Chapter 14: Configuration Guide (CLI)
Configuring XPIC (CLI)
phn-3963_004v000
Page 14-208
Configuring XPIC (CLI)
Note
This option is only relevant for PTP 820C units.
This section explains how to configure XPIC and includes the following topics:
Configuring the Antennas (CLI)
Configuring the Radio Carriers for XPIC (CLI)
XPIC Overview (CLI)
Cross Polarization Interference Canceller (XPIC) is a feature that enables two radio carriers to use
the same frequency with a polarity separation between them. Since they will never be completely
orthogonal, some signal cancelation is required.
In addition, XPIC includes an automatic recovery mechanism that ensures that if one carrier fails,
or a false signal is received, the mate carrier will not be affected. This mechanism also ensures that
both carriers will be operational, after the failure is cleared.
To configure and enable XPIC, first configure the antennas and then configure the carriers, as
described below.
Configuring the Antennas (CLI)
To configure the antennas:
1.
Align the antennas for one carrier. While you are aligning these antennas, mute the second
carrier. See
Configuring the Radio Parameters (CLI)
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.
3.
Record the RSL
wanted
and mute the first radio carrier at each end of the link.
4.
Unmute the second (orthogonal) radio carrier which was muted during the antenna alignment
process.
5.
Determine the XPI, by either of the following two methods:
o
Measure the RSL of the second carrier (the “RSL
unwanted
”). To calculate the XPI, subtract
RSL
unwanted
from the RSL
wanted
.