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在实际工作中,常常遇到用户申请安装自动电话,但由于线路已装满而使用户得不到安装的情况。新建或改建市话线路(例如:增设电缆或改装架空线路的杆面,增设横担或调整杆高等)将需要很大的投资和较多的时间,这种作法很不经济。以前解决这个问题的方法是:装用户分机,即两个用户共用一条用户线路。但这样作有三个主要缺点:1、失去了机动灵活性。一个用户的通话受到另一个用户的牵制,同线的两个用户不能同时通话;
In actual work, users frequently apply for installing an auto-phone, but the user may not get installed because the line is full. It will be uneconomic to invest or spend more time by building or rerouting local lines, such as adding cables or modifying the face of overhead lines, adding cross ties or adjusting bars. The previous solution to this problem was to install a user extension, that is, two users share one user line. However, there are three major disadvantages to doing this: 1. Lost maneuverability. One user’s call is controlled by another user, and two users at the same line can not call at the same time;