telephone trunk line 中文意思是什麼
telephone trunk line
解釋
電話主線-
High - low voltage switch box, dynamic trunk line, mcc, ats, walkie - talkie, broadcasting, fire alarming system, telephone system, etc
電氣:高低壓開關箱動力干線mcc ats對講廣播火警電話等系統。 -
The existing telephone systems occupy a fixed channel during calls while tdm technology allows several calls to be carried simultaneously on a trunk line
已有的電話系統在雙方通話時要佔有一個固定的通道。在通話過程中這條線路始終是被佔用的。
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