T&N includes circuit noise, current, power influence, and loss testing, which the 7B does not include. Those would be used mostly for POTS circuits. Dry loops, those tests aren't used.

Edit: forgot the most important test, COIL test! to find load coils when the LEC technician swears you aren't on a loaded pair and have to go to a vendor meet to prove yes it is a loaded pair.

Last edited by hawk82; 01/24/16 07:43 PM.