brian873 Posted May 13, 2008 Share Posted May 13, 2008 Hi I am trying to work out how long it will take to transfer a file over different networks.If I have a 50mb file how long would it take to transfer using gprs @ 80kbps and edge @ 236kbpsany help would be appreciated Link to comment Share on other sites More sharing options...
Mijzelf Posted May 13, 2008 Share Posted May 13, 2008 I suppose that's an 50MB file? With overhead counted you need about 10 bits to transfer a byte, so you'll need 500 Mb.@80kb/s: 500 000 000 / 80 000 = 6250 sec = 1 hour 45 minutes.@236kb/s: 500 000 000 / 236 000 = 2119 sec = 35 minutes.Times are slightly different when you mean MiB and Kib. Link to comment Share on other sites More sharing options...
brian873 Posted May 14, 2008 Author Share Posted May 14, 2008 Thanks Mijzelf great utility !Although I would still like to know how to calculate this, anyone help my brain is thinking too hard about it and I cant find the solution....Any help appreciated Link to comment Share on other sites More sharing options...
Ponch Posted May 15, 2008 Share Posted May 15, 2008 I would still like to know how to calculate thisMijzelf did the math for you.Lets repeat.1byte(B ) = 8bits(b ) (2^8=256 possibilities, enough for all characters), make it ~10 for the whole communication (sort of wrapping).1kB = 1.000bytes and 1mB=1.000.000bytes (=~10.000.000b exchanged) also 1KB=1024 bytes and 1MB=1024KB, but lets round it.-80kbits/s is the speed, it's the volume per time. You want the time, so time=volume/speed but you have to use the same units for both values.(50.000.000 x 10bits) / (80.000bits/sec) = 6250sec = ~104min =~1h44'. This is pure theory, so use 1024 (twice) instead of 1000 and also add ~20% for real world. That gives ~2hours 11'.and so on,1MB on 56k modem ~4min1MB on 10Mb network ~1.2sec10MB on 100Mb network ~1.2sec Link to comment Share on other sites More sharing options...
brian873 Posted May 16, 2008 Author Share Posted May 16, 2008 Thanks Ponch ! I have got it now.... and thanks again MijzelfI think I have just learned somethign new today Link to comment Share on other sites More sharing options...
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