Specifications

Specifications

Mean time between failures (MTBF)

TheboardMTBFisdesignedtomeetorexceed150,000hours@+35CperTelcordia SR332

Issue2,Method1,Case3.ThecalculationresultsinTable 25weregeneratedusingthe

referencesandassumptionslisted.Thisspecificationanditsassociatedcalculationssupersede

allotherreleasedmeantimebetweenfailures(MTBF),annualfailurerate(AFR),earlyreturn

index(ERI),anddead‐on‐arrival(DOA)calculationswithearlierdates.Thereportedfailure

ratesdonotrepresentcatastrophicfailure.

Environmental assumptions

•Failureratesarebasedona55°Cambienttemperature.

• Appliedcomponentstresslevelsare50%(voltage,current,and/orpower).

• Ground,fixed,controlledenvironmentwithanenvironmentaladjustmentfactorequalto

1.0.

General assumptions

•CalculationType:MTBF/FITrate

• Standard:TelcordiaStandardSR‐332Issue2

• Methods:MethodI,CaseIII,QualityLevelII

• Componentfailureratesareconstant.

•Board‐to‐systeminterconnectsareincludedwithinestimates.

•Non‐electricalcomponents(screws,mechanicallatches,labels,covers,etc.)arenot

includedinestimates.

General notes

•MethodI,CaseI=Basedonpartscount.Equipmentfailureisestimatedbytotalingdevice

failuresratesandquantitiesused.

• QualityLevelII=Devicespurchasedtospecifications,qualifieddevices,vendorlot‐to‐lot

controlsforQLsandDPMs.

Whereavailable,directcomponentsupplierpredictionsorrateshavebeenused.

Table 25. Reliability estimate data

Product MTBF AFR ERI DOA

ATCA-4616 220,000 4.0% 19,992 PPM 3,320 PPM

ATCA-4618 218,000 4.0% 20,105 PPM 3,351 PPM

ATCA-4648 218,000 4.0% 20,105 PPM 3,351 PPM

Note: Calculations based on the CPM only; does not include DIMMs, on-board modules, or RTM.

MTBF - predicted/modeled mean time before failure rate

AFR - predicted/modeled annual failure rate at 35°C assuming 100% duty cycle

ERI - expected Early Return Index defined as failures in the first 6 months

DOA - expected Dead on Arrival rate defined as failures in first 30 days