Exfo FTB-7000 OTDR Series for FTB-500 Bedienungsanleitung PDF herunterladen (Seite 251)

100

101

Analyzing Bidirectional Traces

OTDR 237

Analyzing the Fiber on a Specific Fiber Span

If you want to focus your fiber analysis on a specific fiber span, you can

define events (new or existing) as span start and span end.

Span start and span end are defined on both the A->B and B->A trace.

Traces are aligned on the span start of the A->B trace and on the span end

of the B->A trace. The two other span events are not used in the

bidirectional analysis.

Changes to the span start and span end modify the events table. The span

start becomes Event 1 and its distance reference becomes 0. All events on

both traces are numbered on the trace display. The cumulative loss is

calculated within the defined fiber span only.

Note: To keep a set fiber span during trace reanalysis, activate the fiber span

delimitation memory (for details, see Saving the Span-Start and Span-End

Information on page 85); otherwise, the span start and span end markers

are reset to zero in the process.

You can use the zoom control buttons to modify the trace display. For more

information, see Using Zoom Controls on page 137.

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