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WO2004002076A1 - Procede de mise en correspondance et de cessation de correspondance entre des paquets de donnees gigabit ethernet et une structure de trame sdh - Google Patents

Procede de mise en correspondance et de cessation de correspondance entre des paquets de donnees gigabit ethernet et une structure de trame sdh Download PDF

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Publication number
WO2004002076A1
WO2004002076A1 PCT/CN2003/000406 CN0300406W WO2004002076A1 WO 2004002076 A1 WO2004002076 A1 WO 2004002076A1 CN 0300406 W CN0300406 W CN 0300406W WO 2004002076 A1 WO2004002076 A1 WO 2004002076A1
Authority
WO
WIPO (PCT)
Prior art keywords
gigabit ethernet
virtual
ethernet data
sdh
digital signal
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2003/000406
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English (en)
Chinese (zh)
Inventor
Ke Huang
Xiaobo Li
Yue Liu
Zhiquan Liao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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 AU2003231572A priority Critical patent/AU2003231572A1/en
Publication of WO2004002076A1 publication Critical patent/WO2004002076A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
    • H04J3/1617—Synchronous digital hierarchy [SDH] or SONET carrying packets or ATM cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • 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
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • 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
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols
    • H04J2203/0085—Support of Ethernet

Definitions

  • the invention relates to a transmission method of an Ethernet data packet in an optical medium based on a synchronous digital series (SDH) standard, and particularly relates to a mapping and demapping method between an Ethernet data packet and an SDH frame structure.
  • SDH synchronous digital series
  • Synchronous Digital Hierarchy (SDH), as a basic mode of signal transmission, performs synchronization information transmission, multiplexing, and cross-connection on the channel.
  • the SDH signal is transmitted in the form of a synchronous transmission module (STM), with standard rate values of 155.520 Mbit / s (STM-l), 622.080 Mbit / s (STM-4), 2488.320 Mbit / s (STM-16), and so on.
  • the SDH frame structure is composed of three areas: the information payload (Payload), the segment overhead (SOH), and the management pointer unit (AU PTR).
  • the information payload area contains various information code blocks to be transmitted and is used for channel performance monitoring.
  • Channel overhead bytes (POH) for management, management and control
  • SOH area is located in columns 1 ⁇ 9 XN, 1 ⁇ 3 rows, 5 ⁇ 9 rows, contains bytes for network operation, management and maintenance
  • AU PTR is a
  • the indicator is located in l-9x N columns and 4 rows in the frame, and is used to indicate the position of the first byte of the information payload in the frame.
  • AU-n is another information structure in SDH. It consists of a high-order virtual container and a A corresponding management unit pointer (AU PTR). The process of combining multiple management units AU-n to form a management unit group is called cascading, and the cascaded unit group can be put into the corresponding STM-N frame.
  • adjacent concatenation there are two types of concatenation: adjacent concatenation and virtual concatenation.
  • adjacent concatenation only the first AU-n management unit pointer in multiple AU-n indicates its actual position in the SDH frame. And the POH overhead is valid, the rest of the pointers must be set to 1001SS1111111111 (known as cascading pointers), and the overhead part is inserted into fixed bytes.
  • virtual concatenation all AU-n pointers and overhead are independent and valid.
  • information such as the multiframe number and sequence number is defined in the POH overhead byte H4, where the multiframe number indicates Whether the virtual container VCn is issued at the same time, and the sequence number indicates the multiplexing order of VCn. Therefore, under the virtual concatenation protocol, each VCn transmission can be performed independently.
  • Ethernet is a very popular local area network technology.
  • SDH SDH
  • EOS Ethernet over SDH
  • how to be flexible, Efficiently mapping Ethernet (especially Gigabit Ethernet) data packets into the SDH frame structure and demapping Ethernet data packets from the SDH frame structure are the focal points of the development of EOS technology.
  • the following uses STM-16 frames to transmit two channels of Gigabit Ethernet data and the cascading method is virtual container VC4 adjacent cascade to cascade virtual container VC4-8C as an example to describe the Gigabit Ethernet data packet Mapping and demapping methods between SDH frame structures.
  • mapping method it is generally a process of first encapsulating a Gigabit Ethernet data packet into a virtual container.
  • the data bytes of the Ethernet data packet are placed in each VC4 in VC4-8C in the following order, that is: the first data byte is placed in the first byte of the first VC4, and the second data byte is placed in the first The first byte of 2 VC4, ..., the 8th data byte is placed in the first byte of the 8th VC4, and then the 9th data byte is placed in the second of the 1st VC4 Byte, the 10th data byte is placed in the second byte of the 2nd VC4, ..., the 16th data byte is placed in the second byte of the 8th VC4, and so on, until all All data bytes have been placed.
  • Ethernet data packets are of indefinite length and are discontinuous, before they are encapsulated in VC4-8C, the Ethernet data packets must be marked, and the packets are distinguished from the packets by special bytes. , And fill in the useless bytes in the discontinuous place, so that it can be loaded after a continuous data stream
  • an STM-16 frame Since the rate of an STM-16 frame is 2488.320 Mbit / s, it can be multiplexed into two VC4-8C cascaded virtual containers, that is, one STM-16 frame can transmit two Gigabit network data packets.
  • These two VC4-8Cs are formed by combining 8 VC4s into a cascading virtual container through adjacent cascading. Therefore, in STM-16 frames, there is only the first VC4 management unit pointer in each VC4-8C. And POH overhead are valid, the remaining 7 pointers must be set to fixed values, and the overhead portion is inserted into fixed bytes.
  • the demapping process is inverse to the mapping process, that is, an STM-16 frame is split into two VC4-8C, each VC4-8C corresponds to one Gigabit Ethernet data packet, and then from VC4-8 The Gigabit Ethernet data packet is taken out, and unnecessary bytes added to form a continuous data stream are removed, thereby restoring the original Ethernet data packet.
  • the above-mentioned method for implementing mapping and demapping between Gigabit Ethernet data packets and SDH frames by using adjacent concatenation has the advantages of simple and direct implementation, but has the disadvantages of poor flexibility and serious waste of bandwidth.
  • the object of the present invention is to provide a mapping and demapping method between a Gigabit Ethernet data packet and an SDH frame, which has the advantages of high bandwidth utilization and flexible usage.
  • a mapping method between a Gigabit Ethernet data packet and a synchronous digital series (SDH) frame is provided.
  • the Ethernet data packets sent on each Gigabit Ethernet data sending port are mapped into
  • the SDH frame is first encapsulated into a continuous digital signal stream, and the device for implementing the mapping process between the Gigabit Ethernet data packet and the SDH frame performs the following steps:
  • Each of the virtual containers is independently multiplexed into an SDH frame.
  • a Gigabit Ethernet data packet and synchronization are provided.
  • a method of demapping between digital series (SDH) frames The SDH frame is de-mapped into a continuous digital signal stream containing Ethernet data packets, and then decapsulated into discontinuous Ethernet data packets.
  • SDH digital series
  • a device for implementing a demapping process between a gigabit Ethernet data packet and an SDH frame performs the following steps:
  • mapping and demapping method between a Gigabit Ethernet data packet and an SDH frame since a virtual concatenated virtual container is formed by a virtual concatenation method, each virtual container can be processed and transmitted independently. Therefore, a virtual container instead of a cascaded virtual container can be used as a "basic unit" to transmit Gigabit Ethernet data, which avoids the occurrence of idle virtual containers, thereby making full use of bandwidth resources.
  • the mapping process the corresponding relationship between each Gigabit Ethernet and the virtual container is not fixed as in the prior art, so it is very convenient and flexible.
  • FIG. 2 is a schematic diagram showing a structure of mapping two Gigabit network data into an SDH frame according to the present invention
  • Figure 3 shows the frame structure of an Ethernet packet
  • Figure 4 shows a schematic diagram of encapsulating an Ethernet packet into a continuous digital signal stream using the HDLC protocol
  • Figure 5 shows a schematic diagram showing the demapping of two Gigabit network data from SDH frames.
  • Ethernet data of the present invention will be described below by taking the sum of the two Gigabit Ethernet speeds less than 1.2 Gbit / s and the cascading method as a virtual container VC4 to form a virtual cascade virtual container VC4-8V Mapping and demapping methods between packets and SDH frames.
  • a device for implementing a mapping process between a Gigabit Ethernet data packet and an SDH frame first encapsulates each Ethernet data packet according to a certain encapsulation protocol.
  • the Ethernet data packet has a fixed frame structure as shown in Fig. 3.
  • the packet length of each data packet is between 64 and 1518, which is mainly caused by the unequal data length.
  • the indefinite length of Ethernet data packets determines that the data packets sent by Ethernet are discontinuous, so in order to enable it to be multiplexed into SDH frames, it must first be encapsulated with a certain protocol to make it a continuous digital signal. flow.
  • HDLC high-level link control
  • LAPS SDH Link Access Processing
  • PPP PPP protocol
  • the rate of a virtual container VC4 is 150.366 Mbit / s, so the cascade virtual container VC4-8V formed by cascading according to the virtual cascade protocol (here, 8V represents the virtual cascade formed by 8 virtual containers).
  • each encapsulated Gigabit Ethernet data packet is placed in each VC4 in VC4-8C, and in the present invention, it is used to implement mapping between Gigabit Ethernet data packets and SDH frames.
  • the device in the process puts each encapsulated Gigabit Ethernet data packet into a part of VC4 in VC4-8V.
  • the first Gigabit Ethernet can allocate 3 VC4, so its data packet is put into these 3 Within the VC4, the second Gigabit Ethernet data packet can be allocated to another 5 VC4, so its data packet is put into the other 5 VC4.
  • the number of VC4 allocated to each Gigabit Ethernet is arbitrary. Generally, it can be determined according to the data transmission rate of each Gigabit Ethernet or allocated according to the needs of the user.
  • the Ethernet data packets can be put into VC4- Redistribute before 8V.
  • Ethernet packets can be placed in the assigned VC4 in the manner described above.
  • the first Gigabit Ethernet will put its data in the order of 1 ⁇ 3 in the following order.
  • 3 In VC4 that is: the first data byte is placed in the first byte of the first VC4, the second data byte is placed in the first byte of the second VC4, and the third data byte is placed Enter the first byte of the third VC4, and then the fourth data byte is placed in the second byte of the first VC4, and the fifth data byte is placed in the second word of the second VC4 Section, the sixth data byte is placed in the second byte of the third VC4, ..., and so on, until all data bytes are placed.
  • the above-mentioned insertion method is called a byte interpolation method. It is worth pointing out that the above manner and order of placing are not unique and cannot be exhaustive, so the description here is only illustrative.
  • the POH overhead byte H4 defines the information such as the multiframe number and sequence number, where the multiframe number indicates whether the virtual container VC4 is issued at the same time, and the sequence number indicates the VC4's interleaving multiplexing order, so that each VC4 can be viewed
  • the components are independent of each other and can be placed in different SDH frames independently. In VC4-8C, each VC4 can only be placed in the same SDH frame in order.
  • SDH frames can be generated.
  • the data rate of one VC4-8V corresponds to the rate of two STM-4 frames. Therefore, in order to make full use of bandwidth resources, the VC4-8V can be multiplexed into two STM-4 frames.
  • the G707 standard developed by the International Telecommunication Union Telecommunication Standardization Department (ITU-T) specifies the structure of the SDH frame, the rate level, and the manner in which the virtual container multiplexes into the SDH frame. Therefore, it is better to use it to implement Gigabit Ethernet.
  • the device that maps the data packet to the SDH frame according to the G.707 standard VC4-8V is multiplexed into SDH frames.
  • Fig. 5 shows a schematic diagram showing de-mapping two Gigabit network data from SDH frames.
  • the demapping process is actually the reverse of the mapping process, so similarities to the mapping process will not be described in detail.
  • the device for implementing the demapping process between the Gigabit Ethernet data packet and the SDH frame receives two STM-4 frames belonging to the two Gigabit Ethernets (that is, the data of the two Gigabit Ethernets are both Contained in the 8 virtual containers VC4 of the two STM-4 frames), it puts the 8 virtual containers VC4 in the two STM-4 frames into the cascaded virtual container VC4-8V according to the virtual cascade protocol Inside. This is exactly the opposite of the above process of multiplexing a virtual container VC4-8V into two STM-4 frames, so it will not be described again.
  • each channel of Gigabit Ethernet is allocated a certain number of virtual containers VC4, so each channel of Gigabit Ethernet and the virtual container VC4 have a certain corresponding relationship.
  • the data of the first Gigabit Ethernet is put into the first to third VC4 of VC4-8V, and the data of the second gigabit Ethernet is put into the 4 to 8 VC4, and
  • the insertion method and order are the same as the byte interpolation method and order described above.
  • the device used to implement the demapping process between the Gigabit Ethernet data packet and the SDH frame extracts the bytes from the 1st to 3rd VC4 and discharges them in order to form a continuous digital signal stream. It is sent to the first Gigabit Ethernet data receiving port. The same operation is performed for the 4th to 8th VC4 to form a continuous digital signal flow and sent to the first Gigabit Ethernet data receiving port.
  • the continuous digital signal flow sent to each Ethernet data receiving port needs to be decapsulated into the original discontinuous Ethernet data packet according to the same protocol as the encapsulation, that is, it will be used to implement
  • the device for the mapping process between the Gigabit Ethernet data packet and the SDH frame removes the unnecessary bytes added to compensate for the discontinuous characteristics of the Ethernet data, and restores the Ethernet data packet according to the packet flag.
  • the bandwidth of each Gigabit Ethernet data port is under various bandwidths. You can select the appropriate type of virtual container and SDH frame for SDH transmission according to actual needs, as long as these virtual containers are based on The virtual cascade protocol is cascaded together, so each virtual container can be processed and transmitted independently. For example, when the sum of the bandwidths of multiple Gigabit Ethernet data ports is less than L2Gbit / s, the virtual container that holds each channel of data can be the virtual container VC3. Of course, because the speed of VC3 is lower than VC4, a larger number of The virtual container cascade forms a virtual cascade virtual container.
  • mapping and de-mapping process for implementing the mapping and de-mapping process between the Gigabit Ethernet data packet and the SDH frame should be understood in a broad sense, and they should be regarded as capable of implementing the above-mentioned mapping of the invention
  • the hardware, software, or combination of demapper functions should be understood in a broad sense, and they should be regarded as capable of implementing the above-mentioned mapping of the invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

Procédé de mise en correspondance et de cessation de correspondance entre des paquets de données Gigabit Ethernet et une structure de trame SDH, qui présente les avantages d'une forte utilisation de la largeur de bande et d'un mode d'application souple. Pour le Gigabit Ethernet à ports multiples, lorsque le débit de transmission de données du port de transmission n'est pas plein, ledit procédé met en oeuvre un conteneur virtuel de cascade formé par une cascade virtuelle pour transporter les paquets de données Gigabit Ethernet à partir de divers ports. Les paquets de données sont transmis par des trames SDH multiples ou à faible débit, ce qui optimise la ressource de la largeur de bande. De plus, ces conteneurs virtuels sont indépendants les uns des autres, si bien que le nombre de conteneurs virtuels pour chaque adaptateur Gigabit Ethernet peut être attribué arbitrairement selon les besoins en largeur de bande, ce qui permet d'obtenir un système souple et pratique.
PCT/CN2003/000406 2002-06-24 2003-05-29 Procede de mise en correspondance et de cessation de correspondance entre des paquets de donnees gigabit ethernet et une structure de trame sdh Ceased WO2004002076A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003231572A AU2003231572A1 (en) 2002-06-24 2003-05-29 A mapping and de-mapping method between gigabit ethernet data packet and sdh frame structure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN02112201.6 2002-06-24
CN 02112201 CN1214569C (zh) 2002-06-24 2002-06-24 以太网数据包与sdh帧结构之间的映射和解映射方法

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WO2004002076A1 true WO2004002076A1 (fr) 2003-12-31

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CN100527747C (zh) * 2004-01-18 2009-08-12 华为技术有限公司 一种vc－12－xc任意级联的实现方法
DE102004003833B4 (de) 2004-01-26 2007-09-27 Infineon Technologies Ag Transceiver
CN100397848C (zh) * 2004-02-20 2008-06-25 华为技术有限公司 Lcas动态无损切换数据带宽的解映射方法
CN100391209C (zh) * 2004-02-20 2008-05-28 华为技术有限公司 Lcas动态无损切换数据带宽的映射方法
CN1319305C (zh) * 2004-03-19 2007-05-30 华为技术有限公司 减少lcas倒换中丢失报文的方法
CN1674478B (zh) * 2004-03-23 2011-07-20 华为技术有限公司 虚容器帧分析的方法及装置
CN1681233B (zh) * 2004-04-09 2010-12-08 华为技术有限公司 数据复用及虚级联的实现方法
CN100349390C (zh) * 2004-08-11 2007-11-14 华为技术有限公司 光传送网中传输低速率业务信号的方法及其装置
CN100344131C (zh) * 2004-08-16 2007-10-17 华为技术有限公司 调整弹性分组环网带宽的方法及装置
CN100373847C (zh) * 2004-12-14 2008-03-05 华为技术有限公司 在光传送网中传输低速率业务信号的方法
CN100426721C (zh) * 2005-06-30 2008-10-15 华为技术有限公司 充分利用宽带无线接入设备空口带宽的方法和装置
CN100440770C (zh) * 2005-07-22 2008-12-03 中兴通讯股份有限公司 一种回传虚级联组远端缺陷指示的方法
CN1859063A (zh) * 2005-08-29 2006-11-08 华为技术有限公司 业务数据传送方法及装置
CN101145875B (zh) * 2007-10-17 2011-05-11 中兴通讯股份有限公司 在sdh虚级联成帧器中实现多通道封装处理的方法和装置
CN102487346B (zh) * 2010-12-06 2014-12-10 中国移动通信集团广东有限公司 一种多业务传送平台的业务传输质量预测方法及装置
CN110635949B (zh) * 2019-09-30 2022-07-22 瑞斯康达科技发展股份有限公司 Sdh网元管理dcc的方法、管理卡、及存储介质
CN114466087B (zh) * 2022-02-21 2023-05-30 重庆奥普泰通信技术有限公司 数据传输方法、装置、设备以及存储介质

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WO2001097435A2 (fr) * 2000-06-15 2001-12-20 Tyco Telecommunications (Us) Inc. Systeme et procede d'application de signaux a une structure de donnees a longueur de trame fixe

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CN1464691A (zh) 2003-12-31
AU2003231572A1 (en) 2004-01-06
CN1214569C (zh) 2005-08-10

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