Information processing systems; interface connector and contact assignment for ISDN basic access interface located at reference points S and T (ISO 8877, 1st edition 1987), EN 28877:1990— 15 стр.
Information technology; telecommunications and information exchange between systems; interface connector and contact assignment for ISDN basic access interface located at reference points S and T (ISO/IEC 8877:1992); English version EN 28877:1993— 16 стр.
Information technology; telecommunications and information exchange between systems; interface connector and contact assignment for ISDN basic access interface located at reference points S and T (ISO/IEC 8877:1992); English version EN 28877:1993— 16 стр.
