OTHER BALANCE SHEET DETAILS

As of the dates indicated, other long-term assets are comprised of the following (in thousands):



	October 31, 2011		July 31, 2012
Maintenance spares inventory, net	$	50,442	$	53,764
Deferred debt issuance costs, net	23,481		19,529
Embedded redemption feature	7,020		3,860
Restricted cash	27,507		28,519
Other	5,673		4,830
	$	114,123	$	110,502

Deferred debt issuance costs are amortized using the straight line method, which approximates the effect of the effective interest rate method, through the maturity of the related debt. Amortization of debt issuance costs, which is included in interest expense, was $4.0 million and $4.0 million during the first nine months of fiscal 2011 and fiscal 2012, respectively.

As of the dates indicated, accrued liabilities are comprised of the following (in thousands):



	October 31, 2011		July 31, 2012
Warranty	$	47,282	$	51,633
Compensation, payroll related tax and benefits	51,808		41,719
Vacation	27,808		30,412
Current restructuring liabilities	664		3,007
Interest payable	4,248		9,916
Other	65,194		63,283
	$	197,004	$	199,970

The following table summarizes the activity in Ciena’s accrued warranty for the fiscal periods indicated (in thousands):



						Balance at
Nine months ended	Beginning					end of
July 31,	Balance		Provisions	Settlements		period
2011	$	54,372	10,538	(19,205	)	$	45,705
2012	$	47,282	23,495	(19,144	)	$	51,633

As a result of the substantial completion of integration activities related to Ciena's acquisition of the optical and carrier Ethernet assets of Nortel's Metro Ethernet Networks Business (the “MEN Business”), Ciena consolidated certain support operations and processes during the first quarter of fiscal 2011, resulting in a reduction in costs to service future warranty obligations. As a result of the lower expected costs, Ciena reduced its warranty liability by $6.9 million, which had the effect of reducing the provisions in the table above.

As of the dates indicated, deferred revenue is comprised of the following (in thousands):



	October 31, 2011			July 31, 2012
Products	$	42,915		$	23,081
Services	80,883			78,646
	123,798			101,727
Less current portion	(99,373		)	(78,319		)
Long-term deferred revenue	$	24,425		$	23,408