OMNISCANNER User Guide
5 - 14
Fiber Optic Measurements with OMNIFIBER
Length/Delay
The Length/Delay function measures a fiber’s length and propagation
delay. Length measurements are derived from the propagation delay
results using the GRI (Graded Refractive Index) at the appropriate
wavelength.
Propagation Delay is the measure of the time required for a signal to
advance from one end of the link to the other. When measuring
propagation delay, OMNISCANNER measures the round trip delay through
both fibers, and then divides the result by two, assuming that the
cables are equal in length.
OMNISCANNER measures the full length of the fibers
under test.
The LENGTH/DELAY screen displays the GRI @
1300 nm (nanometers) for multimode fiber and @
1310 nm for single-mode fiber.
The length limit and the actual derived length are
displayed in meters or feet.
The delay is displayed in nanoseconds (nS).
Press ESC to exit the LENGTH/DELAY screen.
Loss
The Loss function measures the signal loss in a fiber optic cable. The
adapters inject a signal into the fiber cable and OMNISCANNER and OMNI-
Remote measure the received signals at 850 and 1300 nm for multi-
mode fiber and 1310 and 1550 for single-mode fiber.
The LOSS screen displays the measured power in
dBm (decibels; one milliwatt reference) for each
wavelength.
The measured loss and limit values in decibel (dB)
are displayed for both wavelengths.
For dual fiber testing the arrows ▲▼ at the top of
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