EN 300 012-1 V1.2.2 (2000)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
DIN EN 300012-1 (2001-05) - Identical
ONORM EN 300012-1:2000 - Identical
NBN EN 300 012-1:2000 - Identical
I.S. EN 300 012-1:2001 - Identical
PN EN 300 012-1:2005 - Identical
SS EN 300 012-1 Ed. 1 (2000) - Identical
NEN EN 300012-1:2000 - Identical
