CN1507206A - Transmission method of circuit service in passive light network based on Ethernet - Google Patents

Transmission method of circuit service in passive light network based on Ethernet Download PDF

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CN1507206A
CN1507206A CN 02153928 CN02153928A CN1507206A CN 1507206 A CN1507206 A CN 1507206A CN 02153928 CN02153928 CN 02153928 CN 02153928 A CN02153928 A CN 02153928A CN 1507206 A CN1507206 A CN 1507206A
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circuit
service
ethernet
data
optical network
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CN 02153928
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CN1241363C (en
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羽 邓
邓羽
陈雪
李涛
孙曙和
刘冬
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北京格林威尔科技发展有限公司
北京邮电大学
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Abstract

The present invention relates to transmission method of circuit service in passive light network based on Ethernet, and realizing the comprehensive transmission of circuit service and Ethernet data service can reduce the construction, running and maintenance cost of access network. The transmission method includes writing the circuit service into buffering memory circuit and adapting circuit service data to the data area of the Ethernet MAC frame in the sending side; sending the MAC frame after obtaining sending bandwidth or time interval via transmission line; synchronizing circuit service clock with the fiber line terminal via independent service time label process in the light network unit of receiving side; unpacking to take circuit service data from the Ethernet MAC frame, write into buffer memory circuit and smoothen jitter introduced in data transmitting process; and finally outputting circuit service data in circuit service sync clock, specification and standard.

Description

电路业务在基于以太网的无源光网络上传输的方法 A circuit-based service transmission in an Ethernet passive optical network

技术领域 FIELD

本发明涉及通信技术领域,具体涉及电路业务在基于以太网的无源光网络(Ethernet Passive Optical Network,简写为EPON)中有效传送的方法。 The present invention relates to communication technologies, and particularly relates to a circuit-based traffic in the Ethernet passive optical network (Ethernet Passive Optical Network, abbreviated as EPON) effectively transmitted. 主要应用在EPON系统和其它以太网数据业务和电路业务综合传输的系统中。 Integrated transmission mainly used in an EPON system and Ethernet data services and other business systems circuitry.

背景技术 Background technique

电路业务包含一次群、二次群、三次群等业务,例如一次群的E1/T1等。 Circuit comprises a service group, second group, third group, and other services, for example, a group of E1 / T1 like. 电路交换业务对传输时延和时延抖动敏感,而现有的分组交换网不能满足传统电路业务对时延和抖动的要求。 Circuit switched traffic is sensitive to transmission delay jitter and delay, packet-switched network and the existing conventional circuit can not meet the business requirements for delay and jitter. 电路业务如何在分组网中有效传送,尤其是在EPON系统中的有效传送是一个急需解决的问题。 How effective transmission circuit service in the packet network, especially in the efficient transfer of EPON system is an urgent problem.

由于EPON系统承载的是以太网业务,所以在EPON系统中实现电路业务传送有很大的困难,实际情况是在现有的EPON技术方案中,均没有涉及电路业务的接入问题,也没有相应的设备投入使用。 Since the EPON system is carried Ethernet services, service transmission circuit is achieved with a great difficulty in the EPON system, the actual situation in the prior art EPON embodiment, there is no access problem relates to both circuit service, there is no corresponding the equipment put into use.

在分组交换网中提供电路业务方面,目前国际上研究较多的是在ISO模型三层(IP层)实现电路业务传输,在这方面国外已经有相应产品出现,但这种方式实现复杂,封装效率也不高,而致命的弱点是现阶段不能完全保证电路业务的服务质量(Quality of Service,简称QoS)。 Provide business circuit packet-switched network, the present study is to achieve more international traffic transmission circuit at the ISO model layer 3 (IP layer) in this regard foreign countries have corresponding products appear, but the way to achieve complex package efficiency is not high, but the fatal weakness at this stage can not guarantee the quality of service circuit service (quality of service, referred to as QoS).

EPON承载E1/T1等电路业务可以采用将电路业务直接映射到物理层传输的方案,但这样一来,物理层上就不再是纯粹的以太网帧,与传统的以太网环境无法兼容,这势必会影响以太网的应用范围。 EPON carrying E1 / T1 like the circuit service circuit service directly mapped to the physical layer transmission scheme may be employed, but this way, the physical layer is no longer a pure Ethernet frame, is not compatible with traditional Ethernet environment, It is bound to affect the range of Ethernet applications.

发明内容 SUMMARY

本发明的目的是设计一种电路业务在基于以太网的无源光网络上传输的方法,在基于以太网的无源光网络上,实现电路业务(如E1/T1)的接入,并有效传送电路业务,在提供以太网数据业务的同时提供电信级服务质量的电路业务,实现以太网数据业务、电路业务的综合传输接入,降低接入网的建设和运行维护成本。 Object of the present invention is a method of designing a circuit for service transmission in the Ethernet-based passive optical network, based on Ethernet passive optical network, the access circuit service (e.g., E1 / T1) and effectively transmission circuit business, providing carrier-grade quality of service while providing a circuit service at Ethernet data services, Ethernet data services, integrated circuit transmission access services, reduce access network construction and operation and maintenance costs.

实现本发明目的的技术方案是这样的:一种电路业务在基于以太网的无源光网络上传输的方法,是在由光纤线路终端、光分配网和多个光网络单元组成的以太网无源光网络上接入电路业务数据,包括由光纤线路终端至光网络单元的下行方向的信号传送,和由光网络单元至光纤线路终端的上行方向的信号传送,其特征在于:所述下行方向的信号传送包括以下处理步骤:A1.光纤线路终端利用业务时钟fs将电路业务数据封装到以太网MAC帧的数据区中,同时在以太网MAC数据帧中封装以太网源地址、目的地址和时间标签值1;A2.光纤线路终端根据分配给电路业务数据的带宽和发送时隙,进行电路业务数据MAC帧的发送;A3.光网络单元通过解封装处理从电路业务数据MAC帧中提取出电路业务数据;A4.光网络单元独立业务时间标签法,采用的时钟与系统时钟无关,利用 Achieve the object of the present invention is a technical solution: A method for service transmission circuit in the Ethernet-based passive optical network, the Optical Line Termination in an optical distribution network and a plurality of optical network units without Ethernet the network access circuitry service data source light including signal light transmitting the downlink direction from the network unit to the optical line terminal, and the signal transmitted by the optical network unit to the upstream direction of the optical line terminal, wherein: the downlink direction signal transmission comprising the following processing steps:. A1 optical line terminal by using a service clock fs circuit encapsulated service data to the data area of ​​the Ethernet MAC frame, while the encapsulated Ethernet MAC source address in the Ethernet data frame, a destination address, and time tag value 1; A2 optical line terminal and the bandwidth allocated to the service data transmission time slot circuit, the MAC frame transmitted service data in accordance with the circuit;.. A3 optical network unit extracts the service data from the circuit MAC frame by the decapsulation processing circuit service data;. A4 optical network unit time labeling service independently using independent clock of the system clock, using 间标签值1生成与光纤线路终端的业务时钟fs同步的业务时钟fs2,输出提取出的电路业务数据;所述下行方向的信号传送包括以下处理步骤:B1.光网络单元利用业务时钟fs2将电路数据封装到以太网MAC帧的数据区中,同时在以太网MAC数据帧中封装源地址和目的地址;B2.光网络单元根据分配给电路业务的带宽和发送时隙,进行电路业务数据MAC帧的发送;B3.光纤线路终端通过解封装处理从电路业务数据MAC帧中提取出电路业务数据;B4.光纤线路终端利用业务时钟fs,输出提取出的电路业务数据。 Generating a tag value between the Optical Line Terminal service clock synchronization service clock fs fs2, the circuit outputs the extracted service data; transmitting the downlink signals comprises the following processing steps: B1 optical network unit using the service clock circuit fs2. encapsulating the data into the data area of ​​the Ethernet MAC frame, and the package source and destination addresses in the Ethernet MAC data frame;. B2 optical network unit to a circuit bandwidth and traffic transmission slot, a circuit according to MAC frame allocation service data transmission;. B3 extracted by the optical line terminal circuit decapsulation process traffic data from MAC service data frame circuit;. optical line terminals B4 using the service clock fs, outputs the extracted circuit data service.

本发明综合考虑了下述两种情况:EPON承载电路业务的目的是实现远端光网络单元(Optical Net Unit,简称ONU)与局端光纤线路终端(OpticalLine Terminal OLT)之间电路业务的透明传输,并不要求电路业务穿透城域网;在物理层接入电路业务则兼容性不好,而在IP层接入电路业务又不能保证电路业务的QoS(如背景技术中说明的),提出在二层传输电路业务。 The present invention considers the following two cases: EPON object of bearer services is achieved distal optical network units (Optical Net Unit, referred to as ONU) transparent transmission circuit traffic between the central office and the optical line terminal (OpticalLine Terminal OLT) , the circuit is not required to penetrate the MAN service; poor compatibility in the physical layer service access circuit, and an access circuit in the IP layer can not guarantee QoS service circuit service (such as described in the background art), is proposed in the transmission circuit Layer traffic.

本发明的在二层传输电路业务的方法,即在发送端将电路业务数据封装成标准的以太网帧(电路数据MAC帧),与承载数据业务的其他以太网帧统一传输,再依靠区分业务优先级的动态带宽分配算法,或按连接配置保证带宽的静态带宽分配算法,来保障电路业务质量(QoS);在接收端,对电路数据MAC帧进行解封装处理,从而恢复出电路数据。 In the method of the present invention Layer traffic transmission circuit, i.e. the circuit on the transmitting side service data encapsulated into a standard Ethernet frames (MAC frames circuit data), the unified transfer with other Ethernet frames carrying data traffic, to rely on DiffServ priority dynamic bandwidth allocation algorithm according to the connection configuration or static bandwidth allocation algorithm guaranteed bandwidth to guarantee quality of service circuits (the QoS); at the receiving end, the data circuit decapsulates the MAC frame processing circuit to recover the data. 本发明方法,采用独立业务时间标签法实现电路业务的同步,在OLT侧设备中,通过在电路数据MAC帧同时封装时间标签值1,和在ONU侧设备中利用该时间标签值1生成与OLT侧设备的业务时钟fs同步的业务时钟fs2,解决了传送电路数据MAC帧在两端点间的同步与定时。 The method of the present invention, a synchronous implementation circuit service independent business hours labeling, the OLT-side apparatus by simultaneously encapsulating the time tag value 1, and by using the time stamp value of 1 generates the OLT at the ONU side of the apparatus in the circuit data MAC frame fs2 business service clock fs clock synchronization device side, the data transfer circuit to solve the MAC frame timing synchronization between the two endpoints.

本发明采用的方法能够确保电路业务的服务质量,电路业务接口的技术性能指标能满足国内外相关规范要求。 The method of the present invention can be employed to ensure the quality of service circuit service, technical service interface circuit performance to meet relevant specifications abroad. 基于以太网的无源光网络中的带宽分配控制部分分配带宽,保证电路业务在传送过程中不受其他以太网数据帧的影响。 Ethernet Passive Optical Network bandwidth allocation in a bandwidth allocation control section, to ensure that traffic is not affected by other circuit Ethernet data frame during transmission based. 本发明的方法可应用在EPON系统和其他以太网数据业务和电路业务综合传输的系统中,而且,在能够提供本发明同步方法的任何基于以太网的网络中,也都能应用本发明的技术方案。 The method of the present invention may be applied in other systems, and EPON Ethernet data transmission services and integrated circuit business systems, and, in the synchronization method of the present invention to provide any of the techniques of the present invention is an Ethernet-based network, but also can be applied Program.

附图说明 BRIEF DESCRIPTION

图1是在EPON中局端(OLT侧)电路业务接入部分的位置示意图; 1 is a schematic position EPON central office (OLT side) of the service access part of a circuit;

图2是在EPON中远端(ONU侧)电路业务接入部分的位置示意图;图3是电路业务接入在EPON中的一种实现流程示意图;图4是本发明采用独立业务时间标签法实现电路业务在端点间定时同步的机制与原理示意图。 FIG 2 is a schematic view of a position (ONU-side) portion of the service access EPON distal circuit; FIG. 3 is a circuit service access A schematic flow diagram of an EPON implemented; FIG. 4 is implemented using the present invention, an independent service time tagging service mechanism and principle of the circuit timing synchronization between the endpoints of FIG.

具体实施方式 detailed description

电路业务接入是由用户端的业务接入端口和局端的业务端口共同完成的,这两个端口存在一种对应关系,不同的对应关系对应不同的连接,这样,局端就可以方便地进行配置连接了。 Is a service access circuit access port and a central office service client service ports have completed, the two ports there is a correspondence between different correspondence relationship corresponding to a different connection, so that the central office can be easily arranged connected. 对于电路业务,根据业务两个端点的对应关系可分配以太网源地址和目的地址。 For circuit traffic, may assign the Ethernet source and destination addresses according to the two end points of correspondence between a service.

在发送端,将进入EPON中的电路业务数据写入缓存电路,按固定的周期对电路数据进行以太网MAC封装,经封装过程将电路业务数据适配到以太网MAC(Media Access Control,介质访问控制层,是以太网数据链路层的一个子层)帧的数据区中;包含电路数据的以太网MAC帧经过交换芯片的交换过程到达发送端口,获得本周期的发送带宽(或时隙)后,经过传输线路发送到接收端。 In the transmitter, the circuit will enter the EPON traffic data write cache circuit, a fixed period of circuit data Ethernet MAC encapsulation, the encapsulated service data during the adaptation circuit to the Ethernet MAC (Media Access Control, media access control layer, the data area is a sub-layer Ethernet data link layer) frame; Ethernet MAC frame contains data through a circuit switching exchange chip arrives in a transmission port, the transmission bandwidth is obtained at the present period (or slot) after sending to the receiving end via the transmission line.

在接收端,通过交换芯片或通过目的地址的查找,确定此封装有电路数据的MAC帧对应的处理单元,并发送给此处理单元;然后进行解封装的处理过程,将封装在以太网MAC帧中的电路业务数据提取出来,写入缓存处理电路,对数据传送过程引入的抖动进行平滑;最后按与发送端同步的电路业务时钟,并按相应的电路业务规范和标准连续地将数据输出。 At the receiving end, or by exchanging the chip by destination address lookup, encapsulating the MAC frame to determine this unit circuit corresponding to the processing data, and sends this processing unit; process then decapsulated, encapsulated in Ethernet MAC frames the extracted circuit data service, the write cache processing circuit, data transfer jitter introduced by smoothing process; press the transmitting side in synchronization with the clock circuit service, according to the corresponding circuit operational norms and standards are continuously output the data. 通过这些过程,实现电路业务在EPON中的透明传输。 Through these processes, transparent transmission circuit in the EPON traffic.

参见图1、图2,说明电路业务接入部分在EPON中的位置。 Referring to FIG. 1, FIG. 2, the service access position of the circuit portion in the EPON. OLT侧采用图1所示的结构方式,EPON的OLT侧主要包括有CPU模块11、交换模块12、光信号(PON接口)与以太网信号(以太网接口)间的PON接口模块与系统控制模块13,和以太网接口模块(千兆/百兆以太网接口与以太网接口)14,本发明的电路业务接入部分15将多路电路数据传送给交换模块12,电路业务接入部分15主要包括电路接口模块、电路业务适配模块和以太网接口模块等功能模块,与模块13间通过电路业务同步模块取得电路业务同步。 The OLT using the configuration shown in FIG. 1 embodiment, the EPON OLT side mainly includes a CPU module 11, switching module 12, the optical signal (PON interface) system with PON interface module between the Ethernet signal (Ethernet interface) control module 13, 14 and Ethernet, the circuit part of the present invention, the service access will multiplex circuit 15 data transfer interface module (Gigabit / Fast Ethernet interface Ethernet interface) 12 to the switch module, the main circuit service access portion 15 an interface module includes a circuit, the circuit module and the service adaptation module Ethernet interface function module, and the module 13 by the synchronization acquisition circuit service circuit service synchronization module. ONU侧电路业务接入部分的设计可以完全与OLT侧的设计相同,也就是采用图1中所示的结构。 Design of ONU service access side parts of the circuit may be completely identical with the design of the OLT side, i.e. the configuration shown in FIG. 但在具体实现过程中,为了降低ONU侧的成本,可以采用图2所示的结构,在图2所示的ONU侧结构中没有交换模块12。 But in the specific implementation process, in order to reduce the cost of the ONU side, the structure may be employed in FIG. 2, no switching module 12 at the ONU side of the structure shown in FIG. 2.

电路业务接入部分15直接映射到以太网物理(MAC)层,发送电路业务数据,和将包含电路业务数据的MAC帧中的有效数据提取出来发送给电路接口模块。 Service access part of the circuit 15 directly mapped to the Ethernet physical (MAC) layer service data transmission circuit, and the MAC frame will contain valid data circuit service data extracted from the transmission circuit to the interface module. PON接口模块负责与光纤间以太网MAC帧的收发;电路业务同步模块实现ONU侧的电路业务时钟与OLT侧同步。 PON interface between the optical fiber and a transceiver module is responsible for Ethernet MAC frames; circuit module implemented ONU side service synchronization service clock circuit synchronized with the OLT.

参见图3,图中示出本发明方法所涉及的主要功能模块及其实现的具体流程。 Specific flow Referring to Figure 3, there is shown the main functional modules of the method according to the present invention and its implementation. EPON系统包括OLT侧设备18、光分配网(ODN)10和多个ONU侧设备20。 EPON system includes 18, 10 and a plurality of side device ONU Optical Distribution Network (ODN) OLT apparatus 20 side.

OLT侧18及ONU侧20所共有的结构,包括电路业务接口处理模块1、14,适配封装处理部分2、17,同步与时钟处理电路3、12,电路业务控制与OAM(操作与管理)模块4、16,发送控制电路5、15,发送相关处理电路6、19,解封装处理部分7、13,以太网接收处理电路9、11,其中OLT侧18还包括一交换处理部分8。 18 and the side 20 ONU OLT side common structure, including a circuit service interface processing module 1,14, 2,17 fitting part encapsulation processing, synchronized with the clock processing circuit 3, 12, and a control circuit service OAM (Operations and Management) 4,16 module, a transmission control circuit 5, 15, sends the relevant processing circuitry 6,19 decapsulation processing section 7, 13, 9, 11 Ethernet receive processing circuit, wherein the OLT 18 further comprising a switching processing section 8.

系统初始化后,OLT侧的电路业务控制与OAM模块4、ONU侧的电路业务控制与OAM模块16负责与系统网管的通信和消息处理,根据系统网管的要求配置适配封装处理部分2和17,将OLT与ONU两端开通电路业务的端口通过以太网源地址和目的地址的形式连接起来,并处理告警等其它OAM信息。 After system initialization, the OLT side of the circuit service control OAM module 4, the network management system 16 is responsible for the ONU side of the circuit service control OAM communications and message processing module, adapted to configure the package 2 and the processing section 17 according to the requirements of the network management system, OLT and ONU port open ends connected by a circuit service form the Ethernet source and destination addresses of up, processing and other OAM alarm information. 如此,适配封装处理部分2、17,根据获得的源以太网地址和目的地址就可将电路数据封装到以太网MAC帧中。 Thus, the package processing section adapted 2,17, circuit data can be encapsulated into an Ethernet MAC frame obtained according to the Ethernet source and destination addresses.

封装的以太网源地址和目的地址,是在系统初始化时,由系统网管根据光纤线路终端和光网络单元两端点间电路业务的对应关系通过系统软件进行分配的,并保存在光纤线路终端和光网络单元中的本地存储器中。 Ethernet source and destination addresses of the package, when the system is initialized, by the system network in accordance with the correspondence between the Optical Line Terminals and two end points of the optical network unit circuit services by the system software distribution, and stored in the optical line terminal and an optical network unit the local memory. 在系统正常运行阶段,网管也可以通过同样的方法,对光纤线路终端和光网络单元两端点间电路业务的对应关系进行调整或重新配置。 In the normal operation phase of the system, network management can be, for correspondence between the Optical Line Terminals and two end points of the optical network unit service circuit is adjusted by the same method or reconfiguration.

如图所示,由OLT下行发送电路(设备18中的部分电路)和ONU下行接收电路(设备20中的部分电路)以及光分配网(ODN)10完成下行方向的信号传送,即OLT侧至ONU侧方向的信号传送。 As shown, the downlink signal is transmitted by the OLT to complete downlink transmission circuit (circuit arrangement portion 18) and the downstream ONU receiving circuit (the circuit device portion 20) and an optical distribution network (ODN) 10, i.e., the OLT to signal transmission direction side ONU.

该信号传送过程是:电路数据经过电路业务接口处理模块1进入EPON的OLT侧设备18;适配封装处理部分2从1获得电路数据,1->2;在适配封装处理部分2,在电路业务控制与OAM模块业务时钟fs的控制下,电路数据先缓存一个封装周期的时间T,然后将这些数据封装到以太网MAC帧的数据区中。 The signal transmission process: a circuit data service via the interface circuit 1 into the processing module 18 of the EPON OLT side apparatus; adaptation circuit package data processing section 2 is obtained from 1, 1- & gt; 2; package in the adaptation processing section 2, in the service control OAM control circuit module of the service clock fs, a buffer circuit to the package data period of time T, the data is then encapsulated into the data area of ​​the Ethernet MAC frame. 封装过程中要从本地存储器中读取初始化时写入的地址映射信息,将源地址和目的地址写入MAC帧中;将MAC数据区长度值写到以太网MAC帧的长度/类型字节;将同步与时钟处理电路3产生的时间标签值1封装到MAC帧中;计算并插入帧校验序列(FCS);最后将按以太网MAC帧的定义形式封装的MAC数据帧发送给交换处理部分8,2->8。 Packaging process local memory addresses written in the mapping information read from the initialization, the source address and destination address is written in the MAC frame; the MAC value is written to the data region length Ethernet MAC frame length / type byte; time tag value synchronized with a clock generated by a processing circuit 3 encapsulated into the MAC frame; and calculating interpolation frame check sequence (the FCS); final package will be defined in the form of Ethernet MAC frames of a MAC frame to a data exchange process section 8,2- & gt; 8.

在EPON中实现电路业务的接入,必须保证电路业务在接收和发送两端的定时同步。 Access service circuit implemented in EPON, must ensure that the timing synchronization circuit service and receiving ends of the transmission. 实现定时同步的基本方法是时间标签值法,在具体实现时可以有两种不同的应用形式:一种是直接对单路的电路业务提供时间标签值,对每一路业务分别进行同步处理;另外一种是将接入的多路电路业务复用为高次群的业务(例如,将4路E1复用为8Mbit/s的二次群),对高次群采用时间标签值法实现定时同步,这样进行多路复用的电路业务和对端分接恢复的电路业务也就实现了定时同步;在交换处理部分8,在电路业务控制与OAM模块4的控制下,根据目的MAC地址,将不同的以太网数据交换到不同的端口(将封装了电路数据的MAC帧交换到某一端口,以区别没有封装电路数据的其他MAC帧),将封装了电路数据的MAC帧发送到发送控制电路5,8->5;发送控制电路5,根据分配给电路数据的带宽和发送时隙将数据发送到发送相关处理电路6,5->6。 The basic method implemented timing synchronization method that the time tag value, when the specific implementation of the application can have two different forms: a direct circuit to provide time stamp values ​​of one-way traffic, traffic on each path to synchronize respectively; Further One is the access multiplexer circuit service multiplex for the business higher group (e.g., the four E1 multiplexed into the second group of 8Mbit / s) and for higher order group to achieve timing synchronization using the time tag value method, so that multiple multiplexing circuit service and a service access end subcircuits will recover to achieve timing synchronization; exchange processing section 8, under the control of the service control and OAM circuit module 4, according to the destination MAC address, different Ethernet exchange of data to different ports (the encapsulated MAC frame data switching circuit to a port, to distinguish between no other circuit encapsulated MAC frame data), circuit data encapsulated MAC frame to the transmission control circuit 5,8- & gt; 5; transmission control circuit 5, the bandwidth and transmission time slot circuit to transmit data to the data related to the transmission processing circuit according to the allocation 6,5- & gt; 6. 电路业务的QoS主要通过带宽保证和其它一些辅助措施实现的。 QoS circuit business mainly through guaranteed bandwidth and other support measures implemented. 其中的带宽保证,采用动态带宽分配机制的EPON系统,在OLT侧所有的下行数据中,封装了电路业务的以太网MAC帧(简称电路业务数据MAC帧)的优先级最高,发送的优先级也最高,当发送控制电路5检测到有电路业务数据MAC帧时,查看发送缓冲区是否有数据正在发送,如果没有数据发送,则开始发送电路业务数据MAC帧;如果有数据正在发送,对当前传送帧不进行截断,待该帧发送完毕后,即发送电路业务数据MAC帧。 Wherein the bandwidth guarantee, EPON system using dynamic bandwidth allocation mechanism, the OLT, all downlink data in the Ethernet MAC frame encapsulated circuit service (referred to service data circuit MAC frame) is the highest priority, transmission priority may also the highest, when the transmission control circuit 5 detects the circuit MAC service data frame, to see whether the transmit buffer data is being sent, if no data is sent, the transmission circuit starts the MAC service data frame; if data is being sent, the current transmission no truncation frame, until the frame has been sent, i.e. traffic data transmission circuit MAC frame.

发送相关处理电路6,进行并/串转换、8B/10B编码处理以及电/光转换后,送到光分配网(ODN)10,6->10,最后传输到ONU侧设备20的以太网接收处理电路11中,10->11;以太网接收处理电路11,在电路业务控制与OAM模块的控制下,将不同业务类型的数据转发到不同的模块(用于区别没有封装电路数据的其他MAC帧和封装了电路数据的MAC帧),将封装了电路数据的MAC帧转到解封装处理部分13,11->13,和提取出OLT例的时间标签值1送同步与时钟处理电路12;解封装处理部分13,在电路业务控制与OAM模块的控制下,从MAC帧中提取出有效的电路数据,先将这部分数据发送给本地存储器作缓存,通过缓存属于相邻周期的数据来平滑抖动;然后利用同步与时钟处理电路12提供的和OLT侧同步的电路业务时钟(fs2),顺序从本地存储器中读取,并输出给电路业务接口处理模块14,13-> After sending the relevant processing circuit 6 performs parallel / serial conversion, 8B / 10B encoding process and the electrical / optical conversion, to the light distribution (ODN) 10,6- & gt network; 10, and finally transmitted to the Ethernet device 20 side ONU reception processing circuit 11, 10- & gt; 11; Ethernet reception processing circuit 11, under control of the control circuit and OAM service module forwards the data to a different service types of different modules (not packaged circuit for distinguishing data other MAC frame and the MAC frame encapsulated circuit data), encapsulating the circuit data to a MAC frame processing section decapsulating 13,11- & gt; 13, and extracts the time stamp value of the OLT Example 1 synchronized with a clock transmission process 12 circuit; decapsulation processing section 13, under control of the control circuit and OAM service module, extracts circuit data from valid MAC frame, this first part of the data to the local memory as a cache, a cache by periods belonging to adjacent jitter smoothing data; and synchronous with the clock processing circuit 12 and the OLT clock synchronization circuit service (FS2), are sequentially read from the local memory, and outputs it to the service interface processing circuit module 14,13- & gt; 14;电路业务接口处理模块14,将电路数据通过相应的端口输出,从而完成电路数据在EPON系统中的下行透明传送。 14; service interface processing module circuit 14, the circuit through the corresponding data output port, thereby completing the transparent transmission of downlink circuit data in the EPON system.

如图3中所示,由ONU上行发送电路(设备20中的部分电路)和OLT上行接收电路(设备18中的部分电路)以及光分配网(ODN)10完成上行方向的信号传送,即ONU至OLT方向的信号传送。 As shown in FIG. 3, the uplink transmission by the ONU circuit (part of the circuit device 20) and the OLT of the receiving circuit (the circuit device portion 18) and an optical distribution network (ODN) in the uplink direction transmission completion signal 10, i.e. ONU the signal transmitted to the OLT direction.

电路数据经过电路业务接口处理模块14进入EPON的ONU侧设备20,适配封装处理部分17从14获得电路业务数据,14->17;在适配封装处理部分17,在电路业务控制与OAM模块的控制下,电路数据缓存一个封装周期的时间T,然后将这些数据封装到以太网MAC帧的数据区中。 Circuit data service via the interface circuit 14 into the processing module of the ONU EPON side apparatus 20, the package processing section 17 is adapted to obtain traffic data from the circuit 14, 14- & gt; 17; in the packaging process fitting portion 17, the OAM control circuit service the control module, a data buffer circuit package cycle time T, the data is then encapsulated into the data area of ​​the Ethernet MAC frame. 封装过程中要从本地存储器中读取初始化时写入的地址映射信息,将源地址和目的地址写入MAC帧中;计算并插入帧校验序列(FCS);利用同步与时钟处理电路13产生的业务时钟(fs2),按以太网MAC帧的定义形式封装后的电路数据MAC帧由适配封装部分17发送给发送控制电路15,17->15;发送控制电路15根据分配给电路数据的带宽和发送时隙传送包含电路数据的MAC帧到发送相关处理电路19,15->19。 Packaging process local memory addresses written in the mapping information read from the initialization, the source address and destination address is written in the MAC frame; and calculating interpolation frame check sequence (the FCS); generating a synchronous clock processing circuit 13 the service clock (fs2), the circuit is defined by the encapsulated data in the form of Ethernet MAC frames transmitted from the MAC frame sealing portion 17 is adapted to the transmission control circuit 15,17- & gt; 15; transmission control circuit 15 to the circuit data according to the allocation MAC transmission bandwidth and transmission time slot containing circuit data frames to the transmission processing circuit associated 19,15- & gt; 19. 在ONU上行发送过程中,通过带宽分配机制保证电路数据MAC帧发送带宽,获得所分配的带宽后将电路数据MAC帧发送给OLT。 In the ONU upstream transmission, the bandwidth allocation mechanism to ensure that the circuit through the MAC frame data transmission bandwidth allocated bandwidth obtained after the circuit data transmitted MAC frame to the OLT. 在采用静态带宽分配的EPON中,按连接配置处理电路业务,也就是将电路业务的带宽固定下来,实现系统同步后OLT与ONU电路数据MAC帧发送时刻固定,这样,电路数据MAC帧可以周期性发送,这是一种很强的QoS保证措施。 In EPON uses static bandwidth allocation, traffic processing circuit according to the connection configuration, i.e. the service bandwidth fixed circuit, for system synchronization circuit OLT and the ONU MAC data frame transmission timing is fixed so that the circuit data may be periodically MAC frame send, which is a strong QoS assurance measures. QoS保证的其它措施包括:电路数据MAC帧在交换芯片处有最高优先级,优先级是通过插入虚拟局域网(VLAN)优先级实现的,电路数据MAC帧到达接收端解封装后,在存储器中缓存一定时间,对以太网包形式传送方式带来的抖动进行平滑,将时延抖动完全平滑掉;发送相关处理电路19,进行并/串转换、8B/10B编码处理以及电/光转换后,送到光分配网(ODN)10,19->10,最后传输到OLT侧设备18上行接收电路的以太网接收处理电路9,10->9;以太网接收处理电路9实现以太网物理层处理,然后将处理后的数据发送到交换处理部分8,9->8;经交换处理部分8,在电路业务控制与OAM模块的控制下,封装有电路数据的MAC帧被交换到解封装处理部分7,8->7;解封装处理部分7,在电路业务控制与OAM模块的控制下,从MAC数据帧中提取出有效的电路数据,并将这部分数据发送给本 Other measures QoS guarantee includes: a circuit data in the MAC frame has the highest priority in the switching chip, the priority level is achieved by inserting a virtual LAN (VLAN) priority, circuit data MAC frame after reaching the receiving end decapsulates the cache memory a certain time, Ethernet packets transmitted in the form of embodiment jitter caused by smoothing, to smooth out the delay jitter completely; after sending the relevant processing circuit 19 performs parallel / serial conversion, 8B / 10B encoding process and the electrical / optical conversion, send the optical distribution network (ODN) 10,19- & gt; 10, and finally to the transmission side apparatus OLT receiving circuit 18 receives an uplink Ethernet processing circuit 9,10- & gt; 9; 9 a processing circuit receiving the Ethernet physical layer Ethernet process, and then sends the processed data to the exchange processing section 8,9- & gt; 8; the exchange processing section 8, under the control of the service control and OAM circuit module, encapsulated MAC frame data is switched to the circuit decapsulated processing section 7,8- & gt; 7; decapsulating processing section 7, under the control of the service control and OAM circuit module, extracts circuit data from valid MAC data frame, and transmits this data to a part of the present 存储器缓存,通过缓存不同周期的数据来平滑时延抖动;然后利用同步与时钟处理电路3提供的业务时钟(fs),顺序从存储器中读取数据,并输出给电路业务接口处理模块18,7->18;电路业务接口处理模块18将电路数据通过相应的端口输出,从而完成电路数据在EPON系统中的上行透明传送。 Cache memory, the cache data of different cycles to smooth the delay jitter; synchronous then sequentially read data from the memory and clock processing circuit 3 provides service clock (FS), and outputs it to the interface circuit service processing module 18,7 - & gt; 18; service interface circuit to circuit data processing module 18 through the corresponding port output, thereby completing the circuit data in the uplink transmission transparent EPON system.

图4中示出本发明利用独立业务时间标签法实现电路业务在两个端点(OLT与OUN)间同步的原理。 FIG. 4 shows the principles of the present invention implemented with a separate operational time tagging circuit services between the two endpoints (OLT and OUN) synchronization. 该独立业务时间标签法所采用的时钟与系统时钟无关。 The independent service time stamp method used independent of and system clocks. 在EPON中,各个ONU的电路业务时钟应同步于OLT侧的电路业务时钟。 In the EPON, each ONU shall be synchronized to a clock circuit service circuit service clock of the OLT.

OLT侧设备的同步与时钟处理电路3的结构,包括OLT电路业务时钟(fs)产生电路41,倍频器(产生时间标签值1的时钟)42,计数器43,时间标签值1读取发送电路45和时间标签值1发送控制电路44;ONU侧设备的同步与时钟处理电路的结构,包括ONU电路业务时钟(fs2)产生电路51,本地时钟(fts2)产生电路52,可控计数器53(产生时间标签值2),分频控制器54,时间标签值1与时间标签值2的差值计算电路55和时间标签值1的接收处理电路56。 Structure synchronized with the clock of the OLT 3 side processing circuit apparatus, including a circuit service OLT clock (fs) generation circuit 41, a multiplier (generating the time stamp value of the clock 1) 42, a counter 43, a read time stamp value transmission circuit 45 and a time stamp value of the transmission control circuit 44; configuration synchronized with the clock processing circuit side device ONU, ONU comprises a clock circuit service (FS2) generation circuit 51, a local clock (FTS2) generating circuit 52, a controllable counter 53 (generated time tag value 2), frequency division controller 54, the time tag value circuit 55 and the time stamp value of the reception processing circuit 56 and the time difference between the two calculated tag value.

时间标签值1是通过读取计数器43的输出值获得的,此计数器43的驱动时钟是业务时钟频率(fs)的正整数倍(fts),每个时钟周期计数器43计数一次,形成时间标签值1(OLT时间标签timestamp))。 Time tag value 1 is obtained by reading the output value of the counter 43, the counter 43 is driven clock service clock frequency (fs) a positive integral multiple (FTS), the counter 43 counts every clock cycle time, the time tag value is formed 1 (OLT time stamp timestamp)).

实现同步的基本原理是:OLT侧利用业务时钟fs进行倍频,得到时间标签时钟fts;某一8位计数器43计算fts时钟经过的周期数,生成时间标签值1,在时间标签值1发送控制电路44的控制下,由读取发送电路45将时间标签值1发送给ONU侧。 The basic principle is to achieve synchronization: OLT side using the service clock fs frequency doubling to obtain time stamp clock fts; a 8-bit counter 43 calculates the number of elapsed clock cycles fts generates a time stamp value, a time stamp value in the transmission control 1 under the control circuit 44, the time tag value 45 transmitted by the reader 1 to the ONU transmission circuit side. 时间标签值1的发送可以通过专门的MAC帧传送,也可以和包含电路数据的MAC帧或其它网管类MAC帧一起传送;在ONU侧设备电路板上有fts2本地时钟,fts2与时间标签1时钟fts的标称频率相同,通过一个分频控制器54控制对fts2分频时的分频数得到业务时钟fs2;同时存在一个8位可控计数器53,由本地时钟fts2驱动,此可控计数器53,输出生成ONU侧的时间标签值2;当ONU侧设备通过接收处理电路56接收到OLT侧的时间标签值1时,读取本地时间标签值2,时间标签差值计算电路55对这两个数值进行比较获得差值,利用该差值将ONU可控计数器53的值置为与时间标签值1相同;同时将比较后的差值送给分频控制器54,分频控制器54根据差值获得调整分频控制器54分频的具体参数,控制分频数,获得业务时钟fs2,实现ONU与OLT侧的电路业务时钟fs与fs2的同步。 Transmission time tag value 1 may be transmitted through a dedicated MAC frame may be transmitted together with MAC frame includes a circuit-based data network or other MAC frame; FTS2 local clock with a circuit board of the ONU side, the time stamp clock FTS2 fts same nominal frequency, by a frequency division controller 54 controls the frequency division number at the time of dividing the frequency of the service clock fts2 FS2; 53, driven by the presence of a local clock fts2 8 simultaneously controllable counter, this counter 53 controlled , the output side generates time stamp values ​​ONU 2; when the ONU-side reception device via a processing circuit 56 receives the time stamp value of the OLT 1, 2 reads the local time tag value, the time difference calculating circuit 55 label the two comparing the difference value obtained by the same ONU to the difference value is set to a controllable counter 53 and a time stamp value; while the difference after the comparison to the frequency division controller 54, the controller 54 in accordance with a difference frequency division adjusting the values ​​obtained 54 minutes frequency division controller parameters specific frequency, frequency division number control, the service clock is obtained FS2, achieve the service clock fs circuit and fs2 ONU synchronized with the OLT.

下面以E1电路信号的传送为例,进一步说明本发明技术方案的将电路数据封装在MAC帧中形成电路数据MAC帧的过程。 E1 circuits to transmit signals following example, the data further illustrate the process of the circuit MAC frame data circuit packaging technology of the present invention is formed in the MAC frame. 有两种实现方式:第一种方式:在发送端,对于每一路E1分别进行以太网MAC封装;封装后的E1数据帧(封装了E1数据的以太网MAC帧)经过交换处理部分(8)交换芯片的交换过程和OLT与ONU间的线路(10)后,到达接收端;在接收端,对封装后的E1数据帧进行解封装,提取E1有效数据,做缓存处理;然后利用与发送端同步的业务时钟将E1发送出去。 Implemented in two ways: The first way: on the transmitting side, for each channel separately Ethernet MAC encapsulation E1; E1 data frame is encapsulated (encapsulating Ethernet MAC frame data E1) through the exchange processing section (8) line between the exchange switching chip and the OLT and the ONU (10) arriving at the receiving end; receiving end of E1 data frame is encapsulated decapsulates the extract E1 valid data, do caching; then using the transmitting end business synchronous clock E1 sent. 这种方式对每一路E1都要分别提供同步业务时钟,采用时间标签值法实现同步;如果某几路E1数据来自同一个交换机,那么这几路E1数据可以共用一路同步业务时钟。 In this manner each channel E1 clock to be synchronous services are provided, the tag value using the time synchronization method; if a few channels of E1 data from the same switch, then these data can be shared channel E1 clock synchronous traffic way.

第二种方式:这种方式利用二次群处理芯片,将4路E1复用为一路8.448Mbit/s的二次群数据流,然后对此二次群数据流进行以太网封装(以下简称此MAC帧为E1数据帧)。 The second embodiment: in this way the use of the second group of processing chips, the four E1 multiplexed data stream all the way to the second group of 8.448Mbit / s, and then this second group of encapsulated Ethernet data stream (hereinafter referred to in this E1 data frame is a MAC frame). 这种方式只要求在8.448Mbit/s的信号上实现同步,就能够保证各路E1在EPON的OLT侧和ONU侧是同步的,采用时间标签值法实现OLT与ONU的8.448Mbit/s二次群数据的同步。 This only requires synchronization signal on the 8.448Mbit / s, it is possible to ensure that each E1 the OLT and the ONU of the EPON side are synchronized using 8.448Mbit / s Secondary OLT and the ONU to realize a time tag value method data synchronization group. 按连接配置处理时,分配好带宽后,发送位置固定。 Press connection configuration processing, the good distribution of bandwidth, transmit a fixed position. E1数据帧在交换芯片处有最高优先级,优先级是在交换芯片的端口插入虚拟局域网(VLAN)优先级实现的。 E1 data frame with the highest priority exchange chip, the priority is an insertion port switch chip virtual local area network (VLAN) priority achieved. OLT或ONU接收到对端的E1数据帧后,进行解封装处理,提取出二次群数据后写入存储器缓存,缓存一定的时间,进行时延抖动的平滑;利用与发送侧同步的8.448MHz时钟,从缓存区中将8.448Mbit/s的数据写入二次群处理电路,再由二次群处理电路恢复4路E1数据。 OLT or ONU E1 data frame after receiving peer, decapsulating process, after writing the second group of the extracted data memory cache, cache a certain time, a delay jitter smoothing; 8.448MHz clock synchronization using the transmission side , and then restore four E1 data by a processing circuit in the second group of buffer 8.448Mbit / s data processing circuit writing the second group.

此时,二次群做MAC封装时用到的源地址和目的地址,是网管通过系统软件配置时获得的。 At this time, the package used doing source address and destination MAC address of the second group, are obtained when the network configuration through system software. 由网管配置OLT与ONU两端的电路业务端口对应关系,配置后,将端口的源MAC地址和对应的目的MAC地址发送给相应处理电路。 The corresponding relationship between port network management configuration circuitry OLT and ONU service ends, after configuration, the transmission source MAC address and destination MAC address corresponding to the port corresponding processing circuit.

本发明的方法是在以太网MAC层实现电路业务的接入技术,是EPON系统多业务接入的重要组成部分,在技术上实现了EPON系统中电路交换业务在分组网中的传输问题,满足电路业务的时延和时延抖动要求,解决了同步定时问题,在无连接的分组网中提供电信服务质量的电路业务。 The method of the present invention is an access technology circuit services in the Ethernet MAC layer, it is an important part of the multi-service access EPON system, the technical realization of the circuit switched traffic transmission problems in the EPON system packet network to meet delay and jitter requirements of the circuit business to solve the problem of synchronization timing, providing quality telecommunications services to business circuit packet network without connection. 本发明中的方案设计及其主要模块具有重用性,兼容OLT和ONU两侧、兼容静态带宽分配算法(SBA)和动态带宽分配算法(DBA)的EPON系统,兼容EPON系统和其它以太网、电路业务综合传输的系统。 The design of the present invention has its main reusable modules, compatible with both the OLT and ONU, compatible with static bandwidth allocation algorithm (SBA) and Dynamic Bandwidth Allocation Algorithm (DBA) of the EPON system, and is compatible with other Ethernet EPON system, the circuit business integrated transmission system.

本发明的方法能够确保电路业务的服务质量(QoS),电路业务接口的技术性能指标能满足国内外相关规范要求,且本发明方法中的同步方法能够应用在任何基于以太网的网络中。 The method of the present invention can ensure quality of service (QoS) traffic circuit, technical service interface circuit performance to meet regulatory requirements related to the domestic and foreign, and the method of the present invention can be applied in any synchronization method of an Ethernet-based network.

Claims (16)

1.一种电路业务在基于以太网的无源光网络上传输的方法,是在由光纤线路终端、光分配网和多个光网络单元组成的以太网无源光网络上接入电路业务数据,包括由光纤线路终端至光网络单元的下行方向的信号传送,和由光网络单元至光纤线路终端的上行方向的信号传送,其特征在于:所述下行方向的信号传送包括以下处理步骤:A1.光纤线路终端利用业务时钟fs将电路业务数据封装到以太网MAC帧的数据区中,同时在以太网MAC数据帧中封装以太网源地址、目的地址和时间标签值1;A2.光纤线路终端根据分配给电路业务数据的带宽和发送时隙,进行电路业务数据MAC帧的发送;A3.光网络单元通过解封装处理从电路业务数据MAC帧中提取出电路业务数据;A4.光网络单元采用独立业务时间标签法,采用的时钟与系统时钟无关,利用时间标签值1生成与光纤线路终端 CLAIMS 1. A circuit for service transmission on Ethernet-based passive optical network, an access circuit in the service data by the Ethernet passive optical network optical line terminal, the optical distribution network and a plurality of optical network units , comprising a signal transmitted by the optical fiber line terminal to the optical network unit downstream direction, the signal transmitted by the optical network unit to the upstream direction of the optical line terminal, wherein: transmitting the downlink signal comprises the following processing steps: A1 An optical fiber line terminal using the service clock fs encapsulating circuit traffic data area of ​​the Ethernet MAC frame, while the encapsulated Ethernet MAC source address in the Ethernet data frame, the destination address and the time stamp values ​​1;. A2 optical line terminal the bandwidth allocated to the service data and transmission time slot circuit, the transmission circuit MAC service data frame;. A3 optical network unit extracts the service data from the circuit in the circuit MAC service data frame by decapsulating process;. A4 optical network unit uses independent labeling time traffic, and system clocks used regardless of the use of a time stamp value generating optical line terminal 业务时钟fs同步的业务时钟fs2,输出提取出的电路业务数据;所述上行方向的信号传送包括以下处理步骤:B1.术网络单元利用业务时钟fs2将电路数据封装到以太网MAC帧的数据区中,同时在以太网MAC数据帧中封装源地址和目的地址;B2.光网络单元根据分配给电路业务的带宽和发送时隙,进行电路业务数据MAC帧的发送;B3.光纤线路终端通过解封装处理从电路业务数据MAC帧中提取出电路业务数据;B4.光纤线路终端利用业务时钟fs,输出提取出的电路业务数据。 The service clock fs fs2 service clock synchronization circuit outputs the extracted service data; transmitting the uplink signal comprises the following processing steps:. B1 network operation unit utilizes a clock fs2 encapsulating circuit traffic to the data area of ​​the Ethernet MAC frame while the data in the Ethernet MAC frame encapsulating the source and destination addresses;. B2 optical network unit according to the allocated bandwidth and circuit traffic transmission slot, traffic data transmission circuit MAC frames;. B3 terminal through the optical fiber line Solutions encapsulation processing circuit extracting traffic data from the MAC frame circuit service data;. optical line terminals B4 using the service clock fs, outputs the extracted circuit data service.
2.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述步骤A1、B1中,封装的以太网源地址和目的地址,是在系统初始化或者在系统正常运行时,由系统网管根据光纤线路终端和光网络单元两端点间电路业务的对应关系通过系统软件进行分配或者进行调整、重新配置,并保存在光纤线路终端和光网络单元中的本地存储器中。 A circuit according to claim 1, the traffic in the transmission based on the Ethernet passive optical network, wherein: said step A1, B1, the encapsulated Ethernet source and destination addresses are during system initialization, or system during normal operation, by the system network in accordance with the correspondence between the optical line terminals and two end points of the optical network unit circuit services by the system software assigned or adjusted, reconfiguration, and stored in the optical line terminal and an optical network unit, local memory.
3.根据权利要求2所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:是由光纤线路终端和光网络单元中的电路业务控制与0AM模块,通过与系统网管的通信与消息处理,根据系统网管的要求配置适配封装处理部分,将光纤线路终端和光网络单元两端开通电路业务的端口通过所述的以太网源地址与目的地址连接起来。 3. A circuit as claimed in claim 2, the service transmission method in the Ethernet-based passive optical network, comprising: an optical fiber by an optical network line terminal and the service control unit and 0AM circuit module, by the system communicates with the network management message processing, encapsulation processing section adapted to the configuration according to the requirements of the network management system, the terminal ends of the fiber line and an optical network unit circuit services open a port connected by the Ethernet source and destination addresses.
4.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于所述步骤A1、B1中,是先将电路业务数据缓存一个封装周期的时间,然后再按该封装周期对电路业务数据进行周期性地封装。 A circuit according to claim 1 service transmission method in the Ethernet-based passive optical network as claimed in claim, wherein said step A1, B1, the first circuit is a package service data cache cycle time and then periodically cycle the encapsulant encapsulating circuit traffic data.
5.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于所述步骤A1、B1中,所述的封装还包括插入帧校验序列和长度/类型字节。 5. A circuit as claimed in claim 1, the traffic in the transmission based on the Ethernet passive optical network, wherein said step A1, B1, the package insert further comprises a frame check sequence and a length / type byte.
6.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于所述步骤A1中,封装时间标签值1,是针对单路电路业务提供时间标签值1。 6. A circuit as claimed in claim 1, the traffic in the transmission based on the Ethernet passive optical network, wherein said step A1, the time stamp value of the package 1, to provide time for a single service circuit 1 tag value.
7.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于所述步骤A1中,封装时间标签值1,是针对电路业务复用后的高次群电路业务提供时间标签值1。 A circuit according to claim 1 service transmission method in the Ethernet-based passive optical network as claimed in claim, wherein said step A1, the time stamp value of the package 1, for the circuit service is multiplexed group to provide higher time circuit service tag value 1.
8.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述步骤A2中,发送的时间标签值1,通过专门的MAC帧传送,或者与包含电路业务数据的MAC帧一起传送,或者与其它网管类MAC帧一起传送。 A circuit according to claim 1, the traffic in the transmission based on the Ethernet passive optical network, wherein: said step A2, the time stamp value of the transmission 1, by a dedicated MAC frame forwarding or transmitted with the MAC frame includes service data circuit, or other network type transmitted together with the MAC frame.
9.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述步骤A1中的时间标签值1,是由业务时钟fs经倍频生成时间标签时钟fts,再由计数器计算时间标签时钟fts经过的周期数,获得时间标签值1。 A circuit according to claim 1, the service transmission method in the Ethernet-based passive optical network, wherein: said time tag value A1 in step 1, by the service clock fs via multiplier fts label generation time clocks, the number of cycles elapsed time tag clock fts recalculated by the counter, the time tag value 1 is obtained.
10.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述的步骤A1、B3中,是由交换处理部分,根据目的MAC地址将封装的电路业务数据MAC帧交换到预定的端口,该端口不传送承载数据业务的以太网帧。 A circuit according to claim 1 service transmission method in the Ethernet-based passive optical network as claimed in claim, wherein: said step A1, B3, the switching by the processing section, according to the destination MAC address the encapsulated MAC frame circuit switched data traffic to a predetermined port which does not transmit the Ethernet frame carrying data traffic.
11.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述的步骤A2、B2中,所述的电路业务数据MAC帧是与承载数据业务的以太网帧在系统控制下统一传输的。 11. A circuit as claimed in claim 1, the traffic in the transmission based on the Ethernet passive optical network, wherein: said step A2, B2, the circuit MAC service data frame is Ethernet frames carrying data traffic under the unified control of the transmission system.
12.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述步骤A2、B2中,采用动态带宽分配机制给电路业务分配带宽,封装了电路业务数据的以太网MAC帧有最高发送优先级。 12. A circuit according to claim 1 service transmission method in the Ethernet-based passive optical network as claimed in claim, wherein: said step A2, B2, a dynamic bandwidth allocation mechanism to allocate bandwidth service circuit, encapsulates the Ethernet MAC circuit service data transmission frame has the highest priority.
13.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述步骤A2、B2中,采用静态带宽分配机制给电路业务分配固定的带宽,封装了电路业务数据的以太网MAC帧在固定的时刻周期性地发送。 13. A circuit according to claim 1 service transmission method in the Ethernet-based passive optical network as claimed in claim, wherein: said step A2, B2, a static bandwidth allocation mechanism fixed to the traffic distribution circuit bandwidth Ethernet MAC frame encapsulates service data transmission circuit periodically in a fixed time.
14.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述的步骤A3中,封装后的电路业务数据MAC帧,通过查找目的地址,确定发送的对应光网络单元的处理单元。 14. A circuit as claimed in claim 1, the traffic in the transmission based on the Ethernet passive optical network, wherein: said step A3, the circuit service data encapsulated MAC frame, by finding the object address, determination processing unit corresponding to the optical network unit is transmitted.
15.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述步骤A3、B3中,提取出的电路业务数据先发送给本地存储器缓存,进行延时抖动的平滑处理。 15. A transmission method in an Ethernet-based passive optical network, wherein the service A circuit according to claim 1, wherein: said step A3, B3, the extracted circuit data is first sent to the local service memory cache, a delay jitter smoothing.
16.根据权利要求1所述的一种电路业务在基于以太网的无源光网络上传输的方法,其特征在于:所述步骤A4中采用独立时间标签法生成与fs同步的业务时钟fs2进一步包括:生成一个标称频率与时间标签时钟fts相同的本地时钟fts2;由本地时钟fts2驱动一可控计数器,生成时间标签值2;计算时间标签值1与时间标签值2间的差值,用该差值将可控计数器输出的时间标签值2置为与时间标签值1相同,和利用该差值调整分频控制器对fts2的分频数获得业务时钟fs2。 16. A circuit as claimed in claim 1, the traffic in the transmission based on the Ethernet passive optical network, wherein: said step A4 independent of time tagging generates a clock synchronized traffic fs further fs2 comprising: generating a frequency of nominally identical fts local clock time stamp clock FTS2; FTS2 driven by a controlled local clock counter 2 generates a time stamp value; calculating a time stamp value of the difference between the two values ​​1 and time stamp, with this difference is the same time the output of the controllable counter tag value 2 value 1 is set to the time stamp, and using the difference frequency division controller for adjusting the frequency division number is obtained fts2 service clock fs2.
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