FibeAir® IP-10G
Installation Guide
Ceragon Proprietary and Confidential
Page 40 of 71
10.8.3
Polarization Alignment
Polarization alignment is required to verify that the antenna feeds are
adjusted, ensuring that the antenna XPD (Cross Polarization Discrimination) is
achieved.
Polarization adjustment should only be performed on one antenna.
1 Disconnect the V cable from the V RFU and connect it to the H RFU.
2 Check the RSL achieved in the H RFU and compare it to the RSL achieved
by the V RFU.
3 Verify that the XPI (Cross Polarization Interference) is at least 25dB
where:
sites.
both
at
used
ons
polarizati
orthogonal
with
RSL
Link
RSL
sites.
both
at
used
on
polarizati
same
with the
RSL
Link
RSL
XPOL
POL
XPOL
POL
RSL
RSL
XPI
4 If the XPI is less than 25dB, adjust the feed polarization by opening the
polarization screw and gently rotating the feed to minimize the RSL
XPOL
.
Note:
Polarization alignment is not always possible since the
RSLXPOL might fall below the sensitivity threshold of the
RFU.
10.9
Displaying XPI Values
The current XPI value can be displayed in the Web EMS and the CLI (the value
is valid only when the modem is locked on a signal).
Using CLI, enter the command
xpi
.
Using Web-Based Management:
To view the current XPI value, select
Configuration > Radio > Radio
Parameters
from the menu bar on the left side of the main
management page.
