ETS 300 012 Ed.1 (1992)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 ISDNbasic rate user-network interface including the physical,electrical and functional characteristics and the information exchange with higher layers.
Corrigendum '90 COR 1 93' has been withdrawn.
(07/1999)
SS ETS 300 012:1992 - Identical
PN ETS 300 012:1998 - Identical
UNE ETS 300012:1999 - Identical
NS ETS 300 012:1993 - Identical
I.S. ETS 300 012:1993 - Identical
NBN ETS 300 012:1993 - Identical
NF ETS 300 012:1996 - Identical
DIN ETS 300012 (1992-12) - Identical
