<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, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-START> NOV-01-1999
<PERIOD-END> JUL-31-2000
<CASH> 176,865
<SECURITIES> 1,454,635
<RECEIVABLES> 660,106<F1>
<ALLOWANCES> 12,150
<INVENTORY> 422,238<F2>
<CURRENT-ASSETS> 2,904,131
<PP&E> 885,701
<DEPRECIATION> 389,275
<TOTAL-ASSETS> 4,001,300
<CURRENT-LIABILITIES> 1,125,643
<BONDS> 0
0
0
<COMMON> 142,050
<OTHER-SE> 2,714,822
<TOTAL-LIABILITY-AND-EQUITY> 4,001,300
<SALES> 2,255,516
<TOTAL-REVENUES> 2,225,516
<CGS> 1,163,319
<TOTAL-COSTS> 1,163,319
<OTHER-EXPENSES> 826,679
<LOSS-PROVISION> 1,965
<INTEREST-EXPENSE> 3,402
<INCOME-PRETAX> 1,323,355
<INCOME-TAX> 523,479
<INCOME-CONTINUING> 799,876
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 799,876
<EPS-BASIC> 1.14
<EPS-DILUTED> 1.08
<FN>
<F1>AMOUNT IS NET OF ALLOWANCE FOR BAD DEBTS AND RETURNS.
<F2>AMOUNT IS NET OF OBSOLESCENCE RESERVES.
</FN>
</TABLE>