WO2011095022A1 - 一种对发光异常光网络单元正确定位的方法及系统 - Google Patents

一种对发光异常光网络单元正确定位的方法及系统 Download PDF

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Publication number
WO2011095022A1
WO2011095022A1 PCT/CN2010/078724 CN2010078724W WO2011095022A1 WO 2011095022 A1 WO2011095022 A1 WO 2011095022A1 CN 2010078724 W CN2010078724 W CN 2010078724W WO 2011095022 A1 WO2011095022 A1 WO 2011095022A1
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Prior art keywords
onu
olt
encrypted
message
data
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PCT/CN2010/078724
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English (en)
French (fr)
Inventor
张伟良
耿丹
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中兴通讯股份有限公司
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Publication of WO2011095022A1 publication Critical patent/WO2011095022A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

Definitions

  • the present invention relates to the field of passive optical networks (PON), and in particular, to a method and system for correctly locating an abnormal optical network unit (ONU) in a PON system.
  • PON passive optical networks
  • ONU abnormal optical network unit
  • a PON system usually consists of an optical line terminal (OLT) on the central office, an ONU on the user side, and an optical distribution network (ODN).
  • ONT optical line terminal
  • ODN optical distribution network
  • a point-to-multipoint network structure is usually used.
  • the ODN consists of single-mode fiber and passive optical components such as optical splitters and optical connectors.
  • the ODN provides an optical transmission medium for the physical connection between the OLT and the ONU.
  • each ONU receives all the frames, and then according to the ONU identifier (ONU-ID), Gigabit Passive Optical Network Encapsulation Method Port Identification (GEM-Port ID), Allocation-ID (Allocation-ID) to obtain its own frame.
  • ONU-ID ONU identifier
  • GEM-Port ID Gigabit Passive Optical Network Encapsulation Method Port Identification
  • Allocation-ID Allocation-ID
  • For the uplink direction that is, the data transmission from the ONU to the OLT direction, since each ONU needs to share the transmission medium, each ONU should transmit uplink data to the OLT to arrange its own time slot.
  • the downlink frame structure of the GPON (G-PON Transmission Convergence) layer is shown in Figure 1.
  • the downlink frame is composed of a downlink physical control block (PCBd) and a payload, wherein the PCBd is composed of a physical synchronization (Psync, Physical Synchronization) i or an identifier (Ident) i or a PlOAMd domain, and an inter-bit parity block.
  • PCBd Physical synchronization
  • Psync Physical Synchronization
  • Ident identifier
  • PlOAMd domain an inter-bit parity block.
  • BIP Bit Interleaved Parity domain
  • Plend Payload Length downstream domain and upstream bandwidth mapping
  • PlOAMd is the abbreviation of Physical Layer OAM downstream
  • OAM is the abbreviation of Operation, Administraion & Maintenance, which refers to operation, management and maintenance.
  • the US BWmap domain consists of N allocation structures. Any Allocation Structure by Alloc-ID, Allocation Identifier field, Flags field, Band Start Time (StartTime) field, Bandwidth End Time (StopTime) field, and Cyclic Redundancy Check Code (CRC) , Cyclic Redundancy Check) domain composition.
  • Alloc-ID is generally the identifier of the transmission container (T-CONT, Transmission Container);
  • the Flags field is the bandwidth allocation option, 12-bit, bit 11-0, where bit 10 is used to inform the ONU of the upstream bandwidth.
  • the Physical Layer Operations Administration and Maintenance (PLOAM) message is sent, and bit 6-0 is reserved.
  • the OLT uses PLOAM messages to implement partial management functions for the ONU, it includes management functions such as ONU activation, ONU management control channel establishment, encryption configuration, and key management.
  • management functions such as ONU activation, ONU management control channel establishment, encryption configuration, and key management.
  • the ONU receives an Allocation structure, the ONU performs a CRC check on the data in the received Allocation structure. If the verification result is correct, and the ONU judges that the Allocation structure is assigned to itself according to the Alloc-ID, the ONU will be in the The StartTime time indicated by the Allocation structure starts transmitting data in the T-CONT whose bandwidth allocation identifier is Alloc-ID, and stops transmitting data at StopTime.
  • an ONU in the PON system turns on the laser or sends uplink data in the uplink bandwidth corresponding to the Allocation structure of the other ONUs, the two ONUs simultaneously emit or transmit data on the uplink channel, causing the OLT to not parse normally.
  • Received upstream data That is to say, if there is an ONU with abnormal illumination, the ONU that is abnormally illuminated will emit light at the same time as other ONUs, or the ONU that emits an abnormality will occupy the time slot allocated by the OLT to other ONUs to transmit uplink data, thereby causing the OLT to not properly parse the received data.
  • the OLT needs to locate the ONU with abnormal illumination.
  • the solution used by the OLT to locate the abnormal ONU is:
  • the OLT can pass Send each one of the ONUs in the system a name to disable the serial number.
  • Deactivate_ONU-ID deactivate the PLOAM message of the ONU identifier
  • the ONU that emits abnormality emits light or transmits data in the uplink bandwidth allocated by the OLT to other ONUs, and responds to the OLT command normally in the uplink bandwidth allocated by the OLT, or the ONU that emits abnormal light always emits light or transmits data in the entire uplink bandwidth.
  • the main object of the present invention is to provide a method and system for correctly locating an abnormal ONU, which can accurately position the ONU of the illuminating abnormality, so as to avoid the influence of the abnormal ONU caused by the incorrect positioning of the illuminating abnormal ONU.
  • a method for correctly positioning an illuminating abnormal optical network unit comprising:
  • the OLT Before the optical line terminal (OLT) sends the downlink frame including the plaintext information to the optical network unit (ONU), the OLT sends a downlink frame containing the encrypted information to the ONU; or the OLT includes the plaintext information and the encrypted information. Sending to the ONU in the same downlink frame;
  • the OLT implements the correct positioning of the illuminating abnormal ONU by the priority response of the ONU to the received encrypted information.
  • the plaintext information includes: an uplink bandwidth mapping allocated by the OLT to the ONU (US)
  • the encrypted information includes: Encrypted physical layer operation management and maintenance (PLOAM) Interest rate
  • the priority response of the ONU to the encrypted information includes: the ONU performing an operation performed by the OLT to command the ONU according to the content of the encrypted PLOAM message;
  • the content of the encrypted PLOAM message is: satisfying the requirement that the OLT implements determining that the LED is abnormally ONU, and the OLT commands an operation performed by the ONU.
  • the content of the encrypted PLOAM message is: when the OLT commands the ONU not to send data in its own US BWma, the encrypted PLOAM message uses an existing PLOAM message or a newly created PLOAM message, and Encrypting the content portion of the existing PLOAM message or the newly created PLOAM message;
  • the existing PLOAM message includes: a Disable_Serial_Number message, or a Deactivate_ONU-ID message.
  • the ONU turns off its own laser, and does not respond to the US BWmap allocated by the OLT to the ONU itself, so that the ONU does not send data in its own US BWma.
  • the content of the encrypted PLOAM message is: when the OLT commands the ONU to send the agreed data in its US BWma, the encrypted PLOAM message uses only the newly created PLOAM message, and the newly created PLOAM The message content portion of the message is encrypted.
  • the ONU sends the agreed data in its own US BWma.
  • a system for correctly positioning an illuminating abnormal optical network unit comprising: a transmitting unit and a positioning unit; wherein
  • the sending unit is configured to: before the OLT sends the downlink frame that includes the plaintext information to the ONU, the OLT sends a downlink frame that includes the encrypted information to the ONU; or the OLT includes the plaintext information and the encrypted information in the same Sending to the ONU in a downlink frame;
  • the locating unit is configured to perform a priority response of the received encrypted information by using the ONU, so that
  • the OLT realizes the correct positioning of the illuminating abnormal ONU.
  • the plaintext information includes: an US BWmap allocated by the OLT to the ONU; the encrypted information includes: an encrypted PLO AM message;
  • the locating unit further includes: a response module, configured to: when the ONU preferentially responds to the encrypted information, the ONU performs an operation performed by the OLT to the ONU according to the content of the encrypted PLOAM message;
  • the content of the encrypted PLOAM message is: satisfying the need for the OLT to correctly locate the illuminating abnormal ONU, and the OLT commands the operation performed by the ONU.
  • the response module is further configured to: the content of the encrypted PLOAM message is: when the OLT commands the ONU to not send data in its US BWma, the ONU turns off its own laser, and no longer responds.
  • the OLT allocates the US BWmap to the ONU itself, so that the ONU does not send data in its own US BWma.
  • the content of the encrypted PLOAM message is: the 01 ⁇ command 01 ⁇ 1; when the agreed data is sent in its own 1; 8 8 ⁇ 11 ⁇
  • the ONU sends the agreed data in its own US BWma.
  • the OLT Before the OLT of the present invention sends the downlink frame including the plaintext information to the ONU, the OLT sends a downlink frame containing the encrypted information to the ONU; or the OLT includes the plaintext information and the encrypted information in the same downlink frame and sends the message to the ONU; The priority response of the received encrypted information enables the OLT to correctly locate the illuminating abnormal ONU.
  • the downlink frame sent by the OLT includes a special type of downlink frame, and the downlink frame includes the encrypted information.
  • the ONU receives such a downlink frame including the encrypted information, the ONU preferentially responds to the downlink frame through the ONU.
  • the encrypted information in the OLT realizes the correct positioning of the illuminating abnormal ONU.
  • FIG. 1 is a schematic structural diagram of a downlink frame of an existing GPON system
  • the basic idea of the present invention is: The ONU preferentially responds to the encrypted information to achieve correct positioning of the illuminating abnormal ONU by the OLT.
  • a method for correctly locating an abnormal ONU includes the following steps:
  • Step 101 Before the OLT sends the downlink frame including the plaintext information to the ONU, the OLT sends a downlink frame including the encrypted information to the ONU. Alternatively, the OLT sends the plaintext information and the encrypted information in the same downlink frame to the ONU.
  • the OLT Since the OLT can only send one downlink frame at the same time, it cannot transmit two downlink frames at the same time. Therefore, before sending the downlink frame containing the plaintext information, the OLT needs to send the encryption in another downlink frame.
  • the downlink frame of the information; or, the OLT encapsulates the plaintext information and the encrypted information in different parts of the same downlink frame, respectively, to send the plaintext information and the encrypted information to the ONU through the same downlink frame.
  • the plaintext information and/or the encrypted information may be encapsulated in the downlink frame.
  • the ONU preferentially responds only to the downlink frame including the encrypted information.
  • the plaintext information specifically includes: an US BWmap allocated by the OLT to the ONU;
  • the encrypted information specifically includes: an encrypted PLO AM message.
  • Step 102 The OLT implements the correct positioning of the illuminating abnormal ONU by the priority response of the ONU to the received encrypted information.
  • the ONU is superior to the received encrypted information.
  • the first response specifically includes: The ONU performs an operation performed by the OLT to the ONU according to the content of the encrypted PLOAM message.
  • the content of the encrypted PLOAM message is: The OLT is required to implement the operation of the ONU to correctly locate the abnormal ONU.
  • the ONU when the content of the encrypted PLOAM message is different, the ONU performs the operation performed by the ONU according to the different contents of the encrypted PLOAM message, which are respectively described below.
  • the content of the encrypted PLOAM message is specifically as follows: OLT command The ONU does not send data in the US BWma allocated by the OLT for the ONU itself.
  • the encrypted PLOAM message uses the existing PLOAM message or the newly created PLOAM message, and encrypts the message content part of the existing PLOAM message or the newly created PLOAM message.
  • the existing PLOAM message specifically includes: a Disable_Serial_Number message, or a Deactivate_ONU-ID message.
  • the operation performed by the ONU to execute the OLT command includes: turning off the laser of the ONU, and no longer responding to the US BWmap allocated by the OLT to the ONU, so that the ONU does not send data in its US BWma. .
  • the second case The content of the encrypted PLOAM message is specifically as follows: OLT command The ONU sends the agreed data in the US BWma allocated by the OLT for the ONU itself.
  • the encrypted PLOAM message uses only the newly created PLOAM message and encrypts the message content portion of the newly created PLOAM message.
  • the operation performed by the ONU to execute the OLT to the ONU specifically includes: the ONU sends the agreed data in the US BWma allocated by the OLT to the ONU itself.
  • the downlink frame sent by the OLT includes a special type of downlink frame, that is, a downlink frame including the encrypted information, and the ONU preferentially responds to such a downlink frame including the encrypted information, so as to implement OLT illumination. Correct positioning of the abnormal ONU.
  • the invention mainly includes the following contents:
  • the OLT sends the ONU at the same time as or before the OLT sends a plaintext message to the ONU.
  • An encrypted message ; the ONU responds preferentially to the received encrypted message.
  • the response here means:
  • the ONU preferentially performs the corresponding operation according to the content of different encrypted information.
  • the content of the encrypted information is:
  • the OLT commands the operation performed by the ONU in order to achieve the correct positioning of the abnormal ONU.
  • the OLT can command the ONU to not send data in the uplink bandwidth of the ONU.
  • the corresponding operation performed by the ONU according to the content of the encrypted information is: The ONU does not send in the uplink bandwidth of the ONU itself.
  • the OLT can also command the ONU to send the agreed data in the uplink bandwidth of the ONU.
  • the corresponding operation performed by the ONU according to the content of the encrypted information is:
  • the ONU sends the agreed data in the uplink bandwidth of the ONU itself. .
  • the plaintext information sent by the OLT to the ONU is US BWmap;
  • the encrypted information is a PLOAM message;
  • the OLT sends an encrypted PLOAM message to the ONU at the same time as or before the USBWma is allocated to the ONU, and the ONU preferentially follows the encrypted PLOAM message.
  • the content performs the corresponding operation.
  • the OLT notifies the ONU through the encrypted PLOAM message that after the ONU receives the encrypted PLOAM message sent by the OLT, the ONU does not send data or send the agreed data in the uplink bandwidth allocated by the OLT to itself.
  • the encrypted PLOAM message sent by the OLT is: a PLOAM message named Disable_Serial_Number or Deactivate_ONU-ID, and the OLT performs the message content part of the two PLOAM messages. Encrypted.
  • the PLOAM messages of Disable_Serial_Number or Deactivate_ONU-ID are all existing messages, and in addition to using these two existing messages, an additional PLOAM message can be additionally constructed.
  • the OLT commands the ONU not to transmit data in its own uplink bandwidth
  • the ONU receives the encrypted PLOAM message that the ONU does not send data in its own uplink bandwidth after the OLT sends the command, and the ONU turns off its own laser. It no longer responds to the upstream bandwidth allocated by the OLT.
  • the encrypted PLOAM message sent by the OLT is a newly created PLOAM message
  • the content of the PLOAM message is empty, or the content of the PLOAM message is the agreed data sent by the OLT command ONU. Content.
  • the content of the agreed data sent by the ONU is: the content preset by the OLT and the ONU, or the content of the agreed data sent by the ONU is: OLT commands the content sent by the ONU.
  • the OLT commands the ONU to transmit the agreed data in its own uplink bandwidth
  • the ONU receives the encrypted PLOAM message sent by the OLT to the ONU to transmit the agreed data in its own uplink bandwidth, and the ONU allocates itself to the OLT.
  • the agreed data is sent within the upstream bandwidth.
  • the OLT before the OLT sends the plaintext information to the ONU, the encrypted information is sent to the ONU, and the correct positioning of the abnormal ONU is completed, so that the OLT can correctly parse the ONU.
  • the uplink data quickly restores the normal transmission and reception of the uplink data of the PON system.
  • the agreed data involved in this paper is: In order to meet the needs of the OLT to achieve correct positioning of the abnormal ONU, the data agreed between the OLT and the ONU. Since the data is agreed by both parties in advance, when the OLT receives the agreed-upon agreement data sent by the ONU, it can correctly locate the illuminating abnormality of the ONU.
  • the invention is illustrated by way of example below.
  • the first and second examples are the case where the OLT commands the ONU not to transmit data in its own uplink bandwidth; the third and fourth instances are the case where the OLT commands the ONU to send the agreed data in its own uplink bandwidth.
  • the OLT determines that one of the ONUs in the PON system is abnormally illuminated, and the OLT correctly locates the ONU that is abnormally illuminated. The following steps are taken:
  • Step 201 The OLT allocates bandwidth to all ONUs in the running state, and sends the included component.
  • the downlink frame with the uplink bandwidth content is sent to the ONU, and the OLT sends an encrypted PLOAM message named Disable_Serial_Number to the ONU with the smallest ONU-ID in the same downlink frame, and the OLT performs other content except the ONU-ID part of the Disable_Serial_Number message.
  • Encryption, ie Encryption of the message type, data, and cyclic redundancy check portion of the Disable_Serial_Number message.
  • Step 202 The ONU with the smallest ONU-ID receives the encrypted Disable_Serial_Number message, turns off its own laser, and shifts from the running state to the emergency stop state.
  • the ONU in the emergency stop state no longer responds to the uplink bandwidth allocated by the OLT.
  • Other ONUs send data within the upstream bandwidth allocated by the OLT.
  • Step 203 The OLT receives the uplink frame. If the OLT receives the uplink data in the time slot of the ONU corresponding to the smallest ONU-ID, the OLT may locate the abnormality of the illumination according to the content of the uplink data, for example, the ONU-ID information included in the uplink data.
  • the OLT determines that the ONU with the smallest ONU-ID is an ONU with abnormal illumination;
  • the OLT does not receive uplink data in the time slot of the ONU corresponding to the smallest ONU-ID, and the OLT cannot correctly analyze the uplink data sent by some or all other ONUs.
  • the OLT selects the ONU with the smallest ONU-ID in the ONU currently running. The above steps 201 to 203 are repeated until the OLT correctly locates the ONU that is abnormally illuminated.
  • the OLT sends an encrypted Disable_Serial_Number message to the ONU with the smallest ONU-ID and allocates the uplink bandwidth in the same downlink frame.
  • the OLT can also allocate the uplink bandwidth to the ONU with the smallest ONU-ID.
  • the encrypted Disable_Serial_Number message is sent to the ONU with the smallest ONU-ID.
  • the OLT allocates uplink bandwidth to all ONUs in the running state in step 201. In other examples, the OLT may also allocate uplink bandwidth to the ONUs in all PON systems in step 201.
  • the OLT sends an encrypted PLOAM message named Disable_Serial_Number to the ONU with the smallest ONU-ID in the same downlink frame in step 201. In other examples, the OLT may also be in the same downlink in step 201.
  • An encrypted PLOAM message named Deactivate_ONU-ID is sent to the ONU with the smallest ONU-ID in the frame.
  • the OLT determines that one of the ONUs in the PON system is abnormally illuminated, and the OLT correctly locates the ONU that is abnormally illuminated. The following steps are taken:
  • Step 301 The OLT allocates bandwidth to all ONUs in the running state, and sends a downlink frame including the content of the allocated uplink bandwidth to the ONU, and the OLT sends an encrypted PLOAM named Disable_Serial_Number to the ONU with the smallest ONU-ID in the same downlink frame. Message, the OLT encrypts the contents of the Disable_Serial_Number message except the ONU-ID part.
  • Step 302 The ONU with the smallest ONU-ID receives the encrypted Disable_Serial_Number message, turns off its own laser, and shifts from the running state to the emergency stop state.
  • the ONU in the emergency stop state no longer responds to the uplink bandwidth allocated by the OLT.
  • Other ONUs send data within the upstream bandwidth allocated by the OLT.
  • Step 303 The OLT receives the uplink frame. If the OLT can normally analyze the uplink data sent by the other ONUs, the OLT determines that the ONU with the smallest ONU-ID is an ONU with abnormal illumination; if the OLT cannot correctly analyze the uplink data sent by some or all other ONUs, Then, the OLT selects the ONU with the smallest ONU-ID in the ONU that is currently in the running state, and repeats the above steps 301 to 303 until the OLT correctly locates the ONU that is abnormally illuminated.
  • the OLT sends an encrypted Disable_Serial_Number message to the ONU with the smallest ONU-ID and allocates the uplink bandwidth in the same downlink frame.
  • the OLT can also allocate the uplink bandwidth to the ONU with the smallest ONU-ID.
  • the ONU with the smallest ONU-ID sends the encrypted Disable_Serial_Number message.
  • the OLT allocates uplink bandwidth to all ONUs in the running state in step 301. In other examples, the OLT may also allocate uplink bandwidth to the ONUs in all PON systems in step 301.
  • the OLT sends an encrypted PLOAM message named Disable_Serial_Number to the ONU with the smallest ONU-ID in the same downlink frame in step 301.
  • the OLT may also be in the same downlink in step 301.
  • An encrypted PLOAM message named Deactivate_ONU-ID is sent to the ONU with the smallest ONU-ID in the frame.
  • the OLT determines that an ONU in the PON system is always transmitting data. If the uplink data contains 0 and 1 data, the OLT correctly locates the ONU that emits abnormalities. Take the following steps:
  • Step 401 The OLT allocates bandwidth to all ONUs in the running state, and sends a downlink frame including the content of the allocated uplink bandwidth to the ONU, and the OLT sends the name of the transmission agreement data to the ONU with the smallest ONU-ID in the same downlink frame.
  • Send_Special_Data The encrypted PLOAM message, the OLT encrypts the contents of the Send_Special_Data message except the ONU-ID part.
  • the format of the Send_Special_Data message is shown in Table 1 below. Table 1 shows the structure of the Send_Special_Data message.
  • the content of the data field (Data) is all zeros, indicating ONU
  • the content of the data field (Data) is all 1s, indicating that the ONU turns off the laser in its own upstream bandwidth, and does not send any Data; the content of the data field (Data) is a value of non-all zeros and non-all 1s, indicating that the ONU repeatedly transmits in its own upstream bandwidth.
  • the first byte of the Send_Special_Data message is the value of the ONU-ID, and the content of the byte is 11111111, indicating that the message is broadcast to all ONUs, and the content of the byte is the value ONU-ID1 except 11111111.
  • the message indicates that the message is sent to the ONU whose ONU-ID value is ONU-ID1; the content of the second byte indicates that the type of the PLOAM message is the structure information type of the Send_Special_Data message; the contents of the third to twelfth bytes are OLT
  • the data sent by the ONU is commanded.
  • the content of the data field is all zeros, indicating that the ONU sends all 1s in the first half of its own upstream bandwidth, and the second half turns off the laser, and does not send any data; the content of Data is all 1s. Indicates that the ONU shuts down the laser in its own upstream bandwidth and does not send any data.
  • the content of Data is a value of non-all zeros and non-all ones, indicating that the ONU repeatedly transmits the value of the Data field in its own upstream bandwidth.
  • the content of the ONU-ID field of the Send_Special_Data encrypted message sent by the OLT to the ONU with the smallest ONU-ID is the value of the ONU-ID of the ONU with the smallest ONU-ID, and the value of the Data field is all zeros.
  • Step 402 After receiving the encrypted Send_Special_Data message, the ONU with the smallest ONU-ID sends all 1s in the first half of the upstream bandwidth allocated by the OLT, and the second half closes the laser without transmitting any data. Other ONUs send data within their own upstream bandwidth allocated by the OLT.
  • Step 403 The OLT receives the uplink frame. If the content of the first half of the uplink time slot of the ONU corresponding to the smallest ONU-ID includes 0 and 1, the OLT determines that the ONU is abnormally illuminated; if the ONU of the ONU-ID corresponds to the uplink The first half of the time slot receives all 1s and the second half For the signal including 1 and 0, the OLT determines that the ONU with the smallest ONU-ID is not the ONU with abnormal illumination, and the OLT sends an encrypted PLOAM message named Disable_Serial_Number to the ONU with the smallest ONU-ID, and the OLT removes the ONU-ID portion of the Disable_Serial_Number message.
  • the other content is encrypted.
  • the ONU-ID's smallest ONU receives its encrypted Disable_Serial_Number message and then turns off its own laser. It moves from the running state to the emergency stop state.
  • the ONU in the emergency stop state no longer responds to the upstream bandwidth allocated by the OLT.
  • the OLT selects the ONU with the second smallest ONU-ID in the ONU that is currently in the running state, and repeats the above steps 401 to 403 until the OLT correctly locates the ONU that is abnormally illuminated.
  • the OLT sends an encrypted Send_Special_Data message to the ONU with the smallest ONU-ID and allocates the uplink bandwidth in the same downlink frame.
  • the OLT can also allocate the uplink bandwidth to the ONU with the smallest ONU-ID.
  • the encrypted Send_Special_Data message is sent to the ONU with the smallest ONU-ID.
  • the OLT allocates uplink bandwidth to all ONUs in operation in step 401.
  • the OLT may also allocate uplink bandwidth to ONUs in all PON systems in step 401.
  • the OLT determines that an ONU in the PON system is always transmitting data. If the uplink data is all 1 data, the OLT correctly locates the ONU that is abnormally illuminated. Steps:
  • Step 501 The OLT allocates bandwidth to all ONUs in the running state, and sends a downlink frame including the content of the allocated uplink bandwidth to the ONU, and the OLT sends an encrypted PLOAM named Send_Special_Data to the ONU with the smallest ONU-ID in the same downlink frame.
  • the message, the OLT encrypts the contents of the Send_Special_Data message except the ONU-ID portion.
  • the PLOAM message named Send_Special_Data is as shown in Table 1 above, and the value of the PLOAM message Data i or of the Send_Special_Data is all ones.
  • Step 502 After receiving the encrypted Send_Special_Data message, the ONU with the smallest ONU-ID turns off its own laser in its own uplink bandwidth, and does not send any data.
  • Step 503 The OLT receives the uplink frame. If the OLT receives the all-one signal in the uplink time slot corresponding to the ONU with the smallest ONU-ID, the optical power value P received in the uplink time slot corresponding to the ONU with the smallest ONU-ID is measured. An optical attenuator with an attenuation value of P is inserted at the front end of the received optical signal of the OLT.
  • Step 504 The OLT allocates bandwidth to all ONUs in the running state, and sends a downlink frame including the content of the allocated uplink bandwidth to the ONU, and the OLT sequentially sends an encrypted PLOAM message named Send_Special_Data to the ONU in the running state, and the PLOAM named Send_Special_Data
  • the message is as shown in Table 1 above.
  • the value of the Data field of the PLOAM message of Send_Special_Data is all 0s.
  • the OLT encrypts the contents of the Send_Special_Data message except the ONU-ID portion.
  • Step 505 The OLT receives and parses the uplink frame. If the OLT sends the Send_Special_Data message of step 504 to the ONU whose ONU-ID value is ONU-ID 1, the uplink time slot of the ONU corresponding to the ONU-ID value is ONU-ID1. If the value received by the first half of the first half is not all 1, the OLT determines that the ONU with the ONU-ID value of ONU-ID1 is the ONU with abnormal illumination, otherwise the OLT selects the ONU with the second smallest ONU-ID in the ONU that is currently in the running state. The above steps 501 to 505 are repeated until the OLT correctly locates the ONU that is abnormally illuminated.
  • the OLT allocates uplink bandwidth to all ONUs in operation in step 501.
  • the OLT may also allocate uplink bandwidth to ONUs in all PON systems in step 501.
  • a system for correctly locating an abnormal ONU comprising: a transmitting unit and a positioning unit.
  • the sending unit is configured to send the downlink frame including the encrypted information to the ONU at the same time as or before the OLT sends the downlink frame including the plaintext information to the ONU.
  • the locating unit is configured to respond to the received encrypted information by the ONU, so that the OLT realizes the correct ONU of the illuminating abnormality. Positioning.
  • the plaintext information specifically includes: a US BWmap allocated by the OLT to the ONU; the encrypted information specifically includes: an encrypted PLOAM message.
  • the locating unit further includes a response module.
  • the response module is configured to respond to the encrypted information by the ONU, the ONU performs an operation performed by the OLT according to the content of the encrypted PLOAM message.
  • the content of the encrypted PLOAM message is: The OLT commands the operation performed by the ONU to locate the need to illuminate the abnormal ONU.
  • the ONU responds to the different contents of the encrypted PLOAM message, corresponding to the operation performed by the OLT command ONU, that is, the specific implementation of the response module is different, which are respectively described below.
  • the content of the PLOAM message further used by the response module is specifically as follows:
  • the OLT commands the ONU to not send data in its US BWma
  • the ONU turns off its own laser and no longer responds.
  • the OLT allocates the US BWmap to the ONU itself, so that the ONU does not send data in its US BWma.
  • the content of the PLOAM message further used by the response module is specifically:
  • the OLT commands the ONU to send the agreed data in its own US BWma
  • the ONU sends the agreement in its own US BWma. The data.

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Description

一种对发光异常光网络单元正确定位的方法及系统 技术领域
本发明涉及无源光网络 ( PON )领域， 尤其涉及一种 PON系统中对发 光异常光网络单元（ONU )正确定位的方法及系统。 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， 因此对带宽的要求不断提高， PON技术就是在这种需求下产生的。 PON系统通常由局侧的光线路终端 （OLT )、 用户侧的 ONU和光分配网络 ( ODN )组成， 通常釆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， ODN为 OLT和 ONU之间的物理连接提 供光传输媒质。
在吉比特无源光网络（GPON ) 系统中， 对于下行方向， 即由 OLT到 ONU方向的数据传输釆用广播方式， 每个 ONU分别接收所有的帧， 再根 据 ONU标识（ ONU-ID )、 吉比特无源光网络封装方法端口标识（ GEM-Port ID )、 分配标识 （Allocation-ID ) 来获取属于自己的帧。 对于上行方向， 即 由从 ONU到 OLT方向的数据传输， 由于各个 ONU需要共享传输媒质， 因 此各个 ONU应该在 OLT安排给自己的时隙内传输上行数据。 GPON的传 输汇聚（GTC, G-PON Transmission Convergence )层的下行帧结构如图 1 所示。
图 1中， 下行帧由下行物理控制块（PCBd )和净荷两部分组成， 其中 PCBd由物理同步 ( Psync, Physical Synchronization ) i或、 标识 ( Ident ) i或、 PlOAMd域、 比特间插奇偶校验（BIP, Bit Interleaved Parity )域、 下行净 荷长度（ Plend, Payload Length downstream )域和上行带宽映射（ US BWmap ) 域组成。 其中， PlOAMd是 Physical Layer OAM downstream的缩写； OAM 是 Operation, Administraion& Maintenance的缩写， 指操作、 管理与维护。
图 1中， US BWmap域由 N个分配结构 （ Allocation Structure )组成。 任一个 Allocation Structure由带宽分配标识（ Alloc-ID, Allocation Identifier ) 域、 标识位 （Flags ) 域、 带宽起始时间 （StartTime ) 域、 带宽结束时间 ( StopTime )域和循环冗余校验码 ( CRC, Cyclic Redundancy Check )域组 成。 其中， Alloc-ID —般是传输容器（T-CONT, Transmission Container ) 的标识； Flags域即为带宽分配的选项， 12位比特， 比特 11-0, 其中比特 10 用于通知 ONU 在该上行带宽中发送物理层操作管理维护 （PLOAM, Physical layer Operations Administration and Maintenance)消息, 比特 6-0为保 留。
OLT利用 PLOAM消息实现对 ONU的部分管理功能时， 包括 ONU激 活、 ONU管理控制通道的建立、 加密配置、 密钥管理等管理功能。 当 ONU 接收到一个 Allocation structure时， ONU对接收到的 Allocation structure中 的数据进行 CRC校验， 如果校验结果正确， 且 ONU根据 Alloc-ID判断此 Allocation structure是分配给自己的， 则 ONU将在 Allocation structure指示 的 StartTime时刻开始发送带宽分配标识为 Alloc-ID的 T-CONT中的数据， 在 StopTime时刻停止发送数据。 如果 PON系统中的某个 ONU在 OLT分 配给其他 ONU的 Allocation structure对应的上行带宽内打开激光器发光或 者发送上行数据， 则存在两个 ONU同时在上行信道上发光或者发送数据， 导致 OLT不能正常解析接收到的上行数据。 也就是说， 如果存在发光异常 的 ONU, 则发光异常的 ONU会和其他 ONU同时发光、 或者发光异常的 ONU会占用 OLT分配给其他 ONU的时隙传输上行数据，从而导致 OLT不 能正常解析接收到的上行数据， OLT需要定位发光异常的 ONU。
现有技术中， OLT定位发光异常的 ONU所釆用的方案是： OLT可以通 过逐一的给系 统 中 的各个 ONU 发送名 为 去使能序 列 号
( Disable_Serial_Number )或者去激活 ONU标识（ Deactivate_ONU-ID )的 PLOAM消息， 使收到 PLO AM消息的 ONU关闭自身的激光器， 实现对发 光异常 ONU的定位。 如果发光异常的 ONU在 OLT分配给其他 ONU的上 行带宽发光或者发送数据， 并在 OLT 分配给自己的上行带宽内正常响应 OLT的命令，或者发光异常的 ONU在整个上行带宽内一直发光或者发送数 据， 并且发光异常的 ONU发送的数据内没有携带自己的正确身份标识信 息， 则 OLT很难实现对发光异常 ONU的正确定位， 导致发光异常 ONU的 上述行为影响整个 PON系统的上行数据传输。 目前迫切需要一种能实现对 发光异常 ONU正确定位的解决方案， 以避免对发光异常 ONU定位不正确 所导致的发光异常 ONU影响整个 PON系统上行数据传输的问题。 发明内容
有鉴于此，本发明的主要目的在于提供一种对发光异常 ONU正确定位 的方法及系统， 能实现对发光异常 ONU 的正确定位， 以避免对发光异常 ONU定位不正确所导致的发光异常 ONU影响整个 PON系统上行数据传输 的问题。
为达到上述目的， 本发明的技术方案是这样实现的：
一种对发光异常光网络单元正确定位的方法， 该方法包括：
光线路终端（ OLT )将包含明文信息的下行帧发送给光网络单元（ ONU ) 之前，所述 OLT向所述 ONU发送包含加密信息的下行帧； 或者，所述 OLT 将明文信息和加密信息包含在同一个下行帧中发送给所述 ONU;
通过所述 ONU对收到的加密信息的优先响应， 使 OLT实现对发光异 常 ONU的正确定位。
其中， 所述明文信息包括： OLT 分配给 ONU 的上行带宽映射 （US
BWmap ); 所述加密信息包括： 加密的物理层操作管理维护 （ PLOAM ) 消 息；
所述 ONU对所述加密信息的优先响应包括： 所述 ONU根据加密的 PLOAM消息的内容， 执行所述 OLT命令所述 ONU执行的操作；
其中， 所述加密的 PLOAM消息的内容为： 满足所述 OLT实现正确定 位发光异常 ONU的需要， 所述 OLT命令所述 ONU所执行的操作。
其中， 所述加密的 PLOAM消息的内容为： 所述 OLT命令所述 ONU 在自身的 US BWma 内不发送数据时， 所述加密的 PLOAM消息釆用现有 的 PLOAM消息或新建的 PLOAM消息， 且对现有的 PLOAM消息或新建 的 PLOAM消息的消息内容部分进行加密；
其中， 所述现有的 PLOAM消息包括： Disable_Serial_Number消息、 或 Deactivate_ONU-ID消息。 所述 ONU关闭自身的激光器，不再响应所述 OLT分配给所述 ONU自身的 US BWmap, 实现所述 ONU在自身的 US BWma 内不发送数据。
其中， 所述加密的 PLOAM消息的内容为： 所述 OLT命令所述 ONU 在自身的 US BWma 内发送约定的数据时， 所述加密的 PLOAM消息仅釆 用新建的 PLOAM消息 , 且对新建的 PLOAM消息的消息内容部分进行加 密。
ONU在自身的 US BWma 内发送所述约定的数据。
一种对发光异常光网络单元正确定位的系统， 该系统包括： 发送单元 和定位单元； 其中，
所述发送单元， 用于 OLT将包含明文信息的下行帧发送给 ONU之前， 所述 OLT向所述 ONU发送包含加密信息的下行帧； 或者， 所述 OLT将明 文信息和加密信息包含在同一个下行帧中发送给所述 ONU; 所述定位单元， 用于通过所述 ONU对收到的加密信息的优先响应， 使
OLT实现对发光异常 ONU的正确定位。
其中， 所述明文信息包括： OLT分配给 ONU的 US BWmap; 所述加密 信息包括： 加密的 PLO AM消息；
所述定位单元进一步包括： 响应模块， 用于所述 ONU对所述加密信息 优先响应时， 所述 ONU根据加密的 PLOAM消息的内容， 执行所述 OLT 命令所述 ONU执行的操作； 其中， 所述加密的 PLOAM消息的内容为： 满 足所述 OLT实现正确定位发光异常 ONU的需要，所述 OLT命令所述 ONU 所执行的操作。
其中， 所述响应模块， 进一步用于所述加密的 PLOAM消息的内容为： 所述 OLT命令所述 ONU在自身的 US BWma 内不发送数据时， 通过所述 ONU关闭自身的激光器， 不再响应所述 OLT分配给所述 ONU 自身的 US BWmap, 实现所述 ONU在自身的 US BWma 内不发送数据。
其中， 所述响应模块， 进一步用于所述加密的 PLOAM消息的内容为： 所述01^命令所述01^1；在自身的1；8 8\¥11^内发送约定的数据时， 所述 ONU在自身的 US BWma 内发送所述约定的数据。
本发明的 OLT将包含明文信息的下行帧发送给 ONU之前， OLT向 ONU 发送包含加密信息的下行帧； 或者， OLT将明文信息和加密信息包含在同 一个下行帧中发送给 ONU; 通过 ONU对收到的加密信息的优先响应， 使 OLT实现对发光异常 ONU的正确定位。
釆用本发明， OLT发送的下行帧中包括一类特殊的下行帧， 这类下行 帧中包含加密信息，当 ONU收到包含加密信息的这类下行帧时，通过 ONU 优先响应这类下行帧中的加密信息， 实现 OLT对发光异常 ONU的正确定 位。 附图说明
图 1为现有 GPON系统下行帧的结构示意图；
图 2为本发明方法原理的实现流程示意图。 具体实施方式
本发明的基本思想是： 通过 ONU优先响应加密信息， 实现 OLT对发 光异常 ONU的正确定位。
下面结合附图对技术方案的实施作进一步的详细描述。
如图 2所示， 一种对发光异常 ONU正确定位的方法， 该方法包括以下 步骤：
步骤 101、 OLT将包含明文信息的下行帧发送给 ONU之前， OLT向 ONU发送包含加密信息的下行帧； 或者， OLT将明文信息和加密信息包含 在同一个下行帧中发送给 ONU。
这里需要指出的是： 由于 OLT在同一个时刻只能发送一个下行帧， 不 能同时发送两个下行帧， 因此， OLT在发送包含明文信息的下行帧之前， 需在另一个下行帧内发送包含加密信息的下行帧； 或者， OLT在同一个下 行帧内的不同部分分别封装明文信息和加密信息， 以通过这同一个下行帧 将明文信息和加密信息一起发送给 ONU。 而且， 在下行帧内可以封装明文 信息、和 /或加密信息，为了使 OLT实现对发光异常 ONU的正确定位， ONU 仅对包含加密信息的下行帧进行优先响应。
这里， 明文信息具体包括： OLT分配给 ONU的 US BWmap; 加密信息 具体包括： 加密的 PLO AM消息。
步骤 102、通过 ONU对收到的加密信息的优先响应，使 OLT实现对发 光异常 ONU的正确定位。
这里， 当明文信息具体为 OLT分配给 ONU的 US BWmap, 加密信息 具体为加密的 PLOAM消息时， 步骤 102中， ONU对收到的加密信息的优 先响应具体包括： ONU根据加密的 PLOAM消息的内容， 执行 OLT命令 ONU执行的操作。 其中， 加密的 PLOAM消息的内容为： 满足 OLT实现正 确定位发光异常 ONU的需要， OLT命令 ONU所执行的操作。
这里 , 加密的 PLOAM消息的内容不同时 , ONU才艮据加密的 PLOAM 消息的不同内容， 对应执行 OLT命令 ONU所执行的操作， 以下分别阐述。
第一种情况： 加密的 PLOAM消息的内容具体为： OLT命令 ONU在 OLT为该 ONU自身分配的 US BWma 内不发送数据。
这种情况下， 加密的 PLOAM消息釆用现有的 PLOAM消息或新建的 PLOAM消息，且对现有的 PLOAM消息或新建的 PLOAM消息的消息内容 部分进行加密。其中，现有的 PLOAM消息具体包括： Disable_Serial_Number 消息、 或 Deactivate_ONU-ID消息。
这种情况下， ONU执行 OLT命令该 ONU执行的操作具体包括： 通过 该 ONU 关闭自身的激光器， 不再响应 OLT 分配给该 ONU 自身的 US BWmap, 实现该 ONU在自身的 US BWma 内不发送数据。
第二种情况： 加密的 PLOAM消息的内容具体为： OLT命令 ONU在 OLT为该 ONU自身分配的 US BWma 内发送约定的数据。
这种情况下， 加密的 PLOAM消息仅釆用新建的 PLOAM消息， 且对 新建的 PLOAM消息的消息内容部分进行加密。
这种情况下， ONU执行 OLT命令该 ONU执行的操作具体包括： 该 ONU在 OLT分配给该 ONU自身的 US BWma 内发送约定的数据。
综上所述， 本发明中， OLT发送的下行帧中包括一类特殊的下行帧， 即： 包含加密信息的下行帧， 通过 ONU优先响应这类包含加密信息的下行 帧， 以实现 OLT对发光异常 ONU的正确定位。
本发明主要包括以下内容：
在 OLT给 ONU发送一份明文信息的同时或之前， OLT给 ONU发送了 一份加密信息； ONU对收到的这份加密信息优先响应。这里的响应指： ONU 优先按照不同加密信息的内容执行相对应的操作。 其中， 加密信息的内容 即为： OLT为了达到正确定位发光异常 ONU的需要， 命令 ONU所执行的 操作。 举例来说， OLT可以命令 ONU在该 ONU自身的上行带宽内不发送 数据，此时， ONU优先按照加密信息的内容执行的相对应的操作即为： ONU 在该 ONU自身的上行带宽内不发送数据； OLT也可以命令 ONU在该 ONU 自身的上行带宽内发送约定数据， 此时， ONU优先按照加密信息的内容执 行的相对应的操作即为： ONU在该 ONU自身的上行带宽内发送约定数据。
进一步地， OLT发送给 ONU的上述明文信息为 US BWmap; 上述加密 信息为 PLOAM消息； OLT在给一个 ONU分配 US BWma 的同时或之前， 给 ONU发送加密的 PLOAM消息， ONU优先按照加密的 PLOAM消息的 内容执行相对应的操作。
进一步地， OLT通过加密的 PLOAM消息通知 ONU下述内容：在 ONU 收到 OLT发送的加密的 PLOAM消息后， ONU在 OLT分配给自身的上行 带宽内不发送数据或者发送约定的数据。
进一步地， 当 OLT命令 ONU在自身的上行带宽内不发送数据时， OLT 发送的加密的 PLOAM 消息为： 名为 Disable_Serial_Number 或者 Deactivate_ONU-ID的 PLOAM消息， OLT对上述两个 PLOAM消息的消息 内容部分进行了加密。这里， Disable_Serial_Number或者 Deactivate_ONU-ID 的 PLOAM 消息都是现有的消息， 除了釆用这两个现有的消息之外， 还可 以额外构建新的 PLOAM消息。
进一步地， 在 OLT命令 ONU在自身的上行带宽内不发送数据的情况 下， ONU接收到 OLT发送的命令该 ONU在自身的上行带宽内不发送数据 的加密 PLOAM消息后， ONU关闭自己的激光器， 不再响应 OLT分配的上 行带宽。 进一步地， 当 OLT命令 ONU在自身的上行带宽内发送约定数据时， OLT发送的加密 PLOAM消息为新建的 PLOAM消息， PLOAM消息的内容 为空、 或者 PLOAM消息的内容为 OLT命令 ONU发送的约定数据的内容。
进一步地， ONU发送的约定数据的内容为： OLT和 ONU预先设定的 内容、 或者 ONU发送的约定数据的内容为： OLT命令 ONU发送的内容。
进一步地， 在 OLT命令 ONU在自身的上行带宽内发送约定数据的情 况下， ONU接收到 OLT发送的命令该 ONU在自身的上行带宽内发送约定 数据的加密 PLOAM消息后， ONU在 OLT分配给自己的上行带宽内发送该 约定数据。
综上所述， 本发明中， OLT给 ONU发送明文信息的之前或同时， 给 ONU发送了一份加密的信息，有效的完成了对发光异常 ONU的正确定位， 从而 OLT能正确解析 ONU发送的上行数据， 快速恢复了 PON系统上行数 据的正常传输和接收。
这里需要指出的是： 本文所涉及到的约定数据即为： 为了满足 OLT实 现正确定位发光异常 ONU的需要， OLT与 ONU事先约定的数据。 由于数 据是双方事先约定好的， 因此， 当 OLT收到 ONU发送的约定好的该约定 数据后， 才能正确定位出发光异常 ONU到底是哪个。
以下对本发明进行举例阐述。 实例一和实例二是 OLT命令 ONU在自 身的上行带宽内不发送数据的情况； 实例三和实例四是 OLT命令 ONU在 自身的上行带宽内发送约定数据的情况。
实例一：
当 PON系统中的 OLT无法正确解析部分或全部上行数据时， OLT判 断 PON系统中的某个 ONU发光异常， OLT对发光异常的 ONU进行正确 定位釆取以下步骤：
步骤 201、 OLT给所有处于运行状态的 ONU分配带宽， 并发送包含分 配上行带宽内容的下行帧给 ONU, 同时 OLT 在同一个下行帧内给上述 ONU-ID最小的 ONU发送名为 Disable_Serial_Number的加密 PLOAM消息， OLT对 Disable_Serial_Number消息的除 ONU-ID部分外的其他内容进行了 加密， 即： 对 Disable_Serial_Number消息的消息类型、 数据和循环冗余校 验部分进行了加密。
步骤 202、 ONU-ID最小的 ONU接收到加密的 Disable_Serial_ Number 消息后关闭自身的激光器， 并从运行状态转移到紧急停止状态， 在紧急停 止状态的 ONU不再响应 OLT分配的上行带宽。 其他 ONU在 OLT分配的 属于自己的上行带宽内发送数据。
步骤 203、 OLT接收上行帧， 如果 OLT在对应 ONU-ID最小的 ONU 的时隙内接收到上行数据， OLT 可以根据上行数据的内容， 例如上行数据 中包含的 ONU-ID信息定位到发光异常的 ONU; 如果 OLT在对应 ONU-ID 最小的 ONU的时隙内没有接收到上行数据， 并且 OLT可以正常解析其他 ONU发送的上行数据， 则 OLT判断 ONU-ID最小的 ONU为发光异常的 ONU; 如果 OLT在对应 ONU-ID最小的 ONU的时隙内没有接收到上行数 据，并且 OLT不能正常解析部分或全部其他 ONU发送的上行数据，则 OLT 选择当前处于运行状态的 ONU中 ONU-ID最小的 ONU,重复上述步骤 201 到步骤 203 , 直到 OLT正确定位到发光异常的 ONU。
在本实例中， OLT在同一个下行帧内给 ONU-ID最小的 ONU发送加密 的 Disable_Serial_Number消息和分配上行带宽， 在其他的实例中， OLT也 可以在给 ONU-ID 最小的 ONU 发送分配上行带宽的下行帧之前， 给 ONU-ID最小的 ONU发送加密的 Disable_Serial_Number消息。
在本实例中， OLT在步骤 201中给所有处于运行状态的 ONU分配上行 带宽， 在其他的实例中， OLT也可以在步骤 201 中给所有 PON 系统中的 ONU分配上行带宽。 在本实例中， OLT在步骤 201中在同一个下行帧内给上述 ONU-ID最 小的 ONU发送名为 Disable_Serial_Number的加密 PLOAM消息，在其他的 实例中， OLT也可以在步骤 201中在同一个下行帧内给上述 ONU-ID最小 的 ONU发送名为 Deactivate_ONU-ID的加密 PLOAM消息。
实例二：
当 PON系统中的 OLT无法正确解析部分或全部上行数据时， OLT判 断 PON系统中的某个 ONU发光异常， OLT对发光异常的 ONU进行正确 定位釆取以下步骤：
步骤 301、 OLT给所有处于运行状态的 ONU分配带宽， 并发送包含分 配上行带宽内容的下行帧给 ONU, 同时 OLT 在同一个下行帧内给上述 ONU-ID最小的 ONU发送名为 Disable_Serial_Number的加密 PLOAM消息， OLT对 Disable_Serial_Number消息的除 ONU-ID部分外的其他内容进行了 加密。
步骤 302、 ONU-ID最小的 ONU接收到加密的 Disable_Serial_ Number 消息后关闭自身的激光器， 并从运行状态转移到紧急停止状态， 在紧急停 止状态的 ONU不再响应 OLT分配的上行带宽。 其他 ONU在 OLT分配的 属于自己的上行带宽内发送数据。
步骤 303、 OLT接收上行帧，如果 OLT可以正常解析其他 ONU发送的 上行数据， 则 OLT判断 ONU-ID最小的 ONU为发光异常的 ONU; 如果 OLT不能正常解析部分或全部其他 ONU发送的上行数据， 则 OLT选择当 前处于运行状态的 ONU中 ONU-ID最小的 ONU, 重复上述步骤 301到步 骤 303 , 直到 OLT正确定位到发光异常的 ONU。
在本实例中， OLT在同一个下行帧内给 ONU-ID最小的 ONU发送加密 的 Disable_Serial_Number消息和分配上行带宽， 在其他的实例中， OLT也 可以在给 ONU-ID 最小的 ONU 发送分配上行带宽的下行帧之前， 给 ONU-ID最小的 ONU发送加密的 Disable_Serial_Number消息。 在本实例中， OLT在步骤 301中给所有处于运行状态的 ONU分配上行 带宽， 在其他的实例中， OLT也可以在步骤 301 中给所有 PON 系统中的 ONU分配上行带宽。
在本实例中， OLT在步骤 301中在同一个下行帧内给上述 ONU-ID最 小的 ONU发送名为 Disable_Serial_Number的加密 PLOAM消息，在其他的 实例中， OLT也可以在步骤 301中在同一个下行帧内给上述 ONU-ID最小 的 ONU发送名为 Deactivate_ONU-ID的加密 PLOAM消息。
实例三：
当 PON系统中的 OLT无法正确解析全部上行数据时， OLT判断 PON 系统中的某个 ONU在一直发送数据， 如果上行数据中包含 0和 1的数据 , 则 OLT对发光异常的 ONU进行正确定位釆取以下步骤：
步骤 401、 OLT给所有处于运行状态的 ONU分配带宽， 并发送包含分 配上行带宽内容的下行帧给 ONU, 同时 OLT 在同一个下行帧内给上述 ONU-ID最小的 ONU发送名为发送约定数据 ( Send_Special_Data ) 的加密 PLOAM消息， OLT对 Send_Special_Data消息的除 ONU-ID部分外的其他 内容进行了加密。 Send_Special_Data消息的格式如以下表 1所示， 表 1为 Send_Special_Data消息的结构。
Figure imgf000014_0001
数据域（ Data ) 的内容为全零， 表示 ONU
在属于自己的上行带宽的前半部分发送全 1， 后半部分关闭激光器， 不发送任何数据； 数据 域（ Data ) 的内容为全 1， 表示 ONU在属于自 己的上行带宽内关闭激光器， 不发送任何数 据； 数据域（ Data ) 的内容为非全零和非全 1 的值， 表示 ONU在自己的上行带宽重复发送
Data域的值。
表 1
如表 1所示， Send_Special_Data消息的第一字节为 ONU-ID的值， 该 字节的内容为 11111111 , 表示向所有 ONU广播该消息， 该字节的内容为除 11111111外的值 ONU-ID1时， 表示该消息发送给 ONU-ID值为 ONU-ID1 的 ONU; 第二字节的内容表示该 PLOAM消息的类型为 Send_Special_Data 消息的结构信息类型； 第三到第十二字节的内容为 OLT命令 ONU发送的 数据， 数据域（Data )的内容为全零， 表示 ONU在属于自己的上行带宽的 前半部分发送全 1 ,后半部分关闭激光器， 不发送任何数据； Data的内容为 全 1 , 表示 ONU在属于自己的上行带宽内关闭激光器， 不发送任何数据； Data的内容为非全零和非全 1的值，表示 ONU在自己的上行带宽重复发送 Data域的值。
OLT给上述 ONU-ID最小的 ONU发送的 Send_Special_Data加密消息 的 ONU-ID域的内容为上述 ONU-ID最小的 ONU的 ONU-ID的值， Data 域的值为全零。
步骤 402、 ONU-ID最小的 ONU接收到加密的 Send_Special_Data消息 后在 OLT分配给自己的上行带宽内的前半部分发送全 1 , 后半部分关闭激 光器， 不发送任何数据。 其他 ONU在 OLT分配的属于自己的上行带宽内 发送数据。
步骤 403、 OLT接收上行帧， 如果对应 ONU-ID最小的 ONU的上行时 隙内的前半部分的内容包含 0和 1 , 则 OLT判断为发光异常的 ONU; 如果 对应 ONU-ID最小的 ONU的上行时隙内的前半部分接收到全 1 , 后半部分 为包含 1和 0的信号， 则 OLT判断 ONU-ID最小的 ONU不是发光异常的 ONU, OLT给 ONU-ID最小的 ONU发送名为 Disable_Serial_Number的加 密 PLOAM消息， OLT对 Disable_Serial_Number消息的除 ONU-ID部分外 的其他内容进行了加密， ONU-ID 最小的 ONU 接收到加密的 Disable_Serial_Number 消息后关闭自身的激光器， 并从运行状态转移到紧 急停止状态，在紧急停止状态的 ONU不再响应 OLT分配的上行带宽， OLT 选择当前处于运行状态的 ONU中 ONU-ID第二小的 ONU, 重复上述步骤 401到步骤 403 , 直到 OLT正确定位到发光异常的 ONU。
在本实例中， OLT在同一个下行帧内给 ONU-ID最小的 ONU发送加密 的 Send_Special_Data消息和分配上行带宽， 在其他的实例中， OLT也可 以在给 ONU-ID最小的 ONU发送分配上行带宽的下行帧之前， 给 ONU-ID 最小的 ONU发送加密的 Send_Special_Data消息。
在本实例中， OLT在步骤 401中给所有处于运行状态的 ONU分配上行 带宽， 在其他的实例中， OLT也可以在步骤 401 中给所有 PON 系统中的 ONU分配上行带宽。
实例四：
当 PON系统中的 OLT无法正确解析全部上行数据时， OLT判断 PON 系统中的某个 ONU在一直发送数据， 如果上行数据是全 1的数据， 则 OLT 对发光异常的 ONU进行正确定位釆取以下步骤：
步骤 501、 OLT给所有处于运行状态的 ONU分配带宽， 并发送包含分 配上行带宽内容的下行帧给 ONU, 同时 OLT 在同一个下行帧内给上述 ONU-ID最小的 ONU发送名为 Send_Special_Data的加密 PLOAM消息， OLT对 Send_Special_Data消息的除 ONU-ID部分外的其他内容进行了加密。 名为 Send_Special_Data的 PLOAM消息如以上表 1所示， Send_Special_Data 的 PLOAM消息 Data i或的值为全 1。 步骤 502、 ONU-ID最小的 ONU接收到加密的 Send_Special_Data消息 后在自己的上行带宽内关闭自身的激光器， 不发送任何数据。
步骤 503、 OLT接收上行帧， 如果 OLT在对应 ONU-ID最小的 ONU 的上行时隙内接收到全 1的信号，测量对应 ONU-ID最小的 ONU的上行时 隙内接收的光功率值 P。 在 OLT的接收光信号前端插入一个衰减值为 P的 光衰减器。
步骤 504、 OLT给所有处于运行状态的 ONU分配带宽， 并发送包含分 配上行带宽内容的下行帧给 ONU, 并且 OLT依次给处于运行状态的 ONU 发送名为 Send_Special_Data的加密 PLOAM消息， 名为 Send_Special_Data 的 PLOAM消息如以上表 1所示， Send_Special_Data的 PLOAM消息 Data 域的值为全 0。 OLT对 Send_Special_Data消息的除 ONU-ID部分外的其他 内容进行了加密。
步骤 505、 OLT接收并解析上行帧，如果 OLT给 ONU-ID值为 ONU-ID 1 的 ONU发送了步骤 504的 Send_Special_Data消息后， 在对应 ONU-ID值 为 ONU-ID1的 ONU的上行时隙内的前半部分接收到的值如果不是全 1 , 则 OLT判断 ONU-ID值为 ONU-ID1的 ONU为发光异常的 ONU,否则 OLT 选择当前处于运行状态的 ONU中 ONU-ID第二小的 ONU, 重复上述步骤 501到步骤 505 , 直到 OLT正确定位到发光异常的 ONU。
在本实例中， OLT在步骤 501中给所有处于运行状态的 ONU分配上行 带宽， 在其他的实例中， OLT也可以在步骤 501 中给所有 PON 系统中的 ONU分配上行带宽。
一种对发光异常 ONU正确定位的系统， 该系统包括： 发送单元和定位 单元。 其中， 发送单元用于 OLT将包含明文信息的下行帧发送给 ONU的 同时或之前， OLT向 ONU发送包含加密信息的下行帧。 定位单元用于通过 ONU对收到的加密信息的优先响应， 使 OLT实现对发光异常 ONU的正确 定位。
这里， 明文信息具体包括： OLT分配给 ONU的 US BWmap; 加密信息 具体包括： 加密的 PLOAM 消息。 定位单元进一步包括响应模块， 响应模 块用于 ONU对加密信息优先响应时， ONU根据加密的 PLOAM消息的内 容 , 执行 OLT命令 ONU执行的操作； 其中， 加密的 PLOAM消息的内容 为： 满足 OLT实现正确定位发光异常 ONU的需要， OLT命令 ONU所执行 的操作。
这里 , 加密的 PLOAM消息的内容不同时 , ONU才艮据加密的 PLOAM 消息的不同内容， 对应执行 OLT命令 ONU所执行的操作， 也就是说响应 模块的具体实现有所不同， 以下分别阐述。
针对响应模块的第一种具体实现而言， 响应模块进一步用于加密的 PLOAM消息的内容具体为： OLT命令 ONU在自身的 US BWma 内不发送 数据时， 通过 ONU关闭自身的激光器， 不再响应 OLT分配给 ONU自身的 US BWmap, 实现 ONU在自身的 US BWma 内不发送数据。
针对响应模块的第二种具体实现而言， 响应模块进一步用于加密的 PLOAM消息的内容具体为： OLT命令 ONU在自身的 US BWma 内发送约 定的数据时， ONU在自身的 US BWma 内发送约定的数据。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种对发光异常光网络单元正确定位的方法， 其特征在于， 该方法 包括：
光线路终端（ OLT )将包含明文信息的下行帧发送给光网络单元（ ONU ) 之前，所述 OLT向所述 ONU发送包含加密信息的下行帧； 或者，所述 OLT 将明文信息和加密信息包含在同一个下行帧中发送给所述 ONU;
通过所述 ONU对收到的加密信息的优先响应， 使 OLT实现对发光异 常 ONU的正确定位。
2、根据权利要求 1所述的方法，其特征在于，所述明文信息包括： OLT 分配给 ONU的上行带宽映射（US BWmap ); 所述加密信息包括： 加密的 物理层操作管理维护（PLOAM ) 消息；
所述 ONU对所述加密信息的优先响应包括： 所述 ONU根据加密的 PLOAM消息的内容， 执行所述 OLT命令所述 ONU执行的操作；
其中， 所述加密的 PLOAM消息的内容为： 满足所述 OLT实现正确定 位发光异常 ONU的需要， 所述 OLT命令所述 ONU所执行的操作。
3、 根据权利要求 2所述的方法， 其特征在于， 所述加密的 PLOAM消 息的内容为： 所述 OLT命令所述 ONU在自身的 US BWma 内不发送数据 时， 所述加密的 PLOAM消息釆用现有的 PLOAM消息或新建的 PLOAM 消息， 且对现有的 PLOAM消息或新建的 PLOAM消息的消息内容部分进 行力口密；
其中， 所述现有的 PLOAM消息包括： Disable_Serial_Number消息、 或 Deactivate_ONU-ID消息。
4、根据权利要求 3所述的方法，其特征在于，所述 ONU执行所述 OLT 命令所述 ONU执行的操作包括： 通过所述 ONU关闭自身的激光器， 不再 响应所述 OLT分配给所述 ONU自身的 US BWmap,实现所述 ONU在自身 的 US BWma 内不发送数据。
5、 根据权利要求 2所述的方法， 其特征在于， 所述加密的 PLOAM消 息的内容为： 所述 OLT命令所述 ONU在自身的 US BWma 内发送约定的 数据时， 所述加密的 PLO AM消息仅釆用新建的 PLO AM消息， 且对新建 的 PLO AM消息的消息内容部分进行加密。
6、根据权利要求 5所述的方法，其特征在于，所述 ONU执行所述 OLT 命令所述 ONU执行的操作包括：所述 ONU在自身的 US BWma 内发送所 述约定的数据。
7、 一种对发光异常光网络单元正确定位的系统， 其特征在于， 该系统 包括： 发送单元和定位单元； 其中，
所述发送单元， 用于 OLT将包含明文信息的下行帧发送给 ONU之前， 所述 OLT向所述 ONU发送包含加密信息的下行帧； 或者， 所述 OLT将明 文信息和加密信息包含在同一个下行帧中发送给所述 ONU;
所述定位单元， 用于通过所述 ONU对收到的加密信息的优先响应， 使 OLT实现对发光异常 ONU的正确定位。
8、根据权利要求 7所述的系统，其特征在于，所述明文信息包括： OLT 分配给 ONU的 US BWmap; 所述加密信息包括： 加密的 PLOAM消息； 所述定位单元进一步包括： 响应模块， 用于所述 ONU对所述加密信息 优先响应时， 所述 ONU根据加密的 PLOAM消息的内容， 执行所述 OLT 命令所述 ONU执行的操作； 其中， 所述加密的 PLOAM消息的内容为： 满 足所述 OLT实现正确定位发光异常 ONU的需要，所述 OLT命令所述 ONU 所执行的操作。
9、 根据权利要求 8所述的系统， 其特征在于， 所述响应模块， 进一步 用于所述加密的 PLOAM消息的内容为： 所述 OLT命令所述 ONU在自身 的 US BWmap内不发送数据时， 通过所述 ONU关闭自身的激光器， 不再 响应所述 OLT分配给所述 ONU自身的 US BWmap,实现所述 ONU在自身 的 US BWma 内不发送数据。
10、 根据权利要求 8所述的系统， 其特征在于， 所述响应模块， 进一 步用于所述加密的 PLOAM消息的内容为： 所述 OLT命令所述 ONU在自 身的 US BWma 内发送约定的数据时， 所述 ONU在自身的 US BWma 内 发送所述约定的数据。
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