|reply to xQim |
IDSL is just ISDN for data. That is why it is 144kbps, two 64kbps bearer channels plus the 16kbps control channel. IDSL uses the same signalling as ISDN. It is my understanding that it requires repeaters to cover that distances you mentioned. I assume the cost of repeaters makes the long distance version uncompetitive.
I think G4 communication used to offer ISDN. Just looked at their website and can't tell of it is still available. Try giving them a call. They are a true CLEC and rent copper for FairPoint but colo equipment at the various central offices.