<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS FOR ADC TELECOMMUNICATIONS, INC. AND SUBSIDIARIES FOR THE
NINE-MONTH PERIOD ENDED JULY 31, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-START> NOV-01-1998
<PERIOD-END> JUL-31-1999
<CASH> 227,933
<SECURITIES> 144,054
<RECEIVABLES> 401,531<F1>
<ALLOWANCES> 9,182
<INVENTORY> 273,785<F2>
<CURRENT-ASSETS> 1,132,754
<PP&E> 649,799
<DEPRECIATION> 313,739
<TOTAL-ASSETS> 1,855,437
<CURRENT-LIABILITIES> 345,925
<BONDS> 0
0
0
<COMMON> 27,364
<OTHER-SE> 1,463,014
<TOTAL-LIABILITY-AND-EQUITY> 1,855,437
<SALES> 1,517,743
<TOTAL-REVENUES> 1,517,743
<CGS> 811,651
<TOTAL-COSTS> 811,651
<OTHER-EXPENSES> 622,168
<LOSS-PROVISION> 587
<INTEREST-EXPENSE> 6,756
<INCOME-PRETAX> 85,302
<INCOME-TAX> 37,735
<INCOME-CONTINUING> 47,567
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 47,567
<EPS-BASIC> 0.08
<EPS-DILUTED> 0.08
<FN>
<F1>AMOUNT IS NET OF ALLOWANCE FOR BAD DEBTS AND RETURNS.
<F2>AMOUNT IS NET OF OBSOLESCENCE RESERVES.
</FN>
</TABLE>