Fluke OF-500-01 OptiFiber, Technical Reference Handbook, Page: 262 / 278

OF-500 OptiFiber Certifying OTDR
Technical Reference Handbook
B-6
3 Jumper Method
Results from the 3 Jumper method account for the loss of
only the fiber in the link. This method is suitable for testing
links where the fiber's loss is the majority of the total loss,
such as when the link is very long or patch cords are not
used at either end. Appendix A shows the names of the
standards that define the 3 Jumper method.
Reference connections for the 3 Jumper method cancel out
the effects of two connections and three reference test
cords in each fiber path, as shown in Figure B-3.
The test connections add the fiber in the link to each path.
Loss results for the 3 Jumper method therefore represent
only the fiber in the link.
Because the results omit both connections in the link,
industry standards do not recommend the 3 Jumper
method for testing premises fiber, where patch cords are
typically used at both ends of the link and connector loss is
a large portion of the total loss.