(keitai-l) Re: OT?: Keitai camera image transfer (MMS/mail) throughput analysis?

I agree with Dirk here. There is protocol overhead to consider. In the case 
of PHS data - quoted as 64k (for dual slot), the usable rate is actually 
close to 55k.

Regards

Michael.


>From: Dirk Rösler <lists2003_at_unicircuits.com>
>Reply-To: keitai-l_at_appelsiini.net
>To: keitai-l_at_appelsiini.net
>Subject: (keitai-l) Re: OT?:  Keitai camera image transfer (MMS/mail) 
>throughput analysis?
>Date: Mon, 14 Jul 2003 11:05:13 +0900
>
>
>On Sunday, Jul 13, 2003, at 00:31 Asia/Tokyo, Gerhard Fasol wrote:
>
> > this is easy to answer: you just take the image size (in kbytes)
> > and devide by the data rate.
>
>Not quite correct, you have to consider protocol overheads like
>headers/trailers etc which also need to be transmitted, not just the
>data payload. Then there's also things like acknowledgements which
>require full headers but may have an empty payload. Also data payload
>fields may not be filled 100% all of the time.
>
>So to transfer 50k of data, you are transmitting and receiving more
>than those 50k in total.
>
>I don't know about the protocols and their (in)efficiencies in the
>keitai world though, someone please educate me.
>
>Dirk
>
>
>This mail was sent to address michaelsydenham_at_hotmail.com
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