[tinus_hn]

In internetworking a Tier 1 carrier is a carrier that is so interconnected other parties pay to receive traffic from them.

[zenexer]

T1 and Tier 1 are not the same thing.

[tinus_hn]

That’s true. However at least in my memory back in the day people would call the 10 megabit directly connected university connections t1 lines, because of the tier 1 thing.