A T-interface or T reference point is used for basic rate access in an Integrated Services Digital Network (ISDN) environment.
It is a User–network interface reference point that is characterized by a four-wire, 144 kbit/s (2B+D) user rate.
Other characteristics of a T-interface are: The T interface is electrically equivalent to the S interface, and the two are jointly referred to as the S/T interface.
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