kujina

Hello members I need to convert the RJ11 ends of four Bosch cameras (from a Bosch eazeo system) to work on a new DVR with BNC inputs. The Specs of the Bosch VCM7D130/00T Cameras are: Connection TP 4-pole RJ11E - 4-wire dual twisted pair (Video, Audio, Power, Comm.) Input Voltage 24 VDC Power Consumption < 2 W I believe the wiring is as follows (the power and ground are definitely correct, I tested with multimeter) http://www.instructables.com/files/deriv/FC5/C0CG/GA1BSSQ1/FC5C0CGGA1BSSQ1.LARGE.jpg I made a converter (tried video on both remaining wires) but it didn't work, am I correct in thinking its because I need a to use a Balun? I think this might Work! If I chop off the RJ11 connectors on the DVR end of the camera cables and fit RJ45 connectors and then buy these it should work right?

Thanks for the replys! The wiring diagram picture isnt mine its from Instructables.com, I didnt actually notice the colours of the wires but rather the pin assignments, and the position for power and common/ground is the same as in the diagram The cameras are definitely in working order because they are still connected to the original surveillance system and I measured (using a multimeter) the voltage from an rj11 input jack on the back of that unit, therefore the pin assignments for Power & common/ground is know to me and the voltage of 24 Vdc is confirmed also. I didnt get any picture at all when trying my previous converter on the new Avtech DVR and I tried both remaining wires, one of which must be audio and must be video. As far as baluns goes it does seem I need them (on DVR end) as I read a couple of threads on forums just before making this thread, one is here Also on wiki in regards to Baluns, UTP cable and video it says "A balun is also used on the video recorder end to convert back from the 100-ohm balanced to 75-ohm unbalanced."