Integrated Services Digital Network (ISDN); attachment requirements for terminal equipment to connect to an ISDN using ISDN basic access; layer 3 aspects; english version ETS 300104:1991
综合业务数字网(ISDN);使用ISDN基本接入连接到ISDN的终端设备的附件要求;第三层方面;英文版ETS 300104:1991