最新刊期
卷 ， 期 4 ， 2006
- 摘要：Based on the study of the relevant schemes by IETF,we have proposed an ASON-based optical multicast model,analyzed the multicast algorithm and the structural model,presented the basic line of thought,performance analysis and comparison of the optical multicast routing algorithm and constructed a centralized multicast model,thus satisfying the requirements of ASON for multicast service applications.关键词：ASON;optical multicast;management plane;control plane;transport plane;signaling;routing
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发布时间： - 摘要：In this article,we have proposed the layered graph algorithm and vertex coloring algorithm for optimized traffic sequence,which use genetic algorithm to arrange the calculation order of the scheduled multicast traffic in optical networks and compared them with the algorithm that arranges traffics in temporal sequence.Simulations show that the resource optimization effect after sequence optimization is evident and the layered graph algorithm outperforms the vertex coloring algorithm for the optimization of the number of the wavelengths.Besides,in layered graph algorithm,optimized traffic arrangement sequence also helps reduce the total link number of the multicast tree.关键词：scheduled multicast traffic;genetic algorithm;optical network;layered graph;vertex coloring
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发布时间： - 摘要：A simple and explicit analytical model for Stimulated Raman Scattering（SRS） effects in fiber dispersion walk-off regime is presented.On the basis of this model,the mean output power of the WDM system,SRS crosstalk impairment coefficient and the standard deviation of the output power due to SRS are calculated and the output power fluctuations resulted from the SRS reduction due to the dispersion walk-off analyzed.关键词：WDM;SRS;fiber dispersion
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发布时间： - 摘要：Resilient Packet Ring（RPR） technology defines a new type of Media Access Control（MAC） level protocol,which adopts shared medium transmission,a spatial reuse protocol and a <50 ms failure recovery protection mechanism,supporting Service Level Agreements（SLA） and plug-and-play.As an important technology for the future Metropolitan Area Network（MAN） with MAC-based high speed switching,RPR can carry burst IP service while supporting conventional voice transmission.With the rapid development of fiber technology, RPR can be used for both MAN and WAN.On the basis of RPR-based <50 ms failure recovery protection mechanism,a new high survivability network solution is presented in this paper.关键词：resilient packet ring（RPR）;high survivability;multi-ring network
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发布时间： - 摘要：A study on the management technologies for the future home networks is presented in this paper.Normal network operation is not possible without effective management and the mode of management for home networks definitely differs from that for the conventional networks owing to their application environment and users.In this article,a dual-management domain mode combining SNMP-based public network management and Web-technology-based intra-home network management are described,their respective requirements on management technologies presented and an implementation scheme given.关键词：home network;network management;SNMP;Web
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发布时间： - 摘要：In view of the multiple access modes for various devices in the home networking,we have proposed to use UPnP technology to implement a unified deployment of home networks.Considering the existence of large amounts of simple devices in the home network,we have designed a UPnP proxy gateway model and described its working modes.The use of UPnP gateway enables all the devices to be incorporated into the network,realizing such functions as auto-address,auto-discovery and auto-configuration.关键词：home network;UPnP;gateway
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- 115
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发布时间： - 摘要：The principle of Monte-Carlo simulation method is introduced and that of the modified Monte-Carlo simulation,i.e.Importance Sampling（IS） and its applications in communications,Esp.in Polarization Mode Dispersion（PMD） simulation,are analyzed.The experimental results show that low probability events of large Differential Group Delay（DGD） can be resulted by importance sampling simulation and the system configuration is much simpler than by the standard Monte-Carlo method.关键词：Monte-Carlo simulation;Importance Sampling（IS）;polarization mode dispersion（PMD）
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- 142
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发布时间： - 摘要：This article starts with the analysis of the characteristics of remote disaster recovery and the related problems,which is followed by the description of the Fiber Channel Storage Area Network（FC SAN） technology and the usage of the server cluster in remote disaster recovery,and a detailed discussion on the transmissions among different subnets of FC SAN by using the Multi-Service Transport Platform（MSTP） and Coarse Wave Division Multiplexer（CWDM） technology.It ends with the presentation of a comprehensive application-level remote disaster recovery solution.关键词：MSTP;CWDM;disaster recovery;FC SAN;server cluster
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- 67
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发布时间： - 摘要：In view of the robustness of the DWDM system against malicious attacks,the effects of the allocation of EDFAs and the length of Optical Amplifier Sections（OAS） on the system stability are analyzed.It is found that the accumulated noise of the amplifiers increases linearly with their stage numbers and exponentially with their losses.When the number of OAS and the receiver sensitivity of a system are fixed,it will enhance the stability of the system to choose a proper EDFA allocation and OAS length.关键词：stability;malicious attack;High Signal Power （HSP） attack;High Noise Power（HNP） attack
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发布时间： - 摘要：As the Session Initiation Protocol（SIP） has gradually become the core protocol for the next generation networks and has been widely applied in telecom and other key sectors,increasingly higher availability of SIP servers is required.A complete high availability SIP stack solution has been presented on the basis of the re-analysis of the layered structure of the SIP stack,the protocol stack rolling upgrade strategy explained in detail and the problems to be encountered in its applications and the relevant resolutions studied.关键词：SIP;high availability;rolling upgrade;distributed
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发布时间： - 摘要：The conventional Unidirectional Path Switched Ring（UPSR） is software-based,but for high capacity devices it cannot satisfy the switching-time requirement by ITU-T,especially for the low order path protection of STS-1 or tributary-based traffic.Message Assisted Protection Switching（MAPS） encodes the path alarm and inserts the code into its idle overhead bytes for automatic hardware protection switching,which can not only satisfy the system switching-time requirement of 50 ms,but also take much load off the microprocessors.关键词：hardware;UPSR;MAPS
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发布时间： - 摘要：Simple Network Management Protocol（SNMP） is the most popular network management protocol at present.In this paper,we propose an agent simulator for SNMP,which simulates the communication between the agent and the manager through analyzing the device information from the MIB files,thus simulating the multi-manufacturer environment and satisfying the environmental requirement for the development and testing in network management projects.关键词：SNMP;agent;MIB;OID
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- 91
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发布时间： - 摘要：Asynchronous FIFOs are often used to ensure the security in passing data between two different clock domains.It requires multi-asynchronous clock design techniques to safely pass data in one clock domain to another.Many FIFO design approaches have been reported but it is very difficult for us to analyze their correctness.In this paper,a new FIFO design is introduced in detail,by which data are passed between different clock domains by using Gray code pointers.关键词：asynchronous;synchronous;clock domain;FIFO;security
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- 361
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发布时间： - 摘要：With the rapid development of semiconductor technologies and increasingly greater IC scales and design complexity,all the EDA tools become more elaborate with each passing day.To improve the design efficiency with the aid of these tools has become a focus in the IC arena.In this paper,a TCL language-based system framework for the automated environment of IC design flow is introduced and its implementation method detailed.With the framework,IC designers can easily customize various types of automatic IC design flow and shorten their design cycles.关键词：EDA tool;TCL language;IC design flow automation
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发布时间： - 摘要：The disadvantages of silica fibers used in FTTH are analyzed and the latest research results of plastic fibers,devices and systems in the developed countries introduced.As it has good cost-performance,the perfluorinated polymer graded index plastic fiber is finding applications in FTTH.Now,the properties,mainly attenuation and dispersion,of FTTH-used plastic fibers can be clearly discriminated.Finally,a number of typical examples of plastic-fiber-connected intelligent home single-channel WDM fiber-optic communication systems are given.关键词：perfluorinated polymer;graded index;plastic optical fiber（POF）;communication system
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- 151
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发布时间： - 摘要：A distributed bandwidth resource allocation method is proposed for the elastic traffic in broadband access control.The network service provider（the Leader） and the users（the Followers） are formulated in a Stackelberg game model,in which the Leader sets the bandwidth price,while the Followers respond to the price through self-disciplined control.The theoretic basis is presented for the consistency between the distributed optimization and the global optimization.A numerical example is demonstrated by using Applied Mathematical Programming Language（AMPL） and the results are analyzed.关键词：broadband access;elastic traffic;bandwidth resource allocation
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- 91
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发布时间： - 摘要：As the 3G license granting date is drawing close,we have had still clearer knowledge of 3G.The development of 3G will be a long process characteristic of gradual convergence and smooth transition as the relevant data shows that there is still fairly large space of development for 2G. 3G will preferably be first applied in some hot spots and areas with vast traffic.It is not necessary to build 3G networks in large scales at the initial stage,when 3G covering can be accomplished by only some remote base stations.In this article,the important role of remote base stations in the future 3G networking is discussed from network application point of view,the possible problems in its present allocations analyzed and solutions to such issues as network management,station address and network interconnection and interworking suggested.关键词：remote base station;baseband;radio frequency;3G
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- 76
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发布时间： - 摘要：In this article,a real-time mobile video surveillance system has been presented.The real-time mobile video surveillance system includes: the surveillance subsystem of control center,the station surveillance subsystem,the vehicle subsystems and transmission subsystems.This article first introduces each subsystem from structure and function aspects,and then illustrates the advantages of real-time mobile video surveillance system from the technical level.This system has been applied in Chongqing Light Rail project,and finally achieved a comparable better关键词：mobile;digital video;surveillance system
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- 115
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发布时间： - 摘要：Endless single-mode photonic crystal fibers are theoretically designed by the Finite Difference Time Domain（FDTD） method,the manufacturing processes for micro-structured optical fibers and the relevant fiber drawing parameters presented and comparatively large mode-field wide-frequency single-mode Photonic Crystal Fibers（PCF） fabricated.The structural parameters of the PCF are as follows: core diameter 13.1 μm,aperture 3.2 μm,aperture space 8.2 μm,the mode field diameter and attenuations at 1 550 nm（14.6 μm） and 0.6 dB/km respectively and water peak at 1 383 nm 14.9 dB/km.The measurements of the cut-off wavelength and the near field intensity distribution show that the PCF does have comparatively wide single-mode operating range.关键词：microstructure;photonic crystal fiber（PCF）;Process
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发布时间： - 摘要：A new type of cable gel is introduced,which is used to fill in the interspaces of the cable due to its thermal expansion effects so as to entirely block water intrusion.In this paper,its development process and manufacturing techniques are described and the performance test data given.Compared with water swellable gels that are commonly used in China at present,the thermal expansion gel has many obvious advantages.关键词：thermal expansion gel;hydrophobic gel;hydrophilic gel;high polymer
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发布时间： - 摘要：Indispensable for high quality optical carrier signal reception in a large dynamic range,AGC analog optical receivers are widely used in the optical transmission of radio and microwave signals,such as fiber CATV,direct broadcast satellite TV,wireless communication and radar.By using a new optical input power level detection and signal treatment method to control the gain of the receiver and keep its output level within the required range,a novel feedforward AGC optical receiver without radio frequency feedback circuits is realized.关键词：AGC;feedforward;optical reception;dynamic range
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发布时间： - 摘要：Comparisons are made of the pulse compression characteristics of the nonlinear optical loop mirror constructed from three types of dispersion decreasing fibers.The results show that the linear dispersion profile fiber loop is optimal when high-order effects are not considered,while the Gaussian dispersion profile fiber loop is optimal when high-order effects are considered.However,the difference is not very distinct in this case.关键词：nonlinear optical loop mirror;dispersion decreasing fiber;pulse compression
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发布时间： - 摘要：Based on energyband engineering theory,the influences of tensile strain and quantum-well width on the gain polarization dependence of quantum-well Semiconductor Optical Amplifiers（SOA） are investigated.A 1.55μm gain polarization-insensitive SOA with tensile strained quantum-well as the active region is designed,which has very low polarization sensitivity in a wide range of carrier density and optical wavelengths.Also designed is a 1.31μm gain polarization-insensitive SOA with mixed tensile and compressively strained wells as the active region.关键词：semiconductor optical amplifier（SOA）;gain;quantum well;strain
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