visual busy-lamp

基本解释占线灯信号，占线指示灯

网络释义

1)visual busy-lamp,占线灯信号，占线指示灯2)hold lamp,占线指示灯3)engaged lamp,占线信号灯4)busy lamp,占线信号灯，忙灯5)busy lamp,占有线指示灯6)trunk congestion lamp,中继线占用指示灯