I gtoofed on the above message! My question is this: What would happen if we used CAT5e to extend a T1 circuit about 250' from the Outside Smartjack? I have a pending installation which calls for just that. They already have one T1 that is being fed by a section of 4/24 CAT3 UTP(with one POTS line and one ISDN BRI line as well)..........and they have constant problems on it, but it was installed like that some time ago.