Description: Principles of modern exchange notes Introduction CH1_ exchange communication channel ch2 source model-new070327_new-2CH2_ exchange network ch3_Erlang refused to wait for CH3_ digital program-controlled telephone systems and telephone communications network to exchange ch4_ Communication Networks Performance Analysis of Signaling System CH4_ division CH5_ network switching and packet switching network topology ch5_ analysis CH6_ISDN exchange and integrated services digital network analysis of network reliability ch7_
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