The arrival processes of the two kinds of voice packets are all Poisson processes.After arriving at the mixing module, each packet queues in its finite capacity buffer. 假定兩類(lèi)音頻包的到達為相互獨立的泊松過(guò)程,到達混合模塊后分別在各自的有限容量緩沖區中排隊,混合器的服務(wù)規則依據隊列排隊狀態(tài)而定,服務(wù)時(shí)間服從負指數分布。