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Chapter 7: Use the OTDR
Settings for OTDR Tests
155
Fiber Type
Settings IR
: The tester uses the index of refraction to calculate the
optical length of the fiber. Each fiber type includes the
value specified by the manufacturer. To use a different IR,
make a custom fiber type. See the Technical Reference
Handbook.
Backscatter
: Backscatter is the backscatter coefficient. The
tester uses this value to calculate the reflectance of events
for OTDR tests and the overall ORL for the link. Each fiber
type includes the value specified by the manufacturer. To
use a different backscatter value, make a custom fiber
type. See the Technical Reference Handbook.
Test Limit
Select the correct test limit for the job. Generic limits, such
as
General Fiber
and
Document Only
, let you do tests
when no industry-standard limit is applicable and you do
not want to make a custom limit. These limits are in the
Miscellaneous
group. To see a different group of limits,
tap
MORE
, then tap the name of a group.
Some test limits use the measured length of the fiber to
calculate a limit for loss.
Test Limit
Settings
This item shows only if the selected test limit calculates a
loss limit for each link. For such limits, enter the number of
connectors and splices in the link. See the Technical
Reference Handbook.
Table 7. Settings for OTDR Tests (continued)