TB8100 Service Kit User’s Manual Altering Alarm Thresholds 157Altering Alarm ThresholdsThe Thresholds form (Configure > Alarms > Thresholds) lets you alter thethresholds for base station alarms.Some alarm thresholds are fixed; they are built in to the base station and cannotbe changed. Others have default values. You may want to adjust them to betterreflect your system’s operating conditions or monitoring procedures. This canbe 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 isthe applicable unit. To the right, the read-only Current measurement columndisplays the current value of the parameter to help you select a suitablethreshold. When a parameter value goes outside its limit, the base stationtriggers the corresponding alarm.To adjust a threshold, edit its value or click one of the adjacent arrows, and thenclick 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 “AlarmInputs” on page 202.Minimum PApower outputDefines the lower limit for the PA forward power output. When the outputfalls below this limit, the base station triggers the alarm Forward power low andthe Task Manager input Forward power low becomes true.Maximum PAreverse poweroutputDefines the upper limit for the PA’s reverse power. When the reverse powerexceeds this limit, the base station triggers the alarm Reverse power high andthe 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 usethe VSWR alarm instead. The resolution of the reverse power measurement isonly 1 W, so the reverse power alarm would only trigger if there is a seriousantenna fault. VSWR is calculated with better precision and reliably detectsload failure.
