I'm still trying to clear up the ins and outs of this in my mind, and I'm wondering if you all can help me make sense of all the fragments of info I've gleaned.1) Does modern UK POTS equipment *require* the bell shunt wire, or will most work without?
2) I see that for standard analogue phones, they are a generally a three-wire system, that may also use an earth line. When is this earth line used and how common is it?3) Apart from the extra pair of wires on the outer pins, are PBX extensions compatible with standard extensions? Can you plug a standard handset into a PBX extension socket?
RJ-45 to BT-431/631 converters:4) I read that there are three types, although the terminology seems flexible. The secondary/slave type is the most obvious, and I've worked out how those are wired. When would you use this type?
5) There also seems to be a standard master type. I imagine internally that this takes the A and B lines (on the blue pair in the Cat5) and contains the surge protector, test resistor and bell capacitor to provide the third bell wire. Is this correct? When would you use this?6) What is the third type?
7) The secondary/slave adapter that I examined disagrees with the wiring on the above page. Mine has earth (4 on the BT socket) going to 2 on the RJ-45, whereas his has it going to 1. Which is correct, or are there different way to do it?8) I have an incoming standard analogue line with a BT socket and I need to route it via the structured cabling.
Should I do:
(A) BT #5 -> RJ45 #5 (B) BT #2 -> RJ45 #4
And put a master adaptor at the remote end? Will it matter having two master sockets as it were, wired to the same line, e.g. in terms of the impedance viewed from the other end and the test resistor?
Or should I do as above plus:
(bell) BT #3 -> RJ45 #1
and use a secondary adaptor at the other end?
Sorry for all the questions! Hopefully someone can help me with some of them.