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Cameron
Bipolar (III) Inmate

From: Brisbane
Insane since: Jan 2003

posted posted 12-27-2003 12:08

I've often wondered how a dial-up modem connection can seemingly pull transfer rates over 5.6 k a second. Sometimes when I start a download the little download window in my browser will display a transfer rate well above 5.6 k per second, sometimes up to 20 k (even though I only ever manage to connect at around 4.6k), but this usually settles back to around 4 to 5 k within the first 30 seconds, which makes me thing the browser just didn't catch the first part of the download and that it interprets the transfer speed from a simple time elapsed divided by amount transferred process.

But recently, I've been getting impossibly high transfer rates when download files using Kazaa. I realise that downloading form multiple sources can often attain speeds higher than the connected rate, but this is usually only 1 or 2 k higher.

This, I simply can?t explain (note that I?m only download form one source per file):



And those rates have been sustained since I've connected; downloading 63 Mb in just over an hour:



When downloading via HTTP or FTP, the most I can manage in 4 hours (my connection resets or disconnects every 4 hours to discourage excessive downloading, asside form that it's unlimited and has no bandwidth caps) is about 50 Mb in that 4 hour period and that's on a good day. Suffice to say, I have absolutely no idea how this is happening, not that I'm complaining, but I'd still like to know how.

[This message has been edited by Cameron (edited 12-27-2003).]

Tyberius Prime
Paranoid (IV) Mad Scientist with Finglongers

From: Germany
Insane since: Sep 2001

posted posted 12-27-2003 13:32

a) you're right about browsers having issues timing the start of a download... especially IE I have known to do this
b) modems have a hardware compressing. If you're transfering well compressable data (text,bitmap), you can achive up to about 11kilobyte a second.
c) Those 56k in your modem are kilobit. They translate to 7 kilobyte maximum.
d) Guess what: Browsers mean kilobyte when they say kb. Kazza is talking about kilobits.

Mystery solved?

Tyberius Prime

Emperor
Maniac (V) Mad Scientist with Finglongers

From: Cell 53, East Wing
Insane since: Jul 2001

posted posted 12-27-2003 15:06

Cam: My guess (because I've seen this too) is that when a download starts the code doesn't have enouh information to get a proper average on the download speed so it extrapolates from the information derived from the first few packets and assumes they are the average speed -if the first few packets go out at speeds in the upper range of your speed limit limit then its estimate will actually fall above the range of practical speeds.

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Cameron
Bipolar (III) Inmate

From: Brisbane
Insane since: Jan 2003

posted posted 12-27-2003 16:06

Partially, but I'm still a little puzzled about downloading over 50 Mb in an hour?... I've never come close to anything like that before.

viol
Maniac (V) Inmate

From: Charles River
Insane since: May 2002

posted posted 12-27-2003 17:03

Based on the total of bytes sent and received, you need to share more your files.

Tyberius Prime
Paranoid (IV) Mad Scientist with Finglongers

From: Germany
Insane since: Sep 2001

posted posted 12-27-2003 18:24

hm.. 4352 seconds. 63186839 bytes (neglegting upload - the two directions are independant of each other to my knowledge)
That's 14519 bytes as second. hm


Someone's lying here.

UnknownComic
Paranoid (IV) Inmate

From: Los Angeles
Insane since: Nov 2003

posted posted 12-27-2003 18:45

Or... your modem is about to blow. I had a cheap modem that before it died, started getting high speeds. It was nice for a week or so, but then died. Maybe the governing circuits in your modem are faulting...

I wish there were 56k modem tweaks that bypassed the speed limits artificially imposed on modem users.

[edit] You should cut that horizontal pic in half... it's breaking the layout[/edit]
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[This message has been edited by UnknownComic (edited 12-27-2003).]

Cameron
Bipolar (III) Inmate

From: Brisbane
Insane since: Jan 2003

posted posted 12-27-2003 19:11

TP, that's why I posted this. It just doesn't add up. Alas, it hasn't repeated itself as I've since re-connected and I'm currently at 25 meg after 2 hours, which is about as good as it usually gets appart from that one odd occurance. I wonder if the files I'm downloading will actually work.

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