switchboard

n. 配电盘,接线总机

One that announces, especially an electrical signaling device used in hotels or offices to indicate the sources of calls on a switchboard.

信号器，示号器宣告物，尤指饭店或办公室中使用的一种电子信号装置，用来指示交换台上的呼叫信号来源

The switchboard is manned twenty-four hours a day.

电话总机是一天24小时由人操纵的。