[MLB-WIRELESS] adsl protocol question... - off topic

[Gabrielle Harrison & Paul van den Bergen]

Hi all,

<mode = de-lurk>
does anyone know how the signalling and data transmittion codecs work for  
adsl cable and satellite?

e.g.
The line b/w your house and the exchange is capable of telephone at low  
frequencies and adsl at high frequencies.  Depending on your adsl plan you  
get a feed that is somewhat lower in speed than the maximum... which I  
presume is somewhere around 1.5 Mbps??? (ignoring local conditions and  
distance to exhchange effects - I'm interested in the max possible output  
 from the exchange.)

most of us get much less than the 1.5 Mbps.  so how is that achieved. Is  
it something like a limited frequency band that is used, such that there  
is, for want of a better term, some dark cable available for another  
transmitter to access, or is it a codec change... e.g. lower speed, more  
error checking, greater distance, but still using all the available  
frequency band (or more likely, using all the frequency band,  
inefficiently, but not so as one can share).

basically I want to know if 2 service providers can utilise the copper  
pair coming ot your home...



-- 
   ########## Paul van den Bergen,
#  #       # & Anja van den Bergen
####  #    # Glen Waverley VIC 3150 Australia
   #   ###### gabpaul at melbpc.org.au
   #   #      ph: +613 9886 3160
   #####      mob: 042 886 3160

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