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Chapter 6: Certify Fiber Cabling
Requirements for Reliable Fiber Test Results
105

Multimode 50/125 μ m fiber: -19.4 dBm to -26.5 dBm
 Multimode 62.5/125 μ m 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.
How to See the Reference Values

After you set the reference, tap
View Reference
on the
SET
REFERENCE
screen.

After you do an Autotest, tap the result window for a fiber,
then tap
VIEW REFERENCE
.
About Test Reference Cords and Mandrels
Use only test reference cords (TRCs) that have low loss:

Maximum loss for multimode TRCs:

0.15 dB

Maximum loss for singlemode TRCs:

0.25 dB
To make sure your test results are accurate as possible:

Inspect the endfaces of the TRCs every 24 to 48 tests and clean
them when necessary.

Use the
TRC VERIFICATION
wizard available for the
1 Jumper
and
3 Jumper
reference methods to measure the losses of the
TRCs. The losses of the TRCs are included in the loss
measurements for links, so you must make sure the losses are
very small. The wizard saves the results of the TRC tests to show
that your TRCs were good. IDs for these results start with “TRC”,
show the date and time of the test, and have an for the test
result.