WO2012126409A2 - 统一帧速率的方法和设备 - Google Patents

统一帧速率的方法和设备 Download PDF

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Publication number
WO2012126409A2
WO2012126409A2 PCT/CN2012/074662 CN2012074662W WO2012126409A2 WO 2012126409 A2 WO2012126409 A2 WO 2012126409A2 CN 2012074662 W CN2012074662 W CN 2012074662W WO 2012126409 A2 WO2012126409 A2 WO 2012126409A2
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WO
WIPO (PCT)
Prior art keywords
frame
otu3
otu
service data
clock signal
Prior art date
Application number
PCT/CN2012/074662
Other languages
English (en)
French (fr)
Other versions
WO2012126409A3 (zh
Inventor
区树雄
向晖
黄鹭
赵力野
郭婵
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2012/074662 priority Critical patent/WO2012126409A2/zh
Priority to EP12760841.2A priority patent/EP2618536A4/en
Priority to CN2012800003564A priority patent/CN102687434A/zh
Publication of WO2012126409A2 publication Critical patent/WO2012126409A2/zh
Publication of WO2012126409A3 publication Critical patent/WO2012126409A3/zh
Priority to US13/904,726 priority patent/US20130287401A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/07—Synchronising arrangements using pulse stuffing for systems with different or fluctuating information rates or bit rates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer
    • H04J14/026—Optical medium access at the optical channel layer using WDM channels of different transmission rates

Definitions

  • the present invention relates to the field of optical communication technologies, and in particular, to a method and a device for unifying a frame rate. Background technique
  • the existing optical transform units (OTUs) of the two service types defined for the 40G WDM line are 0TU3 and OTU3e2, respectively, and their rates are 43.01841356Gbps and 44.58335558Gbps, respectively.
  • the local crystal oscillator corresponding to the OTU3 and OTU3e2, that is, the Voltage-Controlled Oscillator (VCO).
  • VCO Voltage-Controlled Oscillator
  • the wavelength division network needs the sampling clock of ultra-high frequency, and needs to communicate with the wavelength division side. There is a certain proportional relationship, which is generated by the local crystal oscillator.
  • the existing 40G WDM service rate has multiple frequency points, for example, the above 0TU3 and OTU3e2 have two frequency points, so that the local crystal oscillator of a plurality of high frequency points is required to provide a plurality of high frequency sampling clock signals, which will increase 40G.
  • the embodiment of the present invention provides a method and a device for unifying a frame rate, which can unify the frame rate of the existing wavelength division service to almost the same frame rate, and eliminate the existing frequency points of the receiving end that are different due to different frame rates. Problems, which in turn reduce implementation difficulty and cost.
  • the embodiment of the invention provides a method for unifying a frame rate, including:
  • the speed-up 0TU frames having different frame rates are transmitted on the wavelength division line.
  • the embodiment of the invention provides a method for unifying a frame rate, including:
  • the data after the decapsulation and the frame processing is output or the data after the frame processing is selected.
  • An embodiment of the present invention provides a sending device, including:
  • the encapsulating module is configured to speed up at least one of the OTU frames having different frame rates, so that the OTU frame can be processed by using the clock signal of the same frequency point at the receiving end;
  • a sending module configured to send, after the speed-up, the OTU frames with different frame rates on the wavelength division line.
  • An embodiment of the present invention provides a receiving device, including:
  • a local crystal oscillator configured to provide a clock signal of a single frequency point for receiving different service data, where at least one of the service data is obtained after speeding up at the transmitting end, and the service data obtained after the speed increasing processing is self-made
  • the OTU frame obtained by the frame mode, and the speed-up OTU frame has a different structure from the OTU frame before the speed increase;
  • a processing module configured to perform DSP and CDR processing on the service data by using the clock signal of the single frequency point
  • a judging module configured to determine, according to a frame format, a type of service data received by the hardware according to a frame format; and a decapsulation and framing module, configured to perform decapsulation and framing processing on the speed-up service data after processing the clock signal using a single frequency point ;
  • a framing module configured to perform framing processing on non-speed-up service data processed by a clock signal using a single frequency point
  • the selection module is configured to select, according to the type of the service data determined by the judging module, the output decapsulation and the framed data or the framed data.
  • the embodiment of the present invention speeds up at least one of the OTU frames of different frame rates, so that the receiving end can process the received OTU frame by using the clock signal of the same frequency point, which can be implemented at the receiving end.
  • the frequency is normalized, then only the receiver needs to be set.
  • Set a local crystal oscillator to avoid the problems caused by setting multiple local crystal oscillators in the prior art, reduce the cost of the wavelength division card, and reduce the layout difficulty.
  • FIG. 1 is a schematic flowchart of a method for unifying a frame rate according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of an OTU3 stuff frame in the present invention.
  • FIG. 3 is a schematic structural diagram of a transmitting end according to the present invention.
  • FIG. 4 is a schematic flowchart of another embodiment of a method for unifying a frame rate according to the present invention.
  • Figure 5 is a schematic structural view of a receiving end in the present invention.
  • FIG. 6 is a schematic structural diagram of an embodiment of a transmitting device according to the present invention.
  • FIG. 7 is a schematic structural diagram of an embodiment of a receiving device according to the present invention.
  • FIG. 8 is a schematic structural diagram of an embodiment of an OTN system according to the present invention. detailed description
  • a client at one end can send data to the client at the other end through optical fibers.
  • it can be divided into a client side and a wavelength division side, the client side includes a device for generating customer data, such as a terminal device, and the wavelength division side includes a device for packaging customer data into an OTN frame, and transmitting an OTN frame.
  • Equipment, optical fiber, etc. Therefore, the two client sides can realize optical network communication through the intermediate wavelength division side.
  • Step 11 A transmitting end speeds up at least one of an OTU frames having different frame rates.
  • the OTU frame can be processed by using the clock signal of the same frequency point at the receiving end; for example, the frame to be sent by the transmitting end is: OTU3 frame and OTU3e2 frame, because the frame rates of the two frames are greatly different, in the prior art Two VCOs need to be set up at the receiving end.
  • the OTU3 frame can be accelerated at the transmitting end, so that the frame rate of the accelerated OTU3 frame is almost the same as the OTU3e2 frame rate, so that a VCO pair OTU3e2 frame and the accelerated OTU3 can be set at the receiving end.
  • the frame is processed.
  • the frame that is accelerated by the OTU3 frame may be referred to as an OTU3 stuff frame, and the frame rate of the OTU3 stuff frame is 57/55 times of the frame rate of the OTU3 frame.
  • the frame rate of the OTU3 frame is 43.01841356 Gbps, which is quite different from the frame rate of the OTU3e2 frame of 44.58335558 Gbps.
  • the frame rate of the OTU3 stuff frame is 57/55 times that of the OTU3 frame, and the frame rate of the OTU3 stuff frame is 44.5827195 lGbps, which is close to the frame rate of the OTU3e2 frame. Therefore, the same local crystal oscillator can be used to provide clock signals for the OTU3 stuff frame and the OTU3e2 frame at the receiving end, so that the rate is unified and the frequency is normalized.
  • the OTU3 stuff frame is a self-framing
  • the self-framed refers to a frame having a determined format, for example, having a determined length, each component having a determined length and position.
  • the format of the OTU3 stuff frame may be different from the structure of the OTU3 frame, and the OTU3 frame and the OTU3e2 frame have the same frame format according to the existing protocol, so that the receiving end can directly determine the received OTU3 stuff frame according to the frame format. Or OTU3e2 frame.
  • the padding bits can be inserted
  • the structure of the OTU3 stuff frame can be as shown in Figure 2.
  • the stuffing part is used to stuff the padding bits
  • the payload part is used to encapsulate the OTU3 service data.
  • the unit of Figure 2 is Bit.
  • the ratio of the frame rate of the OTU3 stuff frame to the frame rate of the OTU3 frame is 57:55.
  • both the OTU3 frame and the OTU3e2 frame may be speed-up processed, so that the frame after the speed-up processing can be processed by the clock signal of the same frequency point at the receiving end.
  • Step 12 The transmitting end sends the accelerated OTU frame with different frame rates on the wavelength division line.
  • the OTU3 service is encapsulated into an OTU3 stuff frame and then transmitted on a 40G WDM line.
  • the OTU3e2 service the OTU3e2 frame is directly placed at 40G. Send on the line.
  • the frame rates of the OTU3 stuff frame and the OTU3e2 frame are almost the same.
  • embodiments of the present invention are not limited to OTU3 frames and OTU3e2 frames, and can also be applied to OTN frames of other rate levels, so that different types of OTU frames of the same rate level have almost the same rate.
  • the OTU3 frame is encapsulated into an OTU3 stuff frame, and the frame rate of the OTU3 stuff frame is 57/55 times that of the OTU3 frame.
  • the frame rate of the OTU3 stuff frame is almost the same as the frame rate of the OTU3e2 frame.
  • the frame rate of the 40G WDM service is unified.
  • the same local crystal oscillator can be used to increase the clock signal for the received 40G WDM service frame, which avoids the problem caused by the local crystal oscillator with two frequency points in the prior art.
  • the cost of the 40G wave splitter card reduces the difficulty of layout.
  • FIG. 4 is a schematic flowchart of another embodiment of a method for unifying a frame rate according to the present invention, including:
  • Step 41 The receiving end provides a clock signal of a single frequency point for receiving different service data, and at least one of the service data is obtained after the transmitting end is speeded up;
  • the received service data is an OTU3 stuff frame and an OTU3 e2 frame
  • the OTU3 stuff frame is an OTU frame obtained by speeding up the OTU3 frame
  • the frame rate of the OTU3 stuff frame is 57/55 times of the frame rate of the OTU3 frame.
  • Step 42 The receiving end performs digital signal processing (DSP) and clock data recovery (CDR) processing on the service data by using the clock signal of the single frequency point;
  • DSP digital signal processing
  • CDR clock data recovery
  • the clock signal of the single frequency point may specifically be a clock signal for processing the OTU3 e2 frame.
  • a single local crystal oscillator will be used, and the clock signal generated by the local crystal oscillator is supplied to Digital Signal Processing (DSP) and Clock Data Recovery (CDR) processing device.
  • DSP Digital Signal Processing
  • CDR Clock Data Recovery
  • the DSP and the CDR processing device can start working based on the clock of the single frequency point, and can quickly complete the service clock and data recovery of the wavelength division line without requiring software to perform the service rate switching configuration.
  • the prior art there are two local crystal oscillators at the receiving end, which respectively correspond to the OTU3 service and the OTU3e2 service, and there is a selection module between the local crystal oscillator and the DSP and the CDR processing device. It is used to select one of the clock signals provided by the two local crystal oscillators according to the type of service judged by the software, and then provide the selected clock signal to the DSP and the CDR processing device.
  • Step 43 The receiving end determines the type of the received service data.
  • the frame transmitted on the 40G WDM line may be an OTU3 stuff frame or an OTU3e2 frame.
  • the OTU3 stuff frame has a different format from the pre-encapsulated OTU3 frame. Since the OTU3 frame and the OTU3e2 frame have the same format, Then the OTU3 stuff frame and the OTU3e2 frame have different frame formats, so it is possible to determine which service type is based on the frame format. For example, the length of the OTU3 stuff frame is different from the length of the OTU3e2 frame.
  • the judging process can be implemented independently by hardware.
  • the VCO interface configuration is not required, and software participation is not required.
  • the service detection and type judging processing are completed quickly, the service opening time is greatly shortened, and the existing scheme hardware and software design coupling is eliminated.
  • the software patrol switching rate attempt mode is used to obtain the real service rate, and the service stabilization time is long, which often affects the service recovery performance and causes the switching time to exceed the standard.
  • the board software needs to participate in the service rate switching configuration, hardware design and software. There is a strong coupling relationship between the designs, and the system design is difficult.
  • Step 44 The receiving end performs decapsulation and framing processing on the speed-up service data processed by the clock signal with a single frequency point;
  • the received service data is an OTU3 stuff frame
  • the DSP and the CDR processed OTU3 stuff frame are decapsulated and framed to obtain an OTU3 frame, and the payload portion of the OTU3 stuff frame shown in FIG. 2 can be extracted.
  • Part of the data constitutes an OTU3 frame.
  • Step 45 The receiving end performs framing processing on the non-speed-up service data processed by the clock signal with a single frequency point;
  • the receiving end may also obtain an OTU3e2 frame from the DSP and the CDR processed OTU3e2 frame.
  • Step 46 The receiving end selects, according to the type of the service data obtained by the judgment, the data after the output decapsulation and the frame processing or the data after the frame processing;
  • the service type is an OTU3 stuff frame
  • the OTU3 frame after the decapsulation and the frame processing is outputted
  • the service type is determined to be an OTU3e2 frame
  • the OTU3e2 frame after the fixed frame processing is selected.
  • subsequent processing may be performed, for example, the method may further include: The receiving end performs subsequent processing on the data selected and output according to the type of the service data obtained by the judgment.
  • the receiving end performs subsequent processing on the OTU3 frame or the OTU3e2 frame according to the determined service type.
  • the determined service type may be subsequently processed.
  • the subsequent processing is, for example, obtaining communication overhead, performing error statistics, and the like, and the specific content may be processed after the OTU frame type is determined in the prior art.
  • the OTU3 frame is encapsulated into an OTU3 stuff frame, and the frame rate of the OTU3 stuff frame is 57/55 times that of the OTU3 frame.
  • the frame rate of the OTU3 stuff frame is almost the same as the frame rate of the OTU3e2 frame.
  • the frame rate of the 40G WDM service is unified.
  • the same local crystal oscillator can be used to increase the clock signal for the received 40G WDM service frame, which avoids the problem caused by the local crystal oscillator with two frequency points in the prior art.
  • the cost of the 40G wave splitter card reduces the difficulty of layout and reduces the difficulty of handling hardware and software.
  • FIG. 6 is a schematic structural diagram of an embodiment of a transmitting device according to the present invention, which includes an encapsulating module 61 and a sending module 62.
  • the encapsulating module 61 is configured to speed up at least one of the OTU frames having different frame rates, so that the receiving end can adopt The clock signal of the same frequency point processes the OTU frame;
  • the sending module 62 is configured to send the accelerated OTU frame with different frame rate on the wavelength division line.
  • the OTU frames with different frame rates are: an OTU3 frame and an OTU3e2 frame, where the encapsulation module is specifically configured to: speed up the OTU3 frame, so that the clock signal pair processed by the OTU3e2 frame can be adopted at the receiving end.
  • the speed-up OTU3 frame is processed.
  • the encapsulating module is specifically configured to: encapsulate the OTU3 frame into an OTU3 stuff frame, where the frame rate of the OTU3 stuff frame is 57/55 times the frame rate of the OTU3 frame.
  • the encapsulating module is specifically configured to: insert a padding bit between a first bit part and a second bit part of the OTU3 frame, where the number of bits of the first bit part is 28*64, the second The number of bits of the bit portion is 27*64, and the number of bits of the padding bit is 64.
  • the OTU3 stuff frame obtained by the encapsulating module is self-framing, and the structure of the OTU3 stuff frame is different from the structure of the OTU3 frame.
  • the encapsulating module is specifically configured to: enter an OTU frame with different frame rates.
  • the line speed is increased so that the OTU frame can be processed at the receiving end by using a clock signal of the same frequency point.
  • the OTU3 frame is encapsulated into an OTU3 stuff frame, and the frame rate of the OTU3 stuff frame is 57/55 times that of the OTU3 frame.
  • the frame rate of the OTU3 stuff frame is almost the same as the frame rate of the OTU3e2 frame.
  • the frame rate of the 40G WDM service is unified.
  • the same local crystal oscillator can be used to increase the clock signal for the received 40G WDM service frame, which avoids the problem caused by the local crystal oscillator with two frequency points in the prior art.
  • the cost of the 40G wave splitter card reduces the difficulty of layout.
  • FIG. 7 is a schematic structural diagram of an embodiment of a receiving device according to the present invention, including a local crystal oscillator 71, a processing module 72, a determining module 73, a decapsulation and framing module 74, a framing module 75, and a selecting module 76.
  • the local crystal oscillator 71 is configured to receive
  • the different service data provides a clock signal of a single frequency point, and at least one of the service data is obtained after the speed is increased by the transmitting end, and the service data obtained after the speed increasing processing is an OTU frame obtained by self-framing.
  • the processing module 72 is configured to perform DSP and CDR processing on the service data by using the clock signal of the single frequency point;
  • the determining module 73 is configured to adopt The hardware determines the type of the received service data according to the frame format;
  • the decapsulation and framing module 74 is configured to perform decapsulation and framing processing on the speed-up service data processed by the clock signal using a single frequency point; Performing a framing process on the non-speed-up service data processed by the clock signal using a single frequency point;
  • the selecting module 76 is configured to Data type determination module determines that the service data obtained, selecting the output data and the decapsulation process or a given frame framing processed data.
  • the device may further include a module for performing subsequent processing on the selected output data according to the type of the service data obtained by the judgment.
  • the frequency of the local crystal oscillator is the same as the frequency of the clock signal processed for the OTU3e2 frame.
  • the OTU3 frame is encapsulated into an OTU3 stuff frame, and the frame rate of the OTU3 stuff frame is 57/55 times that of the OTU3 frame.
  • the frame rate of the OTU3 stuff frame is almost the same as the frame rate of the OTU3e2 frame.
  • the frame rate of the 40G WDM service is unified.
  • the same local crystal oscillator can be used to increase the clock signal for the received 40G WDM service frame, which avoids the problem caused by the local crystal oscillator with two frequency points in the prior art.
  • the cost of the 40G wave splitter card reduces the difficulty of layout and reduces the difficulty of handling hardware and software.
  • FIG. 8 is a schematic structural diagram of an embodiment of an OTN system according to the present invention, where the system includes a transmission device
  • the device 81 and the receiving device 82, the transmitting device 81 can be specifically as shown in FIG. 6, and the receiving device 82 can be specifically as shown in FIG.
  • the at least one of the OTU frames of different frame rates is extracted, so that the receiving end can process the received OTU frame by using the clock signal of the same frequency point, so that the frequency of the receiving end can be normalized, then Only one local crystal oscillator needs to be set at the receiving end to avoid the problems caused by setting multiple local crystal oscillators in the prior art, reducing the cost of the wavelength division line card, reducing the layout difficulty, and reducing the difficulty of processing hardware and software.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Time-Division Multiplex Systems (AREA)

Description

统一帧速率的方法和设备
技术领域 本发明涉及光通信技术领域， 尤其涉及一种统一帧速率的方法和设 备。 背景技术
现有对 40G 波分线路定义的两种业务类型的光转换单元 （Optical Transform Unit , OTU ) 分别为 0TU3 和 OTU3e2 , 它们的速率分别是 43.01841356Gbps和 44.58335558Gbps, 两种业务速率差异大。 在接收端， 需要分别设置频点与 OTU3 和 OTU3e2对应的本地晶振， 即压控振荡器 ( Voltage-Controlled Oscillator, VCO ) , 波分网络需要超高频率的采样时 钟， 需要与波分侧业务速率存在一定的比例关系， 由本地晶振产生。 由于 现有 40G波分业务速率存在多种频点，例如上述的 0TU3和 OTU3e2存在 两个频点， 这样就需要多个高频点的本地晶振提供多种高频采样时钟信 号，这样会增加 40G波分线卡方案成本、布局难度和软硬件配合处理难度。 发明内容
本发明实施例提供了一种统一帧速率的方法和设备， 可以将现有的波 分业务的帧速率统一到几乎相同的帧速率， 消除现有由于帧速率不同引起 的接收端的频点不统一问题， 进而降低实现难度和成本。
本发明实施例提供了一种统一帧速率的方法， 包括：
对具有不同帧速率的 0TU帧中的至少一种进行提速， 使得在接收端 能够采用同一频点的时钟信号对 0TU帧进行处理；
在波分线路上发送经过提速后的所述具有不同帧速率的 0TU帧。 本发明实施例提供了一种统一帧速率的方法， 包括：
为接收的不同的业务数据提供单一频点的时钟信号， 所述业务数据中 的至少一种是在发送端经过提速后得到的；
采用所述单一频点的时钟信号， 对所述业务数据进行 DSP和 CDR处 理；
判断接收的业务数据的类型；
对采用单一频点的时钟信号处理后的经过提速的业务数据进行解封 装和定帧处理；
对采用单一频点的时钟信号处理后的非提速的业务数据进行定帧处 理；
根据判断得到的业务数据的类型， 选择输出解封装和定帧处理后的数 据或者定帧处理后的数据。
本发明实施例提供了一种发送设备， 包括：
封装模块， 用于对具有不同帧速率的 OTU帧中的至少一种进行提速， 使得在接收端能够采用同一频点的时钟信号对 OTU帧进行处理；
发送模块， 用于在波分线路上发送经过提速后的所述具有不同帧速率 的 OTU帧。
本发明实施例提供了一种接收设备， 包括：
本地晶振， 用于为接收的不同的业务数据提供单一频点的时钟信号， 所述业务数据中的至少一种是在发送端经过提速后得到的， 提速处理后得 到的业务数据是采用自成帧的方式得到的 OTU帧，且提速后的 OTU帧与 提速前的 OTU帧具有不同的结构；
处理模块， 用于采用所述单一频点的时钟信号， 对所述业务数据进行 DSP和 CDR处理；
判断模块， 用于采用硬件根据帧格式判断接收的业务数据的类型； 解封装和定帧模块， 用于对采用单一频点的时钟信号处理后的经过提 速的业务数据进行解封装和定帧处理；
定帧模块， 用于对采用单一频点的时钟信号处理后的非提速的业务数 据进行定帧处理；
选择模块， 用于根据判断模块判断得到的业务数据的类型， 选择输出 解封装和定帧处理后的数据或者定帧处理后的数据。
由上述技术方案可知， 本发明实施例通过将不同帧速率的 OTU帧中 的至少一种进行提速， 使得接收端能够采用同一频点的时钟信号对接收的 OTU帧进行处理， 可以实现在接收端的频点归一， 那么在接收端只需要设 置一个本地晶振， 避免现有技术中需要分别设置多个本地晶振引起的问 题， 降低波分线卡的成本、 降低布局难度。 附图说明
为了更清楚地说明本发明实施例中的技术方案， 下面将对实施例描述 中所需要使用的附图作一简单地介绍， 显而易见地， 下面描述中的附图是 本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳 动性的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明统一帧速率的方法一实施例的流程示意图；
图 2为本发明中的 OTU3 stuff帧的结构示意图；
图 3为本发明中发送端的结构示意图；
图 4为本发明统一帧速率的方法另一实施例的流程示意图；
图 5为本发明中接收端的结构示意图；
图 6为本发明发送设备一实施例的结构示意图；
图 7为本发明接收设备一实施例的结构示意图；
图 8为本发明 OTN系统一实施例的结构示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本 发明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描 述， 显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做出创造性劳动前提 下所获得的所有其他实施例， 都属于本发明保护的范围。
光网络通信中， 一端的客户端可以通过光纤将数据发送给另一端的客 户端。 在该光网络通信中可以分为客户侧和波分侧， 客户侧包括用于产生 客户数据的设备， 例如终端设备， 波分侧包括将客户数据封装成 OTN帧 的设备， 以及传输 OTN帧的设备、 光纤等， 因此， 两个客户侧可以通过 中间的波分侧实现光网络通信。
图 1为本发明统一帧速率的方法一实施例的流程示意图， 包括： 步骤 11 :发送端对具有不同帧速率的 OTU帧中的至少一种进行提速， 使得在接收端能够采用同一频点的时钟信号对 OTU帧进行处理； 例如， 发送端要发送的帧为： OTU3帧和 OTU3e2帧， 由于这两种帧 的帧速率相差较大， 现有技术中需要在接收端需要设置两个 VCO。
而本实施例中， 可以在发送端对 OTU3 帧进行提速， 使得提速后的 OTU3帧的帧速率与 OTU3e2的帧速率几乎一致， 这样在接收端就可以设 置一个 VCO对 OTU3e2帧和提速后的 OTU3帧进行处理。
具体的， 对 OTU3帧进行提速后的帧可以称为 OTU3 stuff 帧， 所述 OTU3 stuff帧的帧速率为 OTU3帧的帧速率的 57/55倍。
其中， 由于 OTU3帧的帧速率为 43.01841356Gbps, 与 OTU3e2帧的 帧速率 44.58335558Gbps相差较大。 而 OTU3 stuff帧的帧速率为 OTU3帧 的帧速率的 57/55倍， 那么 OTU3 stuff帧的帧速率 44.5827195 lGbps, 与 OTU3e2帧的帧速率接近， 近乎一致。 因此， 在接收端可以采用同一个本 地晶振为 OTU3 stuff帧和 OTU3e2帧提供时钟信号， 从而达到速率统一， 频点归一 4匕。
其中， OTU3 stuff 帧为自成帧， 自成帧是指具有确定的格式的帧， 例如， 具有确定的长度、 各组成部分具有确定的长度和位置。 进一步的， 该 OTU3 stuff帧的格式可以与 OTU3帧的结构不同，而按照现有协议 OTU3 帧和 OTU3e2帧具有相同的帧格式， 这样在接收端可以直接根据帧格式确 定出接收的是 OTU3 stuff帧还是 OTU3e2帧。
进一步地， 在封装时， 为了降低抖动问题， 可以将填充比特间插到
OTU3业务数据之间， 例如， 参见图 2, OTU3 stuff 帧的结构可以如图 2 所示， 其中的填充部分（stuff ) 用于塞入填充比特， 净荷部分（payload ) 用于封装 OTU3业务数据， 图 2的单位为 Bit。 经过图 2所示的封装后， OTU3 stuff帧的帧速率与 OTU3帧的帧速率之比为 57:55。 另外， 也可以 对 OTU3帧和 OTU3e2帧均进行提速处理， 使得提速处理后的帧在接收端 能够被同一个频点的时钟信号处理。
步骤 12:发送端在波分线路上发送经过提速后的所述具有不同帧速率 的 OTU帧。
例如， 参见图 3 , 在发送端， 将 OTU3业务封装成 OTU3 stuff帧后在 40G波分线路上发送， 对于 OTU3e2业务， 直接把 OTU3e2帧在 40G波分 线路上发送。 OTU3 stuff帧和 OTU3e2帧的帧速率几乎相同。
可以理解的是， 本发明实施例并不限于 OTU3帧和 OTU3e2帧， 也可 以应用到其它速率级别的 OTN 帧上， 使得同一速率级别的不同类型的 OTU帧具有几乎相同的速率。
本实施例通过将 OTU3帧封装成 OTU3 stuff帧， OTU3 stuff帧的帧速 率是 OTU3帧的帧速率的 57/55倍， 可以使得 OTU3 stuff 帧的帧速率与 OTU3e2帧的帧速率几乎相同， 实现对 40G波分业务的帧速率的统一， 进 而在接收端可以采用同一个本地晶振为接收的 40G 波分业务帧提高时钟 信号， 避免现有技术中采用两个频点的本地晶振引起的问题， 降低 40G波 分线卡的成本、 降低布局难度。
图 4为本发明统一帧速率的方法另一实施例的流程示意图， 包括： 包 括：
步骤 41： 接收端为接收的不同的业务数据提供单一频点的时钟信号， 所述业务数据中的至少一种是在发送端经过提速后得到的；
例如，接收的业务数据为 OTU3 stuff帧和 OTU3 e2帧，所述 OTU3 stuff 帧为对 OTU3 帧提速后得到的 OTU帧， 所述 OTU3 stuff 帧的帧速率为 OTU3帧的帧速率的 57/55倍。
步骤 42: 接收端采用所述单一频点的时钟信号，对所述业务数据进行 数字信号处理（ Digital Signal Processing, DSP )和时钟数据恢复（ Clock Data Recovery, CDR ) 处理；
在发送端， 将 OTU3 帧封装成 OTU3 stuff 帧后， OTU3 stuff 帧和 OTU3e2帧的帧速率几乎相同， 因此在接收端可以采用单一频点的时钟信 号。该单一频点的时钟信号可以具体为对 OTU3 e2帧进行处理的时钟信号。
参见图 5 , 在接收端由于速率统一， 将采用单一的本地晶振， 该本地 晶振产生的时钟信号提供给数字信号处理（ Digital Signal Processing, DSP ) 和时钟数据恢复（ Clock Data Recovery, CDR )处理装置， DSP和 CDR处 理装置可以基于该单个频点的时钟开始工作， 在不需要软件做业务速率切 换配置情况下就可以快速完成波分线路的业务时钟、 数据恢复。
而现有技术中， 接收端存在两个本地晶振， 分别对应 OTU3 业务和 OTU3e2业务，在本地晶振与 DSP和 CDR处理装置之间还存在选择模块， 用于根据软件判断出的业务类型在两个本地晶振提供的时钟信号中选择 一个， 再将选择的时钟信号提供给 DSP和 CDR处理装置。
步骤 43: 接收端判断接收的业务数据的类型。
其中， 由于 40G 波分线路上传输的帧可能为 OTU3 stuff 帧或者 OTU3e2帧， 且参见图 2, OTU3 stuff帧与封装前的 OTU3帧具有不同的 格式， 由于 OTU3帧和 OTU3e2帧具有相同的格式， 那么 OTU3 stuff帧和 OTU3e2帧具有不同的帧格式，因此可以根据帧格式判断是哪种业务类型。 例如， OTU3 stuff帧的长度与 OTU3e2帧的长度不同。
该判断过程可以由硬件独立实现， 不需要 VCO接口配置， 也就不需 要软件参与，业务检测和类型判断处理快速完成，大大缩短业务开通时间， 消除现有方案硬件、 软件设计耦合。 而现有技术中， 采用软件轮巡切换速 率尝试方式来获得真实业务速率， 业务稳定时间长， 往往影响业务恢复性 能和导致倒换时间超标， 需要单板软件参与业务速率切换配置， 硬件设计 和软件设计之间存在强耦合关系， 系统设计难度大。
步骤 44:接收端对采用单一频点的时钟信号处理后的经过提速的业务 数据进行解封装和定帧处理；
例如， 在接收的业务数据为 OTU3 stuff帧时， 将 DSP和 CDR处理后 的 OTU3 stuff帧解封装和定帧得到 OTU3帧，可以提取出图 2所示的 OTU3 stuff帧的净荷部分， 净荷部分的数据组成 OTU3帧。
步骤 45:接收端对采用单一频点的时钟信号处理后的非提速的业务数 据进行定帧处理；
例如，接收端在接收的业务数据为 OTU3e2时，也可以从 DSP和 CDR 处理后的 OTU3e2帧中定帧得到 OTU3e2帧；
步骤 46: 接收端根据判断得到的业务数据的类型， 选择输出解封装和 定帧处理后的处理或者定帧处理后的数据；
例如， 当判断出业务类型为 OTU3 stuff帧后， 则选择输出解封装和定 帧处理后的 OTU3帧， 当判断出业务类型为 OTU3e2帧后， 则选择输出定 帧处理后的 OTU3e2帧。
进一步的， 在确定出业务数据类型后， 可以进行后续处理， 例如还可 以包括： 接收端根据判断得到的业务数据的类型， 对选择输出的数据进行后续 处理。
例如， 接收端根据确定的业务类型对 OTU3帧或 OTU3e2帧进行后续 处理。
其中， 与现有技术类似， 现有技术中完成 OTU3帧和 OTU3e2帧的定 帧处理后， 可以对确定的业务类型进行后续处理。 后续处理例如为获取通 信开销、 进行误码统计等， 具体内容可以与现有技术在确定出 OTU帧类 型后进行的处理。
本实施例通过将 OTU3帧封装成 OTU3 stuff帧， OTU3 stuff帧的帧速 率是 OTU3帧的帧速率的 57/55倍， 可以使得 OTU3 stuff 帧的帧速率与 OTU3e2帧的帧速率几乎相同， 实现对 40G波分业务的帧速率的统一， 进 而在接收端可以采用同一个本地晶振为接收的 40G 波分业务帧提高时钟 信号， 避免现有技术中采用两个频点的本地晶振引起的问题， 降低 40G波 分线卡的成本、 降低布局难度和降低软硬件配合处理难度。
图 6为本发明发送设备一实施例的结构示意图， 包括封装模块 61和 发送模块 62;封装模块 61用于对具有不同帧速率的 OTU帧中的至少一种 进行提速， 使得在接收端能够采用同一频点的时钟信号对 OTU帧进行处 理； 发送模块 62用于在波分线路上发送经过提速后的所述具有不同帧速 率的 OTU帧。
可选的， 所述具有不同帧速率的 OTU帧为： OTU3帧和 OTU3e2帧， 所述封装模块具体用于： 对 OTU3帧进行提速， 使得在接收端能够采用对 OTU3e2帧进行处理的时钟信号对提速后的 OTU3帧进行处理。
可选的， 所述封装模块具体用于： 将 OTU3帧封装成 OTU3 stuff帧， 所述 OTU3 stuff帧的帧速率为 OTU3帧的帧速率的 57/55倍。
可选的， 所述封装模块具体用于： 在 OTU3帧的第一比特部分和第二 比特部分之间塞入填充比特， 所述第一比特部分的比特数为 28*64, 所述 第二比特部分的比特数为 27*64, 所述填充比特的比特数为 64。
可选的，所述封装模块得到的所述 OTU3 stuff帧为自成帧，所述 OTU3 stuff帧的结构与 OTU3帧的结构不同。
可选的， 所述封装模块具体用于： 对具有不同帧速率的 OTU帧都进 行提速， 使得在接收端能够采用同一频点的时钟信号对 OTU帧进行处理。 本实施例通过将 OTU3帧封装成 OTU3 stuff帧， OTU3 stuff帧的帧速 率是 OTU3帧的帧速率的 57/55倍， 可以使得 OTU3 stuff 帧的帧速率与 OTU3e2帧的帧速率几乎相同， 实现对 40G波分业务的帧速率的统一， 进 而在接收端可以采用同一个本地晶振为接收的 40G 波分业务帧提高时钟 信号， 避免现有技术中采用两个频点的本地晶振引起的问题， 降低 40G波 分线卡的成本、 降低布局难度。
图 7为本发明接收设备一实施例的结构示意图， 包括本地晶振 71、处 理模块 72、 判断模块 73和解封装和定帧模块 74、 定帧模块 75、 选择模块 76; 本地晶振 71用于为接收的不同的业务数据提供单一频点的时钟信号， 所述业务数据中的至少一种是在发送端经过提速后得到的， 提速处理后得 到的业务数据是采用自成帧的方式得到的 OTU帧，且提速后的 OTU帧与 提速前的 OTU帧具有不同的结构； 处理模块 72用于采用所述单一频点的 时钟信号， 对所述业务数据进行 DSP和 CDR处理； 判断模块 73用于采 用硬件根据帧格式判断接收的业务数据的类型； 解封装和定帧模块 74用 于对采用单一频点的时钟信号处理后的经过提速的业务数据进行解封装 和定帧处理； 定帧模块 75 用于对采用单一频点的时钟信号处理后的非提 速的业务数据进行定帧处理； 选择模块 76用于根据判断模块判断得到的 业务数据的类型， 选择输出解封装和定帧处理后的数据或者定帧处理后的 数据。进一步的，该设备还可以包括用于根据判断得到的业务数据的类型， 对选择输出的数据进行后续处理的模块。
所述本地晶振的频点与对 OTU3e2 帧进行处理的时钟信号的频点相 同。
本实施例通过将 OTU3帧封装成 OTU3 stuff帧， OTU3 stuff帧的帧速 率是 OTU3帧的帧速率的 57/55倍， 可以使得 OTU3 stuff 帧的帧速率与 OTU3e2帧的帧速率几乎相同， 实现对 40G波分业务的帧速率的统一， 进 而在接收端可以采用同一个本地晶振为接收的 40G 波分业务帧提高时钟 信号， 避免现有技术中采用两个频点的本地晶振引起的问题， 降低 40G波 分线卡的成本、 降低布局难度和降低软硬件配合处理难度。
图 8为本发明 OTN系统一实施例的结构示意图， 该系统包括发送设 备 81和接收设备 82, 发送设备 81可以具体如图 6所示， 接收设备 82可 以具体如图 7所示。
本实施例通过将不同帧速率的 OTU帧中的至少一种进行提取处理， 使得接收端能够采用同一频点的时钟信号对接收的 OTU帧进行处理， 可 以实现在接收端的频点归一， 那么在接收端只需要设置一个本地晶振， 避 免现有技术中需要分别设置多个本地晶振引起的问题， 降低波分线卡的成 本、 降低布局难度和降低软硬件配合处理难度。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机 可读取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程 序代码的介质。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对 其限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通 技术人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修 改， 或者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不 使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims

权 利 要 求 书
1、 一种统一帧速率的方法， 其特征在于， 包括：
对具有不同帧速率的光转换单元 OTU帧中的至少一种进行提速 ,使得 在接收端能够采用同一频点的时钟信号对 OTU帧进行处理；
在波分线路上发送经过提速后的所述具有不同帧速率的 OTU帧。
2、 根据权利要求 1 所述的方法， 其特征在于， 所述具有不同帧速率 的 OTU帧为： OTU3帧和 OTU3e2帧， 所述对具有不同帧速率的 OTU帧 中的至少一种进行提速， 包括：
对 OTU3帧进行提速， 使得在接收端能够采用对 OTU3e2帧进行处理 的时钟信号对提速后的 OTU3帧进行处理。
3、 根据权利要求 2所述的方法， 其特征在于， 所述对 OTU3帧进行 提速， 包括：
将 OTU3帧封装成 OTU3 stuff帧，所述 OTU3 stuff帧的帧速率为 OTU3 帧的帧速率的 57/55倍。
4、 根据权利要求 3所述的方法， 其特征在于， 所述将 OTU3帧封装 成 OTU3 stuff帧， 包括：
在 OTU3帧的第一比特部分和第二比特部分之间塞入填充比特， 所述 第一比特部分的比特数为 28*64, 所述第二比特部分的比特数为 27*64, 所述填充比特的比特数为 64。
5、 根据权利要求 3所述的方法， 其特征在于， 所述 OTU3 stuff帧为 自成帧， 所述 OTU3 stuff帧的结构与 OTU3帧的结构不同。
6、 根据权利要求 1 所述的方法， 其特征在于， 所述对具有不同帧速 率的 OTU帧中的至少一种进行提速， 使得在接收端能够采用同一频点的 时钟信号对 OTU帧进行处理， 包括：
对具有不同帧速率的 OTU帧都进行提速， 使得在接收端能够采用同 一频点的时钟信号对 OTU帧进行处理。
7、 一种统一帧速率的方法， 其特征在于， 包括：
为接收的不同的业务数据提供单一频点的时钟信号， 所述业务数据中 的至少一种是在发送端经过提速后得到的；
采用所述单一频点的时钟信号， 对所述业务数据进行数字信号处理 DSP和时钟数据恢复 CDR处理；
判断接收的业务数据的类型；
对采用单一频点的时钟信号处理后的经过提速的业务数据进行解封 装和定帧处理；
对采用单一频点的时钟信号处理后的非提速的业务数据进行定帧处 理；
根据判断得到的业务数据的类型， 选择输出解封装和定帧处理后的数 据或者定帧处理后的数据。
8、 根据权利要求 7所述的方法， 其特征在于， 所述在发送端经过提 速处理后得到的业务数据是采用自成帧的方式得到的 OTU帧， 且提速后 的 OTU帧与提速前的 OTU帧具有不同的结构， 所述判断接收的业务数据 的类型， 包括：
采用硬件模块， 根据帧格式判断接收的业务数据的类型。
9、 根据权利要求 7或 8所述的方法， 其特征在于， 所述业务数据为： OTU3 stuff帧和 OTU3 e2帧， 所述 OTU3 stuff帧为对 OTU3帧提速后得到 的 OTU帧， 所述 OTU3 stuff帧的帧速率为 OTU3帧的帧速率的 57/55倍。
10、 一种发送设备， 其特征在于， 包括：
封装模块，用于对具有不同帧速率的光转换单元 OTU帧中的至少一种 进行提速， 使得在接收端能够采用同一频点的时钟信号对 OTU帧进行处 理；
发送模块， 用于在波分线路上发送经过提速后的所述具有不同帧速率 的 OTU帧。
11、 根据权利要求 10所述的设备， 其特征在于， 所述具有不同帧速 率的 OTU帧为： OTU3帧和 OTU3e2帧，所述封装模块具体用于：对 OTU3 帧进行提速， 使得在接收端能够采用对 OTU3e2帧进行处理的时钟信号对 提速后的 OTU3帧进行处理。
12、 根据权利要求 11 所述的设备， 其特征在于， 所述封装模块具体 用于： 将 OTU3帧封装成 OTU3 stuff帧， 所述 OTU3 stuff帧的帧速率为 OTU3帧的帧速率的 57/55倍， 且所述 OTU3 stuff帧的结构与 OTU3帧的 结构不同。
13、 根据权利要求 10所述的设备， 其特征在于， 所述封装模块具体 用于： 对具有不同帧速率的 OTU帧都进行提速， 使得在接收端能够采用 同一频点的时钟信号对 OTU帧进行处理。
14、 一种接收设备， 其特征在于， 包括：
本地晶振， 用于为接收的不同的业务数据提供单一频点的时钟信号， 所述业务数据中的至少一种是在发送端经过提速后得到的， 提速处理后得 到的业务数据是采用自成帧的方式得到的光转换单元 OTU帧，且提速后的 OTU帧与提速前的 OTU帧具有不同的结构；
处理模块， 用于采用所述单一频点的时钟信号， 对所述业务数据进行 数字信号处理 DSP和时钟数据恢复 CDR处理；
判断模块， 用于采用硬件根据帧格式判断接收的业务数据的类型； 解封装和定帧模块， 用于对采用单一频点的时钟信号处理后的经过提 速的业务数据进行解封装和定帧处理；
定帧模块， 用于对采用单一频点的时钟信号处理后的非提速的业务数 据进行定帧处理；
选择模块， 用于根据判断模块判断得到的业务数据的类型， 选择输出 解封装和定帧处理后的数据或者定帧处理后的数据。
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