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FIT1047 Lecture Notes - Lecture 9: Network Interface Controller, Optical Fiber, Square Wave

52 views6 pages
School
Monash University
Department
Information Technology
Course
FIT1047
Professor
Carsten Rudolf

For unlimited access to Class Notes, a Class+ subscription is required.

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Document Summary

= implems dl and p layers (in server) Includes unique dl layer address (mac [media access. Implems protocols (error detection, construction of frames, modulation/encoding etc) Often build into motherboards, or connected via usb, pci. Utp (unshielded twisted pair) - most common for lan. Optical fibre - not yet common in lans. Info transmitted using physical signals, which travel through diff mediums. Discrete values (eg. 0, 1, or chars in alphabet) Discrete step from 1 symbol to the next. Range of possible values (eg. temp, air pressure) Wave form w/ limited number of discrete states (sq wave) Continuous (often sinusoidal) wave (eg. sound [pressure wave in air], light and radio. D sig; d data old ethernet, usb, the bus in a computer. Signal encodes 0s and 1s into diff voltage levels on the cable --> square wave. For sender, difficult to distinguish since difference in voltage so small. Measures fixed time window for each bit being transmitted to decode msg.

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