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ALSO CALLED: Integrated Services Digital Network Hardware, ISDN Modems, ISDN Devices, ISDN Routers
DEFINITION: In Integrated Services Digital Network (ISDN) service, a T interface is the electrical interface between a network terminating unit 1 (NT1) and a network terminating unit 2 (NT2) device, which typically is a private branch exchange (PBE). Like the S interface, the T interface has four wires, allowing up to eight devices to be addressed. In Basic Rate Interface (Basic Rate Interface in ISDN) ISDN,  … 
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ISDN HARDWARE DEFINITION (continued): …  the bits that flow from the central office through the NT1 are divided into two 64 Kbps channels (known as B, or bearer, channels) and one 16 Kbps channel (the D, for data or delta, channel) for control signals. The control signals allow a specific device to be addressed. The following table summarizes the various ISDN electrical interfaces at different demarcation points or places in the traffic flow: Electrical interfaceBetween what two pointsU interfaceCentral office and NT1T interfaceNT1 and NT2 devices (such as a PBX)S interfaceNT1 or NT2 and ISDN devices (such as a telephone or terminal … 
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