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Spring 2000 John Kristoff 1
Physical Layer
Computer Networks
Spring 2000 John Kristoff 2
Numbering Systems
BinaryHexadecimalDecimal
Spring 2000 John Kristoff 3
Transmission of Information
From Physics Energy Electromagnetic wave propogation
From Mathematics Coding Theory
Spring 2000 John Kristoff 4
Analog and Digital Signaling
Spring 2000 John Kristoff 5
Amplitude Modulation
Spring 2000 John Kristoff 6
Frequency Modulation
Spring 2000 John Kristoff 7
Baseband and Broadband
Spring 2000 John Kristoff 8
Phase Modulation
Spring 2000 John Kristoff 9
Modems
Spring 2000 John Kristoff 10
Digital Encoding
Spring 2000 John Kristoff 11
CSU/DSU
Spring 2000 John Kristoff 12
Undesirable Effects and Limitations
Propagation DelayBandwidthNoiseInterferenceDistortionAttenuation
Spring 2000 John Kristoff 13
Sampling and Nyquist’s Theorem
Spring 2000 John Kristoff 14
Shannon’s Limit
Corrects for SNR
Encoding more bits per cycle time helps, but you cannot overcome the fundamental physical limits of a real transmission system.
Spring 2000 John Kristoff 15
Timing
Asynchronous bit level
Synchronous character level
Isochronous timing coordination must be successful
Spring 2000 John Kristoff 16
Transmission Media
Spring 2000 John Kristoff 17
Connectors
Spring 2000 John Kristoff 18
Media Test and Measurement
Hands-on Demo
Spring 2000 John Kristoff 19
Repeaters
Signal RegenerationClean upAmpliflyDistance Extension
Spring 2000 John Kristoff 20
Hubs
Repeater functionality, plus...Concentration PointSignal Distribution DeviceManagement Functions
Spring 2000 John Kristoff 21
Throughput versus Bandwidth
Usable capacityDetermined by
engineering
Electrical PropertyDetermined by
physics