[john37386]

T1 maximum speed 1.544 Mbps T3 is about ~45 Mbps

Reference: https://en.wikipedia.org/wiki/T-carrier

[lifeisstillgood]

My memory is very hazy - too many beers in North London pubs far too many years ago to remember clearly :-0

[hazeii]

And it was probably an E3 (Uk/Europe is E1/E3, US/JP is T1/T3)

[morei]

E3 is ~34Mbps, so it probably wasn't. It's true that the E1/E2/E3 hierarchy is used outside the US, but links to the US can be either depending on carrier preference.

The T1/T2/T3 and E1/E2/E3 hierarchies join at the STM-1 level: An STM-1 can be subdivided as 4 x E3s or 3 x T3s.

This means that on a EU<->US SDH link, an STM-1 can be demuxed into either E3s or T3s, so you can have both standards on the same fiber.

[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.