DelayBandwidthProduct - Dr. A's Wiki

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Delay refers to the RTT (round trip time), and bandwidth is measured in bits/s. Therefore the delay $\times$ bandwidth product is the amount of data (bits) in the pipe or unacknowledged in one round trip time. Given $x$ bits for the advertised window $2^{x} \geq D e l a y X B a n d w i t h$ means that you can continuously send data if acks arrive in $R T T / 2$ time as expected.

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