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3.18.3.3. Round-Trip Delay
CPRI v7.0 Specification requirements R-20 and R-21 address the round-trip delay. Requirement R-20 addresses the measurement without including the cable delay, and requirement R-21 is the requirement for the cable delay. Both requirements state that the variation must be no more than ±16.276 ns.
To monitor the round-trip delay, you must check periodically to confirm that the variation in measurements over time is small enough that the requirements are met.