Inventories (Tables)

12 Months Ended

Oct. 31, 2011

Inventory Disclosure [Abstract]

Inventories

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

	October 31,
	2010			2011
Raw materials	$	30,569		$	45,333
Work-in-process	6,993			13,851
Finished goods	177,994			134,998
Deferred cost of goods sold	76,830			67,665
	292,386			261,847
Provision for excess and obsolescence	(30,767		)	(31,771		)
	$	261,619		$	230,076

Activity in reserve for excess and obsolete inventory

The following table summarizes the activity in Ciena’s reserve for excess and obsolete inventory for the fiscal years indicated (in thousands):

	Balance at
Year ended	beginning of						Balance at
October 31,	period		Provisions		Disposals		end of period
2009	$	23,257	$	15,719	$	14,974	$	24,002
2010	$	24,002	$	13,696	$	6,931	$	30,767
2011	$	30,767	$	17,334	$	16,330	$	31,771