DATA COMMUNICATION

Touro College
Graduate School of Technology
MISIS 640 MA - DATA COMMUNICATION

393335 HUSEYIN KARADENIZ


abstract

Frame Relay is a high-performance WAN protocol that operates at the physical and data page link layers of the OSI reference model. Frame Relay originally was designed for use across Integrated Services Digital Network (ISDN) interfaces. Today, it is used over a variety of other network interfaces as well. This chapter focuses on Frame Relay s specifications and applicat ....etc

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ATM makes B-ISDN a reality. The Integrated services Digital Network (ISDN) evolved during the 80's. It carried a basic channel that could operate at 64kbps (B-channel) and combinations of this and others (D-channels) formed the basis of communication on the network. In the new B-ISDN world, this is supposed to supply data, voice and other communication services over a common network with a wide range of data speeds. To understand a lot of the terminology in ATM-land, it is necessary to understand the B-ISDN Reference Model. Just as the ISO seve ....etc

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earthquake vibration control using modified frame shear wall free pdf download

As performance-based seismic design becomes more prevalent, increasing attention is being given to improving building performance during seismic events. Much attention has been given to improving the seismic performance of steel and concrete structures, with relatively little attention having been given to wood frame buildings. Although life-safety is generally not a significant concern for wood frame buildings, the financial impact associated with the damage to suc ....etc

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Composition Of Frame Relay Network

a) Access Link

b) Port Connection

c) Virtual Circuits

a) PVC Permanent Virtual Circuits

b) SVC Switching Virtual Circuits

d) CIR Committed Information Rate

Frame Relay Format

a) Defines Structure & Organization of Information

b) Flags

c) Header Fields

d) Supports Variable Length Packet Sizes

Frame Relay Features

a) Automatic Re-routing

b) Bursting

c) Statistical Bandwidth Allocation

d) Oversubscription ....etc

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William Stallings Data and Computer Communications 7th Edition



Frequency Domain Concepts

Signal usually made up of many frequencies

Components are sine waves

Can be shown (Fourier analysis) that any signal is made up of component sine waves

Can plot frequency domain functions

Spectrum & Bandwidth

.Spectrum
range of frequencies contained in signal
.Absolute bandwidth
width of spectrum
.Effective bandwidth
Often just bandwidth
Narrow band of f ....etc

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Modems
The modern telephone system is designed to carry the sound of a human voice talking normally. The engineers save money by cutting out the high a low pitch sounds that occur only in music, or sounds that last for a very short period of time. Modems convert data into sound so that it can be sent through the phone system. Just as the telegraph sent data by alternating dots and dashes, the earliest modems sent data by alternating the sound on a phone between two tones. However, modern modems move much larger amounts of data by sending combi ....etc

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The most important development in the computer communications industry in the 1990s is the evolution of the integrated services digital network (ISDN) and broadband ISDN (B-ISDN). The ISDN and B-ISDN have had a dramatic impact on the planning and deployment of intelligent digital networks providing integrated services for voice, data and video. Further, the work on the ISDN and B-ISDN standards has led to the development of two major new networking technologies; frame relay and asynchronous transfer mode (ATM). Frame relay and ATM have become t ....etc

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