Digital subscriber signalling system No. 2 - User-network interface layer 3 specification for point-to-multipoint call/connection control: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma for the user
数字用户信号系统2号.点对多点呼叫/连接控制的用户网络接口第3层规范:用户的抽象测试套件(ATS)和部分协议执行额外测试信息(PIXIT)形式表