Use the OTDR
OTDR Results
217
Overall Loss: The loss of the cabling. This does not include the
OTDR connection and the loss of the last event. If Launch
Compensation is on, the overall loss includes the launch and tail
connectors, but not the launch and tail fibers.
If you did the test at two wavelengths, the tester shows the
highest loss of the two wavelengths.
N/A shows for the Overall Loss if the tester cannot measure the
loss. This can occur when events are too close together or when
there is a large reflective event near the end of the fiber.
Fiber Length: The length of the fiber. The units show in meters
(m) or feet (ft). If Launch Compensation is on, the length does not
include the length of the launch and tail cords.
PASS/FAIL: The overall result for the fiber.
• PASS: All measurements are within the test limits.
• FAIL: One or more measurements exceed the limit.
Refer to Figure 82:
Length of the tail cord (top) and launch cord (bottom).
A non-reflective loss event:
: An APC connector or a splice. Measurements for the event
are all within the test limits. If the event has negative loss, it is a
Gainer.
If Macrobend Detection is Off, this could be a bend. If the
event is a bend, and Macrobend Detection is On, the
EventMap shows the bend icon. Macrobend detection is
available only for single-mode fibers.
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