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Differences between current version and predecessor to the previous major change of BroadBand.

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Newer page: version 6 Last edited on Sunday, August 17, 2003 12:58:42 pm by zcat(1)
Older page: version 4 Last edited on Saturday, August 16, 2003 4:10:42 pm by zcat(1) Revert
@@ -1,24 +1,13 @@
-A Frequency Division Multiplex'd communications channel. 
+A frequency division multiplexed communications channel, ie one that uses different parts of the frequency spectrum for different signals
  
-See also Dictionary:Broadband  
+Normal phone service uses approximately 300Hz-3.2KHz for voice signal, 75V at 20Hz for ringing, and a DC loop current to signal on/offhook and supply a small amount of power to subscriber equipment. However, a pair of copper wires can carry frequencies far above 4KHz. [ADSL] exploits this extra [Analog] BandWidth to carry analog-encoded data between the subscriber and telco without interfering with normal phone service.  
  
-Compare BaseBand  
+U.S.Robotics also has a good description of [how ADSL works|http://www.usr.com/education/bb2.asp]  
+and a glossary of [broadband related terms|http://www.usr.com/education/broadbandglossary.asp]  
  
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-(From old Broadband node)  
-A nice fast connection to the [Internet], for some reason defined as 128kb by [TelecomNZ].  
  
-Technically BroadBand means that the signals are converted to analog then transmitted then converted back to digital signals at the other end . BaseBand is defined as signals being transmitted digitally. The technical definition has no limits on speed. A "56k modem" would be BroadBand while [10BaseT ] is BaseBand. Of course this has somehow been corrupted by general use, so everyone thinks "!BroadBand" means > 128k. People are weird
+The term has long become synonymous with fast, high-bandwidth networking, regardless of the means to achieve it . [TelecomNZ ] uses it to describe 128k connections
  
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-Sorry to nitpick, but most of the references I've seen (Network Engineering stuff, the dictionary link above, [WikiPedia|http ://www.wikipedia.org/wiki/ Broadband], etc..) say that broadband refers to using different parts of the frequency spectrum for different signals.  
+See also Dictionary :Broadband 
  
-They also acknowledge that BroadBand has become synonymous with fast, high-bandwidth networking.  
-  
-Normal phone service uses approximately 300Hz-3.2KHz for voice signal, 75V at 20Hz for ringing, and a DC loop current to signal on/offhook and supply a small amount of power to subscriber equipment.  
-  
-A pair of copper wires, however, can carry frequencies far above 4KHz. ADSL uses this extra Analog BandWidth to carry analog-encoded data between the subscriber and teleco without interfering with normal phone service.  
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-You could argue that POTS is already broadband since it uses loop current to signal when the line is in use.. but that's really stretching the definition.  
+Compare BaseBand