Abstract: In order to test communication protocols with “activity”, AFSM model and it's fault model for these protocols are established first.Two testing methods are preferred then.The first is establishing software tester and hardware tester apart.The second is transforming AFSM to FSM by adding activity messages, then testing activities with signals.Test system's framework using the second method and transform method are analyzed emphasized.At last, an application in CDMA BSC tester is described.

Key words: communication protocols, protocol model, protocol testing