CN106878834B - Passive optical network compatible device and implementation method thereof and optical line terminal - Google Patents

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

A passive optical network compatible device and its realization method and optical line terminal

technical field

The present invention relates to a passive optical network (Passive Optical Network, PON) system transmission technology, and in particular to a passive optical network compatible device and an implementation method thereof, and an optical line terminal (Optical Line Terminal, OLT).

Background technique

In recent years, with the rapid development of the global access market and the rapid development of full-service operations, the existing PON technical standards have improved in terms of bandwidth requirements, service support capabilities, and performance improvement of access node equipment and supporting equipment. Facing new upgrade requirements. At present, 10 Gigabit Passive Optical Network (NGPON, N Gigabit-Capable Passive Optical Network) is already in the commercial stage, NGPON is divided into two standards: Passive Optical Network (XGPON, X Gigabit-Capable Passive Optical Network) and NGPON2; among them, XGPON Asymmetric mode (upstream 2.5Gbit/s, downstream 10Gbit/s), symmetrical mode (upstream 10Gbit/s, downstream 10Gbit/s) is called NGPON2; NGPON2 upstream rate is 10Gbit/s. Considering the coexistence of XGPON and NGPON2, NGPON2 needs to be compatible with the XGPON mode at the same time; at present, NGPON2 and XGPON in the PON system can use the same wavelength and realize coexistence through Time Division Multiple Access (TDMA, Time Division Multiple Access) technology.

However, when NGPON2 and XGPON two optical network unit (ONU, Optical Network Unit) devices coexist in the network, the existing OLT cannot be compatible with the upstream rates of NGPON2 and XGPON at the same time; how to adapt to these two ONU devices, compatible with NGPON2 and XGPON, Lower costs and smoother network evolution are the problems that operators and equipment manufacturers need to solve.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present invention expect to provide a passive optical network compatible device and an implementation method thereof, and an optical line terminal, which are compatible with both NGPON2 and XGPON passive optical networks, so that the passive optical network can evolve smoothly.

In order to achieve the above object, the technical scheme of the present invention is achieved in this way:

An embodiment of the present invention provides a passive optical network compatible device, the device includes: a first upstream burst clock data recovery (BCRD, BurstClock and Data Recovery) unit, a second upstream BCDR unit, a first differential to single-ended conversion (SELECTIO) unit, second SELECTIO unit, down-sampling unit, first upstream path unit, second upstream path unit; wherein,

The first upstream BCDR unit and the second upstream BCDR unit are used to restore the upstream data of the optical network unit ONU using the first mode and the second mode, and send the restored upstream data to the first SELECTIO unit and the second SELECTIO unit respectively unit;

The first SELECTIO unit and the second SELECTIO unit are used to perform differential-to-single-ended processing on the recovered uplink data received, respectively, and send the converted single-ended data to the first uplink channel unit and the downsampling unit respectively ;

The downsampling unit is used to downsample the received single-ended data sent by the second SELECTIO unit, and send the downsampled single-ended data to the second upstream path unit;

The first uplink path unit is used to process the received single-ended data sent by the first SELECTIO unit using the first standard; after the delimitation is successful, perform descrambling and Forward Error Correction (FEC, Forward Error Correction). ) decoding processing, and sending the processed Gigabit Passive Optical Network Transmission Convergence (GTC, GPON Transmission Convergence) frame;

The second uplink path unit is used to process the received single-ended data after the down-sampling by the second standard, and after the delimitation is successful, perform descrambling and FEC decoding processing, and send the processed GTC frame .

In the above scheme, the first upstream BCDR unit is specifically used to recover the upstream data of the ONU by adopting the lock data mode;

The second upstream BCDR unit is specifically used for recovering the upstream data of the ONU in a clock lock mode.

In the above scheme, the first SELECTIO unit and the second SELECTIO unit are specifically used to perform differential-to-single-ended processing on the received uplink data, and restore the clock according to the received uplink data, keeping the synchronization of the converted single-ended data and the clock. .

In the above scheme, the first uplink path unit includes: a 10 Gigabit uplink delimiter (XGUDLIM, X Gigabit Upsteam Delimiter) unit, a 10 Gigabit uplink descrambling (XGUDSC, X Gigabit Upsteam Descramble) unit, and a 10 Gigabit uplink forward correction. Error (XGUFEC, X Gigabit Upsteam Forward Error Correction) unit;

The first uplink path unit is further configured to send the first delimitation success information after the delimitation is successful;

The second upstream path unit includes: an upstream delimiter (UDLIM, Upstream Delimiter) unit, an upstream descrambling (UDSC, Upstream Descramble) unit, and an upstream forward error correction (UFEC, Upsteam ForwardError Correction) unit;

The second uplink path unit is further configured to send second delimitation success information after the delimitation is successful;

The first standard is the 10 Gigabit Passive Optical Network NGPON2 standard;

The second standard is an asymmetric 10 Gigabit passive optical network XGPON standard.

In the above solution, the device further includes: an uplink receiving control unit, configured to acquire the first delimitation success information and the second delimitation success information;

Determine the ONU rate information according to the first delimitation success information and the second delimitation success information;

According to the ONU rate information corresponding to the ONU, the sequence number (ONU_ID, ONU_Identity) assigned to the ONU, the service container (TCONT, Transmission Containers) table is bound together and issued to the ONU;

If the uplink receiving control unit receives the first delimitation success information and the second delimitation success information at the same time, it processes one of them first according to a preset processing strategy.

The embodiment of the present invention also provides a passive optical network compatible implementation method, the method includes:

Adopt the first mode and the second mode to restore the upstream data of the ONU respectively, and perform differential-to-single-ended processing on the recovered upstream data respectively, and convert it into single-ended data;

Perform down-sampling processing on the single-ended data recovered by the second mode and converted into single-ended data through differential to single-ended conversion, and converted into down-sampled single-ended data;

The single-ended data and the down-sampled single-ended data are processed using the first standard and the second standard, respectively, and after successful delimitation, descrambling and FEC decoding are performed, and the processed GTC frame is sent.

In the above scheme, the method further includes: after the delimitation is successful, the delimitation success information is sent;

According to the delimiting success information, determine the ONU rate information corresponding to the ONU;

According to the ONU rate information corresponding to the ONU, the allocated ONU_ID, and the TCONT table are bound together and delivered to the ONU.

In the above scheme, the single-ended data recovered by the second mode and converted into single-ended data after differential to single-ended conversion is subjected to down-sampling processing, and converted into down-sampled single-ended data, including:

Differential-to-single-ended processing is performed on the single-ended data recovered and converted using the second mode, and the received uplink data is recovered as a clock for internal use to maintain the synchronization of the converted single-ended data and the clock.

In the above scheme, the first standard is the 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 clock lock mode.

An embodiment of the present invention further provides an OLT, characterized in that, the OLT includes: the passive optical network compatible device according to any one of the above solutions.

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 restore the upstream data of the ONU, and perform differential-to-single-end processing on the restored upstream data respectively, Convert the single-ended data into single-ended data; perform down-sampling processing on the single-ended data recovered and converted using the second mode, and convert it into single-ended data after down-sampling; the first uplink path and the second uplink path respectively use different standards for the single-ended data. The terminal data and the single-ended data after the downsampling are processed, and after the delimitation is successful, descrambling and FEC decoding processing are performed, and the processed GTC frame is sent; it can be seen that, due to the use of two uplink BCRD units respectively Two modes are used to restore the upstream data of the ONU, and different standards are used in the two paths to process different single-ended data respectively; in this way, the embodiment of the present invention can enable one device to meet the transmission requirements of NGPON2 and XGPON data at two rates at the same time. Achieve the purpose of being compatible with NGPON2 and XGPON passive optical networks, so that the evolution of passive optical networks is smoother and the cost is lower.

Description of drawings

1 is a schematic diagram of a composition structure of a passive optical network compatible device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the implementation principle of an example dual-rate data processing of the present invention;

FIG. 3 is a schematic diagram of an example dual-rate processing bidirectional authorization flow diagram of the present invention;

FIG. 4 is a schematic flowchart of a method for implementing passive optical network compatibility according to an embodiment of the present invention.

Detailed ways

In the embodiment of the present invention, the first mode and the second mode are respectively used to restore the upstream data of the ONU, and the restored upstream data is processed by differential to single-ended respectively, and converted into single-ended data; The single-ended data is down-sampled and converted into down-sampled single-ended data; the first upstream path and the second upstream path use different standards to process the single-ended data and the down-sampled single-ended data respectively, And after the delimitation is successful, descrambling and FEC decoding are performed, and the processed GTC frame is sent.

The present invention will be described in further detail below in conjunction with the embodiments.

The passive optical network compatible device provided by the embodiment of the present invention, as shown in FIG. 1 , includes:

The first upstream BCDR unit 11, the second upstream BCDR unit 12, the first differential to single-ended (SELECTIO) unit 13, the second SELECTIO unit 14, the downsampling unit 15, the first upstream channel unit 16, the second upstream channel unit 17 ;in,

The first upstream BCDR unit 11 and the second upstream BCDR unit 12 are used to restore the upstream data of the optical network unit ONU using different operating modes, and send the restored upstream data to the first SELECTIO unit 13 and the second SELECTIO unit respectively 14;

Specifically, when the ONU sends uplink data to the OLT, 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 it to the first uplink BCDR unit 11 and The second upstream BCDR unit 12; the first upstream BCDR unit 11 and the second upstream BCDR unit 12 respectively use different working modes to complete the recovery of the upstream data. Here, the first upstream BCDR unit 11 can be used to process data that meets the NGPON2 standard. NGPON2 is a signal with a rate of 10G/s. The first upstream BCDR unit 11 needs to be configured to lock data mode; the second upstream BCDR unit 12 can be used to process For data that meets the XGPON standard, the XGPON uplink rate is 2.5G/s; because the subsequent processing involves a downsampling module, in order to ensure the stability of the sampling clock, the second uplink BCDR unit 12 needs to be configured in a clock lock mode. Here, the first upstream BCDR unit 11 and the second upstream BCDR unit 12 restore the upstream data into 4 groups of 16 pairs of differential signal data and send them to the first SELECTIO unit 13 and the second SELECTIO unit 14 .

The first SELECTIO unit 13 and the second SELECTIO unit 14 are used to perform differential-to-single-ended processing on the recovered uplink data received, and send the converted single-ended data to the first uplink channel unit 16 and downsampling unit 15;

Specifically, the first SELECTIO unit 13 and the second SELECTIO unit 14 respectively perform differential-to-single-ended processing on the received four groups of 16 pairs of differential signal data output by the first upstream BCDR unit 11 and the second upstream BCDR unit 12; The data is synthesized into 64-bit single-ended data and sent to the first upstream channel unit 16 and the down-sampling unit 15 respectively, and clock recovery is performed according to the differential signal data to keep the 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 SELECTIO unit 14, and send the down-sampled single-ended data to the second upstream path unit 17;

Here, the downsampling unit 15 performs downsampling processing on the 64-bit single-ended data sent by the second SELECTIO unit 14, and downsamples the 64-bit single-ended data to a 16-bit single-ended number; thus, 16 The single-ended number of bits can be handled by the second upstream path unit 17 .

The first uplink path unit 16 is used to process the received single-ended data sent by the first SELECTIO unit 13 using the first standard, and after the delimitation is successful, perform descrambling and FEC decoding processing, and send processing finished GTC frame;

Specifically, the first upstream channel unit 16 can be used to process the data of NGPON2, the upstream rate of the processed data is 9.95328Gbps, the data recovery clock is 155.52M, and the bit width is 64 bits, and can be used to process the data at a rate of 10Gbit/s, Also called 10G path; so the 64-bit single-ended data processed by the first SELECTIO unit 13 can be directly sent to the first upstream path unit 16 for processing;

The first uplink channel unit 16 includes: an XGUDLIM unit, an XGUDSC unit, and an XGUFEC unit; the XGUDLIM unit is used to delimit the single-ended data by using the first standard; the XGUDSC unit is used to use the first standard. A standard descrambles the single-ended data; the XGUFEC unit is configured to perform FEC decoding on the single-ended data using the first standard. The data processing process of the first uplink path unit 16 is as follows: first, delimit the single-ended data sent by the first SELECTIO unit 13, and if the delimitation succeeds, send the first delimitation success information and perform descrambling. and FEC decoding processing, and finally send the processed GTC frame; the first standard is the NGPON2 standard.

The second uplink path unit 17 is used to process the received single-ended data after the down-sampling by the second standard, and after the delimitation is successful, perform descrambling and FEC decoding processing, and send the processed GTC frame;

Specifically, the second upstream channel unit 17 can be used to process XGPON data, the upstream rate of the processed data is 2.48832Gbps, the bit width is 16 bits, and it can be used to process data at a rate of 2.5Gbit/s, also called a 2.5G channel ; So the single-ended data of 64 bits processed by the second SELECTIO unit 14 needs to be down-sampled into the single-ended data of 16 bits through the down-sampling unit 15, just can be 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 used to delimit the down-sampled single-ended data by using a second standard; the UDSC unit, The UFEC unit is configured to use the second standard to descramble the down-sampled single-ended data; the UFEC unit is configured to perform FEC decoding on the down-sampled single-ended data using the second standard. The data processing process of the second uplink path unit 17 is as follows: first, delimit the single-ended data after the down-sampling, and if the delimitation is successful, send the second delimitation success information, and perform descrambling and FEC translation. code processing, and finally send the processed GTC frame; the second standard is the XGPON standard.

The GTC frames sent by the first uplink channel unit 16 and the second uplink channel unit 17 are deframed by subsequent GTC deframe units, and the deframed data are sent to different processing units for processing.

The passive optical network compatible device provided by the embodiment of the present invention further includes: an uplink receiving control unit 18;

The upstream receiving control unit 18 is configured to receive the first delimitation success information and the second delimitation success information sent by the first upstream path unit 16 and the second upstream path unit 17; according to the first delimitation success information Determine the ONU rate information with the second demarcation success information; if what is received is the first demarcation success information, because the first demarcation success information is sent by the first upstream path unit 16, the first upstream path unit 16 adopts The first standard processes data, so that the ONU rate is the first standard; if what is received is the second delimitation success information, since the second delimitation success information is sent by the second upstream path unit 17, the second upstream path unit 17 Use the second standard to process data, so 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 can 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.

In the ONU registration process, the upstream receiving control unit 18 binds the ONU rate information corresponding to the ONU, the sequence number ONU_ID assigned to the ONU, and the TCONT table, and sends it to the ONU through the downstream unit of the OLT to complete the two-way authorized. If two delimitation success messages are received at the same time, one of them can be processed first according to the preset processing strategy; for example, the processing strategy can be set as the ONU with the NGPON2 standard rate according to the market promotion needs to register first; The processing strategy is to preferentially register ONUs with NGPON2 standard rate.

The positive effects of the present invention will be described in further detail below with reference to specific examples.

The implementation principle of double-rate data processing is shown in Figure 2, including: after the upstream data of the ONU is sent to the 2.5G and 10G channels, it is delimited first, according to the upstream data and the delimiter of the 10G delimiter module and the delimiter module. Perform cross-correlation operation. When the obtained cross-correlation operation value is within the configured threshold range, it is considered that the delimiter header is found, so as to align the input data according to the drift value and send it to the following modules for descrambling, FEC, and GTC solutions. The frame is sent to the traffic management (TM, TrafficManagement) module for processing.

The schematic diagram of the two-way authorization process of double-rate processing is shown in Figure 3. First, the OLT sends three upstream overhead physical layer operation management and maintenance (Upstream_Overhead PLOAM, Upstream_Overhead Physical Layer Operations And Maintenance) messages to all the ONUs under the OLT PON port; the ONU receives the After entering the serial number (SN, Serial Number) state, the OLT opens a silent window after the waiting time T1, and sends the SN request and a half-empty frame through the bandwidth map (BWMAP, BandWidth Map); after the ONU receives the SN request, Send its own SN message; since there are two rates of data in the uplink, as shown in step 301: the uplink receiving control unit (URC, UpstreamReceive Control) according to the ITU-T G.989.3 protocol, when the ALLOC_ID is 3FD, Open the window for both delimiter modules, and the two channels of data will enter the 2.5G and 10G channels at the same time; assuming that the SN message of the 10G ONU is coming up at this time, the data enters the 10G delimiter module, and then enters 2.5G after downsampling. For the delimiter module, the delimiter can only be found in the 10G delimiter module. Similarly, 2.5G data can only be found in the 2.5G delimiter module; URC receives the delimiter given by the delimiter module. After the delimitation success flag (SYNC) signal, a rate flag bit (RATEMODE) will be given to the Upstream Physical Layer Operations And Maintenance (UPLOAM) message module. If the SYNC signal comes from the 10G delimiter module, Then the flag bit RATEMODE is 1, otherwise it is 0; when the software extracts the SN PLOAM message, it extracts the rate flag bit together, and then assigns the corresponding ONU_ID to the ONU at this time, and this ONU enters the ranging state; the software is assigning The operation of ONU_ID is serial, so there will be no second ONU in the ranging state at this time; after receiving the ranging request from the OLT, the ONU sends a register (RG, Register) PLOAM message, which contains ONU_ID, at this time URC binds RATEMODE, ONU_ID and TCONT table together and sends it to ONU, thus completing two-way authorization, ONU completes activation and starts to enter various business communications, and starts to register ONU of another rate; When processing, the ONU with the corresponding rate is registered first, and the ONU with the corresponding rate is registered first.

Based on the above-mentioned 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 , the method includes the following steps:

Step 401: respectively adopt the first mode and the second mode to restore the upstream data of the ONU, and perform differential-to-single-ended processing respectively, and convert them into single-ended data;

Here, when the ONU sends uplink 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 NGPON2 and XGPON, the first mode and the third mode are respectively adopted. Two modes perform BCDR on the uplink data; the first mode is a data lock mode, and the second mode is a clock lock mode. The data processed in the lock data mode is suitable for subsequent processing in the NGPON2 standard, and the rate of the NGPON2 data is 10G/s; the data processed in the clock lock mode can ensure the stability of the sampling clock, and is suitable for subsequent processing in the XGPON standard. , the XGPON data rate is 2.5G/s. Here, the uplink data is processed by BCDR into four groups of 16 pairs of differential signal data. Here, the four groups of 16 pairs of differential signal data are then subjected to differential-to-single-ended processing, and the data is synthesized 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 kept Synchronization of the converted single-ended data to the clock.

Step 402: Perform down-sampling processing on the single-ended data recovered by the second mode and converted into single-ended data by differential conversion, and converted into down-sampled single-ended data;

Here, the single-ended data recovered using the second mode and subjected to differential-to-single-ended processing is suitable for processing in accordance with the XGPON standard; the XGPON uplink rate is 2.48832 Gbps, and the bit width is 16 bits; The data is 64 bits, so it is necessary to down-sample the 64-bit single-ended data; in this way, the down-sampled 16-bit single-ended data can be processed according to the XGPON standard.

Step 403: use the first standard and the second standard to process the single-ended data and the down-sampled single-ended data respectively; after the delimitation is successful, perform descrambling and FEC decoding, and send the processed GTC frame;

Specifically, using the first standard to process the received single-ended data includes: firstly delimiting the single-ended data, and if the delimitation succeeds, sending first demarcation success information, and using the first standard to delimit the single-ended data. descrambling and FEC decoding processing, and finally sending the processed GTC frame; the first standard is the NGPON2 standard;

Using the second standard to process the received down-sampled single-ended data includes: firstly delimiting the down-sampled single-ended data, and if the delimitation succeeds, sending second delimitation success information, and using The second standard performs descrambling and FEC decoding processing, and finally sends the processed GTC frame; the second standard is the XGPON standard.

The implementation method of passive optical network compatibility in this embodiment further includes: sending delimitation success information after delimitation is successful; determining ONU rate information corresponding to the ONU according to the delimitation success information; The rate information, the assigned ONU_ID, and the TCONT table are bound together and issued to the ONU;

Specifically, the first delimitation success information and the second delimitation success information respectively correspond to the success of delimitation using the first standard and the success of demarcation using the second standard. Therefore, if the received information is the first delimitation success information , it indicates that the ONU rate is the first standard; if the second delimitation success information is received, it indicates that the ONU rate is the second standard; here the first standard is the NGPON2 standard, and the second standard is the XGPON standard.

In the ONU registration process, the ONU rate information corresponding to the ONU and the allocated ONU_ID are bound together with the TCONT table and sent to the ONU through the downlink unit of the OLT to complete the bidirectional authorization. If two delimitation success messages are received at the same time, one of them can be processed first according to the preset processing strategy; for example, the processing strategy can be set as the ONU with the NGPON2 standard rate according to the market promotion needs to register first; The processing strategy is to preferentially register ONUs with NGPON2 standard rate. The ONU rate information can 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 present invention also provides an OLT compatible with a passive optical network. The OLT compatible with the passive optical network not only includes: optical modules, 10 Gigabit passive optical network encapsulation mode (XGUGEM, X Gigabit Upstream GPON Encapsulation Mode) deframe Unit, Dynamic Bandwidth Allocation (DBA, DBA) unit, 10 Gigabit Passive Optical Network Transmission Convergence (XGUGTC, X Gigabit Upstream GTC) unit, 10 Gigabit Upstream Power Level Adjustment XGUPLM (XGUPLM, X Gigabit Upstream Power Level) Management), 10 Gigabit Upstream Frame Delimiter (XGUBIP, XGigabit Upstream Bit Interleaved Parity), 10 Gigabit Upstream Dynamic Broadband Report (XGUDBR, XGigabit Upstream Dynamic Bandwidth Report), downstream data part; also includes passive optical network compatible devices, such as As shown in FIG. 1, the apparatus includes: a first upstream BCDR unit 11, a second upstream BCDR unit 12, a first SELECTIO unit 13, a second SELECTIO unit 14, a downsampling unit 15, a first upstream channel unit 16, a second Uplink unit 17; wherein,

The first upstream BCDR unit 11 and the second upstream BCDR unit 12 are used to restore the upstream data of the optical network unit ONU using different working modes, and send the restored upstream data to the first SELECTIO unit 13 and the second SELECTIO unit respectively 14;

Specifically, when the ONU sends uplink data to the OLT, 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 it to the first uplink BCDR unit 11 and The second upstream BCDR unit 12; the first upstream BCDR unit 11 and the second upstream BCDR unit 12 respectively use different working modes to complete the recovery of the upstream data. Here, the first upstream BCDR unit 11 can be used to process data that meets the NGPON2 standard. NGPON2 is a signal with a rate of 10G/s. The first upstream BCDR unit 11 needs to be configured to lock data mode; the second upstream BCDR unit 12 can be used to process For data that meets the XGPON standard, the XGPON uplink rate is 2.5G/s; because the subsequent processing involves a downsampling module, in order to ensure the stability of the sampling clock, the second uplink BCDR unit 12 needs to be configured in a clock lock mode. Here, the first upstream BCDR unit 11 and the second upstream BCDR unit 12 restore the upstream data into 4 groups of 16 pairs of differential signal data and send them to the first SELECTIO unit 13 and the second SELECTIO unit 14 .

The first SELECTIO unit 13 and the second SELECTIO unit 14 are used to perform differential-to-single-ended processing on the recovered uplink data received, and send the converted single-ended data to the first uplink channel unit 16 and downsampling unit 15;

Specifically, the first SELECTIO unit 13 and the second SELECTIO unit 14 respectively perform differential-to-single-ended processing on the received four groups of 16 pairs of differential signal data output by the first upstream BCDR unit 11 and the second upstream BCDR unit 12; The data is synthesized into 64-bit single-ended data, which are respectively sent to the first upstream channel unit 16 and the down-sampling unit 15, and clock recovery is performed according to the differential signal data, the recovered clock is used internally, and the single-ended data is kept Synchronization with the clock.

The down-sampling unit 15 is configured to down-sample the received single-ended data sent by the second SELECTIO unit 14, and send the down-sampled single-ended data to the second upstream path unit 17;

Here, the downsampling unit 15 performs downsampling processing on the 64-bit single-ended data sent by the second SELECTIO unit 14, and downsamples the 64-bit single-ended data to a 16-bit single-ended number; thus, 16 The single-ended number of bits can be handled by the second upstream path unit 17 .

The first uplink path unit 16 is used to process the received single-ended data sent by the first SELECTIO unit 13 using the first standard, and after the delimitation is successful, perform descrambling and FEC decoding processing, and send processing finished GTC frame;

Specifically, the first upstream channel unit 16 can be used to process the data of NGPON2, the upstream rate of the processed data is 9.95328Gbps, the data recovery clock is 155.52M, and the bit width is 64 bits, and can be used to process the data at a rate of 10Gbit/s, Also called 10G path; so the 64-bit single-ended data processed by the first SELECTIO unit 13 can be directly sent to the first upstream path unit 16 for processing;

The first uplink channel unit 16 includes: an XGUDLIM unit, an XGUDSC unit, and an XGUFEC unit; the XGUDLIM unit is used to delimit the single-ended data by using the first standard; the XGUDSC unit is used to use the first standard. A standard descrambles the single-ended data; the XGUFEC unit is configured to perform FEC decoding on the single-ended data using the first standard. The data processing process of the first uplink path unit 16 is as follows: first, delimit the single-ended data sent by the first SELECTIO unit 13, and if the delimitation succeeds, send the first delimitation success information and perform descrambling. and FEC decoding processing, and finally send the processed GTC frame; the first standard is the NGPON2 standard.

The second uplink path unit 17 is used to process the received single-ended data after the down-sampling by the second standard, and after the delimitation is successful, perform descrambling and FEC decoding processing, and send the processed GTC frame;

Specifically, the second upstream channel unit 17 can be used to process XGPON data, the upstream rate of the processed data is 2.48832Gbps, the bit width is 16 bits, and it can be used to process data at a rate of 2.5Gbit/s, also called a 2.5G channel So the 64-bit single-ended data processed by the second SELECTIO unit 14 needs to be down-sampled into 16-bit single-ended data through the down-sampling unit 15 and can be 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 used to delimit the down-sampled single-ended data by using a second standard; the UDSC unit, The UFEC unit is configured to use the second standard to descramble the down-sampled single-ended data; the UFEC unit is configured to perform FEC decoding on the down-sampled single-ended data using the second standard. The data processing process of the second uplink path unit 17 is as follows: first, delimit the single-ended data after the down-sampling, and if the delimitation is successful, send the second delimitation success information, and perform descrambling and FEC translation. code processing, and finally send the processed GTC frame; the second standard is the XGPON standard.

The GTC frames sent by the first uplink channel unit 16 and the second uplink channel unit 17 are deframed by subsequent GTC deframe units, and the deframed data are sent to different processing units for processing.

The passive optical network compatible device provided by the embodiment of the present invention further includes: an uplink receiving control unit 18;

The upstream receiving control unit 18 is configured to receive the first delimitation success information and the second delimitation success information sent by the first upstream path unit 16 and the second upstream path unit 17; according to the first delimitation success information Determine the ONU rate information with the second demarcation success information; if what is received is the first demarcation success information, because the first demarcation success information is sent by the first upstream path unit 16, the first upstream path unit 16 adopts The first standard processes data, so that the ONU rate is the first standard; if what is received is the second delimitation success information, since the second delimitation success information is sent by the second upstream path unit 17, the second upstream path unit 17 Use the second standard to process data, so 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 can 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.

In the ONU registration process, the upstream 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, and sends it to the ONU through the downstream unit of the OLT to Complete two-way authorization. If two delimitation success messages are received at the same time, one of them can be processed first according to the preset processing strategy; for example, the processing strategy can be set as the ONU with the NGPON2 standard rate according to the market promotion needs to register first; The processing strategy is to preferentially register ONUs with NGPON2 standard rate.

The above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (8)

1. a passive optical network compatible device, is characterized in that, described device comprises: the first upstream burst clock data recovery BCDR unit, the second upstream BCDR unit, the first differential to single-ended SELECTIO unit, the second SELECTIO unit , a downsampling unit, a first upstream path unit, and a second upstream path unit; wherein, The first upstream BCDR unit and the second upstream BCDR unit are used to restore the upstream data of the optical network unit ONU using the first mode and the second mode, and send the restored upstream data to the first SELECTIO unit and the second SELECTIO unit respectively unit; The first SELECTIO unit and the second SELECTIO unit are used to perform differential-to-single-ended processing on the recovered uplink data received, respectively, and send the converted single-ended data to the first uplink channel unit and the downsampling unit respectively ; The downsampling unit is used to downsample the received single-ended data sent by the second SELECTIO unit, and send the downsampled single-ended data to the second upstream path unit; The first uplink path unit is used to process the received single-ended data sent by the first SELECTIO unit using the first standard; after the delimitation is successful, perform descrambling and forward error correction (FEC) decoding processing, and Send the processed gigabit passive optical network transmission and aggregate GTC frames; The second uplink path unit is used to process the received single-ended data after the down-sampling by the second standard, and after the delimitation is successful, perform descrambling and FEC decoding processing, and send the processed GTC frame ; The first standard is the 10 Gigabit Passive Optical Network NGPON2 standard; The second standard is an asymmetric 10 Gigabit passive optical network XGPON standard; The first upstream BCDR unit is specifically used to recover the upstream data of the ONU by adopting the lock data mode; The second upstream BCDR unit is specifically used for recovering the upstream data of the ONU in a clock lock mode. 2. The device according to claim 1, characterized in that, The first SELECTIO unit and the second SELECTIO unit are specifically used to perform differential-to-single-ended processing on the received uplink data, recover the clock according to the received uplink data, and maintain the synchronization of the converted single-ended data and the clock. 3. The device according to claim 1, characterized in that, The first uplink path unit includes: a 10G uplink delimitation XGUDLIM unit, a 10G uplink descrambling XGUDSC unit, and a 10G uplink forward error correction XGUFEC unit; The first uplink path unit is further configured to send the first delimitation success information after the delimitation is successful; The second uplink path unit includes: an uplink delimitation UDLIM unit, an uplink descrambling UDSC unit, and an uplink forward error correction UFEC unit; The second uplink path unit is further configured to send second delimitation success information after delimitation is successful. 4. The apparatus according to claim 3, wherein the apparatus further comprises: an uplink receiving control unit, configured to acquire the first delimitation success information and the second delimitation success information; Determine the ONU rate information according to the first delimitation success information and the second delimitation success information; According to the ONU rate information corresponding to the ONU, the sequence number ONU_ID assigned to the ONU, the service container TCONT table are bound together and issued to the ONU; If the uplink receiving control unit receives the first delimitation success information and the second delimitation success information at the same time, it processes one of them first according to a preset processing strategy. 5. A passive optical network compatible implementation method, wherein the method comprises: Adopt the first mode and the second mode to restore the upstream data of the ONU respectively, and perform differential-to-single-ended processing on the recovered upstream data respectively, and convert it into single-ended data; Perform down-sampling processing on the single-ended data recovered by the second mode and converted into single-ended data through differential to single-ended conversion, and converted into down-sampled single-ended data; The first standard and the second standard are used to process the single-ended data and the down-sampled single-ended data respectively, and after the delimitation is successful, perform descrambling and FEC decoding processing, and send the processed GTC frame; The first standard is the 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 clock lock mode. 6. The method according to claim 5, wherein the method further comprises: After the delimitation is successful, the delimitation success message is sent; According to the delimiting success information, determine the ONU rate information corresponding to the ONU; According to the ONU rate information corresponding to the ONU, the allocated ONU_ID, and the TCONT table are bound together and delivered to the ONU. 7. The method according to claim 5, wherein the single-ended data restored by the second mode and converted into single-ended data through differential-to-single-ended conversion is subjected to down-sampling processing, and converted into down-sampled single-ended data ,include: Differential-to-single-ended processing is performed on the single-ended data recovered and converted using the second mode, and the received uplink data is recovered from the clock for internal use to maintain the synchronization of the converted single-ended data and the clock. 8. An optical line terminal OLT, wherein the OLT comprises: the passive optical network compatible device according to any one of claims 1 to 4.

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