-=> Quoting Dave Shiner to All <=-
 DS> I've heard that reversing the polarity on your phone line can cause 
 DS> problems w/high speed connects.  If this is true how can I tell which
 DS> is  tip and which is ring and what pins on the RJ-11 are they supposed
 DS> to  connect to. I have a volt ohm meter to test with. The house I just
 DS> moved  into has a rats nest of phone cables, so I'd line to test for
 DS> polarity  at the jack. 
The red wire is ring and the green is tip.  The ring side has around -48 VDC
and the tip side should have zero VDC.  The phone system uses a positive
ground so the ring has a negative voltage on it.
Ken
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