方法，其中：所述距离扩展盒接收所述光线路终端分配的上行带宽之后，还包括：
    如果所述距离扩展盒在所述上行带宽内收到上行帧，则提取所述下行 帧中携带的超帧计数器的值或者记录当前本地计时器对应的时间戳的值，然后在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述超帧计数器的值；或者在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述距离扩展盒本地计时器对应的时间戳的值。
  11. 一种无源光网络中拓扑确定的装置，设置于距离扩展盒中，包括：
    汇报模块，设置为向光线路终端汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息；所述距离扩展盒的标识信息；在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；超帧计数器的值；所述距离扩展盒本地计时器对应的时间戳的值。
  12. 如权利要求11所述的装置，所述装置还包括：
    确定模块，设置为在所述汇报模块向所述光线路终端汇报与所述距离扩展盒关联的光网络单元的标识信息之前，确定与所述距离扩展盒关联的光网络单元。
  13. 如权利要求12所述的装置，其中：
    所述确定模块，设置为通过以下方式确定与所述距离扩展盒关联的光网络单元：侦听光网络单元发送的上行帧，读取所述光网络单元的标识信息；或者侦听所述光线路终端发送给光网络单元的测距请求消息，所述测距请求消息携带需要测距的光网络单元的标识信息和给所述光网络单元分配的发送注册消息的上行带宽；如果所述距离扩展盒在所述上行带宽内收到光网络单元的上行数据，则记录下所述测距请求消息中携带的光网络单元的标识信息。
  14. 如权利要求11所述的装置，其中：
    所述汇报模块，设置为通过物理层操作管理维护消息或者光网络单元管理控制接口消息向所述光线路终端汇报所述距离扩展盒的标识信息及与所 述距离扩展盒关联的光网络单元的标识信息。
  15. 如权利要求11所述的装置，所述装置还包括：
    切换模块，设置为在检测不到下行信号和上行信号中的至少之一时，从工作通道切换到备用通道；
    所述汇报模块，设置为在所述切换模块从工作通道切换到备后向所述光线路终端汇报与所述距离扩展盒关联的光网络单元的标识信息。
  16. 如权利要求15所述的装置，其中：
    所述切换模块，设置为能检测到下行信号，但不能检测到上行信号时，解析下行帧中的带宽分配域，如果下行帧中有分配给所述距离扩展盒连接的光网络单元的上行带宽，在该上行带宽对应的时间内检测不到上行信号，则从工作通道切换到备用通道。
  17. 如权利要求15或16所述的装置，其中：
    所述切换模块，还设置为从工作通道切换到备用通道后，向所述光线路终端发送切换消息，携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息。
  18. 如权利要求11-16任一项所述的装置，所述装置还包括：
    注册模块，设置为接入所述无源光网络时，接收所述光线路终端的注册请求，并向所述光线路终端返回注册响应消息，所述注册响应消息携带至少下述信息中的一种：所述距离扩展盒的标识信息，所述距离扩展盒的端口信息，所述距离扩展盒是否配备保护接口信息，所述距离扩展盒的位置信息，所述距离扩展盒的端口发射功率信息，所述距离扩展盒连接到的所述光线路终端的无源光网络标识信息。
  19. 如权利要求18所述的装置，所述装置还包括：
    接收模块，设置为接收所述光线路终端分配的上行带宽，所述上行带宽用于汇报是否在给光网络单元分配的上行带宽内收到上行帧。
  20. 如权利要求19所述的装置，所述装置还包括：
    处理模块，设置为如果在所述上行带宽内收到上行帧，则提取所述下 行帧中携带的超帧计数器的值，或者记录当前本地计时器对应的时间戳的值；
    所述汇报模块，设置为在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述超帧计数器的值；或者在所述上行带宽内向所述光线路终端汇报所述距离扩展盒的标识信息和所述距离扩展盒本地计时器对应的时间戳的值。
  21. 一种距离扩展盒，包括如权利要求11-20任一项所述的无源光网络中拓扑确定的装置。
  22. 一种无源光网络中拓扑确定的装置，包括存储器和处理器，
    所述存储器，存储有以下指令：向光线路终端汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息；所述距离扩展盒的标识信息；在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据；在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据；超帧计数器的值；所述距离扩展盒本地计时器对应的时间戳的值；
    所述处理器，设置为执行所述存储器存储的所述指令。
  23. 一种无源光网络中拓扑构建的方法，包括：
    光线路终端接收距离扩展盒汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息，所述距离扩展盒的标识信息，在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内收到了上行数据，在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据，超帧计数器的值，所述距离扩展盒本地计时器对应的时间戳的值；
    所述光线路终端根据所述信息构建无源光网络拓扑。
  24. 如权利要求23所述的方法，其中：所述光线路终端接收距离扩展盒汇报的信息之前，还包括：
    所述光线路终端在所述距离扩展盒接入所述无源光网络时，向所述距离扩展盒发送注册请求，并向所述距离扩展盒分配身份标识信息。
  25. 如权利要求24所述的方法，其中：所述光线路终端接收距离扩展 盒汇报的信息之前，还包括：
    所述光线路终端在一个下行帧内只给一个光网络单元分配一个上行带宽，所述下行帧携带一个超帧计数器值；
    所述光线路终端给所述无源光网络系统中所有距离扩展盒分别分配一个上行带宽，用于距离扩展盒汇报是否在给所述光网络单元分配的上行带宽内收到上行帧。
  26. 如权利要求23所述的方法，其中：所述光线路终端根据所述信息构建无源光网络拓扑结构之后，还包括：
    所述光线路终端调整所述距离扩展盒下连接的所述光网络单元的测距结果。
  27. 如权利要求26所述的方法，其中：所述光线路终端调整所述距离扩展盒下连接的所述光网络单元的测距结果，包括：
    所述光线路终端对所述距离扩展盒下连接的一个光网络单元测距，测距获得该光网络单元需要调整的均衡时延差值；
    所述光线路终端将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元。
  28. 如权利要求26所述的方法，其中：所述光线路终端调整所述距离扩展盒下连接的所述光网络单元的测距结果，包括：
    所述光线路终端接收所述距离扩展盒的切换消息，所述切换消息携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息；
    所述光线路终端根据所述工作通道和所述备用通道的光纤长度的差值确定所述距离扩展盒下连接的所有光网络单元需调整的均衡时延值，将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元。
  29. 一种无源光网络中拓扑构建的装置，包括：
    接收模块，设置为接收距离扩展盒汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息，所述距离扩展盒的标识信息，在指定超帧计数器值对应的下行帧携带的带宽分配对应的上行带宽内 收到了上行数据，在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据，超帧计数器的值，所述距离扩展盒本地计时器对应的时间戳的值；
    构建模块，根据所述信息构建无源光网络拓扑结构。
  30. 如权利要求29所述的装置，所述装置还包括：
    注册模块，设置为在所述距离扩展盒接入所述无源光网络时，向所述距离扩展盒发送注册请求；
    分配模块，设置为向所述距离扩展盒分配身份标识信息。
  31. 如权利要求30所述的装置，其中：
    所述分配模块，还设置为在一个下行帧内只给一个光网络单元分配一个上行带宽，所述下行帧携带一个超帧计数器值；给所述无源光网络系统中所有距离扩展盒分别分配一个上行带宽，用于距离扩展盒汇报是否在给所述光网络单元分配的上行带宽内收到上行帧。
  32. 如权利要求30所述的装置，所述装置还包括：
    调整模块，设置为调整所述距离扩展盒下连接的所述光网络单元的测距结果，包括：对所述距离扩展盒下连接的一个光网络单元测距，测距获得该光网络单元需要调整的均衡时延差值；将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元，或者接收所述距离扩展盒的切换消息，所述切换消息携带以下信息：所述距离扩展盒的身份标识信息和完成从工作通道切换到备用通道的信息，根据所述工作通道和所述备用通道的光纤长度的差值确定所述距离扩展盒下连接的所有光网络单元需调整的均衡时延值，将所述均衡时延差值发送给所述距离扩展盒下连接的所有光网络单元。
  33. 一种光线路终端，包括如权利要求29-32任一项所述的装置。
  34. 一种无源光网络中拓扑构建的装置，包括存储器和处理器，
    所述存储器，存储有以下指令：接收距离扩展盒汇报以下的一种或者多种信息：与所述距离扩展盒关联的光网络单元的标识信息，所述距离扩展盒的标识信息，在指定超帧计数器值对应的下行帧携带的带宽分配对应 的上行带宽内收到了上行数据，在所述距离扩展盒本地指定时间戳值对应的时刻收到了上行数据，超帧计数器的值，所述距离扩展盒本地计时器对应的时间戳的值；根据所述信息构建无源光网络拓扑结构；
    所述处理器，设置为执行所述存储器存储的指令。
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