Subject: Query abt complex formula in draft-ietf-pilc-link-design-04.txt

From: "N.K.Ghosal" <[email-masked]>
Date: Thu, 22 Feb 2001 16:17:45 +0530

With reference to the complex formula mentioned in the above draft ,our observations are  it is a representation of working of TCP , there are many assumptions , like RTO = 5*RTT , the probability distribution function of RTO - RTT relation (Poisson/ Normal Distribution) which cannot be represented by a number.

We have back-calculated the band-width using possible "sensible" values for RTO-RTT relation and yet failed to get the BW. Further, as the equation is a higher order equation, it contains secondary & tertiary peaks which makes back-calculation also difficult. 

We have tried exploring theoretical derivations of the coefficients in the equation but because this involves assumptions of RTO - RTT relation like discrete / continuous time approach we could not make much progress.Please check your formulae's/ delete the same from this draft.

We are attaching a excel spreadsheet which explains what we have tried to do.

Thanks & regards

p.s. In case any clarifications are needed please mail to [email-masked] or [email-masked]