最新刊期
      卷 ， 期 1 ， 1991
      • Zhang Xu
        Issue 1, Pages: 1-7(1991) DOI: 10.13756/j.gtxyj.1991.01.001
        摘要：This paper briefly discusses some preliminary considerations for planning the optical fiber LAN and MAN. These include: the choice for computer data communication vs integrated service digital communication; choice of the digital rate and network diameter; choice of optical fiber vs conductor cable as transmission medium; choice of network topology architecture and protocols; application on technoloy; consideration on LAN and MAN’s access to public exchange network; tetherless access of personal portable radio communicator to LAN and MAN; and consideration on the joint operation of lightwave and microwave networks.  
          
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      • Issue 1, Pages: 2(1991)
        摘要：<正> 国务委员、国家科委主任宋健和国务院副秘书长徐志坚在湖北省省长郭树言等省市领导陪同下,视察了武汉邮电科学研究院并参观了该院的“武汉电信器件公司”。宋健等听取了武汉邮电  
          
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      • Wang Zhenying
        Issue 1, Pages: 8-15(1991) DOI: 10.13756/j.gtxyj.1991.01.002
        摘要：According to the wordage of network evolution of three paradigms （FDM, STM & ATM）, this paper clarifies briefly the status of STM network and the new concepts of Asynchronous Transfer Mode of ATM networ（?）. It emphatically points out the characteristics of SDH and its position in the STM & ATM networks, and specifies the significance of network frequency and plesiochronous operation, The author wishes to correct the falseness of "mistaking ADH for PDH".  
          
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      • Mao Qian
        Issue 1, Pages: 16-22(1991) DOI: 10.13756/j.gtxyj.1991.01.003
        摘要：This paper describes generally the new developments in Integrated Service Digital Network （ISDN） performance study of CCITT Study Group ⅩⅧ during the initial meeting and interim meeting of period 1989～1992. The paper also introduces mainly the amendments of the existing recommendations, and the new draft recommendations from three aspects: the error performance, the timming performance and the availability performance.  
          
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      • Yang Yigang
        Issue 1, Pages: 23-28(1991) DOI: 10.13756/j.gtxyj.1991.01.004
        摘要：A new design of digital multifrequency signal receiver by using the method of decimation of digital signal is proposed in this paper. With this method, the filter bank for seperating frequencies can be operated at lower sampling rate and the volume of computations required for processing can be reduced considerably. The filter bank of this method is implemented with polyphase network in connection with DCT and DST. The outputs of DCT and DST are orthogonal to each other, thus, meet the requirement for detection. The multifrequency receiver designed with this method has the property of lower rate of processing and high calculation efficiency.  
          
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      • Le Zhongdao
        Issue 1, Pages: 29-42(1991) DOI: 10.13756/j.gtxyj.1991.01.005
        摘要：In this paper the basic physical process, mathematical statistics, the effects of finite register length and trigger phase jitter, and the basic performance evaluation in digital averaging estimation processing techniques are discussed in detail for the application in the optical time-domain reflective measurements. Meanwhile it is demonstrated with the data of an example that the performances of digital averaging estimation processing techniques employing 16-bit word length minicomputer are far more better than the boxcar averager analog processing techniques.  
          
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      • Tang Jingyuan Ma Hengjian
        Issue 1, Pages: 43-52(1991) DOI: 10.13756/j.gtxyj.1991.01.006
        摘要：By using mode coupling and lightwave propagation theory, this paper analyzes the transmission characteristics of Mach-Zehnder interferometric optical periodic filter and its application in OFDM transmission systems, then, an modified structure is proposed. The theoretical analysis shows that the modified filter has better characteristics, and can be used in OFDM multi-demultiplexing technology.  
          
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      • Sn Bin
        Issue 1, Pages: 53-58(1991) DOI: 10.13756/j.gtxyj.1991.01.007
        摘要：This paper describes the monitoring/controlling function, the overall configuration and design characteristics for Hang—Da optical fiber cable transmission system between Hangkou and Wuchang. It has complete function for traffic monitoring/controlling,and all the signals of the system are transmitted through Optical fiber Cable  
          
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      • Liu Sheng Xian Youqing Jin Zhutao
        Issue 1, Pages: 59-61(1991) DOI: 10.13756/j.gtxyj.1991.01.008
        摘要：By inquiring the installation and maintenance of optical fiber cables in the field of cable selection, cable installation, cable jointing and route test, some useful means were putted forward in this paper.  
          
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      • Issue 1, Pages: 62-63(1991) DOI: 10.13756/j.gtxyj.1991.01.009
        摘要：<正> 武汉邮电科学研究院研制成了565Mbit/s光纤线路复用设备。该设备于1990年11月曾在北京举办的第5届国际电讯、计算机及电子展览会上展出,受到了国内外同行的关注和好评。该设备的复接方式是按C CITT建议G.954附件B要求设计的,即4×139.264Mbit/s系统的数字复接方式,传输容量为7 680话路;4个139.264Mbit/s支路电接口符合C CITT建  
          
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