Chuck,
There was something else going on there... From what you've written I can't figure out WHAT is was… But the HDSL2 technology has proven itself VERY reliable for several years and it is actually more resilient than 4-wire due to only needing two conductors.
There really is no difference either on voice or data… 1.544 Mbps is what a T1 one is. What’s IN the train of bits does not matter to the Telco equipment that’s used in HDSL2 it keeps the training a rolling at a fixed (timed) 1.544 Mbps.
