OTHER BALANCE SHEET DETAILS

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



	October 31,
	2010		2011
Maintenance spares inventory, net	$	53,654	$	50,442
Deferred debt issuance costs, net	28,853		23,481
Embedded redemption feature	4,220		7,020
Restricted cash	37,796		27,507
Other	5,296		5,673
	$	129,819	$	114,123

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 $2.3 million, $3.8 million and $5.3 million for fiscal 2009, fiscal 2010 and fiscal 2011, respectively.

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



	October 31,
	2010		2011
Warranty	$	54,372	$	47,282
Compensation, payroll related tax and benefits	39,391		51,808
Vacation	20,412		27,808
Current restructuring liabilities	2,784		664
Interest payable	4,345		4,248
Other	72,690		65,194
	$	193,994	$	197,004

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



Year ended	Beginning								Balance at end
October 31,	Balance		Acquired		Provisions		Settlements		of period
2009	$	37,258	$	—	$	19,286	$	16,348	$	40,196
2010	$	40,196	$	24,041	$	15,353	$	25,218	$	54,372
2011	$	54,372	$	—	$	18,451	$	25,541	$	47,282

As a result of the substantial completion of integration activities related to the MEN Business, Ciena consolidated certain support operations and processes during 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,
	2010			2011
Products	$	31,187		$	42,915
Services	73,862			80,883
	105,049			123,798
Less current portion	(75,334		)	(99,373		)
Long-term deferred revenue	$	29,715		$	24,425