[retrac]

Bandwidth between Los Angeles and New York, very approximately:

1915: 1 kHz - telegraph lines

1925: 10 kHz - a handful of voice channels

1935: 100 kHz - several frequency multiplexed carrier lines across the desert

1945: 200 kHz - a few more lines - war time expansion restrictions

1955: 5 MHz - coaxial cable and microwave links

1965: 20 MHz - coast to coast simultaneous television and tens of thousands of voice channels

1975: 100 MHz - scaling up

1985: 10 GHz - analog to digital phase change - fibre optic and satellite

I still remember the first time I spoke to a person so far away the sun had set and risen in between.