ETS 300 200012 : 20001现行
INTEGRATED SERVICES DIGITAL NETWORK (ISDN) - BASIC USER-NETWORK INTERFACE - LAYER 1 SPECIFICATION AND TEST PRINCIPLES
出版：European Telecommunications Standards Institute
专家解读视频
Defines requirements and test principles for the ISDN basic rate user-network interface including the physical, electrical and functional characteristics and the information exchange with higher layers.
I.S. ETS 300 012:1993 - Identical
PN ETS 300 012 : 1998 - Identical
UNE ETS 300012 : 1999 - Identical
NF ETS 300 012 : 1996 - Identical
DIN ETS 300012 E : 1992 - Identical
DIN ETS 300012 : 1992 AMD 2 1996 - Identical
NBN ETS 300 012 : 1993 AMD 2 1999 - Identical
DIN ETS 300012 : 1992 AMD 2 1996 - Identical
