EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 146)

Analyzing Traces and Events
132 OTDR
Event Pane
The events table lists all the events detected on the fiber. An event can be
defined as the point at which change in the transmission properties of light
can be measured. Events can consist of losses due to transmission, splices,
connectors or breaks. If the event is not within the established thresholds,
its status will be set to “warning” or “fail”.
If you press and hold the row corresponding to a specific event or fiber
section for a few seconds, the application will display a tooltip identifying
the item (for example, Non-reflective fault). If an asterisk appears next to
the event symbol, the tooltip will also show “(*:Modified)” to indicate that
this event has been modified manually.
If the asterisk appears next to the event number, “(*:Added)” will appear to
indicate that this event has been inserted manually.
For each item listed in the events table, information is displayed:
³
Type: Various symbols are used to describe different event types. For a
more detailed description of symbols, see Description of Event Types
on page 293.
³
No.: Event number (a sequential number assigned by the OTDR test
application) or, in parentheses, the length of a fiber section (the
distance between two events).
³
Loc.: Location; that is, distance between the OTDR and the measured
event or between the event and the beginning of the fiber span.
³
Loss: Loss in dB for each event or fiber section (calculated by the
application).
³
Refl.: Reflectance measured at each reflective event along the fiber.