最新刊期
      卷 ， 期 1 ， 2006
      • WU Jun,HUANG Wei
        Issue 1, Pages: 1-4(2006) DOI: 10.13756/j.gtxyj.2006.01.001
        摘要：In this paper,the concept of home network,developing status in abroad and domestic,the supporting technologies,and the reasons of restricting factors of home network development in domestic is introducede.According to the concrete status of our country,we must deploy the home network step by step.At last summarize possible represented formats of home network in our country.  
        关键词：home network;digital family;FTTH;triple play;IPTV   
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      • JIN Zhen-kun,XIAO Ping-ping,WANG Jian-li
        Issue 1, Pages: 5-7(2006) DOI: 10.13756/j.gtxyj.2006.01.002
        摘要：In this article,the characteristic and applied status of large-scale routing technologies in NGN were introduced briefly.Mainly,the function and architecture of TRIP were presented.TRIP topology and working process of limited machine in Location Server（LS）were specified.At last,brief description was done to the current application of TRIP.TRIP can handle the whole domain routing preferably as a universal tool of exchanging routing information.  
        关键词：large-scale routing technologies;TRIP;LS;ITADs   
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      • LI Jian,CUI Yan-jun,YANG Ai-ping
        Issue 1, Pages: 8-10(2006) DOI: 10.13756/j.gtxyj.2006.01.003
        摘要：As one of the key issues in signaling research,the signaling reliability of ASON directly affects the reliability and quality of services.This paper focuses on the reliability mechanisms of ASON signaling protocol.Two protocols,CR-LDP and RSVP-TE,are analyzed and compared.First the adjacency discovery,session creation and maintenance of CR-LDP are introduced and then how RSVP-TE maintains its states,monitors neighbor states and reliably transports messages are analyzed.  
        关键词：ASON;CR-LDP;RSVP-TE;signaling reliability   
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      • CUI Yan-jun,LI Jian,ZHANG Zhi-shan,DENG Yu,GU Wan-yi
        Issue 1, Pages: 11-13(2006) DOI: 10.13756/j.gtxyj.2006.01.004
        摘要：ASON can provide the rapid and efficient survivability strategy.This paper describes the simulation platform based on fault restoration mechanism,analyze the control messages under fault conditions and simulate the change of control messages under different topology and network load.At last,the control traffic bit rate is analyzed.  
        关键词：ASON;GMPLS;control traffic bit rate;restoration   
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      • ZHANG Zhong-ping~
        Issue 1, Pages: 14-15(2006) DOI: 10.13756/j.gtxyj.2006.01.005
        摘要：In this paper we introduced a Signaling Nested Reservation Protocol（SNRP） based on the Backword Reservation Protocol（BRP）.The network can transfer large amounts of non-real-time packets by consuming unoccupied band in resource reservation.The protocol is realized by modifed BRP.Meanwhile,we analyzed the signaling mechanism which is used to improve the Nested Reservation Protocol（NRP）.The SNRP can be used in ION to enhance the performance of ION.  
        关键词：ION;Backword Reservation Protocol（BRP）;SNRP   
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      • KE Jun-jie~1,MAO Qian~1,HE Wei-chun~2
        Issue 1, Pages: 16-18(2006) DOI: 10.13756/j.gtxyj.2006.01.006
        摘要：What are the main factors which effect NMS working and the logical relationship among these factors is analyzed due to it is required by NMS development and test in this paper.After that,we construct the dynamic-static mechanism and the multi-layer model of transmission network.Then,we discuss the method to found Visual Model,Database Model,Application Model and Service Model.This emulation model has been used to indicate the development of system testing tool & demonstration software.It can be used as a consult during the course of software product designing & programming.  
        关键词：modeling;emulation;Network Management System （NMS）;object oriented   
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      • BAI Ze-gang
        Issue 1, Pages: 19-22(2006) DOI: 10.13756/j.gtxyj.2006.01.007
        摘要：With SDH/WDM network building rapidly,a lot of attention focuses on network management system research.In this paper,firstly, definition and architecture of SDH/WDM optical transtport network management system and its technology specification were introduced.Then,EMS’ and NMS’ functions are detailed in different level and different direction.Lastly,we point out its trend of development and problems in practice.  
        关键词：network management system;EMS;NMS;trend of development;problem   
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      • JIANG Li-fan,YAN Ding-ming,HUANG Xiao
        Issue 1, Pages: 23-25(2006) DOI: 10.13756/j.gtxyj.2006.01.008
        摘要：Curve is a necessary subassembly for any graphic method,also in topology drawings of network management.To avoid nodes overlapping making use of curve is very important,more network nodes,more important.In this paper an algorithm for splitting cubic Bézier based on the research on property of Bézier curve is given.The algorithm has been realized in the topology drawings of network management,which much improves the interface and has higher stability.  
        关键词：Bézier curve;split;graph   
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      • CHENG Xiao-jun,GE Ning,FENG Chong-xi
        Issue 1, Pages: 26-29(2006) DOI: 10.13756/j.gtxyj.2006.01.009
        摘要：Multi-Service Transport Platform（MSTP） can transport multi-traffic on SDH network.Routing and protection module is the core module of the network management software.Because of the constraint of cost,there are possibly several kinds of equipments in a SDH network.It makes the routing algorithm more complicated.Routing and protection algorithm of such complicated SDH network is studied in this paper.Algorithm for circuit traffic and data traffic is proposed.The algorithm has been the core algorithm of our SDH network management system.  
        关键词：optical communication;SDH;Multi-Service Transport Platform（MSTP）;routing   
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      • LI Xiu-hua,ZHANG Zhong-ping,HOU Shao-hua
        Issue 1, Pages: 30-32(2006) DOI: 10.13756/j.gtxyj.2006.01.010
        摘要：The advent of the automatic switched transport network has necessitated the development of interoperable procedures for requesting and establishing dynamic connectivity（with varying levels of transparency） between clients（e.g.IP,ATM,and SONET devices）connected to the transport network.UNI is the service control interface between the user devices and the transport network.This paper introduces the process of neighbor discovery in OIF UNI 1.0 down to the last detail.At the same time,this paper put forward a method to carry out the neighbor discovery by the VC++6.0.  
        关键词：UNI;LMP;neighbour discovery;sockets   
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      • WAN Li-hong~1,Lü Wei~1,ZHANG Pei~1,GU Wan-yi~1,ZHOU Xi-zeng~2
        Issue 1, Pages: 33-35(2006) DOI: 10.13756/j.gtxyj.2006.01.011
        摘要：In this paper,a new static routing and waveband tunnel allocation algorithm suitable for multigranular WDM network is proposed, which is called the balanced-routing and Bidirection-First-fit algorithm.This algorithm is aimed to minimize the total sum of port number over all MG-PXC nodes in the network,and reduce network cosk and control complexity.In the stage of selecting a route,this algorithm manages to keep the balance of link load of the whole network.In the stage of waveband tunnel allocation,it improves the FF algorithm to establish as many waveband passages as possible.The simulation results show that the two characteristics of BBFF reduce the number of wavelength ports needed greatly in the case of certain traffic volume.So much network cost is saved.  
        关键词：multigranular WDM network;routing and waveband tunnel allocation;MG-PXC;network cost   
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      • WANG Jian-quan~
        Issue 1, Pages: 36-37(2006) DOI: 10.13756/j.gtxyj.2006.01.012
        摘要：A new failure location method for telecommunications is proposed in this paper.The method craves up complex failure location into some sub-questions by dealing with alarm signals in respective layers,and makes these questions simple by adopting logic analysis and conclusion methods.In addition,the new method support function which include deleting and adding location principle in respective layers for network operator,and it is flexible and well applicability.The method has been applied for patent and has been used in existed networks.  
        关键词：failure location;layering;alarm;SDH;WDM;network   
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      • WANG Zhi-song
        Issue 1, Pages: 38-41(2006) DOI: 10.13756/j.gtxyj.2006.01.013
        摘要：This paper goes through the basic details of GMPLS extensions to RSVP-TE,which is mainly used to dynamically establish/maintain/delete connection in non-IP network,especially in optical network.The new objects and message not covered by RSVP-TE are introduced in this paper.The connection establishment/deletion and the restart of controlling plan procedure in optical network are also described with the aid of some examples.It also compares and summarizes the difference of connection establishment procedure between RSVP-TE and GMPLS RSVP-TE.  
        关键词：GMPLS;RSVP;signaling   
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      • WANG Xi~1,ZHU Xiao-lian~1,LI Hui~2,LI Qi~2
        Issue 1, Pages: 42-44(2006) DOI: 10.13756/j.gtxyj.2006.01.014
        摘要：At the present time,software technology on FT/HA is a very important study problem in software development of telecommunication protocol.The study on this problem has much concernful significance for improving telecommunication high-reliability.We firstly describe fundament of FT/HA technology,and then propose a sort of FT/HA solving scheme based on warm-backup.Finally,we mostly discuss this solving scheme which is applied to SIP protocol development.  
        关键词：FT/HA;PSF;SIP   
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      • CAI Kang,LI Hong,ZHU Ying-jun,LIU Wei-chuan
        Issue 1, Pages: 45-47(2006) DOI: 10.13756/j.gtxyj.2006.01.015
        摘要：The article has a brief introduction for VPLS technology at first,thereafter research it’s future broad prospect in telecommunication networks.Simultaneously,discuss the current approach to establish VPLS network in IP WAN with example,since many of WAN network doesn’t enable the MPLS protocol,the article introduces how to enable VPLS application across noMPLS WAN through the tunnel technology and establish "any-to-any" VPLS connection.  
        关键词：VPLS;MPLS;BGP   
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      • HE Jun,YANG Ming,LIU Ming-rui,HU Qiang-gao
        Issue 1, Pages: 48-51(2006) DOI: 10.13756/j.gtxyj.2006.01.016
        摘要：Optical transmission networks based on Dense Wavelength Division Multiplexing（DWDM） system make up the physical layer of the whole telecommunication system.To fit the demands for the system application and development,researching and producing OPM（In-line optical performance monitor） becomes a hot-spot in many device-supply corporations recently.A typical OPM can monitor the parameters of channel optical power,center wavelength and Optical Signal-Noise Ratio（OSNR） and so on.In this article,the application background,technical characteristics,performance and future development are discussed.  
        关键词：DWDM;OPM;OSNR   
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      • CHEN Lin~1,XU Jun~1,SHAO Xiao-peng~1,LI Gao-feng~2
        Issue 1, Pages: 52-55(2006) DOI: 10.13756/j.gtxyj.2006.01.017
        摘要：In this paper the structure and operation principle of Erbium-Doped Fiber Amplifier（EDFA） are introduced firstly.Then,the factors influencing the gain and Noise Figure（NF） of EDFA are investigated comprehensively and deeply with laser principle and energy-level theory.Some important conclusions about the relation of gain,noise and pump power,pump way,input signal power,erbium-doped fiber length,etc are drawn and verified further through the experiment;The methods to enhance gain and reduce NF are proposed.Finally,according to those conclusions,a c-band,high gain and low noise optical circuit of EDFA is designed,and the optical circuit has already been applied to project practice.  
        关键词：EDFA;gain;Noise Figure（NF）   
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      • ZHENG Guang-wei,ZHAO Shang-hong,FAN Guo-li,YANG Qing-hua
        Issue 1, Pages: 56-59(2006) DOI: 10.13756/j.gtxyj.2006.01.018
        摘要：A new method of two segments of Er3+-Tm3+co-doped silica fiber cascaded is given in order to get more power gain while not interfering with the characteristic of its ultra-wide band amplification.Based on the rate and power equations,the operational characteristics of two cascaded Er3+-Tm3+ co-doped silica fibers are simulated.The simulation results show that the power gain of two fibers cascaded is up to 20 dB.The new method basically solves the problem of its ultra-wideband amplification while having low power gain.Compared with other wideband fiber amplifiers at present,it can be concluded that this kind of two Er3+-Tm3+ co-doped silica fiber cascaded amplifier is more advantageous not only in the system complexity,but also in the cost.  
        关键词：optical fiber communication;Er3+-Tm3+ co-doped ultra-wide band fiber amplifier;wideband fiber amplifier;Er3+-Tm3+ co-Doped Fiber（ETDF）   
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      • LI Xi-hong,DUAN Gao-yan,ZHANG Xiao-guang,ZHANG Ru,YANG Bo-jun
        Issue 1, Pages: 60-62(2006) DOI: 10.13756/j.gtxyj.2006.01.019
        摘要：Polarization Mode Dispersion（PMD） has become the main limiting factors on the high-speed optical fiber communication system,and in order to research it’s effects on the optical fiber communication system, many kinds of PMD emulators have been developed to replace the real optical fiber for experiment researches.The principles and configurations of first-order three kinds of polarization-mode-dispersion emulators are introduced in this paper.Using the fixed analyzer method measures their differential group dispersion values.Their performances are analyzed and compared and the right PMD emulator will be selected according to the experiment purpose.  
        关键词：PMD;emulator;Differential Group Dispersion（DGD）;fixed analyzer   
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      • HU Jia-yan,YIN Xin-da
        Issue 1, Pages: 63-66(2006) DOI: 10.13756/j.gtxyj.2006.01.020
        摘要：Fiber Bragg Grating（FBG） sensors are applicable to quasi-distributed sensing networks due to its unique characteristic of wavelength-encoded measurand information.In this paper,several demodulation techniques for FBG sensing networks are discussed with the emphasis on their principles,performances and characteristics.Several commonly-used FBG multiplexing methods are analyzed,their merits,demerits and the networking scale compared and the development prospects of quasi-distributed FBG sensing networks are discussed.  
        关键词：FBG sensor;demodulation;multiplexing   
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      • WANG Yi,FENG Bao-liang,XU Jie
        Issue 1, Pages: 67-70(2006) DOI: 10.13756/j.gtxyj.2006.01.021
        摘要：A simple way to deal with the distortion of the WCDMA power amplifiers has been proposed.The predistortion linearizer allows adjustment of the AM-AM and AM-PM curves to compensate the power amplifier nonlinearities.These characteristics are provided by a nonlinearity of the diode.By applying this predistortion linearizer to a WCDMA power amplifier,the ACPR can be improved by（5 dB.）  
        关键词：linear booster amplifier;predistortion;diode;AM-AM transfer;AM-PM transfer;ACPR   
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