I want to connect my home phone line network to my ISP box and my ISP box directly to the France Telecom line using twisted pair cable.
Initially, room 1 was connected directly to the FT line, so I disconnected it in the FT box, connected the two wires coming from the room and the two wires from the FT line to the twisted pair cable. At the other end, I connected two phones socket, where I plugged the ISP box.
Now it looks like this:
The problem is that since I did that, my noise margin dropped from 7,2dB to 5dB, CRC errors started to appear, and the download bandwidth dropped from 7,8Mbps to 5,8Mbps. If I disconnect the phone from the ISP box, it's back to normal. Also, using a phone filter on the phone socket connected to the ISP box improves the bandwidth up to 6,8Mbps.
I think there's some interferences between the phone and the ADSL line. How do I solve that?
I'm using cat6a FTP cable, do I need to connect the shielding to the ground?
Do the two wires from the phone line have to be connected on the same pair or separate pairs? Is their a norm on connecting those? (like ADSL on blue/whiteblue wires and phone on green/whitegreen wires for example)
Would I need to have two separate cables for the ADSL and phone?