Exploration Network Chapter 8 Essay

3672 words - 15 pages

OSI Physical Layer

Network Fundamentals – Chapter 8

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Objectives
 Explain the role of physical layer protocols and services in supporting communication across data networks.
 Describe the role of signals used to represent bits as a frame as the frame is transported across the local media.  Describe the purpose of physical layer signaling and encoding as they are used in networks.  Identify the basic characteristics of copper, fiber and wireless network media.  Describe common uses of copper, fiber and wireless network media.
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Purpose of the Physical Layer

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Physical Layer Standards
 The physical layer technologies are defined by organizations such as:
–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
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Physical Layer Standards
 The technologies defined by these organizations include 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.

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Physical Layer Standards

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Physical Layer Standards

ITE PC v4.0 Chapter 1

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Physical Layer Standards

ITE PC v4.0 Chapter 1

© 2007 Cisco Systems, Inc. All rights reserved.

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Physical Layer Standards

ITE PC v4.0 Chapter 1

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Physical Layer Fundamental Principles
 Three fundamental functions of the physical layer:
–The physical components –Data encoding –Signaling

 The physical components refer to the physical media and its connector.
–Responsible for making sure that signals can travels reliably from one device to another over the physical media.

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Physical Layer Fundamental Principles
 Encoding refers to the method of converting a stream of data bits into a predefined “code”.
–Codes are groupings of bits used to provide a predictable pattern that can be recognized by both the sender and the receiver. –Encoding is also used for control information such as identifying the beginning and end of a frame. •This is normally represented using specific patters of 0’s and 1’s.

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Physical Layer Fundamental Principles
 Signaling refers to the process of converting the encoded bit streams into signals.
–The signals generated is dependant on the physical media. –The method of representing the bits is called the signaling method.

 The processes of encoding and...

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