ETSI PRETS 300 061-6-1997 综合业务数字网(ISDN).子寻址(SUB)补充业务.数字用户1号信令系统(DSS1)协议.第6部分:抽象测试套件(ATS)及部分协议额外测试信息实现(PIXIT)
Integrated Services Digital Network (ISDN); Subaddressing (SUB) Supplementary Service; Digital Subscriber Signalling System No. One (DDS1) Protocol; Part 6: Abstract Test Suite (ATS) and Partial Protocol Implementation eXtra Information for Testing (PIXIT