The attenuation per foot or meter for the cable is also required in order to compensate for the attenuation versus distance.
Likewise the cutoff frequency and waveguide loss are required for DTF, measurements of waveguide transmission lines.
It is much less expensive to monitor individual transmission lines for slight degradation and fix the problem early, before serious damage occurs. Transmitter performance is optimized by eliminating poorly performing components. Hand off anomalies are reduced by eliminating ping-ponging between weak/strong base stations.
Preventative maintenance has another set of benefits even more important than cost. Overall quality is improved giving greater customer satisfaction.
For example, connector corrosion can be detected early and weather seals replaced before moisture destroys expensive cables.
DTF finds these problems because the FDR technique can accurately detect very small performance changes within the transmission line.
Distance To Fault (DTF) is a performance verification and failure analysis tool used for antenna and transmission line service and maintenance.
Poorly tightened connectors and poor environmental seals are exacerbated by acid rain corrosion.
FDR is a transmission line fault isolation method which precisely identifies signal path degradation for coax and waveguide transmission lines.