PTP 800 Series User Guide
Test ing t he ODU and I F cable
phn- 2513_004v000 ( Oct 2012)
5- 67
Measuring distance to fault
The distance to fault (DTF) test is used as a means of characterizing the cable installation,
but can also be used to determine the location of a fault in an installation.
Before performing this test, ensure that the test equipment is set up as described in
To measure distance to fault, proceed as follows:
1
Select the ‘DTF-return loss’ mode of the cable analyzer (
.
2
Select ‘DTF Aid’.
3
Use the up/down key to select and set the following:
Cable type
- select LMR400 (similar to CNT-400) or LMR600 (similar to
CNT-600) as appropriate.
F2
- select the highest frequency possible for the greatest resolution, 1600 MHz.
D1
and
D2
- set as appropriate for the specific installation.
4
Recalibrate the instrument.
5
Before connecting the ODU, obtain a plot of DTF loss. Compare it to an example
of a good installation (
6
Connect the ODU.
7
Observe the effect of the ODU connection on the DTF plot. Compare it to an
example of a good installation (
8
Keep a copy of the DTF plots so that they can be compared with subsequent
plots to determine if there is any degradation with time.
The absolute readings of DTF should be read with care, as many different variables affect
both distance and amplitude accuracy.
Содержание PTP 800 Series
Страница 1: ...Cambium PTP 800 Series User Guide System Release 800 05 02 ...
Страница 40: ...Licensing requirements About This User Guide 10 phn 2513_004v000 Oct 2012 ...
Страница 232: ...Limit of liability Chapter 3 Legal information 3 22 phn 2513_004v000 Oct 2012 ...
Страница 322: ...Radiation hazard assessm ent Chapter 4 Reference information 4 90 phn 2513_004v000 Oct 2012 ...
Страница 418: ...Replacing IRFU components Chapter 5 Installation 5 96 phn 2513_004v000 Oct 2012 Figure 1 1 0 IRFU components example ...
Страница 428: ...Replacing IRFU components Chapter 5 Installation 5 106 phn 2513_004v000 Oct 2012 ...
Страница 552: ...Configuring for FIPS 140 2 applications Chapter 6 Configuration and alignment 6 124 phn 2513_004v000 Oct 2012 ...
Страница 630: ...Using recovery mode Chapter 7 Operation 7 78 phn 2513_004v000 Oct 2012 ...
Страница 648: ...Glossary I V phn 2513_004v000 Oct 2012 ...