EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 252)

Analyzing Bidirectional Traces
238 OTDR
Analyzing the Fiber on a Specific Fiber Span
To set a fiber span:
1. From the main window, press the Span button.
2. Select the Span Start or Span End option according to the type of span
event you want to create for the A->B and B->A trace.
3
4
Ratio of matched events between
A-> B trace and B->A trace