ANSI T1.601-1999

ISDN Basic Access Interface for Use on Metallic Loops for Application at the Network Side of NT, Layer 1 Specification

This interface standard was written to provide the minimal set of requirements to provide for satisfactory transmission between the network and the NT, while conforming, wherever possible, with the I-Series of International Telegraph and Telephone Consultative Committee (CCITT) Recommendations, and while not compromising the principles of evolution expressed therein. Equipment may be implemented with additional functions and procedures. This standard presents the electrical characteristics of the integrated services digital network (ISDN) basic access signals appearing at the network side of the NT. It also describes the physical interface between the network and the NT. The transport medium of the signal is a single twisted-wire pair that supports full-duplex (i.e., simultaneous two-way) service.