A passive radio link deflection, or passive repeater is a plant

Outside plant

In telecommunication, the term outside plant has the following meanings:*In civilian telecommunications, outside plant refers to all of the physical cabling and supporting infrastructure , and any associated hardware located between a demarcation point in a switching facility and a demarcation...

 for the implementation of a microwave link, in which because of an obstacle in the signal path no direct line of sight

Line-of-sight propagation

Line-of-sight propagation refers to electro-magnetic radiation or acoustic wave propagation. Electromagnetic transmission includes light emissions traveling in a straight line...

 microwave link is possible. It has the advantage over the installation of a microwave radio relay station with active components, that at the place of the installation no electricity supply is required and that no further frequencies are needed (at repeater

Repeater

A repeater is an electronic device that receives asignal and retransmits it at a higher level and/or higher power, or onto the other side of an obstruction, so that the signal can cover longer distances.-Description:...

 stations with active components usually different frequencies for reception and transmission are used, in order to prevent feedbacks).