最新刊期
      卷 ， 期 3 ， 1991
      • Li Minejiu et al
        Issue 3, Pages: 1-11(1991) DOI: 10.13756/j.gtxyj.1991.03.001
        摘要：An optical transmission line multiplexing terminal（GD/MF 565 H—I）with 565 Mbit/s digital signal transfer capability has been developed.In this paper,the constitution, technical specification and functionality of this equipment are described.Additionally, the labo ratory transmission is depicted.  
          
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      • Tian Liren
        Issue 3, Pages: 12-19(1991) DOI: 10.13756/j.gtxyj.1991.03.002
        摘要：FPGA is a newly—developed technology invented in USA in 1985, which has been widely deploying in ASIC field,but its application is just beginning in our country.This paper firstly introduces the fundamental features of FPGA and its development method, then describes the successful experience in developing ASIC used in district communications.  
          
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      • Wang Baotai
        Issue 3, Pages: 20-29(1991) DOI: 10.13756/j.gtxyj.1991.03.003
        摘要：This paper discusses the configuration of the integrated OE line terminal equipment for asynchronous and synchronous hierarchic multiplexing equipment as well as the frame synchronization method. The way of the realization of the system synchronization is described. The synchronous framing time of OE equipment has been studied and calculated by the computer-simulated experiment, and the availability prooftest has been carried out on 565 Mbit/s fiber-optic line terminal equipment.  
          
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      • Issue 3, Pages: 29(1991)
        摘要：<正> “七五”国家重点科技攻关项目——合肥至芜湖140Mbit/s单模直埋光缆通信系统试验工程于1991年5月24～26日通过国家验收。合肥——芜湖光缆工程是我国自行研制、建设的具有先进水平的直埋光缆通信干线。该工程北起安徽省合肥市、南至芜湖市,途径肥东、巢湖、含山、和县、无为五县,全长146km,内分两个数字段,合肥、巢湖、芜湖为三个端站,另设有人中继站1个,无人中继站两个。通信系统使用1.3μm波长,传输140Mbit/s数字信号,近期运行方式一主一备,今后为三主一备。  
          
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      • Yang Yigang
        Issue 3, Pages: 30-39(1991) DOI: 10.13756/j.gtxyj.1991.03.004
        摘要：In this paper a new structure of multisatge decimation and interpolation for digital band-pass signal bank has been proposed.With this new structure, a bank of muiti-stage decimators and interpolators can be replaced by a common decimation, interpolator and a DCT transformer.The new structure makes a feature of simple structure and less computations.  
          
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      • Chui Li
        Issue 3, Pages: 40-47(1991) DOI: 10.13756/j.gtxyj.1991.03.005
        摘要：Error is a very sophisticated phenomenon. This paper gives the results of error measurements for optical fiber communication systems, and its error characteristics are also studied.  
          
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      • Li Xiangyuan
        Issue 3, Pages: 48-57(1991) DOI: 10.13756/j.gtxyj.1991.03.006
        摘要：This article describes the properties of the SZ-GS optical fiber cable, and the characteristics of this type of optical cable,especially the inversion angle of the fiber and the grooved spacer,as well as the stranding coefficient of the optical fiber are discussed.  
          
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      • Gong Guangchang
        Issue 3, Pages: 58-63(1991) DOI: 10.13756/j.gtxyj.1991.03.007
        摘要：This paper mainly describes the optical cable communication project between Yangzhou and Huaiyin using all-Chinese-made SM optical cable and the fourth level hierarchy O/E equipment. Based on the practical questions of the project, some proposals are also given on the modification of the equipment.  
          
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      • Issue 3, Pages: 63(1991) DOI: 10.13756/j.gtxyj.1991.03.008
        摘要：<正> 武汉邮电科学研究院研制的三次群光电合架（GD/MF 34H）光线路复用终端机,于今年5月24日在浙江嘉兴邮电局开通并进网使用。此光传输系统是武汉邮电科学研究院按照目前我国邮电通信发展的特点并根据嘉兴局的实际需要研制生产的。本期工程以嘉兴局为母局并开通嘉兴～海盐、嘉兴～平湖、嘉兴～三水湾等四个系统。其光电合架端机的线路码型均采用1B1H插入比特方式,开通容量为720话路。用户可根据本地的实际情况与程控交换机配合逐渐扩容。本系统开通验收时,所有光电合架设备的传输特性、数据信道、公务通信等各项指标测  
          
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