Defines generic requirements for switch processing time. Covers methodology for categorizing the various types of switch processing, and specifies mean and 95% values as requirements for each of these categories. The switch processing time requirements are applicable to various disciplines, including Advanced Intelligent Network (AIN), Common Channel Signalling (CCS), Integrated Services Digital Network (ISDN) Access, MultiFrequency (MF) signalling, and operator services. Switch processing times are primary performance characteristics as they represent the switches' contribution to the delays that telecommunications and end users perceive.