Users Manual Owner manual

Versiv Cabling Certification Product Family
Technical Reference Handbook
256
 LIMIT: The maximum loss allowed by the selected test limit for
each wavelength the tester used.
 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.
 Tap to see help for this screen.
 If the results include warnings, tap to see the warnings.
 If a warning caused the test to fail, tap to see the warning.
Some conditions make the OTDR test fail even when all
measurements are within the limits.
 OPTICAL RETURN LOSS: This tab shows the ORL for the link.
Optical return loss is the total light reflected for all fiber and
components in the link. This includes the launch/tail cord events,
fiber segments, connectors, splices, and faults. If launch
compensation is on, this includes only the fiber between the
launch and tail connections, including the launch and tail events.
If not, it includes the fiber from the OTDR port connection,
including the OTDR port connection, to the end of the fiber. The
last connector is not included, unless it has a reflectance that is
below the reflectance of the fiber, as can occur with APC
connectors.
ORL is the ratio of the light from the source to the light that the
link reflects back to the source. ORL values are in units of positive
decibels. A larger ORL value shows that less light is reflected
back to the source. For example, a link with an ORL of 45
dB
reflects less light back to the source than a link with an ORL of
30 dB.
 LENGTH: This tab shows the length of the fiber and the
maximum length allowed by the test limit. If the distance to the
end of the fiber does not agree at all wavelengths, this tab
shows the longest length.