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Channel Capacity

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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Channel Capacity

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

  2. 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 .

  3. 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).

  4. 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.

  5. Analog systems Bandwidth is the difference between the upper ad lower cutoff frequencies of. -3dB bandwidth)

  6. 0 1 0 1 0 0 0 1 0 1 1 0 1 0 0 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

  7. 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)

  8. 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.

  9. 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 .

  10. Thanks For Attention

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