<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 SIX-MONTH PERIOD ENDED APRIL 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-START> NOV-01-1999
<PERIOD-END> APR-30-2000
<CASH> 233,016
<SECURITIES> 549,267
<RECEIVABLES> 530,149<F1>
<ALLOWANCES> 9,677
<INVENTORY> 315,459<F2>
<CURRENT-ASSETS> 1,689,943
<PP&E> 710,990
<DEPRECIATION> 326,857
<TOTAL-ASSETS> 2,425,671
<CURRENT-LIABILITIES> 633,522
<BONDS> 0
0
0
<COMMON> 61,653
<OTHER-SE> 1,708,942
<TOTAL-LIABILITY-AND-EQUITY> 2,425,671
<SALES> 1,253,792
<TOTAL-REVENUES> 1,253,792
<CGS> 639,712
<TOTAL-COSTS> 639,712
<OTHER-EXPENSES> 388,605
<LOSS-PROVISION> 2,171
<INTEREST-EXPENSE> 1,333
<INCOME-PRETAX> 227,257
<INCOME-TAX> 77,267
<INCOME-CONTINUING> 149,990
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 149,990
<EPS-BASIC> 0.49
<EPS-DILUTED> 0.47
<FN>
<F1>AMOUNT IS NET OF ALLOWANCE FOR BAD DEBT AND RETURNS
<F2>AMOUNT IS NET OF OBSOLESCENCE RESERVES
</FN>
</TABLE>