What is Bandwidth and Throughput?

In the Internet world, especially when we are talking within the scope of internet cafe, bandwidth is a word that is very sensitive. Why? Because the cafe life course of selling bandwidth, even though it was not a major factor but can not be denied service quality cafe customer visits first time is how fast internet access at the cafe, the access speed is of course back again to the definition of bandwidth.
Perhaps there are among us who feel confused about the difference between bandwidth and throughput?

Here we will slightly edit a blog that discusses about the bandwidth and throughput in a more deep, with a simple language translation hopefully the readers can understand the definition of two magic sentences above.

From: http://borix69.wordpress.com/2007/12/22/mengenal-bandwith-dan-throughput/


While in office have been wearing Joko Lelono leased line for internet connection, Joko not figure out why sometimes at certain times to access a free web mail sites like mail.yahoo.com just lose speed than if Joko Lelono wearing ordinary dial-up his house at night. Whereas leased-line that he uses a 64 kbps bandwidth for both upstream to downstream want any. Why is that?
Joko Lelono naturally confused with Internet connection speeds that are inconsistent with dilanggannya bandwidth. Whereas in accordance with leased-line advertising offers that she see, theoretical speed will be faster and more stable than regular dial-up connection. But why a certain moment sometimes slower connection speeds than dialup?

That's because in addition to the concept of bandwidth, there are other concepts that affect the speed of data flow in the network, namely throughput.

Bandwidth
As we know, bandwidth is the most widely used as a measure of the speed of data flow. But whether it is bandwidth, anyway? Bandwidth is a measure of the amount of information that can flow from one place to another within a certain time. Bandwidth can be a good fit for measuring the flow of analog data to any digital data streams. Now the public has become more bandwidth if the word fit to measure the flow of digital data.

Unit used for bandwidth is bits per second or often abbreviated as bps. As we all know that bit or binary digit is a base number that consists of digits 0 and 1. This unit describes how many bits (digits 0 and 1) that can flow from one place to another in every second through a medium.

Bandwidth is a measurement concept that is very important in the network, but this concept has the disadvantage or restriction, no matter how you submit any information to any media used in penghantaran information. This is because of the laws of physics like any technological limitations. This will cause the limit to the length of the media is used, the maximum speed that can be used, like any special treatment to the media to be used.

Here are examples of medium and long table limits the maximum speed of data flow.


While the restriction to the treatment or the way data transmission such as is
delivery in parallel (synchronous), serial (asynchronous), the treatment of specific media such as media which must not be bent (fiber optics), the sender and receiver must deal directly (line of sight), compression of data sent, etc..

Throughput
Apparently the concept of bandwidth is not sufficient to explain the speed of the network and what happens in the network. For this reason the concept appears throughput. Throughput is measured actual bandwidth at any given time in the size of one day using a specific Internet route while it is downloading a file.
How do I measure the bandwidth? And how this relates to throughput? As reviewed above, the bandwidth is the number of bits that can be delivered in one second. Here is the formula of the bandwidth:
bandwidth = Sbits / s

Meanwhile, even though their throughput has units and the same formula with the bandwidth, but the throughput is more on describing the actual bandwidth (actual) at a particular time and under conditions and certain internet network that is used to download a file with a certain size. Here is the formula for comparison with the bandwidth throughput:

download time _ _ _ best = size of file / bandwidth

download time _ _ _ typical = size of file / throughput

With only the use of bandwidth as the benchmark, Joko Lelono regard should be didownloadnya file size 64 kb can be downloaded in time sekedip eye or one second, but after the measure apparently takes four seconds. So if the downloaded file size is 64 kb, whereas the download time is 4 seconds, then the actual bandwidth or can be referred to as the throughput is 64 kb / 4 sec = 16 kbps.

Unfortunately, throughput due to many reasons, sometimes very far from the maximum possible bandwidth of a medium. Some of the factors that determine the bandwidth and throughput are:
• Network appliances
• Type of data transferred
• Network Topology
• Number of network users
• Specification of the client computer / user
• Specification of the server computer
• Induction of electricity and weather
• And other reasons.

Finally, after understanding the concept of the concept of throughput in addition to bandwidth and why it could happen, Joko Lelono can begin to understand what really happened on its network. By understanding these concepts we can begin to take into account the needs of our internet connection speed and connection options are really necessary. Not just because the ads that cast a timeless promise of high bandwidth at low prices.


Have you now understand about the concept of bandwidth and throughput after reading this article, please leave a comment and you enter on this paper. Thanks 4 your attention .. :) Have you now understand about the concept of bandwidth and throughput after reading this article, please leave a comment and you enter on this paper. Thanks 4 your attention .. :)


Source: IlmuKomputer.Com