The Packet Transport Network(PTN) technology includes Transport Multi-Protocol Label Switching(T-MPLS) and Provider Backbone Transport(PBT).T-MPLS is the simplified and reformed Multi-Protocol Label Switching(MPLS).It...The Packet Transport Network(PTN) technology includes Transport Multi-Protocol Label Switching(T-MPLS) and Provider Backbone Transport(PBT).T-MPLS is the simplified and reformed Multi-Protocol Label Switching(MPLS).It drops MPLS’connectionless features and its transport-unrelated forwarding processing,but adds the network model of the transport layer,protection switching and Operation,Administration and Maintenance(OAM) functionality.PBT enforces both OAM and protection functions,adds Time Division Multiplexing(TDM) business simulation and clock functions,and strengthens multi-service support capability.But PBT has no functions of traditional Ethernet address learning,address broadcast and Spanning Tree Protocol(STP).Both T-MPLS and PBT can well satisfy the requirements of packet transport.Compared to PBT,T-MPLS has better OAM functions.展开更多
The dynamical process of charge injection from metal electrode to a nondegenerate polymer in a metal/polythiophene （PT）/metal structure has been investigated by using a nonadiabatic dynamic approach. It is found tha...The dynamical process of charge injection from metal electrode to a nondegenerate polymer in a metal/polythiophene （PT）/metal structure has been investigated by using a nonadiabatic dynamic approach. It is found that the injected charges form wave packets due to the strong electron-lattice interaction in PT. We demonstrate that the dynamical formation of the wave packet sensitively depends on the strength of applied voltage, the electric field, and the contact between PT and electrode. At a strength of the electric field more than 3.0 × 10^4 V/cm, the carriers can be ejected from the PT into the right electrode. At an electric field more than 3.0 × 10^5 V/cm, the wave packet cannot form while it moves rapidly to the right PT/metal interface. It is shown that the ejected quantity of charge is noninteger.展开更多
为了满足航天地面系统配套需求,提出了一种光纤分组传送模块平台化设计方案。该方案采用基于分组交换的统一化承载方式,复用VITA Standard 46(VPX)规范硬件接口,对标准通信协议进行兼容性扩充,通过模块化软硬件设计实现模块类型识别、...为了满足航天地面系统配套需求,提出了一种光纤分组传送模块平台化设计方案。该方案采用基于分组交换的统一化承载方式,复用VITA Standard 46(VPX)规范硬件接口,对标准通信协议进行兼容性扩充,通过模块化软硬件设计实现模块类型识别、板间通信、配置/状态管理等功能。应用结果表明:该方案避免了共性技术重复开发,有效降低了系统复杂度,提升了产品研制及迭代速度。展开更多
数字经济发展需要运力和算力共同提升。算力的释放需要以大带宽、广连接、低时延为特征的高性能传输网络。国家对信息通信行业绿色低碳发展提出要求,开展极简传输网络演进势在必行。为此,分析传输网络的现状及问题,提出极简传输网络演...数字经济发展需要运力和算力共同提升。算力的释放需要以大带宽、广连接、低时延为特征的高性能传输网络。国家对信息通信行业绿色低碳发展提出要求,开展极简传输网络演进势在必行。为此,分析传输网络的现状及问题,提出极简传输网络演进的思路和方案,通过省内干线和城域网的同步数字体系(Synchronous Digital Hierarchy,SDH)网络与VC-OTN(Virtual Container-Optical Transport Network)融合演进、分组传送网(Packet Transport Network,PTN)网络与切片分组网(Slicing Packet Network,SPN)网络的融合演进,打造一张高品质、高性能、低碳的极简传输网络。展开更多
在信息技术飞速发展和通信网络日新月异的今天,传输设备在现代通信系统中有着举足轻重的地位。分组传送网(Packet Transport Network,PTN)和光传输网络(Optical Transport Network,OTN)是目前两大主流的传输技术,可满足人们对高速、大...在信息技术飞速发展和通信网络日新月异的今天,传输设备在现代通信系统中有着举足轻重的地位。分组传送网(Packet Transport Network,PTN)和光传输网络(Optical Transport Network,OTN)是目前两大主流的传输技术,可满足人们对高速、大容量、低延迟的业务需求。因此,文章综合分析PTN和OTN传输设备,探讨其优劣势及未来发展趋势,旨在给相关领域决策者与研究人员提供参考,推动通信网络不断创新与发展。展开更多
文摘The Packet Transport Network(PTN) technology includes Transport Multi-Protocol Label Switching(T-MPLS) and Provider Backbone Transport(PBT).T-MPLS is the simplified and reformed Multi-Protocol Label Switching(MPLS).It drops MPLS’connectionless features and its transport-unrelated forwarding processing,but adds the network model of the transport layer,protection switching and Operation,Administration and Maintenance(OAM) functionality.PBT enforces both OAM and protection functions,adds Time Division Multiplexing(TDM) business simulation and clock functions,and strengthens multi-service support capability.But PBT has no functions of traditional Ethernet address learning,address broadcast and Spanning Tree Protocol(STP).Both T-MPLS and PBT can well satisfy the requirements of packet transport.Compared to PBT,T-MPLS has better OAM functions.
基金Project supported by the State Key Program of National Natural Science of China (Grant Nos 10474056 and 10574082)the Natural Science Foundation of Shandong Province (Grant No Z2005A01)
文摘The dynamical process of charge injection from metal electrode to a nondegenerate polymer in a metal/polythiophene （PT）/metal structure has been investigated by using a nonadiabatic dynamic approach. It is found that the injected charges form wave packets due to the strong electron-lattice interaction in PT. We demonstrate that the dynamical formation of the wave packet sensitively depends on the strength of applied voltage, the electric field, and the contact between PT and electrode. At a strength of the electric field more than 3.0 × 10^4 V/cm, the carriers can be ejected from the PT into the right electrode. At an electric field more than 3.0 × 10^5 V/cm, the wave packet cannot form while it moves rapidly to the right PT/metal interface. It is shown that the ejected quantity of charge is noninteger.
文摘为了满足航天地面系统配套需求,提出了一种光纤分组传送模块平台化设计方案。该方案采用基于分组交换的统一化承载方式,复用VITA Standard 46(VPX)规范硬件接口,对标准通信协议进行兼容性扩充,通过模块化软硬件设计实现模块类型识别、板间通信、配置/状态管理等功能。应用结果表明:该方案避免了共性技术重复开发,有效降低了系统复杂度,提升了产品研制及迭代速度。
文摘数字经济发展需要运力和算力共同提升。算力的释放需要以大带宽、广连接、低时延为特征的高性能传输网络。国家对信息通信行业绿色低碳发展提出要求,开展极简传输网络演进势在必行。为此,分析传输网络的现状及问题,提出极简传输网络演进的思路和方案,通过省内干线和城域网的同步数字体系(Synchronous Digital Hierarchy,SDH)网络与VC-OTN(Virtual Container-Optical Transport Network)融合演进、分组传送网(Packet Transport Network,PTN)网络与切片分组网(Slicing Packet Network,SPN)网络的融合演进,打造一张高品质、高性能、低碳的极简传输网络。
文摘在信息技术飞速发展和通信网络日新月异的今天,传输设备在现代通信系统中有着举足轻重的地位。分组传送网(Packet Transport Network,PTN)和光传输网络(Optical Transport Network,OTN)是目前两大主流的传输技术,可满足人们对高速、大容量、低延迟的业务需求。因此,文章综合分析PTN和OTN传输设备,探讨其优劣势及未来发展趋势,旨在给相关领域决策者与研究人员提供参考,推动通信网络不断创新与发展。
