ETS 300 011-3-1998 综合业务数字网(ISDN);初级速率用户网络接口(UNI);第3部分:接口 IA 和 IB 的实施一致性声明(ICS)和实施额外信息测试(IXIT)形式规范(第二版)
Integrated Services Digital Network (ISDN); Primary Rate User-Network Interface (UNI); Part 3: Implementation Conformance Statement (ICS) and Implementation eXtra Information for Testing (IXIT) Proforma Specification for Interface IA and IB (Second Editio