ETS 300 012-1 Ed.2 (1998)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
This issue incorporates the test suite specification and referenced materials from ITU-T I.430.
PN ETS 300 012-1:2005 - Identical
SS ETS 300 012-1 Ed. 1 (1998) - Identical
SS ETS 300 012-3 Ed. 1 (1998) - Identical
NS ETS 300 012-1:1998 - Identical
I.S. ETS 300 012-1:2001 - Identical
NBN ETS 300 012 1:1999 - Identical
