| A bandwidth test is a
program that sends one or more files of known size over a network to a
distant computer and measures the time required for the files to
successfully download at the destination, and thereby obtains a theoretical
figure for the data speed between two or more points, usually in Kbps (Kilo
Bits Per Second) or Mbps (Mega Bits Per Second).
Bandwidth test results vary greatly and several
factors that affect test results include:
- Internet traffic (speed generally decreases as
volume increases)
- Variable propagation delays (can artificially
inflate or degrade the result)
- Noise on data lines (has a real detrimental effect)
- The sizes of files used for the test
- The number of files used for the test
- The demand load on the test server at time of test
- Geomagnetic and/or thunderstorm activity
In order to get a reasonable estimate of bandwidth
(sometimes referred to as throughput), experts suggest that three or more
different test sites be used, and that each test be conducted six times at
each site. Then the top and bottom 1/3 of the figures should be disregarded.
Finally, the middle 1/3 of the results should be averaged |