Chapter 12: The OptiFiber Pro HDR OTDR Module
HDR OTDR Results
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LIMIT: The maximum loss allowed by the selected test limit for
each wavelength the tester used. N/A shows if there is no test
limit for the measurement.
MARGIN: The difference between the limit and the measured
loss for each wavelength the tester used. Margin is negative if
the loss exceeds the limit. N/A shows if there is no test limit
for the measurement.
Tap to see help for this screen.
To see details for the event before or after this one, tap or
next to Events.
SEGMENT ATTENUATION: This tab shows the attenuation
coefficient of the fiber segment before the event. This is the
attenuation per unit of length for the segment. This value
shows as N/A if the tester could not measure it accurately.
This can occur for short segments or if the connector before
the segment has too much tailing.
REFLECTANCE: Reflectance is the return loss for one event. It
is the ratio of the light reflected at one point on the fiber to
the light that gets to that point from the source. Reflectance
values are in units of negative decibels. A smaller (more
negative) reflectance value shows that less light is reflected
back to the source. For example, a reflectance of -45 dB shows
for a good multimode connection. A reflectance of-20 dB
shows for a bad multimode connection that reflects more
light back to the OTDR.
Reflectances that exceed the measurement range of the tester
show a ">" (greater than) symbol. If any reflection shows ">",
ORL shows "<" (less than).
Reflectances from hidden events can possibly show “<" because
the tester cannot measure the backscatter before the event.
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