Item 4.01 Changes in Registrant's Certifying Accountant.

We are the plan sponsor for the ADC Telecommunications, Inc. Retirement Savings Plan (the "Plan"). On August 31, 2009, as Plan sponsor and consistent with the terms of the Plan, we determined that we would no longer retain Ernst & Young, LLP as the independent registered public accounting firm for the Plan. None of the audit reports by Ernst & Young for the Plan in the past two years contained an adverse opinion or disclaimer of opinion, or was qualified or modified as to uncertainty, audit scope or accounting principles. The decision to no longer retain Ernst & Young to serve as the independent registered public accounting firm for the Plan was reviewed with the Audit Committee of our Board of Directors. During the Plan's two most recently completed fiscal years and through the date of this report on Form 8-K, there were not any disagreements with Ernst & Young on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure.

The decision to no longer retain Ernst & Young as the indepedent registered public accounting firm for the Plan, does not otherwise impact their relationship with us. As such, Ernst & Young continues to serve as our independent registered public accounting firm that, among other items, provides audit services for our financial statements and our internal controls over financial reporting.

On August 31, 2009 we retained Wipfli LLP to serve as the independent registered public accounting firm for the Plan for the fiscal year ending December 31, 2009. Wipfli provided auditing services for fiscal years 2007 and 2008 for the LGC Wireless, Inc. 401(K) Plan. LGC Wireless, Inc. is one of our wholly owned subsidiaries. During the Plan's two most recently completed fiscal years and through the date of this report on Form 8-K, neither we, any of our affiliated companies nor the Plan otherwise engaged Wipfli to consult on any matter.

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