WO2017097020A1 - 一种无源光网络兼容装置及其实现方法和光线路终端 - Google Patents

一种无源光网络兼容装置及其实现方法和光线路终端 Download PDF

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Publication number
WO2017097020A1
WO2017097020A1 PCT/CN2016/100938 CN2016100938W WO2017097020A1 WO 2017097020 A1 WO2017097020 A1 WO 2017097020A1 CN 2016100938 W CN2016100938 W CN 2016100938W WO 2017097020 A1 WO2017097020 A1 WO 2017097020A1
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unit
uplink
data
onu
standard
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PCT/CN2016/100938
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English (en)
French (fr)
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龙光平
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深圳市中兴微电子技术有限公司
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking

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  • the present invention relates to a Passive Optical Network (PON) system transmission technology, and in particular to a passive optical network compatible device, an implementation method thereof, and an Optical Line Terminal (OLT).
  • PON Passive Optical Network
  • OLT Optical Line Terminal
  • NGPON N Gigabit-Capable Passive Optical Network
  • the NGPON is divided into two standards: XGPON (X GPON, X Gigabit-Capable Passive Optical Network) and NGPON2; XGPON is in asymmetric mode (uplink 2.5Gbit/s, downlink 10Gbit/s), symmetric mode (uplink 10Gbit/s, downlink 10Gbit/s) is called NGPON2; NGPON2 uplink rate is 10Gbit/s.
  • XGPON X GPON, X Gigabit-Capable Passive Optical Network
  • NGPON2 asymmetric mode (uplink 10Gbit/s, downlink 10Gbit/s)
  • NGPON2 uplink rate is 10Gbit/s.
  • NGPON2 in PON system can use the same wavelength as XGPON, and achieve coexistence through Time Division Multiple Access (TDMA) technology.
  • TDMA Time Division Multiple Access
  • NGPON2 and XGPON optical network unit (ONU) devices coexist in the network
  • the existing OLT cannot be compatible with the uplink rates of NGPON2 and XGPON at the same time; how to adapt to these two ONU devices is compatible with NGPON2 and XGPON,
  • the cost is lower and the network evolution is smoother, which is a problem that operators and equipment manufacturers have to solve.
  • embodiments of the present invention are directed to provide a passive optical network compatible device, an implementation method thereof, and an optical line terminal, which are compatible with two passive optical networks, NGPON2 and XGPON, so that the passive optical network can smoothly evolve.
  • the embodiment of the present invention provides a passive optical network compatible device, where the device includes: a first uplink burst clock data recovery (BCRD) unit, a second uplink BCDR unit, and a first differential to single terminal.
  • a (SELECTIO) unit a second SELECTIO unit, a downsampling unit, a first uplink path unit, and a second uplink path unit;
  • the first uplink BCDR unit and the second uplink BCDR unit are configured to recover uplink data of the optical network unit ONU by using the first mode and the second mode, and send the restored uplink data to the first SELECTIO unit and the second SELECTIO, respectively. unit;
  • the first SELECTIO unit and the second SELECTIO unit are configured to separately perform differential-to-single-end processing on the received uplink data, and send the converted single-ended data to the first uplink path unit and the down-sampling unit respectively. ;
  • the downsampling unit is configured to downsample the received single-ended data sent by the second SELECTIO unit, and send the downsampled single-ended data to the second uplink path unit;
  • the first uplink path unit is configured to process, by using the first standard, the received single-ended data sent by the first SELECTIO unit; after the demarcation is successful, performing descrambling and forward error correction (FEC, Forward Error Correction) Decoding processing and transmitting the processed Gigabit Passive Optical Network Transmission Convergence (GTC) frame;
  • FEC Forward Error Correction
  • the second uplink path unit is configured to process the received downsampled single-ended data by using a second standard, perform descrambling and FEC decoding processing after the demarcation succeeds, and send the processed GTC frame. .
  • the first uplink BCDR unit is specifically configured to recover uplink data of the ONU by using a lock data mode
  • the second uplink BCDR unit is specifically configured to recover uplink data of the ONU by using a lock clock mode.
  • the first SELECTIO unit and the second SELECTIO unit are specifically configured to perform differential-to-single-end processing on the received uplink data, and recover the clock according to the received uplink data, and keep the converted single-ended data and the clock synchronized.
  • the first uplink path unit includes: an XGDLIM (X Gigabit Upsteam Delimiter) unit, an XGDSC (X Gigabit Upsteam Descramble) unit, and a 10 Gigabit uplink forward direction.
  • Error correction XGUFEC, X Gigabit Upsteam Forward Error Correction
  • the first uplink path unit is further configured to send the first demarcation success information after the demarcation succeeds;
  • the second uplink path unit includes: an Uplink Delimiter (UDLIM) unit, an Upstream Descrambling (UDSC) unit, and an Upsteam Forward Error Correction (UFEC) unit;
  • UDLIM Uplink Delimiter
  • USC Upstream Descrambling
  • UEC Upsteam Forward Error Correction
  • the second uplink path unit is further configured to send the second delimiting success information after the demarcation succeeds;
  • the first standard is a GNPON passive optical network NGPON2 standard
  • the second standard is an asymmetric 10 Gigabit passive optical network XGPON standard.
  • the device further includes: an uplink receiving control unit, configured to acquire the first delimiting success information and the second delimiting success information;
  • the serial number assigned to the ONU (ONU_ID, ONU_Identity), and the TCONT (Transmission Containers) table are bound together and delivered to the ONU;
  • the uplink receiving control unit receives the first delimiting success information and the second delimiting success information at the same time, one of the processing is processed according to a preset processing policy.
  • the embodiment of the invention further provides a method for implementing passive optical network compatibility, the method comprising:
  • the first mode and the second mode are used to restore the uplink data of the ONU, and the recovered uplink data is separately subjected to differential to single-end processing and converted into single-ended data;
  • the single-ended data and the down-sampled single-ended data are respectively processed by using the first standard and the second standard. After the demarcation is successful, the descrambling and FEC decoding processing is performed, and the processed GTC frame is transmitted.
  • the method further includes: sending the delimitation success information after the demarcation succeeds;
  • the ONU rate information corresponding to the ONU, the allocated ONU_ID, and the TCONT table are bound together and delivered to the ONU.
  • the single-ended data recovered by the second mode and subjected to differential-to-single-ended conversion is subjected to down-sampling processing, and converted into down-sampled single-ended data, including:
  • the single-ended data recovered and converted by the second mode is subjected to differential-to-single-end processing, and the received uplink data is restored to internal use, and the converted single-ended data is synchronized with the clock.
  • the first standard is a 10 Gigabit passive optical network NGPON standard
  • the second standard is an asymmetric 10 Gigabit passive optical network XGPON standard
  • the first mode is a lock data mode
  • the second mode is a lock clock mode.
  • the embodiment of the present invention further provides an OLT, wherein the OLT includes: the passive optical network compatible device according to any one of the foregoing aspects.
  • the passive optical network compatible device and the implementation method thereof and the optical line terminal provided by the embodiments of the present invention respectively use the first mode and the second mode to recover the uplink data of the ONU, and perform differential switching single-end processing on the restored uplink data, respectively.
  • the end data and the downsampled single-ended data are processed, and after the demarcation is successful, the descrambling and FEC decoding processing is performed, and the processed GTC frame is sent; it can be seen that two uplink BCRD units are respectively used
  • the two modes are used to recover the uplink data of the ONU, and different single-ended data are separately processed by using different standards in the two paths.
  • the embodiment of the present invention can enable one device to simultaneously meet the transmission requirements of the NGPON2 and XGPON two rate data.
  • the purpose of achieving compatible NGPON2 and XGPON passive optical networks is achieved, so that the passive optical network evolves more smoothly and the cost is lower.
  • FIG. 1 is a schematic structural diagram of a passive optical network compatible device according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of an implementation principle of an exemplary dual rate data processing according to the present invention.
  • FIG. 3 is a schematic diagram of an exemplary dual rate processing two-way authorization process according to the present invention.
  • FIG. 4 is a schematic flowchart diagram of a method for implementing passive optical network compatibility according to an embodiment of the present invention.
  • the uplink data of the ONU is restored by using the first mode and the second mode, respectively, and the recovered uplink data is separately subjected to differential single-ended processing to be converted into single-ended data; and the second mode is restored and converted.
  • the single-ended data is subjected to down-sampling processing and converted into down-sampled single-ended data; the first uplink path and the second uplink path are respectively subjected to different standards to the single-ended number And processing the down-sampled single-ended data, and after the demarcation is successful, performing descrambling and FEC decoding processing, and transmitting the processed GTC frame.
  • the passive optical network compatible device provided by the embodiment of the present invention, as shown in FIG. 1 , includes:
  • the first uplink BCDR unit 11 and the second uplink BCDR unit 12 are configured to recover uplink data of the optical network unit ONU by using different working modes, and send the restored uplink data to the first SELECTIO unit 13 and the second SELECTIO unit, respectively. 14;
  • the uplink data enters the optical module of the OLT in the form of an optical signal, and the optical module converts the uplink data of the optical signal into the uplink data of the electrical signal, and sends the uplink data to the first uplink BCDR unit 11 and The second uplink BCDR unit 12; the first uplink BCDR unit 11 and the second uplink BCDR unit 12 respectively perform recovery of the uplink data by using different working modes.
  • the first uplink BCDR unit 11 can be used to process data satisfying the NGPON2 standard, NGPON2 is a signal of 10 G/s rate, the first uplink BCDR unit 11 needs to be configured in a lock data mode; and the second uplink BCDR unit 12 can be used for processing.
  • the XGPON uplink rate is 2.5 G/s; since the subsequent processing involves the downsampling module, in order to ensure the stability of the sampling clock, the second uplink BCDR unit 12 needs to be configured in a lock clock mode.
  • the first uplink BCDR unit 11 and the second uplink BCDR unit 12 restore the uplink data to the four groups of 16 pairs of differential signal data to the first SELECTIO unit 13 and the second SELECTIO unit 14.
  • the first SELECTIO unit 13 and the second SELECTIO unit 14 are configured to separately perform differential-to-single-end processing on the received uplink data, and send the converted single-ended data to the first uplink path unit 16 and Downsampling unit 15;
  • the first SELECTIO unit 13 and the second SELECTIO unit 14 respectively perform differential-to-single-end processing on the four groups of 16 pairs of differential signal data output by the received first uplink BCDR unit 11 and the second uplink BCDR unit 12;
  • the data is synthesized into 64-bit single-ended data, which are respectively sent to the first uplink path unit 16 and the down-sampling unit 15, and clock recovery is performed according to the differential signal data to keep the data synchronized with the clock.
  • the downsampling unit 15 is configured to downsample the received single-ended data sent by the second SELECTIO unit 14, and send the downsampled single-ended data to the second uplink path unit 17;
  • the downsampling unit 15 performs a downsampling process on the 64-bit single-ended data sent by the second SELECTIO unit 14, and downsamples the 64-bit single-ended data into a single-ended number of 16 bits; thus, 16 The single-ended number of bits can be processed by the second upstream path unit 17.
  • the first uplink path unit 16 is configured to process, by using the first standard, the received single-ended data sent by the first SELECTIO unit 13, and after the demarcation is successful, perform descrambling and FEC decoding processing, and send and process the data. Finished GTC frame;
  • the first uplink path unit 16 can be used to process data of the NGPON2, and the processed data uplink rate is 9.95328 Gbps, the data recovery clock is 155.52 M, and the bit width is 64 bits, which can be used for processing data at a rate of 10 Gbit/s. Also referred to as a 10G path; therefore 64-bit single-ended data processed by the first SELECTIO unit 13 can be sent directly to the first upstream path unit 16 for processing;
  • the first uplink path unit 16 includes: an XGUDLIM unit, an XGUDSC unit, and an XGUFEC unit; the XGUDLIM unit is configured to delimit the single-ended data by using a first standard; and the XGUDSC unit is configured to adopt Decoding the single-ended data by a standard; the XGUFEC unit is configured to perform FEC decoding on the single-ended data by using a first standard.
  • the data processing process of the first uplink path unit 16 is: first to the first The single-ended data sent by the SELECTIO unit 13 is delimited. If the demarcation is successful, the first definite success information is sent, and descrambling and FEC decoding processing is performed, and finally the processed GTC frame is sent; the first criterion is NGPON2 standard.
  • the second uplink path unit 17 is configured to process the received downsampled single-ended data by using a second standard, perform descrambling and FEC decoding processing after the demarcation succeeds, and send the processed GTC. frame;
  • the second uplink path unit 17 can be used to process XGPON data, and the processed data uplink rate is 2.48832 Gbps, and the bit width is 16 bits, which can be used to process 2.5 Gbit/s data, also called 2.5G path. Therefore, the 64-bit single-ended data processed by the second SELECTIO unit 14 needs to be downsampled into 16-bit single-ended data by the downsampling unit 15 before being sent to the second upstream path unit 17 for processing;
  • the second uplink path unit 17 includes: a UDLIM unit, a UDSC unit, and a UFEC unit; the UDLIM unit is configured to delimit the downsampled single-ended data by using a second standard; the UDSC unit, And the descrambling of the downsampled single-ended data by using a second standard, where the UFEC unit is configured to perform FEC decoding on the downsampled single-ended data by using a second standard.
  • the data processing process of the second uplink path unit 17 is: first delimiting the downsampled single-ended data, and if the demarcation is successful, sending the second delimited success information, and performing descrambling and FEC translation Code processing, finally transmitting the processed GTC frame;
  • the second standard is the XGPON standard.
  • the GTC frame sent by the first uplink path unit 16 and the second uplink path unit 17 is subjected to de-frame processing by the subsequent GTC de-frame unit, and the de-framed data is sent to different processing units for processing.
  • the passive optical network compatible device further includes: an uplink receiving control unit 18;
  • the uplink receiving control unit 18 is configured to receive the first uplink path unit 16 and the second The first delimiting success information and the second delimiting success information sent by the uplink path unit 17; determining the ONU rate information according to the first delimiting success information and the second delimiting success information; if the first setting is received
  • the success information of the boundary since the first delimited success information is sent by the first uplink path unit 16, the first uplink path unit 16 processes the data by using the first standard, so that the ONU rate is the first standard; if the first is received,
  • the second delimited success information since the second delimiting success information is sent by the second uplink path unit 17, the second uplink path unit 17 processes the data by using the second standard, thus indicating that the ONU rate is the second standard; here the first standard For the NGPON2 standard, the second standard is the XGPON standard.
  • the ONU rate information may be distinguished by 1 and 0.
  • the ONU rate information of the NGPON2 standard is represented by 1, and the ONU rate information of the XGPON standard
  • the uplink receiving control unit 18 binds the ONU rate information corresponding to the ONU, the sequence number ONU_ID and the TCONT table allocated to the ONU, and sends the ONU through the downlink unit of the OLT to complete the two-way.
  • Authorization If two demarcation success messages are received at the same time, one of them can be processed according to a preset processing strategy; for example, the ONU can be preferentially registered for the NGPON2 standard rate according to the marketing requirement; here, it can be generally The processing strategy preferentially registers the ONU of the NGPON2 standard rate.
  • the implementation principle of dual-rate data processing is shown in Figure 2. It includes: after the uplink data of the ONU is internal to the 2.5G and 10G channels, the delimitation is performed first, according to the uplink data and the delimiter of the 10 Gigabit delimiting module and the delimiting module. Perform cross-correlation operation. When the obtained cross-correlation operation value is within the configured threshold range, it is considered that the delimitation header is found, so that the input data is aligned according to the drift value and sent to the following module for descrambling, solving FEC, GTC solution. Frames are sent to the Traffic Management (TM) module for processing.
  • TM Traffic Management
  • the OLT delivers three uplink overhead physical layer operations management and maintenance (Upstream_Overhead PLOAM, Upstream_Overhead Physical Layer Operations And Maintenance) messages are sent to all ONUs under the OLT PON port; after receiving the ONU, the ONU enters the serial number (SN, Serial Number) state, and the OLT opens a silent window after the waiting time T1, and passes the bandwidth mapping (BWMAP, BandWidth Map) sends an SN request and a half-empty frame; after receiving the SN request, the ONU sends its own SN message; since the uplink has two rates of data together, as shown in step 301: the uplink receiving control unit (URC) Upstream Receive Control) According to the ITU-T G.989.3 protocol, when the ALLOC_ID is 3FD, the two demarcation modules are opened, and the two channels of data enter the 2.5G and 10G channels at the same time; It is the SN message of 10G ONU
  • URC uplink receiving control unit
  • the data enters the 10G delimiter module and the 2.5G delimiter module after downsampling. It can only find the delimiter in the 10G delimiter module. The same 2.5G data can only be found in 2.5.
  • the delimiting module of G finds the delimiter; after receiving the delimited success flag (SYNC) signal given by the delimiting module, the URC will send a rate flag (RATEMODE) to the uplink physical layer operation management.
  • SYNC delimited success flag
  • RATEMODE rate flag
  • the Upstream Physical Layer Operations And Maintenance (UPLOAM) message module if the SYNC signal comes from the 10G delimiting module, the flag bit RATEMODE is 1, otherwise 0; when the software extracts the SN PLOAM message, the rate flag is extracted together.
  • the corresponding ONU_ID is assigned to the ONU at this time, and the ONU enters the ranging state; the operation of the software in assigning the ONU_ID is serial, so there is no second ONU in the ranging state at this time; the ONU is receiving After the ranging request sent by the OLT, the registration (RG, Register) PLOAM message is sent, and the message includes the ONU_ID.
  • the URC binds the RATEMODE, the ONU_ID, and the TCONT table to the ONU, thereby completing the two-way authorization.
  • the ONU completes the activation and starts to enter various service communication, and at the same time starts to register another rate of ONU; therefore, when processing, it is followed by the ONU that first delimits the first registration corresponding rate, when theoretically the two rates of ONU come up at the same time.
  • the ONU of the 10G rate is preferentially registered.
  • the embodiment of the present invention further provides a passive optical network. As shown in FIG. 4, the method includes the following steps:
  • Step 401 Restore the uplink data of the ONU by using the first mode and the second mode, respectively, and performing differential-to-single-end processing respectively, and converting into single-ended data;
  • the uplink data enters the optical module in the form of an optical signal, and the optical module converts the uplink data of the optical signal into the uplink data of the electrical signal; in order to be compatible with the NGPON2 and the XGPON, the first mode and the first mode are respectively adopted.
  • the second mode performs BCDR on the uplink data; the first mode is a lock data mode, and the second mode is a lock clock mode.
  • the data processed by the lock data mode is suitable for subsequent processing by the NGPON2 standard, and the data rate of the NGPON2 is 10 G/s; the data processed by the lock clock mode can ensure the stability of the sampling clock, and is suitable for subsequent processing by the XGPON standard.
  • the rate of XGPON data is 2.5G/s.
  • the uplink data is processed into four groups of 16 pairs of differential signal data by BCDR processing.
  • the four groups of 16 pairs of differential signal data are subjected to differential to single-end processing, the data is synthesized into 64-bit single-ended data, and clock recovery is performed according to the differential signal data, and the recovered clock is used for internal use and maintained.
  • the converted single-ended data is synchronized with the clock.
  • Step 402 Perform down-sampling processing on the single-ended data recovered by the second mode and undergoing differential-to-single-ended conversion, and convert the converted into single-ended data after down-sampling;
  • the single-ended data recovered by the second mode and subjected to differential-to-single-ended processing is suitable for processing according to the XGPON standard;
  • the XGPON uplink rate is 2.48832 Gbps, and the bit width is 16 bits; due to the single-ended processing through the differential-to-single-ended processing
  • the data is 64 bits, so 64-bit single-ended data needs to be downsampled; thus, the downsampled 16-bit single-ended number can be processed according to the XGPON standard.
  • Step 403 The single-ended data and the down-sampled single-ended data are respectively processed by using the first standard and the second standard. After the demarcation is successful, performing descrambling and FEC decoding, and transmitting the processed GTC frame;
  • the received single-ended data is processed by using a first standard, including: first The single-ended data is delimited. If the demarcation is successful, the first definite success information is sent, and the first standard is used for descrambling and FEC decoding processing, and finally the processed GTC frame is sent; the first criterion is NGPON2 standard;
  • the second standard is used to process the received single-ended number of the down-sampled, including: first delimiting the down-sampled single-ended data, and if the demarcation is successful, sending the second delimited success information, and adopting
  • the second standard performs descrambling and FEC decoding processing, and finally transmits the processed GTC frame; the second standard is the XGPON standard.
  • the implementation method of the passive optical network compatible in this embodiment further includes: sending the demarcation success information after the demarcation succeeds; determining the ONU rate information corresponding to the ONU according to the demarcation success information; and the ONU corresponding to the ONU
  • the rate information, the allocated ONU_ID, and the TCONT table are bound together and delivered to the ONU;
  • the first delimiting success information and the second delimiting success information respectively correspond to adopting the first standard delimitation success and adopting the second standard delimitation success, and therefore, if the first delimitation success information is received , indicating that the ONU rate is the first criterion; if the second delimiting success information is received, indicating that the ONU rate is the second standard; where the first standard is the NGPON2 standard and the second standard is the XGPON standard.
  • the ONU rate information corresponding to the ONU and the ONU_ID of the sue are bound to the TCONT table and sent to the ONU through the downlink unit of the OLT to complete the bidirectional authorization. If two demarcation success messages are received at the same time, one of them can be processed according to a preset processing strategy; for example, the ONU can be preferentially registered for the NGPON2 standard rate according to the marketing requirement; here, it can be generally The processing strategy preferentially registers the ONU of the NGPON2 standard rate.
  • the ONU rate information may be distinguished by 1 and 0.
  • the ONU rate information of the NGPON2 standard is represented by 1, and the ONU rate information of the XGPON standard is represented by 0.
  • the embodiment of the invention further provides a passive optical network compatible OLT, and the passive optical network is compatible.
  • the OLT includes not only the optical module, the XGUGEM, the X Gigabit Upstream GPON Encapsulation Mode, the demapping unit, the Dynamic Bandwidth Allocation (DBA) unit, and the 10 Gigabit passive optical network.
  • XGUGTC X Gigabit Upstream GTC
  • XGUPLM XGUPLM, X Gigabit Upstream Power Level Management
  • XGUBIP X Gigabit Upstream Bit Interleaved Parity
  • the device includes: a first uplink BCDR unit 11 and a second uplink, as shown in FIG.
  • XGUDBR passive uplink optical network
  • BCDR unit 12 a BCDR unit 12, a first SELECTIO unit 13, a second SELECTIO unit 14, a downsampling unit 15, a first upstream path unit 16, and a second uplink path unit 17;
  • the first uplink BCDR unit 11 and the second uplink BCDR unit 12 are configured to recover uplink data of the optical network unit ONU by using different working modes, and send the restored uplink data to the first SELECTIO unit 13 and the second SELECTIO unit, respectively. 14;
  • the uplink data enters the optical module of the OLT in the form of an optical signal, and the optical module converts the uplink data of the optical signal into the uplink data of the electrical signal, and sends the uplink data to the first uplink BCDR unit 11 and The second uplink BCDR unit 12; the first uplink BCDR unit 11 and the second uplink BCDR unit 12 respectively perform recovery of the uplink data by using different working modes.
  • the first uplink BCDR unit 11 can be used to process data satisfying the NGPON2 standard, NGPON2 is a signal of 10 G/s rate, the first uplink BCDR unit 11 needs to be configured in a lock data mode; and the second uplink BCDR unit 12 can be used for processing.
  • the XGPON uplink rate is 2.5 G/s; since the subsequent processing involves the downsampling module, in order to ensure the stability of the sampling clock, the second uplink BCDR unit 12 needs to be configured in a lock clock mode.
  • the first uplink BCDR unit 11 and the second uplink BCDR unit 12 restore the uplink data to 4 sets of 16 pairs of differential signal data and send the data to the first SELECTIO list. Element 13 and second SELECTIO unit 14.
  • the first SELECTIO unit 13 and the second SELECTIO unit 14 are configured to separately perform differential-to-single-end processing on the received uplink data, and send the converted single-ended data to the first uplink path unit 16 and Downsampling unit 15;
  • the first SELECTIO unit 13 and the second SELECTIO unit 14 respectively perform differential-to-single-end processing on the four groups of 16 pairs of differential signal data output by the received first uplink BCDR unit 11 and the second uplink BCDR unit 12;
  • the data is synthesized into 64-bit single-ended data, and sent to the first uplink path unit 16 and the downsampling unit 15, respectively, and clock recovery is performed according to the differential signal data, and the recovered clock is used internally, and the single-ended data is maintained. Synchronization with the clock.
  • the downsampling unit 15 is configured to downsample the received single-ended data sent by the second SELECTIO unit 14, and send the downsampled single-ended data to the second uplink path unit 17;
  • the downsampling unit 15 performs a downsampling process on the 64-bit single-ended data sent by the second SELECTIO unit 14, and downsamples the 64-bit single-ended data into a single-ended number of 16 bits; thus, 16 The single-ended number of bits can be processed by the second upstream path unit 17.
  • the first uplink path unit 16 is configured to process, by using the first standard, the received single-ended data sent by the first SELECTIO unit 13, and after the demarcation is successful, perform descrambling and FEC decoding processing, and send and process the data. Finished GTC frame;
  • the first uplink path unit 16 can be used to process data of the NGPON2, and the processed data uplink rate is 9.95328 Gbps, the data recovery clock is 155.52 M, and the bit width is 64 bits, which can be used for processing data at a rate of 10 Gbit/s. Also referred to as a 10G path; therefore 64-bit single-ended data processed by the first SELECTIO unit 13 can be sent directly to the first upstream path unit 16 for processing;
  • the first uplink path unit 16 includes: an XGUDLIM unit, an XGUDSC unit, and an XGUFEC unit; the XGUDLIM unit is configured to delimit the single-ended data by using a first standard; and the XGUDSC unit is configured to adopt Decoding the single-ended data by a standard; the XGUFEC unit is configured to perform FEC decoding on the single-ended data by using a first standard.
  • the data processing process of the first uplink path unit 16 is: first delimiting the single-ended data sent by the first SELECTIO unit 13, and if the demarcation is successful, sending the first demarcation success information and performing descrambling And FEC decoding processing, finally transmitting the processed GTC frame;
  • the first standard is the NGPON2 standard.
  • the second uplink path unit 17 is configured to process the received downsampled single-ended data by using a second standard, perform descrambling and FEC decoding processing after the demarcation succeeds, and send the processed GTC. frame;
  • the second uplink path unit 17 can be used to process XGPON data, and the processed data uplink rate is 2.48832 Gbps, and the bit width is 16 bits, which can be used to process 2.5 Gbit/s data, also called 2.5G path. Therefore, the 64-bit single-ended data processed by the second SELECTIO unit 14 needs to be downsampled by the downsampling unit 15 into a 16-bit single-ended number before being sent to the second upstream path unit 17 for processing;
  • the second uplink path unit 17 includes: a UDLIM unit, a UDSC unit, and a UFEC unit; the UDLIM unit is configured to delimit the downsampled single-ended data by using a second standard; the UDSC unit, And the descrambling of the downsampled single-ended data by using a second standard, where the UFEC unit is configured to perform FEC decoding on the downsampled single-ended data by using a second standard.
  • the data processing process of the second uplink path unit 17 is: first delimiting the downsampled single-ended data, and if the demarcation is successful, sending the second delimited success information, and performing descrambling and FEC translation Code processing, finally transmitting the processed GTC frame;
  • the second standard is the XGPON standard.
  • the GTC frame sent by the first uplink path unit 16 and the second uplink path unit 17 is composed of The subsequent GTC demapping unit performs de-frame processing, and sends the de-framed data to different processing units for processing.
  • the passive optical network compatible device further includes: an uplink receiving control unit 18;
  • the uplink receiving control unit 18 is configured to receive first demarcation success information and second delimiting success information sent by the first uplink path unit 16 and the second uplink path unit 17; according to the first delimiting success information Determining the ONU rate information with the second delimiting success information; if the first delimiting success information is received, since the first delimiting success information is sent by the first uplink path unit 16, the first uplink path unit 16 adopts The first standard processes the data, thus indicating that the ONU rate is the first criterion; if the second delimited success information is received, since the second delimited success information is sent by the second upstream path unit 17, the second upstream path unit 17 The second standard is used to process the data.
  • the ONU rate is the second standard; here the first standard is the NGPON2 standard and the second standard is the XGPON standard.
  • the ONU rate information may be distinguished by 1 and 0.
  • the ONU rate information of the NGPON2 standard is represented by 1
  • the ONU rate information of the XGPON standard is represented by 0.
  • the uplink receiving control unit 18 binds the ONU rate information corresponding to the ONU, the ONU serial number NU_ID and the TCONT table uploaded by the ONU, and sends the ONU to the ONU through the downlink unit of the OLT.
  • Complete two-way authorization If two demarcation success messages are received at the same time, one of them can be processed according to a preset processing strategy; for example, the ONU can be preferentially registered for the NGPON2 standard rate according to the marketing requirement; here, it can be generally The processing strategy preferentially registers the ONU of the NGPON2 standard rate.
  • the embodiment of the invention discloses a passive optical network compatible device and an implementation method thereof and an optical line terminal (OLT).
  • the two uplink BCRD units respectively use two modes to recover the uplink data of the ONU, and in two The path uses different standards to process different single-ended data respectively.
  • the embodiment of the present invention can enable a device to meet the transmission requirements of both NGPON2 and XGPON data rates, and achieve the purpose of compatible with NGPON2 and XGPON passive optical networks. Thereby, the passive optical network evolves more smoothly and the cost is lower.

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Abstract

本发明公开了一种无源光网络兼容装置，分别采用第一模式和第二模式恢复光网络单元(ONU)的上行数据，并对恢复的上行数据分别进行差分转单端处理，转换成单端数据；对所述采用第二模式恢复并经过差分转单端转换的单端数据进行降采样处理，转换成降采样后的单端数据；第一上行通路和第二上行通路采用不同标准分别对所述单端数据和所述降采样后的单端数据进行处理，并在定界成功后，进行解扰和前向纠错(FEC)译码处理，发送处理完的千兆无源光网络传输汇聚(GTC)帧。本发明还同时公开了一种无源光网络兼容的实现方法、光线路终端。

Description

一种无源光网络兼容装置及其实现方法和光线路终端 技术领域
本发明涉及无源光网络(Passive Optical Network，PON)系统传输技术，尤其涉及一种无源光网络兼容装置及其实现方法和光线路终端(Optical Line Terminal，OLT)。
背景技术
近年来，随着全球范围内接入市场的飞快发展以及全业务运营的快速开展，已有的PON技术标准在带宽需求、业务支撑能力，以及接入节点设备和配套设备的性能提升等方面都面临新的升级需求。目前，万兆无源光网络(NGPON，N Gigabit-Capable Passive Optical Network)已经处于商用阶段，NGPON分两个标准：无源光网络(XGPON，X Gigabit-Capable Passive Optical Network)和NGPON2；其中，XGPON为非对称模式(上行2.5Gbit/s，下行10Gbit/s)，对称模式(上行10Gbit/s，下行10Gbit/s)称为NGPON2；NGPON2上行速率为10Gbit/s。考虑到XGPON和NGPON2共存，NGPON2需要同时兼容XGPON模式；目前，PON系统中NGPON2可以和XGPON采用相同的波长，通过时分多址(TDMA，Time Division Multiple Access)技术来实现实现共存。
但是，网络中NGPON2和XGPON两种光网络单元(ONU，Optical Network Unit)设备共存时，现有的OLT无法同时兼容NGPON2和XGPON的上行速率；如何适应这两种ONU设备，兼容NGPON2和XGPON，使成本更低，网络演进更平滑，是运营商及设备生产厂商所要解决的问题。
发明内容
有鉴于此，本发明实施例期望提供一种无源光网络兼容装置及其实现方法和光线路终端，能兼容NGPON2和XGPON两种无源光网络，从而使无源光网络能平滑演进。
为达到上述目的，本发明的技术方案是这样实现的：
本发明实施例提供了一种无源光网络兼容装置，所述装置包括：第一上行突发时钟数据恢复(BCRD，BurstClock and Data Recovery)单元、第二上行BCDR单元、第一差分转单端(SELECTIO)单元、第二SELECTIO单元、降采样单元、第一上行通路单元、第二上行通路单元；其中，
所述第一上行BCDR单元和第二上行BCDR单元，用于采用第一模式和第二模式恢复光网络单元ONU的上行数据，并将恢复的上行数据分别发送到第一SELECTIO单元和第二SELECTIO单元；
所述第一SELECTIO单元和第二SELECTIO单元，用于分别对接收的所述恢复的上行数据进行差分转单端处理，并将转换的单端数据分别发送到第一上行通路单元和降采样单元；
所述降采样单元，用于对接收的所述第二SELECTIO单元发送的单端数据进行降采样，并将降采样后的单端数据发送到所述第二上行通路单元；
所述第一上行通路单元，用于采用第一标准处理接收到的所述第一SELECTIO单元发送的单端数据；在定界成功后，进行解扰和前向纠错(FEC，Forward Error Correction)译码处理，并发送处理完的千兆无源光网络传输汇聚(GTC，GPON Transmission Convergence)帧；
所述第二上行通路单元，用于采用第二标准处理接收到的所述降采样后的单端数据，在定界成功后，进行解扰和FEC译码处理，并发送处理完的GTC帧。
上述方案中，所述第一上行BCDR单元，具体用于采用锁数据模式恢复ONU的上行数据；
所述第二上行BCDR单元，具体用于采用锁时钟模式恢复ONU的上行数据。
上述方案中，所述第一SELECTIO单元和第二SELECTIO单元，具体用于对接收的上行数据进行差分转单端处理，并根据接收的上行数据恢复时钟，保持转换的单端数据与时钟的同步。
上述方案中，所述第一上行通路单元，包括：万兆上行定界(XGUDLIM，X Gigabit Upsteam Delimiter)单元、万兆上行解扰(XGUDSC，X Gigabit Upsteam Descramble)单元、以及万兆上行前向纠错(XGUFEC，X Gigabit Upsteam Forward Error Correction)单元；
所述第一上行通路单元，还用于在定界成功后，发送第一定界成功信息；
所述第二上行通路单元，包括：上行定界(UDLIM，Upstream Delimiter)单元、上行解扰(UDSC，Upstream Descramble)单元、以及上行前向纠错(UFEC，Upsteam Forward Error Correction)单元；
所述第二上行通路单元，还用于在定界成功后，发送第二定界成功信息；
所述第一标准为万兆无源光网络NGPON2标准；
所述第二标准为非对称万兆无源光网络XGPON标准。
上述方案中，所述装置还包括：上行接收控制单元，用于获取所述第一定界成功信息和第二定界成功信息；
根据第一定界成功信息和第二定界成功信息，确定所述ONU速率信息；
根据将所述ONU对应的ONU速率信息、分配给ONU的序列号 (ONU_ID，ONU_Identity)、业务容器(TCONT，Transmission Containers)表绑定在一起并下发给所述ONU；
如果所述上行接收控制单元同时接收到所述第一定界成功信息和第二定界成功信息，则根据预先设定的处理策略先处理其中一个。
本发明实施例还提供了一种无源光网络兼容的实现方法，所述方法包括：
分别采用第一模式和第二模式恢复ONU的上行数据，并对恢复的上行数据分别进行差分转单端处理，转换成单端数据；
对所述采用第二模式恢复并经过差分转单端转换的单端数据进行降采样处理，转换成降采样后的单端数据；
采用第一标准和第二标准分别对所述单端数据和所述降采样后的单端数据进行处理，在定界成功后，进行解扰和FEC译码处理，发送处理完的GTC帧。
上述方案中，所述方法还包括：定界成功后发送定界成功信息；
根据所述定界成功信息，确定所述ONU对应的ONU速率信息；
根据将所述ONU对应的ONU速率信息、分配的ONU_ID、TCONT表绑定在一起并下发给所述ONU。
上述方案中，所述对所述采用第二模式恢复并经过差分转单端转换的单端数据进行降采样处理，转换成降采样后的单端数据，包括：
对采用第二模式恢复并转换的所述单端数据进行差分转单端处理，并将接收的上行数据恢复时钟给内部使用，保持转换的单端数据与时钟的同步。
上述方案中，所述第一标准为万兆无源光网络NGPON标准；
所述第二标准为非对称万兆无源光网络XGPON标准；
所述第一模式为锁数据模式；
所述第二模式为锁时钟模式。
本发明实施例还提供了一种OLT，其中，所述OLT包括：上述方案中任一项所述的无源光网络兼容装置。
本发明实施例所提供的无源光网络兼容装置及其实现方法和光线路终端，分别采用第一模式和第二模式恢复ONU的上行数据，并对恢复的上行数据分别进行差分转单端处理，转换成单端数据；对采用第二模式恢复并转换的单端数据进行降采样处理，转换成降采样后的单端数据；第一上行通路和第二上行通路采用不同标准分别对所述单端数据和所述降采样后的单端数据进行处理，并在定界成功后，进行解扰和FEC译码处理，发送处理完的GTC帧；可以看出，由于采用两个上行BCRD单元分别采用两种模式恢复ONU的上行数据，并在两个通路采用不同标准分别处理不同的单端数据；如此，本发明实施例可使一个装置同时满足NGPON2和XGPON两种速率数据的传输要求，能达到兼容NGPON2和XGPON两种无源光网络的目的，从而使无源光网络演进更平滑，使成本更低。
附图说明
图1为本发明实施例一种无源光网络兼容装置的组成结构示意图；
图2为本发明示例双速率数据处理的实现原理示意图；
图3为本发明示例双速率处理双向授权流程示意图；
图4为本发明实施例一种无源光网络兼容的实现方法的流程示意图。
具体实施方式
本发明实施例中，分别采用第一模式和第二模式恢复ONU的上行数据，并对恢复的上行数据分别进行差分转单端处理，转换成单端数据；对采用第二模式恢复并转换的单端数据进行降采样处理，转换成降采样后的单端数据；第一上行通路和第二上行通路采用不同标准分别对所述单端数 据和所述降采样后的单端数据进行处理，并在定界成功后，进行解扰和FEC译码处理，发送处理完的GTC帧。
下面结合实施例对本发明再作进一步详细的说明。
本发明实施例提供的无源光网络兼容装置，如图1所示，包括：
第一上行BCDR单元11、第二上行BCDR单元12、第一差分转单端(SELECTIO)单元13、第二SELECTIO单元14、降采样单元15、第一上行通路单元16、第二上行通路单元17；其中，
所述第一上行BCDR单元11和第二上行BCDR单元12，用于采用不同工作模式恢复光网络单元ONU的上行数据，并对恢复的上行数据分别发送到第一SELECTIO单元13和第二SELECTIO单元14；
具体的，当ONU向OLT发送上行数据时，上行数据以光信号形式进入OLT的光模块，光模块将光信号的上行数据转换成电信号的上行数据，并发送至第一上行BCDR单元11和第二上行BCDR单元12；第一上行BCDR单元11和第二上行BCDR单元12分别采用不同工作模式完成对所述上行数据的恢复。这里，第一上行BCDR单元11可以用于处理满足NGPON2标准的数据，NGPON2为10G/s速率的信号，第一上行BCDR单元11需要配置成锁数据模式；第二上行BCDR单元12可以用于处理满足XGPON标准的数据，XGPON上行速率为2.5G/s；因为后续处理涉及到降采样模块，为了确保采样时钟的稳定性，第二上行BCDR单元12需要配置成锁时钟模式。这里，第一上行BCDR单元11和第二上行BCDR单元12将上行数据恢复成4组16对的差分信号数据发送到所述第一SELECTIO单元13和第二SELECTIO单元14。
所述第一SELECTIO单元13和第二SELECTIO单元14，用于分别对接收的所述恢复的上行数据进行差分转单端处理，并将转换的单端数据分别发送到第一上行通路单元16和降采样单元15；
具体的，所述第一SELECTIO单元13和第二SELECTIO单元14分别对接收的第一上行BCDR单元11和第二上行BCDR单元12输出的4组16对差分信号数据进行差分转单端处理；将数据合成64比特的单端数据，分别送给第一上行通路单元16和降采样单元15，并且根据所述差分信号数据进行时钟恢复，保持数据与时钟的同步。
所述降采样单元15，用于对接收的所述第二SELECTIO单元14发送的单端数据进行降采样，并将降采样的单端数据发送到所述第二上行通路单元17；
这里，所述降采样单元15对所述第二SELECTIO单元14送出的64比特的单端数据进行降采样处理，将所述64比特的单端数据降采样位16比特的单端数；这样，16比特的单端数可以被所述第二上行通路单元17处理。
所述第一上行通路单元16，用于采用第一标准处理接收到的所述第一SELECTIO单元13发送的单端数据，在定界成功后，进行解扰和FEC译码处理，并发送处理完的GTC帧；
具体的，第一上行通路单元16可以用于处理NGPON2的数据，处理的数据上行速率为9.95328Gbps，数据恢复时钟为155.52M，位宽为64比特，可以用于处理10Gbit/s速率的数据，也称为10G通路；所以经第一SELECTIO单元13处理的64比特单端数据可以直接送到所述第一上行通路单元16进行处理；
所述第一上行通路单元16，包括：XGUDLIM单元、XGUDSC单元、XGUFEC单元；所述XGUDLIM单元，用于采用第一标准对所述单端数据进行定界；所述XGUDSC单元，用于采用第一标准对所述单端数据进行解扰；所述XGUFEC单元，用于采用第一标准对所述单端数据进行FEC解码。所述第一上行通路单元16的数据处理过程为：首先对所述第一 SELECTIO单元13发送的单端数据进行定界，如果定界成功，则发送第一定界成功信息，并进行解扰和FEC译码处理，最后发送处理完的GTC帧；所述第一标准为NGPON2标准。
所述第二上行通路单元17，用于采用第二标准处理接收到的所述降采样后的单端数据，在定界成功后，进行解扰和FEC译码处理，并发送处理完的GTC帧；
具体的，第二上行通路单元17可以用于处理XGPON的数据，处理的数据上行速率为2.48832Gbps，位宽为16比特，可以用于处理2.5Gbit/s速率的数据，也称为2.5G通路；所以经第二SELECTIO单元14处理的64比特的单端数据需要经过所述降采样单元15进行降采样成16比特的单端数据，才可以送到所述第二上行通路单元17进行处理；
所述第二上行通路单元17，包括：UDLIM单元、UDSC单元、UFEC单元；所述UDLIM单元，用于采用第二标准对所述降采样后的单端数据进行定界；所述UDSC单元，用于采用第二标准对所述降采样后的单端数据进行解扰；所述UFEC单元，用于采用第二标准对所述降采样后的单端数据进行FEC解码。所述第二上行通路单元17的数据处理过程为：首先对所述降采样后的单端数据进行定界，如果定界成功，则发送第二定界成功信息，并进行解扰和FEC译码处理，最后发送处理完的GTC帧；所述第二标准为XGPON标准。
所述第一上行通路单元16和第二上行通路单元17发送的GTC帧，由后续的GTC解帧单元进行解帧处理，并将解帧后的数据发送给不同的处理单元进行处理。
本发明实施例提供的无源光网络兼容装置还包括：上行接收控制单元18；
所述上行接收控制单元18，用于接收所述第一上行通路单元16和第二 上行通路单元17通路发送的第一定界成功信息和第二定界成功信息；根据第一定界成功信息和第二定界成功信息确定所述ONU速率信息；如果接收到的是第一定界成功信息，由于第一定界成功信息是由第一上行通路单元16发出，第一上行通路单元16采用第一标准处理数据，如此，表明ONU速率为第一标准；如果接收到的是第二定界成功信息，由于第二定界成功信息是由第二上行通路单元17发出，第二上行通路单元17采用第二标准处理数据，如此，表明ONU速率为第二标准；这里第一标准为NGPON2标准，第二标准为XGPON标准。所述ONU速率信息可以采用1和0区分，NGPON2标准的ONU速率信息用1表示，XGPON标准的ONU速率信息用0表示。
在ONU注册流程中，所述上行接收控制单元18将所述ONU对应的ONU速率信息、分配给ONU的序列号ONU_ID、TCONT表绑定在一起并通过OLT的下行单元发给ONU，来完成双向授权。如果同时收到两个定界成功信息，则可以根据预先设定的处理策略先处理其中一个；比如：可以根据市场推广需求设定处理策略为NGPON2标准速率的ONU优先注册；这里，可以按照通常的处理策略优先注册NGPON2标准速率的ONU。
下面结合具体示例对本发明产生的积极效果作进一步详细的描述。
双速率数据处理的实现原理如图2所示，包括：ONU的上行数据到2.5G和10G通路内部后，先进行定界，根据上行数据和万兆定界模块及定界模块的定界符做互相关运算，当得到的互相关运算值在配置的阈值范围内，则认为找到定界头，从而根据漂移值对输入的数据进行对齐送往后面的模块进行解扰、解FEC、GTC解帧，并送往流量管理(TM，Traffic Management)模块进行处理等。
双速率处理双向授权流程示意图如图3所示，首先OLT下发三个上行开销物理层操作管理和维护(Upstream_Overhead PLOAM， Upstream_Overhead Physical Layer Operations And Maintenance)消息给OLT PON口下所有的ONU；ONU收到后进入序列号(SN，Serial Number)状态，OLT在等待时间T1后开启一个静默窗口，并通过带宽映射(BWMAP，BandWidth Map)下发SN请求和一个半空帧；ONU在收到SN请求后，上发自己的SN消息；由于上行有两种速率的数据一起上来，如步骤301所示：上行接收控制单元(URC，Upstream Receive Control)根据ITU-T G.989.3协议，在ALLOC_ID为3FD的时候，给两路定界模块都进行开窗，两路数据会同时进入2.5G和10G通路中；假设此时上来的是10G ONU的SN消息，数据分别进入10G定界模块、降采样后进入2.5G定界模块，那肯定只能在10G定界模块能找到定界符，同理2.5G数据也只能在2.5G的定界模块找到定界符；URC在收到定界模块给出的定界成功标志(SYNC)信号后，会给出一个速率标志位(RATEMODE)送到上行物理层操作管理和维护(Upstream Physical Layer Operations And Maintenance，UPLOAM)消息模块，如果SYNC信号来自10G定界模块，则标志位RATEMODE为1，否则为0；软件在提取SN PLOAM消息时，将这个速率标志位一并提取，然后分配相应的ONU_ID给此时的ONU，这个ONU则进入测距状态；软件在分配ONU_ID的操作是串行的，所以此时不会有第二个ONU在测距状态；ONU在收到OLT下发的测距请求后，上发注册(RG，Register)PLOAM消息，此消息包含ONU_ID，此时URC将RATEMODE、ONU_ID与TCONT表绑定在一起并下发给ONU，从而完成双向授权，ONU完成激活开始进入各种业务通讯，同时开始注册另外一种速率的ONU；所以，在处理的时候是遵循哪路先定界先注册对应速率的ONU，当理论上两种速率的ONU同时上来则优先注册10G速率的ONU。
基于上述无源光网络兼容装置，本发明实施例还了一种无源光网络兼 容的实现方法，如图4所示，所述方法包括以下几个步骤：
步骤401：分别采用第一模式和第二模式恢复ONU的上行数据，并分别进行差分转单端处理，转换成单端数据；
这里，当所述ONU发送上行数据时，上行数据以光信号形式进入光模块，光模块将光信号的上行数据转换成电信号的上行数据；为了兼容NGPON2和XGPON，分别采用第一模式和第二模式对所述上行数据进行BCDR；所述第一种模式为锁数据模式，第二模式为锁时钟模式。经过所述锁数据模式处理的数据适用于后续以NGPON2标准处理，NGPON2数据的速率为10G/s；经过所述锁时钟模式处理的数据可以确保采样时钟的稳定性，适用于后续以XGPON标准处理，XGPON数据的速率为2.5G/s。这里，所述上行数据经过BCDR处理成为4组16对的差分信号数据。这里，再对所述4组16对差分信号数据进行差分转单端处理，将数据合成64比特的单端数据，并根据差分信号数据进行时钟恢复，所述恢复的时钟用于内部使用，保持转换的单端数据与时钟的同步。
步骤402：对所述采用第二模式恢复并经过差分转单端转换的单端数据进行降采样处理，转换成降采样后的单端数据；
这里，采用第二模式恢复并进行差分转单端处理的所述单端数据适用于按照XGPON标准处理；XGPON上行速率为2.48832Gbps，位宽为16比特；由于经过差分转单端处理的单端数据为64比特，所以需要对64比特的单端数据进行降采样处理；如此，降采样的16比特的单端数可以被按照XGPON标准进行处理。
步骤403：采用第一标准和第二标准分别对单端数据和降采样后的单端数据进行处理；在定界成功后，进行解扰和FEC译码，发送处理完的GTC帧；
具体的，采用第一标准处理接收到的所述单端数据，包括：首先对所 述单端数据进行定界，如果定界成功，则发送第一定界成功信息，并采用第一标准进行解扰和FEC译码处理，最后发送处理完的GTC帧；所述第一标准为NGPON2标准；
采用第二标准处理接收到的所述降采样后的单端数，包括：首先对所述降采样后的单端数据进行定界，如果定界成功，则发送第二定界成功信息，并采用第二标准进行解扰和FEC译码处理，最后发送处理完的GTC帧；所述第二标准为XGPON标准。
本实施例无源光网络兼容的实现方法，还包括：定界成功后发送定界成功信息；根据所述定界成功信息，确定所述ONU对应的ONU速率信息；将所述ONU对应的ONU速率信息、分配的ONU_ID、TCONT表绑定在一起并下发给所述ONU；
具体的，所述第一定界成功信息和第二定界成功信息分别对应于采用第一标准定界成功和采用第二标准定界成功，因此，如果接收到的是第一定界成功信息，则表明所述ONU速率为第一标准；如果接收到的是第二定界成功信息，则表明所述ONU速率为第二标准；这里第一标准为NGPON2标准，第二标准为XGPON标准。
在ONU注册流程中，所述将所述ONU对应的ONU速率信息和所诉分配的ONU_ID与TCONT表绑定在一起并通过OLT的下行单元发给ONU，来完成双向授权。如果同时收到两个定界成功信息，则可以根据预先设定的处理策略先处理其中一个；比如：可以根据市场推广需求设定处理策略为NGPON2标准速率的ONU优先注册；这里，可以按照通常的处理策略优先注册NGPON2标准速率的ONU。所述ONU速率信息可以采用1和0区分，NGPON2标准的ONU速率信息用1表示，XGPON标准的ONU速率信息用0表示。
本发明实施例还了一种无源光网络兼容的OLT，所述无源光网络兼容 的OLT不但包括：光模块、万兆无源光网络封装方式(XGUGEM，X Gigabit Upstream GPON Encapsulation Mode)解帧单元、带宽动态分配(DBA，Dynamic Bandwidth Allocation，DBA)单元、万兆无源光网络传输汇聚(XGUGTC，X Gigabit Upstream GTC)单元、万兆上行功率电平调整XGUPLM(XGUPLM，X Gigabit Upstream Power Level Management)、万兆上行帧定界符(XGUBIP，X Gigabit Upstream Bit Interleaved Parity)、万兆上行动态宽带报告(XGUDBR，X Gigabit Upstream Dynamic Bandwidth Report)、下行数据部分；还包括无源光网络兼容装置，如图1所示，所述装置包括：第一上行BCDR单元11、第二上行BCDR单元12、第一SELECTIO单元13、第二SELECTIO单元14、降采样单元15、第一上行通路单元16、第二上行通路单元17；其中，
所述第一上行BCDR单元11和第二上行BCDR单元12，用于采用不同工作模式恢复光网络单元ONU的上行数据，并将恢复的上行数据分别发送到第一SELECTIO单元13和第二SELECTIO单元14；
具体的，当ONU向OLT发送上行数据时，上行数据以光信号形式进入OLT的光模块，光模块将光信号的上行数据转换成电信号的上行数据，并发送至第一上行BCDR单元11和第二上行BCDR单元12；第一上行BCDR单元11和第二上行BCDR单元12分别采用不同工作模式完成对所述上行数据的恢复。这里，第一上行BCDR单元11可以用于处理满足NGPON2标准的数据，NGPON2为10G/s速率的信号，第一上行BCDR单元11需要配置成锁数据模式；第二上行BCDR单元12可以用于处理满足XGPON标准的数据，XGPON上行速率为2.5G/s；因为后续处理涉及到降采样模块，为了确保采样时钟的稳定性，第二上行BCDR单元12需要配置成锁时钟模式。这里，第一上行BCDR单元11和第二上行BCDR单元12将上行数据恢复成4组16对的差分信号数据发送到所述第一SELECTIO单 元13和第二SELECTIO单元14。
所述第一SELECTIO单元13和第二SELECTIO单元14，用于分别对接收的所述恢复的上行数据进行差分转单端处理，并将转换的单端数据分别发送到第一上行通路单元16和降采样单元15；
具体的，所述第一SELECTIO单元13和第二SELECTIO单元14分别对接收的第一上行BCDR单元11和第二上行BCDR单元12输出的4组16对差分信号数据进行差分转单端处理；将数据合成64比特的单端数据，分别送给第一上行通路单元16和降采样单元15，并根据所述差分信号数据进行时钟恢复，将恢复的时钟给内部使用，并保持所述单端数据与时钟的同步。
所述降采样单元15，用于对接收的所述第二SELECTIO单元14发送的单端数据进行降采样，并将降采样的单端数据发送到所述第二上行通路单元17；
这里，所述降采样单元15对所述第二SELECTIO单元14送出的64比特的单端数据进行降采样处理，将所述64比特的单端数据降采样位16比特的单端数；这样，16比特的单端数可以被所述第二上行通路单元17处理。
所述第一上行通路单元16，用于采用第一标准处理接收到的所述第一SELECTIO单元13发送的单端数据，在定界成功后，进行解扰和FEC译码处理，并发送处理完的GTC帧；
具体的，第一上行通路单元16可以用于处理NGPON2的数据，处理的数据上行速率为9.95328Gbps，数据恢复时钟为155.52M，位宽为64比特，可以用于处理10Gbit/s速率的数据，也称为10G通路；所以经第一SELECTIO单元13处理的64比特单端数据可以直接送到所述第一上行通路单元16进行处理；
所述第一上行通路单元16，包括：XGUDLIM单元、XGUDSC单元、XGUFEC单元；所述XGUDLIM单元，用于采用第一标准对所述单端数据进行定界；所述XGUDSC单元，用于采用第一标准对所述单端数据进行解扰；所述XGUFEC单元，用于采用第一标准对所述单端数据进行FEC解码。所述第一上行通路单元16的数据处理过程为：首先对所述第一SELECTIO单元13发送的单端数据进行定界，如果定界成功，则发送第一定界成功信息，并进行解扰和FEC译码处理，最后发送处理完的GTC帧；所述第一标准为NGPON2标准。
所述第二上行通路单元17，用于采用第二标准处理接收到的所述降采样后的单端数据，在定界成功后，进行解扰和FEC译码处理，并发送处理完的GTC帧；
具体的，第二上行通路单元17可以用于处理XGPON的数据，处理的数据上行速率为2.48832Gbps，位宽为16比特，可以用于处理2.5Gbit/s速率的数据，也称为2.5G通路；所以经第二SELECTIO单元14处理的64比特的单端数据需要经过所述降采样单元15进行降采样成16比特的单端数才可以送到所述第二上行通路单元17进行处理；
所述第二上行通路单元17，包括：UDLIM单元、UDSC单元、UFEC单元；所述UDLIM单元，用于采用第二标准对所述降采样后的单端数据进行定界；所述UDSC单元，用于采用第二标准对所述降采样后的单端数据进行解扰；所述UFEC单元，用于采用第二标准对所述降采样后的单端数据进行FEC解码。所述第二上行通路单元17的数据处理过程为：首先对所述降采样后的单端数据进行定界，如果定界成功，则发送第二定界成功信息，并进行解扰和FEC译码处理，最后发送处理完的GTC帧；所述第二标准为XGPON标准。
所述第一上行通路单元16和第二上行通路单元17发送的GTC帧，由 后续的GTC解帧单元进行解帧处理，并将解帧后的数据发送给不同的处理单元进行处理。
本发明实施例提供的无源光网络兼容装置还包括：上行接收控制单元18；
所述上行接收控制单元18，用于接收所述第一上行通路单元16和第二上行通路单元17通路发送的第一定界成功信息和第二定界成功信息；根据第一定界成功信息和第二定界成功信息确定所述ONU速率信息；如果接收到的是第一定界成功信息，由于第一定界成功信息是由第一上行通路单元16发出，第一上行通路单元16采用第一标准处理数据，如此，表明ONU速率为第一标准；如果接收到的是第二定界成功信息，由于第二定界成功信息是由第二上行通路单元17发出，第二上行通路单元17采用第二标准处理数据，如此，表明ONU速率为第二标准；这里第一标准为NGPON2标准，第二标准为XGPON标准。所述ONU速率信息可以采用1和0区分，NGPON2标准的ONU速率信息用1表示，XGPON标准的ONU速率信息用0表示。
在ONU注册流程中，所述上行接收控制单元18将所述ONU对应的ONU速率信息、所述ONU上传的ONU序列号NU_ID、TCONT表绑定在一起并通过OLT的下行单元发给ONU，来完成双向授权。如果同时收到两个定界成功信息，则可以根据预先设定的处理策略先处理其中一个；比如：可以根据市场推广需求设定处理策略为NGPON2标准速率的ONU优先注册；这里，可以按照通常的处理策略优先注册NGPON2标准速率的ONU。
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，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。
工业实用性
本发明实施例公开了一种无源光网络兼容装置及其实现方法和光线路终端(Optical Line Terminal，OLT)，采用两个上行BCRD单元分别采用两种模式恢复ONU的上行数据，并在两个通路采用不同标准分别处理不同的单端数据；如此，本发明实施例可使一个装置同时满足NGPON2和XGPON两种速率数据的传输要求，能达到兼容NGPON2和XGPON两种无源光网络的目的，从而使无源光网络演进更平滑，使成本更低。

Claims (10)

  1. 一种无源光网络兼容装置，所述装置包括：第一上行突发时钟数据恢复BCDR单元、第二上行BCDR单元、第一差分转单端SELECTIO单元、第二SELECTIO单元、降采样单元、第一上行通路单元、第二上行通路单元；其中，
    所述第一上行BCDR单元和第二上行BCDR单元，配置为采用第一模式和第二模式恢复光网络单元ONU的上行数据，并将恢复的上行数据分别发送到第一SELECTIO单元和第二SELECTIO单元；
    所述第一SELECTIO单元和第二SELECTIO单元，配置为分别对接收的所述恢复的上行数据进行差分转单端处理，并将转换的单端数据分别发送到第一上行通路单元和降采样单元；
    所述降采样单元，配置为对接收的所述第二SELECTIO单元发送的单端数据进行降采样，并将降采样后的单端数据发送到所述第二上行通路单元；
    所述第一上行通路单元，配置为采用第一标准处理接收到的所述第一SELECTIO单元发送的单端数据；在定界成功后，进行解扰和前向纠错FEC译码处理，并发送处理完的千兆无源光网络传输汇聚GTC帧；
    所述第二上行通路单元，配置为采用第二标准处理接收到的所述降采样后的单端数据，在定界成功后，进行解扰和FEC译码处理，并发送处理完的GTC帧。
  2. 根据权利要求1所述的装置，其中，
    所述第一上行BCDR单元，配置为采用锁数据模式恢复ONU的上行数据；
    所述第二上行BCDR单元，配置为采用锁时钟模式恢复ONU的上行数 据。
  3. 根据权利要求1所述的装置，其中，
    所述第一SELECTIO单元和第二SELECTIO单元，配置为对接收的上行数据进行差分转单端处理，并根据接收的上行数据恢复时钟，保持转换的单端数据与时钟的同步。
  4. 根据权利要求1所述的装置，其中，
    所述第一上行通路单元，包括：万兆上行定界XGUDLIM单元、万兆上行解扰XGUDSC单元、以及万兆上行前向纠错XGUFEC单元；
    所述第一上行通路单元，配置为在定界成功后，发送第一定界成功信息；
    所述第二上行通路单元，包括：上行定界UDLIM单元、上行解扰UDSC单元、以及上行前向纠错UFEC单元；
    所述第二上行通路单元，配置为在定界成功后，发送第二定界成功信息；
    所述第一标准为万兆无源光网络NGPON2标准；
    所述第二标准为非对称万兆无源光网络XGPON标准。
  5. 根据权利要求4所述的装置，其中，所述装置还包括：上行接收控制单元，配置为获取所述第一定界成功信息和第二定界成功信息；
    根据第一定界成功信息和第二定界成功信息，确定所述ONU速率信息；
    根据将所述ONU对应的ONU速率信息、分配给ONU的序列号ONU_ID、业务容器TCONT表绑定在一起并下发给所述ONU；
    如果所述上行接收控制单元同时接收到所述第一定界成功信息和第二定界成功信息，则根据预先设定的处理策略先处理其中一个。
  6. 一种无源光网络兼容的实现方法，所述方法包括：
    分别采用第一模式和第二模式恢复ONU的上行数据，并对恢复的上行数据分别进行差分转单端处理，转换成单端数据；
    对所述采用第二模式恢复并经过差分转单端转换的单端数据进行降采样处理，转换成降采样后的单端数据；
    采用第一标准和第二标准分别对所述单端数据和所述降采样后的单端数据进行处理，在定界成功后，进行解扰和FEC译码处理，发送处理完的GTC帧。
  7. 根据权利要求6所述的方法，其中，所述方法还包括：
    定界成功后发送定界成功信息；
    根据所述定界成功信息，确定所述ONU对应的ONU速率信息；
    根据将所述ONU对应的ONU速率信息、分配的ONU_ID、TCONT表绑定在一起并下发给所述ONU。
  8. 根据权利要求6所述的方法，其中，所述对所述采用第二模式恢复并经过差分转单端转换的单端数据进行降采样处理，转换成降采样后的单端数据，包括：
    对采用第二模式恢复并转换的所述单端数据进行差分转单端处理，并将接收的上行数据恢复时钟给内部使用，保持转换的单端数据与时钟的同步。
  9. 根据权利要求6至8任一项所述的方法，其中，
    所述第一标准为万兆无源光网络NGPON标准；
    所述第二标准为非对称万兆无源光网络XGPON标准；
    所述第一模式为锁数据模式；
    所述第二模式为锁时钟模式。
  10. 一种光线路终端OLT，其中，所述OLT包括：权利要求1至5任一项所述的无源光网络兼容装置。
PCT/CN2016/100938 2015-12-10 2016-09-29 一种无源光网络兼容装置及其实现方法和光线路终端 WO2017097020A1 (zh)

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