Chapter 11: The OptiFiber Pro OTDR Module
Settings for OTDR Tests
317
Bi-directional This setting shows only if you select SmartLoop OTDR
(Auto) or SmartLoop OTDR (Manual) for the Test Type.
Off: The tester does the SmartLoop test in only one
direction.
On: The tester does the SmartLoop test in both directions
and automatically calculates bi-directional averages of loss.
See “Bi-directional SmartLoop Tests” on page 383.
Launch
Compensation
Tap the control to turn the launch compensation function
on or off. See“About Launch and Tail Cords” on page 319.
This setting does not show for the SmartLoop test because
it is always enabled for that test.
Macrobend
Detection
(singlemode
only)
On: The tester identifies bends. To identify a loss event as a
bend, the tester compares the event’s loss at two
wavelengths, such as 1310 nm and 1550 nm. If the loss is
more at the longer wavelength and is more than the
macrobend threshold, the tester identifies the event as a
bend. This setting is On by default.
For the Auto OTDR test, the threshold for the loss
difference is 0.50 dB. To use a different threshold, set up a
Manual OTDR test. See “Macrobend Setup” above.
Notes
A bend always causes a FAIL result. If you want a
PASS result for a link that has a bend, turn off
Macrobend Detection.
Off: The tester does not identify bends. Bends show as loss
events in the results.
Wavelength Select the wavelengths you want to use. You can do tests
at one or all of the wavelengths supported by the module
you selected. The FaultMap and FiberInspector tests do not
have this setting.
Note
If you use only one wavelength, the Macrobend
Detection function will not identify bends.
-continued-
Table 12. Settings for OTDR Tests (continued)
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