[ale] Telco Terminology

[Alan Bowman]

 So that I (and possibly others) can better follow the recent thread
regarding xDSL lines, could someone please define the following terms:

CO
SLC
demarc
physical copper line

  And could I also get a definition of, and an explination of the
differences between:
ADSL
SDSL
IDSL

  Maybe I'm the only one on the list who doesn't use these words in
daily conversation, maybe I'm not.  But I'd still like to know what they
mean.  

  Thanks,

...alan
 
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