CMPE 150 Fall 2005 Address 6.


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CMPE 150-Introduction to Computer Networks. Fiber Optics. Optical transmission. Optical ... Identifier: produces electrical heartbeat when sees light. ...
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CMPE 150 Fall 2005 Lecture 6 Introduction to Networks and the Internet

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Announcements Labs: 1 opening either M or W 4-6pm. Other opening? T or Th 6-8pm? To begin with lab is one week from now. TA available time: T 6-7pm and Th 1-2pm in BME 314.

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Last Class PHY. Simple and computerized innovation/correspondence. Digitization. Testing period and examining rate. Bit rate. Sign and frameworks. Occasional signs. Fourier arrangement. Transmission capacity restriction. Channel limit.

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Today PHY (cont\'d). T1 demo.

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Guided Transmission Data Magnetic Media Twisted Pair Coaxial Cable Fiber Optics

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Magnetic Media Examples? Preferences? Disservices?

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Twisted Pair Oldest yet at the same time extremely basic. Phone framework. Shoddy and compelling for long ranges. Groups of turned sets. Can transmit both simple and advanced signs. Data transfer capacity relies on upon thickness of wire and separation voyaged. Mb/s for couple of kilometers.

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Twisted Pair (a) Category 3 UTP. (b) Category 5 UTP.

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Twisted Pair http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci211752,00.html

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Coaxial Cable Better execution than bent pair, i.e., higher transfer speed and more separations. Great clamor invulnerability. In any case, Bandwidths near 1GHz. Utilized broadly as a part of phone systems for more separations; yet bit by bit being supplanted by fiber. Utilized for CATV!

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Coaxial Cable

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Fiber Optics Optical transmission. Optical transmission framework: light source, medium, and finder. Beat of light = "1". No light = "0". Transmission medium: ultra dainty fiber of glass. Finder: produces electrical heartbeat when sees light.

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Transmitting Light (a) Three case of a light beam from inside a silica fiber impinging broadcasting live/silica limit at various points. (b) Light caught by aggregate inner reflection.

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Fiber Cables (a) Side perspective of a solitary fiber. (b) End perspective of a sheath with three strands.

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Fiber Optic Networks A fiber optic ring.

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Fiber Optic Networks (2) A detached star association in a fiber optics system.

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Fiber versus Copper Wire Fiber can deal with much higher data transfer capacities. Low constriction: 50km without repeater. Unaffected by force surges/blackouts, and obstruction. Fiber is slim and lightweight: simple to convey and include new limit. Hard to tap. Yet,

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Fiber versus Copper (cont\'d) Fiber can be harmed effortlessly. Optical transmission is unidirectional, so require 2 strands or 2 frequencies for 2-way correspondence. Fiber and fiber interfaces is more costly.

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Public Switched Telephone System Structure of the Telephone System The Politics of Telephones The Local Loop: Modems, ADSL and Wireless Trunks and Multiplexing Switching

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Structure of the Telephone System (a) Fully-interconnected system. (b) Centralized switch. (c) Two-level order.

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Structure of the Telephone System (2) An average circuit course for a medium-separation call.

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Major Components of the Telephone System Local circles: Connection from supporter of end office. Trunks Outgoing lines associating workplaces. Toll office: Connects end workplaces. Exchanging workplaces Where calls are moved starting with one trunk then onto the next.

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