rowe9 - Chapter 9 Communication Circuits Agenda Definition...

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Chapter 9 Communication Circuits
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Agenda Definition Types Media Ownership Error conditions, prevention, and correction
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Definitions Telecommunication circuit Link Data link Channel Data circuit Forward channel (high speed for data) Reverse channel (low speed for control) Node
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Type of Circuits Point-to-point circuits Multipoint circuits or multidrop circuits Two-wire circuits and four-wire circuits Analog Digital circuits ISDN T-carrier systems
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Point-to-Point Circuits Only two points or nodes Between two telephones or terminal to computer More expense Necessary & high volume of traffic
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Multipoint circuits Multidrop circuit or a network Low volume of traffic Less expensive
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Two-wire and Four-wire circuits Two-wire circuits Half-duplex circuits Frequency division multiplexing for full-duplex data flow Standard dial-up telephone Less expensive Four-wire circuits Full-duplex circuits Leased lines More expensive
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Analog Circuits Voice grade circuits Low speed but up to 56,00bps Noise Error Low-speed circuits or subvoice-grade circuits Subdivide voice grade circuit to 12 or 24 circuits Speed ranges between 45 to 200 bps Burglar alarm, fire alarm, telegraph, & Teletypewriter usage Use Amplifier for long distance
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Digital Circuits Data service unit/channel service unit (DSU/CSU) Shape and time the pulses Less complicated Less expensive Need repeater for long distance
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Integrated Services Digital Network (ISDN) - I Types of channels B (bearer) channel: 64kbps data D (delta) channel: 16kbps signal Broadband ISDN (BISDN): a full-duplex circuit or two asymmetrical simplex channel for high speed Access methods Basic rate interface: 2B+D Primary rate interface: 23B+D Broadband ISDN (B-ISDN)
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(ISDN) - II Benefits Efficient Integrated voice and data Programmable to meet user’s need Robust signaling channel for network management International defined open system interface
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This document was uploaded on 11/25/2011.

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rowe9 - Chapter 9 Communication Circuits Agenda Definition...

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