User Guide for FibeAir® IP-20 All-Outdoor Products, CeraOS 10.5
Page 158 of 825
Ceragon Proprietary and Confidential
Figure 100: XPIC Configuration Page
2 In the XPIC Configuration page, select
Enable
in the
Admin
state
field and
click
Apply
.
To disable XPIC, select
Disable
in the
Admin state
field and click
Apply
.
3.6.4
Performing Antenna Alignment for XPIC
1 Align the antennas for the first carrier. For a 2+2 XPIC configuration (or a 4x4
MIMO configuration), align the antennas for the first carrier on the upper IP-
20C or IP-20C-HP units. While you are aligning these antennas, mute the
second carrier. See
Configuring the Radio Parameters
. For a 2+2 XPIC
configuration (or a 4x4 MIMO configuration), mute all the carriers except the
first carrier on the upper IP-20C or IP-20C-HP units.
2 Adjust the antenna alignment until you achieve the maximum RSL for the first-
carrier link (the “RSL
wanted
”). This RSL should be no more than +/
-2 dB from
the expected level.
Record the RSL of the first carrier as the “RSL
wanted
”).
3
Measure the RSL of the second carrier and record it as the “RSL
unwanted
”).
Note:
To measure the second carrier, leave the Voltmeter connected to the
BNC connector. In the Radio Parameters page of the Web EMS
(
), change the
RSL Connector Source
field from
PHYS1
to
PHYS2
(or vice versa). The BNC connector will now measure RSL from
the other carrier.
4 Determine the XPI, using either of the following two methods:
◦
To calculate the XPI, subtract RSL
unwanted
from the RSL
wanted
.
◦
Read the XPI from the
Modem XPI
field of the Radio Parameters page in
the Web EMS. See
Viewing the Radio Status and Settings
5 The XPI should be between 25dB and 30dB. If it is not, you should adjust the
OMT assembly on the back of the antenna at one side of the link until you
achieve the highest XPI, which should be no less than 25dB. Adjust the OMT
very slowly in a right-left direction. OMT adjustment requires very fine
movements and it may take several minutes to achieve the best possible XPI.
Note:
As an extra step, to check the veracity of the initial measurements, you
can mute the first carrier and unmute the second carrier on the upper
IP-20C or IP-20C-HP units on both sides of the link. Then measure the
RSL of the second carrier link (the “RSL
wanted
”), measure the RSL of
the
first carrier (the “RSL
unwanted
”) and determine the XPI. The XPI should
match the XPI with the second carriers muted.