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近年来,随着铁路运输事业的飞速发展,铁路通信也有了长足进展,特别是长途通信已发展到960路载波机,微波、光缆、程控交换机也已应用在铁路通信网中。相比之下基层通信的发展却比较缓慢,组网方式还是共线,平均每个总机(每对线)接入16台选号式分机,通话阻塞严重,远远不能满足铁路运输的需要。铁道部的技术政策中提出:“加强区段和地区通信,发展基层运输各部门独立的专用通信系统,加快发展地区自动电话和铁路沿线各单位用户的交换电话网。”为此,把基层通信分为专用通信和公务通信两部分,把公务通信从
In recent years, along with the rapid development of railway transportation, great progress has been made in railway communications. In particular, long-distance communications have been developed to 960 carrier, microwave, optical fiber and program-controlled switches also used in railway communications networks. In contrast, the development of grass-roots communication is relatively slow, and the networking mode is still collinear. On average, each switchboard (each pair of lines) has access to 16 election-number extensions with serious blocking of calls, far from being able to meet the needs of railway transportation. According to the Ministry of Railways’s technical policy, “we will step up regional and regional communications and develop an independent dedicated communications system for grass-roots transport departments to speed up the development of regional auto-telephones and the exchange of telephone networks for users of all units along the railways.” To this end, Divided into dedicated communications and official communications in two parts, the official communications from