It is a switching service that provides data transmission in the range between 1.544 Mbit/s (T1 or DS1) to 45 Mbit/s (T3 or DS3).
Služba poskytovala rychlost přenosu dat v rozsahu od 1,544 Mbit/s (T1 nebo DS1) do 45 Mbit/s (T3 nebo DS3).