RE: On PDFs

Subject: RE: On PDFs
From: "Dick Margulis " <margulis -at- mail -dot- fiam -dot- net>
To: "TECHWR-L" <techwr-l -at- lists -dot- raycomm -dot- com>
Date: Thu, 24 Apr 2003 16:32:07 -0400


Whoa there, Alan! You're a cuppa coffee short this afternoon. Kbps is kiloBITS per second, not kiloBYTES per second.

Let's start over. 1 KB = 1,024 bytes = 8,192 bits. MIME encoding blows that up by a factor of about 1.5 for reasons not entirely clear to me, so call it 12,000 bits. At 56 Kbps, that's a little over 0.2 s per KB or about 3 m per MB.

Or did I screw up, too?

Dick

"Miller, Alan" <Alan -dot- Miller -at- prometric -dot- com> wrote:

>
>rbilbao -at- us -dot- amadeus -dot- net asked:
>>>Does anyone know where I can get some cold hard facts about PDF download times?<<
>
>Easy question. <Rhetorical question>So how come nobody's answered it yet?</Rhetorical question> The answer is: "In your calculator." :-{) Use this simple formula:
>
>File size (bytes) / Transfer rate (bytes per second) = Time for transfer (seconds)
>
>If your file size is given in kb, multiply by 1024 to get bytes (a kb is *not* 1000 bytes; it's 2^10 bytes, or 1024). Likewise, multiply Mb by 1,048,576 to get bytes (a Mb is 2^20). Then, divide by the transfer rate (56,000 bytes per second; this time kbps *is* 1000 bytes per second).
>
>If you have a 1 kb (1024 bytes) file to download at 56 kbps, you get:
>
>1024 bytes / 56,000 bytes/s = 19 s (rounded to two significant digits, the lowest precision of my input numbers)
>
>Hmmm. Looks like a thumb-rule to me: 1 kb at 56 kbps = 19 s
>
>If you want minutes, divide by 60; for hours, divide by 3600.


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