CN106878834B - Passive optical network compatible device and implementation method thereof and optical line terminal - Google Patents
Passive optical network compatible device and implementation method thereof and optical line terminal Download PDFInfo
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- CN106878834B CN106878834B CN201510919447.3A CN201510919447A CN106878834B CN 106878834 B CN106878834 B CN 106878834B CN 201510919447 A CN201510919447 A CN 201510919447A CN 106878834 B CN106878834 B CN 106878834B
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Abstract
The invention discloses a passive optical network compatible device, which recovers uplink data of an Optical Network Unit (ONU) by adopting a first mode and a second mode respectively, and performs differential to single-ended conversion processing on the recovered uplink data respectively to convert the recovered uplink data into single-ended data; performing down-sampling processing on the single-ended data which is recovered by adopting the second mode and is subjected to differential to single-ended conversion, and converting the single-ended data into down-sampled single-ended data; and the first uplink path and the second uplink path adopt different standards to respectively process the single-ended data and the single-ended data after down sampling, perform descrambling and Forward Error Correction (FEC) decoding processing after the delimiting is successful, and send the processed gigabit passive optical network transmission convergence (GTC) frame. The invention also discloses a method for realizing the passive optical network compatibility and an optical line terminal.
Description
Technical Field
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 (Optical L ine Terminal, O L T).
Background
In recent years, with the rapid development of the global access market and the rapid development of the full-service operation, the existing PON technical standard faces new upgrading requirements in the aspects of bandwidth requirement, service supporting capability, performance improvement of access node equipment and supporting equipment, and the like. At present, a Gigabit-Capable passive optical Network (NGPON) is already in a commercial stage, and the NGPON has two standards: passive Optical networks (XGPON, X Gigabit-Capable Passive Optical Network) and NGPON 2; wherein, the XGPON is in an asymmetric mode (uplink 2.5Gbit/s and downlink 10Gbit/s), and the symmetric mode (uplink 10Gbit/s and downlink 10Gbit/s) is called as NGPON 2; the uplink rate of the NGPON2 is 10 Gbit/s. Considering that XGPON and NGPON2 coexist, NGPON2 needs to be compatible with XGPON mode at the same time; at present, NGPON2 in the PON system may use the same wavelength as XGPON, and implement coexistence by Time Division Multiple Access (TDMA) technology.
However, when two Optical Network Unit (ONU) devices, NGPON2 and XGPON coexist in the Network, the existing O L T cannot be compatible with the uplink rates of NGPON2 and XGPON at the same time, and how to adapt to the two ONU devices and to be compatible with NGPON2 and XGPON makes the cost lower and the Network evolution smoother, which is a problem to be solved by operators and device manufacturers.
Disclosure of Invention
In view of this, embodiments of the present invention are expected 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, i.e., NGPON2 and XGPON, so that the passive optical networks can evolve smoothly.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a passive optical network compatible device which comprises a first uplink burst clock Data Recovery (BCRD) unit, a second uplink BCDR unit, a first differential-to-single-ended (SE L ECTIO) unit, a second SE L ECTIO unit, a down-sampling unit, a first uplink channel unit and a second uplink channel unit, wherein,
the first uplink BCDR unit and the second uplink BCDR unit are used for recovering uplink data of the optical network unit ONU by adopting a first mode and a second mode and respectively sending the recovered uplink data to a first SE L ECTIO unit and a second SE L ECTIO unit;
the first SE L ECTIO unit and the second SE L ECTIO unit are used for respectively carrying out differential-to-single-ended conversion on the received recovered uplink data and respectively sending the converted single-ended data to the first uplink channel unit and the down-sampling unit;
the down-sampling unit is configured to down-sample the received single-ended data sent by the second SE L ECTIO unit, and send the down-sampled single-ended data to the second uplink path unit;
the first uplink access unit is used for processing the received single-ended data sent by the first SE L ECTIO unit by adopting a first standard, performing descrambling and Forward Error Correction (FEC) decoding processing after the delimiting is successful, and sending a processed gigabit passive optical network transmission convergence (GTC) frame;
and the second uplink path unit is used for processing the received single-ended data subjected to the down sampling by adopting a second standard, performing descrambling and FEC decoding processing after the delimitation is successful, and sending the processed GTC frame.
In the above scheme, the first uplink BCDR unit is specifically configured to recover uplink data of the ONU using a data-locking mode;
and the second uplink BCDR unit is specifically used for recovering uplink data of the ONU by adopting a lock clock mode.
In the above scheme, the first SE L ECTIO cell and the second SE L ECTIO cell are specifically configured to perform differential to single-ended conversion processing on received uplink data, recover a clock according to the received uplink data, and keep synchronization between the converted single-ended data and the clock.
In the scheme, the first uplink access unit comprises a trillion uplink delimitation (XGDU L IM, X Gigabit uplink Delimiter) unit, a trillion uplink descrambling (XGDSC, X Gigabit uplink Description) unit and a trillion uplink Forward Error Correction (XGDUFEC, X Gigabit uplink Forward Error Correction) unit;
the first uplink access unit is also used for sending first delimiting success information after delimiting succeeds;
the second uplink channel unit comprises an uplink delimitation (UD L IM, Upstream delimitator) unit, an uplink descrambling (UDSC, Upstream Descriptramble) unit and an Uplink Forward Error Correction (UFEC) unit;
the second uplink access unit is also used for sending second delimitation success information after delimitation succeeds;
the first standard is a gigabit passive optical network (NGPON) 2 standard;
the second standard is an asymmetric gigabit passive optical network XGPON standard.
In the above scheme, the apparatus further comprises: the uplink receiving control unit is used for acquiring the first delimiting success information and the second delimiting success information;
determining the ONU rate information according to the first delimiting success information and the second delimiting success information;
binding the ONU rate information corresponding to the ONU, serial number (ONU _ ID, ONU _ Identity) allocated to the ONU and a service container (TCONT, Transmission Containers) table together and sending the bound ONU to the ONU;
and if the uplink receiving control unit receives the first delimiting success information and the second delimiting success information at the same time, processing one of the information according to a preset processing strategy.
The embodiment of the invention also provides a method for realizing the passive optical network compatibility, which comprises the following steps:
respectively adopting a first mode and a second mode to recover uplink data of the ONU, and respectively carrying out differential-to-single-ended conversion on the recovered uplink data to convert the recovered uplink data into single-ended data;
performing down-sampling processing on the single-ended data which is recovered by adopting the second mode and is subjected to differential to single-ended conversion, and converting the single-ended data into down-sampled single-ended data;
and respectively processing the single-ended data and the downsampled single-ended data by adopting a first standard and a second standard, descrambling and FEC decoding after the delimiting is successful, and sending the processed GTC frame.
In the above scheme, the method further comprises: sending successful delimitation information after delimitation is successful;
determining ONU rate information corresponding to the ONU according to the delimiting success information;
and binding the ONU rate information corresponding to the ONU, the distributed ONU _ ID and the TCONT table together and sending the bound ONU rate information, the distributed ONU _ ID and the TCONT table to the ONU.
In the foregoing scheme, the down-sampling the single-ended data restored in the second mode and subjected to the differential-to-single-ended conversion, and converting the single-ended data into the down-sampled single-ended data includes:
and carrying out differential to single-ended conversion on the single-ended data which is recovered and converted by adopting the second mode, recovering a clock for internal use from the received uplink data, and keeping the synchronization of the converted single-ended data and the clock.
In the above scheme, the first standard is a gigabit passive optical network NGPON standard;
the second standard is an asymmetric 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 invention also provides O L T, which is characterized in that the O L T comprises the passive optical network compatible device in any one of the schemes.
The passive optical network compatible device, the implementation method thereof and the optical line terminal provided by the embodiment of the invention recover the uplink data of the ONU by adopting the first mode and the second mode respectively, and perform differential to single-ended conversion processing on the recovered uplink data respectively to convert the recovered uplink data into single-ended data; performing down-sampling processing on the single-ended data which is recovered and converted by adopting the second mode, and converting the single-ended data into down-sampled single-ended data; the first uplink path and the second uplink path adopt different standards to respectively process the single-ended data and the single-ended data after down sampling, and after the delimitation is successful, descrambling and FEC decoding are carried out, and the processed GTC frame is sent; it can be seen that two uplink BCRD units are adopted to recover uplink data of the ONU respectively in two modes, and different single-ended data are respectively processed in two channels by adopting different standards; therefore, the embodiment of the invention can enable one device to simultaneously meet the transmission requirements of the NGPON2 and XGPON data at two rates, and can achieve the purpose of being compatible with the NGPON2 and XGPON passive optical networks, thereby enabling the evolution of the passive optical networks to be smoother and the cost to be lower.
Drawings
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 exemplary dual rate data processing implementation of the present invention;
FIG. 3 is a schematic diagram of an exemplary dual rate processing bi-directional grant flow of the present invention;
fig. 4 is a flowchart illustrating a method for implementing passive optical network compatibility according to an embodiment of the present invention.
Detailed Description
In the embodiment of the invention, the first mode and the second mode are respectively adopted to recover the uplink data of the ONU, and the recovered uplink data is respectively subjected to differential-to-single-ended conversion processing and converted into single-ended data; performing down-sampling processing on the single-ended data which is recovered and converted by adopting the second mode, and converting the single-ended data into down-sampled single-ended data; and the first uplink path and the second uplink path adopt different standards to respectively process the single-ended data and the single-ended data after the down sampling, and after the delimiting is successful, descrambling and FEC decoding are carried out, and the processed GTC frame is sent.
The present invention will be described in further detail with reference to examples.
As shown in fig. 1, the passive optical network compatible device provided in the embodiment of the present invention includes:
a first uplink BCDR unit 11, a second uplink BCDR unit 12, a first differential-to-single end (SE L ECTIO) unit 13, a second SE L ECTIO unit 14, a down-sampling unit 15, a first uplink unit 16, a second uplink 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 using different working modes, and send the recovered uplink data to the first SE L ECTIO unit 13 and the second SE L ECTIO unit 14, respectively;
specifically, when the ONU transmits upstream data to the O L T, the upstream data enters an optical module of the O L T in the form of an optical signal, the optical module converts the upstream data of the optical signal into upstream data of an electrical signal and transmits the upstream data to the first upstream BCDR unit 11 and the second upstream BCDR unit 12, the first upstream BCDR unit 11 and the second upstream BCDR unit 12 respectively adopt different working modes to complete recovery of the upstream data, here, the first upstream BCDR unit 11 can be used for processing data meeting NGPON2 standards, the NGPON2 is a signal with a 10G/s rate, the first upstream BCDR unit 11 needs to be configured in a lock data mode, the second upstream BCDR unit 12 can be used for processing data meeting XGPON standards, the XGPON upstream rate is 2.5G/s, since subsequent processing involves a down-sampling module, in order to ensure stability of a sampling clock, the second upstream BCDR unit 12 needs to be configured in a lock clock mode, here, the first upstream BCDR unit 11 and the second upstream BCDR unit 12 recover the ectpon data into a differential signal 16 for transmitting the ECTIO 13 and the second upstream bcse 3614.
The first SE L ECTIO unit 13 and the second SE L ECTIO unit 14 are configured to perform differential-to-single-ended conversion processing on the received recovered uplink data, and send the converted single-ended data to the first uplink path unit 16 and the down-sampling unit 15, respectively;
specifically, the first SE L ECTIO unit 13 and the second SE L ECTIO unit 14 perform differential-to-single-ended conversion on the received 4 groups 16 of differential signal data output by the first uplink BCDR unit 11 and the second uplink BCDR unit 12, synthesize the data into 64-bit single-ended data, send the 64-bit single-ended data to the first uplink channel unit 16 and the down-sampling unit 15, perform clock recovery according to the differential signal data, and maintain synchronization between the data and the clock.
The down-sampling unit 15 is configured to down-sample the received single-ended data sent by the second SE L ECTIO unit 14, and send the down-sampled single-ended data to the second uplink unit 17;
here, the down-sampling unit 15 down-samples the 64-bit single-ended data sent by the second SE L ECTIO unit 14, and down-samples the 64-bit single-ended data into a 16-bit single-ended number, so that the 16-bit single-ended number can be processed by the second up-path unit 17.
The first uplink path unit 16 is configured to process the received single-ended data sent by the first SE L ECTIO unit 13 by using a first standard, perform descrambling and FEC decoding processing after the delimiting is successful, and send a GTC frame that is processed;
specifically, the first uplink path unit 16 may be configured to process data of the NGPON2, where the uplink rate of the processed data is 9.95328Gbps, the data recovery clock is 155.52M, the bit width is 64 bits, and the data may be configured to process data of 10Gbit/s rate, which is also referred to as a 10G path;
the first uplink access unit 16 comprises an XGDU L IM unit, an XGDSC unit and an XGDU EC unit, wherein the XGDU L IM unit is used for delimiting the single-ended data by adopting a first standard, the XGDSC unit is used for descrambling the single-ended data by adopting the first standard, the XGDU FEC unit is used for FEC decoding the single-ended data by adopting the first standard, the data processing process of the first uplink access unit 16 comprises the steps of firstly delimiting the single-ended data sent by the first SE L ECTIO unit 13, if the delimitation is successful, sending first delimiting success information, descrambling and decoding, and finally sending the finished GTC frame, and the first standard is the NGPON2 standard.
The second uplink path unit 17 is configured to process the received single-ended data after down sampling by using a second standard, perform descrambling and FEC decoding after the delimiting is successful, and send a GTC frame after the descrambling and FEC decoding is completed;
specifically, the second uplink path unit 17 may be configured to process XGPON data, where an uplink rate of the processed data is 2.48832Gbps, a bit width is 16 bits, and the second uplink path unit may be configured to process 2.5Gbit/s data, which is also referred to as a 2.5G path, so that 64-bit single-ended data processed by the second SE L ECTIO unit 14 may be sent to the second uplink path unit 17 for processing only after being down-sampled by the down-sampling unit 15 to be 16-bit single-ended data;
the second uplink access unit 17 comprises a UD L IM unit, a UDSC unit and a UFEC unit, wherein the UD L IM unit is used for delimiting the single-ended data after the down-sampling by adopting a second standard, the UDSC unit is used for descrambling the single-ended data after the down-sampling by adopting the second standard, the UFEC unit is used for FEC decoding the single-ended data after the down-sampling by adopting the second standard, the data processing process of the second uplink access unit 17 comprises the steps of firstly delimiting the single-ended data after the down-sampling, if the delimitation is successful, sending second delimiting success information, descrambling and FEC decoding, and finally sending the GTC frame after the processing, and the second standard is the XGPON standard.
The GTC frames sent by the first uplink path unit 16 and the second uplink path unit 17 are deframed by the subsequent GTC deframing unit, and send the deframed data to different processing units for processing.
The passive optical network compatible device provided by the embodiment of the invention further comprises: an uplink reception control unit 18;
the uplink receiving control unit 18 is configured to receive first delimiting success information and second delimiting success information sent by the first uplink access unit 16 and the second uplink access unit 17; determining the ONU rate information according to the first delimiting success information and the second delimiting success information; if the received first boundary success information is the first boundary success information, the first uplink access unit 16 processes data by adopting the first standard because the first boundary success information is sent by the first uplink access unit 16, and thus, the ONU rate is the first standard; if the received second delimiting success information is the second delimiting success information, the second upstream access unit 17 processes data by adopting the second standard because the second delimiting success information is sent by the second upstream access unit 17, thus indicating that 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, and 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.
In the ONU registration process, the uplink receiving control unit 18 binds the ONU rate information corresponding to the ONU, the serial number ONU _ ID allocated to the ONU and the TCONT table together and sends the information to the ONU through the downlink unit of O L T to complete the bidirectional authorization, if two pieces of successful delimitation information are received simultaneously, one of the two pieces of successful delimitation information can be processed firstly according to a preset processing strategy, for example, the ONU with the processing strategy of the NGPON2 standard rate can be set according to the market promotion requirement for preferential registration, and the ONU with the NGPON2 standard rate can be preferentially registered according to the common processing strategy.
The positive effects produced by the present invention will be described in further detail with reference to specific examples.
The principle of implementation of dual-rate data processing is shown in fig. 2, and includes: and after the uplink data of the ONU reaches the inside of 2.5G and 10G channels, delimitation is firstly carried out, cross-correlation operation is carried out according to the uplink data, the tera delimitation module and delimitation symbols of the delimitation module, and when the obtained cross-correlation operation value is within the range of a configured threshold value, a delimitation head is considered to be found, so that the input data is aligned according to the drift value and is sent to the following module for descrambling, FEC decoding and GTC decoding, and is sent to a Traffic Management (TM) module for processing and the like.
The dual-rate processing bidirectional authorization flow diagram is as shown in fig. 3, firstly, an O L T issues three uplink Overhead Physical layer operation management And Maintenance (Upstream _ Overhead P L OAM, Upstream _ Overhead Physical layer L a layer Operations And Maintenance) messages to all ONUs under an O L T PON, the ONU enters a Serial Number (SN) state after receiving the SN, the O L T opens a silent window after waiting time T1, And issues a SN request And a semi-empty frame through BandWidth mapping (BWMAP), the ONU sends its SN message after receiving the SN request, And as the uplink has two rates together, as shown in step 301, an uplink reception Control unit (URC, upstreamreceivecontrol Control) performs uplink reception Control (uplongitudinally receive Control) according to ITU-T g.989.3 protocol when a 56jd is 3, the uplink reception Control unit (URC, upc, uplongitudinally receive Control) And performs uplink reception Control (upc, uplongitudinally receive a sequence registration Control) message when a delimiter is 3, the upc is a delimiter 2, the ONU starts to Register the uplink Overhead operation management message And send a corresponding Serial Number corresponding to a corresponding mac 2 when the ONU starts to a corresponding mac 2, the ONU starts to Register the ONU, if the ONU, the ONU starts to receive a corresponding Serial Number of the ONU, the ONU starts to Register a corresponding Serial Number reaches a delimiter 2, the ONU 10, And the ONU module, if the ONU starts to Register a corresponding ONU, the ONU starts to Register a corresponding ONU, the ONU can only starts to obtain a corresponding ONU, the ONU can only starts to obtain a delimiter 2, the ONU can only start a mac 2, the ONU can only start a mac module can only start a mac 2, the ONU can only start a mac module can only start a mac 2, the ONU.
Based on the above passive optical network compatible device, an embodiment of the present invention further provides a method for implementing passive optical network compatibility, as shown in fig. 4, where the method includes the following steps:
step 401: recovering uplink data of the ONU by adopting a first mode and a second mode respectively, and performing differential-to-single-ended conversion processing respectively to convert the uplink data into single-ended data;
here, when the ONU transmits the upstream data, the upstream data enters the optical module in the form of an optical signal, and the optical module converts the upstream data of the optical signal into upstream data of an electrical signal; in order to be compatible with NGPON2 and XGPON, performing BCDR on the uplink data by adopting a first mode and a second mode respectively; the first mode is a data-locked mode, and the second mode is a clock-locked mode. The data processed by the lock data mode is suitable for being processed by the NGPON2 standard subsequently, and the rate of the NGPON2 data is 10G/s; the data processed by the lock clock mode can ensure the stability of a sampling clock, and is suitable for subsequent processing in the XGPON standard, and the speed of the XGPON data is 2.5G/s. Here, the uplink data is BCDR-processed into 4 groups of differential signal data of 16 pairs. Here, the 4 groups of 16 differential signal data are further subjected to differential-to-single-ended processing, the data are combined into 64-bit single-ended data, and clock recovery is performed according to the differential signal data, the recovered clock is used for internal use, and synchronization between the converted single-ended data and the clock is maintained.
Step 402: performing down-sampling processing on the single-ended data which is recovered by adopting the second mode and is subjected to differential to single-ended conversion, and converting the single-ended data into down-sampled single-ended data;
here, the single-ended data restored in the second mode and subjected to differential-to-single-ended processing is adapted to be processed in accordance with the XGPON standard; the XGPON uplink rate is 2.48832Gbps, and the bit width is 16 bits; because the single-ended data subjected to differential-to-single-ended processing is 64 bits, the 64-bit single-ended data needs to be subjected to down-sampling processing; in this manner, a down-sampled 16-bit single-ended number may be processed in accordance with the XGPON standard.
Step 403: processing the single-ended data and the single-ended data after down-sampling by adopting a first standard and a second standard respectively; after the delimiting is successful, descrambling and FEC decoding are carried out, and the processed GTC frame is sent;
specifically, processing the received single-ended data using a first standard includes: firstly, delimiting the single-ended data, if the delimiting is successful, sending first delimiting success information, descrambling and FEC decoding by adopting a first standard, and finally sending the processed GTC frame; the first standard is the NGPON2 standard;
processing the received down-sampled single-ended number using a second criterion, comprising: delimiting the single-ended data subjected to down-sampling, if delimiting is successful, sending second delimiting success information, descrambling and FEC decoding by adopting a second standard, and finally sending the processed GTC frame; the second standard is the XGPON standard.
The method for implementing the compatibility of the passive optical network further includes: sending successful delimitation information after delimitation is successful; determining ONU rate information corresponding to the ONU according to the delimiting success information; binding the ONU rate information corresponding to the ONU, the distributed ONU _ ID and the TCONT table together and sending the ONU to the ONU;
specifically, the first delimiting success information and the second delimiting success information correspond to successful delimiting by using a first standard and successful delimiting by using a second standard respectively, so that if the received first delimiting success information is the first delimiting success information, the ONU rate is indicated as the first standard; if the received information is the second delimiting success information, indicating that the ONU rate is the second standard; here the first standard is the NGPON2 standard and the second standard is the XGPON standard.
If two pieces of successful delimitation information are received simultaneously, one of the two pieces of successful delimitation information can be processed firstly according to a preset processing strategy, for example, the ONU with the processing strategy of NGPON2 standard speed can be set to be registered preferentially according to market promotion requirements, here, the ONU with the NGPON2 standard speed can be registered preferentially according to a common processing strategy, the ONU speed information can be distinguished by 1 and 0, the ONU speed information of the NGPON2 standard is represented by 1, and the ONU speed information of the XGPON standard is represented by 0.
The embodiment of the invention also discloses a passive optical network compatible O L T, the passive optical network compatible O L T comprises an optical module, a Gigabit passive optical network packaging mode (XGGUGEM, X Gigabit Upstream GPON EncapsulationnMode) deframing unit, a Dynamic Bandwidth Allocation (DBA, Dynamic Bandwidth Allocation (DBA) unit, a Gigabit passive optical network transmission convergence (XGGCTC, X Gigabit Upstream GTC) unit, a Gigabit Upstream Power level adjustment XGUP L M (XGOP L M, X Gigabit Upstream Pop L evolution), a Gigabit Upstream frame delimiter (UBIP, XGABistream T Interleaved), a Gigabit Upstream Dynamic broadband Report (XGDBR, XGABIBIT Upstream Bandwidth), a downlink data part, a passive optical network compatible device, a second Upstream sampling unit, a DR unit, a first Upstream sampling unit, a second Upstream sampling unit, a DR 14 unit, a second Upstream sampling unit, a DR 5913 unit,
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 recovered uplink data to the first SE L ECTIO unit 13 and the second SE L ECTIO unit 14, respectively;
specifically, when the ONU transmits upstream data to the O L T, the upstream data enters an optical module of the O L T in the form of an optical signal, the optical module converts the upstream data of the optical signal into upstream data of an electrical signal and transmits the upstream data to the first upstream BCDR unit 11 and the second upstream BCDR unit 12, the first upstream BCDR unit 11 and the second upstream BCDR unit 12 respectively adopt different working modes to complete recovery of the upstream data, here, the first upstream BCDR unit 11 can be used for processing data meeting NGPON2 standards, the NGPON2 is a signal with a 10G/s rate, the first upstream BCDR unit 11 needs to be configured in a lock data mode, the second upstream BCDR unit 12 can be used for processing data meeting XGPON standards, the XGPON upstream rate is 2.5G/s, since subsequent processing involves a down-sampling module, in order to ensure stability of a sampling clock, the second upstream BCDR unit 12 needs to be configured in a lock clock mode, here, the first upstream BCDR unit 11 and the second upstream BCDR unit 12 recover the ectpon data into a differential signal 16 for transmitting the ECTIO 13 and the second upstream bcse 3614.
The first SE L ECTIO unit 13 and the second SE L ECTIO unit 14 are configured to perform differential-to-single-ended conversion processing on the received recovered uplink data, and send the converted single-ended data to the first uplink path unit 16 and the down-sampling unit 15, respectively;
specifically, the first SE L ECTIO unit 13 and the second SE L ECTIO unit 14 perform differential-to-single-ended conversion on the received 4 groups of 16 differential signal data output by the first uplink BCDR unit 11 and the second uplink BCDR unit 12, synthesize the data into 64-bit single-ended data, send the 64-bit single-ended data to the first uplink channel unit 16 and the down-sampling unit 15, perform clock recovery according to the differential signal data, send the recovered clock to the inside for use, and keep the synchronization between the single-ended data and the clock.
The down-sampling unit 15 is configured to down-sample the received single-ended data sent by the second SE L ECTIO unit 14, and send the down-sampled single-ended data to the second uplink unit 17;
here, the down-sampling unit 15 down-samples the 64-bit single-ended data sent by the second SE L ECTIO unit 14, and down-samples the 64-bit single-ended data into a 16-bit single-ended number, so that the 16-bit single-ended number can be processed by the second up-path unit 17.
The first uplink path unit 16 is configured to process the received single-ended data sent by the first SE L ECTIO unit 13 by using a first standard, perform descrambling and FEC decoding processing after the delimiting is successful, and send a GTC frame that is processed;
specifically, the first uplink path unit 16 may be configured to process data of the NGPON2, where the uplink rate of the processed data is 9.95328Gbps, the data recovery clock is 155.52M, the bit width is 64 bits, and the data may be configured to process data of 10Gbit/s rate, which is also referred to as a 10G path;
the first uplink access unit 16 comprises an XGDU L IM unit, an XGDSC unit and an XGDU EC unit, wherein the XGDU L IM unit is used for delimiting the single-ended data by adopting a first standard, the XGDSC unit is used for descrambling the single-ended data by adopting the first standard, the XGDU FEC unit is used for FEC decoding the single-ended data by adopting the first standard, the data processing process of the first uplink access unit 16 comprises the steps of firstly delimiting the single-ended data sent by the first SE L ECTIO unit 13, if the delimitation is successful, sending first delimiting success information, descrambling and decoding, and finally sending the finished GTC frame, and the first standard is the NGPON2 standard.
The second uplink path unit 17 is configured to process the received single-ended data after down sampling by using a second standard, perform descrambling and FEC decoding after the delimiting is successful, and send a GTC frame after the descrambling and FEC decoding is completed;
specifically, the second uplink path unit 17 may be configured to process XGPON data, where the uplink rate of the processed data is 2.48832Gbps, the bit width is 16 bits, and the second uplink path unit may be configured to process 2.5Gbit/s data, which is also referred to as a 2.5G path, so that 64-bit single-ended data processed by the second SE L ECTIO unit 14 may be sent to the second uplink path unit 17 for processing only after being down-sampled by the down-sampling unit 15 to 16-bit single-ended data;
the second uplink access unit 17 comprises a UD L IM unit, a UDSC unit and a UFEC unit, wherein the UD L IM unit is used for delimiting the single-ended data after the down-sampling by adopting a second standard, the UDSC unit is used for descrambling the single-ended data after the down-sampling by adopting the second standard, the UFEC unit is used for FEC decoding the single-ended data after the down-sampling by adopting the second standard, the data processing process of the second uplink access unit 17 comprises the steps of firstly delimiting the single-ended data after the down-sampling, if the delimitation is successful, sending second delimiting success information, descrambling and FEC decoding, and finally sending the GTC frame after the processing, and the second standard is the XGPON standard.
The GTC frames sent by the first uplink path unit 16 and the second uplink path unit 17 are deframed by the subsequent GTC deframing unit, and send the deframed data to different processing units for processing.
The passive optical network compatible device provided by the embodiment of the invention further comprises: an uplink reception control unit 18;
the uplink receiving control unit 18 is configured to receive first delimiting success information and second delimiting success information sent by the first uplink access unit 16 and the second uplink access unit 17; determining the ONU rate information according to the first delimiting success information and the second delimiting success information; if the received first boundary success information is the first boundary success information, the first uplink access unit 16 processes data by adopting the first standard because the first boundary success information is sent by the first uplink access unit 16, and thus, the ONU rate is the first standard; if the received second delimiting success information is the second delimiting success information, the second upstream access unit 17 processes data by adopting the second standard because the second delimiting success information is sent by the second upstream access unit 17, thus indicating that 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, and 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.
In the ONU registration process, the uplink receiving control unit 18 binds the ONU rate information corresponding to the ONU, the ONU serial number NU _ ID uploaded by the ONU and the TCONT table together and sends the information to the ONU through the downlink unit of O L T to complete bidirectional authorization, if two pieces of successful delimitation information are received at the same time, one of the two pieces of successful delimitation information can be processed firstly according to a preset processing strategy, for example, the ONU with the processing strategy of the standard NGPON2 rate can be set for preferential registration according to market promotion requirements, and the ONU with the standard NGPON2 rate can be preferentially registered according to a common processing strategy.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (8)
1. A passive optical network compatible device is characterized by comprising a first uplink burst clock data recovery BCDR unit, a second uplink BCDR unit, a first differential-to-single-ended SE L ECTIO unit, a second SE L ECTIO unit, a down-sampling unit, a first uplink channel unit and a second uplink channel unit, wherein,
the first uplink BCDR unit and the second uplink BCDR unit are used for recovering uplink data of the optical network unit ONU by adopting a first mode and a second mode and respectively sending the recovered uplink data to a first SE L ECTIO unit and a second SE L ECTIO unit;
the first SE L ECTIO unit and the second SE L ECTIO unit are used for respectively carrying out differential-to-single-ended conversion on the received recovered uplink data and respectively sending the converted single-ended data to the first uplink channel unit and the down-sampling unit;
the down-sampling unit is configured to down-sample the received single-ended data sent by the second SE L ECTIO unit, and send the down-sampled single-ended data to the second uplink path unit;
the first uplink access unit is used for processing the received single-ended data sent by the first SE L ECTIO unit by adopting a first standard, performing descrambling and Forward Error Correction (FEC) decoding processing after the delimiting is successful, and sending the processed gigabit passive optical network transmission convergence (GTC) frame;
the second uplink access unit is configured to process the received single-ended data after down sampling by using a second standard, perform descrambling and FEC decoding after the delimiting is successful, and send a GTC frame after the descrambling and FEC decoding are completed;
the first standard is a gigabit passive optical network (NGPON) 2 standard;
the second standard is an asymmetric gigabit passive optical network XGPON standard;
the first uplink BCDR unit is specifically used for recovering uplink data of the ONU by adopting a data locking mode;
and the second uplink BCDR unit is specifically used for recovering uplink data of the ONU by adopting a lock clock mode.
2. The apparatus of claim 1,
the first SE L ECTIO cell and the second SE L ECTIO cell are specifically used for performing differential-to-single-ended conversion processing on received uplink data, recovering a clock according to the received uplink data, and keeping synchronization between the converted single-ended data and the clock.
3. The apparatus of claim 1,
the first uplink access unit comprises a trillion uplink delimitation XGDU L IM unit, a trillion uplink descrambling XGDSC unit and a trillion uplink forward error correction XGDEC unit;
the first uplink access unit is also used for sending first delimiting success information after delimiting succeeds;
the second uplink channel unit comprises an uplink delimitation UD L IM unit, an uplink descrambling UDSC unit and an uplink forward error correction UFEC unit;
and the second uplink access unit is also used for sending second delimitation success information after the delimitation is successful.
4. The apparatus of claim 3, further comprising: the uplink receiving control unit is used for acquiring the first delimiting success information and the second delimiting success information;
determining the ONU rate information according to the first delimiting success information and the second delimiting success information;
binding the ONU rate information corresponding to the ONU, the serial number ONU _ ID allocated to the ONU and a service container TCONT table together and sending the bound information to the ONU;
and if the uplink receiving control unit receives the first delimiting success information and the second delimiting success information at the same time, processing one of the information according to a preset processing strategy.
5. A method for implementing passive optical network compatibility is characterized in that the method comprises the following steps:
respectively adopting a first mode and a second mode to recover uplink data of the ONU, and respectively carrying out differential-to-single-ended conversion on the recovered uplink data to convert the recovered uplink data into single-ended data;
performing down-sampling processing on the single-ended data which is recovered by adopting the second mode and is subjected to differential to single-ended conversion, and converting the single-ended data into down-sampled single-ended data;
processing the single-ended data and the downsampled single-ended data respectively by adopting a first standard and a second standard, descrambling and FEC decoding after the delimiting is successful, and sending a processed GTC frame;
the first standard is a gigabit passive optical network (NGPON) standard;
the second standard is an asymmetric gigabit passive optical network XGPON standard;
the first mode is a lock data mode;
the second mode is a lock clock mode.
6. The method of claim 5, further comprising:
sending successful delimitation information after delimitation is successful;
determining ONU rate information corresponding to the ONU according to the delimiting success information;
and binding the ONU rate information corresponding to the ONU, the distributed ONU _ ID and the TCONT table together and sending the bound ONU rate information, the distributed ONU _ ID and the TCONT table to the ONU.
7. The method according to claim 5, wherein the down-sampling the single-ended data recovered in the second mode and converted from differential to single-ended to down-sampled single-ended data comprises:
and carrying out differential to single-ended conversion on the single-ended data which is recovered and converted by adopting the second mode, recovering a clock for internal use from the received uplink data, and keeping the synchronization of the converted single-ended data and the clock.
8. An optical line terminal O L T, wherein the O L T comprises the passive optical network compatible device as claimed in any one of claims 1 to 4.
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| CN201510919447.3A CN106878834B (en) | 2015-12-10 | 2015-12-10 | Passive optical network compatible device and implementation method thereof and optical line terminal |
| PCT/CN2016/100938 WO2017097020A1 (en) | 2015-12-10 | 2016-09-29 | Passive optical network compatible device and implementation method therefor, and optical line terminal |
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| CN117201970A (en) * | 2022-05-30 | 2023-12-08 | 中兴通讯股份有限公司 | Data transmission method, optical line terminal, optical network unit, and readable medium |
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