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由机电部石家庄54所总承包的山东煤矿微波通信干线工程,经国家验收委员会验收后,山东统配煤矿通信专用网技术于1991年12月20日通过专家鉴定。该通信网是山东省煤矿工业专用通信网,全线13个微波站,约400公里,覆盖了全省统配煤矿总产量的90%以上。在专用通信网内电话自动交换,一次等位拨号,并实现调度电话、会议电话、文字图象
By the Electrical and Mechanical Services Department Shijiazhuang 54 general contracting Shandong coal mine microwave communication trunk line project, the acceptance by the State Commission for Acceptance, the Shandong coal mine communications with special network technology on December 20, 1991 through expert identification. The communications network is a coal mine industry in Shandong Province dedicated communications network, across the board 13 microwave stations, about 400 km, covering the province’s total output of coal mines more than 90%. Automatic exchange of telephone calls in a private communications network, an equal-digit dialing, and scheduling calls, conference calls, text images