Exhibit 12-a

ADC Telecommunications
Ratio of Earnings to Fixed Charges
Instructions to Paragraph 503(d) — SEC Handbook

	Fiscal Year Ended October 31
	2006			2005			2004			2003			2002
Earnings
Income (loss) before income taxes	$	56.5		$	104.8		$	33.6		$	(74.1	)	$	(718.0	)
ADD
+ Adjustment for minority interests in consolidated subsidiaries		1.1			0.9			0.3			—			—
+ Income or loss from equity investees		(0.5	)		—			—			—			2.6
+ Fixed Charges		20.1			15.0			14.7			7.2			9.7
+ Distributed income of equity investees		—			—			—			—			—
+ ADC’s share of pre-tax losses of equity investees for which charges arising from guarantees are included in fixed charges		—			—			—			—			—
Sub-total		77.2			120.7			48.6			(66.9	)		(705.7	)
SUBTRACT
- Interest Capitalized		—			—			—			—			—
- Preference security dividend requirements of consolidated subsidiaries		—			—			—			—			—
- Minority interest in pre-tax income of subsidiaries that have not incurred fixed charges		(1.1	)		(0.9	)		(0.3	)		—			—
Sub-total		(1.1	)		(0.9	)		(0.3	)		—			—
Total Earnings	$	76.1		$	119.8		$	48.3		$	(66.9	)	$	(705.7	)
Fixed Charges
Interest Expensed	$	15.8		$	11.2		$	8.8		$	3.6		$	2.4
Interest Capitalized		—			—			—			—			—
Amortized premiums, discounts & capitalized expenses related to indebtedness		1.5			1.5			1.6			0.6			—
Interest Within Rental Expense		2.8			2.3			4.3			3.0			7.3
Preference Security Dividend Requirements		—			—			—			—			—
Total Fixed Charges	$	20.1		$	15.0		$	14.7		$	7.2		$	9.7
Ratio of Earnings to Fixed Charges		3.8			8.0			3.3			(9.3	)		(72.8	)
Deficiency of Earnings to Fixed Charges											74.1			715.4