Accounts Receivable

12 Months Ended

Oct. 31, 2020

As of October 31, 2020, no customer accounted for 10.0% of net accounts receivable. As of November 2, 2019, one customer accounted for 12.0% of net accounts receivable. Ciena has not historically experienced a significant amount of bad debt expense. The reduction in Ciena’s allowance for doubtful accounts as of October 31, 2020 compared to November 2, 2019 is primarily due to the final settlement from a significant asset impairment of $12.2 million for a trade receivable related to a single customer in the APAC region recorded in fiscal 2017. The following table summarizes the activity in Ciena’s allowance for doubtful accounts for the fiscal years indicated (in thousands):


Year Ended	Beginning Balance		Provisions		Net Deductions		Ending Balance
November 3, 2018	$	17,580	$	2,700	$	2,902	$	17,378
November 2, 2019	$	17,378	$	6,740	$	4,017	$	20,101
October 31, 2020	$	20,101	$	8,855	$	18,358	$	10,598