ATIS T1.605-1991 (R2004)
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Integrated Services Digital Network (ISDN) – Basic Access Interface for S and T Reference Points (Layer 1 Specification)
This standard presents the electrical characteristics of the Integrated Services Digital Network (ISDN) Basic Access signals appearing at the S and T reference points. It also describes physical interface between a TE and an NT. This interface standard was written to provide the minimal set of requirements to provide for satisfactory transmission between a TE and an NT. Equipment may be implemented with additional functions and procedures.
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