Integrated Services Digital Network (ISDN) - Basic Access Interface for S and T Reference Points (Layer 1 Specification)
综合业务数字网(ISDN).S和T参考点的基本访问接口(第1层规范)
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.