Chapter 8 Study Guide

Chapter 8 Study Guide - SEMESTER 1 Chapter 8 Physical Layer...

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SEMESTER 1 Chapter 8 Physical Layer V 4.0 8.1.1 What does the physical layer provide? The OSI Physical layer provides the means to transport across the network media the bits that make up a Data Link layer frame. What are the four elements of delivering frames across the media? The physical media and associated connectors A representation of bits on the media Encoding of data and control information Transmitter and receiver circuitry on the network device 8.1.2 What are the three basic forms of media? Copper cable Fiber Wireless What are the three concerns when the physical layer encodes bits? the devices on the media would not recognize when a frame has been fully received 8.1.3 What does the physical layer consist of? Hardware, developed by engineers, in the form of electronic circuitry, media, and connectors. What are the organizations that are responsible for physical layer standards? The International Organization for Standardization (ISO) The Institute of Electrical and Electronics Engineers (IEEE) The American National Standards Institute (ANSI) The International Telecommunication Union (ITU) The Electronics Industry Alliance/Telecommunications Industry Association (EIA/TIA) National telecommunications authorities such as the Federal Communication Commission (FCC) in the USA. 8.1.3. 2 The technologies defined by these organizations include what four areas of the Physical layer standards? Physical and electrical properties of the media Mechanical properties (materials, dimensions, pinouts) of the connectors Bit representation by the signals (encoding) Definition of control information signals 8.1.4 What are the three fundamental functions of the Physical layer? The physical components Data encoding Signaling What are the two values that the physical layer encodes? Encoding, Signaling 8.2.1 How are the bits of the frame transmitted by the physical layer? Eventually, all communication from the human network becomes binary digits, which are transported individually across the physical media.
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What is a bit time? Although all the bits that make up a frame are presented to the Physical layer as a unit, the transmission of the frame across the media occurs as a stream of bits sent one at a time. The Physical layer represents each of the bits in the frame as a signal. Each signal placed onto the media has a specific amount of time to occupy the media. How are the signaling and receiving ends clocks synchronized in the LAN? At the Physical layer of the receiving node, the signals are converted back into bits. The bits are then examined for the start of frame and end of frame bit patterns to determine that a complete frame has been received. The Physical layer then delivers all the bits of a frame to the Data Link layer. What characteristics can be
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Chapter 8 Study Guide - SEMESTER 1 Chapter 8 Physical Layer...

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