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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 $$2^x \geq Delay~X~Bandwith$$ means that you can continuously send data if acks arrive in $$RTT/2$$ time as expected.
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