Running a TDR test multiple times for the same line give different copper lengths. In this case we can not depend on SLTS to measure the broadband line length.
All lines that have been tested for TDR do not give a fixed length cable. the length cable vallue is read every time differently. A n actual cable length of around 4.5KM when measured by SLTS gave 2.2Km, 3.7 Km..etc. every time TDR value changes.