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

• zenexer 6y ago
  T1 and Tier 1 are not the same thing.
  • tinus_hn 6y ago
    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.