目前国外工作面和采区普遍采用扩音电话,有的国家也用无源电话、载波电话和感应电话,而空间波无线电话尚处在研究试验阶段。现将各主要产煤国家工作面和采区通讯现状介绍如下。法国法国工作面通讯设备有三种形式: 1、扩音电话:主要使用Phoniles型电话,技术规格见表1。 At present, overseas working surfaces and mining areas generally adopt the amplifying telephone, and some countries use passive telephone, carrier telephone and induction telephone, while the space wave wireless telephone is still in the research and experimental stage. Now the major coal-producing countries face and mining area present situation introduced below. There are three forms of communication equipment in France and France: 1. Phono Phones: Phoniles are used mainly for the technical specifications in Table 1.