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S Interface
  • For basic rate access in an ISDN environment, the S interface denotes a user-to-network interface reference point characterized by a four-wire, 144-kbps (2B+D) user rate.
  • Note 1: As a universal interface between ISDN terminals or terminal adapters and the network channel termination, the S interface allows a variety of terminal types and subscriber networks (e. g. , PBXs, LANs, and controllers) to be connected to this type of network.
  • Note 2: At the S interface, there are 4000 frames of 48 bits each, per second, for 192 kbps. The user's portion is 36 bits per frame, or 144 kbps. See also Integrated Services Digital Network, R interface, T interface, U interface.