TB8100 Service Kit User’s Manual Altering Alarm Thresholds 157
Altering Alarm Thresholds
The Thresholds form (Configure > Alarms > Thresholds) lets you alter the
thresholds for base station alarms.
Some alarm thresholds are fixed; they are built in to the base station and cannot
be changed. Others have default values. You may want to adjust them to better
reflect your system’s operating conditions or monitoring procedures. This can
be important if an alarm is used as an input in Task Manager tasks.
The form displays a list of upper and lower limits. Alongside each threshold is
the applicable unit. To the right, the read-only Current measurement column
displays the current value of the parameter to help you select a suitable
threshold. When a parameter value goes outside its limit, the base station
triggers the corresponding alarm.
To adjust a threshold, edit its value or click one of the adjacent arrows, and then
click OK to confirm your changes and close the form.
The alarms that these thresholds apply to are described in “Monitoring Alarms”
on page 147. The equivalent Task Manager inputs are described in “Alarm
Inputs” on page 202.
Minimum PA
power output
Defines the lower limit for the PA forward power output. When the output
falls below this limit, the base station triggers the alarm Forward power low and
the Task Manager input Forward power low becomes true.
Maximum PA
reverse power
output
Defines the upper limit for the PA’s reverse power. When the reverse power
exceeds this limit, the base station triggers the alarm Reverse power high and
the Task Manager input Reverse power high becomes true.
When using a 5 W PA, or any PA set to 20 W or less, disable this alarm and use
the VSWR alarm instead. The resolution of the reverse power measurement is
only 1 W, so the reverse power alarm would only trigger if there is a serious
antenna fault. VSWR is calculated with better precision and reliably detects
load failure.
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