View Full Version : Question.
06-17-2003, 12:51 PM
Hi to all,
What i wanted to know was that a telephone wire carries data upto 22.8KBPS......... So how can a modem transfer data at around 56KBPS.??
Is it because a telephone wire is after all copper and hence has the ability to transfer at higher speeds?? Thanx in advance.
06-17-2003, 01:18 PM
Think your getting the wrong end of the stick mate...
Voice data and Computer data are completly different things. All a a modem does is act as a converter of the data that comes into the PC. A telephone does the same but for voice data. 2 different things mean two different bit rates.
06-17-2003, 03:24 PM
As newer technologise are designed newer modems come with better compression ie 28.8Kbps, 33.6Kbps, 56Kbps. (Note its bits "b" not bytes "B".
06-17-2003, 10:25 PM
My telephone wire is carrying DSL (very fast) service and I can use the phone at the same time. The limitation is not with the line, it is set by the phone companies and limited by the technology they are using to move the data.
06-18-2003, 09:13 AM
Well, as hinted at by others,it because modems use different frequency modulation methods to place more data into a "3,000 hertz" phone line. Modem "speed" is really just a function of the type of frequency modulation being used,a phone line can support more then the 3,000 Hertz speed used for voice communications (old modems used the bandwidth assigned to voice communications, but DSL is not limited to the "3,000 Hertz" voice line speed, which is why you can talk on the phone and download files at the same time using a DSL or ISDN line).
56K modems really work at slower speeds then 56k and those speeds are different (asymmetric) depending on which way the data is flowing. Most home data connections over phone lines, including DSL, work at asymmetric speeds.
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