Certifying Fiber Optic Cabling
Autotest in Loopback Mode 5
5-29
A The overall result for the test.
B Overall results for the fiber (E is PASS, F is FAIL):
Loss (Output -> Input): Loss on the fiber connected
between the tester’s output and input ports.
Length: The length of the fiber between the tester’s
output and input ports. To see the propagation delay,
select the length result. Propagation delay is the time
taken for a signal to travel between the tester’s output
and input ports. Propagation delay is measured in
nanoseconds (ns).
C The overall result for the loss measurement.
D The measured loss for the fiber.
Note
If loss is negative, set the reference again and retest
the cabling. See Chapter 7 for more information on
negative loss.
E The maximum loss allowed by the selected test limit.
F The difference between the limit and the measured loss.
Margin is negative if the loss exceeded the limit.
G Loss meters for the two wavelengths. Values in the red
zone exceed the selected test limit.
H Press L View Ref. to view the reference information.
Figure 5-13. Loopback Mode Summary and Loss Result Screens (cont.)
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