switchboard
/ˈswɪtʃbɔ:d; `swɪtʃˌbɔrd/ n
(staff controlling a) central panel with a set of switches for making telephone connections or operating electrical circuits 电话交换台、 总机或配电板（工作人员）
on duty at the switchboard 在电话交换台值班
Protesting viewers jammed the BBC switchboard. 观众抗议的电话使英国广播公司的总机应接不暇.
[attrib 作定语]
switchboardoperators 交换台接线员.