Fluke Networks CertiFiber Pro Users Manual - Manual (Page 110)

Versiv Cabling Certification Product Family
Technical Reference Handbook
88
The tester compares the length of the shortest pair to the limit,
and gives the test a PASS result if the pair is not too long. The
lengths of the other pairs are gray on the screen.
 The tester gives a PASS result if the shortest length and the
longest delay skew do not exceed their limits.
Resistance
Resistance results show the DC loop resistance for each wire pair.
The remote puts a short at the end of each pair to make the
loops. A pair’s resistance depends on the quality of the contacts in
the connector, the length of the pair, and its wire gauge. Figure
37 shows the resistance results screen.
Resistance problems always affect other tests. For example:
 A link that is too long has too much resistance and will fail the
length test.
 High-resistance connections reflect signals, which causes the
return loss test to fail. Use the tester’s HDTDR analyzer to see
the distance to the bad connection.
 A difference in the resistances of the wires in a pair causes the
impedances of the wires to be unbalanced, which can cause
TCL tests to fail.