3 ms·
Long distance calls were all digital in 1980s, and probably sooner. (I don't know the exact timeframe when analog coax was replaced by T1s.)
by gwbas1c 2y ago
Long distance calls were all digital in 1980s, and probably sooner. (I don't know the exact timeframe when analog coax was replaced by T1s.)
- deleted 2y ago[deleted]
- retrac 2y agoDigitization started quite early (1960s) but it did not finish until decades later. The first transatlantic fibre optic cable was only laid in 1988. Before that communication between North America and Europe was analog. The Internet and other networks of that time linked over the Atlantic with modems over satellite or voice channels on the analog coaxial submarine cables. TAT-7 - 4000 analog 3 kHz channels over coaxial, laid 1983 TAT-8 - 280 Mbit/s over fibre optic, laid 1988