Chapter 4
Configuring the reflectometry test
Configuring the test in OTDR Expert
User Manual
770000102/08
25
If all the results lie within the thresholds (no result is in red or yellow), they
are displayed in green in the table and the icon
is displayed at the
right top of the trace.
Configuring the
Measurement
parameters
In the
Setup
page, press
Measur’t
softkey, or press
Next
if one param-
eter is selected in the current screen until the Measurement Setup page
displays.
The Measurement Setup page is divided into two parts: the
Parameters
box and the
Detection
box.
Measurement
parameters
Section Attenuation
dB/km
Displays the section slope in the table of results.
When the fiber is too short to measure the slope
accurately, no value is displayed (empty field).
dB
Displays the section Loss in the table of results. With
short fiber where the slope cannot be measured with
a good accuracy, the loss in dB is approximate and
displayed.
None
The section attenuation and Loss values are not
displayed in the table of results.
Index of refraction
Choice of group refraction index of the whole fiber.
User
Define for each wavelength (1310 SM, 1360-1510
SM, 1550 SM, 1625 SM) a refraction index of
1.30000 to 1.69999. The selection of an index alters
the value of the section AB (actual distance between
cursors A and B).
or,
If the actual distance between the cursors A and B is
known, enter its value under Section AB
to establish
the index of the fiber. Selection of this distance
causes the display of the indices. The extreme
distance values are given by the index values
(1.30000 à 1.70000).
Predefined
It is possible to choose one of the predefined values
given for certain cables. The corresponding indices
given in the table below are repeated on the screen.
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