Tim - it is a special cord - it does have an RJ45 jack at one end - but the other end is for the DTE port on the 3160. You can probably order them directly from Paradyne - or google the DTE cord. I know the 3160 manual - which you can also google - has the specific cord number listed.
Tom Daugirdas,
President
STCG, Inc.
stcg.com