DIN EN 300481:2000 终端设备(TE).综合业务数字网(ISDN).B-通路集合单元(CAU).程序和终端要求
Terminal Equipment (TE) - Integrated Services Digital Network (ISDN) - B-Channel Aggregation Unit (CAU); procedures and terminal requirements (Endorsement of the English version EN 300481 V 1.2.2 (1997-12) as German standard)