Bandwidth

1
Bandwidth

• Kevin Morrison
• kevinvmorrison_at_yahoo.com
• Management Information Systems
• MWF 1-150pm

2
Table of Content

• Subject Pages
• Definition----------------------------------- 3
• Bandwidth Description------------------ 4-6
• Bandwidth Traffic------------------------- 7-10
• Bandwidth Interview Info.-------------- 11
• Bandwidth Interview--------------------- 12-14
• Bandwidth Uses-------------------------- 15
• Stealing Bandwidth---------------------- 16-18
• Steps to Avoid Bandwidth Theft------ 19-20
• Bibliography------------------------------- 21

3
Definition

• (1) A range within a band of frequencies or
  wavelengths.
• (2) The amount of data that can be transmitted in
  a fixed amount of time. For digital devices, the
  bandwidth is usually expressed in bits per second
  (bps) or bytes per second. For analog devices,
  the bandwidth is expressed in cycles per second,
  or Hertz (Hz). 1
• 
  
  1http//www.webopedi
  a.com/TERM/b/bandwidth.html

4
Bandwidth

• Every machine on the internet is connected by a
  cable (usually there are other ways to connect
  computers, but cables are the most common, and
  all connections have and use bandwidth in the
  same way). This cable has a capacity it can
  carry a certain amount of information, sort of
  like a water pipe carries water. At either end of
  this cable, there is some sort of computer which
  can send or receive data at a certain speed.

5
Bandwidth

• The slowest of these three capacities is the
  bandwidth of the line it's the fastest you can
  communicate between the ends. Think of the cable
  as a long tube with someone pouring water into it
  on one end, and someone draining it on the other.
  You can't take out more than was put in, and if
  you put it in too fast the water will spill
  (losing data). 2
• 
  2http//web.ask.com

6
Bandwidth

• In computer networks, bandwidth is often used as
  a synonym for data transfer rate - the amount of
  data that can be carried from one point to
  another in a given time period (usually a
  second).

7
Bandwidth Traffic

• A modem that works at 57,600 bps has twice the
  bandwidth of a modem that works at 28,800 bps. In
  general, a link with a high bandwidth is one that
  may be able to carry enough information to
  sustain the succession of images in a video
  presentation.3

3http//searchnetworking.techtarget.com/sDefinitio
n/02C2Csid7_gci2116342C00.html
8
Bandwidth Traffic

• A very simple analogy to use to understand
  bandwidth and traffic is to think of highways and
  cars. Bandwidth is the number of lanes on the
  highway and traffic is the number of cars on the
  highway.

9
Bandwidth Traffic cont.

• If you are the only car on a highway, you can
  travel very quickly. If you are stuck in the
  middle of rush hour, you may travel very slowly
  since all of the lanes are being used up.

10
Bandwidth Traffic cont.

• If you are the only car on a highway, you can
  travel very quickly. If you are stuck in the
  middle of rush hour, you may travel very slowly
  since all of the lanes are being used up.4
• 4http//internetvibes.net/article-87-.html

11
Bandwidth Interview Info.

• Called made March 22,2005 at 936am
• Spoke to Elizabeth a representative of COMPUSA
  tech repair department.

12
Bandwidth Interview

• What is Bandwidth?
• Elizabeth The rate of speed information travels
  across phone or cable lines.
• How is it used today?
• Elizabeth All information accessed throughout
  the world uses bandwidth. Whether through the
  phone or computer bandwidth has always been used
  in some form to transfer information. Its has
  been around longer than people think.

13
Bandwidth Interview cont.

• How does a person steal bandwidth?
• Elizabeth It is only possible to steal
  bandwidth through wireless connections. ( She
  didnt want to go any further on the subject. She
  encouraged online research, simply for legal
  issues.)
• Are there any solutions to bandwidth theft?
• Elizabeth The best solution is to place
  software firewalls and hardware firewalls on all
  protected documents.

14
Bandwidth Interview cont.2

• What does the future of bandwidth look like?
• Elizabeth Bandwidth will continued to be used
  throughout the information age. If anything there
  will probably be discoveries on ways for it to
  run faster and be even more efficient.
• Will there be any upgrades to replace the need
  for bandwidth in the future?
• Elizabeth Upgrades are definitely possible.
  There always be improvements made to bandwidth,
  but replacing it doesnt seem to be happening any
  time soon. The technology world will always find
  new discoveries and ways to make things better,
  so who knows what may be possible.

15
Bandwidth Uses

• - To calculate bandwidth, you need to considera)
  the size of your pages (or website)b) the number
  of visitors to your websitec) the kind of files
  you offer your visitors.
• - Most personal websites have only a small amount
  of data transfer, as their websites are small in
  file size and they do not have a lot of visitors.
  Business and professional sites are larger with
  more visitors and therefore use more data
  transfer. Some sites may be significantly larger,
  especially if they offer many graphics, audio,
  video or download files.5
• 5http//developers.evrsoft.com/article/webdevelopm
  ent/mobilewirelesscomputing/bandwih-explained.shtm
  l

16
Stealing Bandwidth

• Linking directly to an object on another server
  by any means (again, excluding HTML-type pages)
  is bandwidth stealing, unless that is
  specifically allowed by the terms and conditions
  of the host provider.
• This happens when you include an image, sound,
  movie, zip file or other similar object directly
  in your web pages (note that linking to a web
  page on another site is NOT bandwidth stealing).
  6
• 6http//www.tipz.ne
  t/sins_bandwidth.htm

17
Stealing Bandwidth

• You can also think of bandwidth similar to the
  electricity your refrigerator takes to run. When
  someone links directly to an image on someone
  else's server instead of copying it to their own
  computer and then uploading it to their own
  server, it is similar to your neighbor running a
  cord over to your outlet to run his own
  refrigerator. While it is convenient for him, it
  is the person that has the plug-in that has to
  pay for the extra usage.7

18
Stealing Bandwidth cont.

• There are many servers that set a limit to the
  amount of bandwidth a site may use each month and
  after that limit is reached,  a site may be
  closed and the webmaster sent a large bill that
  must be paid before they can open their site
  again. Some artists can not afford this and may
  be forced to closed permanently. If you really
  admire the artist's who's work you are using help
  them keep their sites open by not stealing their
  bandwidth.7

19
There are some very simple steps that you can
take to unsure that you are not stealing someone
else's bandwidth.

• 1.) Always copy the images you want to use to
  your own computer, and them upload them to the
  directory on your own site. 

To copy an image using a PC. Hold your mouse over
the image you want to copy and click the right
mouse button. When the drop down menu appears
select Save As and you will be given another menu
so you can select the file name and location of
where you want to save the image. On A Mac, hold
down the right mouse button and follow a similar
route. 7
20
Avoid Bandwidth Theft

• 2.) Make sure that the image is being loaded from
  your own directory instead of the site where you
  original got it.

If the image you want to load is in the same
directory as the page you want to display it on,
the HTML code is simply ltimg src"the path, name
an extension of the image"gt Example ltimg
srcroundball.gifgt
Note your code should never look like
ltimgsrc"http//www.someone_else'sserver.com/arti
stsdirectory/nameofimage.gif"gt 7
7http//cstern.sphosting.com/csdesigns/linking.htm
l
21
Bibliography
1.http//www.webopedia.com/TERM/b/bandwidth.html


2. http//web.ask.com

3.http//searchnetworking.techtarget
.com/sDefinition/02C2Csid7_gci
2116342C00.html
4.http//internetvibes.net/article-87-.html
5. http//developers.evrsoft.com/article/web-devel
opment/mobile-wireless- computing/bandwidth-exp
lained.shtml
6. http//www.tipz.net/sins_bandwidth.htm
7. http//cstern.sphosting.com/csdesigns/linking.h
tml