EN 300 012-1 : 1.2.2现行
INTEGRATED SERVICES DIGITAL NETWORK (ISDN); BASIC USER-NETWORK INTERFACE (UNI); PART 1: LAYER 1 SPECIFICATION
出版：European Telecommunications Standards Institute
专家解读视频
Describes requirements for the ISDN basic rate UNI including the physical, electrical and functional characteristics and the information exchange with higher layers.
NBN EN 300 012-1 : 2000 - Identical
NEN EN 300012-1 : 2000 - Identical
DIN EN 300012-1 : 2001 - Identical
I.S. EN 300 012-1:2001 - Identical
PN EN 300 012-1 : 2005 - Identical
