Testing BNC, RJ45, RJ11 for commun

Ok, Im trying to test if this connection would work hypothetically. I have a bnc that connect into a Forvus cut card. The BNC in getting signal from a telephone cable rj11. Can communication travel from and rj45 line to and rj11 line?

You understand that they are diferent sizes, right ?
see...http://www.dgahouston.com/rjplug.htm