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T1
If ISDN isn't enough digital carrier for you, T1 offers faster speeds. T1 is a term coined by AT&T for a system that transfers digital signals at 1.544 megabits per second (as opposed to ISDN's mere 64 kilobits per second). Of course, if T1 doesn't cut it, there's always T3. (T2 seems to have been bypassed altogether.)
T3
When you're transferring data across a digital carrier, T3 is the premium way to go. It's not just three times the capacity of T1, as the name suggests--it's almost 30 times the capacity. It can handle 44.736 megabits of digital data per second.