IEEE1588在xPON系统中的应用
摘要
为了满足人们日益增长的带宽需求,EPON/GPON等新兴的宽带接入方法应运而生,实现EPON/GPON的综合业务接入的光网络终端设备显得十分重要。满足带宽的同时,越来越多的应用对时钟同步提出了比较高的要求。IEEE1588精确时间同步协议,特别是。它能达到的高精度和较低的开销为人们实现在特定场所的应用提供了现实可行的方法。
本文从时间同步的基本概念出发,描述了时间同步技术的发展,并对PTP协议中时钟同步的通信机制,最佳主时钟算法以及PTP报文的收发流程进行了全面系统地分析。从实际应用出发,描述了现场设备中IEEE 1588时钟同步在智能电网以及移动承载网上的应用以及具体的实现过程。
我们开发的GPON产品在市场占有。席之地,那么在EPON/GPON系统中增加了精确时钟同步功能的研发产品就更具有市场价值了。从市场调研到方案选择,再到具体的设计实现,最后到测试验证是产品研发的整个周期过程。我在其中主要的工作是完成xPON系统中NT板子的PCB设计,以及对于NT板上的精确时钟同步功能的电路设计和测试分析。最后经过几个月的研发测试,各项测试指标证实时钟传输时延小于1us,意味着我们的设计达到了精确时钟同步的要求。
With the increasing demand of bandwidth, new technology of Broad Band access:EPON/GPON emerges as the market require. It is very important that Optical Network Terminal (ONT) is implemented in integrated service assess of EPON/GPON. At the same time, more and more applications demand higher accuracy of clock synchronization. Fortunately, the occurrence of IEEE 1588 precision time synchronization protocol provide a practical and feasible way to meet high precision time synchronization applications in certain fields.
Based on the conception of synchronization, the paper introduces the development of time synchronization, gives a complete and systematic analysis of clock synchronization protocol PTP communication mechanism, the best master clock algorithm and send/receive packets of PTP process. For the sake of practical application, the paper describes the scenario of how to use the IEEE 1588 clock synchronization devices in the smart grid and mobile bearer network. At the same time the specific implementation process of these applications are brought forward.
ALU GPON products play an important role in market place. Therefore puts the precision clock synchronization function into EPON/GPON system will adds more value to the EPON/GPON products. The whole process of the research product cycle includes market research, the decision of design scheme, detail design and the test validation. During this process, my responsibility is to accomplish the PCB design of the NT board of the xPON system, as well as the circuit design and test analysis of the NT board. After months of research and development and testing, all the test indexes confirm that the transmission delay less than lus, it means that the design meets the requirement of the precision clock synchronization standard.
本文从时间同步的基本概念出发,描述了时间同步技术的发展,并对PTP协议中时钟同步的通信机制,最佳主时钟算法以及PTP报文的收发流程进行了全面系统地分析。从实际应用出发,描述了现场设备中IEEE 1588时钟同步在智能电网以及移动承载网上的应用以及具体的实现过程。
我们开发的GPON产品在市场占有。席之地,那么在EPON/GPON系统中增加了精确时钟同步功能的研发产品就更具有市场价值了。从市场调研到方案选择,再到具体的设计实现,最后到测试验证是产品研发的整个周期过程。我在其中主要的工作是完成xPON系统中NT板子的PCB设计,以及对于NT板上的精确时钟同步功能的电路设计和测试分析。最后经过几个月的研发测试,各项测试指标证实时钟传输时延小于1us,意味着我们的设计达到了精确时钟同步的要求。
With the increasing demand of bandwidth, new technology of Broad Band access:EPON/GPON emerges as the market require. It is very important that Optical Network Terminal (ONT) is implemented in integrated service assess of EPON/GPON. At the same time, more and more applications demand higher accuracy of clock synchronization. Fortunately, the occurrence of IEEE 1588 precision time synchronization protocol provide a practical and feasible way to meet high precision time synchronization applications in certain fields.
Based on the conception of synchronization, the paper introduces the development of time synchronization, gives a complete and systematic analysis of clock synchronization protocol PTP communication mechanism, the best master clock algorithm and send/receive packets of PTP process. For the sake of practical application, the paper describes the scenario of how to use the IEEE 1588 clock synchronization devices in the smart grid and mobile bearer network. At the same time the specific implementation process of these applications are brought forward.
ALU GPON products play an important role in market place. Therefore puts the precision clock synchronization function into EPON/GPON system will adds more value to the EPON/GPON products. The whole process of the research product cycle includes market research, the decision of design scheme, detail design and the test validation. During this process, my responsibility is to accomplish the PCB design of the NT board of the xPON system, as well as the circuit design and test analysis of the NT board. After months of research and development and testing, all the test indexes confirm that the transmission delay less than lus, it means that the design meets the requirement of the precision clock synchronization standard.
引文
[1]IEEE std.1588-2002,Precision Clock Synchronization protocaol for networked measurement and control system [S].2004
[2]Introduction to IEEE 1588,http://ieee1588.nist.gov/
[3]John C. Eidson,Recent Advances in IEEE 1588 Technology and Itss Applications, Agilent Technologies,July.2005
[4]黄水云,冯玉光.IEEE1588精密时钟同步分析[J].国外电子测量技术,2005,9：10-12
[5]桂本炬,冯冬芹,褚健.IEEE1588的高精度时间同步算法的分析与实现[J].工业仪表与自动化装置.2006,4：20-23
[6]Andre Girard著,杨柳译.FTTx PON技术与测试[M].2007,7
[7]陈良华,黄源编.PTP协议时间同步精度测试.重庆邮电大学,2007,9
[8]袁振华,董秀军,刘朝英.基于IEEE 1588的时钟同步技术及其应用[J].计算机测量与控制.2006,12
[9]戴宝峰,崔少辉,常健.IEEE 1588最佳主时钟算法的分析与实现[J].仪表技术,2008,2
[10]刘博,许玮,王京,方波等.IEEE 1588时钟同步技术在LTE系统中的应用[J].数字通信世界,2009,4：48-49
[11]田广锟 编.高速电路PCB设计与EMC技术分析[M].北京：电子工业出版社,2008：50-80
[12](美)约翰逊等著,沈立等译.高速数字设计[M].北京：电子工业出版社,2004：100-200.
[13]周志敏,纪爱华编著.电磁兼容技术：屏蔽、滤波、接地、浪涌、工程应用[M].北京：电子工业出版社,2007：120-260.
[14]H.Kopetz, W.Ochsenreiter.Clock Synchronization in Distributed Real-Time Systems[M]. Wien:Technische Univ.Wien,Inst,1987:933-939
[15]郑军奇 编.EMC(电磁兼容)设计与测试案例分析[M].北京：电子工业出版社,2007：160-267.
[16]IEEE Std 1159.1 IEEE standard test access port and boundary-scan architecture[S].2001
[17]ITU-T G984.3 Amendment 2.Series G:Transmission systems and Media, Digital Systems and Network[S].2008
[18]ETSI EN 300 386 vl.3.3. Electromagnetic compatibility and Radio spectrum Matters (ERM); Telecommunication network equipment; ElectroMagnetic Compatibility (EMC) requirements[S].2005
[19]EN60950-1. Safety of information technology equipment, including electrical business equipment [S].2001.
[20]ITU-T K.20. Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents[S].2003.
[21]ITU-T K.45. Resistibility of telecommunication equipment installed in the access and trunk networks to overvoltages and overcurrents [S]. 2003.
[21]EN61000-4-6. Electromagnetic compatibility(EMC)-Paert 3-6:Testing and measurement techniques-Immunity to conducted disturbances, induced by radio-frequency fields[S].2001.
[2]Introduction to IEEE 1588,http://ieee1588.nist.gov/
[3]John C. Eidson,Recent Advances in IEEE 1588 Technology and Itss Applications, Agilent Technologies,July.2005
[4]黄水云,冯玉光.IEEE1588精密时钟同步分析[J].国外电子测量技术,2005,9：10-12
[5]桂本炬,冯冬芹,褚健.IEEE1588的高精度时间同步算法的分析与实现[J].工业仪表与自动化装置.2006,4：20-23
[6]Andre Girard著,杨柳译.FTTx PON技术与测试[M].2007,7
[7]陈良华,黄源编.PTP协议时间同步精度测试.重庆邮电大学,2007,9
[8]袁振华,董秀军,刘朝英.基于IEEE 1588的时钟同步技术及其应用[J].计算机测量与控制.2006,12
[9]戴宝峰,崔少辉,常健.IEEE 1588最佳主时钟算法的分析与实现[J].仪表技术,2008,2
[10]刘博,许玮,王京,方波等.IEEE 1588时钟同步技术在LTE系统中的应用[J].数字通信世界,2009,4：48-49
[11]田广锟 编.高速电路PCB设计与EMC技术分析[M].北京：电子工业出版社,2008：50-80
[12](美)约翰逊等著,沈立等译.高速数字设计[M].北京：电子工业出版社,2004：100-200.
[13]周志敏,纪爱华编著.电磁兼容技术：屏蔽、滤波、接地、浪涌、工程应用[M].北京：电子工业出版社,2007：120-260.
[14]H.Kopetz, W.Ochsenreiter.Clock Synchronization in Distributed Real-Time Systems[M]. Wien:Technische Univ.Wien,Inst,1987:933-939
[15]郑军奇 编.EMC(电磁兼容)设计与测试案例分析[M].北京：电子工业出版社,2007：160-267.
[16]IEEE Std 1159.1 IEEE standard test access port and boundary-scan architecture[S].2001
[17]ITU-T G984.3 Amendment 2.Series G:Transmission systems and Media, Digital Systems and Network[S].2008
[18]ETSI EN 300 386 vl.3.3. Electromagnetic compatibility and Radio spectrum Matters (ERM); Telecommunication network equipment; ElectroMagnetic Compatibility (EMC) requirements[S].2005
[19]EN60950-1. Safety of information technology equipment, including electrical business equipment [S].2001.
[20]ITU-T K.20. Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents[S].2003.
[21]ITU-T K.45. Resistibility of telecommunication equipment installed in the access and trunk networks to overvoltages and overcurrents [S]. 2003.
[21]EN61000-4-6. Electromagnetic compatibility(EMC)-Paert 3-6:Testing and measurement techniques-Immunity to conducted disturbances, induced by radio-frequency fields[S].2001.