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Define RTT
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Explicitly state that Round trip time is abbreviated as RTT
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ianswett committed Jan 23, 2019
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# Computing the RTT estimate

RTT is calculated when an ACK frame arrives by computing the difference between
the current time and the time the largest acked packet was sent. An RTT sample
MUST NOT be taken for a packet that is not newly acknowledged or not
ack-eliciting.
Round trip time, abbreviated RTT, is calculated when an ACK frame arrives by
computing the difference between the current time and the time the largest
acked packet was sent. An RTT sample MUST NOT be taken for a packet that
is not newly acknowledged or not ack-eliciting.

When RTT is calculated, the ack delay field from the ACK frame SHOULD be limited
to the max_ack_delay specified by the peer. Limiting ack_delay to max_ack_delay
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