Specifications

5
Managing Alarms and Events
84
Threshold alarms
ThefirsteightalarmtypesinTable 8arethresholdalarmswhichindicatethatathreshold
sensordetectedavoltage,current,temperature,orfanspeedmeasurementthatwasout‐of‐
range.Uptosixdefaultthresholdsarespecifiedforeachthresholdsensor:
• UpperCritical
• UpperMajor
• UpperMinor
•LowerMinor
•LowerMajor
•LowerCritical
Measurements
betweentheLowerMinorandUpperMinorthresholdsrepresentthenormal
operatingrangeofthemeasurement.MeasurementsbetweentheUpperMinorandUpper
MajorthresholdsorbetweentheLowerMinorandLowerMajorthresholdsrepresentminor
alarmconditions.MeasurementsbetweentheUpperMajorandUpperCriticalthresholdsor
betweentheLower
MajorandLowerCriticalthresholdsrepresentmajoralarmconditions.
AndmeasurementsabovetheUpperCriticalthresholdorbelowtheLowerCriticalthreshold
representcriticalalarmconditions.
TheShelfManagerautomaticallyaddsanalarmtotheDATwhenthesensorgeneratesan
asserteventforanalarmconditioninwhichthemeasurementcrossedanUpperthreshold
(goingup)orcrossedaLowerthreshold(goingdown).Thealarmseverityindicateswhich
thresholdwascrossed.
ThealarmisautomaticallyremovedfromtheDATwhenthesensorgeneratesadeassert
eventforwhichthemeasurementcrossedone(ormore)thresholdsgoingtheotherwayand
nolongerrepresentsanalarmcondition.Hyst eresisisusedtopreventrepeatedalarm
additionandremovalwhenmeasurementvariationsoccurclosetooneofthethresholds.
Table 9. Threshold alarm types
Alarm type Description
Voltage alarms Indicate that a power supply voltage threshold was crossed going up (high voltage) or going down (low voltage). Upper
Minor and Lower Minor thresholds are typically within component requirements, and do not indicate an urgent condition.
The Major and Critical events would indicate a power problem, and should be investigated.
Current alarms Indicate that a power supply load current threshold was crossed going up (high current) or going down (low current).
Current sensors are part of the two shelf power entry modules (PEMs). These events indicate that the 48V/60V load
current has exceeded design levels, and the cause should be investigated.
Fan speed alarms Indicate that a fan speed threshold was crossed going up (high speed) or going down (low speed). These events indicate
that the fans are not rotating at the intended speed. In some cases this may be a temporary condition as the fans change
from one target speed to the next. If the condition persists, contact Radisys Technical Support for help.
Temperature alarms Indicate that a temperature threshold was crossed going up (high temp) or going down (low temp). Upper Minor
temperature events are used by the Shelf Manager to control routine system cooling, and do not indicate an urgent
condition.