I find it much more amazing that T1 dates back to 1962. What could talk at 1.5mbps in 1962? Mainframes I guess?

Then there’s the fact that this speed remained fairly state or the art until DSL and then cable modems.

There was also T3 in the 1990s for a whopping 45mbps. I worked for a bit for an ISP in Cincinnati in college that had one of those running to a data center. That DC was full of racks of Windows NT machines with unused mice hanging off the back of each so they would boot properly.

Those days were both fun and awful. It was really a frontier feeling but the tech was clunky and connectivity was expensive.