History of the Internet

[rry2k]

Hi,

I'm preparing for a class I'm teaching and I'm giving a small PowerPoint presentation on the history of the Internet. My information shows the transfer rate of bits per second after the invention of the T1 but I need a comparision rate for pre T1. i.e. does anyone know/remember the rate for 2400 baud?

Thanks..Russ

 

[bgauntt]

Is this what info you are looking for:

2400 bps modems that conform to the CCITT V.22 recommendation (virtually all of them) actually use a baud rate of 600 when they operate at 2400 bps. However, they also use a modulation technique that transmits four bits per baud:


600 baud X 4 bits per baud = 2400 bps


or


600 baud
------------------ = 2400 bps
1/4 baud per bit

 

[rry2k]

You went way over my head on that one. What I'm looking for is a comparision between how faster data can be transfered over the interent now vs. how fast it was in the beggining.
Like Arpnet time frame or something close.

Thanks..Russ

 

[cdogg]

Some of the first modems connected at speeds of 300 bps or less. In comparison, a T1 line can transfer up to 1.5 Mbps. To go even further, there are T3 (approx 45Mbps) and DS12 (178 Mbps) lines capable of much faster speeds.

Learn more here:

http://www.howstuffworks.com/modem1.htm

 

[rry2k]

Great, thanks..Russ

 

[Guest_imported]

don't forget the BBS, this is something worth mentioning.

 

[dakota81]

ah the bbs's and their messaging networks - took up to a week & a half to get a response sometimes