What is the recommended calibration cycle for ONT products?

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What is the recommended calibration cycle for ONT products?
All ONT modules and mainframes have a recommended 24-month calibration interval. There is also a VIAVI product calibration cycle document available on the VIAVI web site that can be accessed by going to the following link and searching on "calibration cycles". https://www.viavisolutions.com/en-us/resources/literature-library