A.K.A. BRI - a terminating connection to an ISDN connection. Provides a segment of a PRI or Primary Rate Interface, allowing up to two B-channels or "splinters" of 64Kbps Internet access. So if you use both B-channels, you get 128Kbps

In Australia, Telstra offers a connection through an OnRamp 2 MTU (Media Termination Unit) to provide up to 128Kbps access through a single Cat5 cable into an Internet Router. Cheap and easy solution.

Problem: Telstra provide no feedback to their connections, no link lights, no connection status, and the phone lines do not provide a dial tone. So you cannot check it unless you phone their telephone support desk and know the line number.

Note that there is no connection between BRI and Internet Access - one does not necessarily imply the other.

Two NT1's at two different sites coupled with suitable routers at each end can provide an admirable point-to-point link, which in no way need involve the Internet or any other network bar your own.