سلام معنی line-of-sight تو این جمله چی میشه

Question

Speed
control of air-moving devices, rack- or frame-level acoustic treatments,
and reduction of line-of-sight noise emissions are common
techniques to reduce datacom equipment noise.

Answer 1

خط دید, وسعت دید 

مسافتی که بدون موانع میشه دید.