目前,我国大多数煤矿都采用磁石电话作为井下通讯工具(有少数矿采用共电电话)。由于这种通讯方式占用线路多,通讯电缆芯线的数目限制了井下电话的台数,因而井下通讯网很不完整。井下工作人员常常为打一个电话要跑几百米远,很 At present, most coal mines in our country use magnet telephone as downhole communication tool (a few mines use common telephone). Because of this method of communication occupy more lines, the number of communication cables limit the number of underground telephone, underground communication network is therefore not complete. Downhole workers often run a few hundred meters to make a call, very