CRITICALPOINT 700/800MHZ BDA/DAS/BBU V3 USER MANUAL
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568 Gibraltar Drive, Milpitas, CA 95035 | +1 408 526 0180
Rev. 1-0-2 Rev. Date: 11-1-2024
Oscillation Shutdown Alarm, Oscillation Gain Reduction Alarm
Oscillation has been detected in the system and action is required to restore original
performance. When system detects oscillation, it will test the isolation, and set Gain according
to the new isolation, if the Gain can be set to meet the new isolation number (Gain = Isolation –
20dB). Then the system will send an Oscillation Gain Reduction alarm. If the desired gain is out
of the setting range, the system will shut down the PA and send an Oscillation Shutdown Alarm.
To recover from Oscillation Gain Reduction alarm and Oscillation Shutdown Alarm, the user
must evaluate the system isolation and fix the isolation issue first (refer to isolation / oscillation
troubleshooting section). Then go to <Tools – tools> page and click <Oscillation Alarm Reset>.
Bad isolation is possibly caused by:
1)Not enough isolation between Donor antenna and Service antenna(s).
2)Poorly installed components such as bad coaxial cable or passives which leak RF.
3)Interference by other systems – in-building commercial / neighbor units. Evaluate the RF
environment on the rooftop and within the DAS coverage area to ensure no interference from
adjacent/neighboring systems.
A fault is detected in the Digital Clock Lock module. A critical Hardware issue is detected.
Contact Technical Support.
A fault is detected in the Phase-locked Loop module. A critical Hardware issue is detected.
Contact Technical Support.
DT ANT Disconnection Alarm
The Composite Downlink Input Power is lower than the DT ANT Disconnection low threshold.
This alarm will always use dual band composite input power measurement when the BDA is
licensed for dual band. The DL P_in Low alarm, on the other hand, is configurable per band.
When the Composite Downlink Input Power is higher than the DT ANT Disconnection low
threshold, the system will automatically clear this alarm. Check donor antenna installation.
When the internal device temperature is higher than the user-defined threshold. The
temperature reading, and threshold can be found in the “Overview” page. The default setting is
recommended. Only modify if local code requires to.
Check the environmental temperature and the threshold setting. Correct issue.
When an external alarm is set to Normally Open, it will trigger alarm when external source is
short. When an external alarm is set to Normally Closed, it will trigger alarm when external
source is open. Note: External Alarm 5 is configured for the Door Alarm from the factory.
Check the external circuitry status by a voltage meter to confirm the alarm status.
Note: this external input must be a dry contact (no voltage), otherwise it will damage the
external alarm circuitry inside the BDA.
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