Versiv Series Cabling Certification Product Family
Technical Reference Handbook
246
When a loss measurement is negative. This occurs when there
was a problem when you set the reference. For example, an
endface was dirty or the testers were cold.
WCaution
Do not disconnect the test reference cords from the
modules’ output ports after you set the reference. If
you do, you will change the amount of optical
power that enters the fiber and the reference will
not be correct.
Good Reference Values
For Smart Remote and Loopback modes, these are the typical
ranges for reference values:
Multimode 50/125 μm fiber: -19.4 dBm to -26.5 dBm
Multimode 62.5/125 μm fiber: -17.5 dBm to -23.0 dBm
Singlemode fiber: -1.0 dBm to -6.0 dBm
For Far End Source mode with a CertiFiber Pro source, reference
values must be in these ranges:
Multimode 50/125 μm fiber: -19.4 dBm to -26.5 dBm
Multimode 62.5/125 μm fiber: -17.5 dBm to -23.0 dBm
Singlemode fiber: -1.0 dBm to -9.7 dBm
If your reference value is outside of the applicable range given
above, clean and inspect all connectors then set the reference
again. Do this even if the tester lets you use the value.
If your test reference cords and connectors are in good condition,
and you use the correct procedure to set the reference, the
reference value will not change by more than approximately
0.4 dBm.
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