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					Originally Posted by  fishstix
					 
				 
				You are correct in your theory.   
 
If in doubt find your demarc on the side of the house and open it up (demarc = demarcation point for the phone company).  It usually is labeled "phone company" or something of the like.  You should see your feed cables coming in and tied down to a block.  I would take a look at it now and then look at it later.  That should shed some insight as to what pair the installer used to feed the house. 
 
I can also add - sometimes the cable that runs to all your jacks get wired in series.  Somebody opens a jack up and forgets to tie down "line 2 wires" and the circuit is broken.  If you happen to know the first jack from the cabling outside - I would start with that one and move throughout the house. 
			
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 Do the data lines (green/white white/green) need to be connected to line 2 through out the house or can they just remain intact and not hooked up to line 2 to complete the circuit? Does that make sense?