Re: BT FTTC with HH5 noise margin decreases gradually until drop out
I will try these suggestions tomorrow.
One other thing to note, I noticed earlier that the A terminal on the master socket is connected to incoming blue wire and B terminal is connected to white. This would appear to be the opposite way around from a typical installation. I used a meter to check if the Voltage was correct, indicating that the connections to the BT drop cable wires may also be swicthed. Terminal A was reading -49V relative to terminal B, which I think confirms it is the wrong way around. I also read that most phones and broadband modems will work with either polarity, so this may be unrelated.
Additionally, there is a mains cable running down the wall parallel to the telephone cable connected to the master socket with about 6-8" separation between the wires. Could that cause interference?