Data Communications andNetworkingChapter 6MultiplexingReferences:BookChapter6Data and Computer Communications, 6th edition,by WilliamStallings
Chapter 6 Multiplexing References: Book Chapter 6 Data and Computer Communications, 6th edition, by William Stallings Data Communications and Networking
ScheduleSignalencoding:5hoursMultiplexing: 1 hourError detection & correction: 2 hoursFlow control & error control:3 hoursCircuit switching & packet switching: 2.5 hoursRouting: 2.5 hoursLAN overview: 2 hoursEthernet: 2 hoursWiFi: 1 hour
Schedule Signal encoding: 5 hours Multiplexing: 1 hour Error detection & correction: 2 hours Flow control & error control: 3 hours Circuit switching & packet switching: 2.5 hours Routing: 2.5 hours LAN overview: 2 hours Ethernet: 2 hours WiFi: 1 hour
Outline. Frequency division multiplexingcan be used with analog signals Synchronous time division multiplexingcan be used with both digital signals and analogsignals.? Statistical time division multiplexingcan be used with both digital signals and analogsignals
Outline • Frequency division multiplexing can be used with analog signals. • Synchronous time division multiplexing can be used with both digital signals and analog signals. • Statistical time division multiplexing can be used with both digital signals and analog signals
Multiplexing1link,nchannelsn inputsMUXDEMUXn outputsHow to share the capacity of a data link?FDM: Frequency Division MultiplexingTDM: Time Division Multiplexing Synchronous TDM Statistical TDM
Multiplexing How to share the capacity of a data link? ▪ FDM: Frequency Division Multiplexing ▪ TDM: Time Division Multiplexing • Synchronous TDM • Statistical TDM
Frequency Division Multiplexing FDM: A number of signals can be carriedsimultaneously-Each signal is modulated to a different carrierfrequency-Carrier freguencies are sufficiently separated sosignals do not overlap (guard bands)Available bandwidth of medium exceeds thesum of all channelsExamples: broadcast radio, cable TV Channel allocated even if no data
Frequency Division Multiplexing • FDM: A number of signals can be carried simultaneously. —Each signal is modulated to a different carrier frequency —Carrier frequencies are sufficiently separated so signals do not overlap (guard bands) • Available bandwidth of medium exceeds the sum of all channels • Examples: broadcast radio, cable TV • Channel allocated even if no data