The FDR measurement mode provides a means of characterizing
impedance mismatches in the home wiring and is used to detect potential
faults that could disrupt signal transmission.
A frequency domain reflectometry (FDR)
test reveals the location and severity of sources of reflections. This
facilitates the replacement of faulty cable and components or the repair
of craftsmanship problems. FDR is used with the JDSU
LST-1700 Signal Transmitter which provides a source for a frequency domain
reflectometry test of home wiring to help locate faults.