cat3 is fine for voice circuits. I see alot of commercial LV contractors still using cat3 for voice since its a little more compact and they can cram a few more in the conduit. Its also faster to work with when terminating it at blocks since the pairs dont have to be untwisted like cat5
FCC has a minimum standard for premise wiring which requires at least cat3. The old school quad with no twisted pairs is out, yet i still see some tract builders letting their alarm guys install the stuff :roll:
Cat5E is all that is needed for data. Cat6 is useless, and i cant figure out why they even make the stuff. There is NO data standard which requires cat6 and the stuff is a pain to work with. gigabit specs CAT5E, and 10-gig over copper requires CAT6-A which is a whole different beast than Cat6.
If you have any questions on Cat3 Cable for Communication Networks. We will give the professional answers to your questions.