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ACCOUNTS RECEIVABLE | 12 Months Ended
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Oct. 30, 2021
Receivables [Abstract] |
ACCOUNTS RECEIVABLE | ACCOUNTS RECEIVABLE As of October 30, 2021, two customers accounted for 15.0% and 10.0% of net accounts receivable, respectively. As of October 31, 2020, no customer accounted for 10.0% of net accounts receivable. Ciena has not historically experienced a significant amount of bad debt expense. The following table summarizes the activity in Ciena’s allowance for credit losses for the fiscal years indicated (in thousands):
Year Ended |  | Beginning Balance |  | Effect of adoption of new accounting standard (Note 1) |  | Provisions |  | Net Deductions |  | Ending Balance
November 2, 2019 |  | $ | 17,378 |  |  | $ | — |  |  | $ | 6,740 |  |  | $ | 4,017 |  |  | $ | 20,101 |
October 31, 2020 (1) |  | $ | 20,101 |  |  | $ | — |  |  | $ | 8,855 |  |  | $ | 18,358 |  |  | $ | 10,598 |
October 30, 2021 |  | $ | 10,598 |  |  | $ | 2,206 |  |  | $ | 2,346 |  |  | $ | 4,238 |  |  | $ | 10,912 |
(1)The reduction in Ciena’s allowance for credit losses 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.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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