Cisco CX-FEIP-1TX= Installation and con?guration Guide de l'utilisateur Page 390

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Testing the ODU and IF cable Chapter 5: Installation
5-68
phn-2513_004v000 (Oct 2012)
DTF return loss example
This example shows typical DTF return loss in a good installation. The distances from the
test equipment to first LPU (marker M2), and then the second LPU (marker M3) are
clearly shown. The cable between them shows no discontinuity. There are two plots:
Figure 86 is a plot of DTF return loss before the ODU is connected. The final peak
(marker M1) is the position of the cable open circuit.
Figure 87 is a plot of DTF return loss after the ODU is connected. The final peak
remains in the same position but is now reduced in amplitude because less signal is
reflected, as a consequence of the better match of the ODU.
Figure 86 DTF plot for a 17 meter cable with no ODU
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