WO2021180007A1 - 一种业务承载的方法、装置和系统 - Google Patents
一种业务承载的方法、装置和系统 Download PDFInfo
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- WO2021180007A1 WO2021180007A1 PCT/CN2021/079349 CN2021079349W WO2021180007A1 WO 2021180007 A1 WO2021180007 A1 WO 2021180007A1 CN 2021079349 W CN2021079349 W CN 2021079349W WO 2021180007 A1 WO2021180007 A1 WO 2021180007A1
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- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
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- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
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- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
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Definitions
- This application relates to the field of optical communication technology, and in particular to the technology of carrying low-rate service data.
- the optical transport network includes multiple-rate optical bearer containers for carrying multiple high-rate service data.
- optical transport unit 1 is the line interface container with the smallest rate of the current OTN technology, and its rate is about 2.5 Gigabit per second (Gbps), which can be used to carry two 1Gbps. Ethernet business data.
- FIG. 1 shows a schematic diagram of a mapping multiplexing path for low-speed services in the prior art.
- FE When 100M (100M) Ethernet (Fast Ethernet, FE) needs to be transmitted by OTN, FE is first mapped to an optical data unit (Optical Data Unit 0, ODU0) frame with a rate of about 1.25Gbps. Then transmit on OTN through OTU1. The transmission efficiency is low, and the bandwidth of ODU0 occupies less than 10%.
- Figure 1 also shows the mapping of the E1 signal (rate of 2048kbps). Specifically, multiple E1 signals are first mapped to a synchronous transmission module (sychronous trasnport module, STM)-1 interface signal. Among them, STM-1 is a kind of SDH signal. The STM-1 interface signal is then mapped to ODU0, and then transmitted on OTN through OTU1.
- STM synchronous transmission module
- the problem with the current processing method is that the low-speed signal needs to be multiplexed multiple times to form a high-speed signal, and then OTN technology is used to carry the signal.
- the processing process is complicated and the efficiency is low.
- both the sending device and the receiving device need to perform multi-level frame processing, the signal processing delay is relatively large.
- the present invention provides a service bearing method, device and system to solve the existing problems of low efficiency and high processing delay caused by the complicated processing process.
- an embodiment of the present application provides a service bearing method.
- the method includes: first, a device receives service data; then, the device maps the service data to one or more optical transport network (OTN) service transmission frames, and the rate of the one or more OTN service transmission frames is approximately 1.25 Gigabits per second (Gbps) or 10.3125Gbps; finally, the device uses an X Gigabit Ethernet transmission module to send the one or more OTN service transmission frames, the rate of the X Gigabit Ethernet transmission module and the one Or match the rate of multiple OTN service transmission frames, where X is equal to 1 or 10.
- OTN optical transport network
- a rate of approximately 1.25 gigabits per second (Gbps) or 10.3125 Gbps means that the rate is allowed to fluctuate within a certain range. For example, it floats within ⁇ 100ppm of 12.5Gbps, where ppm is one part per million.
- the embodiments of the present application can reduce the complexity of service bearers and can reduce equipment costs.
- the device mapping the service data to one or more OTN service transmission frames specifically includes: the device mapping the service data to multiple optical service unit (OSU) frames Wherein, each of the multiple OSU frames is an integer multiple of 16-byte blocks, the OSU frame includes an overhead area and a payload area, the payload area is used to carry the service data, and the overhead area is used In order to carry frame overhead; then, the device performs adaptation processing on the multiple OSU frames that carry the service data to obtain the multiple OTN service transmission frames.
- OSU optical service unit
- the adaptation process mentioned in the foregoing implementation manner may include any of the following: adding delimitation information to each of the multiple OSU frames; or adding delimitation information to each of the multiple OSU frames And encoding; or, adding delimitation information, encoding, and performing compression for each of the multiple OSU frames, where the performing compression includes deleting padding information in the multiple OSU frames, and the encoding is 8B/ 10B encoding or 64B/66B encoding.
- the execution of the compression operation can further reduce the delay introduced by the service processing.
- adding delimitation information may specifically include: adding a frame start identifier and a frame end identifier to each of the multiple OSU frames; or, inserting the delimitation information before each frame of the multiple OSU frames .
- the device mapping the service data to one or more OTN service transmission frames specifically includes: the device mapping the service data to multiple optical service units (OSU) In the frame, each of the multiple OSU frames is an integer multiple of 16-byte blocks, the OSU frame includes an overhead area and a payload area, the payload area is used to carry the service data, and the overhead area Used to carry frame overhead; then, the device maps the multiple OSU frames carrying the service data into an optical data unit (ODU) frame to obtain the OTN service transmission frame.
- OSU optical service units
- the ODU frame has a 4-row 3824-byte column structure, and only includes frame header indication, multi-frame indication, link monitoring overhead, payload type, and payload area; wherein, the frame header indication is used to indicate the optical data The start position of the unit frame, the multi-frame indication is used to indicate the position of the optical data unit frame in a group of continuous optical data unit frames, the link monitoring overhead is used for link monitoring, and the payload type is used for In order to indicate the mapping mode of the service carried by the optical data unit frame, the payload area is used to carry the multiple OSU frames.
- the ODU frame is an integer multiple of 64 with a 5140 bit column structure, including an alignment overhead and a payload area, where the alignment overhead is used to indicate the start position of the optical data unit frame, and the payload area is used for Carrying the multiple OSU frames.
- the optical data unit frame of the latter example carries less overhead, which can improve the bandwidth utilization of the data frame.
- the ODU frame may be the OTN service transmission frame.
- the mapping the multiple OSU frames carrying the service data into one ODU frame to obtain the OTN service transmission frame specifically includes: mapping the multiple OSU frames into one ODU frame ; Perform one or more of the following operations on the ODU frame to obtain the OTN service transmission frame: adding FEC information, adding delimitation information and encoding processing, the encoding processing is 8B/10B encoding processing or 64B/66B Encoding processing.
- an embodiment of the present application provides a service processing device.
- the device includes a memory and a processor, the memory is used to store a computer program, and the processor is used to execute the following methods:
- Receiving service data mapping the service data to one or more optical transport network (OTN) service transmission frames, and the rate of the one or more OTN service transmission frames is 1.25 gigabits per second (Gbps) or 10.3125 Gbps;
- the OTN service transmission frame is sent to an X Gigabit Ethernet transmission module, and the rate of the X Gigabit Ethernet transmission module matches the rate of the one or more OTN service transmission frames, where X is equal to 1 or 10 .
- the service processing apparatus may specifically be a chip or a chipset composed of multiple chips.
- an embodiment of the present application provides a device.
- the device includes the service processing device and the X Gigabit Ethernet transmission module as described in the second aspect or any specific implementation manner thereof.
- the device can be a client device, and the client device sends its business data to the OTN network through an X Gigabit Ethernet transmission module to achieve transmission.
- the embodiments of the present application provide a method for obtaining services.
- the method includes: the device receives one or more optical transport network (OTN) service transmission frames with an X Gigabit Ethernet transmission module, and the rate of the one or more OTN service transmission frames is 1.25 Gigabits per second (Gbps) Or 10.3125 Gbp, the rate of the X Gigabit Ethernet transmission module matches the rate of the one or more OTN service transmission frames, where X is equal to 1 or 10; the device receives data from the one or more OTN services The transmission frame parses out the business data.
- OTN optical transport network
- the parsing of the service data from the one or more OTN service transmission frames specifically includes: deleting and delimiting information processing on the one or more OTN service transmission frames, or decoding And delete delimitation information processing to obtain a plurality of OSU frames, each of the plurality of OSU frames is an integer multiple of 16-byte blocks, the OSU frame includes an overhead area and a payload area, the payload area is used To carry the service data, the overhead area is used to carry frame overhead; the service data is demapped from the multiple OSU frames.
- the one or more OTN service transmission frames are optical data unit (ODU) frames
- the optical data unit frame is any one of the following two structures:
- the first structure 4-row 3824-byte column structure, including only frame header indication, multi-frame indication, link monitoring overhead, payload type, and payload area; wherein the frame header indication is used to indicate the ODU frame
- the multi-frame indication is used to indicate the position of the ODU frame in a group of consecutive ODU frames
- the link monitoring overhead is used to perform link monitoring
- the payload type is used to indicate the ODU frame
- the mapping method of the bearer service, the payload area is used to carry multiple OSU frames
- the second structure an integer multiple of 64 row 5140 bit column structure, including alignment overhead and a payload area, wherein the alignment overhead Used to indicate the starting position of the ODU frame, and the payload area is used to carry the multiple OSU frames;
- the parsing of the service data from the one or more OTN service transmission frames specifically includes:
- parsing the service data from the one or more OTN service transmission frames specifically includes: performing FEC decoding on the one or more OTN service transmission frames to obtain optical data unit (ODU) frames, so The optical data unit frame is used to carry multiple OSU frames; the multiple OSU frames are demapped from the optical data unit frame; the service data is demapped from the multiple OSU frames.
- ODU optical data unit
- the specific ODU frame can be any one of the foregoing two structures, which will not be repeated here.
- the method of the first aspect is a sending method
- the method of the present invention is a corresponding receiving-side method. Therefore, unless otherwise specified, some steps of the specific implementation on the sending side can also be inversely processed on the receiving side. For example, if an 8B/10B encoding operation is performed on the transmitting side, then an 8B/10B decoding operation is performed on the receiving side correspondingly.
- delimitation information is added on the sending side, the delimitation information needs to be identified at the receiving end to determine the start position of the relevant data frame, and then the corresponding delimitation information is deleted to obtain the data frame. In particular, if the sending side compresses the data frame by deleting the padding information, the receiving end may not need to add the padding information back to the data frame.
- an embodiment of the present application provides a service processing device.
- the device includes a memory and a processor, the memory is used to store a computer program, and the processor is used to execute the following methods:
- OTN optical transport network
- the service processing apparatus may specifically be a chip or a chipset composed of multiple chips.
- an embodiment of the present application provides a device.
- the equipment includes the service processing device of the fourth aspect of the claim or any specific implementation manner thereof and an X Gigabit Ethernet transmission module.
- an embodiment of the present application provides a system.
- the system includes the device according to any one of the specific implementations of the third aspect and the device according to any one of the specific implementations of the fifth aspect, wherein the former device sends an OTN service transmission frame to the latter equipment.
- the OSU frame is used as the OTN service transmission frame.
- the previous device was a client device and the latter device was an OTN device connected to the client device.
- the OTN device does not need to parse out business data and can use OSU frames as processing objects for cross-processing, which simplifies the end-to-end business processing flow.
- Figure 1 is a schematic diagram of a low-speed service processing flow in the prior art
- Figure 2 is a schematic diagram of application scenarios applicable to this application.
- Figure 3 is a schematic structural diagram of an optical transmission device
- Figure 4a is a schematic flow chart of a method for service bearer provided by this application.
- FIG. 4b is a schematic diagram of the mapping hierarchy of service data corresponding to the embodiment shown in FIG. 4a;
- FIG. 5 is a schematic flowchart of the first service bearing method provided by an embodiment of this application.
- FIG. 6 is a schematic structural diagram of an optical service unit frame in the embodiment shown in FIG. 5;
- FIG. 7a is a schematic structural diagram of a data frame containing delimitation information in the embodiment shown in FIG. 5;
- FIG. 7b is a schematic diagram of another data frame containing delimitation information in the embodiment shown in FIG. 5;
- FIG. 8 is a schematic diagram of a compressed data frame in the embodiment shown in FIG. 5;
- FIG. 9 is a schematic flowchart of a second service bearing method provided by an embodiment of this application.
- FIG. 10a is a schematic diagram of an optical data unit frame containing delimitation information in the embodiment shown in FIG. 9;
- FIG. 10b is a schematic diagram of another optical data unit frame containing FEC information in the embodiment shown in FIG. 9;
- FIG. 11a is a schematic diagram of an OTN service transmission frame in the embodiment shown in FIG. 9;
- FIG. 11b is a schematic diagram of another OTN service transmission frame in the embodiment shown in FIG. 9;
- FIG. 12 is a schematic flowchart of a third service bearing method provided by an embodiment of the present application.
- FIG. 13 is a schematic structural diagram of a service processing chip provided by an embodiment of this application.
- FIG. 14 is a schematic structural diagram of an Ethernet optical module provided by an embodiment of the application.
- FIG. 15 is a schematic structural diagram of a user equipment provided by an embodiment of this application.
- the device forms and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention.
- a person of ordinary skill in the art knows that with the evolution of device forms and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.
- FIG. 2 shows a schematic diagram of application scenarios applicable to this application.
- this application scenario includes an Optical Transport Network (OTN) and multiple user equipment (user equipment 1-6 as shown in Figure 2).
- OTN includes multiple interconnected OTN devices (such as OTN devices 1-4 as shown in FIG. 2).
- Figure 2 only shows the OTN equipment used to connect to client equipment. In practical applications, OTN may also include more equipment.
- Figure 2 does not show the specific connection relationship of the OTN equipment.
- the OTN devices in the OTN network are connected by optical fibers, and can be formed into different topological types such as linear, ring, and mesh according to specific needs.
- CPE Customer Premise Equipment
- OTN equipment may have different functions.
- OTN equipment is divided into optical layer equipment, electrical layer equipment, and photoelectric hybrid equipment.
- Optical layer equipment refers to equipment capable of processing optical layer signals, such as optical amplifier (optical amplifier, OA), optical add-drop multiplexer (optical add-drop multiplexer, OADM).
- OA may also be called an optical line amplifier (OLA), which is mainly used to amplify optical signals to support longer distances under the premise of ensuring the specific performance of optical signals.
- OVA optical line amplifier
- OADM is used to spatially transform the optical signal so that it can be output from different output ports (sometimes called directions).
- OADM can be divided into fixed OADM (fixed OADM, FOADM), configurable OADM (reconfigurable OADM, ROADM), etc.
- Electrical layer equipment refers to equipment capable of processing electrical layer signals, for example: equipment capable of processing OTN electrical signals.
- Optoelectronic hybrid equipment refers to equipment capable of processing optical layer signals and electrical layer signals. It should be noted that, according to specific integration needs, an OTN device can integrate multiple different functions. The technical solution provided in this application is suitable for OTN equipment of different forms and integration levels, and is especially suitable for OTN equipment used to connect to client equipment.
- FIG 3 is a schematic diagram of the structure of an optical transmission device.
- an OTN device 300 includes a power supply 301, a fan 302, an auxiliary board 303, and may also include a tributary board 304, a circuit board 306, a crossover board 305, an optical layer processing board (not shown in the figure), and System control and communication board 307.
- a network device serving as a core node may not have a tributary board 304.
- a network device as an edge node may have multiple tributary boards 304.
- the power supply 301 is used to supply power to the OTN device 300, and may include a main power supply and a backup power supply.
- the fan 302 is used to dissipate heat for the device.
- the auxiliary single board 303 is used to provide auxiliary functions such as external alarms or access to external clocks.
- the tributary board 304, the cross board 305, and the circuit board 306 are mainly used to process the electrical layer signals of the OTN.
- the tributary board 304 is used to implement the reception and transmission of various customer services, such as SDH services, packet services, Ethernet services, and fronthaul services. Furthermore, the tributary board 304 can be divided into a client-side optical module and a signal processor. Among them, the client-side optical module may be an optical transceiver for receiving and/or sending service data. The signal processor is used to implement the mapping and de-mapping processing of the service data to the data frame. The cross board 305 is used to implement the exchange of data frames and complete the exchange of one or more types of data frames. The circuit board 306 mainly implements the processing of the data frame on the line side.
- the circuit board 306 can be divided into a line-side optical module and a signal processor.
- the line-side optical module may be a line-side optical transceiver for receiving and/or sending data frames.
- the signal processor is used to implement multiplexing and demultiplexing, or mapping and demapping processing of data frames on the line side.
- the system control and communication single board 307 is used to implement system control and communication. Specifically, information can be collected from different boards through the backplane, or control instructions can be sent to the corresponding boards.
- there may be one or more specific components for example: signal processor
- the embodiments of the present application do not impose any restrictions on the types of boards included in the device and the functional design and number of boards.
- High rate refers to a transmission rate of at least 2.5Gbps.
- the problem with this is that the processing flow is complicated, the bandwidth utilization is low, and there is also the problem of large processing delay.
- a more straightforward way is to introduce a lower rate data frame into the OTN, for example, to introduce a rate-matched low rate data frame for the E1 signal. Multiple low-rate data frames are then mapped to ODU0 or other existing ODU containers for transmission. This can simplify the process to a certain extent and improve bandwidth utilization, but there are two problems.
- the first problem is that OTU1 with a line interface rate of 2.5Gbps still supported by OTN requires multiple lower rate data frames to be processed together, and there is still a large processing delay. Another problem is that supporting more data frame processing levels will greatly increase the cost of OTN equipment.
- this application provides a new service bearing method to reduce the complexity of service processing and at the same time reduce the cost of OTN equipment.
- the method provided in this application newly defines the interface data frame that can be used for the client device interface and the OTN device to connect to the client device interface, which can effectively reduce the equipment cost.
- the value of the data frame rate mentioned in this application can be changed within a certain range. Therefore, if the rate of a data frame is a value that varies within a predetermined range on a fixed rate, it can be simply described as the rate of the data frame as the fixed rate. For example, if the rate of a data frame is (1.25Gbps (1-100ppm), 1.25Gbps (1+100ppm)), it can be described as the rate of the data frame is 1.25Gbps. (1.25Gbps(1-100ppm), 1.25Gbps(1+100ppm)) can also be simply written as 1.25Gbps ⁇ 100ppm. Among them, ppm is part per million.
- the rate of the data frame mentioned in this application refers to the bit rate of the data frame.
- the bandwidth value provided by the transmission channel corresponding to the data frame is equal to the bit rate value of the data frame. For example, if the data frame rate is 1.25Gbps, the bandwidth provided by the transmission channel corresponding to the data frame is 1.25G.
- the data frame may specifically be an OTN service transmission frame, an optical service unit frame, or an optical data unit frame, or a frame output after processing based on these frames.
- OTN service transmission frame an OTN service transmission frame
- optical service unit frame an optical data unit frame
- a frame output after processing based on these frames please refer to the description of the subsequent embodiments, which will not be repeated here.
- Fig. 4a is a schematic flowchart of a service bearing method provided by this application. As shown in Figure 4a, the method includes the following three steps.
- the service data may be generated by the device itself or may be service data sent by other devices.
- the client device 1 shown in FIG. 2 generates business data.
- the OTN device 3 as shown in FIG. 2 receives the OTU1 frame sent by the OTN device 1 and contains the service data.
- S403 Map the service data to one or more OTN service transmission frames, where the rate of the one or more OTN service transmission frames is 1.25 gigabits per second (Gbps) or 10.3125 Gbps;
- the OTN service transmission frame is a newly defined data frame, which can also be called an optical service transmission frame.
- OTN service transmission frames There are many ways to implement OTN service transmission frames. For details, reference may be made to various specific examples given in the embodiments of FIG. 5 and FIG. 9, which will not be repeated here.
- S405 Use an X Gigabit Ethernet transmission module to send the one or more OTN service transmission frames, where the rate of the X Gigabit Ethernet transmission module matches the rate of the one or more OTN service transmission frames, wherein, X is equal to 1 or 10.
- the X Gigabit Ethernet transmission module is a GE transmission module.
- the GE transmission module may be a twisted pair or a GE optical transceiver module (the latter may also be referred to as an optical module for short).
- the X Gigabit Ethernet transmission module is a 10GE optical module.
- GE transmission modules and 10GE optical modules may be existing commercial modules. Alternatively, it may be a transmission module supporting the service bearing method of the present application as shown in FIG. 14.
- the Ethernet transmission module may also be referred to as an Ethernet physical interface.
- an Ethernet optical module is also called an Ethernet optical interface; a twisted pair cable can also be called an Ethernet electrical interface.
- rate matching means that the difference between the rate of the OTN service transmission frame and the rate of the X Gigabit Ethernet transmission module is within a predetermined range. For example, 100 ppm or a smaller range.
- Figure 4b shows a schematic diagram of the processing level of business data.
- the service data is first mapped to the OTN service transmission frame, and then the GE or 10GE transmission module is used for transmission.
- the technical solution disclosed in this application can simplify the complexity of service carrying and is less effective Equipment cost.
- first and second in this application are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in a sequence not described in this application.
- “And/or” is used to describe the association relationship of associated objects, indicating that there can be three types of relationships. For example, A and/or B can mean: A alone exists, A and B exist at the same time, and B exists alone.
- the specific operation method in the method embodiment can also be applied to the device embodiment. Conversely, the component function description in the device embodiment is also applicable to the related description in the method embodiment.
- the description of a certain technical feature in one embodiment can also be used to explain the corresponding technical features mentioned in other embodiments.
- the specific description of the Ethernet transmission module in one embodiment may be applicable to the Ethernet transmission module in other embodiments.
- the specific fields included in the delimitation information and the specific implementation manner of adding delimitation information can be applied to the steps of delimiting information and adding delimitation information mentioned in other embodiments.
- FIG. 5 is a schematic flow chart of the first service bearing method provided by an embodiment of this application.
- a client device is taken as an example for description.
- the method includes the following multiple steps.
- the client device 1 acquires data of low-speed services.
- low-speed SDH services such as Virtual Container (VC) 12, VC3 and VC4
- low-rate Plesiochronous Digital Hierarchy (PDH) services such as E1, E3, and E4, low-speed Ethernet services
- Industrial Internet of Things business and emerging business etc.
- Emerging services can include, for example, video, VR (Virtual Reality), AR (Augmented Reality), and so on.
- S503 Map the service data to multiple optical service unit (OSU) frames;
- Fig. 6 is a schematic diagram of the structure of an OSU frame.
- the OSU frame includes an overhead area and a payload area.
- the overhead area is used to carry overhead information, such as service identification and service data length (identified as payload length in FIG. 6) information carried by the payload area.
- the payload area is used to carry low-speed services.
- the size of an OSU frame is an integer multiple of 16 bytes (Byte, abbreviated as B).
- B 16 bytes
- the OSU frame length shown in Figure 6 is 128 bytes, that is, 16B*8.
- the amount of data corresponding to different low-speed services may be different.
- One service data may be carried in one OSU frame. Or, one service data needs to be split and mapped into multiple OSU frames.
- the OSU frame is also called an optical service data unit (optical service data unit, OSDU) frame.
- OSDU optical service data unit
- the payload area of the OSU frame may contain padding information.
- padding information can be filled in.
- the occupancy ratio or size of the payload area is preset, the part that cannot carry service data can be written with padding information.
- S505 Perform adaptation processing on the multiple OSU frames to obtain multiple OTN service transmission frames, where the rate of the multiple OTN service transmission frames is 1.25 or 10.3125 Gbps;
- the adaptation process is to add delimitation information.
- delimitation information There are many specific ways to add delimitation information, which will be explained separately below.
- Fig. 7a is a schematic diagram of the structure of a data frame containing delimitation information.
- the data frame shown in Figure 7a includes an OSU frame, a frame start identifier, and a frame end identifier.
- the frame start identifier and the frame end identifier may use the control codes K27.7 and K29.7 used in the 8B/10B coding mode, respectively.
- the frame start identifier and the frame end identifier may also use other characters.
- the start character and end character defined in the 64B/66B encoding can be used.
- other customized special characters can also be used to indicate the start or end of the OSU frame.
- Figure 7b is a schematic diagram of another data frame containing delimitation information.
- the data frame shown in Fig. 7b includes multiple OSU frames and delimitation information located before each OSU frame.
- the delimitation information is used to determine the start position of the OSU frame for data analysis.
- the delimitation information may include a frame length field and multiple error correction information (error correction information 1 and error correction information 2 as shown in FIG. 7b).
- the error correction information 1 is used to implement single-bit error correction for the frame length field, and may also be referred to as an error correction code (ECC).
- ECC error correction code
- the frame length field is used to indicate the frame length of the OSU frame.
- Error correction information 2 is used to implement error correction on the frame length field and error correction information 1.
- a cyclic redundancy check (cyclic redundancy check, CRC) can be used to achieve this.
- the length of the delimitation information can be 2 bytes or 3 bytes, etc. In the example shown in Figure 7b, if the length of the delimitation information is 2B, the frame length field occupies 1B, the error correction information 1 occupies 5 bits, and the error correction information 2 occupies 3 bits (that is, CRC3 is used). Specifically, the error correction information (error correction information 1 and/or error correction information 2) will change as the frame length changes. If the OSU frame does not change, the value of the error correction information will not change.
- the receiving end device can determine the start position of the OSU frame by identifying the frame length information with unchanged information and the matching error correction information from the received data stream. Similarly, if the frame length changes, correspondingly, the error correction information X will change regularly. In this way, the start position of the OSU frame in a data stream can also be identified through the frame length information and the matching error correction information. It should be noted that the error correction information 1 is optional. It is also possible to complete frame delimitation through a combination of error correction information and frame length information.
- the adaptation operation may also include an encoding operation.
- the encoding operation may be 8B/10B encoding, 64B/66B encoding or other encoding methods to improve the reliability of data transmission.
- the frame start identifier and the frame end identifier adopt K27.7 and K29.7 respectively, and the encoding method adopts 8B/10B encoding, the existing Ethernet physical layer processing module can be reused to reduce equipment costs.
- the adaptation operation may also include data compression.
- Data compression is aimed at scenarios where the payload area contains padding information.
- FIG. 8 is a schematic diagram of a compressed data frame in the embodiment shown in FIG. 5. As shown in FIG. 8, the length of the payload area of the OSU frame before compression is 120 bytes, and the length of the OSU frame after deleting padding (ie, data compression) is 80 bytes. Therefore, in a service data transmission, there may be situations in which both uncompressed OSU frames and compressed OSU frames exist (it can also be referred to as a hybrid transmission mode for short).
- the multiple OTN service transmission frames obtained through data compression only contain valid service data and necessary overhead, which improves network bandwidth utilization and reduces service processing delay.
- the adaptation operation may also include a scrambling operation to suppress the long-connection "0" and the long-connection "1" in the line code, so as to facilitate the extraction of the clock signal from the line signal.
- a scrambling operation to suppress the long-connection "0" and the long-connection "1" in the line code, so as to facilitate the extraction of the clock signal from the line signal.
- a self-synchronization scrambling code or a frame synchronization scrambling code can be used.
- the adaptation operation includes multiple specific actions, the order of these specific actions can be exchanged. For example, you can compress first, and then add delimitation information. Or, you can add delimitation information first and then compress it.
- the OTN service transmission frame may be an OSU frame that contains delimitation information, an OSU frame that contains delimitation information and is 8B/10B encoded, or an OSU frame that contains delimitation information and is compressed .
- the output OTN service transmission frame rate is 1.25 or 10.3125Gbps.
- the OTN service transmission frame may be called an enhanced OSU (enhanced OSU, OSUe) frame.
- the size of the service data rate that can be carried by the OTN service transmission frame is explained.
- the OSU frame adds a frame start identifier and a frame end identifier, adds 2 bytes, and then performs 8B/10B encoding to obtain an OTN service transmission frame.
- 120 is the size of the payload area; 80% is the percentage of valid data after 8B/10B encoding.
- the bandwidth that business data can occupy is 0.923G.
- the compression of OTN service transmission frames can also reduce the waiting time of other parallel service data.
- an interface with a bandwidth of 1.25G can carry up to 112 E1 services at the same time.
- S405 Use an X Gigabit Ethernet transmission module to send the multiple service transmission frames, where the rate of the X Gigabit Ethernet transmission module matches the rate of the multiple service transmission frames, where X is equal to 1 or 10.
- the service transmission frame needs to be coded with 8B/10B in order to use twisted pair for data transmission.
- the technical solution disclosed in this application can simplify the processing complexity of service bearers and reduce equipment cost.
- FIG. 9 is a schematic flowchart of a second service bearing method provided by an embodiment of this application.
- a client device is taken as an example for description. As shown in Figure 9, the method includes the following steps.
- S901 Map the service data to multiple optical service unit (OSU) frames;
- S901 is the same as step S503 in FIG. 5, and for the specific description of this step and the OSU frame, refer to the description of step S503 in FIG. 5, which will not be repeated here.
- S901 is an optional step. If S901 is not included in the method of this embodiment, the service data is directly mapped to the ODU frame in step S903.
- the advantage of introducing OSU frames is that OSU frames can better match the rate requirements of low-speed services, and OSU frame granular crossover operations can be introduced in OTN, which improves the flexibility of end-to-end service processing. For details, please refer to the embodiment of FIG. 12, which will not be repeated here.
- S905 Perform one or more of the following operations on the optical data unit frame: adding FEC information, adding delimitation information, and/or encoding processing to obtain an OTN service transmission frame, and the rate of the OTN service transmission frame is 1.25 Or 10.3125Gbps;
- Figure 10a shows a schematic diagram of an optical data unit frame containing delimitation information.
- the optical data unit frame has a structure of 4 rows and 3824 byte columns.
- the 1-16 columns of the optical data unit frame are overhead areas, including frame header indication, multi-frame indication, path monitoring overhead, and payload type overhead, and the other parts are reserved fields; 17-3824 columns are the payload area, used To carry multiple OSU frames.
- the frame header indication is used to indicate the start position of the optical data unit frame.
- the multi-frame indication is used to indicate which of the multiple consecutive optical data unit frames the current optical data unit frame belongs to.
- the path monitoring overhead is used to monitor the path quality, that is, to transmit the quality information of the path through which the optical data unit frame is transmitted.
- the path monitoring overhead may include one or more of the following information: Trail trace Identifier (TTI), 8-Bit Interleaved Parity (BIP8), and Backward Error Indication (Backward Error Indication).
- BEI Trail trace Identifier
- BEI backward defect indication
- BDI backward Defect Indication
- STAT status information
- the payload type (PT) overhead is used to indicate the mapping manner of the service carried by the optical data unit frame to the optical data unit frame.
- PT overhead can also be a business mapping type. Specifically, the PT can be preset to a certain value, such as 0x25, to indicate that the optical data unit frame is carried as an OSU frame.
- the reserved fields in columns 1-16 of the optical data unit frame can also be used to carry the OSU frame, so as to improve the bandwidth utilization of the optical service unit frame.
- the aforementioned optical data unit frame only includes the aforementioned overhead (as shown in FIG. 10a).
- FIG. 10a is only an example for specific overhead locations, and other arrangements can also be substituted. For example, place the aforementioned multiple overheads starting from the first row, occupying several consecutive columns, and the remaining positions are used as the payload area. Doing so can simplify data frame parsing.
- Figure 10a shows a specific example of adding delimitation information to the optical data unit frame.
- the delimitation information is added before the first byte and after the last byte of each row of the data frame; or, in the unit of the entire optical data unit frame, in the first byte of the frame Add delimitation information before or after the last byte.
- the delimitation information please refer to the introduction of FIG. 7a and FIG. 7b, which will not be repeated here.
- FIG. 10b is a schematic diagram of another optical data unit frame containing FEC information.
- a Forward Error Correction (FEC) area is added to the frame structure of the optical data unit, with a size of 4 rows and 256 byte columns (ie, the 3825-4080 columns shown in Figure 10b). ).
- the FEC area is used to correct bit errors that occur during the transmission of the optical data unit frame.
- the optical data unit frame may also include section monitoring (Section Monitoring, SM) overhead, and the SM is used for link monitoring.
- SM section monitoring
- the optical data unit frame can also be encoded to obtain the OTN service transmission frame.
- FEC information can also be inserted in other ways.
- 16 columns of FEC information can be inserted every 239 columns.
- 32 columns of FEC information can be inserted every 478 columns.
- the mapping of the OSU frame to the optical data unit frame described in FIG. 10a and FIG. 10b is only an example.
- the payload area of the optical data unit frame can be divided into multiple payload blocks. A number of consecutive payload blocks with a preset number are used as a transmission cycle.
- the OSU frame When the OSU frame is mapped to the data unit frame, it occupies part or all of the payload block of a transmission cycle.
- An OSU frame can be placed in one or more payload blocks. For comparison, this application is not limited.
- the OTN service transmission frame may be an optical data unit frame containing delimitation information, an optical data unit frame containing delimitation information and 8B/10B encoding, and an optical data unit frame containing delimitation information and FEC information. Data unit frame.
- the output OTN service transmission frame rate is 1.25 or 10.3125Gbps.
- ODU0u under-clocked optical data unit 0
- over-clocked optical data unit 0 over-clocked optical data
- unit 0, ODU0o enhanced optical data unit 0 frame
- Ethernet optical data unit frame if ODU0e contains FEC information, it can also be called optical transmission unit 0 frame (under-clocked optical transport unit 0, OTU0u), over-clocked optical transmission unit 0 frame (over-clocked optical transport unit 0, OTU0o), Enhanced optical transmission unit 0 frame (OTU0e) or Ethernet optical transmission unit frame.
- ODU0 is a transmission container defined by the existing OTN standard, and its rate is 1.24416Gbps. It cannot be used as an interface transmission container, that is, it needs to be mapped to a higher-order OTU frame (such as OTU1) before it can be transmitted between devices.
- ODU0e or OTU0e provided by this embodiment can be directly sent from one device to another device by using the Ethernet transmission module, so as to realize the transmission of service data at a lower equipment cost.
- ODU2u under-clocked optical data unit 2
- OTU2u over-clocked optical data unit 2
- OTU2o over-clocked optical transport unit 2
- ODU2 is a transmission container defined by the existing OTN standard, and its rate is 10.037273924Gbps. It needs to be mapped to OTU2 and OTU2 optical modules can be used for transmission between devices. However, the ODU2u provided in this embodiment can be directly sent from one device to another device by using the Ethernet transmission module to realize the transmission of service data.
- Figure 11a and Figure 11b show the structure diagrams of two other OTN service transmission frames.
- the difference between these two OTN service transmission frames is that the OTN service transmission frame shown in FIG. 11b includes the FEC area.
- the size of the FEC area may be 140 bit columns or 300 bit columns, and RS (528,514) or RS (544,514) FEC encoding methods are respectively adopted.
- the size of the same part in Fig. 11a and Fig. 11b is: 128 rows and 5140 bit columns, including alignment overhead, other overheads, and a payload area carrying multiple OSU frames.
- the other overhead can be one or more of the following information: TTI, BIP8, BEI, BDI, and STAT.
- the number of lines contained in the frame can also be an integer multiple of 64 such as 256 lines and 1024 lines. In this regard, this application is not limited.
- the frame structure shown in FIG. 11a and FIG. 11b has a small overhead ratio.
- a higher transmission rate of the payload area can be obtained, and the bandwidth utilization rate is improved.
- the OTN service transmission frame shown in FIG. 11a and FIG. 11b may also be added with delimitation information. Specifically, it can be added to other overheads, or delimitation information can be added as shown in Figure 10a.
- the OTN service transmission frames shown in FIG. 11a and FIG. 11b may also be encoded. If these optional operations are performed, the OTN service transmission frame in the next step refers to the data frame after these operations are performed.
- S405 Use an X Gigabit Ethernet transmission module to send the OTN service transmission frame, where the rate of the X Gigabit Ethernet transmission module matches the rate of the OTN service transmission frame, where X is equal to 1 or 10.
- the technical solution disclosed in this application can simplify the complexity of service carrying and effectively lower equipment costs.
- FIG. 12 is a schematic flowchart of a third service bearing method provided by an embodiment of this application.
- the business data needs to be transmitted from the client device 1 to the client device 4 via the OTN device 1 and the OTN device 3 as an example for description.
- the method includes the following multiple steps.
- Client device 1 executes:
- S1201 Map service data to multiple optical service unit (OSU) frames;
- S1203 Perform adaptation processing on the multiple OSU frames to obtain multiple OTN service transmission frames, where the rate of the multiple OTN service transmission frames is 1.25 Gbps;
- S1205 Send the multiple service transmission frames by using a GE optical sending module.
- step S503, step S505, and step S405 in FIG. 5 are similar to step S503, step S505, and step S405 in FIG. 5. Refer to the description of the corresponding steps in FIG. 5, which will not be repeated here.
- OTN equipment 1 executes:
- S1209 After interleaving the multiple OSU frames, map part of the data frames in the multiple OSU frames to OTN frames of 2.5 Gbps or above, and the destination device of the part of the data frames is the client device 4;
- S1211 Send the OTN frame
- the OTN device 1 parses the OTN service transmission frame to obtain the multiple OSU frames. Specifically, parsing may include processing such as deleting delimitation information, decoding, and/or adding padding information. Alternatively, if the actions of the client device 1 are replaced with multiple steps in FIG. 9, the analysis may specifically include performing FEC decoding, deleting delimitation information, decoding and/or demapping. It should be understood that the processing operation performed by the OTN device 1 is the reverse operation of the client device 1. Then, the OTN device 1 performs cross processing on the multiple OSU frames that are parsed, and maps part or all of the multiple OSU frames to high-rate line OTN frames (for example, 2.5G OTU1 frames).
- high-rate line OTN frames for example, 2.5G OTU1 frames.
- Interleave processing refers to dispatching data frames from one port to another output port. Which port is specifically scheduled can be determined according to the destination device to which the data frame needs to be sent.
- step S1209 take the destination device of some of the multiple OSU frames as the client device 4 as an example, these OSU frames will be crossed to the same port and sent to the next OTN device (for example, OTN device 3 in this example) .
- OTN equipment 3 executes:
- S1213 parse out the partial data frame from the OTN frame
- S1215 Perform adaptation processing on the part of the data frames to obtain multiple transmission frames of another OTN service, and the transmission frame rate of the another OTN service is 1.25 Gbps;
- S1217 Send the multiple transmission frames of another OTN service by using a GE optical transmission module.
- the OTN device 3 demaps the partial data frame from the OTN frame. Then, the OTN device 3 executes processing similar to steps S1203 and S1205 in this embodiment. For details, refer to related descriptions, which will not be repeated here.
- Client device 4 executes:
- S1221 Parse the partial data of the service data from the part or data frame, and the destination device of the partial data of the service data is the client device 4.
- the technical solution disclosed in this application can simplify the complexity of service carrying and effectively lower equipment costs.
- OTN devices no longer need to parse out the service data of multiple discovered devices with different destinations, and directly use OSU frames for processing.
- the solution disclosed in the embodiments of the present application improves the flexibility of end-to-end service processing.
- Fig. 4a, Fig. 9 and Fig. 12 are described from the perspective that the OTN service transmission frame is directly sent through the Ethernet transmission module. It should be understood that the OTN service transmission frame may also be the OSU frame in FIG. 4a and FIG. 9, an OSU frame that has undergone some adaptation processing, or an optical data unit frame. Correspondingly, the bit rate of the OTN service transmission frame may no longer be 1.25Gbps or 10.31.25Gbps. In some possible implementations, the bit rate of the OTN service transmission frame for which delimitation information is added, encoding, and/or compression, for example, is 1.25Gbps or 10.31.25Gbps.
- the OSU frame as an OTN service transmission frame as an example
- the OSU frame is also encoded with, for example, 10B/8B
- the Ethernet optical module is used for transmission.
- the bit rate of the 8B/10B-encoded OSU frame (that is, the 8B/10B-encoded OTN service transmission frame) is 1.25Gbps or 10.31.25Gbps.
- FIG. 13 is a schematic structural diagram of a service processing chip provided by an embodiment of this application.
- the chip 1300 includes a processor 1301 and a memory 1302 connected to the processing.
- the memory 1302 is used to store necessary program instructions and data executed by the processor.
- the processor 1301 is configured to implement method steps executed by a device in any one or more of the foregoing embodiments.
- the processor 1301 is configured to execute other method steps except step S405 in FIG. 4a, FIG. 5 or FIG. 9, and send the OTN service transmission frame to the X Gigabit Ethernet module.
- the processor 1301 is configured to execute any device described in FIG.
- the X Gigabit Ethernet module receives data frames.
- the processor 1301 may be used to implement the method steps of two user equipments in FIG. 12, or used to implement the method steps of two OTN equipments, so as to support the function of sending and receiving services at the same time.
- the memory 1302 may not be included in the chip 1300, but is connected to the processor 1301 through a circuit.
- FIG. 13 is a single chip implementation.
- a chipset manner may also be used.
- two chips are used to complete the function of one chip shown in FIG. 13. Taking the embodiment shown in FIG. 5 as an example, one chip completes steps S501 and S503, and the other chip completes S505 and sends OTN service transmission frames to the X Gigabit Ethernet transmission module.
- the specific functional division of multiple chips is not limited in this application.
- FIG. 14 is a schematic structural diagram of an Ethernet optical module provided by an embodiment of the application.
- the Ethernet optical module 1500 includes a chip 1300, a modulator 1501, a light source 1502, and an optical interface 1503 shown in FIG. Both the chip 1300 and the light source 1502 are connected to the modulator 1501.
- the modulator 1501 is used to modulate the data signal output by the chip 1300 to the continuous light source output by the light source 1502, and then send it out through the optical interface 1503.
- the Ethernet optical module 1500 can be plugged into the corresponding interface on the user equipment or OTN equipment shown in FIG. 1 through the optical interface 1503 to complete related service transmission.
- FIG. 15 is a schematic structural diagram of a user equipment provided by an embodiment of this application.
- the user equipment 1600 provides two types of hardware structures to implement the low-speed service bearer mentioned in the method embodiment of the present application.
- One way is to connect the service processor 1601 through the Ethernet optical module 1500 shown in FIG. 14.
- the service processor 1601 is used to complete the processing that needs to be completed before the service data is transmitted to the Ethernet optical module 1500.
- other processing such as generating the business data or verifying the business data.
- the other is to provide a single board that implements service bearing, and the single board includes the chip 1300 shown in FIG. 13.
- the embodiment of the present application also provides an OTN device.
- the hardware structure of the OTN device in this embodiment is shown in FIG. 4a; wherein, the tributary board includes the chip 1300 shown in FIG. 13; or the tributary board includes the Ethernet optical module 1500 shown in FIG.
- the processor in the embodiment of the application may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware
- the components can implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application.
- the general-purpose processor may be a microprocessor or any conventional processor or the like.
- the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software units in the processor.
- the program code executed by the processor for implementing the foregoing method may be stored in a memory (for example, the memory 1302).
- the memory may be a non-volatile memory, such as a hard disk drive (HDD), etc., or a volatile memory (volatile memory), such as a random-access memory (RAM).
- the memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this.
- the embodiments of the present application also provide a computer-readable storage medium.
- the storage medium stores a software program, and when the software program is read and executed by one or more processors, the method provided by any one or more of the foregoing embodiments can be implemented.
- the computer-readable storage medium may include: U disk, mobile hard disk, read-only memory, random access memory, magnetic disk or optical disk and other media that can store program codes.
- this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
- computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
- These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
- the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
- These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
- the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
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Abstract
本发明提供了一种低速率业务的承载方法、装置和系统。一种可能的业务承载的方法包括:设备接收低速率的业务数据。然后,设备映射所述业务数据到一个或多个光传送网(OTN)业务传输帧中,所述一个或多个OTN业务传输帧的速率为1.25吉比特每秒(Gbps)或10.3125Gbps。最后,设备用GE或10GE传输模块发送所述一个或多个OTN业务传输帧,所述传输模块的速率和所述一个或多个OTN业务传输帧的速率匹配。例如,设备可用光业务单元帧来承载低速率业务,然后对光业务单元帧进行如添加定界信息或编码等处理来获取所述OTN业务传输帧。通过新定义数据帧以通过以太网传输模块来实现业务承载,本申请提供的业务承载技术可降低业务承载的复杂度,以降低处理时延和设备的成本。
Description
本申请要求于2020年3月11日提交中国国家知识产权局、申请号为202010167818.8、发明名称为“一种业务承载的方法、装置和系统”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请涉及光通信技术领域,尤其涉及低速率业务数据的承载技术。
光传送网(optical transport network,OTN)作为骨干承载网络的核心技术,包括多种速率的光承载容器,用于承载多种高速率的业务数据。例如,光传输单元1(optical transport unit 1,OTU1)为当前OTN技术的速率最小的线路接口容器,其速率约为2.5吉比特每秒(Gigabit per second,Gbps),可以用于承载两个1Gbps以太网业务数据。
随着同步数字体系(synchronous digita hierachy,SDH)技术逐步退出市场和OTN技术的发展,OTN技术的使用范围从骨干网扩展到城域网络,甚至接入网络中。因此,OTN技术需要面临越来越多的低速业务承载需求。当前低速业务的速率通常在2兆到几百兆比特每秒。当前的处理方法是:通过将低速信号复用为较高速率的信号后,再通过当前已有的光承载容器来承载。图1给出了现有技术中低速业务的映射复用路径示意图。如图1所示,当百兆(100M)以太网(Fast Ethernet,FE)需要采用OTN传输时,FE首先映射到速率约为1.25Gbps的光数据单元(Optical Data Unit 0,ODU0)帧中,然后再通过OTU1在OTN进行传输。这么做的传输效率较低,ODU0的带宽占用不到10%。图1还给出了E1信号(速率为2048kbps)的映射示意。具体地,多个E1信号首先映射到同步传输模块(sychronous trasnport module,STM)-1接口信号。其中,STM-1是SDH信号的一种。STM-1接口信号再映射到ODU0,然后再通过OTU1在OTN进行传输。
当前处理方法的问题在于,低速信号需要通过多次的复用后,形成高速率信号,再使用OTN技术进行承载,处理过程复杂,效率低。此外,因发送设备和接收设备都需要进行多层次的帧处理,信号处理时延也比较大。
发明内容
本发明提供了一种业务承载的方法、装置和系统,用以解决现有存在的处理过程复杂引起的效率低和处理时延高的问题。
第一方面,本申请实施例提供了一种业务承载的方法。所述方法包括:首先,设备接收业务数据;然后,设备映射所述业务数据到一个或多个光传送网(OTN)业务传输帧中,所述一个或多个OTN业务传输帧的速率约为1.25吉比特每秒(Gbps)或10.3125Gbps;最后,设备用X吉比特以太网传输模块发送所述一个或多个OTN业务传输帧,所述X吉比特以太网传输模块的速率和所述一个或多个OTN业务传输帧的速率匹配,其中,X等于1或10。
应理解,速率约为1.25吉比特每秒(Gbps)或10.3125Gbps指的是允许速率在一定范围内浮动。例如,在12.5Gbps的±100ppm内浮动,其中,ppm为百万分之一。
通过定义一个新的OTN帧和以太网传输模块配合使用,本申请实施例可以降低业务承载的复杂度,并且可以降低设备成本。
在一种可能的实现方式中,所述设备映射所述业务数据到一个或多个OTN业务传输帧中,具体包括:所述设备将所述业务数据映射到多个光业务单元(OSU)帧中,所述多个OSU帧的每一个为整数倍的16字节块,所述OSU帧包括开销区和净荷区,所述净荷区用于承载所述业务数据,所述开销区用于携带帧开销;然后,所述设备将承载了所述业务数据的所述多个OSU帧进行适配处理,以获得所述多个OTN业务传输帧。
例如,上述实现方式中提及的适配处理可以包括一下任意一种:为所述多个OSU帧的每一个添加定界信息;或者,为所述多个OSU帧的每一个添加定界信息和进行编码;或者,为所述多个OSU帧的每一个添加定界信息、进行编码和执行压缩,所述执行压缩包括删除所述多个OSU帧中的填充信息,所述编码为8B/10B编码或64B/66B编码。其中,执行压缩操作可以进一步降低业务处理引入的时延。
例如,上述添加定界信息具体可以包括:为所述多个OSU帧的每一个添加帧开始标识和帧结束标识;或,在所述多个OSU帧的每一个帧之前插入所述定界信息。
在另一种可能的实现方式中,所述设备映射所述业务数据到一个或多个OTN业务传输帧中,具体包括:所述设备将所述业务数据映射到多个光业务单元(OSU)帧中,所述多个OSU帧的每一个为整数倍的16字节块,所述OSU帧包括开销区和净荷区,所述净荷区用于承载所述业务数据,所述开销区用于携带帧开销;然后,所述设备将承载了所述业务数据的所述多个OSU帧映射到一个光数据单元(ODU)帧中,以获得所述OTN业务传输帧。
例如,ODU帧为4行3824字节列结构,仅包括帧头指示、复帧指示、链路监控开销、净荷类型和净荷区;其中,所述帧头指示用于指示所述光数据单元帧的开始位置,所述复帧指示用于指示所述光数据单元帧在一组连续光数据单元帧的位置,所述链路监控开销用于进行链路监控,所述净荷类型用于指示所述光数据单元帧承载业务的映射方式,所述净荷区用于承载所述多个OSU帧。又如,ODU帧为64的整数倍行5140比特列结构,包括对齐开销和净荷区,其中,所述对齐开销用于指示所述光数据单元帧的开始位置,所述净荷区用于承载所述多个OSU帧。后一个示例的光数据单元帧携带的开销较小,可以提高数据帧的带宽利用率。
在上述另一种实现方式中,所述ODU帧可能为所述OTN业务传输帧。或者,所述将承载了所述业务数据的所述多个OSU帧映射到一个ODU帧中,以获得所述OTN业务传输帧,具体包括:将所述多个OSU帧映射到一个ODU帧中;对所述ODU帧执行如下操作的一个或者多个,以获得所述OTN业务传输帧:添加FEC信息、添加定界信息和编码处理,所述编码处理为8B/10B编码处理或64B/66B编码处理。
需要说明的是,X=1时,所述X吉比特以太网模块发送所述OTN业务传输帧,具体包括:用双绞线或1GE光模块发送所述OTN业务传输帧;X=10时,所述X吉比特以太网模块发送所述OTN业务传输帧,具体包括:用10GE光模块发送所述OTN业务传输帧。
第二方面,本申请实施例提供一种业务处理装置。该装置包括存储器和处理器,所述存储器用于存储计算机程序,所述处理器用于执行如下方法:
接收业务数据;映射所述业务数据到一个或多个光传送网(OTN)业务传输帧中,所述一个或多个OTN业务传输帧的速率为1.25吉比特每秒(Gbps)或10.3125Gbps;将所述OTN业务传输帧发送给X吉比特以太网传输模块,所述X吉比特以太网传输模块的速率和所述一 个或多个OTN业务传输帧的速率匹配,其中,X等于1或10。
关于上述步骤中可能的具体实现方式,可以参考第一方面的具体实现方式描述,在此不再赘述。应理解,业务处理装置具体可以为一个芯片或者多个芯片构成的芯片组。
第三方面,本申请实施例提供一种设备。该设备包括如第二方面或者其任一具体实现方式所述的业务处理装置和所述X吉比特以太网传输模块。例如,该设备可以客户设备,该客户设备通过X吉比特以太网传输模块将其业务数据发送到OTN网络中,以实现传输。
第四方面,本申请实施例提供一种获取业务的方法。所述方法包括:设备用X吉比特以太网传输模块接收一个或多个光传送网(OTN)业务传输帧,所述一个或多个OTN业务传输帧的速率为1.25吉比特每秒(Gbps)或10.3125Gbp,所述X吉比特以太网传输模块的速率和所述一个或多个OTN业务传输帧的速率匹配,其中,X等于1或10;所述设备从所述一个或多个OTN业务传输帧解析出业务数据。
在一种可能的实现中,所述从所述一个或多个OTN业务传输帧解析出业务数据,具体包括:对所述一个或者多个OTN业务传输帧进行删除定界信息处理,或者解编码和删除定界信息处理,以获得多个OSU帧,所述多个OSU帧的每一个为整数倍的16字节块,所述OSU帧包括开销区和净荷区,所述净荷区用于承载所述业务数据,所述开销区用于携带帧开销;从所述多个OSU帧中解映射出所述业务数据。
例如,所述一个或者多个OTN业务传输帧为光数据单元(ODU)帧,所述光数据单元帧为下列两个结构的任意一个:
第一种结构:4行3824字节列结构,仅包括帧头指示、复帧指示、链路监控开销、净荷类型和净荷区;其中,所述帧头指示用于指示所述ODU帧的开始位置,所述复帧指示用于指示所述ODU帧在一组连续ODU帧的位置,所述链路监控开销用于进行链路监控,所述净荷类型用于指示所述ODU帧承载业务的映射方式,所述净荷区用于承载多个OSU帧;和,第二种结构:64的整数倍行5140比特列结构,包括对齐开销和净荷区,其中,所述对齐开销用于指示所述ODU帧的开始位置,所述净荷区用于承载所述多个OSU帧;
从所述一个或多个OTN业务传输帧解析出业务数据,具体包括:
从所述光数据单元帧中解映射出所述多个OSU帧;
从所述多个OSU帧中解映射出所述业务数据。
又如,所述从所述一个或多个OTN业务传输帧解析出业务数据,具体包括:对所述一个或者多个OTN业务传输帧进行FEC解码,以获得光数据单元(ODU)帧,所述光数据单元帧用于承载多个OSU帧;从所述光数据单元帧中解映射出所述多个OSU帧;从所述多个OSU帧中解映射出所述业务数据。ODU帧的具体可以为前述两种结构的任意一个,在此不再赘述。
应理解,第一方面的方法为发送方法,而本发明的方法为对应的接收侧方法。因此,除非特殊说明,发送侧具体实现方式的一些步骤对应地也可以在接收侧进行逆处理。例如,在发送侧进行8B/10B编码操作,那么对应地在接收端进行8B/10B解码操作。又如,如果在发送侧增加了定界信息,那么在接收端需要识别出定界信息,以确定相关数据帧的开始位置,然后删除对应的定界信息,以获取数据帧。特殊地,发送侧如果采用删除填充信息的方式压缩数据帧,接收端可能无需将这些填充信息添加回数据帧中。
第四方面,本申请实施例提供一种业务处理装置。所述装置包括存储器和处理器,所述存储器用于存储计算机程序,所述处理器用于执行如下方法:
接收X吉比特以太网传输模块发送的一个或多个光传送网(OTN)业务传输帧,所述一 个或多个OTN业务传输帧的速率为1.25吉比特每秒(Gbps)或10.3125Gbp,所述X吉比特以太网传输模块的速率和所述一个或多个OTN业务传输帧的速率匹配,其中,X等于1或10;从所述一个或多个OTN业务传输帧解析出业务数据。
关于上述步骤中可能的具体实现方式,可以参考第三方面的具体实现方式描述,在此不再赘述。应理解,业务处理装置具体可以为一个芯片或者多个芯片构成的芯片组。
第五方面,本申请实施例提供一种设备。所述设备包括权利要求第四方面或者其任一具体实现方式的业务处理装置和X吉比特以太网传输模块。
第六方面,本申请实施例提供一种系统。所述系统包括如第三方面其任一具体实现方式的所述的设备和第五方面其任一具体实现方式的所述所述的设备,其中,前一设备发送OTN业务传输帧给后一设备。
在一种可能的实现方式中,利用OSU帧作为OTN业务传输帧。以前一设备为客户设备,后一设备为连接该客户设备的OTN设备为例,OTN设备无需解析出业务数据,可以采用OSU帧作为处理对象进行交叉处理,简化了端到端的业务处理流程。
图1为现有技术中低速业务处理流程的示意图;
图2为本申请适用的应用场景示意图;
图3为一种光传送设备的结构示意图;
图4a为本申请提供的一种业务承载的方法流程示意图;
图4b为图4a所示实施例所对应的业务数据的映射层次示意图;
图5为本申请实施例提供的第一种业务承载的方法流程示意图;
图6为图5所示实施例中一种光业务单元帧的结构示意图;
图7a为图5所示实施例中一种包含定界信息的数据帧的结构示意图;
图7b为图5所示实施例中另一种包含定界信息的数据帧的结构示意图;
图8为图5所示实施例中经过压缩的数据帧示意图;
图9为本申请实施例提供的第二种业务承载的方法流程示意图;
图10a为图9所示实施例中一种包含定界信息的光数据单元帧示意图;
图10b为图9所示实施例中另一种包含FEC信息的光数据单元帧示意图;
图11a为图9所示实施例中一种OTN业务传输帧的示意图;
图11b为图9所示实施例中另一种OTN业务传输帧的示意图;
图12位本申请实施例提供的第三种业务承载的方法流程示意图;
图13为本申请实施例提供的一种业务处理的芯片的结构示意图;
图14为本申请实施例提供的一种以太网光模块的结构示意图;
图15为本申请实施例提供的一种用户设备的结构示意图。
本申请实施例描述的设备形态以及业务场景是为了更加清楚地说明本发明实施例的技术方案,并不构成对本发明实施例提供的技术方案的限制。本领域普通技术人员可知,随着设备形态的演变和新业务场景的出现,本申请实施例提供的技术方案对于类似的技术问题同样适用。
图2给出了本申请适用的应用场景示意图。如图2所示,该应用场景包括光传送网络(Optical Transport Network,OTN)和多个用户设备(如图2所示的用户设备1-6)。其中,OTN包括多个互连的OTN设备(如图2所示的OTN设备1-4)。图2仅给出了用于连接客户设备的OTN设备。在实际应用中,OTN还可能包括更多的设备。此外,图2为未给出OTN设备具体的连接关系。应理解,OTN网络中的OTN设备通过光纤连接而成,可以根据具体需要组成如线型、环形和网状等不同的拓扑类型。
需要说明的是,用户设备也可以称为用户终端设备(Customer Premise Equipment,CPE)。
一个OTN设备可能具备不同的功能。一般地来说,OTN设备分为光层设备、电层设备以及光电混合设备。光层设备指的是能够处理光层信号的设备,例如:光放大器(optical amplifier,OA)、光分插复用器(optical add-drop multiplexer,OADM)。OA也可被称为光线路放大器(optical line amplifier,OLA),主要用于对光信号进行放大,以支持在保证光信号的特定性能的前提下传输更远的距离。OADM用于对光信号进行空间的变换,从而使其可以从不同的输出端口(有时也称为方向)输出。根据能力不同,OADM可以分为固定的OADM(fixed OADM,FOADM),可配置的OADM(reconfigurable OADM,ROADM)等。电层设备指的是能够处理电层信号的设备,例如:能够处理OTN电信号的设备。光电混合设备指的是具备处理光层信号和电层信号能力的设备。需要说明的是,根据具体的集成需要,一个OTN设备可以集合多种不同的功能。本申请提供的技术方案适用于不同形态和集成度的OTN设备,尤其适用于用于连接客户设备的OTN设备。
图3为一种光传送设备的结构示意图。例如,图2中的OTN设备1。具体地,一个OTN设备300包括电源301、风扇302、辅助类单板303,还可能包括支路板304、线路板306、交叉板305、光层处理单板(图中未示出),以及系统控制和通信类单板307。
需要说明的是,根据具体的需要,每个设备具体包含的单板类型和数量可能不相同。例如:作为核心节点的网络设备可能没有支路板304。作为边缘节点的网络设备可能有多个支路板304。其中,电源301用于为OTN设备300供电,可能包括主用和备用电源。风扇302用于为设备散热。辅助类单板303用于提供外部告警或接入外部时钟等辅助功能。支路板304、交叉板305和线路板306主要是用于处理OTN的电层信号。其中,支路板304用于实现各种客户业务的接收和发送,例如SDH业务、分组业务、以太网业务和前传业务等。更进一步地,支路板304可以划分为客户侧光模块和信号处理器。其中,客户侧光模块可以为光收发器,用于接收和/或发送业务数据。信号处理器用于实现对业务数据到数据帧的映射和解映射处理。交叉板305用于实现数据帧的交换,完成一种或多种类型的数据帧的交换。线路板306主要实现线路侧数据帧的处理。具体地,线路板306可以划分为线路侧光模块和信号处理器。其中,线路侧光模块可以为线路侧光收发器,用于接收和/或发送数据帧。信号处理器用于实现对线路侧的数据帧的复用和解复用,或者映射和解映射处理。系统控制和通信类单板307用于实现系统控制和通信。具体地,可以通过背板从不同的单板收集信息,或将控制指令发送到对应的单板上去。需要说明的是,除非特殊说明,具体的组件(例如:信号处理器)可以是一个或多个,本申请不做限制。还需要说明的是,本申请实施例不对设备包含的单板类型以及单板的功能设计和数量做任何限制。
现有技术在进行低速率业务的承载时,需要进行多层的映射,以采用现有的高速率OTU接口帧完成业务数据传输。高速率指的是传输速率至少为2.5Gbps。这么做的问题是:处理流程复杂,带宽利用率低,还存在处理时延较大的问题。一种较为直接的方式是在OTN中引入 更小速率的数据帧,例如,为E1信号引入一个速率匹配的低速率数据帧。多个低速率数据帧再映射到ODU0或者其他现有的ODU容器中传输。这么做可以一定程度的简化流程,提高带宽利用率,但是还有两个问题。第一个问题是,还是OTN支持的线路接口速率为2.5Gbps的OTU1,需要将多个更低速率的数据帧一起处理,还是存在较大的处理时延。另外一个问题是,支持较多的数据帧处理层次会大大地提升OTN设备成本。
为此,本申请提供了一种新的业务承载的方法,以降低业务处理复杂度并同时降低OTN设备成本。相对于上述本领域技术人员可以想到的替代方法,本申请提供的方法通过新定义可用于客户设备接口和OTN设备连接客户设备接口的接口数据帧,可有效降低设备成本。
需要说明的是,如无特殊说明,本申请提到的数据帧的速率的数值可以在一定范围变化。因而,如果一个数据帧的速率为在一个固定速率上有预定的范围内变化的数值,那么可以简单地描述为该数据帧的速率为该固定速率。例如,一个数据帧的速率为(1.25Gbps(1-100ppm),1.25Gbps(1+100ppm)),可以描述为该数据帧的速率为1.25Gbps。(1.25Gbps(1-100ppm),1.25Gbps(1+100ppm))也可以简单写成1.25Gbps±100ppm。其中,ppm为百万分之一(part per million)。还需要说明的是,本申请提到的数据帧的速率指的是数据帧的比特速率。数据帧对应的传输通道提供的带宽数值等于数据帧的比特速率数值。例如,数据帧的速率为1.25Gbps,那么数据帧对应的传输通道提供的带宽为1.25G。
在不同的实施例中,数据帧具体可以为OTN业务传输帧、光业务单元帧或光数据单元帧,或者是基于这些帧进行处理后输出的帧。具体可参见后续实施例的说明,在此不予赘述。
图4a为本申请提供的一种业务承载的方法流程示意图。如图4a所示,该方法包括如下三个步骤。
S401:获取业务数据;
具体地,可以是设备自己产生该业务数据或可以是其他设备发送的业务数据。例如,图2所示的客户设备1产生业务数据。或者,如图2所示的OTN设备3接收OTN设备1发送的OTU1帧中包含该业务数据。
S403:映射所述业务数据到一个或多个OTN业务传输帧中,所述一个或多个OTN业务传输帧的速率为1.25吉比特每秒(Gbps)或10.3125Gbps;
OTN业务传输帧是一个新定义的数据帧,也可以称为光业务传输帧。OTN业务传输帧有多种实现方式。具体可参见图5和图9的实施例中给出的多种具体实例,在此不予赘述。
S405:用X吉比特以太网传输模块发送所述一个或多个OTN业务传输帧,所述X吉比特以太网传输模块的速率和所述一个或多个OTN业务传输帧的速率匹配,其中,X等于1或10。
当X=1时,所述X吉比特以太网传输模块为GE传输模块。具体地,GE传输模块可以为双绞线或GE光收发模块(后者也可以简称为光模块)。当X=10时,所述X吉比特以太网传输模块为10GE光模块。GE传输模块和10GE光模块可以是现有商用的模块。或者,可以如图14所示的支持本申请业务承载的方法的传输模块。以太网传输模块也可以称为以太网物理接口。类似地,以太网光模块也称为以太网光接口;双绞线也可以称为以太网电接口。
需要说明的是,速率匹配指的是OTN业务传输帧的速率和X吉比特以太网传输模块的速率的差别在预定的范围内。例如,100ppm或者是更小的范围内。
图4b所示为业务数据的处理层次示意图。具体地,业务数据首先映射到OTN业务传输帧,然后再利用GE或者10GE传输模块进行传输。通过新定义一个数据帧和现有低成本的X吉比特以太网传输模块进行匹配使用,即定义一个低速率的接口数据帧,本申请揭示的技术方案可 以简化业务承载的复杂度并有效较低设备成本。
需要说明的是,本申请的术语“第一”、“第二”等是用于区别类似的对象,而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换,以便这里描述的实施例能够以本申请未描述的顺序实施。“和/或”用于描述关联对象的关联关系,表示可以存在三种关系。例如,A和/或B,可以表示:单独存在A,同时存在A和B,单独存在B这三种情况。方法实施例中的具体操作方法也可以应用于装置实施例中。反之,装置实施例中的组件功能描述也适用于方法实施例中的相关描述。
还需要说明的是,除非特殊说明,一个实施例中针对某一技术特征的描述也可以应用于解释其他实施例提及对应的技术特征。例如,在一个实施例中关于以太网传输模块的具体描述,可以适用于其他实施例中的以太网传输模块。又如,在一个实施例中关于针对定界信息包含的具体字段和添加定界信息的具体实现方式,可以适用于其他实施例中的提及的定界信息和添加定界信息步骤。
下面将基于上面描述的本申请的一些共性方面,对本申请技术方案进一步说明。
图5为本申请实施例提供的第一种业务承载的方法流程示意图。本实施例以客户设备为例进行说明。如图5所示,该方法包括如下多个步骤。
S501:获取低速业务的数据;
具体地,客户设备1获取低速业务的数据。例如,低速的SDH业务(例如虚拟容器(Virtual Container,VC)12、VC3和VC4)、E1、E3和E4这些低速率的准同步数字体系(Plesiochronous Digital Hierarchy,PDH)业务,低速以太网业务、工业物联网业务以及新兴业务等。新兴业务可以包括例如视频、VR(Virtual Reality),AR(Augmented Reality)等。
S503:映射所述业务数据到多个光业务单元(OSU)帧中;
图6为一种OSU帧的结构示意图。如图6所示,OSU帧包括开销区和净荷区。其中,开销区用于承载开销信息,例如业务标识和净荷区承载的业务数据长度(图6中标识为净荷长度)信息。净荷区用于承载低速业务。通常地,OSU帧的大小为16字节(Byte,简写为B)的整数倍。为简化设备处理,通常定义一种固定长度的OSU帧。图6所示的OSU帧长为128字节,即16B*8。不同的低速业务所对应的数据数量可能不同。一个业务数据可能可以承载在一个OSU帧。或者,一个业务数据需要拆分映射到多个OSU帧中。需要说明的是,OSU帧也称为光业务数据单元(optical service data unit,OSDU)帧。
可选地,OSU帧的净荷区可能包含填充信息。例如,一个业务数据或者业务数据的部分没有占满一个OSU帧的净荷区时,可以填入填充信息。又如,因为预先设定净荷区的占用比例或者大小,不能承载业务数据的部分可以写入填充信息。
S505:对所述多个OSU帧做适配处理,以得到多个OTN业务传输帧,所述多个OTN业务传输帧的速率为1.25或10.3125Gbps;
在一种具体实现中,适配处理为添加定界信息。具体的添加定界信息的方式有多种,下面分别进行说明。
图7a为一种包含定界信息的数据帧的结构示意图。如图7a所示的数据帧包括OSU帧、帧开始标识和帧结束标识。例如,帧开始标识和帧结束标识可以分别采用8B/10B编码方式中采用的控制编码K27.7和K29.7。又如,帧开始标识和帧结束标识也可以采用其他字符。例如,可以采用64B/66B编码中定义的开始字符和结束字符。或者,也可以采用自定义的其他特殊字符,以表示OSU帧的开始或者结束。
图7b为另一种包含定界信息的数据帧的结构示意图。如图7b所示的数据帧包括多个OSU帧和位于每个OSU帧之前的定界信息。定界信息用于确定OSU帧的开始位置,从而进行数据解析。示例地,定界信息可以包括帧长度字段、多个纠错信息(如图7b所示的纠错信息1和纠错信息2)。在图7b中,纠错信息1用于实现对帧长度字段的单比特纠错,也可以称为纠错码(Error Correction Code,ECC)。帧长度字段用指示OSU帧的帧长。纠错信息2用于实现对帧长度字段和纠错信息1进行纠错。具体地,可以采用循环冗余检验(cyclic redundancy check,CRC)来实现。定界信息的长度可以为2个字节或者3个字节等。在图7b所示的示例中,如果定界信息的长度为2B,那么帧长度字段占用1B,纠错信息1占用5比特,纠错信息2占用3比特(即是用CRC3)。具体地,纠错信息(纠错信息1和/或纠错信息2)会随着帧长度的变化而变化。如果OSU帧不变,那么纠错信息的取值也不会变化。从而接收端设备可以通过从接受的数据流中识别出信息不变的帧长度信息以及匹配的纠错信息来确定OSU帧的开始位置。类似地,如果帧长度变化,那么对应地,纠错信息X会随之有规律的变化。如此,也可以通过帧长度信息以及匹配的纠错信息识别出一个数据流中OSU帧的开始位置。需要说明的是,纠错信息1是可选的。也可以通过一个纠错信息和帧长度信息配合来完成帧定界。
可选地,适配操作还可以包括编码操作。具体地,编码操作可以为8B/10B编码、64B/66B编码或其他编码方式,以提高数据传输的可靠性。当帧开始标识和帧结束标识分别采用K27.7和K29.7、且编码方式采用8B/10B编码时,可以重用现有的以太网物理层处理模块,降低设备成本。
可选地,适配操作还可以包括数据压缩。数据压缩是针对净荷区包含填充信息的场景。图8为图5所示实施例中经过压缩的数据帧示意图。如图8所示,压缩前的OSU帧的净荷区长度为120字节,删除填充(即数据压缩)后的OSU帧的长度为80字节。因此,在一个业务数据传输中,可能存在未压缩的OSU帧和压缩了的OSU帧都存在的情况(亦可以简称为混合传输方式)。通过数据压缩得到的多个OTN业务传输帧中仅包含有效业务数据和必要的开销,提高了网络带宽利用率,也可以降低业务处理时延。
可选地,适配操作还可以包括扰码操作,以抑制线路码中的长连“0”和长连“1”,便于从线路信号中提取时钟信号。例如,可以采用自同步扰码或帧同步扰码的方式。
需要说明的是,当适配操作包括多个具体动作时,这些具体动作的顺序可以调换。例如,可以先进行压缩,再添加定界信息。或者,可以先添加定界信息,再进行压缩。
在本实施例中,OTN业务传输帧可能是包含了定界信息的OSU帧、包含了定界信息并进行8B/10B编码的OSU帧,或者是包含了定界信息和进行压缩了的OSU帧。不论进行前述提及的何种具体操作,输出的OTN业务传输帧的速率为1.25或10.3125Gbps。OTN业务传输帧可以称为增强的OSU(enhanced OSU,OSUe)帧。
以OSU帧的长度是128字节(具体帧结构如图6所示)、OTN业务传输帧的速率为1.25Gbps为例,来说明OTN业务传输帧可以承载的业务数据的速率大小。在本示例中,假设OSU帧添加了帧开始标识和帧结束标识,增加了2字节,然后进行了8B/10B编码,以得到OTN业务传输帧。那么,OTN业务传输帧用于承载业务数据的净荷速率最高为1.25Gbps*120/(128+2)*80%=0.923Gbps。其中,120是净荷区的大小;80%是8B/10B编码后有效数据的百分比。也就是说,业务数据可以占用的带宽是0.923G。
进一步地,以E1业务为例来描述OTN业务数据帧压缩带来的技术优势。如果采用128字节的OSU帧来承载,那么业务装载时间等于E1业务积攒OSU帧净荷区大小(例如图6所示的120 字节)的时间,即120*8/2.048=468.75微秒(μs),时延较大。其中,2.048为E1的速率。如果限定净荷区中仅有30字节用于承载业务数据,且将承载了业务数据的OSU帧进行压缩再传输,那么E1装载时间为30*8/2.048=117.1875μs,仅为原来的四分之一。由此可见,通过压缩OSU帧可以降低针对某一业务承载的处理的时延。
除了上面提到针对某一业务本身处理带来的时延降低,当有多个低速率业务数据同时待处理时,OTN业务传输帧的压缩也可以降低其他并行的业务数据的等待时长。假设一个带宽为1.25G的接口最多可以同时承载112个E1业务。以一个设备同时接收到112个E1业务为例,那么最长的等待时间是:111个E1的传输时间,即111*130*8(bit)/1.25(Gbps)=92.352μs。如果对OSU帧进行压缩,那么其他业务数据的等待时延大幅地下降,即111*40*8(bit)/1.25(Gbps)=28.416μs。
S405:用X吉比特以太网传输模块发送所述多个业务传输帧,所述X吉比特以太网传输模块的速率和所述多个业务传输帧的速率匹配,其中,X等于1或10。
具体参见图4a针对S405的描述,在此不再赘述。需要说明的是,业务传输帧需要采用8B/10B编码,才能使用双绞线进行数据传输。
通过新定义一个OSU帧并对其进行适配处理,以实现与现有低成本的X吉比特以太网传输模块的速率匹配,本申请揭示的技术方案可简化业务承载的处理复杂度并降低设备成本。
图9为本申请实施例提供的第二种业务承载的方法流程示意图。该实施例中,以客户设备为例进行说明。如图9所示,该方法包括如下步骤。
S501:接收低速业务的数据;
具体参见图5关于S501的步骤,在此不再赘述。
S901:映射所述业务数据到多个光业务单元(OSU)帧中;
S901和图5中的步骤S503相同,关于该步骤和OSU帧的具体描述参见图5中针对步骤S503的描述,在此不再赘述。不同的是,在本实施例中,S901是一个可选的步骤。如果本实施例的方法中不包括S901,业务数据直接映射到步骤S903的ODU帧中。引入OSU帧的好处是,OSU帧能够更好的匹配低速业务的速率需求,在OTN中可以引入OSU帧颗粒度的交叉操作,提高了端到端业务处理的灵活性。具体可参见图12的实施例,在此不予赘述。
S903:将所述多个OSU帧映射到一个光数据单元帧中;
S905:对所述光数据单元帧执行如下操作的一个或多个:添加FEC信息、添加定界信息和/或编码处理,以得到一个OTN业务传输帧,所述OTN业务传输帧的速率为1.25或10.3125Gbps;
图10a给出了一个包含了定界信息的光数据单元帧示意图。如图10a所示,光数据单元帧为4行3824字节列的结构。其中,光数据单元帧的1-16列为开销区,包括帧头指示、复帧指示、路径监控开销和净荷类型开销,其他部分为预留字段;17-3824列为净荷区,用于承载多个OSU帧。其中,帧头指示用于指示所述光数据单元帧的开始位置。复帧指示用于指示当前光数据单元帧属于多个连续的光数据单元帧中的第几个。路径监控开销用于监控路径质量,即,传递光数据单元帧传输的路径的质量信息。具体地,路径监控开销可以包括如下信息的一个或者多个:路径踪迹信息(Trail trace Identifier,TTI)、8比特奇偶校验(8-Bit Interleaved Parity,BIP8)、后向错误指示(Backward Error Indication,BEI)、后向缺陷指示(Backward Defect Indication,BDI)和状态信息(Status information,STAT)开销。净荷类型(payload type,PT)开销用于指示所述光数据单元帧所承载业务映射到所述光数据单元帧的映射方式。PT开销也 可以成为业务映射类型。具体地,可以预先设定PT为某一数值,例如0x25,来表明光数据单元帧承载为OSU帧。
需要说明的是,光数据单元帧的1-16列中预留字段也可以用于承载OSU帧,以提高光业务单元帧的带宽利用率。这么做,前述光数据单元帧仅包含前述的开销(如图10a所示)。此外,图10a针对具体开销位置仅为示例,也可以替换为其他排列方式。例如,将前述多个开销从第一行开始放置,占据连续的几列,剩余的位置用来作为净荷区。这么做,可以简化数据帧解析。
图10a给出了为光数据单元帧添加定界信息的一种具体示例。如图10a所示,在数据帧的每一行的第一个字节之前和最后一个字节之后添加定界信息;或者,以整个光数据单元帧为单位,在该帧的第一个字节之前或者最后一个字节之后添加定界信息。关于定界信息的描述可以参见图7a和图7b的介绍,在此不再赘述。
图10b为另一种包含FEC信息的光数据单元帧示意图。如图10b所示,在光数据单元帧结构添加了一个前向纠错(Forward Error Correction,FEC)区,大小为4行256字节列(即图10b中的所示的第3825-4080列)。FEC区域用于实现对光数据单元帧传输过程中发生的比特错误纠正。可选地,如图10b所示,光数据单元帧可能还包括段监控(Section Monitoring,SM)开销,SM用于链路监控。SM包含的信息同前述关于路径监控信息的描述,在此不再赘述。
可选地,还可以对光数据单元帧进行编码处理,以获取OTN业务传输帧。
需要说明的是,图10b所示的指示一种添加FEC的方式。或者,还可以通过其他方式插入FEC信息。例如,可以每隔239列间插16列的FEC信息。又如,可以每隔478列间插32列的FEC信息。这么做的好处是,可以基于FEC符号大小灵活构建OTN业务传输帧,降低FEC的编解码处理时延,进而降低帧处理整体时延。
需要说明的是,图10a和图10b所述的OSU帧映射到光数据单元帧的方式仅是一种示例。在具体的应用中,可以将光数据单元帧的净荷区划分多个净荷块。连续的多个预设数量的净荷块作为一个传送周期。OSU帧映射到数据单元帧时,占用一个传送周期的部分或全部净荷块。一个OSU帧可以放置到一个或者多个净荷块中。对比,本申请不做限定。
在本实施例中,OTN业务传输帧可能是包含了定界信息的光数据单元帧、包含了定界信息并进行8B/10B编码的光数据单元帧、包含了定界信息和FEC信息的光数据单元帧。不论进行前述提及的何种具体操作,输出的OTN业务传输帧的速率为1.25或10.3125Gbps。
当OTN业务传输帧的速率为1.25Gbps时,也可以称其为降频的光数据单元0帧(under-clocked optical data unit 0,ODU0u)、超频的光数据单元0帧(over-clocked optical data unit 0,ODU0o)、增强的光数据单元0帧(ODU0e)或以太光数据单元帧。或者,如果ODU0e包含了FEC信息,亦可以称其为光传输单元0帧(under-clocked optical transport unit 0,OTU0u)、超频的光传输单元0帧(over-clocked optical transport unit 0,OTU0o)、增强的光传输单元0帧(OTU0e)或以太光传输单元帧。
需要说明的是,ODU0是现有OTN标准定义的传输容器,其速率为1.24416Gbps,不能作为接口传输容器,即需要映射到更高阶的OTU帧(如OTU1)中才能在设备间传输。而本实施例体提供的ODU0e或OTU0e是可以利用以太网传输模块直接从一个设备发送到另一个设备,以较低地设备成本来实现业务数据的传输。
当OTN业务传输帧的速率为10.3125Gbps时,也可以称其为降频的光数据单元2帧(under-clocked optical data unit 2,ODU2u)或超频的光数据单元2帧(over-clocked optical data unit 2, ODU2o)。或者,如果ODU2u包含了FEC信息,亦可以称其为光传输单元2帧(under-clocked optical transport unit 2,OTU2u)或超频的光传输单元2帧(over-clocked optical transport unit 2,OTU2o)。
需要说明的是,ODU2是现有OTN标准定义的传输容器,其速率为10.037273924Gbps,需要映射到OTU2,并采用OTU2光模块才能在设备之间进行传输。而本实施例体提供的ODU2u是可以利用以太网传输模块直接从一个设备发送到另一个设备,实现业务数据的传输。
图11a和图11b给出了又两种OTN业务传输帧的结构示意图。这又两种OTN业务传输帧的区别在于图11b所示的OTN业务传输帧包含了FEC区域。具体地,该FEC区域的大小可以为140比特列或300比特列,分别采用RS(528,514)或者RS(544,514)FEC编码方式。图11a和图11b相同的部分大小为:128行5140比特列,包含对齐开销,其他开销和承载了多个OSU帧的净荷区。其他开销可以为如下信息的一个或多个:TTI、BIP8、BEI、BDI和STAT。该帧包含的行数也可以是256行、1024行等64的整数倍。对此,本申请不做限定。
图11a和图11b所示的帧结构中的开销比例较小,作为OTN业务传输帧时,可以得到较高地净荷区传输速率,提高了带宽利用率。
可选地,图11a和图11b所示的OTN业务传输帧也可以进行添加定界信息。具体可以添加在其他开销中,或者如图10a的方式来添加定界信息。可选地,图11a和图11b所示的OTN业务传输帧也可以进行编码。如果执行这些可选的操作,那么下一步骤中的OTN业务传输帧指的是执行了这些操作后的数据帧。
S405:用X吉比特以太网传输模块发送所述OTN业务传输帧,所述X吉比特以太网传输模块的速率和所述OTN业务传输帧的速率匹配,其中,X等于1或10。
具体参见图4a针对S405的描述,在此不再赘述。
通过定义多种新的OTN业务传输帧,以实现与现有低成本的X吉比特以太网传输模块的速率匹配,本申请揭示的技术方案可以简化业务承载的复杂度并有效较低设备成本。
图12为本申请实施例提供的第三种业务承载的方法流程示意图。该实施例以业务数据需要从客户设备1,经由OTN设备1和OTN设备3,传输到客户设备4中为例进行说明。如图12所示,该方法包括如下多个步骤。
客户设备1执行:
S1201:将业务数据映射到多个光业务单元(OSU)帧中;
S1203:对所述多个OSU帧做适配处理,以得到多个OTN业务传输帧,所述多个OTN业务传输帧的速率为1.25Gbps;
S1205:用GE光发送模块发送所述多个业务传输帧。
上述三个步骤类似图5中的步骤S503、步骤S505和步骤S405,可参见图5对应步骤的描述,在此不再赘述。
需要说明的是,上述三个步骤还可以替换为图9所示的S901、S903、S905和S405,或图9中的任意一种具体实现方式。
OTN设备1执行:
接收所述多个业务传输帧(图12未示出,后续接收步骤类似,不再赘述。);
S1207:从所述多个OTN业务传输帧解析出所述多个OSU帧;
S1209:对所述多个OSU帧进行交叉后,将所述多个OSU帧中的部分数据帧映射到2.5Gbps或以上的OTN帧,所述部分数据帧的目的设备为客户设备4;
S1211:发送所述OTN帧;
具体地,OTN设备1对OTN业务传输帧进行解析,获得所述多个OSU帧。具体地,解析可以包括删除定界信息、解码和/或添加填充信息等处理。或者,如果客户设备1的动作替换为图9中的多个步骤,那么解析具体可以包括进行FEC解码、删除定界信息、解码和/或解映射。应理解,OTN设备1执行的处理操作为客户设备1的逆操作。然后,OTN设备1对解析出的多个OSU帧进行交叉处理,将多个OSU帧的部分或者全部映射到高速率的线路OTN帧发送出去(例如2.5G的OTU1帧)。交叉处理指的是将数据帧从一个端口调度另外一个输出端口。具体调度到哪一个端口可以根据该数据帧需要发送的目的设备来确定。在步骤S1209中,以多个OSU帧中的部分帧的目的设备为客户设备4为例,这部分OSU帧都会交叉到同一个端口发送到下一个OTN设备(例如本示例中的OTN设备3)。
OTN设备3执行:
接收所述OTN帧;
S1213:从所述OTN帧解析出所述部分数据帧;
S1215:对所述部分数据帧做适配处理,以得到多个另一OTN业务传输帧,所述另一OTN业务传输帧的速率为1.25Gbps;
S1217:用GE光发送模块发送所述多个另一OTN业务传输帧。
具体地,OTN设备3从所述OTN帧解映射出所述部分数据帧。然后,OTN设备3执行类似本实施例中步骤S1203和S1205的处理,具体参见相关描述,在此不再赘述。
客户设备4执行:
接收所述多个另一OTN业务传输帧。
S1219:从所述多个另一OTN业务传输帧解析出所述部分数据帧;
S1221:从所述部分或数据帧中解析出所述业务数据的部分数据,所述业务数据的部分数据的目的设备为客户设备4。
通过定义多种新的OTN业务传输帧,以实现与现有低成本的X吉比特以太网传输模块的速率匹配,本申请揭示的技术方案可以简化业务承载的复杂度并有效较低设备成本。此外,通过引入OSU帧交叉,OTN设备无需再将多个发现不同目的设备的业务数据解析出来,直接利用OSU帧来处理,本申请实施例揭示地方案提升了端到端业务处理的灵活性。
需要说明的是,图4a、图9和图12是以OTN业务传输帧直接通过以太网传输模块发送的的角度来描述的。应理解,OTN业务传输帧也可以是图4a和图9中的OSU帧、进行了一些适配处理的OSU帧或光数据单元帧。对应地,OTN业务传输帧的比特速率可能不再是1.25Gbps或10.31.25Gbps。在一些可能的实现方式中,进行了例如添加定界信息、编码和/或压缩的OTN业务传输帧的比特速率才是1.25Gbps或10.31.25Gbps。以OSU帧是OTN业务传输帧为例,如果OSU帧还进行了例如10B/8B编码后再利用以太网光模块进行传输。那么,进行了8B/10B编码的OSU帧(即进行了8B/10B编码的OTN业务传输帧)的比特速率为1.25Gbps或10.31.25Gbps。
图13为本申请实施例提供的一种业务处理的芯片的结构示意图。如图13所示,芯片1300包括处理器1301和与处理连接的存储器1302。存储器1302用于存储处理器所执行必要的程序指令和数据。处理器1301用于实现上述任意一个或多个实施例中某一设备所执行的方法步骤。例如,处理器1301用于执行图4a、图5或图9中除了步骤S405外的其他方法步骤,以及发送所述OTN业务传输帧发送给X吉比特以太网模块。又如,处理器1301用于执行图12所述的任一设备执行除发送或者接收数据帧给其他设备的方法步骤,以及发送生成的数据帧给X吉比特以 太网模块(如S1205)或从所述X吉比特以太网模块接收数据帧。具体步骤参见相关附图的说明,在此不再赘述。
需要说明的是,本申请涉及的用户设备和OTN设备通常同时具备收发功能。所以,处理器1301可能用于实现图12中两个用户设备的方法步骤,或用于实现两个OTN设备的方法步骤,以同时支持业务的收发功能。还需要说明的是,存储器1302也可以不包含在芯片1300内,而是通过电路与处理器1301实现连接。
还需要说明的是,图13所示的示例为单一芯片是实现方式。在另外的具体是实现方式中,也可以采用芯片组的方式。例如,采用两个芯片来完成图13所示一个芯片的功能。以图5所示的实施例为例,一个芯片完成步骤S501和S503,另外一个芯片完成S505和发送OTN业务传输帧给X吉比特以太网传输模块。对于多个芯片具体的功能划分,本申请不做限定。
图14为本申请实施例提供的一种以太网光模块的结构示意图。如图14所示,以太网光模块1500包括图13所示的芯片1300、调制器1501、光源1502和光接口1503。芯片1300和光源1502均与调制器1501相连。调制器1501用于将芯片1300输出的数据信号调制到光源1502输出的连续光源上,再通过光接口1503发送出去。需要说明的是,以太网光模块1500可以通过光接口1503插到图1所示的用户设备或OTN设备上对应的接口上,完成相关业务传输。
图15为本申请实施例提供的一种用户设备的结构示意图。用户设备1600提供了两种类型的硬件结构来实现本申请方法实施例提及的低速业务承载。一种是通过图14所示的以太网光模块1500连接业务处理器1601的方式。其中,业务处理器1601用于完成业务数据传输到以太网光模块1500之前需要完成的处理。例如,生成所述业务数据或者对业务数据进行校验等其他处理。另外一种是提供一种实现业务承载的单板,该单板包括了图13所示的芯片1300。
本申请实施例还提供一种OTN设备。本实施例中的OTN设备的硬件结构如图4a所示;其中,支路板包括了图13所示的芯片1300;或者支路板包括了图14所示的以太网光模块1500。
本申请实施例中处理器(例如:处理器1301)可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件,可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成,或者用处理器中的硬件及软件单元组合执行完成。处理器用于实现上述方法所执行的程序代码可以存储在存储器(例如:存储器1302)中。存储器可以是非易失性存储器,比如硬盘(hard disk drive,HDD)等,还可以是易失性存储器(volatile memory),例如随机存取存储器(random-access memory,RAM)。存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质,但不限于此。
基于以上实施例,本申请实施例还提供了一种计算机可读存储介质。该存储介质中存储软件程序,该软件程序在被一个或多个处理器读取并执行时可实现上述任意一个或多个实施例提供的方法。所述计算机可读存储介质可以包括:U盘、移动硬盘、只读存储器、随机存取存储器、磁碟或者光盘等各种可以存储程序代码的介质。
本领域内的技术人员应明白,本申请的实施例可提供为方法、系统、或计算机程序产品。因此,本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形 式。
本申请是参照根据本申请实施例的方法、设备(系统)和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然,本领域的技术人员可以对本申请实施例进行各种改动和变型而不脱离本申请实施例的范围。这样,倘若本申请实施例的这些修改和变型属于本申请权利要求及其等同技术的范围之内,则本申请也意图包含这些改动和变型在内。
Claims (23)
- 一种业务承载的方法,其特征在于,所述方法包括:接收业务数据;映射所述业务数据到一个或多个光传送网(OTN)业务传输帧中,所述一个或多个OTN业务传输帧的速率为1.25吉比特每秒(Gbps)±100ppm或10.3125Gbps±100ppm,ppm为百万分之一;用X吉比特以太网传输模块发送所述一个或多个OTN业务传输帧,所述X吉比特以太网传输模块的速率和所述一个或多个OTN业务传输帧的速率匹配,其中,X等于1或10。
- 如权利要求1所述的业务承载的方法,其特征在于,所述映射所述业务数据到一个或多个OTN业务传输帧中,具体包括:将所述业务数据映射到多个光业务单元(OSU)帧中,所述多个OSU帧的每一个为整数倍的16字节块,所述OSU帧包括开销区和净荷区,所述净荷区用于承载所述业务数据,所述开销区用于携带帧开销;将承载了所述业务数据的所述多个OSU帧进行适配处理,以获得所述多个OTN业务传输帧。
- 如权利要求2所述的业务承载的方法,其特征在于,所述将承载了所述业务数据的所述多个OSU帧进行适配处理,具体包括:为所述多个OSU帧的每一个添加定界信息;或者,为所述多个OSU帧的每一个添加定界信息和进行编码;或者,为所述多个OSU帧的每一个添加定界信息、进行编码和执行压缩,所述执行压缩包括删除所述多个OSU帧中的填充信息,所述编码为8B/10B编码或64B/66B编码。
- 如权利要求3所述的业务承载方法,其特征在于,为所述多个OSU帧的每一个添加定界信息,具体包括:为所述多个OSU帧的每一个添加帧开始标识和帧结束标识;或,在所述多个OSU帧的每一个帧之前插入所述定界信息。
- 如权利要求1所述的业务承载方法,其特征在于,所述映射所述业务数据到一个或多个OTN业务传输帧中,具体包括:将所述业务数据映射到多个光业务单元(OSU)帧中,所述多个OSU帧的每一个为整数倍的16字节块,所述OSU帧包括开销区和净荷区,所述净荷区用于承载所述业务数据,所述开销区用于携带帧开销;将承载了所述业务数据的所述多个OSU帧映射到一个光数据单元(ODU)帧中,以获得所述OTN业务传输帧。
- 如权利要求5所述的业务承载的方法,其特征在于,所述ODU帧为4行3824字节列结构,仅包括帧头指示、复帧指示、链路监控开销、净荷类型和净荷区;其中,所述帧头指示用于指示所述ODU帧的开始位置,所述复帧指示用于指示所述ODU帧在一组连续ODU帧的位置,所述链路监控开销用于进行链路监控,所述净荷类型用于指示所述ODU帧承载业务的映射方式,所述净荷区用于承载所述多个OSU帧。
- 如权利要求5所述的业务承载的方法,其特征在于,所述ODU帧为64的整数倍行5140比特列结构,包括对齐开销和净荷区,其中,所述对齐开销用于指示所述ODU帧的开始位 置,所述净荷区用于承载所述多个OSU帧。
- 如权利要求5-7任一所述的业务承载方法,其特征在于,所述ODU帧为所述OTN业务传输帧。
- 如权利要求5-7任一所述的业务承载的方法,其特征在于,所述将承载了所述业务数据的所述多个OSU帧映射到一个ODU帧中,以获得所述OTN业务传输帧,具体包括:将所述多个OSU帧映射到一个ODU帧中;对所述ODU帧执行如下操作的一个或者多个,以获得所述OTN业务传输帧:添加FEC信息、添加定界信息和编码处理,其中,所述编码处理为8B/10B编码处理或64B/66B编码处理。
- 如权利要求1-9任一所述的业务承载的方法,其特征在于,X=1,所述X吉比特以太网模块发送所述OTN业务传输帧,具体包括:用双绞线或1 GE光模块发送所述OTN业务传输帧。
- 如权利要求1-9所述的业务承载方法,其特征在于,X=10,所述X吉比特以太网模块发送所述OTN业务传输帧,具体包括:用10GE光模块发送所述OTN业务传输帧。
- 一种业务处理装置,其特征在于,所述装置包括存储器和处理器,所述存储器用于存储计算机程序,所述处理器用于执行如下方法:接收业务数据;映射所述业务数据到一个或多个光传送网(OTN)业务传输帧中,所述一个或多个OTN业务传输帧的速率为1.25吉比特每秒(Gbps)或10.3125Gbps;将所述OTN业务传输帧发送给X吉比特以太网传输模块,所述X吉比特以太网传输模块的速率和所述一个或多个OTN业务传输帧的速率匹配,其中,X等于1或10。
- 如权利要求12所述的装置,其特征在于,所述映射所述业务数据到一个或多个OTN业务传输帧中,具体包括:将所述业务数据映射到多个光业务单元(OSU)帧中,所述多个OSU帧的每一个为整数倍的16字节块,所述OSU帧包括开销区和净荷区,所述净荷区用于承载所述业务数据,所述开销区用于携带帧开销;将承载了所述业务数据的所述多个OSU帧进行适配处理,以获得所述多个OTN业务传输帧。
- 如权利要求12所述的装置,其特征在于,所述映射所述业务数据到一个或多个OTN业务传输帧中,具体包括:将所述业务数据映射到多个光业务单元(OSU)帧中,所述多个OSU帧的每一个为整数倍的16字节块,所述OSU帧包括开销区和净荷区,所述净荷区用于承载所述业务数据,所述开销区用于携带帧开销;将承载了所述业务数据的所述多个OSU帧映射到一个光数据单元(ODU)帧中,以获得所述OTN业务传输帧。
- 一种设备,其特征在于,所述设备包括如权利要求12-14任一所述的装置和所述X吉比特以太网传输模块。
- 一种获取业务的方法,其特征在于,所述方法包括:用X吉比特以太网传输模块接收一个或多个光传送网(OTN)业务传输帧,所述一个或多个OTN业务传输帧的速率为1.25吉比特每秒(Gbps)或10.3125Gbp,所述X吉比特以太 网传输模块的速率和所述一个或多个OTN业务传输帧的速率匹配,其中,X等于1或10;从所述一个或多个OTN业务传输帧解析出业务数据。
- 如权利要求16所述的方法,其特征在于,所述从所述一个或多个OTN业务传输帧解析出业务数据,具体包括:对所述一个或者多个OTN业务传输帧进行删除定界信息处理,或者解码和删除定界信息处理,以获得多个OSU帧,所述多个OSU帧的每一个为整数倍的16字节块,所述OSU帧包括开销区和净荷区,所述净荷区用于承载所述业务数据,所述开销区用于携带帧开销,所述解码为8B/10B解码或64B/66B解码;从所述多个OSU帧中解映射出所述业务数据。
- 如权利要求16或17所述的方法,其特征在于,所述一个或者多个OTN业务传输帧为光数据单元(ODU)帧,所述光数据单元帧为下列两个结构的任意一个:第一种结构:4行3824字节列结构,仅包括帧头指示、复帧指示、链路监控开销、净荷类型和净荷区;其中,所述帧头指示用于指示所述ODU帧的开始位置,所述复帧指示用于指示所述ODU帧在一组连续ODU帧的位置,所述链路监控开销用于进行链路监控,所述净荷类型用于指示所述ODU帧承载业务的映射方式,所述净荷区用于承载多个OSU帧;和,第二种结构:64的整数倍行5140比特列结构,包括对齐开销和净荷区,其中,所述对齐开销用于指示所述ODU帧的开始位置,所述净荷区用于承载所述多个OSU帧;从所述一个或多个OTN业务传输帧解析出业务数据,具体包括:从所述光数据单元帧中解映射出所述多个OSU帧;从所述多个OSU帧中解映射出所述业务数据。
- 如权利要求16所述的方法,其特征在于,所述从所述一个或多个OTN业务传输帧解析出业务数据,具体包括:对所述一个或者多个OTN业务传输帧进行FEC解码,以获得光数据单元(ODU)帧,所述光数据单元帧用于承载多个OSU帧;从所述光数据单元帧中解映射出所述多个OSU帧;从所述多个OSU帧中解映射出所述业务数据。
- 如权利要求19所述的方法,其特征在于,所述光数据单元帧为下列两个结构的任一个:第一种结构:4行3824字节列结构,仅包括帧头指示、复帧指示、链路监控开销、净荷类型和净荷区;其中,所述帧头指示用于指示所述ODU帧的开始位置,所述复帧指示用于指示所述ODU帧在一组连续ODU帧的位置,所述链路监控开销用于进行链路监控,所述净荷类型用于指示所述ODU帧承载业务的映射方式,所述净荷区用于承载多个OSU帧;和,第二种结构:64的整数倍行5140比特列结构,包括对齐开销和净荷区,其中,所述对齐开销用于指示所述ODU帧的开始位置,所述净荷区用于承载所述多个OSU帧。
- 一种业务处理装置,其特征在于,所述装置包括存储器和处理器,所述存储器用于存储计算机程序,所述处理器用于执行如下方法:接收X吉比特以太网传输模块发送的一个或多个光传送网(OTN)业务传输帧,所述一个或多个OTN业务传输帧的速率为1.25吉比特每秒(Gbps)或10.3125Gbp,所述X吉比特以太网传输模块的速率和所述一个或多个OTN业务传输帧的速率匹配,其中,X等于1或10;从所述一个或多个OTN业务传输帧解析出业务数据。
- 一种设备,其特征在于,所述设备包括权利要求21的业务处理装置和所述X吉比特以太网传输模块。
- 一种系统,其特征在于,所述系统包括如权利要求15所述的设备和权利要求22所述的设备,其中,权利要求15所述的设备发送所述OTN业务传输帧给权利要求22所述的设备。
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