What is the difference between the ENA 6 series opt.100 (fault location) and the ENA opt.010 (time domain)?

(SUPPORTED MODELS IN BOLD: E5071C E5072A E5070B/71B E5070A/71A E5061A/62A E5061B)

Both options are aim to do time domain conversion. The ENA 6 series opt.100 focuses on to analyse the cable characteristics.
- The ENA 6 series opt.100 supports all features of the ENA opt.010 except for the gating function for time domain.
- The ENA 6 series opt.100 supports Fault location and Structural Return Loss (SRL) measurement with set up utility VBA programs.
E5061B do not have option 100 but have option 010 meanwhile E5061A/62A have option 100.