Technologie :
Smartphones
bandwidth

Bandwidth is the capacity of a wired or wireless network communications link to transmit the maximum amount of data from one point to another over a computer network or internet connection in a given amount of time, usually one second.

Bandwidth is also defined as a range within a band of frequencies or wavelengths.

In other words, the term bandwidth refersto the volume of information per unit of time that a transmission medium (like an internet connection) can handle.

An internet connection with a larger bandwidth can move a set amount of data (say, a video file) much faster than an internet connection with a lower bandwidth.

While bandwidth is traditionally expressed in bits per second (bps), modern network links have greater capacity, which is typically measured in millions of bits per second (megabits per second, or Mbps) or billions of bits per second (gigabits per second, or Gbps).


Bandwidth describes the data transfer rate . Bandwidth is not a measure of network speed, which is a common misconception.

The wireless technology advancement involve , large bandwidth . We go from 2G, 3G and 4G/LTE which is up to 10 times faster than 3G.

LTE stands for Long-Term Evolution . It is a standard for high-speed wireless communication for mobile devices and data terminals. It is 4G technology Génération based on the 2G and 3G technologies.

The theoretical bandwidth (speed) of 4G-LTE is supposed to be 100 Mbps download and 50 Mbps upload But practical itis around 40 Mbps.


Measuring the bandwidth of a device

Here is an example showing the download and the upload bandwidth of a computer:

a) Using AT&T Internet Speed Test :
http://speedtest.att.com/speedtest/

Download Speed: 12.06 Mbps
(1507.5 KB/sec transfer rate)

Upload Speed: 3.97 Mbps
(496.3 KB/sec transfer rate)

Latency: 41 ms

b) Using Bell Internet Speed Test
https://support.bell.ca/Internet/Internet-Speed-Test



The bandwidth is a fixed amount of a streaming information that travel between the internet and the used devise. Adding other download ou upload requests to the network will get just their portion of the full capacity. So the available bandwidth will be split between requests and devices.

N.B. To stream is to transmit or receive (data, especially video and audio material) over the Internet as a steady, continuous flow.

Since there are 8 bits (b) in a byte (B) , we will have 1 MBps = 8 x 1 Mbps . For example 20 MBs and 20 Mbs (note the lowercase b). The first reads as 20 megaBYTES while the second is 20 megaBITS.

The term latency refers to any delay typically incurred in the processing of network data. A low latency network connection is one that experiences small delay times, while a high latency connection suffers from long delays.

When loading a webpage, for example, often we can observe a noticeable delay from the time we enter the address to the time the page begins loading.


What's a brandband ?


The term broadband refers to any type of signal transmission technique, either wired or wireless, that carries two or more different types of data in separate channels.

As it is a brand band, that is a brand bandwidth, it refers then also to any high-speed internet connection.

Brandband is brand bandwidth.