DCF Week 3 Notes - Physical Layer ● ● ● Contains all electrical mechanical and procedural interfaces to transmit over all LANs and WANs ○ Most

DCF Week 3 Notes - Physical Layer ● ● ● Contains all...

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Physical Layer Contains all electrical, mechanical, and procedural interfaces to transmit over all LANs and WANs Most complex layer of TCP/IP model Defines means of transmitting raw bits of data link frame over physical link Determines whether to use digital or analog signals Electricity and Magnetism Any atomic structure has an EM field Currents and static electricity are examples of an EM field Basic Elementary school science stuff Characteristics of Signals 3 characteristics: Amplitude: height of the signal measured from the horizontal axis Height of wave indicates higher voltage/amperes/watts Frequency: how many periods of the signal are completed in a second Measured in Hertz Period: amount of time it takes to complete one cycle Phase: describes position of the waveform relative to zero Measured in degrees Types of Signals 2 types: Analog: sine wave, a wave that have a continuous rising and falling em signals
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