1 / 10

Channel Capacity

This document explores the concept of bandwidth, a fundamental aspect of data communications and networking. It outlines definitions of bandwidth, including its measurement in hertz and its significance in data transfer rates. The text discusses examples of bandwidth in various systems, including modems and Ethernet, and introduces critical factors influencing data transfer rates, such as bandwidth availability, signal levels, and channel quality. Readers will gain insights into how bandwidth impacts the efficiency and speed of data transmission across networks.

honorato-graham
Télécharger la présentation

Channel Capacity

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related