PROSPECTUS ADC TELECOMMUNICATIONS, INC. GLOBAL STOCK INCENTIVE PLAN

Exhibit 10-a

PROSPECTUS

ADC TELECOMMUNICATIONS, INC.

GLOBAL STOCK INCENTIVE PLAN

21,329,775 shares of Common Stock
($.20 par value)

The date of this prospectus is January 10, 2007.

TABLE OF CONTENTS

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents that we have filed with the U.S. Securities and Exchange Commission (the "Commission") are incorporated by reference in this prospectus:

     All documents filed by us under Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act after the date of this prospectus and prior to the filing of a post-effective amendment with the Commission which indicates that all securities offered by this prospectus have been sold, or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference in this prospectus and to be a part of this prospectus from the respective dates of filing of such documents.

     We will provide you, without charge, upon your written or oral request, a copy of any or all of the following:

     Requests for copies of these documents should be directed to Jeffrey D. Pflaum, Corporate Secretary, ADC Telecommunications, Inc., 13625 Technology Drive, Eden Prairie, Minnesota 55344 (telephone number (952) 938-8080).

1

NATURE OF INVESTMENT

     An investment in our Common Stock involves risk. We encourage you to review our Annual Report on Form 10-K for the fiscal year ended October 31, 2006, as filed with the Commission. This report sets forth the significant risk factors involved in an investment in our Common Stock in Item 1A of such report under the captions "Risks Related to Our Business" and "Risks Related to Our Common Stock."

INFORMATION ABOUT THE PLAN

General

     The information in this prospectus relates to the ADC Telecommunications, Inc. Global Stock Incentive Plan, which we call the "Plan" in this prospectus. The Plan was initially adopted by our Board of Directors in November 1990 and was approved by our shareholders on February 26, 1991. The Plan became effective immediately upon shareholder approval. The Board adopted amendments to the Plan in November 1992, December 1994, November 1996, December 1998, December 1999, December 2000, December 2001 and December 2002, and our shareholders approved these amendments on February 23, 1993, February 28, 1995, February 25, 1997, February 23, 1999, February 22, 2000, February 27, 2001, February 19, 2002, March 4, 2003 and March 2, 2004, respectively. In December 1996, the Board adopted an amendment to the Plan that did not require shareholder approval. The Plan was amended and restated through August 1, 2005 to reflect the 1-for-7 reverse stock split undertaken by the Company effective May 10, 2005, and was amended and restated through December 12, 2006 to reflect a change in the calculation of "Fair Market Value" under the Plan. Under the current terms of the Plan, the Plan will expire on March 2, 2009.

     The Plan is intended to help us recruit, retain and develop key employees capable of assuring the future success of ADC, to attract and retain the services of experienced and knowledgeable outside directors, and to offer these employees incentives to put forth maximum efforts for the success of our business and to provide these employees and outside directors an opportunity to acquire a proprietary interest in ADC. All key employees of ADC and of our subsidiaries and affiliates in which we have a significant equity interest and all nonemployee directors of ADC are eligible to receive awards under the Plan.

     A total of 21,329,775 shares of our Common Stock, par value $.20 per share, are available as of November 1, 2001 for the issuance of shares under outstanding awards and for the granting of awards under the Plan. The types of awards that may be granted under the Plan are described below. Awards granted under the Plan may be granted only during a period commencing February 26, 1991 and ending on March 2, 2009. However, unless otherwise expressly provided in the Plan or in an applicable award agreement, any award granted may extend beyond March 2, 2009.

     The Plan is not subject to any provisions of the Employee Retirement Income Security Act of 1974 and is not qualified under Section 401(a) of the U. S. Internal Revenue Code of 1986, as amended.

     You may obtain additional information about the Plan and its administrators by writing to Jeffrey D. Pflaum, Corporate Secretary, ADC Telecommunications, Inc., 13625 Technology Drive, Eden Prairie, Minnesota 55344, or by calling (952) 938-8080.

2

Administration

     The Plan is administered by a committee of the Board consisting of three or more nonemployee directors. The members of the committee are appointed by the Board. The committee has the authority to establish rules for the administration of the Plan; to select the key employees to whom awards are granted; to determine the types of awards to be granted and the number of shares of Common Stock covered by the awards; and to set the terms and conditions of the awards. The committee may also determine whether the payment of any amounts received under any award shall or may be deferred and may authorize payments representing dividends in connection with any deferred award of shares of Common Stock. Determinations and interpretations under the Plan are made in the sole discretion of the committee, and are binding on all interested parties. The committee may correct any defect, supply any omission or reconcile any inconsistency in the Plan or any award in the manner and to the extent it deems desirable to carry the Plan into effect. The committee may delegate to one or more officers the right to grant awards to employees who are not subject to Section 16(b) of the Exchange Act.

     Awards under the Plan are granted for no cash consideration or for such minimal cash consideration as may be required by applicable law. Awards may provide that upon their grant or exercise, the holder will receive shares of Common Stock, cash or any combination thereof, as the committee determines. No employee may be granted any award or awards under the Plan, the value of which award or awards is based solely on an increase in the value of the Common Stock after the date of grant of the award or awards, for more than 571,428 shares of Common Stock, in the aggregate, in any one calendar year.

Types of Awards

     The Plan permits the granting of:

     Under the Plan, the number of shares of Common Stock that may be issued pursuant to restricted stock, restricted stock units and performance awards granted after March 2, 2004 is limited to 4,285,714.

      Options . The exercise price per share under any stock option will not be less than 100% of (i) the average of the high and low daily trading prices (rounded down to the nearest whole cent) of a share as reported on the Nasdaq National Market System, if the shares are then quoted on the Nasdaq National Market System or (ii) the average of the high and low daily trading prices (rounded down to the nearest whole cent) of a share on a national securities exchange, if the shares are then being traded on a national securities

3

exchange on the date of grant of the option. Options will be exercisable by payment in full of the exercise price, either in cash or, at the discretion of the committee, in whole or in part by the tendering of shares of our Common Stock or other consideration having a fair market value on the date the option is exercised equal to the option exercise price. Determinations of fair market value under the Plan will be made in accordance with methods and procedures established by the committee. For purposes of the Plan, the fair market value of shares of our Common Stock on a given date will be (a) the last sale price of the shares as reported on the Nasdaq Stock Market on that date, if the shares are then being quoted on the Nasdaq Stock Market, or (b) the closing price of the shares on that date on a national securities exchange, if the shares are then being traded on a national securities exchange.

      SARs . The grant price of any SAR will not be less than 100% of the exercise price per share under any stock option (determined as described in the preceding paragraph) on the date of grant of the SAR. The holder of a SAR will be entitled to receive the excess of the fair market value of a specified number of shares of our Common Stock (calculated as of the exercise date of the SAR or, if the committee so determines, as of any time during a specified period before or after the exercise date) over the grant price of the SAR.

      Restricted Stock and Restricted Stock Units . Restricted stock and restricted stock units are subject to restrictions imposed by the committee during a restriction period determined by the committee. Restricted stock and restricted stock units may not be transferred by the holder until these restrictions established by the committee lapse. If the holder’s employment terminates during the restriction period, all restricted stock and restricted stock units will be forfeited unless the committee determines otherwise.

     The holder of restricted stock may have all of the rights of our shareholders, including the right to vote the shares subject to the restricted stock award and to receive any dividends with respect thereto, or these rights may be limited.

     Holders of restricted stock units shall have the right, subject to any restrictions imposed by the committee, to receive shares of Common Stock at some future date. After the lapse or waiver of any applicable restrictions, holders of restricted stock units will be issued such shares.

      Performance Awards . Holders of performance awards have the right to receive shares of our Common Stock upon the achievement of specified performance goals during performance periods established by the committee. A performance award granted under the Plan may be payable in shares of Common Stock or restricted stock.

      Dividend Equivalents . Dividend equivalents will entitle the holders thereof to receive payments (in cash or shares, as determined by the committee) equivalent to the amount of cash dividends with respect to a specified number of shares.

Transferability of Awards

     You may not assign, transfer, pledge or otherwise encumber any award granted under the Plan, except for transfers by will, by designation of a beneficiary or by the laws of descent and distribution. You may, however, transfer all or a portion of a nonqualified stock option to specified members of your immediate family or to certain family trusts, partnerships or other entities in accordance with the terms of the Plan.

4

Exercise of Awards

     Each award is exercisable only by you, by a permitted transferee or, if permissible under applicable law, by your guardian or legal representative.

Share Accounting

     If any shares of our Common Stock subject to an award or to which an award relates are not purchased or are forfeited, or if any award terminates without the delivery of shares or other consideration, the shares previously used for these awards will be available for future awards under the Plan. Except as otherwise provided under procedures adopted by the committee to avoid double-counting with respect to awards granted in tandem with or in substitution for other awards, all shares relating to awards granted will be counted against the aggregate number of shares available for granting awards under the Plan. Shares that are used by a participant as full or partial payment to ADC of the purchase price of shares acquired upon exercise of a stock option or to satisfy applicable tax withholding requirements upon the exercise or vesting of an award will be available for future awards under the Plan.

Adjustments

     Under the Plan, appropriate adjustments will be made to the Plan and to the number of outstanding options in the event of changes in our Common Stock through merger, consolidation, reorganization, recapitalization, stock dividend, stock split or other change in corporate structure.

Amendments or Termination of the Plan

     The Board may amend, alter or discontinue the Plan at any time, but may not, without shareholder approval, make any revisions or amendments to the Plan that (a)&nbs