PROTOCOL(协议) rule and procedures to govern transmission between component in a network
HUANG Lihua, Fudan University PROTOCOL（协议） • rule and procedures to govern transmission between component in a network. *
omponents of Telecommunication Systems: Computers Host computer(Mainframe computer) Front-end processor (Midrange computer) Network Server(Microcomputer) 4.5
HUANG Lihua, Fudan University Components of Telecommunication Systems : Computers • Host computer (Mainframe computer) • Front-end processor (Midrange computer) • Network Server (Microcomputer) 1 2 3 2 4,5
Omponents of Telecommunication Systems: Terminals Personal computers Network computers Video terminals Other 1o devices( telephone, POS Terminals 3
HUANG Lihua, Fudan University Components of Telecommunication Systems : Terminals • Personal computers • Network computers • Video terminals • Other I/O devices( Telephone, POS) Terminals 1 2 3 2
Communication processors Modem: modulation and demodulation Modulation(ia fi) perform conversion from digital to analog Demodulation( i) perform conversion from analog to digital Multiplexor(多路转接器): An electronic device that allows a single communication channel to carry transmissions simultaneously from many source Internetwork Processors: A specialized computer that manages all routing communications with peripheral devices Switches交换机 Routers路由器 Hubs网络集线器 Gateways网关
HUANG Lihua, Fudan University Communication Processors • Modem: Modulation and Demodulation – Modulation(调制):perform conversion from digital to analog; – Demodulation(解调):perform conversion from analog to digital. • Multiplexor(多路转接器):An electronic device that allows a single communication channel to carry transmissions simultaneously from many source. • Internetwork Processors :A specialized computer that manages all routing communications with peripheral devices. – Switches交换机 – Routers路由器 – Hubs网络集线器 – Gateways网关
Communication Network H R1 h2 R R)①/ R R H H Router or switch Host Node
HUANG Lihua, Fudan University Communication Network Hi R1 H2 R2 H3 Rj Rn Ri Hm H1 Host Router or Switch Node