T-interface: For basic rate access in an Integrated Services DigitalNetwork (ISDN) environment, a user-to-network interfacereference point[?] that (a) is characterized by a four-wire, 144-kb/s (2B+D) user rate, (b) accommodates the link access and transport layer function in the ISDN architecture, (c) is located at the user premises, (d) is distance sensitive to the servicing network terminating equipment, and (e) functions in a manner analogous to that of the Channel Service Units (CSUs) and the Data Service Units[?] (DSUs).
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If the discriminant is positive, then there are two different solutions x, both of which are real. ...