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UNIERSITY OF PALESTINE SOFTWARE ENGINEERING DEPARTMENT. Data Communications and Networks. Channel Capacity. Submitted By. Abd Elkarim Abu Ghali Ahmed Obaid. Bandwidth.

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Presentation Transcript
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UNIERSITY OF PALESTINE

SOFTWARE ENGINEERING DEPARTMENT

Data Communications and Networks

Channel Capacity

Submitted By

Abd Elkarim Abu Ghali

Ahmed Obaid

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Bandwidth

  • Bandwidth is a central concept in many fields, including information theory, radio communications, signal processing, and spectroscopy.
  • Bandwidth refers to the range of frequencies that a medium can pass without a loss of one-half of the power (-3dB) contained in the signal .
  • With more bandwidth it is possible to transmit more information .
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Definition 1:Bandwidth

Is a measure of frequency range, measured in hertz.

Example

The range of frequencies within which the performance of the antenna, with respect to some characteristics, conforms to a specified standard. (2.4-2.5GHz antenna has 100MHz bandwidth).

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Definition 2:Bandwidth

The amount of data that can be transmitted in a fixed amount of time, expressed in bits per second(bps) or bytes per second.

Example

A V.90 modem supports a maximum theoretical bandwidth of 56 Kbps. Fast Ethernet supports a theoretical maximum bandwidth of 100 Mbps.

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Analog systems

Bandwidth is the difference between the upper ad lower cutoff frequencies of.

-3dB bandwidth)

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Digital systems

  • Find the highest data rate possible for a given bandwidth, B
    • Binary data (two states)

Period = 1/B

  • Nyquist: Max data rate is 2B (assuming two signal levels)
    • Two signal events per cycle
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Data rate

A very important consideration in data communications is how fast we can send data, in bits per second, over a channel.

Data rate depends on three factors:

1. The bandwidth available

2. The level of the signals we use

3. The quality of the channel (the level of noise)

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Datatransferrate (DTR):-

Is the speed at whichdatacan be transmitted between devices. This is sometimes referred to asthroughput. Thedatatransferrateof a device is often expressed in kilobits or megabits per second, abbreviated askbpsandmbpsrespectively. It might also be expressed in kilobytes ormegabytes, orKB/secandMB/sec. Bits are abbreviated in lower case, while bytes use upper case.

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For example,

  • a typical low-speed connection to the Internet may be 33.6kilobits per second (Kbps). OnEthernetlocal area networks, data transfer can be as fast as 10megabits per second.
  • RAID Techniques .
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Thanks

For

Attention