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- is characterized by a Four-wire circuit, 144 kbit/s (2B+D) user rate,
- serves as a universal interface between ISDN terminals or terminal adapters and the network channel termination,
- allows a variety of terminal types and subscriber networks, such as PBXs, local area networks (LANs), and controllers, to be connected to the network, and
- operates at 4000 48 bit frames per second, i.e., 192 kbit/s, with a user portion of 36 bits per frame, i.e., 144 kbit/s.