Speed matters: how Ethernet went from 3Mbps to 100Gbps... and beyond

By Iljitsch van Beijnum.

Although watching TV shows from the 1970s suggests otherwise, the era 
wasn't completely devoid of all things resembling modern communication 
systems. Sure, the 50Kbps modems that the ARPANET ran on were the size 
of refrigerators, and the widely used Bell 103 modems only transferred 
300 bits per second. But long distance digital communication was common 
enough, relative to the number of computers deployed. Terminals could 
also be hooked up to mainframe and minicomputers over relatively short 
distances with simple serial lines or with more complex multidrop 
systems. This was all well known; what was new in the '70s was the local 
area network (LAN). But how to connect all these machines?

http://arstechnica.com/gadgets/news/2011/07/ethernet-how-does-it-work.ars/
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