Specifies the 8-pole connector (plug and jack) and the assignments of poles/contacts for use in physical interfaces of Integrated Service Digital Network (ISDN) basic access arrangements. These physical interfaces, where they exist, will be located at reference points S and T and shall conform to CCITT Recommendation 1.430 which requires plugs and jacks on equipment connecting cords and interface cables to comply with that recommendation. This Standard is identical with ISO 8877:1987.