On Wed, 17 Nov 1999 [email protected] wrote:
> Assume packet size = p bits. (note that p is only useful payload)
> Assume bit error rate = b (after taking into account the advantage gained by
> FEC, etc.)
>
> PER = 1 - (1 - b)^^p (^^ Indicates exponential)(superscript: )
> For small b, this comes to approximately bp.
>
> Is this reasonable?
Only if your ACKs are the same size as your packets...
TCP's performance will be heavily affected by loss at the higher-error
end of the range, and your formula doesn't reflect that.
Some of the discussion in the PILC archives (which most of this list
is subscribed to anyway) covers this in more detail.
L.
<[email protected]>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>
> Regards,
> Abheek
>
> Giacomo Morabito <[email protected]> on 11/17/99 03:18:56 AM
>
> Please respond to [email protected]
>
> To: [email protected]
> cc: (bcc: Abheek Saha/HSS)
>
> Subject: packet loss probability
>
> Please, I have a question.
>
> What are the typical values of the "packet loss probabilities"
> due to link errors in satellite links, or, alternatively,
> what are the values of the packet loss probability corresponding
> to a BER going from 10^{-9} to 10^{-4}?
>
> I hope that someone can help me.
>
> Best regards,
> Giacomo
>
> -----------------------
> Dr. Giacomo Morabito
> Research Engineer
> Broadband & Wireless Networking Laboratory
> School of Electrical and Computer Engineering
> Georgia Institute of Technology
> Atlanta, GA 30332
>
> Tel.: (404) 894-6616
> Fax.: (404) 894-7883
> E_mail: [email protected]
> http://www.ee.gatech.edu/~giacomo
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