FOOTNOTES TO GAAP TO NON-GAAP RECONCILIATION

(Unaudited)

Our non-GAAP measures are not meant to be considered in isolation or as a substitute for comparable GAAP measures. The non-GAAP financial measures included in the previous table as well as detailed explanations to the adjustments to comparable GAAP measures, are set forth below:

Non-GAAP gross margin

We believe our investors benefit by understanding our non-GAAP gross margin as a way of understanding how product mix, pricing decisions and manufacturing costs influence our business.  Non-GAAP gross margin excludes restructuring costs, amortization of purchased intangible assets, stock-based compensation and amortization of acquisition-related inventory step-up from GAAP gross margin. We believe that these exclusions offer investors additional information that may be useful to view trends in our gross margin performance.

Non-GAAP operating expenses

We believe this measure is important to investors evaluating our non-GAAP spending in relation to revenue. Non-GAAP operating expenses exclude restructuring costs, amortization of purchased intangible assets, stock-based compensation and acquisition costs associated with external and incremental costs resulting directly from merger and acquisition activities such as legal, due diligence, integration costs and acquisition bonus payments from GAAP operating expenses. We believe that these exclusions offer investors supplemental information to facilitate comparison of our operating expenses to our prior results. 

Non-GAAP operating income

We believe our investors benefit by understanding our non-GAAP operating income trends which are driven by revenue, gross margin, and spending. Non-GAAP operating income excludes restructuring costs, amortization of purchased intangible assets, stock-based compensation, amortization of acquisition-related inventory step-up and acquisition costs associated with external and incremental costs resulting directly from merger and acquisition activities such as legal, due diligence, integration costs and acquisition bonus payments. We believe that these exclusions offer an alternative means for our investors to evaluate current operating performance compared to results of other periods. 

Non-GAAP non-operating income, net

We believe this measure helps investors evaluate our non-operating income trends. Non-GAAP non-operating income, net excludes acquisition (gains) losses associated with unusual acquisition related items such as an adjustment to a gain on bargain purchase (resulting from the fair value of identifiable net assets acquired exceeding the consideration transferred), adjustments to the fair value of earn-out liabilities and payments made or received to settle earn-out and holdback disputes. These costs are specific to particular acquisitions and vary significantly in amount and timing. Non-GAAP non-operating income, net also excludes the write-off of debt issuance costs associated with a terminated credit facility as well as foreign currency exchange (gains) losses specifically associated with hedges for two of our acquisitions. We believe that these exclusions provide investors with a supplemental view of our ongoing financial results.

Non-GAAP income tax provision

Non-GAAP items tax effected adjusts the provision for income taxes to reflect the effect of certain non-GAAP items on non-GAAP net income. We believe this information is useful to investors because it provides for consistent treatment of the excluded items in our non-GAAP presentation.

Non-GAAP net income

This measure provides a supplemental view of net income trends which are driven by non-GAAP income before taxes and our non-GAAP tax rate. Non-GAAP net income excludes restructuring costs, amortization of purchased intangible assets, stock-based compensation, amortization of acquisition-related inventory step-up, acquisition costs, a write-off of debt issuance costs associated with a terminated credit facility, foreign currency exchange (gains) losses from hedges associated with two acquisitions, and non-GAAP tax adjustments from GAAP net income. We believe our investors benefit from understanding these exclusions and from an alternative view of our net income performance as compared to our past net income performance.

Non-GAAP diluted net income per share

We believe our investors benefit by understanding our non-GAAP operating performance as reflected in a per share calculation as a way of measuring non-GAAP operating performance by ownership in the company. Non-GAAP diluted net income per share excludes restructuring costs, amortization of purchased intangible assets, stock-based compensation, amortization of acquisition-related inventory step-up, acquisition costs, a write-off of debt issuance costs associated with a terminated credit facility, foreign currency exchange (gains) losses from hedges associated with two acquisitions, and non-GAAP tax adjustments from GAAP diluted net income per share. We believe that these exclusions offer investors a useful view of our diluted net income per share as compared to our past diluted net income per share. 

Non-GAAP operating leverage

We believe this information is beneficial to investors as a measure of how much incremental revenue is contributed to our operating income. Non-GAAP operating leverage is the increase in non-GAAP operating income as a percentage of the increase in revenue. We believe that this information offers investors supplemental information to evaluate our current performance and to compare to our past non-GAAP operating leverage. 

Non-GAAP segment operating income

Non-GAAP segment operating income excludes stock-based compensation from GAAP segment operating income (loss). We believe this information is useful to investors because some may exclude stock-based compensation as an alternative view when assessing trends in the operating income of our segments. 

These non-GAAP measures can be used to evaluate our historical and prospective financial performance, as well as our performance relative to competitors. We believe some of our investors track our "core operating performance" as a means of evaluating our performance in the ordinary, ongoing, and customary course of our operations. Core operating performance excludes items that are non-cash, not expected to recur or not reflective of ongoing financial results.  Management also believes that looking at our core operating performance provides a supplemental way to provide consistency in period to period comparisons.  Accordingly, management excludes from non-GAAP those items relating to restructuring, amortization of purchased intangible assets, stock based compensation, amortization of acquisition-related inventory step-up, acquisition costs, a write-off of debt issuance costs associated with a terminated credit facility, foreign currency exchange (gains) losses from hedges associated with two acquisitions, and non-GAAP tax adjustments.  For detailed explanations of the adjustments made to comparable GAAP measures, see items (A) - ( J ) below,

( A )

Restructuring costs.Included in our GAAP presentation of cost of sales and operating expenses, restructuring costs recorded are primarily for employee compensation resulting from reductions in employee headcount in connection with our company restructurings.  We exclude restructuring costs from our non-GAAP measures because we believe they do not reflect expected future operating expenses, they are not indicative of our core operating performance, and they are not meaningful in comparisons to our past operating performance.  

( B )

Amortization of purchased intangible assets. Included in our GAAP presentation of gross margin, operating expenses, operating income, and net income is amortization of purchased intangible assets. US GAAP accounting requires that intangible assets are recorded at fair value and amortized over their useful lives. Consequently, the timing and size of our acquisitions will cause our operating results to vary from period to period making a comparison to past performance difficult for investors. This accounting treatment may cause differences when comparing our results to companies that grow internally because the fair value assigned to the intangible assets acquired through acquisition may significantly exceed the equivalent expenses that a company may incur for similar efforts when performed internally. Furthermore, the useful life that we expense our intangible assets over may be substantially different from the time period that an internal growth company incurs and recognizes such expenses. We believe that by excluding the amortization of purchased intangible assets, which primarily represents technology and/or customer relationships already developed, it enhances comparability by allowing investors to compare our operations pre-acquisition to those post-acquisitions and to those of our competitors that have pursued internal growth strategies.

( C )

Stock-based compensation. Included in our GAAP presentation of cost of sales and operating expenses, stock-based compensation consists of expenses for employee stock options and awards and purchase rights under our employee stock purchase plan. We exclude stock-based compensation expense from our non-GAAP measures because some investors may view it as not reflective of our core operating performance as it is a non-cash expense.   For the second quarter and the first two quarters of fiscal 2012 and 2011, stock-based compensation was allocated as follows: 

Second Quarter of

First Two Quarters of

(Dollars in thousands)

2012

2011

2012

2011

Cost of sales

$   458

$   502

$     978

$     970

Research and development

1,477

1,126

2,706

2,222

Sales and Marketing

1,837

1,659

3,628

3,293

General and administrative

4,383

3,842

8,632

7,442

$ 8,155

$ 7,129

$ 15,944

$ 13,927

( D )

Amortization of acquisition-related inventory step-up.   The purchase accounting entries associated with our business acquisitions require us to record inventory at its fair value, which is sometimes greater than the previous book value of the inventory.  Included in our GAAP presentation of cost of sales, the increase in inventory value is amortized to cost of sales over the period that the related product is sold.  We exclude inventory step-up amortization from our non-GAAP measures because it is a non-cash expense that we do not believe is indicative of our ongoing operating results.  We further believe that excluding this item from our non-GAAP results is useful to investors in that it allows for period-over-period comparability.

( E )

Acquisition costs.   Included in our GAAP presentation of operating expenses, acquisition costs consist of external and incremental costs resulting directly from merger and acquisition activities such as legal, due diligence, integration costs and acquisition bonus payments.  Included in our GAAP presentation of non-operating income, net, acquisition costs include unusual acquisition related items such as an adjustment to a gain on bargain purchase (resulting from the fair value of identifiable net assets acquired exceeding the consideration transferred), adjustments to the fair value of earn-out liabilities and payments made or received to settle earn-out and holdback disputes. Although we do numerous acquisitions, the costs that have been excluded from the non-GAAP measures are costs specific to particular acquisitions. These are one-time costs that vary significantly in amount and timing and are not indicative of our core operating performance.

( F )

Debt issuance cost write-off.    Included in our non-operating income, net this amount represents a write-off of debt issuance cost for a terminated credit facility.  We excluded the debt issuance cost write-off from our non-GAAP measures. We believe that investors benefit from excluding this item from our non-operating income to facilitate a more meaningful evaluation of our non-operating income trends.

( G )

Foreign currency exchange (gain) loss associated with acquisitions.    This amount represents the (gain) loss on foreign currency exchange hedges associated with two of our acquisitions.  We excluded the foreign currency exchange (gain) loss from our non-GAAP measures because we believe that the exclusion of this item provides investors an enhanced view of the cost structure of our operations and facilitates comparisons with the results of other periods.                     

( H )

Non-GAAP items tax effected.   This amount adjusts the provision for income taxes to reflect the effect of the non-GAAP items (A) - (G) on non-GAAP net income.   We believe this information is useful to investors because it provides for consistent treatment of the excluded items in this non-GAAP presentation. 

( I )

GAAP and non-GAAP tax rate %.   These percentages are defined as GAAP income tax provision as a percentage of GAAP income before taxes and non-GAAP income tax provision as a percentage of non-GAAP income before taxes.   We believe that investors benefit from a presentation of non-GAAP tax rate percentage as a way of facilitating a comparison to non-GAAP tax rates in prior periods.

( J )

Stock-based compensation. The amounts consist of expenses for employee stock options and awards and purchase rights under our employee stock purchase plan. As referred to above we exclude stock-based compensation here because investors may view it as not reflective of our core operating performance as it is a non-cash expense. However, management does include stock-based compensation for budgeting and incentive plans as well as for reviewing internal financial reporting. We discuss our operating results by segment with and without stock-based compensation expense, as we believe it is useful to investors. Stock-based compensation not allocated to the reportable segments was approximately $3.4 million and $2.7 million for the second quarter of fiscal 2012 and 2011, respectively, and $6.4 million and $5.0 million for the first two quarters of fiscal 2012 and 2011, respectively.