Which of the following statements about precautions for optical fiber installation are correct?
Indoor Unit (IDU) in split microwave consist of 2 different unit which are Indoor service board unit and Indoor IF signal processing unit.
Material checking can be ignored during site installation, because completeness check has been performed by dedicated personnel before material are delivered to the site.
Site environmental risks need to be assessed by all personnel on the day of visiting the site, or be assessed on the next day.
LOS survey methods are classified into three types: LOS technical analysis, microwave LOS simul-ation and traditional LOS survey.