Time taken to download for various Broadband Speeds

A recent business proposal required me to calculate the time taken to download huge files. Being a BSNL Dataone user, I was comparing it with various plans including the Home unlimited plan for Rs.900.

1 MB = 1024 KB = 1024 * 1024 bytes

= 1048576 bytes

= 1048576*8 = 8388608 bits

Bandwidth in K bps (Kilo Bits Per Second) Speed in Kilobytes per Second Time taken to download a 1MB(1024Kilobyte) file
under ideal conditions in seconds
256 K bps = 256 * 1024 bps = 262144 bps 256/8 = 32 KB/S 8388608/262144 = 32
384 48 21.33
512 64 16
1024 (1Mbps) 128 8
2048 (2Mbps) 256 4
4096 (4Mbps) 512 2
8192 (8Mbps) 1024 1

BSNL offers 256Kbps guaranteed speed with a maximum of 2Mbps. So you can theoretically download a 1Mb file in …well under 4 seconds. So that’s under ideal conditions. I have seen download progresses for my 256Kbps connections at the range of 200KB/s. A lot depends on the server’s bandwidth too.
So how much does a 1GB file take to download with a 1 Mbps connection ? From the above table, 8 seconds for 1MB = 8 *1024 for 1GB = 8192 seconds = 136.53 minutes = approximately 2 and a half hours..

Update as on 14-3-08
I’m getting a download speed of 312Kb/s on my home 500 plan which means the speeds are crossing the 2Mbps speeds.

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