Cambium Networks PTP 800 Series, User Manual

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Test ing t he ODU and I F cable Chapt er 5: I nst allat ion
5- 60 phn- 2513_004v000 ( Oct 2012)
Testing the ODU and IF cable
Applies to ODU deployments only.
This section describes how to perform pre-power tests on the ODU, LPUs and the IF cable.
Recommended pre-power tests
After installation of the ODU, LPUs and the IF cable, but before connecting and applying
power to the CMU, perform the following tests:
•
Cable loss with ODU disconnected:
Confirm that the total cable loss, including loss from the LPUs, is within acceptable
limits.
•
Cable loss with the ODU connected:
Confirm that the cable contains no short circuit or open circuit.
•
Distance to fault (DTF) return loss with the ODU connected:
Confirm the position of the LPUs in the cable run and confirm that there are no other
points of discontinuity in the cable. To detect any degradation over time, compare a
current plot to a previously recorded plot, if available.
Test equipment
Use an RF cable analyzer such as an Anritsu ‘Site Master’ to confirm that the installed
cable between the ODU and the CMU has the correct loss and does not have any short or
open circuits. If the cable is faulty, use this equipment to identify the location of a fault in
the cable.
Figure 80 is an example of a cable analyzer that is suitable for performing the tests
described in this section.