1. Initially I can get it down to two extensions - one is the link to the burglar alarm and the other is an extension to the study upstairs where the main telephone and the router are both plugged in. This relies on an ADSL microfilter/splitter at the extension socket. This arrangement has to stay in place for a while during work in the hall.
2. In the medium term, the main telephone can move down to the hall and be plugged directly into the master socket. I want to install an ADSL splitter faceplate, so that the extension to the study becomes a dedicated filtered ADSL line.
3. In the longer term, I want to move the router down to the hall to be plugged directly into the master socket. At that point, the study will be served by ethernet lines from the router and I will be down to a single extension from the master socket (for the burglar alarm).
To this end, I have installed cat5e cables from the hall to the study and I intend to use these for the various purposes outlined above. It is the initial stage that I am wondering about. The problem is that I need both extensions to be connected to the unfiltered connection in the master socket. But unless I use cat5e for the burglar alarm connection (which I don't want to assume will be possible as it's out of my control to some extent), as I understand it I can't mix cable types in the same IDC connector. I have seen junction boxes but they only seem to have one set of connectors coming in and one coming out. My thought is to do something like the following:
Connect two (normal, same type) telephone cables into the unfiltered master socket connections. One goes to the burglar alarm, the other is just a short piece to a junction box. I then connect the cat5e to the other side of the JB.
Does this sound reasonable? If so, a follow up question is: where do I put the JB? I am planning to fit a flush mounted back box (as for a standard mains socket) to take the NTE5. Will there be enough room in there? Or do I need another single socket box next to it to house the JB, perhaps with a blank plate on it? This would be a bit of a pain as the JB is only needed in the short term.
In case it helps, I was planning to mount a double socket back box next to the NTE5 anyway, with a modular faceplate for the ethernet sockets. Maybe there would be enough room in here for the JB?
Thanks and sorry for what has turned into a long post.