kat5 alternative for Americans?

["Rehan Khwaja" <rehankhwaja@xxxxxxx>]

Well, KAT5 isn't available for the States so I found some
alternatives, which generally look like this:

http://www.tselectronic.com/viewpage.php?
refpage=/dss_ht/dssindex.html&refscope=ecatalog&filename=unicom/vaau50
1.html

and this:

http://www.unicomlink.com/wiring/ava.html

Now, one of the things that I notice about these units is that they
don't have a power supply.  Why is this and what does it mean for the
quality of transmission?  Does it imply that it's not using balanced
lines?

Thanks for any help,
Rehan