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  <xs:element id="calx_PaymentsForFinancingArrangements" abstract="false" name="PaymentsForFinancingArrangements" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAwardWeightingPercentForTargetAchievementPerformanceThresholdPercent" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAwardWeightingPercentForTargetAchievementPerformanceThresholdPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="calx_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotyetRecognizedToBeRecognizedInYearTwo" abstract="false" name="EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotyetRecognizedToBeRecognizedInYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="calx_MinimumExercisePriceOfStockOptionPercent" abstract="false" name="MinimumExercisePriceOfStockOptionPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="calx_ScheduleOfChangesInAllowanceForDoubtfulAccountsAndProductReturnLiabilityTableTextBlock" abstract="false" name="ScheduleOfChangesInAllowanceForDoubtfulAccountsAndProductReturnLiabilityTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedPerPurchasePeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedPerPurchasePeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="calx_EffectiveIncomeTaxRateReconciliationExpirationOfOperatingIncomeLoss" abstract="false" name="EffectiveIncomeTaxRateReconciliationExpirationOfOperatingIncomeLoss" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="calx_A2021PerformanceTargetsMember" abstract="true" name="A2021PerformanceTargetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeTerminationPeriodFollowingPurchaseDateToReceiveSharesSubjectToRiskOfForfeiture" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeTerminationPeriodFollowingPurchaseDateToReceiveSharesSubjectToRiskOfForfeiture" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesGrantedIfTargetAchievementPerformanceThresholdNotMet" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesGrantedIfTargetAchievementPerformanceThresholdNotMet" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="calx_LumenTechnologiesIncMember" abstract="true" name="LumenTechnologiesIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes" abstract="false" name="TaxesPayableCurrentExcludingAccruedIncomeTaxes" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="calx_IncomeTaxesTable" abstract="true" name="IncomeTaxesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
</xs:schema>
