术语 | superposed ringing |
释义 | superposed ringing 叠加振铃 Partyline telephone ringing in which a combination of alternating and direct currents is utilized, the direct currents of both polarities being provided for selective ringing. 其中利用交直流组合实现的一种共线电话振铃,采用两种方向的直流电来实现选择振铃。同superimposed ringing。 |
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