Part_6_Mutliplexing

Part_6_Mutliplexing - Multiplexing: Resource Sharing EE450:...

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EE450, USC, Zahid 1 Multiplexing: “Resource Sharing” EE450: Introduction to Computer Networks Professor A. Zahid
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EE450, USC, Zahid 2 Multiplexing z Multiplexing is a resource sharing process allowing information from several information sources to be aggregated onto a single, high-speed link Channel-side Aggregate-side Aggregate link Point-to-Point WAN Link n Channels n Channels
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EE450, USC, Zahid 3 Categories of Multiplexing Synchronous TDM Statistical TDM
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EE450, USC, Zahid 4 Frequency Division Multiplexing z Useful bandwidth of medium exceeds required bandwidth of channel z In FDM, each signal is modulated to a different carrier frequency z Carrier frequencies separated so signals do not overlap (guard bands), example: Broadcast Radio
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EE450, USC, Zahid 5 FDM Process Transmitter Receiver
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EE450, USC, Zahid 6 Example: FDM of Voice Signals
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EE450, USC, Zahid 7 Time Division Multiplexing (TDM) Time Slots
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EE450, USC, Zahid 8 Synchronous TDM z Data rate of medium exceeds data rate of digital signal to be transmitted z Multiple digital signals interleaved in time z May be at bit level or block of bits z Time slots pre-assigned to sources and fixed z Time slots allocated even if source is idle z Time slots do not have to be evenly distributed amongst sources
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EE450, USC, Zahid 9 Synchronous TDM (Cont.) In synchronous TDM, the data rate of the link is n times faster, and the unit duration is n times shorter.
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EE450, USC, Zahid 10 Synchronous TDM (Cont.)
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EE450, USC, Zahid 11 Empty Time Slots Empty TS can’t be used by other Sources Waste of Bandwidth
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EE450, USC, Zahid 12 Multilevel Multiplexing
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EE450, USC, Zahid 13 Multiple-Slot Multiplexing
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EE450, USC, Zahid 14 Example
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EE450, USC, Zahid 15 Digital Carrier Hierarchy (US) z US system based on DS-1 format z Multiplexes 24 channels z Each frame has 8 bits per channel plus one framing bit 193 bits/frame. Frame Duration is 125 µ seconds
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EE450, USC, Zahid 16 T1 illustrated
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EE450, USC, Zahid 17 Digital Hierarchy (US)
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Part_6_Mutliplexing - Multiplexing: Resource Sharing EE450:...

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