152 Part G: Alarms © Tait Electronics Limited December 2007
Balanced input
low
The audio level on the base station’s balanced input lines has fallen below the
configured minimum. This alarm can be used to indicate when audio is lost.
Unbalanced input
low
The audio level on the base station’s unbalanced input lines has fallen below the
configured minimum. This alarm can be used to indicate when audio is lost.
External
Reference
The base station can detect whether an external reference is present and
whether it is useable.
External reference
absent
The base station cannot detect an external reference frequency source. It is now
using its own source.
1. There is no external reference source. Most applications do not need one.
2. The source has become unplugged.
3. The source is not working.
An external reference is critical for Quasi-Sync applications.
External reference
invalid
An external reference frequency is connected to the base station, but the base
station cannot lock on to its channel frequency using that reference. It is now
using its own source.
1. The base station is configured (Configure > Base Station > General) to
expect a 10 MHz frequency, but the source is 12.8 MHz (or vice versa).
2. The alarm is spurious. This can occur during power save operation.
3. The reference source is faulty.
RSSI The base station measures the strength of the incoming RF signal and can
determine whether it is stronger or weaker than a pre-defined level.
RSSI high The signal that the base station is receiving is stronger than the configured
maximum.
RSSI low The signal that the base station is receiving is weaker than the configured
minimum.
Air intake
temperature
The base station is normally fitted with a sensor that measures the air
temperature at the PA fan intake and determines whether it is above or below
the configured limits.
Air intake
temperature high
The temperature has exceeded the configured maximum. The PA can sustain
full-powered continuous operation at an air intake temperature of up to 60°C.
Fan operation and PA power foldback are unaffected by this alarm; it is the
heatsink temperature, not the air intake temperature, that turns a base station
fan on or folds back PA power.
This alarm may trigger if the air intake temperature threshold is higher than the
PA fan control threshold temperature. The heatsink heats the temperature
sensor when the fan is not providing a cooling airflow, resulting in an inflated
air intake temperature. To prevent spurious alarms, make sure that the air intake
temperature alarm threshold is 10°C above the fan threshold temperature.
Air intake
temperature low
The temperature is below the configured minimum. The base station is not
designed for operation below the default minimum.
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