The Physical Layer Chapter 2. The Theoretical Basis for Data Communication Fourier Analysis Bandwidth-Limited Signals Maximum Data Rate of a Channel.

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Chapter 2 The Physical Layer.

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Presentation transcript:

The Physical Layer Chapter 2

The Theoretical Basis for Data Communication Fourier Analysis Bandwidth-Limited Signals Maximum Data Rate of a Channel

Bandwidth-Limited Signals A binary signal and its root-mean-square Fourier amplitudes. (b) – (c) Successive approximations to the original signal.

Bandwidth-Limited Signals (2) (d) – (e) Successive approximations to the original signal.

Bandwidth-Limited Signals (3) Relation between data rate and harmonics.

Guided Transmission Data Magnetic Media Twisted Pair Coaxial Cable Fiber Optics

Twisted Pair (a) Category 3 UTP. (b) Category 5 UTP. Twisting done to stop cross-talk

Coaxial Cable A coaxial cable.

Fiber Optics (a) Three examples of a light ray from inside a silica fiber impinging on the air/silica boundary at different angles. (b) Light trapped by total internal reflection.

Transmission of Light through Fiber Attenuation of light through fiber in the infrared region. Attenuation in decidels = 10 log_10 (transmitted power/received power)

Fiber Cables (a) Side view of a single fiber. (b) End view of a sheath with three fibers. 1.Terminate in connector 15-20% LOSS 2.Spliced mechanically 10% loss 3.3. Fused to form solid connection

Fiber Cables (2) A comparison of semiconductor diodes and LEDs as light sources.

Fiber Optic Networks A fiber optic ring with active repeaters.

Fiber Optic Networks (2) A passive star connection in a fiber optics network.

Advantages a)Low attenuation, long lines – 50 km b)Power surges, electromagnetic interference, power failure c)Lightweight d)Do not leak light, quite difficult to tap e)Less familiar technology

Class till here