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Revenue
 3 Months Ended
Dec. 31, 2021
Revenue [Abstract]  
Revenue REVENUE
Disaggregation of Revenue
We disaggregate revenue from contracts with customers by markets and geography, as we believe it best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors.
The following tables present our revenue disaggregated by markets and geography (in thousands):
Three Months Ended
December 31, 2021January 1, 2021
Revenue by Market:
Telecommunications
$55,822 $51,532 
Industrial & Defense
73,146 61,618 
Data Center
30,652 35,354 
Total $159,620 $148,504 

Three Months Ended
December 31, 2021January 1, 2021
Revenue by Geographic Region:
United States
$74,426 $63,982 
China
36,063 42,376 
Asia Pacific, excluding China (1)
30,650 21,773 
Other Countries (2)
18,481 20,373 
Total$159,620 $148,504 
(1)Asia Pacific primarily represents Taiwan, Japan, Singapore, Thailand, South Korea, Australia and Malaysia.
(2)No country or region represented greater than 10% of our total revenue as of the dates presented, other than the United States, China and Asia Pacific region as presented above.
Contract Balances
We record contract assets or contract liabilities depending on the timing of revenue recognition, billings and cash collections on a contract-by-contract basis. Our contract liabilities primarily relate to deferred revenue, including advanced consideration received from customers for contracts prior to the transfer of control to the customer, and therefore revenue is subsequently recognized upon delivery of products and services.
The following table presents the changes in contract liabilities during the three months ended December 31, 2021 (in thousands, except percentage):
December 31, 2021October 1, 2021$ Change% Change
 Contract liabilities$2,991 $2,793 $198 7 %
As of December 31, 2021 and October 1, 2021, $0.7 million and $0.9 million, respectively, of our contract liabilities, were recorded as other long-term liabilities on our balance sheet with the remainder recorded as accrued liabilities. During the three months ended December 31, 2021, we recognized net sales of $0.4 million that were included in the contract liabilities balance
as of the beginning of the period. The increase in contract liabilities during the three months ended December 31, 2021, as shown in the table above, was primarily related to deferral of revenue for invoiced products and services prior to when certain of our customers obtained control of the product and or services