User's Manual

CrossFire iDAS – All-Digital Transport System
User Guide
© SUNWAVE SOLUTIONS LIMITED 2017 56 Version 1.0
8.5. Isolation Detector
Antenna to antenna isolation is a key consideration in the design of Crossfire NPRU System. Sufficient
isolation is required to ensure that interference between antennas is kept within acceptable levels (Tx
antenna to Rx antenna isolation shall be over 45dBm; higher values are preferred for equipment to operate
effectively).
The Crossfire NPRU system provides isolation detector for measuring isolation between antennas via the
following procedures:
1. In the AU WebOMT, go to Maintenance > Engineering > Isolation Detector.
2. Select Tx1 in Isolation ANT Switch, type Detecting Frequency and then enable Isolation Detector
Switch.
3. Click Set in pop-up window to validate the paramete. And then Query all to obtain measured values in
Rx1/2 Isolation between Tx and Rx.
4. Increase antenna to antenna isolation if needed
NOTE: Physical separation, polarization and optimization of antenna patterns can increase isolation.
5. Select Tx2 in Isolation ANT Switch and repeat step 2-4.
Figure 8-10 Isolation Detector
8.6. Alarm Parameters Setup
After the radio frequency band configuration is completed, set up the alarm parameters via the following
procedure:
1. In the WebOMT, select the Alarms tab.
2. Set the statuses of the optical transceiver one by one.
If there is an optical path connection, enable the basic device alarms, such as Power Interruption
Alarm, Battery Failure Alarm, Movement Alarm, etc. For alarms related to band properties, such as
LO Unlocked Alarm, DL ALC Over Range Alarm, OP Transceiver Failure Alarm, etc., only enable
those associated with modules which have an input signal, to avoid unnecessary alarms. See Figure
8-10 for details.