WO2008022578A1 - Procédé et dispositif pour transporter un service hiérarchisé numérique synchrone dans un réseau optique passif - Google Patents

Procédé et dispositif pour transporter un service hiérarchisé numérique synchrone dans un réseau optique passif Download PDF

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Publication number
WO2008022578A1
WO2008022578A1 PCT/CN2007/070395 CN2007070395W WO2008022578A1 WO 2008022578 A1 WO2008022578 A1 WO 2008022578A1 CN 2007070395 W CN2007070395 W CN 2007070395W WO 2008022578 A1 WO2008022578 A1 WO 2008022578A1
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WIPO (PCT)
Prior art keywords
optical network
passive optical
service
synchronous digital
data frame
Prior art date
Application number
PCT/CN2007/070395
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English (en)
French (fr)
Inventor
Frank Effenberger
Jun Zhao
Wei Huang
Wei Lin
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to AU2007287969A priority Critical patent/AU2007287969B2/en
Priority to BRPI0707114-0A priority patent/BRPI0707114B1/pt
Priority to CN2007800002626A priority patent/CN101313507B/zh
Publication of WO2008022578A1 publication Critical patent/WO2008022578A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/16Time-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
    • H04J3/1694Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/16Time-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
    • H04J3/1605Fixed allocated frame structures
    • H04J3/1611Synchronous digital hierarchy [SDH] or SONET
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q11/0067Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q2011/0084Quality of service aspects

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a method and apparatus for transmitting a synchronous digital system service in a passive optical network.
  • Passive Optical Network is a point-to-multipoint fiber access network consisting of optical line terminals (OLT: Optical Line Terminal) on the office side and optical network units (ONU: Optical on the user side). Network Unit ) / Optical Network Terminal (ONT: Optical Network Terminal) and Optical Distribution Network (ODN: Optical Distribution Network).
  • OLT optical line terminal
  • OTN Optical Network Terminal
  • ODN Optical Distribution Network
  • TDM time division multiplexing
  • This method encapsulates the TDM service data with a variable length GEM frame, and the transmission is limited. Between the OLT and the ONT, and because the clock recovery is adaptive, it is difficult to satisfy the control of jitter and drift.
  • TDM over Ethernet mode of transmitting TDM services over Ethernet (Ethernet) frames; this method requires an Ethernet frame-based encoding format, requires a large transmission bandwidth, and increases the cost of the ONU.
  • the first method is to use the modified SDH virtual container (VC: Virtual Container) to carry TDM services; the basic method is to modify the frame structure of SDH virtual containers VC11 and VC12, Tl
  • the TDM service of the El rate is mapped to the frame structure of the changed VC11 and VC12, and each block of the modified VC11 and VC12 frames is encapsulated into a GEM frame, and the TDM service is transmitted through the GEM frame.
  • the method needs to change the mapped service frame structure, and cannot directly transmit the SDH frame to the terminal ONT.
  • the structure of the TDM service cannot be transmitted due to non-standard structure; and since the virtual container only provides positive and negative adjustment padding bits, Therefore, byte adjustment cannot be implemented;
  • the second method is to encapsulate various types of TDM services into the virtual branch of SDH by ignoring the payload form of the data structure, or by using the payload form of the locked data structure, or by using a pointer to indicate the floating load form of the data structure.
  • VT Virtual Tributary
  • the VT is encapsulated into the Ethernet frame; then the Ethernet frame is encapsulated into the payload of the GEM frame, that is, the TDM is carried in the GPON network through the "Ethernet over GEM" mode.
  • the method does not need to modify the existing standards, the TDM service data needs to be mapped through VT, Ethernet frames, and GEM frames three times. The implementation is complicated, and the protocol overhead is too large, which requires a large bandwidth.
  • the invention provides a method and a device for carrying and receiving a synchronous digital system service in a passive optical network, so that the frame structure of the SDH tributary unit of the existing standard does not need to be modified, and the device can be directly integrated with the SDH network, and can be simplified. Realize the extraction of SDH business data.
  • the present invention also provides a method for mapping a data frame of a synchronous digital system to a data frame of a passive optical network to implement transmission of a synchronous digital system service in a passive optical network.
  • the invention provides a method for carrying a synchronous digital system service in a passive optical network, comprising: encapsulating a branch unit loaded with synchronous digital system service data into a passive optical network encapsulated data frame;
  • the present invention also provides a method for receiving a synchronous digital system service in a passive optical network, comprising: receiving a passive optical network encapsulated data frame;
  • the present invention also provides a synchronous digital system service sending apparatus, including:
  • a packaging module configured to encapsulate a branch unit loaded with synchronous digital system service data into a passive optical network encapsulated data frame
  • a sending module configured to send a passive optical network encapsulated data frame generated by the encapsulating module.
  • the present invention also provides a synchronous digital system service receiving apparatus, including:
  • a receiving module configured to receive a passive optical network encapsulated data frame
  • a first decapsulation module configured to remove a synchronous digital system tributary unit loaded in a load portion thereof from a passive optical network package data frame received by the receiving module.
  • the present invention also provides a method for mapping a data frame of a synchronous digital system to a data frame of a passive optical network, including:
  • the length of the data frame header of the passive optical network is used to identify the type of tributary unit of the payload portion of the passive optical network data frame.
  • the invention realizes the transmission of the SDH service in the GPON by directly mapping the tributary unit in the SDH to the GEM, and can directly integrate with the SDH network by using the standard SDH tributary unit frame structure, simply Implement bearer and extraction of SDH service data. .
  • the invention will now be further described in detail by the specific embodiments and drawings.
  • FIG. 1 is a schematic flowchart of a method for carrying an SDH service in a GPON according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic diagram of a TU mapping to a GEM frame according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of a TTU service data loading into a TU path according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic structural diagram of a TU-11 according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic structural diagram of a TU-12 according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic structural view of a TU-2 according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic structural view of a TU-3 according to Embodiment 1 of the present invention.
  • FIG. 8 is a schematic flowchart of a method for receiving an SDH service in a GPON according to Embodiment 2 of the present invention
  • FIG. 9 is a schematic flowchart of a method for receiving an SDH service in a GPON according to Embodiment 3 of the present invention
  • FIG. 10 is a schematic structural diagram of an SDH service sending apparatus according to Embodiment 4 of the present invention
  • FIG. 11 is a schematic structural diagram of an apparatus for receiving an SDH service according to Embodiment 5 of the present invention.
  • FIG. 12 is a schematic structural diagram of an SDH service receiving apparatus according to Embodiment 6 of the present invention.
  • the embodiment of the present invention provides a method for carrying and receiving an SDH service in a passive optical network, and directly mapping an SDH tributary unit (TU: Tributary unit) carrying the SDH service to a load of the GEM, and implementing the SDH service in the GPON.
  • TU Tributary unit
  • TDM services of different speeds can be loaded into corresponding types of TUs according to the encapsulation process specified by the existing SDH.
  • Each type of TU is loaded into the GEM frame and sent according to its framing period, and stripped at the receiving end by reverse process.
  • the encapsulation forwards or extracts the SDH service data, and the receiving end can determine the TU type carried by the PEM: Payload Length Indicator, or can negotiate through the control plane (OMCI: ONU Management and Control lnterface).
  • the type of TU carried by the GEM is also used to buffer the tributary unit received in several frames on the receiving side that needs to perform service forwarding, when the passive optical network is packaged. When the reception of the data frame is interrupted, it is transmitted in the buffered tributary unit to prevent clock jitter caused by the service interruption.
  • the embodiments of the present invention provide a corresponding encapsulation and decapsulation device. The method and apparatus of the embodiments of the present invention are described in detail below.
  • Embodiment 1 A method for carrying an SDH service in a GPON, the process shown in FIG. 1 includes the following steps:
  • the embodiment of the present invention uses a variable length GEM frame to carry various types of TUs in the SDH, maps the TU to the payload part of the GEM frame, and adds a 5-byte GEM frame header to form a GEM frame, as shown in FIG. 2 .
  • GEM frame header includes payload length indication (PLI, 12 bits), port identification (Port ID, 12 bits), payload type indication (PTI, 3 bits) and header error control (HEC, 13 bits) are four parts.
  • the payload length of the GEM frame carrying the TU is fixed, which is determined by the size of the TU structure.
  • the TU can be obtained from the SDH service data encapsulation or from the device with the SDH interface. The following briefly describes the process of encapsulating the SDH service data into TUs to describe the type and structure of the TU:
  • TDM service in the SDH service Take the TDM service in the SDH service as an example.
  • the normal TDM service data includes different types such as Tl, E1, T2, ⁇ 3, and ⁇ 3.
  • the corresponding data rates are: T1 is 1544 kbps, El is 2048 kbps, and T2 is 6312 kbps.
  • T3 is 44736 kbps and E3 is 34368 kbps.
  • TU-1 In the SDH transmission structure, there are three types of TUs: TU-1, TU-2, and TU-3.
  • TU-1 is used to carry El or Tl, which corresponds to TU-11 and TU-12 in SDH structure respectively;
  • TU-2 is used to carry T2;
  • TU-3 is used to carry T3 and ⁇ 3.
  • Step 1 Map the TDM service data to the SDH corresponding standard container (C: Container) according to its data rate; see Figure 3:
  • T1 El are loaded into the standard container C1
  • T1 corresponds to the standard container C-ll
  • E1 corresponds to the standard container C-12
  • the frame structure of C-11 and C-12 is a multiframe containing 4 sub-frames
  • the framing period of C-11 and C-12 multiframes is 500 microseconds
  • the T2 is loaded into the standard container C-2;
  • the standard container mainly performs the adaptation function such as rate adjustment, and the TDM service data is converted into a synchronization signal after being adjusted by the code rate in the standard container;
  • POH Path OverHead
  • V5 is the first byte of the multi-frame, which is the channel status and signal tag byte, with error detection, signal mark, channel Status indication and other functions
  • J2 is the channel trace byte used to place the low-order channel access point identifier
  • N2 is the network operator byte, which provides low-order channel serial monitoring function
  • K4 byte first to fourth bits Transmission channel protection signaling, the fifth to seventh bits are remote failure indication, and the eighth bit is reserved;
  • the POH of VC-3 consists of Jl, B3, C2, Gl, F2, H4, F3, K3, Nl nine bytes, located in the first column of the VC-3 frame structure;
  • J1 is the channel trace byte, used to place High-order channel access point identifier;
  • B3 places channel BIP-8 code, has high-order channel error monitoring function;
  • C2 is signal tag byte, used to indicate the multiplex structure and payload nature of VC frame;
  • G1 is channel Status byte, used to monitor channel status and performance;
  • F2, F3 are channel user bytes, providing official communication between channel units;
  • 114 is 11; position indication byte, indicating the multiframe type and net of the payload Load position; K3 byte first to four-bit transmission channel protection signaling, fifth to eight-bit standby;
  • N1 is the network operator byte, which provides high-order channel series monitoring.
  • TU PTR tributary pointer
  • the TU-1/2 PTR includes four bytes of VI, V2, V3, and V4; the VI and V2 bytes are actual pointers, indicating that the first byte V5 of the VC-1/2 multiframe is in the TU-1/2.
  • the specific position of the V3 byte is the negative adjustment position; the V4 byte is the reserved byte; the schematic diagrams of the TU-11, TU-12, and TU-2 generated after adding the pointer are shown in Figures 4, 5, and 6 respectively;
  • 4 shows a block frame structure of TU-11 of 4 rows of X (3 ⁇ 9 ) columns; similarly, FIG. 5 shows a block frame structure of TU-12 of 4 rows of X ( 4 x 9 ) columns;
  • Figure 6 shows the block frame structure of TU-2 of 4 rows X (12 x 9 ) columns;
  • the TU-3 PTR includes three bytes of H1, H2, and H3; the H1 and H2 bytes are actual pointers, indicating the offset between the first byte J1 of the VC-3 frame and the last H3 byte in the pointer. H3 byte is the negative adjustment position; the schematic diagram of the TU-3 structure generated after adding the pointer is shown in Figure 7, which shows the block frame structure of TU-3 with 9 rows x 85 columns bytes + 3 bytes. ;
  • the load can be byte-tuned by the TU PTR pointer, and the pointer can also perform frequency and phase calibration, as well as to accommodate the frequency jitter and drift of the network.
  • TU-1 and TU-2 are every 500.
  • the GEM frame is loaded once and sent in microseconds, and the TU-3 loads the GEM frame once every 125 microseconds and transmits it. This transmission cycle is used by the GP0N clock system. Therefore, the GPON clock system is synchronized with the SDH transmission system clock to ensure clock integrity.
  • the embodiment of the present invention implements the transmission of the SDH service in the GPON by directly mapping the tributary unit in the SDH to the GEM. Since the standard SDH tributary unit frame structure can be used, the SDH network can be directly integrated with the SDH network. And based on the pointer adjustment mechanism of the branch unit, the extraction of the VC including the SDH service data and the synchronization of the service clock can be conveniently implemented.
  • the embodiment of the present invention provides a specific solution for mapping TDM services of different data rates to different types of tributary units and timings them into GEMs, so that the embodiments of the present invention can be applied to existing GPON systems.
  • the second embodiment is a method for receiving an SDH service in a GPON.
  • the process is as shown in FIG. 8.
  • the method in this embodiment is an inverse process corresponding to the first embodiment, and the SDH service transmitted by using the method in the first embodiment is received. Including steps:
  • the TU of the payload part loaded in the GEM frame is taken out; since the GEM frame loading the TU has a fixed load length, the TU type carried by the GEM frame may be determined according to the PLI of the GEM frame;
  • the TU may perform service transmission, for example, forwarding the TU to the connected SDH network, and of course, pressing The multiplex, the encapsulation, and the like are required to be performed.
  • the mechanism for avoiding the clock jitter caused by the GEM frame reception interrupt is also used in the embodiment, that is, the TU received by the frame is buffered.
  • the service is transmitted with the buffered TU.
  • a specific applicable scenario of this mechanism is the PON system ranging. When the PON system is ranging, all normal ONU/ONT services will be interrupted for 2 frames.
  • the ONU/ONT If the ONU/ONT is in the transmitting state, it will be stopped.
  • the time of the service is 2 frames.
  • the OLT of the receiving end cannot receive the GEM frame sent by the ONU/ONT, and the TU can be used for the service transmission. Time jitter caused by business interruption.
  • the step 803 can perform the acquisition of the SDH service data.
  • the obtaining process can be performed according to the standard SDH receiving process, and specifically, the method includes: The PTR pointer determines the specific location of the VC in the TU; takes out the VC, terminates the POH overhead of the VC, and obtains the SDH service data in the payload.
  • the third embodiment is a method for receiving an SDH service in a GPON.
  • the process is as shown in FIG. 9.
  • the method in this embodiment is basically the same as the second embodiment.
  • the difference is that the TU of the GEM is negotiated through the OMCI before the data is received.
  • Type including steps:
  • the OMCI negotiates to obtain an indication of the TU type carried by the GEM.
  • the ONT in the GPON actively reports the TU type to be sent by the OLT, and the OLT confirms that it has received the report of the ONT.
  • the ONT reports the type of TU that it wants to send, and the ONT acknowledges that it has received the report from the OLT.
  • the embodiment of the present invention is not limited to this negotiation mode, and other negotiation methods may be used.
  • the embodiment of the present invention is directed to the SDH service feature transmitted by the method in the first embodiment, and receives and prepares the service for the TU obtained after the decapsulation or obtains the corresponding SDH service data from the load structure.
  • the embodiment of the present invention is also used to buffer a tributary unit received by a plurality of frames on a receiving side that needs to perform service forwarding. When the reception of the encapsulated data frame of the passive optical network is interrupted, the tributary unit transmits the buffer. Thereby, the jitter of the clock caused by the service interruption caused by the situation such as ranging is prevented.
  • an SDH service sending device as shown in FIG. 10, includes a package module 11 and a sending module 12;
  • the encapsulating module 11 includes a mapping module 111 and a framing module 112.
  • the mapping module 111 is configured to map the tributary unit loaded with the synchronous digital system service data to the load of the passive optical network encapsulated data frame. section;
  • the framing module 112 is configured to add a frame header of the passive optical network encapsulated data frame to the passive optical network encapsulated data frame load generated by the mapping module 111 to form a passive optical network encapsulated data frame;
  • the sending module 12 is configured to send a passive optical network encapsulated data frame generated by the encapsulating module 11.
  • the SDH service sending apparatus may perform the package bearer on the SDH service by using the method in the first embodiment.
  • the SDH service encapsulation device can be deployed in an OLT device on the office side or on the ONU/ONT device on the user side.
  • the SDH service sending apparatus in the embodiment of the present invention can directly map the tributary unit in the SDH to the GEM, realize the transmission of the SDH service in the GPON, and can adopt the standard SDH tributary unit frame structure, so the present invention
  • the apparatus of the embodiment can be directly integrated with the SDH network, and the extraction of the VC including the SDH service data and the synchronization of the service clock can be conveniently implemented based on the pointer adjustment mechanism of the branch unit.
  • the device in the embodiment of the present invention can also provide a specific solution for mapping TDM services of different data rates to different types of tributary units and timing into the GEM, so that the device of the embodiment of the present invention can be applied to the existing GPON system. .
  • Embodiment 5 An SDH service receiving apparatus, as shown in FIG. 11, includes a receiving module 21, a first decapsulation module 22, and a second decapsulation module 23;
  • the receiving module 21 is configured to receive a passive optical network encapsulated data frame.
  • the first decapsulation module 22 is configured to extract, from the passive optical network package data frame received by the receiving module 21, the synchronous digital system branch unit loaded in the load portion thereof;
  • the second decapsulation module 23 is configured to obtain time division multiplexing service data from a load structure of the branch unit obtained from the first decapsulation module 22.
  • the SDH service decapsulation apparatus in this embodiment can receive and decapsulate the SDH service by using the method in the second embodiment.
  • the SDH service receiving device can be deployed in the ONU/ONT device on the user side in the actual network.
  • Embodiment 6 an SDH service receiving apparatus, as shown in FIG. 12, includes a receiving module 31, a first decapsulation module 32, a service sending module 33, and a cache module 34;
  • the receiving module 31 is configured to receive a data frame of the passive optical network package
  • the first decapsulation module 32 is configured to extract, from the passive optical network package data frame received by the receiving module 31, the synchronous digital system branch unit loaded in the load portion thereof;
  • the service sending module 33 is configured to send the tributary unit obtained by the decapsulation module 32 to the service, and the cache module 34 is configured to buffer the tributary unit received by the plurality of frames, when the receiving of the encapsulated data frame of the passive optical network occurs. When interrupted, the buffered tributary unit is provided to the service transmitting module 33 for transmission.
  • the SDH service receiving apparatus can receive and decapsulate the SDH service by using the method in the second embodiment.
  • the SDH service decapsulation device is applicable to the OLT device deployed on the office side, so that the GPON network can directly access the SDH network for service transmission.
  • the SDH service receiving apparatus of the fifth embodiment and the sixth embodiment of the present invention directly maps the tributary unit in the SDH to the GEM to implement the transmission of the SDH service in the GPON, and the user-side terminal type device unblocks
  • the obtained TU performs service transmission or obtains corresponding SDH service data from its load structure.
  • the receiving apparatus in the embodiment of the present invention is further configured to buffer a tributary unit received in a plurality of frames on a receiving side that needs to perform service forwarding, and when the receiving of the encapsulated data frame of the passive optical network is interrupted, the tributary unit is buffered.
  • the transmission is performed, thereby preventing the jitter of the clock caused by the service interruption caused by the situation such as ranging.

Description

在无源光网络中传输同步数字体系业务的方法及装置 本申请要求于 2006 年 8 月 16 日提交中国专利局、 申请号为 200610109399.2、 发明名称为 "在无源光网络中传输同步数字体系业务的方法 及装置 "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。 技术领域
本发明涉及通讯技术领域,尤其涉及一种在无源光网络中传输同步数字体 系业务的方法及装置。
背景技术
无源光网络( PON: Passive Optical Network )是一种点到多点的光纤接入 网, 它由局侧的光线路终端 ( OLT: Optical Line Terminal )、 用户侧的光网络 单元 (ONU: Optical Network Unit ) /光网络终端 (ONT: Optical Network Terminal ) 以及光分配网络 ( ODN: Optical Distribution Network )组成。 随着 PON技术的发展吉比特无源光网络( GPON: Gigabit Passive Optical Network ) 正成为研究的热点, 如何在 GPON 网络上通过具有成本效益的方式承载现有 可盈利的同步数字体系 (SDH: Synchronous Digital Hierarchy )通信业务, 是 GPON网络获得应用推动和支持需要解决的重要问题。
在 SDH业务中,各种速率的时分复用( TDM: Time Division Multiplexing ) 业务占有重要地位, 目前, 在 GPON网络中, 实现 TDM业务承载的主要方式 有两种:
一种是直接将 TDM 业务映射到无源光网络封装 ( GEM : GPON Encapsulation Method )数据帧中的 "TDM over GEM" 方式; 该方式釆用不定 长的 GEM帧对 TDM业务数据进行封装, 传输局限于 OLT与 ONT之间, 并 且由于时钟恢复釆用的是自适应方式,其恢复时钟很难满足对抖动和漂移的控 制;
另一种是将 TDM 业务通过以太网 (Ethernet ) 帧传输的 "TDM over Ethernet" 方式; 该方式需要基于以太网帧的编码格式, 需要较大的传输带宽, 增加了 ONU的成本。
为解决上述问题, 也有提出利用 SDH结构帧来实现 TDM业务在 GPON 网络中的承载, 即 "SDH over GEM" 方式。 目前主要有两种实现方法: 第一种方法是利用改动后的 SDH的虚容器( VC: Virtual Container )来承 载 TDM业务; 基本方法是, 修改 SDH的虚容器 VC11和 VC12的帧结构, 将 Tl、 El速率的 TDM业务分别映射到更改后的 VC11、 VC12的帧结构中, 再 将改动的 VC11、 VC12帧的每个块封装到 GEM帧, 通过 GEM帧传输 TDM 业务。该方法需要改动映射的业务帧结构,无法实现 SDH帧到终端 ONT的直 接传输, 由于结构非标准因而也无法实现结构化 TDM业务的传输; 并且由于 虚容器只提供正、 反向调整填充比特, 因此无法实现字节调整;
第二种方法是把各种类型的 TDM业务, 以忽略数据结构的载荷形式、 或 者釆用锁定数据结构的载荷形式、 或者用指针指示数据结构的浮动载荷形式 等, 封装到 SDH的虚支路( VT: Virtual Tributary ) 帧结构中; 再将 VT封装 到 Ethernet帧内;然后将 Ethernet帧封装到 GEM帧的负载中,即通过 "Ethernet over GEM" 的方式, 实现 TDM在 GPON网络中的承载。 该方法虽然不需要 修改现有的标准, 但 TDM业务数据需要经过 VT、 Ethernet帧、 GEM帧三次 映射, 实现较复杂, 并且导致协议开销过多, 需要占用较大的带宽。
发明内容
本发明提供一种在无源光网络中承载和接收同步数字体系业务的方法及 装置,使得不需要修改现有标准的 SDH支路单元帧结构, 即可直接与 SDH网 络融合, 并可简单的实现 SDH业务数据的提取。
本发明还提供一种同步数字体系数据帧映射到无源光网络数据帧的方法, 以实现同步数字体系业务在无源光网络中的传输。
本发明提供的一种在无源光网络中承载同步数字体系业务的方法, 包括: 将装载有同步数字体系业务数据的支路单元封装到无源光网络封装数据 帧中;
发送所述无源光网络封装数据帧。
本发明还提供一种在无源光网络中接收同步数字体系业务的方法, 包括: 接收无源光网络封装数据帧;
取出装载于所述无源光网络封装数据帧的负载部分中的同步数字体系支 路单元。
本发明还提供一种同步数字体系业务发送装置, 包括:
封装模块,用于将装载有同步数字体系业务数据的支路单元封装到无源光 网络封装数据帧中;
发送模块, 用于发送所述封装模块生成的无源光网络封装数据帧。
本发明同时提供一种同步数字体系业务接收装置, 包括:
接收模块, 用于接收无源光网络封装数据帧;
第一解封装模块,用于从所述接收模块收到的无源光网络封装数据帧中取 出装载于其负载部分中的同步数字体系支路单元。
本发明还提供一种同步数字体系数据帧映射到无源光网络数据帧的方法, 包括:
将同步数字体系的支路单元整个数据帧映射到无源光网络数据帧的负载 部分;
用无源光网络数据帧头的长度指示来标识无源光网络数据帧的负载部分 的支路单元类型。
本发明釆用将 SDH中的支路单元直接映射到 GEM中的方法实现 SDH业 务在 GPON中的传输, 由于可釆用标准的 SDH支路单元帧结构, 因此能够直 接与 SDH网络融合, 简单地实现 SDH业务数据的承载与提取。。 下面通过具 体实施方式并结合附图对本发明作进一步的详细说明。
附图说明 图 1是本发明实施例一在 GPON中承载 SDH业务的方法流程示意图; 图 2是本发明实施例一中 TU映射到 GEM帧示意图;
图 3是本发明实施例一中 TDM业务数据装载入 TU路径示意图; 图 4是本发明实施例一中 TU-11结构示意图;
图 5是本发明实施例一中 TU-12结构示意图;
图 6是本发明实施例一中 TU-2结构示意图;
图 7是本发明实施例一中 TU-3结构示意图;
图 8是本发明实施例二在 GPON中接收 SDH业务的方法流程示意图; 图 9是本发明实施例三在 GPON中接收 SDH业务的方法流程示意图; 图 10是本发明实施例四 SDH业务发送装置结构示意图;
图 11是本发明实施例五 SDH业务接收装置结构示意图;
图 12是本发明实施例六 SDH业务接收装置结构示意图。
具体实施方式 本发明实施例提供在无源光网络中承载和接收 SDH业务的方法, 将承载 SDH业务的 SDH支路单元( TU: Tributary unit )直接映射到 GEM的负载中, 实现 SDH业务在 GPON中的传输。各种不同速率的 TDM业务可按照现有 SDH 规定的封装过程装载入相应类型的 TU中, 各类型 TU按照其成帧周期定时装 载到 GEM帧中并发送, 而在接收端以逆过程剥离封装转发或提取 SDH业务 数据, 接收端可通过 GEM帧的负载长度指示( PLI: Payload Length Indicator ) 来判断其所承载的 TU类型,也可以通过控制面( OMCI: ONU Management and Control lnterface )来协商 GEM承载的 TU类型。 此外, 为避免由于测距等情 况引起的业务中断而造成的时钟抖动,本发明实施例还釆用在需要进行业务转 发的接收侧緩存若干帧接收到的支路单元,当无源光网络封装数据帧的接收出 现中断时, 以緩存的支路单元进行发送,从而防止因业务中断而引起的时钟抖 动。 本发明实施例并提供相应的封装、 解封装装置。 以下分别对本发明实施例 的方法和装置进行详细说明。
实施例一、 一种在 GPON中承载 SDH业务的方法, 流程如图 1所示, 包 括步骤:
101、 将装载有 SDH业务数据的 TU映射到 GEM帧的负载部分;
102、 添加 GEM帧的帧头构成 GEM帧;
103、 发送装载 TU结构的 GEM帧。
通过上述步骤 101和步骤 102后,即完成了将装载有 SDH业务数据的 TU 封装到 GEM帧中的过程。
本发明实施例利用变长的 GEM帧来承载 SDH中各种类型的 TU, 将 TU 映射到 GEM帧的负载部分, 再添加 5个字节的 GEM帧头, 即构成一个 GEM 帧,如图 2所示。 GEM帧头包括净荷长度指示( PLI, 12比特)、端口标识( Port ID, 12比特)、 净荷类型指示(PTI, 3比特)和头错误控制 (HEC, 13比特) 四个部分。 承载 TU的 GEM帧的负载长度是固定的, 由 TU结构的大小决定。
TU可以从 SDH业务数据封装得到, 也可以从具有 SDH接口的设备接收 获得, 以下简要给出 SDH业务数据封装为 TU的过程以说明 TU的类型和结 构:
以 SDH业务中的 TDM业务为例, 通常的 TDM业务数据包括 Tl、 E1、 T2、 Τ3、 Ε3等不同类型, 其对应的数据速率为: T1为 1544 kbps, El为 2048 kbps, T2为 6312 kbps, T3为 44736 kbps, E3为 34368 kbps。
在 SDH传输结构中, TU有三种类型: TU-1、 TU-2、 TU-3。 其中, TU-1 用于承载 El或 Tl , 分别对应于 SDH结构中的 TU-11和 TU-12; TU-2用于承 载 T2; TU-3用于承载 T3、 Ε3。
将这些不同数据速率的 TDM业务装载到各类型 TU中可釆用现有的 SDH 映射、 成帧规程, 如图 3所示, 包括:
步骤 1、将 TDM业务数据按照其数据速率映射到 SDH相应的标准容器( C: Container ) 中; 参见图 3:
将 Tl、 El装入标准容器 C-l , T1对应标准容器 C-ll , E1对应标准容器 C-12; C-11与 C-12的帧结构是包含了 4个子帧的复帧, C-11具有 4 ( 9x3-2 ) =100字节, C-12具有 4 ( 9x4-2 ) =136字节, C-11与 C-12复帧的成帧周期为 500微秒;
将 T2装入标准容器 C-2; C-2的帧结构是包含了 4个子帧的复帧, C-2具 有 4 ( 9x12-2 ) =424字节; C-2复帧的成帧周期为 500微秒;
将 T3、E3装入标准容器 C-3; C-3的帧结构只包含 1个子帧 ,具有 9x85=765 字节; C-3帧的成帧周期为 125微秒;
标准容器主要完成速率调整等适配功能, TDM业务数据在标准容器中经 过码速调整后变换为同步信号;
步骤 2、为标准容器 C-n( n = 1、 2、 3 )添加通道开销( POH: Path OverHead ) 构成相应的 VC-n;
VC-1 (包括 VC-11和 VC-12 )和 VC-2的 POH由 V5、 J2、 N2、 K4四个 字节组成, 分别添加在 4个子帧的前端构成 VC-1/2复帧; V5是复帧的第一个 字节, 为通道状态和信号标记字节, 具有误码检测、 信号标记、 通道状态指示 等功能; J2为通道踪迹字节, 用来放置低阶通道接入点标识符; N2为网络营 运者字节, 可提供低阶通道串联监控功能; K4字节的第一至四比特传送通道 保护信令, 第五至七比特为远端失效指示, 第八比特备用;
VC-3的 POH由 Jl、 B3、 C2、 Gl、 F2、 H4、 F3、 K3、 Nl九个字节组成, 位于 VC-3帧结构的第一列; J1为通道踪迹字节, 用来放置高阶通道接入点标 识符; B3放置通道 BIP-8码, 具有高阶通道误码监视功能; C2为信号标记字 节, 用来指示 VC帧的复接结构和净荷性质; G1为通道状态字节, 用于对通 道状态和性能进行监视; F2、 F3 为通道使用者字节, 提供通道单元间的公务 通信; 114为 11;位置指示字节, 指示有效负荷的复帧类别和净荷位置; K3字 节的第一至四比特传送通道保护信令, 第五至八比特备用; N1 为网络营运者 字节, 可提供高阶通道串联监控功能。
步骤 3、为虚容器 VC-n ( n = 1、 2、 3 )添加指针( TU PTR: tributary pointer ) 开销, 构成 TU-n;
TU-1/2 PTR包括 VI、 V2、 V3、 V4四个字节; VI、 V2字节为实际指针, 指示 VC-1/2复帧的第一个字节 V5在 TU-1/2中的具体位置; V3字节为负调 整位置; V4字节为保留字节; 添加指针后生成的 TU-11、 TU-12、 TU-2结构 示意图分别如图 4、 5、 6所示; 图 4示出了 4行 X ( 3 χ 9 ) 列的 TU-11的块 状帧结构; 同理, 图 5示出了 4行 X ( 4 x 9 )列的 TU-12的块状帧结构; 图 6 示出了 4行 X ( 12 x 9 ) 列的 TU-2的块状帧结构;
TU-3 PTR包括 Hl、 H2、 H3三个字节; Hl、 H2字节为实际指针, 指示 VC-3帧的第一个字节 J1与指针中最后一个 H3字节之间的偏移量; H3字节为 负调整位置; 添加指针后生成的 TU-3结构示意图如图 7所示, 图中示出了 9 行 X 85列字节 + 3字节的 TU-3的块状帧结构;
通过 TU PTR指针可以对负载进行字节调整,并且指针还可完成频率和相 位校准, 还用来容纳网络的频率抖动和漂移。
由上述 TU的成帧周期可知, 为保证时钟的同步, TU-1和 TU-2每隔 500 微秒装入 GEM帧一次并进行发送, TU-3每隔 125微秒装入 GEM帧一次并进 行发送。 这个发送周期 ^^于 GP0N时钟系统的, 因此, GPON时钟系统与 SDH传输系统时钟是同步的, 它可以保证时钟的完整性。
本发明实施例釆用将 SDH中的支路单元直接映射到 GEM中的方法实现 SDH业务在 GPON中的传输, 由于可釆用标准的 SDH支路单元帧结构, 因此 能够直接与 SDH网络融合, 并且基于支路单元所具有的指针调整机制可方便 地实现包含 SDH业务数据的 VC的提取以及业务时钟的同步。
另外, 本发明实施例还提供各种不同数据速率的 TDM业务映射到不同类 型支路单元并定时封装进 GEM的具体方案, 使本发明实施例能够应用于现有 GPON系统中。
实施例二、 一种在 GPON中接收 SDH业务的方法, 流程如图 8所示, 本 实施例方法为与实施例一相应的逆过程, 对釆用实施例一方法传输的 SDH业 务进行接收, 包括步骤:
801、 接收 GEM帧;
802、 将装载于 GEM帧的负载部分的 TU取出; 由于装载 TU的 GEM帧 具有固定的负载长度, 因此, 可以根据 GEM帧的 PLI来判断其所承载的 TU 类型;
803、 按照 TU 的类型对其进行业务发送或从其负载结构中获取相应的 SDH业务数据。
若执行本发明实施例接收方法的设备为局侧设备,例如 OLT等,步骤 803 中还可执行对 TU进行业务发送, 例如将 TU转发至相连接的 SDH网络中, 当然, 在转发时可按需要进行相应的复用、 封装等操作; 在将 TU进行业务发 送的情况下, 本实施例中还釆用避免 GEM帧接收中断引起时钟抖动的机制, 即: 緩存若干帧接收到的 TU, 当 GEM帧的接收出现中断时, 以所緩存的 TU 进行业务发送。此机制的一个具体适用的场景是 PON系统测距的情况,在 PON 系统测距时, 所有正常工作 ONU/ONT的业务都会被中断 2帧, 若 ONU/ONT 处于发送状态, 即其被停止发送业务的时间为 2帧, 此时, 接收端的 OLT收 不到 ONU/ONT发送的 GEM帧, 就可以用緩存的 TU来进行业务发送, 防止 业务中断造成的时间抖动。
若执行本发明实施例接收方法的设备为用户侧终端型设备,例如 ONT等, 则步骤 803可执行 SDH业务数据的获取;该获取过程可按照标准的 SDH接收 过程进行, 具体可包括: 根据 TU PTR指针确定 VC在 TU中的具体位置; 取 出 VC, 终结 VC的 POH开销, 获得净荷中的 SDH业务数据。
实施例三、 一种在 GPON中接收 SDH业务的方法, 流程如图 9所示, 本 实施例方法为与实施例二基本相同, 区别之处在于在数据接收前通过 OMCI 来协商 GEM承载的 TU类型, 包括步骤:
901、 通过 OMCI进行协商, 获得 GEM承载的 TU类型的指示; 比如, GPON中的 ONT主动向 OLT上报自己所要发送的 TU类型, OLT 应答确认自己已收到 ONT的上报; 也可以是 OLT主动向 ONT上报自己所要 发送的 TU类型, ONT应答确认自己已收到 OLT的上报。 当然, 本发明实施 例并不局限于这种协商方式, 还可以釆用其他协商方式。
902、 接收 GEM帧;
903、 将装载于 GEM帧的负载部分的 TU取出;
904、 按照 TU 的类型对其进行业务发送或从其负载结构中获取相应的 SDH业务数据。
本发明实施例针对实施例一方法传输的 SDH业务特点, 对其进行接收并 备, 对解封后得到的 TU进行业务发送或从其负载结构中获取相应的 SDH业 务数据。 另外, 本发明实施例还釆用在需要进行业务转发的接收侧緩存若干帧 接收到的支路单元, 当无源光网络封装数据帧的接收出现中断时, 以緩存的支 路单元进行发送,从而防止了由于测距等情况引起的业务中断而造成的时钟的 抖动。
下面对应用于上述传输方法的系统进行详细说明。
实施例四、 一种 SDH业务发送装置, 如图 10所示, 包括封装模块 11和 发送模块 12;
封装模块 11 , 用于将装载有同步数字体系业务数据的支路单元封装到无 源光网络封装数据帧中, 封装模块 11包括映射模块 111和成帧模块 112; 映射模块 111 , 用于将装载有同步数字体系业务数据的支路单元映射到无 源光网络封装数据帧的负载部分;
成帧模块 112, 用于为映射模块 111生成的无源光网络封装数据帧负载添 加无源光网络封装数据帧的帧头构成无源光网络封装数据帧;
发送模块 12, 用于发送封装模块 11生成的无源光网络封装数据帧。
本实施例 SDH业务发送装置可釆用实施例一中的方法对 SDH业务进行封 装承载。 本实施例 SDH业务封装装置在实际网络中可以有灵活的布局表现方 式, 可以部署于局侧的 OLT设备中, 也可以部署于用户侧的 ONU/ONT设备 中。
利用本发明实施例的 SDH业务发送装置,可以将 SDH中的支路单元直接 映射到 GEM中, 实现 SDH业务在 GPON中的传输, 而且可釆用标准的 SDH 支路单元帧结构, 因此本发明实施例的装置能够直接与 SDH网络融合, 并且 基于支路单元所具有的指针调整机制可方便地实现包含 SDH业务数据的 VC 的提取以及业务时钟的同步。
另外, 本发明实施例的装置还可提供各种不同数据速率的 TDM业务映射 到不同类型支路单元并定时封装进 GEM的具体方案, 使本发明实施例的装置 能够应用于现有 GPON系统中。
实施例五、 一种 SDH业务接收装置, 如图 11所示, 包括接收模块 21、 第一解封装模块 22和第二解封装模块 23;
接收模块 21 , 用于接收无源光网络封装数据帧;
第一解封装模块 22, 用于从接收模块 21收到的无源光网络封装数据帧中 取出装载于其负载部分中的同步数字体系支路单元;
第二解封装模块 23 , 用于从第一解封装模块 22获得的支路单元的负载结 构中获取时分复用业务数据。
本实施例 SDH业务解封装装置可釆用实施例二中的方法对 SDH业务进行 接收和解除封装。 本实施例 SDH业务接收装置在实际网络中可部署于用户侧 的 ONU/ONT设备中。 实施例六、 一种 SDH业务接收装置, 如图 12所示, 包括接收模块 31、 第一解封装模块 32、 业务发送模块 33和緩存模块 34;
接收模块 31 , 用于接收无源光网络封装数据帧;
第一解封装模块 32, 用于从接收模块 31收到的无源光网络封装数据帧中 取出装载于其负载部分中的同步数字体系支路单元;
业务发送模块 33 , 用于将解封装模块 32获得的支路单元进行业务发送; 緩存模块 34 , 用于緩存若干帧接收到的支路单元, 当所述无源光网络封 装数据帧的接收出现中断时, 将緩存的支路单元提供给业务发送模块 33进行 发送。
本实施例 SDH业务接收装置可釆用实施例二中的方法对 SDH业务进行接 收和解除封装。本实施例 SDH业务解封装装置适用于部署于局侧的 OLT设备 中, 使得 GPON网络能够直接接入 SDH网络中进行业务传输。
上述本发明实施例五和实施例六的 SDH业务接收装置针对发送端将 SDH 中的支路单元直接映射到 GEM中实现 SDH业务在 GPON中的传输的特点, 用户侧终端型设备,对解封后得到的 TU进行业务发送或从其负载结构中获取 相应的 SDH业务数据。 另外, 本发明实施例的接收装置还釆用在需要进行业 务转发的接收侧緩存若干帧接收到的支路单元,当无源光网络封装数据帧的接 收出现中断时, 以緩存的支路单元进行发送,从而防止了由于测距等情况引起 的业务中断而造成的时钟的抖动。
以上对本发明实施例所提供的在无源光网络中承载和接收时分复用业务 方式进行了阐述,以上实施例的说明只是用于帮助理解本发明的方法及其核心 思想; 同时, 对于本领域的一般技术人员, 依据本发明的思想, 在具体实施方 式及应用范围上均会有改变之处, 综上所述, 本说明书内容不应理解为对本发 明的限制。

Claims

权 利 要 求
1、 一种在无源光网络中承载同步数字体系业务的方法, 其特征在于, 包 括:
将装载有同步数字体系业务数据的支路单元封装到无源光网络封装数据 帧中;
发送所述无源光网络封装数据帧。
2、根据权利要求 1所述的在无源光网络中承载同步数字体系业务的方法, 其特征在于, 所述将支路单元封装到无源光网络封装数据帧中的步骤包括: 将所述支路单元映射到无源光网络封装数据帧的负载部分;
添加无源光网络封装数据帧的帧头构成无源光网络封装数据帧。
3、根据权利要求 2所述的在无源光网络中承载同步数字体系业务的方法, 其特征在于: 所述支路单元包括支路单元一、 支路单元二和支路单元三; 发送。
4、 根据权利要求 1至 3任意一项所述的在无源光网络中承载同步数字体 系业务的方法, 其特征在于, 所述同步数字体系业务包括时分复用业务, 将所 述时分复用业务数据装入所述支路单元的步骤包括:
将时分复用业务数据按照其数据速率映射到同步数字体系相应的标准容 器中;
为所述标准容器添加通道开销构成虚容器;
为所述虚容器添加指针开销构成支路单元。
5、根据权利要求 2所述的在无源光网络中承载同步数字体系业务的方法, 其特征在于, 所述方法还包括: 将数据速率为 1544 kbps的 T1业务、 数据速 率为 2048 kbps的 E1业务对应装入所述支路单元一中;
将数据速率为 6312 kbps的 T2业务对应装入所述支路单元二中; 将数据速率为 44736 kbps的 T3、 数据速率为 34368 kbps的 E3业务对应 装入所述支路单元三中。
6、 一种在无源光网络中接收同步数字体系业务的方法, 其特征在于, 包 括:
接收无源光网络封装数据帧;
取出装载于所述无源光网络封装数据帧的负载部分中的同步数字体系支 路单元。
7、根据权利要求 6所述的在无源光网络中接收同步数字体系业务的方法, 其特征在于, 所述方法还包括:
发送所述同步数字体系支路单元。
8、根据权利要求 7所述的在无源光网络中接收同步数字体系业务的方法, 其特征在于, 所述方法还包括: 緩存若干帧接收到的支路单元;
当所述无源光网络封装数据帧的接收出现中断时,以所緩存的支路单元进 行业务发送。
9、根据权利要求 6所述的在无源光网络中接收同步数字体系业务的方法, 其特征在于, 所述方法还包括:
从所述支路单元的负载中获取同步数字体系业务数据。
10、 根据权利要求 9 所述的在无源光网络中接收同步数字体系业务的方 法, 其特征在于, 所述从支路单元的负载中获取同步数字体系业务数据的步骤 包括:
获得所述无源光网络封装数据帧承载的支路单元类型;
按照所述支路单元类型从所述支路单元的负载中获取同步数字体系业务 数据。
11、 根据权利要求 10所述的在无源光网络中接收同步数字体系业务的方 法, 其特征在于, 所述获得所述无源光网络封装数据帧承载的支路单元类型的 步骤包括:
根据所述无源光网络封装数据帧的负载长度指示获得其承载的支路单元 类型; 或者
通过控制面协商获得所述无源光网络封装数据帧承载的支路单元类型。
12、 一种同步数字体系业务发送装置, 其特征在于, 包括:
封装模块,用于将装载有同步数字体系业务数据的支路单元封装到无源光 网络封装数据帧中;
发送模块, 用于发送所述封装模块生成的无源光网络封装数据帧。
13、 根据权利要求 12所述的同步数字体系业务发送装置, 其特征在于, 所述封装模块包括:
映射模块, 用于将所述支路单元映射到无源光网络封装数据帧的负载部 分;
成帧模块,用于为所述映射模块生成的无源光网络封装数据帧负载添加无 源光网络封装数据帧的帧头构成无源光网络封装数据帧。
14、 一种同步数字体系业务接收装置, 其特征在于, 包括:
接收模块, 用于接收无源光网络封装数据帧;
第一解封装模块,用于从所述接收模块收到的无源光网络封装数据帧中取 出装载于其负载部分中的同步数字体系支路单元。
15、 根据权利要求 14所述的同步数字体系业务接收装置, 其特征在于, 还包括:
第二解封装模块,用于从所述第一解封装模块获得的支路单元的负载结构 中获取时分复用业务数据。
16、 根据权利要求 14所述的同步数字体系业务接收装置, 其特征在于, 还包括:
业务发送模块, 用于将所述同步数字体系支路单元进行业务发送; 緩存模块, 用于緩存若干帧接收到的支路单元, 当所述无源光网络封装数 据帧的接收出现中断时, 将緩存的支路单元提供给所述业务发送模块进行发 送。
17、一种同步数字体系数据帧映射到无源光网络数据帧的方法, 其特征在 于, 包括:
将同步数字体系的支路单元整个数据帧映射到无源光网络数据帧的负载 部分;
用无源光网络数据帧头的长度指示来标识无源光网络数据帧的负载部分 的支路单元类型。
18、 根据权利要求 17所述的同步数字体系数据帧映射到无源光网络数据 帧的方法, 其特征在于, 所述支路单元包括: 支路单元一、 或支路单元二、 或 支路单元三。
19、 根据权利要求 17所述的同步数字体系数据帧映射到无源光网络数据 帧的方法, 其特征在于:
所述支路单元为支路单元一或支路单元二时,每一个支路单元映射到一个 无源光网络数据帧的负载部分;
所述支路单元为支路单元三时 ,每一个支路单元映射到一个无源光网络数 据帧的负载部分。
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