OTHER BALANCE SHEET DETAILS

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



	October 31, 2014		July 31, 2015
Maintenance spares, net	$	54,101	$	58,959
Deferred debt issuance costs, net	15,160		11,889
Other	4,815		7,499
	$	74,076	$	78,347

Deferred debt issuance costs relate to Ciena's convertible notes payable (described in Note 15 below), Term Loan (described in Note 15 below) and our ABL Credit Facility (described in Note 16 below). 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. The amortization of deferred debt issuance costs is included in interest expense, and was $3.6 million and $3.6 million during the first nine months of fiscal 2014 and fiscal 2015, respectively.

As of the dates indicated, accrued liabilities and other short-term obligations are comprised of the following (in thousands):



	October 31, 2014		July 31, 2015
Compensation, payroll related tax and benefits	82,207		79,794
Warranty	55,997		53,834
Vacation	35,126		31,990
Capital lease obligations	7,788		6,319
Interest payable	6,409		5,817
Other	89,081		94,937
	$	276,608	$	272,691

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



Nine months ended	Beginning					Ending
July 31,	Balance		Provisions	Settlements		Balance
2014	$	56,303	18,720	(17,581	)	$	57,442
2015	$	55,997	12,549	(14,712	)	$	53,834

The decrease in the first nine months of fiscal 2015 warranty provision compared to the first nine months of fiscal 2014 was due to lower failure rates and reduced component and labor repair costs.

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



	October 31, 2014			July 31, 2015
Products	$	50,457		$	56,355
Services	95,161			112,278
	145,618			168,633
Less current portion	(104,688		)	(114,902		)
Long-term deferred revenue	$	40,930		$	53,731

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



	October 31, 2014		July 31, 2015
Income tax liability	$	14,342	$	13,810
Deferred tenant allowance	10,839		10,057
Straight-line rent	5,174		5,801
Capital lease obligations	4,589		13,977
Construction liability	—		8,770
Forward starting interest rate swap	2,083		4,968
Other	8,363		6,099
	$	45,390	$	63,482

Ciena capitalizes construction in progress and records a corresponding long-term liability for build-to-suit lease agreements where Ciena is considered the owner during the construction period for accounting purposes.

The following is a schedule by fiscal years of future minimum lease payments under capital leases and the present value of minimum lease payments as of July 31, 2015 (in thousands):



Period ended October 31,
2015 (remaining three months)	$	1,934
2016	6,055
2017	1,628
2018	1,290
2019	1,290
Thereafter	19,808
Net minimum capital lease payments	32,005
Less: Amount representing interest	(11,709		)
Present value of minimum lease payments	20,296
Less: Current portion of present value of minimum lease payments	(6,319		)
Long-term portion of present value of minimum lease payments	$	13,977