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User Guide: PTP 800 Licensed Ethernet Microwave
Testing the installation
Recommended pre-power tests
Following the installation of the ODU, LPUs and the drop cable, but before
connecting and applying power to the CMU, the following tests are recommended:
x
Cable loss with ODU disconnected:
This test will ensure that the total cable loss, including loss from the LPUs, is
within acceptable limits.
x
Cable loss with the ODU connected:
This test will confirm that the cable contains no short circuit or open circuit.
x
Distance to fault (DTF) return loss with the ODU connected:
This test confirms the position of the LPUs in the cable run and confirms there
are no other points of discontinuity in the cable. By comparing a current plot
to a previously recorded plot, it is possible to detect any degradation over
time.
Test equipment
An RF cable analyzer such as an Anritsu 'Site Master' can be used 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, this equipment can be
used to identify the location of a fault in the cable.
Figure 5-17
tests described in this section.
Figure 5-17 Example of a cable analyzer
phn-1478_005v000
Apr 2010
is an example of a cable analyzer that is suitable for performing the
Testing the installation
5-77
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