imported>(logged).reverse.qsc.de No edit summary |
No edit summary |
||
| Line 76: | Line 76: | ||
T-3 |
T-3 |
||
A leased-line connection capable of carrying data at 44,736,000 bits-per-second. This is more than enough to do full-screen, full-motionvideo. |
A leased-line connection capable of carrying data at 44,736,000 bits-per-second. This is more than enough to do full-screen, full-motionvideo. |
||
[[Category:Computer]] |
|||
[[Category:Networking]] |
|||
Revision as of 20:41, 19 February 2005
Bandwidth How much stuff you can send through a connection. Usually measured in bits-per-second. A full page of English text is about 16,000 bits. A fast modem can move about 57,000 bits in one second. Full-motion full-screen video would require roughly 10,000,000 bits-per-second, depending on compression. See also: Bit, bps, T-1
http://bandwidthplace.com/speedtest/
bandwidth: : "A cumbersome synonym for 'time,' as in, 'I don't have the bandwidth to deal with that with that issue,' but with implications beyond the merely temporal, encompassing the larger issue of mental resources or capacity." from Micojargon in the Thursday "Circuits" section of the New York Times.
Bandwidth: The maximum amount of data that can travel a communications path in a given time, usually measured in seconds. If you think of the communications path as a pipe, then bandwidth represents the width of the pipe that determines how much data can flow through it all at once.
Bandwidth
(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).
The bandwidth is particularly important for I/O devices. For example, a fast disk drive can be hampered by a bus with a low bandwidth. This is the main reason that new buses, such as AGP, have been developed for the PC.
http://www.webopedia.com/TERM/B/bandwidth.html
(analog) Modem : < 28.8 Kbps to 56 Kbps
ISDN : 64 Kbps to 128 Kbps
Sattelite: ~ 400 Kbps
(A)DSL: (theoretically up to 9 Mbps ,but ..) 768 to 2048 Kbps (usually less in upstream)
Cable (Modem): up to 10 Mbps
T1-Line: 1544 Kbps (1.544 Mbps)
T3-Line: 44736 Kbps (44.736 Mbps)
<html>
| 28.8 Modem | 28.8 Kbps | <img src="http://fcit.usf.edu/distance/pics/dot.gif" width="1" height="10"> |
| ISDN | 128 Kbps | <img src="http://fcit.usf.edu/distance/pics/dot.gif" WIDTH=3 HEIGHT=10> |
| Satellite | 400 Kbps | <img src="http://fcit.usf.edu/distance/pics/dot.gif" WIDTH=8 HEIGHT=10> |
| T1 | 1.5 Mbps | <img src="http://fcit.usf.edu/distance/pics/dot.gif" WIDTH=30 HEIGHT=10> |
| ADSL | 9 Mbps | <img src="http://fcit.usf.edu/distance/pics/dot.gif" WIDTH=180 HEIGHT=10> |
| Cable Modem | 10 Mbps | <img src="http://fcit.usf.edu/distance/pics/dot.gif" WIDTH=200 HEIGHT=10> |
</html>
T-1
A leased-line connection capable of carrying data at 1,544,000 bits-per-second. At maximum theoretical capacity, a T-1 line could move a megabyte in less than 10 seconds. That is still not fast enough for full-screen, full-motion video, for which you need at least 10,000,000 bits-per-second. T-1 lines are commonly used to connect large LANs to theInternet.
T-3 A leased-line connection capable of carrying data at 44,736,000 bits-per-second. This is more than enough to do full-screen, full-motionvideo.