MF>-> I would suggest Category 3 UTP (Unshielded Twisted Pair).  I just
MF>-> had some new phone lines put in, and thats what they used to bring
MF>-> it into the house. Cat 3 should be more than adequate for
MF>Would having a shielded twisted pair yield better performance, less
MF>errors, or would it not make much of a difference?  What is the
MF>difference between Cat 3 and 5?
Basically the difference between the Cat "x" is the amount of twists per 
foot(there's more to the specs if you REALLY want to know).  The more 
twists, the higher the noise rejection of the cable. Cat 3 is adequate 
for 10mps Ethernet, while Cat 5 is required for 100mps Ethernet.  
Shielding will attenuate the the signal when used in a high speed 
network, that's why you use UTP.  In a phone application you could used 
a shielded cable, but only if it's properly grounded.  I wouldn't 
recommend it due to the added cost.  It's easy enough to avoid noisy 
things in a house.  Try to route your cables away from electric motors, 
fluorescent lights, speakers etc.
Also try to keep the polarity correct, Check my "Tip & Ring Question" 
post for information.
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