Concentration of Credit Risk

3 Months Ended

Oct. 26, 2013

The Company’s customer base is highly concentrated, with its top five customers in each of the three months ended October 26, 2013 and October 27, 2012, accounting for approximately 57.2% and 59.6% of its total revenues, respectively. Revenues from four of the top five customers exceeded 10% of total revenue during the three months ended October 26, 2013 or October 27, 2012:



	For the Three Months Ended
	October 26, 2013	October 27, 2012
AT&T Inc. ("AT&T")	17.5%	13.5%
CenturyLink, Inc. ("CenturyLink")	15.5%	13.7%
Comcast Corporation ("Comcast")	10.5%	12.7%
Verizon Communications, Inc. ("Verizon")	8.4%	10.2%

The Company believes that none of its significant customers was experiencing financial difficulties that would materially impact the collectability of the Company’s trade accounts receivable and costs in excess of billings as of October 26, 2013. Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings as of October 26, 2013 or July 27, 2013 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:



	October 26, 2013				July 27, 2013
	Amount		% of Total		Amount		% of Total
			(Dollars in millions)
AT&T	$	69.0	13.1	%	$	57.4	12.6	%
CenturyLink	$	66.5	12.6	%	$	62.6	13.7	%
Verizon	$	54.8	10.4	%	$	33.4	7.3	%
Windstream Corporation	$	51.4	9.8	%	$	59.4	13.0	%

- Definition

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

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