RS> Hey, I need help with the basics, what are the yellow and black for
 RS> anyway?  They not connected.
Spare set in case of a break, or second line.  I think in the days of party 
telephones they were connected, and had a different function.
 RS> My line's quiet (from the stand point of listening to it with the ear
 RS> and not putting a spectrum analyser or other test instrument on it.
If you don't have any audible hum or noise, it's probably ok.  The crosstalk 
problem is if you're using yellow/black for a different line, and 
conversation from one line "bleeds over" onto the other.
-Dave
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