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在通信站的设计中,往往有些地区较小的试验室,虽有自动交换机,但没有人工交换台。呼叫某些长途用户,必须经过其它地区人工交换台来进行转接。这就要求电话所与该地区没有专用半自动呼叫回线。目前,路内还没有一个定型的专用半自动回线呼叫电路。为便于交流和探讨,特将海林通信站半自动回线电路设计方案做一简要介绍。
In the design of communication stations, there are often smaller laboratories in some areas, although there are automatic switches, but no artificial exchange stations. Call some long-distance users, must go through other parts of the exchange station to carry out the transfer. This requires that there be no dedicated semi-automatic call back lines between the telephone station and the area. At present, the road has not a dedicated semi-automatic return line call circuit. In order to facilitate the exchange and discussion, special Hailin communication station semi-automatic loop circuit design to make a brief introduction.