WO2011006403A1 - Method and system for data transmission and provider edge node - Google Patents

Abstract

The embodiments of the present invention disclose a method and system for data transmission and a Provider Edge Node (PE-Node). Said method includes: processing Passive Optical Network (PON) physical layer signals to obtain PON Media Access Control (MAC) frames; processing said PON MAC frames to obtain the next generation Passive Optical Network (xPON) Media Access Control (MAC) frames, wherein said PON MAC frames are located in the payload of said xPON MAC frames; performing xPON physical layer processing on said xPON MAC frames to obtain xPON physical layer signals and transmitting said xPON physical layer signals. The embodiments of the present invention also provide a data transmission system and related devices. The embodiments of the present invention can effectively reduce the costs of data transmission, increase optical transmission distance and reduce implementation complexity.

Description

 A data transmission method, system and operator edge node The application is submitted to the Chinese Patent Office on July 15, 2009, and the application number is 200910152000. 2. The invention name is "a data transmission method, system and related equipment", And, on August 14, 2009, the Chinese Patent Office, the application number is 200910167099.3, the priority of the invention is "a data transmission method, system and operator edge node", the entire contents of which are incorporated by reference. In this application. The present invention relates to the field of communications, and in particular, to a data transmission method and system, and an operator edge node. The Passive Optical Network (P0N) technology is a point-to-multipoint optical access technology, which consists of an Optical Network Unit (ONU), an optical splitter, and an optical path termination point (0LT). , Optical Line Termination) and the fiber optic connection to this device. 0LT is used as the central office equipment. It is connected to the optical splitter through a trunk fiber. The optical splitter is connected to each ONU through a separate branch fiber. In the downstream direction, the optical splitter realizes the splitting function. The downlink optical signal of the 0LT is sent to all the ONUs. In the uplink direction, the optical splitter implements the optical signal convergence function, and all the optical signals transmitted by the ONU are aggregated and sent to the 0LT through the trunk optical fiber.

 As the broadband service grows, Passive Optical Network (P0N) technology is also evolving, from Asynchronous Transfer Mode (AP0N), Broadband Passive Optical Network (BP0N, Broadband). P0N) To Ethernet Passive Optical Network (EP0N, Ethernet PON), Gigabit Passive Optical Network (GP0N, Gigabit PON), 10G EP0N and 10G GP0N, the transmission bandwidth is increasing.

 The transmission distance of the PON is usually less than 20 kilometers. In order to effectively increase the transmission distance of the P0N, a data transmission method in the prior art is:

 The P0N is carried on a Wavelength Division Multiplexing (WDM) network by means of placing the P0N in an optical transport network (0TN, Optical Transport Network), that is, a PON over 0TN, and extending the optical network unit (ONU, Transmission distance between the Optical Network Unit and the Optical Line Termination (OLT).

However, WDM uses the P2P (Point to Point) technology of color light, that is, whether the WDM device close to the ONU or the WDM device close to the 0LT is colored, it needs to be provided for each wavelength on the WDM device. An optical transceiver, and P2P fiber cannot be shared, so the cost of such a data transmission process is relatively high. Secondly, since P0N (for example, GP0N/EP0N) is usually optically transmitted by time division multiplexing, that is, P0N usually adopts burst mode. Optical transmission is performed, and the existing 0TN uses WDM equipment for continuous mode optical transmission. Therefore, the data transmission mode of PON over 0TN needs to support burst mode to continuous mode conversion, which is complicated to implement. SUMMARY OF THE INVENTION Embodiments of the present invention provide a data transmission method and system, and an operator edge node, which can effectively reduce data transmission cost, extend optical transmission distance, and reduce implementation complexity.

 A data transmission method provided by the embodiment of the present invention includes: processing a physical layer signal of a passive optical network P0N to obtain a P0N medium access control MAC frame; processing the PON MAC frame to obtain a next generation passive optical network xPON medium Accessing a control MAC frame, the PON MAC frame is located in a load of the xPON MAC frame; performing xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and transmitting the xPON physical layer signal.

 Another data transmission method provided by the embodiment of the present invention includes: processing an xPON physical layer signal to obtain an xPON MAC frame; reading data in a load of the xPON MAC frame; according to a frame header of the xPON MAC frame The data in the load of the xPON MAC frame is processed to obtain a PON MAC frame; the P0N physical layer processing is performed on the PON MAC frame to obtain a P0N physical layer signal, and the P0N physical layer signal is sent.

 A data transmission system provided by the embodiment of the present invention includes: a user edge node, configured to receive data sent by a user terminal side, and send the data to an operator edge node; the operator edge node is used to The P0N physical layer signal in the data is processed to obtain a PON MAC frame, and the PON MAC frame is processed to obtain an xPON MAC frame, where the PON MAC frame is located in a load of the xPON MAC frame, and the xPON MAC frame is performed. The xPON physical layer processes the xPON physical layer signal and transmits the xPON physical layer signal.

 Another data transmission system provided by the embodiment of the present invention includes: an operator edge node, configured to process an xPON physical layer signal in the received data to obtain an xPON MAC frame, and read a load of the xPON MAC frame. Data, processing data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain a P0N MAC frame, performing P0N physical layer processing on the PON MAC frame to obtain a P0N physical layer signal, and transmitting the a P0N physical layer signal; a user edge node, configured to receive a P0N physical layer signal sent by the operator edge node.

An operator edge node provided by the embodiment of the present invention includes: a P0N physical layer processing unit, configured to process a P0N physical layer signal to obtain a PON MAC frame; and a framing processing unit, configured to process the PON MAC frame Obtaining an xPON MAC frame, where the PON MAC frame is located in a load of the xPON MAC frame, and an xPON physical layer processing unit, configured to perform xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and concurrently Sending the xPON physical layer signal.

 Another carrier edge node provided by the embodiment of the present invention includes: an xPON physical layer processing unit, configured to process an xPON physical layer signal to obtain an xPON MAC frame; and a framing processing unit, configured to read the xPON MAC frame Data in the load, processing data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain a PON MAC frame; a P0N physical layer processing unit, configured to perform P0N physical on the PON MAC frame The layer processing obtains the P0N physical layer signal and transmits the P0N physical layer signal.

 Another data transmission method provided by the embodiment of the present invention includes: processing service layer data to obtain a passive optical network P0N media access control MAC frame; processing the PON MAC frame to obtain a next generation passive optical network xPON medium Accessing a control MAC frame, the PON MAC frame is located in a load of the xPON MAC frame; performing xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and transmitting the xPON physical layer signal.

 Another data transmission method provided by the embodiment of the present invention includes: processing a received xPON physical layer signal to obtain an xPON MAC frame; reading data in a load of the xPON MAC frame; according to the frame of the xPON MAC frame The header processes the data in the payload of the xPON MAC frame to obtain a PON MAC frame; processing the PON MAC frame to obtain service layer data and transmitting the service layer data.

 Another carrier edge node provided by the embodiment of the present invention includes: at least one PON MAC layer processing unit, configured to process the service layer data to obtain a PON MAC frame; and a first xPON MAC layer processing unit, configured to: The PON MAC frame is processed to obtain an xPON MAC frame, where the PON MAC frame is located in the load of the xPON MAC frame, and the xPON physical layer processing unit is configured to perform xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal. And transmitting the xPON physical layer signal.

 The technical solution of the embodiment of the present invention can carry a P0N media access control (MAC) frame to the load of the xPON MAC frame, and transmit the xPON MAC frame through the xPON physical layer, so that the data transmission mode of the PON over xPON can be implemented. However, since the xONU device close to the 0NU replaces the WDM device, the xONU device is usually colorless, that is, there is no need to provide an optical transceiver for each wavelength on the xONU, and if P2MP (Point to multipoint, point to multipoint) is used The xPON can also realize the sharing of optical fibers, so it can effectively extend the optical transmission distance and reduce the data transmission cost. Moreover, the characteristics of xPON can be seen that the data transmission mode of PON over xPON does not need to support burst mode to continuous mode conversion. , so the implementation is simple. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic structural diagram of a data transmission scheme according to an embodiment of the present invention;

2 is a schematic diagram of an embodiment of a data transmission method according to an embodiment of the present invention; 3 is a schematic diagram of another embodiment of a data transmission method according to an embodiment of the present invention;

 4 is a schematic diagram of another embodiment of a data transmission method according to an embodiment of the present invention;

 FIG. 5 is a schematic diagram of another embodiment of a data transmission method according to an embodiment of the present invention; FIG.

 6( a) is a schematic diagram of a PON MAC frame segmentation in an embodiment of the present invention;

 6(b) is a schematic diagram of PON MAC frame recombination according to an embodiment of the present invention;

 7(a) to 7(c) are schematic diagrams of processing a frame header in an embodiment of the present invention;

 FIG. 8( a) is a schematic diagram of a PON MAC frame segmentation according to an embodiment of the present invention;

 FIG. 8(b) is a schematic diagram of PON MAC frame recombination according to an embodiment of the present invention;

 9(a) to 9(c) are schematic diagrams of processing a frame header in an embodiment of the present invention;

 FIG. 10 is a schematic diagram of an embodiment of a data transmission system according to an embodiment of the present invention; FIG.

 11 is a schematic diagram of an embodiment of an operator edge node according to an embodiment of the present invention;

 FIG. 12 is a schematic diagram of another embodiment of an operator edge node according to an embodiment of the present invention;

 FIG. 13 is a schematic diagram of another embodiment of a data transmission method according to an embodiment of the present invention; FIG.

 FIG. 14 is a schematic diagram of another embodiment of a data transmission method according to an embodiment of the present invention; FIG.

 15 is a schematic diagram of another embodiment of an operator edge node according to an embodiment of the present invention;

 FIG. 16 is a schematic structural diagram of an xPON MAC frame according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention provide a data transmission method, system, and carrier edge, which are used to reduce data transmission costs and reduce implementation complexity.

 The solution of the embodiment of the present invention provides a data transmission method of PON over xPON, in which different PON networks are nested, for example, GP0N and next-generation PON (NG-P0N) are nested, where 0NU and 0LT are GP0N devices, and xONU and xOLT are NG-P0N equipment.

 Please refer to FIG. 1, which is a schematic structural diagram of a data transmission scheme according to an embodiment of the present invention. In this embodiment, "PON n" is used to indicate the PON MAC header of the next-level network (for example, TC frame/GEM frame/EP0N MAC frame), and "PON n+1" is used to indicate the PON MAC header of the upper-level network.

The next-level network is represented as P0N in this embodiment, and the upper-level network is represented as xP0N in this embodiment, and the xPON may be NG-P0N (such as NG-GP0N, NG-EP0N) or WDM PON, PON over xPON ( The PON is carried over xPON) to implement different PON network nesting. Among them, xONU and xOLT can be owned by the first operator, 0LT1 can be owned by the second operator, 0LT2 can be owned by the third operator, and the xPON network can be used for multiple operators. Shared. xOLT and OLTl-OLTn can be implemented on the same physical device.

 The Customer Edge Node (CE-Node, Customer Edge Node) is usually composed of 0NU/0NT/0LT of the next-level network and is located at the edge of the user network.

The Provider Edge Node (PE-Node) is usually composed of xONU/xOLT devices and is located at the edge of the carrier network. It is used to add the xPON connection identifier (PON n+1 added) or remove the xPON connection identifier (P0N n+1). Removed ) to aggregate the PON-based connection between the CE-Node and the CE-Node (PON-based Connection, hereinafter referred to as the P0N connection), and the xPON-based tunnel between the PE-Node and the PE-Node (xPON) -based Tunnel ), which ultimately forms a complete P0N-based connection between the CE-Node and the CE-Node.

 The data transmission of the PON over xPON in the embodiment of the present invention is divided into uplink transmission from the CE node to the PE node and downlink transmission from the PE node to the CE node, which are respectively introduced below:

 1. Uplink transmission from the CE node to the PE node:

 Referring to FIG. 2, an embodiment of a data transmission method in an embodiment of the present invention includes:

 201. Process the P0N physical layer signal to obtain a PON MAC frame.

 In this embodiment, the PE node processes the P0N physical layer signal sent by the CE node to obtain the PON MAC frame.

 The PON MAC frame in this embodiment may be a Transmission Convergence (TC) frame, a Gigabit Passive Optical Network Encapsulation Method (GEM), or an EP0N MAC frame, or other A type of PON MAC frame is not limited herein.

 In this embodiment, the process of the PE node processing the P0N physical layer signal to obtain the PON MAC frame is a common knowledge of the person skilled in the art, which is not limited herein.

 202. Process the PON MAC frame to obtain an xPON MAC frame, where the PON MAC frame is located in a load of the xPON MAC frame.

 In this embodiment, after the PE node obtains the PON MAC frame, in order to implement the data transmission mode of the PON over xPON, the PON MAC frame may be processed to obtain an xPON MAC frame, and the PON MAC frame may be carried in the xPON MAC frame. In the load, the specific processing manner will be described in detail in the subsequent embodiments.

 203. Perform an xPON physical layer processing on the xPON MAC frame, and send an xPON physical layer signal.

 After the xPON MAC frame is obtained by the PE node, the xPON MAC frame is processed by the xPON physical layer to obtain the xPON physical layer signal, and the xPON physical layer signal is sent to the PE node at the other end, so that the PON MAC frame can be carried. xPON MAC frames are transmitted in xPON.

In this embodiment, the PE node may carry the PON MAC frame in the load of the xPON MAC frame, that is, according to the PON MAC. The frame generates an xPON MAC frame, and the xPON MAC frame is transmitted through the xPON physical layer, so that the data transmission mode of the PON over xPON can be realized, the optical transmission distance is extended, and the data transmission cost is reduced; and the data transmission mode of the PON over xPON in this embodiment There is no need to support burst mode to continuous mode conversion, which can reduce implementation complexity.

 For the sake of understanding, the uplink transmission process of the foregoing CE node to the PE node is described in detail in a specific example. In this embodiment, the CE node is specifically 0NU, and the PE node is specifically xONU. Referring to FIG. 3, another embodiment of the data transmission method in the embodiment of the present invention includes:

 301. Process the P0N physical layer signal to obtain a PON MAC frame.

 Step 301 in this embodiment is the same as step 201 in the embodiment shown in FIG. 2, and details are not described herein again.

302. Segment or reassemble the PON MAC frame according to the relationship between the length of the PON MAC frame and the preset length threshold.

 In this embodiment, the length of the PON MAC frame can be determined after the PON MAC frame is acquired.

 In this embodiment, a length threshold is set in advance, and the length threshold includes a maximum length threshold and a minimum length threshold, and the length threshold may be related to the load size of the xPON MAC frame, or may be related to other parameters, which is not limited herein.

 After determining the length of the PON MAC frame, the length can be compared to the maximum length threshold and the minimum length threshold.

 The specific comparison process can be:

 Obtain the length of the PON MAC frame;

 Determining whether the length of the PON MAC frame is less than a preset minimum length threshold or greater than a preset maximum length threshold; if the length of the PON MAC frame is less than a preset minimum length threshold, reassembling multiple PON MAC frames, multiple PONs The length of the MAC frame recombination is less than or equal to the maximum length threshold;

 If the length of the P0N MAC frame is greater than a preset maximum length threshold, the PON MAC frame is segmented, and the length of each segment of the P0N MAC frame is greater than or equal to the minimum length threshold.

 303. Generate an xPON MAC frame according to the segmented or reassembled data.

 After segmenting or reassembling the PON MAC frame, the xPON MAC frame may be generated according to the segmented or reassembled data. The specific generation process may be:

 If the PON MAC frame is reassembled, the reassembled PON MAC frame is completely mapped to the load of the xPON MAC frame. The full mapping described herein refers to completely copying the frame header and payload of the PON MAC frame to the xPON MAC. a portion of the load of the frame;

If the PON MAC frame is segmented, multiple PON MAC frames are obtained, each PON MAC frame includes the frame header of the PON MAC frame and the respective segment payload, and then each segmented PON MAC frame is mapped separately. To different xPON The load of the MAC frame;

 After the mapping is completed, an xPON MAC frame is generated by adding a frame header to the payload of the xPON MAC frame.

 It should be noted that if the PON MAC frame is a TC frame, the frame header is a TC frame header. If the PON MAC frame is a GEM frame, the frame header is a GEM frame header, and if the PON MAC frame is an EPON MAC frame, The frame header is an EPON MAC frame preamble;

 If the xPON MAC frame is an xGEM frame, the frame header is an xGEM frame header, which includes a PLI (PDU Length Indicator), a port identifier (Port ID), and a payload type indication (PTI, PDU Type Indicator). Service Type (Type) and Header Error Control (HEC), where Port ID indicates the PON port identifier. The least significant bit of the PTI is used to indicate whether the GEM data frame is the last segment in the segmentation process. For example, setting the PTI to "000" indicates that the segment is not the last segment, assuming PTI is "001" Indicates that the segment is the last segment.

 In this embodiment, a domain of the frame header of the xGEM (such as a PTI field) is used to indicate that the PON MAC frame is reassembled. For example, when the PTI is 111, the load of the xGEM is a reassembly of multiple PON MAC frames.

 In this embodiment, a domain of the xGEM frame header (such as a Type field) may be used to indicate a payload service type of the xGEM frame. For example, the payload may be a TC/GEM frame of the GP0N or an LLID identifier of the EP0N. The EPON MAC frame may also be a TC/xGEM frame of the NG-GP0N or an NG-EP0N MAC frame identified by the LLID of the NG-EP0N.

 If the xPON MAC frame is an NG-EP0N MAC frame, the frame header is an Ethernet MAC frame header with an NG-EP0N frame preamble.

 In this embodiment, the payload service type of the NG-EP0N MAC frame may also be indicated by extending a certain field of the frame header of the NG-EP0N MAC frame, such as an EthernetType (domain type) field or a subtype (subtype) field. For example, the payload may be a TC/GEM frame of the GP0N or an EPON MAC frame identified by the LLID of the EP0N, or a TC/xGEM frame of the NG-GP0N or an NG-EP0N MAC frame identified by the LLID of the NG-EP0N. .

 In this embodiment, the NG-EP0N MAC frame preamble may be used to indicate reassembly of the PON MAC frame. In this embodiment, the PON MAC frame before processing by the PE node may be referred to as "C-P0N (Customer P0N)", and the corresponding GP0N encapsulation mode port identifier (GPID, GEM Port ID) / logical link identifier (LLID, Logical) Link Identifier) is the inner connection identifier (ie PON-based Connection), GP0N is called "C-GEM (Customer GEM or Inner GEM)", and EPON is called "C-LLID (Customer LLID or Inner LLID)" ;

The xPON MAC frame processed by the PE node may be referred to as "S-P0N (Service PON)", the added xPON connection identifier is the outer connection identifier (ie, the xPON-based Tunnel identifier), and the NG-GP0N is called "S- GEM (Service GEM or Outer GEM)", for NG-EP0N called "S-LLID (Service LLID or Outer LLID) ".

 In this embodiment, the GEM frame is a C-GEM frame, the EPON MAC frame is the frame where the C-LLID is located, the xGEM frame is the S-GEM frame, and the NG-EPON MAC frame is the frame where the S-LLID is located.

 In this embodiment, for PON over xGEM, an xGEM frame header may be added to the PON MAC frame to obtain an xGEM frame, and a PON-based Connection may be aggregated into the xPON-based tunnel, thereby implementing a TC/GEM/EPON MAC frame over xGEM (TC/ GEM frame/EPON MAC frame is carried in xGEM frame);

 For PON over NG-EPON, an Ethernet frame header with an NG-EPON MAC frame preamble can be added to the PON MAC frame to obtain an NG-EPON MAC frame, and the PON-based Connection is aggregated into the xPON-based Tunnel to implement the TC. /GEM/EPON MAC frame over NG-EPON MAC frame.

 304. Perform an xPON physical layer processing and send an xPON physical layer signal.

 Step 304 in this embodiment is the same as step 203 in the embodiment shown in FIG. 2, and details are not described herein again. In this embodiment, the PE node xONU can reassemble or segment the PON MAC frame, generate an xPON MAC frame according to the reassembled or segmented data, and transmit the xPON MAC frame through the xPON physical layer, thereby implementing PON over xPON data. The transmission mode, because the xONU device close to the 0NU replaces the WDM device in the 0TN, and the xONU device is usually colorless, and does not need to provide an optical transceiver for each wavelength on the xONU, thereby effectively extending the optical transmission distance. The data transmission cost of the PON over xPON in this embodiment does not need to support the transition from the burst mode to the continuous mode, which can reduce the implementation complexity.

 Second, the downlink transmission from the PE node to the CE node:

 Referring to FIG. 4, another embodiment of the data transmission method in the embodiment of the present invention includes:

 401. Process the xPON physical layer signal to obtain an xPON MAC frame.

 In this embodiment, the PE node processes the received xPON physical layer signal to obtain an xPON MAC frame.

 The xPON MAC frame in this embodiment may be an xTC frame (a TC frame of an NG GP0N), an xGEM frame, an NG-EPON MAC frame, or another type of xPON MAC frame, which is not limited herein.

 In this embodiment, the process of processing the received xPON physical layer signal by the PE node to obtain the xPON MAC frame is a common knowledge of those skilled in the art, which is not limited herein.

 402. Read data in a load of an xPON MAC frame.

 After obtaining the xPON MAC frame, in order to implement downlink transmission from the PE to the CE, the PON MAC frame needs to be acquired from the xPON MAC frame, because in the uplink transmission from the CE to the PE, the PON MAC frame is located in the load of the xPON MAC frame. Medium, so the data in the payload of the xPON MAC frame can be read first.

403. Process the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PON MAC. frame.

 In this embodiment, after the data in the payload of the xPON MAC frame is acquired, the PON MAC frame can be read from the frame header of the xPON MAC frame, and the specific manner will be described in detail in the following embodiments.

 404. Perform P0N physical layer processing, and send a P0N physical layer signal.

 After the PE node reads the PON MAC frame, the PON MAC frame can be processed by the P0N physical layer.

The P0N physical layer signal transmits the P0N physical layer signal to the CE node, so that the PON MAC frame can be transmitted from the xPON to the P0N.

 In this embodiment, the PE node reads the PON MAC frame from the load of the xPON MAC frame, and transmits the P0N MAC frame through the P0N physical layer, thereby implementing the data transmission mode of the PON over xPON, extending the optical transmission distance, and reducing the data transmission. Cost; and the data transmission mode of the PON over xPON in this embodiment does not need to support the transition from burst mode to continuous mode, and the implementation complexity can be reduced.

 For the sake of understanding, the downlink transmission process of the foregoing PE node to the CE node is described in detail in a specific example. Referring to FIG. 5, another embodiment of the data transmission method in the embodiment of the present invention includes:

 501. Processing an xPON physical layer signal to obtain an xPON MAC frame.

 The PE node xONU acquires an xPON physical layer signal transmitted from the PE node xOLT at the other end, and processes the xPON physical layer signal to obtain an xPON MAC frame.

 502~503: segment or reassemble data in the payload of the xPON MAC frame according to the frame header of the xPON MAC frame, and delete the frame header of the xPON MAC frame to obtain the PON MAC frame.

 After acquiring the data in the payload of the xPON MAC frame, the PE node xONU can segment or reassemble the data in the payload of the xPON MAC frame according to the frame header of the xPON MAC frame, and delete the frame header of the xPON MAC frame. To the IJ P0N MAC frame, there are the following cases:

 A. When the frame header of the xPON MAC frame indicates that the payload is a PON MAC frame, and the load of one xPON MAC frame includes multiple complete PON MAC frames, the frame header of the xPON MAC frame is deleted, and according to the load of the xPON MAC frame The header of the PON MAC frame segments the data in the payload of the xPON MAC frame to obtain multiple PON MAC frames:

 For example, a domain of the xGEM frame header (such as a Type field) may be used to indicate the payload service type of the xGEM frame, or by extending a certain field of the frame header of the NG-EPON MAC frame, such as an EthernetType domain. Or subtype (subtype) field, to indicate the payload service type of the NG-EPON MAC frame.

 For example, if the received xPON MAC frame is an xGEM frame, and the PTI in the frame header of the xGEM frame is 111, it indicates that the xGEM frame is recombined by multiple P0N MAC frames, and the frame header of the xGEM frame can be directly deleted. A plurality of PON MAC frames can be determined by dividing the header of the PON MAC frame in the payload of the xGEM frame.

B. When the frame header of the xPON MAC frame indicates that the payload is a PON MAC frame, and the load of one xPON MAC frame is included When part of the data of one PON MAC frame is included, multiple xPON MAC frames are determined according to the frame header of the xPON MAC frame, the frame headers of the determined plurality of xPON MAC frames are deleted, and the data of the loads of the plurality of xPON MAC frames are combined. A PON MAC frame:

 For example, if the received xPON MAC frame is an xGEM frame, and the PTI in the frame header of the xGEM frame is 000, it indicates that the load of the xGEM frame includes part of data of one PON MAC frame, that is, by one PON MAC frame segmentation. If the PTI is 001, the frame header of the xGEM frame is deleted, and the data of the load is combined and combined to obtain a PON MAC frame.

 It should be noted that the foregoing xPON MAC frame may be an xGEM frame, or an NG-EP0N MAC frame, and the foregoing P0N MAC frame may be a TC frame, or a GEM frame, or an EP0N MAC frame.

 In this embodiment, for the PON over xGEM, the xGEM frame header may be removed from the xGEM frame processed by the xPON physical layer, and the PON-based Connection may be separated from the xPON-based tunnel, thereby implementing the TC/GEM/EP0N MAC frame over xGEM. (TC/GEM frame/EP0N MAC frame is carried in xGEM frame);

 For the PON over NG-EP0N, the NG-EP0N MAC frame preamble can be deleted from the NG-EP0N MAC frame processed by the NG-EP0N physical layer to obtain the TC/GEM frame/EP0N MAC frame, which is sent out from the xPON-based tunnel. PON-based Connection, thus implementing TC/GEM/EP0N MAC frame over NG-EP0N MAC frame.

 504. Perform PON physical layer processing, and send a P0N physical layer signal.

 Step 504 in this embodiment is the same as step 404 in the embodiment shown in FIG. 4, and details are not described herein again. In this embodiment, the xONU receives the xPON physical layer signal from the xOLT, converts the xPON physical layer signal into an xPON MAC frame, reads the PON MAC frame from the load of the xPON MAC frame, and transmits the P0N MAC through the P0N physical layer. The frame can implement the data transmission mode of PON over xPON, and since the xONU device close to the ONU replaces the WDM device in the 0TN, and the xONU device is usually colorless, there is no need to provide an optical transceiver for each wavelength on the xONU. Therefore, the optical transmission distance can be effectively extended, and the data transmission cost can be reduced; and the data transmission mode of the PON over xPON does not need to support the transition from the burst mode to the continuous mode, which can reduce the implementation complexity.

 For ease of understanding, the following uplink and downlink data transmission processes are described by two specific examples:

 (1) The PON MAC frame is a TC/GEM/EP0N MAC frame, and the xPON MAC frame is an xGEM frame:

 Upstream process:

 Al, processing the P0N physical layer signal to obtain a TC/GEM frame/EP0N MAC frame;

 A2, GTC framing processing;

 Step a2 in this embodiment may include two steps of mapping and framing:

A21. Segment or recombine the TC/GEM/EP0N MAC frame, and map each segment or reassembly to an xGEM. The load of the frame.

 For details, please refer to Figure 6 (a) and Figure 6 (b). Figure 6 (a) shows the schematic diagram of the segmentation process. The TC/EPON MAC frame is divided into multiple segments, and the TC/EPON MAC of each segment. The frame data is respectively mapped to a load portion of an xGEM frame, and each segment is duplicated with a TC frame header/EPON MAC frame preamble;

 Figure 6 (b) shows a schematic diagram of reassembly processing. Multiple TC/EPON MAC frames are simply combined, and their respective TC header/EPON MAC frame preambles are reserved and mapped to the payload portion of an xGEM frame.

 A22. Each segment or reassembly adds an xGEM frame header to form an xGEM frame.

 After the TC/GEM/EPON MAC frame is segmented or reassembled, the TC/GEM/EPON MAC frame data of each segment or reassembly is mapped to the payload part of the xGEM frame, and then the xGEM frame header is added, and the Type field is filled in to indicate that the load is TC/ GEM/EPON MAC frame, fill in the PTI to indicate segmentation or reassembly, that is, constitute an xGEM frame.

 A3. Send each xGEM frame through the xPON physical layer in order.

 Downstream process:

 b 1. Processing the xPON physical layer signal to obtain an xGEM frame.

 B2. Take out the payload part of the xGEM frame.

 B3. Recombining multiple extracted data of the xGEM frame according to the Type field and the PTI of the xGEM frame,

TC/GEM/EPON MAC frame.

 B4. The TC/GEM/EPON MAC frame is processed by the P0N physical layer and sent to the CE.

 In this embodiment, the frame header of the xGEM frame needs to be processed in both the uplink and downlink directions. The specific processing procedure can be as shown in Figure 7 (a) to Figure 7 (c):

 Figure 7 (a) shows the uplink data transmission mode of EPON MAC over xGEM (similar to the downlink), where xONU does the processing of adding xGEM headers, and xOLT does the processing of removing xGEM headers.

 Figure 7 (b) shows the uplink data transmission mode of TC over xGEM. The xONU performs the processing of adding the xGEM frame header, and the xOLT performs the processing of removing the xGEM frame header.

 Figure 7 (c) shows the downlink data transmission mode of TC over xGEM, where xOLT does the processing of adding xGEM frame headers, and xONU does the processing of removing xGEM frame headers.

 (2) The PON MAC frame is a TC/GEM/EPON MAC frame, and the xPON MAC frame is an NG-EP0N MAC frame: Uplink process:

 Al. Process the P0N physical layer signal to obtain a TC/GEM frame/EPON MAC frame.

 A2, Coordination sublayer (RS, Reconci iation Sublayer) processing.

 Step a2 in this embodiment may include two steps of mapping and framing:

A21. Segment or recombine the TC/GEM frame/EPON MAC frame, and map each segment or reassembly to one The load of the NG-EPON MAC frame.

 For details, please refer to FIG. 8( a ) and FIG. 8 ( b ). FIG. 8( a ) is a schematic diagram of segmentation processing, and the TC/GEM frame is divided into multiple segments, and the TC/GEM frames of each segment are shown. The data is mapped to the payload portion of an NG-EPON MAC frame, and each segment is duplicated with a TC/GEM frame header.

 Figure 8 (b) shows a schematic diagram of the reassembly process. Multiple TC/GEM frames are simply combined, and the respective TC/GEM frame headers are reserved and mapped to the payload portion of an NG-EPON MAC frame.

 A22. Add an Ethernet frame header with an NG-EPON MAC frame preamble for each segment or reassembly, fill in the EthernetType field to indicate that the payload is a TC/GEM/EP0N MAC frame, and modify the preamble to indicate segmentation or reassembly to form an NG. - EPON MAC frame.

 After TC/GEM/EP0N MAC frame segmentation or reassembly, each segment or recombined TC/GEM frame data is mapped to NG-EP0N.

The payload portion of the MAC frame is further added with an Ethernet frame header with an NG-EPON MAC frame preamble, which constitutes an NG-EP0N MAC frame. An NG-EPON MAC frame preamble includes LLID delimiter start (SLD, 8 bits), LLID (16 bits), and cyclic redundancy check (CRC, 8 bits).

 A3. Send each NG-EPON MAC frame through the xPON physical layer in order.

 Downstream process:

 b l. Processing the xPON physical layer signal to obtain an NG-EPON MAC frame.

 B2. The Ethernet frame header with the NG-EPON MAC frame preamble is removed to obtain the TC/GEM/EP0N MAC frame.

 B3. Reassemble the multiple extracted data of the NG-EPON MAC frame preamble according to the NG-EPON MAC frame preamble to obtain a TC/GEM/EP0N MAC frame.

 B4. Perform the P0N physical layer processing on the TC/GEM/EP0N MAC frame to the CE.

 In this embodiment, the frame header of the NG-EPON MAC frame needs to be processed in both the uplink and downlink directions. The specific processing procedure can be as shown in Figure 9 (a) to Figure 9 (c):

 Figure 9 (a) shows the uplink data transmission mode of the GEM over NG-EPON MAC (similar to the downlink). The xONU adds the NG-EPON MAC header, and the xOLT removes the NG-EP0N MAC header.

 Figure 9 (b) shows the uplink data transmission mode of TC over NG-EPON MAC, where xONU adds NG-EP0N

The processing of the MAC frame header, xOLT does the processing of removing the NG-EPON MAC frame header.

 Figure 9 (c) shows the downlink data transmission mode of the TC over NG-EPON MAC. The xOLT performs the processing of adding the NG-EP0N MAC frame header, and the xONU performs the processing of removing the NG-EPON MAC frame header.

 The following describes the data transmission system in the embodiment of the present invention. Referring to FIG. 10, the data transmission system in the embodiment of the present invention includes:

The user edge node 1001 is configured to receive data sent by the user terminal, and pass the data through the P0N physical layer. The number is sent to the operator edge node 1002;

 The operator edge node 1002 is configured to process the P0N physical layer signal sent by the user edge node 1001 to obtain a PON MAC frame sent by the user edge node 1001, and process the PON MAC frame to obtain an xPON MAC frame, so that the PON MAC frame is located at the xPON MAC. In the payload of the frame, the xPON physical layer is processed by the xPON physical layer to obtain the xPON physical layer signal, and the xPON physical layer signal is transmitted.

 In this embodiment, the user edge node 1001 may include 0NU and 0LT, and the operator edge node 1002 may include xOUN and x0LT.

 The PON MAC frame and the xPON MAC frame in this embodiment have the same meanings as the PON MAC frame and the xPON MAC frame in the foregoing embodiment, and are not described herein again.

 The uplink data transmission mode of the user edge node 1001 to the operator edge node 1002 is described in this embodiment. The following describes the downlink data transmission mode from the operator edge node 1002 to the user edge node 1001. Referring also to FIG. 10, the present invention is also provided. Another embodiment of the communication system in the embodiment includes:

 The operator edge node 1002 is configured to process the received xPON physical layer signal to obtain an xPON MAC frame, read data in a load of the xPON MAC frame, and use data in a load of the xPON MAC frame according to a frame header of the xPON MAC frame. Processing to obtain a PON MAC frame, performing a P0N physical layer processing on the PON MAC frame to obtain a P0N physical layer signal, and transmitting a P0N physical layer signal;

 The user edge node 1001 is configured to receive a P0N physical layer signal sent by the operator edge node 1002.

 In this embodiment, the user edge node 1001 may include 0NU and 0LT, and the operator edge node 1002 may include xOUN and x0LT.

 The PON MAC frame and the xPON MAC frame in this embodiment are the PON MAC frame and the xPON in the foregoing embodiment.

The meanings of the MAC frames are the same and will not be described here.

 In this embodiment, the operator edge node 1002 can convert the PON MAC frame and the xPON MAC frame to each other, and can transmit the xPON MAC frame through the xPON physical layer and transmit the PON MAC frame through the P0N physical layer, thereby realizing

The data transmission mode of the PON over xPON extends the optical transmission distance and effectively reduces the data transmission cost. Moreover, the data transmission mode of the PON over xPON in this embodiment does not need to support the burst mode to the continuous mode conversion, which can reduce the implementation complexity.

 The following describes an embodiment of a carrier edge node in the embodiment of the present invention. Referring to FIG. 11, an embodiment of a carrier edge node in the embodiment of the present invention includes:

 The P0N physical layer processing unit 1101 is configured to process a P0N (for example, GP0N or EP0N) physical layer signal to obtain a PON MAC frame.

A framing processing unit 1103, configured to process a PON MAC frame to obtain an xPON MAC frame, and a PON MAC frame bit In the load of the xPON MAC frame;

 For example, for PON over xGEM, an xGEM frame header can be added to a PON MAC frame to obtain an xGEM frame, and a PON-based Connection can be aggregated into an xPON-based tunnel to implement a TC/GEM/EPON MAC frame over xGEM (TC/GEM frame/EPON). The MAC frame is carried in the xGEM frame);

 For example, for PON over NG-EP0N, an Ethernet frame header with an NG-EPON MAC frame preamble can be added to the PON MAC frame to obtain an NG-EPON MAC frame, and the PON-based Connection is aggregated into the xPON-based tunnel. TC/GEM/EPON MAC frame over NG-EPON MAC frame.

 The xPON physical layer processing unit 1104 is configured to perform xPON (for example, 10G-GP0N or 10G-EP0N) physical layer processing on the xPON MAC frame, obtain an xPON physical layer signal, and send the xPON physical layer signal.

 The carrier edge node in this embodiment may further include:

 The multiplexing unit 1102 is configured to segment or reassemble the PON MAC frame according to the relationship between the length of the PON MAC frame obtained by the P0N physical layer processing unit 1101 and the preset length threshold, and the segmented or reassembled PON MAC The frame is sent to the framing processing unit 1103 for processing.

 In this embodiment, the uplink data transmission mode from the CE node to the PE node is described. For ease of understanding, the following describes a specific application scenario:

 In this embodiment, the P0N physical layer processing unit 1101 processes the P0N physical layer signal to obtain the P0N MAC frame.

 After acquiring the PON MAC frame, the multiplexing unit 1102 can determine its length, compare the length with a preset maximum length threshold and a minimum length threshold, and segment or reassemble the PON MAC frame according to the comparison result.

 The maximum length threshold and the minimum length threshold are preset values, which are related to the actual application, and are not limited herein.

 The specific comparison process is consistent with the comparison process described in the foregoing method embodiment shown in FIG. 3, and will not be described again here.

 After the multiplexing unit 1102 segments or reassembles the PON MAC frame, the framing processing unit 1103 may generate an xPON MAC frame according to the segmented or recombined data, and the specific generation process is described in the foregoing method embodiment shown in FIG. The generation process is consistent and will not be described here.

 After the framing processing unit 1103 obtains the xPON MAC frame, the xPON physical layer processing unit 1104 can perform the xPON physical layer processing on the xPON MAC frame to obtain the xPON physical layer signal, and send the xPON physical layer signal, thereby implementing carrying the PON. The xPON MAC frame of the MAC frame is transmitted in xPON.

In this embodiment, the multiplexing unit 1102 may reassemble or segment the P0N MAC frame, and the framing processing unit 1103 Generating an xPON MAC frame according to the reassembled or segmented data, and the xPON physical layer processing unit 1104 transmits the xPON MAC frame through the xPON physical layer, so that the data transmission mode of the PON over xPON can be implemented, and the data transmission cost is effectively reduced; In the example, the data transmission mode of PON over xPON does not need to support burst mode to continuous mode conversion, which can reduce implementation complexity.

 Referring to FIG. 12, another embodiment of the carrier edge node in the embodiment of the present invention includes:

 The xPON physical layer processing unit 1201 is configured to process an xPON (for example, 10G-GP0N or 10G-EP0N) physical layer signal to obtain an xPON MAC frame;

 The framing processing unit 1203 is configured to read data in the payload of the xPON MAC frame, and process the data in the payload of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain a PON MAC frame;

 For example, for PON over xGEM, the xGEM frame header can be removed from the xGEM frame processed by the xPON physical layer, and the PON-based Connection can be separated from the xPON-based Tunnel, thereby implementing the TC/GEM/EP0N MAC frame over xGEM (TC/GEM). Frame/EPON MAC frame is carried in xGEM frame);

 For example, for PON over NG-EP0N, the NG-EP0N MAC frame preamble can be deleted from the NG-EP0N MAC frame processed by the NG-EP0N physical layer to obtain a TC/GEM frame/EPON MAC frame, which is divided into xPON-based tunnels. A PON-based Connection is issued to implement a TC/GEM/EP0N MAC frame over NG-EP0N MAC frame.

 The PON physical layer processing unit 1204 is configured to perform P0N (for example, GP0N or EP0N) physical layer processing on the PON MAC frame, obtain a P0N physical layer signal, and send the P0N physical layer signal;

 For the GP0N, the GPM sublayer function of the GP0N is completed. When the P0N data link layer frame is a GTC TC frame, the preamble of the GTC TC frame needs to be regenerated. For the EP0N, the PHY layer function of the EP0N is completed, including the PDM and the PMA. When the PCS and P0N data link layer frames are EPON MAC frames, the preamble of the EPON MAC frame needs to be regenerated.

 The carrier edge node in this embodiment may further include:

 The demultiplexing unit 1202 is configured to segment or recombine data in the payload of the xPON MAC frame obtained by the xPON physical layer processing unit 1201, and send the segmented or reassembled data to the framing processing unit 1203 for processing.

 The uplink data transmission mode from the PE node to the CE node is described in this embodiment. To facilitate understanding, the following describes a specific application scenario:

 In this embodiment, the xPON physical layer processing unit 1201 processes the xPON physical layer signal to obtain an xPON MAC frame.

 The xPON MAC frame in this embodiment may be an xGEM frame, an NG-EP0N MAC frame, or another type of xPON MAC frame, which is not limited herein.

In this embodiment, the xPON physical layer processing unit 1201 processes the xPON physical layer signal to obtain an xPON MAC. The process of the frame is common knowledge of those skilled in the art, and is not limited herein.

 After the xPON physical layer processing unit 1201 acquires the data in the payload of the xPON MAC frame, the demultiplexing unit 1202 may segment or reassemble the data in the payload of the xPON MAC frame according to the frame header of the xPON MAC frame, and frame the data. The processing unit 1203 obtains the PON MAC frame by deleting the frame header of the xPON MAC frame. The specific process is consistent with the process described in the foregoing embodiment shown in FIG. 5, and details are not described herein again.

 After the framing processing unit 1203 reads the P0N MAC frame, the P0N physical layer processing unit 1204 can perform the P0N physical layer processing to obtain the P0N physical layer signal, and transmit the P0N physical layer signal, so that the PON MAC frame can be transmitted from the xPON. To P0N.

 In this embodiment, the demultiplexing unit 1202 may reassemble or segment the PON MAC frame, and the framing processing unit 1203 generates an xPON MAC frame according to the reassembled or segmented data, and the P0N physical layer processing unit 1204 transmits the PON MAC layer through the xPON physical layer. The xPON MAC frame can implement the data transmission mode of the PON over xPON and reduce the data transmission cost. In this embodiment, the data transmission mode of the PON over xPON does not need to support the burst mode to the continuous mode conversion, which can reduce the implementation complexity. .

 Another embodiment of the present invention provides a data transmission method, as shown in FIG. 13, including:

 1301. Processing the service layer data to obtain a PON MAC frame;

 In this embodiment, the service layer data may be an IP data packet, an Ethernet frame, or a time division multiplexed data packet. In the actual application, the P0N MAC frame may be a Transmission Convergence (TC) frame, or a Gigabit Passive Optical Network Encapsulation (GEM) mode, or an EP0N MAC frame, or Other types of PON MAC frames are not limited herein.

 In this embodiment, the process in which the PE node xOLT encapsulates the data to obtain the PON MAC frame is a common knowledge of those skilled in the art, which is not limited herein.

 1302: Processing a PON MAC frame to obtain an xPON MAC frame, so that the PON MAC frame is located in a load of the xPON MAC frame;

In this embodiment, after the PE node processes the received data and obtains the PON MAC frame, in order to implement the data transmission mode of the PON over xPON, the P0N MAC frame may be processed to obtain an xPON MAC frame, and the P0N MAC frame may be carried. In the load of the xPON MAC frame, for example, an xGEM frame header may be added to the PON MAC frame to obtain an xGEM frame, and the P0N-based connection is aggregated into the xPON-based tunnel, thereby implementing the TC/GEM/EP0N MAC frame over xGEM (TC/GEM). /EP0N MAC frame is carried in the xGEM frame); for example, an Ethernet frame header with an NG-EP0N MAC frame preamble can be added to the PON MAC frame to obtain an NG-EP0N MAC frame, thereby implementing a TC/GEM/EP0N MAC frame. It is carried in the NG-EP0N MAC frame. In the process of processing the PON MAC frame to obtain an xPON MAC frame, the PON MAC frame may also be segmented or reassembled according to the content in the foregoing embodiment. In order to make the xPON MAC frame transparent to the bearer of the PON MAC, that is, the transmission delay of all the data on the xPON is the same, in the embodiment of the present invention, a method for encapsulating the xPON MAC frame is provided, so that the xPON MAC frame structure is configured according to The P0N bandwidth divides a fixed transport byte block (data partition in the figure) for each P0N, and ensures that the order of these byte blocks does not change. As shown in FIG. 16, when the bandwidth of the xPON is 4 times of the bandwidth of the P0N and the PON MAC frame is the TC frame, the encapsulated xPON TC frame includes 4 fixed PON TC frame data partitions.

 1303. Perform an xPON physical layer processing on the xPON MAC frame, and send an xPON physical layer signal.

 After the xPON MAC frame is obtained by the PE node xOLT, the xPON MAC frame can be processed by the xPON physical layer to obtain the xPON physical layer signal, and the xPON physical layer signal is sent to the PE node x0NU at the other end, so that the PON MAC can be carried. The xPON MAC frame of the frame is transmitted in xPON.

 The foregoing embodiments of the present invention can implement the interworking between the optical network device and other devices that send the service layer data, and can carry the PON MAC frame to the load of the xPON MAC frame, and transmit the xPON MAC frame through the xPON physical layer, so The data transmission mode of the PON over xPON extends the optical transmission distance and reduces the data transmission cost. In this embodiment, the data transmission mode of the PON over xPON does not need to support the burst mode to the continuous mode conversion, thereby reducing the implementation complexity.

 Another data transmission method is provided in the embodiment of the present invention, including:

 1401: Receive an xPON physical layer signal, and process the xPON physical layer signal to obtain an xPON MAC frame. In this embodiment, the PE node xOLT processes the received xPON physical layer signal to obtain the xPON.

MAC frame.

 The xPON MAC frame in this embodiment may be an xTC frame (a TC frame of an NG GP0N), an xGEM frame, an NG-EP0N MAC frame, or other types of xPON MAC frames, which is not limited herein.

 In this embodiment, the process of processing the received xPON physical layer signal by the PE node xOLT to obtain the xPON MAC frame is common knowledge of those skilled in the art, which is not limited herein.

 1402. Reading data in a load of an xPON MAC frame;

 After acquiring the xPON MAC frame, in order to transmit the data to other non-optical network devices through the PON, it is necessary to obtain the PON MAC frame from the xPON MAC frame, because in the transmission of the PON over xPON, the PON MAC frame is located in the xPON MAC frame. In the load, the data in the payload of the xPON MAC frame can be read first.

 1403. Process the data in the payload of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain a PON MAC frame.

In this embodiment, after acquiring the data in the payload of the xPON MAC frame, the xOLT can read the PON MAC frame from the frame header of the xPON MAC frame. For the specific manner, refer to the foregoing embodiment. If the P0N MAC frame is segmented or reassembled at the xONU, the xOLT also needs to perform corresponding data on the payload of the xPON MAC frame. Reorganize or segment to get the correct PON MAC frame.

 1404. Process the obtained PON MAC frame to obtain service layer data and send the data.

 After the PE node xOLT obtains the PON MAC frame from the xPON MAC frame, the PON MAC frame is processed to obtain the service layer data that can be transmitted by the network device connected to the PE node and sent. For example, if the xOLT is connected to an Ethernet, the PON MAC frame needs to be processed to get an Ethernet frame, which is then sent to the Ethernet connected to the xOLT.

 In this embodiment, the xOLT can read the PON MAC frame from the load of the xPON MAC frame, and then generate and transmit the service layer data of the P0N MAC frame, thereby implementing the data transmission mode of the PON over xPON, extending the optical transmission distance, and reducing Data transmission cost; and in this embodiment, the data transmission mode of the PON over xPON does not need to support the transition from the burst mode to the continuous mode, which reduces the implementation complexity.

 The embodiment of the present invention further provides an operator edge node, which is used to implement the method shown in FIG. 13 and/or FIG. 14 . The operator edge node is as shown in FIG. 15 and includes:

 The at least one PON MAC layer processing unit 1501 is configured to process the service layer data to obtain a PON MAC frame, where the service layer data may be an IP packet or an Ethernet frame.

 The first xPON MAC layer processing unit 1503 is configured to process the PON MAC frame obtained by the PON MAC layer processing unit 1501 to obtain an xPON MAC frame, where the PON MAC frame is located in a load of the xPON MAC frame. For the specific processing method, refer to the foregoing embodiment.

 When the carrier edge node includes two or more PON MAC layer processing units, in order to make the xPON MAC frame transparent to the PON MAC bearer, that is, the transmission delay of all data on the xPON is the same, In the embodiment of the present invention, a method for encapsulating an xPON MAC frame is provided. The xPON MAC frame structure is divided into fixed transmission byte blocks (data partitions in the figure) for each P0N according to the P0N bandwidth, and the byte blocks are guaranteed. The order is unchanged. As shown in Figure 16, when the bandwidth of the xPON is 4 times the bandwidth of the P0N and the P0N MAC frame is a TC frame, the encapsulated xPON TC frame includes four fixed PON TC frame data partitions.

 The xPON physical layer processing unit 1504 is configured to process the xPON MAC frame, obtain an xPON physical layer signal, and send the xPON physical layer signal.

 The carrier edge node in this embodiment may further include:

 The multiplexing/demultiplexing unit 1502 is configured to segment or reassemble the PON MAC frame according to the relationship between the length of the PON MAC frame obtained by the PON MAC layer processing unit 1501 and the preset length threshold, and segment or reorganize the PON MAC frame. The subsequent P0N MAC frame is sent to the first xPON MAC layer processing unit 1503 for processing.

The xPON physical layer processing unit 1504 in the operator edge node in the embodiment of the present invention may also be configured to convert the received xPON physical layer signal into an xPON MAC frame. The operator edge node in this embodiment may further include: a second xPON MAC frame processing unit 1505, configured to read data in a load of the xPON MAC frame obtained by the X P0N physical layer processing unit 1504, according to the xPON MAC frame The data processing in the payload of the xPON MAC frame is obtained by the frame header. The specific processing method may refer to the foregoing embodiment. When the carrier edge node includes the multiplexing/demultiplexing unit 1502, the multiplexing/resolving The unit 1502 is further configured to segment or recombine the data in the payload of the xPON MAC frame obtained by the second xPON MAC frame processing unit 1505, and send the segmented or reassembled data to the PON MAC frame processing unit 1501 for processing. The PON MAC frame processing unit is further configured to process the received PON MAC frame to obtain service layer data.

 The first xPON MAC layer processing unit 1503 and the second xPON MAC layer processing unit 1505 in the foregoing embodiment of the present invention may be separately disposed, or may be disposed in the same module, where the multiplexing/demultiplexing unit 1502 may also be separately set. A multiplexing unit and a demultiplexing unit.

 In this embodiment, the operator edge node can read the PON MAC frame from the load of the xPON MAC frame, and then generate and transmit the service layer data of the PON MAC frame, thereby implementing the PON over xPON data transmission mode and extending the optical transmission. The data transmission cost of the PON over xPON does not need to support the transition from the burst mode to the continuous mode, which reduces the implementation complexity.

 A person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium, the above mentioned storage. The medium can be a read only memory, a magnetic disk or a compact disk or the like.

 The data transmission method, system and related equipment provided by the present invention are described in detail above. For those skilled in the art, according to the idea of the embodiment of the present invention, the specific implementation manner and the application range may be changed. In the above, the contents of this specification are not to be construed as limiting the invention.

Claims

Rights request

A data transmission method, comprising:

 Processing the P0N physical layer signal of the passive optical network to obtain a P0N media access control MAC frame;

 Processing the PON MAC frame to obtain a next-generation passive optical network xPON medium access control MAC frame, where the PON MAC frame is located in a load of the xPON MAC frame;

 Performing an xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and transmitting the xPON physical layer signal.

 2. The method according to claim 1, wherein the processing the PON MAC frame to obtain the next generation passive optical network xPON medium access control MAC frame comprises:

 And segmenting or recombining the PON MAC frame according to a relationship between a length of the PON MAC frame and a preset length threshold;

 An xPON MAC frame is generated from the segmented or reassembled data, the data of each segment or reassembly being located at the load of the xPON MAC frame.

 The method according to claim 2, wherein the segmenting or recombining the PON MAC frame according to a relationship between a length of the PON MAC frame and a preset length threshold includes:

 Obtaining a length of the PON MAC frame;

 Determining whether the length of the PON MAC frame is less than a preset minimum length threshold or greater than a preset maximum length threshold;

 And if the length of the P0N MAC frame is less than a preset minimum length threshold, recombining a plurality of P0N MAC frames, where a length of the multiple PON MAC frames after reassembly is less than or equal to a maximum length threshold;

 And if the length of the P0N MAC frame is greater than a preset maximum length threshold, the P0N MAC frame is segmented, and a length of each segment of the PON MAC frame is greater than or equal to a minimum length threshold.

 4. The method of claim 2, wherein the generating the xPON MAC frame based on the segmented or reassembled data comprises:

 Fully mapping the reassembled PON MAC frame to the payload of the xPON MAC frame, or mapping each segment of the PON MAC frame to a load of a different xPON MAC frame;

 An xPON MAC frame is generated by adding a frame header to the load of the xPON MAC frame.

 5. The method of claim 4, wherein

 The frame header includes a payload type indicating PTI or a preamble, and the payload type indicates that the PTI or the preamble is used to indicate that the load of the xPON MAC frame includes a PON MAC frame;

or, The frame header includes a service type parameter field or a new parameter field, where the service type parameter field or the newly added parameter field is used to indicate that the load of the xPON MAC frame includes a PON MAC frame.

 6. A data transmission method, comprising:

 Processing the xPON physical layer signal to obtain an xPON MAC frame;

 Reading data in a load of the xPON MAC frame;

 Processing, according to a frame header of the xPON MAC frame, data in a payload of the xPON MAC frame to obtain a P0N MAC frame;

 Performing a P0N physical layer processing on the PON MAC frame to obtain a P0N physical layer signal, and transmitting the P0N physical layer signal.

 The method according to claim 6, wherein the processing the data in the payload of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PON MAC frame comprises:

 Deleting a frame header of the xPON MAC frame when a header of the xPON MAC frame indicates that a load of an xPON MAC frame includes a plurality of complete PON MAC frames;

 And segmenting data in a load of the xPON MAC frame according to a frame header of a PON MAC frame in a load of the xPON MAC frame to obtain a plurality of PON MAC frames;

 Or,

 When a header of the xPON MAC frame indicates that a load of an xPON MAC frame includes part of data of a PON MAC frame, determining a plurality of xPON MAC frames according to a frame header of the xPON MAC frame;

 Deleting the determined headers of the plurality of xPON MAC frames, and combining the data of the loads of the plurality of xPON MAC frames to obtain one PON MAC frame.

 8. A data transmission system, comprising:

 a user edge node, configured to receive data sent by the user terminal side, and send the data to an operator edge node;

 The operator edge node is configured to process the PON physical layer signal in the data to obtain a PON MAC frame, and process the PON MAC frame to obtain an xPON MAC frame, where the PON MAC frame is located in the xPON MAC frame The xPON physical layer processing is performed on the xPON MAC frame to obtain an xPON physical layer signal, and the xPON physical layer signal is sent.

 9. A data transmission system, comprising:

a carrier edge node, configured to process an xPON physical layer signal in the received data to obtain an xPON MAC frame, and read data in a load of the xPON MAC frame, according to a frame header of the xPON MAC frame The data in the payload of the xPON MAC frame is processed to obtain a PON MAC frame, and the PON MAC frame is processed by the P0N physical layer. Transmitting to the PON physical layer signal, and transmitting the PON physical layer signal;

 a user edge node, configured to receive a P0N physical layer signal sent by the operator edge node.

 10. An operator edge node, characterized by comprising:

 a P0N physical layer processing unit, configured to process a P0N physical layer signal to obtain a PON MAC frame; a framing processing unit, configured to process the PON MAC frame to obtain an xPON MAC frame, where the PON MAC frame is located in the xPON MAC The load of the frame;

 The xPON physical layer processing unit is configured to perform an xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and send the xPON physical layer signal.

 The operator edge node according to claim 10, wherein the operator edge node further includes:

 a multiplexing unit, configured to segment or reassemble the PON MAC frame according to a relationship between a length of a PON MAC frame obtained by the P0N physical layer processing unit and a preset length threshold, and the segmentation or recombination The PON MAC frame is sent to the framing processing unit for processing.

 12. An operator edge node, comprising:

 An xPON physical layer processing unit, configured to process an xPON physical layer signal to obtain an xPON MAC frame; a framing processing unit, configured to read data in a load of the xPON MAC frame, according to a frame header of the xPON MAC frame Processing the data in the payload of the xPON MAC frame to obtain a PON MAC frame;

 The P0N physical layer processing unit is configured to perform P0N physical layer processing on the PON MAC frame to obtain a P0N physical layer signal, and send the P0N physical layer signal.

 The operator edge node according to claim 12, wherein the operator edge node further includes:

 a demultiplexing unit, configured to segment or reassemble data in a load of the xPON MAC frame obtained by the second xPON physical layer processing unit, and send the segmented or reassembled data to the framing processing unit deal with.

 14. A data transmission method, comprising:

 Processing the service layer data to obtain a passive optical network P0N media access control MAC frame;

 Processing the PON MAC frame to obtain a next-generation passive optical network xPON medium access control MAC frame, where the PON MAC frame is located in a load of the xPON MAC frame;

 Performing an xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and transmitting the xPON physical layer signal.

 15. A data transmission method, comprising:

Processing the received xPON physical layer signal to obtain an xPON MAC frame; Reading data in a load of the xPON MAC frame;

 Processing, according to a frame header of the xPON MAC frame, data in a payload of the xPON MAC frame to obtain a P0N MAC frame;

 Processing the PON MAC frame to obtain service layer data and transmitting the service layer data.

 16. An operator edge node, comprising:

 At least one PON MAC layer processing unit, configured to process the service layer data to obtain a PON MAC frame; the first xPON MAC layer processing unit, configured to process the PON MAC frame to obtain an xPON MAC frame, where the PON MAC frame is located The load of the xPON MAC frame;

 The xPON physical layer processing unit is configured to perform an xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and send the xPON physical layer signal.

 The operator edge node according to claim 16, wherein the operator edge node further includes a second xPON MAC layer processing unit, where the xPON physical layer processing unit is further configured to receive the received xPON physical layer. The signal is processed to obtain an xPON MAC frame;

 The second xPON MAC layer processing unit is configured to read data in a load of the xPON MAC frame, process data in a load of the xPON MAC frame according to a frame header of the xPON MAC frame, and obtain a PON MAC. frame.

 The carrier edge node according to claim 17, wherein the PON MAC layer processing unit is further configured to process the PON MAC frame obtained by the second xPON MAC layer processing unit to obtain service layer data. And transmitting the business layer data.