Different equations for Bandwidth delay product from different writers

Question

"Computer Networks" By A. Tannenbaum says that Bandwidth delay product is determined by the bandwidth in bits/sec multiplied by the one-way transit time, and then multiplied the bandwidth of 50kbps with half of 500msec round trip propagation delay ($50kbps \times 250msec$), Whereas I'm finding that the Formula for Bandwidth delay product is $Bandwidth \times RTT$RTT. Which one is correct?

Answer 1

Bandwidth Delay Product:
The bandwidth-delay product is a measure of the number of bits we can send out of our system while waiting for news from the receiver.The bandwidth-delay product then is the volume of the pipe in bits. 

                                                     B.D.P = BWW*Round Trip Delay

Source: Forozuan

Comments

Thank you. Tannenbaum's "Computer Networks" is perhaps not the good book for this subject I think. or it may be a typing mistake on his side.

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I am not sure about it! But I have all three books, Forozaun, Kruose and TaTannenbaum and i never liked TaTannenbaum I read from other two only.