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  <element id="nvtl_SummaryOfCommonSharesReservedForFutureIssuanceTableTextBlock" name="SummaryOfCommonSharesReservedForFutureIssuanceTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_IncomeTaxEffectsAllocatedDirectlyToEquityTableTextBlock" name="IncomeTaxEffectsAllocatedDirectlyToEquityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_BusinessAcquisitionContingentConsiderationPotentialCashPaymentMaximum" name="BusinessAcquisitionContingentConsiderationPotentialCashPaymentMaximum" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="nvtl_ForeignCurrencyExchangeForwardContractsOutstanding" name="ForeignCurrencyExchangeForwardContractsOutstanding" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="nvtl_EuroDenominatedForeignCurrencyExchangeForwardContractsGainLoss" name="EuroDenominatedForeignCurrencyExchangeForwardContractsGainLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="nvtl_FutureGrantsOfAwardMember" name="FutureGrantsOfAwardMember" abstract="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_EmployeeStockPurchasePlansMember" name="EmployeeStockPurchasePlansMember" abstract="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" abstract="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards" name="DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="nvtl_DeferredTaxAssetsUnrecognizedTaxBenefits" name="DeferredTaxAssetsUnrecognizedTaxBenefits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="nvtl_DeferredTaxAssetsAndLiabilitiesGross" name="DeferredTaxAssetsAndLiabilitiesGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="nvtl_IncomeTaxReconciliationChangeInValuationAllowanceCurrentYear" name="IncomeTaxReconciliationChangeInValuationAllowanceCurrentYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="nvtl_IncomeTaxReconciliationChangeInValuationAllowancePriorYearDeferred" name="IncomeTaxReconciliationChangeInValuationAllowancePriorYearDeferred" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="nvtl_EffectiveIncomeTaxRateReconciliationUncertainTaxPositions" name="EffectiveIncomeTaxRateReconciliationUncertainTaxPositions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="nvtl_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentAndPriorPeriodTaxPositions" name="UnrecognizedTaxBenefitsIncreasesResultingFromCurrentAndPriorPeriodTaxPositions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="nvtl_EnforaMember" name="EnforaMember" abstract="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_EntityWideReceivablesMajorCustomerPercentage" name="EntityWideReceivablesMajorCustomerPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_DefinedContributionPlanEmployersMatchingContributionVestingPeriod" name="DefinedContributionPlanEmployersMatchingContributionVestingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_ImpairmentsAnalyses" name="ImpairmentsAnalyses" type="xbrli:dateItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_PaymentOfShareBasedCompensationAwardsAbstract" name="PaymentOfShareBasedCompensationAwardsAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_NewHireMember" name="NewHireMember" abstract="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_ExistingEmployeeMember" name="ExistingEmployeeMember" abstract="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_IncomeTaxReconciliationNondeductibleExpenseMergerFees" name="IncomeTaxReconciliationNondeductibleExpenseMergerFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="nvtl_IncomeTaxReconciliationBusinessCombination" name="IncomeTaxReconciliationBusinessCombination" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="nvtl_BusinessAcquisitionContingentConsiderationAtEstimatedFairValue" name="BusinessAcquisitionContingentConsiderationAtEstimatedFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="nvtl_PeriodOfOperatingResultsConsideredForContingentConsideration" name="PeriodOfOperatingResultsConsideredForContingentConsideration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_LongTermInvestmentMaturityPeriod" name="LongTermInvestmentMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_PropertyPlantAndEquipmentByTypeTableTextBlock" name="PropertyPlantAndEquipmentByTypeTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_UncertainTaxPositionRecognitionThreshold" name="UncertainTaxPositionRecognitionThreshold" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_SignificantRevenueFromMultipleElementOrSoftwareArrangements" name="SignificantRevenueFromMultipleElementOrSoftwareArrangements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="nvtl_GoodwillImpairmentRecognitionCriteriaPercentageThreshold" name="GoodwillImpairmentRecognitionCriteriaPercentageThreshold" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_ForeignCurrencyTranslationGainsLossesFromAttemptedAcquisition" name="ForeignCurrencyTranslationGainsLossesFromAttemptedAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="nvtl_UnrecognizedTaxBenefitLiabilityReleased" name="UnrecognizedTaxBenefitLiabilityReleased" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="nvtl_CapitalLeasedAssetsNetBookValue" name="CapitalLeasedAssetsNetBookValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="nvtl_PurchasedIntangibleAssetAmortizationExpenseClassificationTableTextBlock" name="PurchasedIntangibleAssetAmortizationExpenseClassificationTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_IntangibleAssetDeductionInImpairmentCharge" name="IntangibleAssetDeductionInImpairmentCharge" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="nvtl_NatureOfBusinessAndSignificantAccountingPoliciesTable" name="NatureOfBusinessAndSignificantAccountingPoliciesTable" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_MaturityPeriodOfHighlyLiquidInvestmentsMaximum" name="MaturityPeriodOfHighlyLiquidInvestmentsMaximum" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_MarketableSecuritiesHighlyLiquidDebtInvestmentsMaturityPeriod" name="MarketableSecuritiesHighlyLiquidDebtInvestmentsMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_ProductWarrantyPeriod" name="ProductWarrantyPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_GoodwillMember" name="GoodwillMember" abstract="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_NatureOfBusinessAndSignificantAccountingPoliciesLineItems" name="NatureOfBusinessAndSignificantAccountingPoliciesLineItems" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_CustomerThreeMember" name="CustomerThreeMember" abstract="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_StockOptionsMaximumSharesAvailableForGrant" name="StockOptionsMaximumSharesAvailableForGrant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_StockOptionsTerm" name="StockOptionsTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_StockOptionsYearOneVestingRate" name="StockOptionsYearOneVestingRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="nvtl_ValuationAllowanceDeferredTaxAssetPriorToTwoThousandAndTen" name="ValuationAllowanceDeferredTaxAssetPriorToTwoThousandAndTen" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="nvtl_ResearchAndDevelopmentTaxCredits" name="ResearchAndDevelopmentTaxCredits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="nvtl_NonCashIncomeTaxExpenseBenefit" name="NonCashIncomeTaxExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
</schema>
