Differences between version 5 and predecessor to the previous major change of BroadBand.
Other diffs: Previous Revision, Previous Author, or view the Annotated Edit History
| Newer page: | version 5 | Last edited on Sunday, August 17, 2003 4:06:48 am | by AristotlePagaltzis | Revert |
| Older page: | version 4 | Last edited on Saturday, August 16, 2003 4:10:42 pm | by zcat(1) | Revert |
@@ -1,24 +1,11 @@
-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
+You could even argue that POTS is already broadband since it uses loop current to signal when the line is in use..
-----
-(From old Broadband node)
-A nice fast connection
to the [Internet], for some reason defined as 128kb by
[TelecomNZ].
+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
.
-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.
+See also Dictionary:Broadband
-----
-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.
-
-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.
-
-
-
-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
