UK Telephone <-> Structured wiring

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?
http://web.ukonline.co.uk/freshwater/rj45.htm suggests that it is a
"PABX master".

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.
.

Relevant Pages

  • Re: Charge for moving master socket
    ... BT never keep records of where master ... the call-out charge - I charge a minimum fee for my services too. ... All I want BT to do is move the master socket from ... I can do the extension wiring myself - in fact the house ...
    (uk.telecom.broadband)
  • Re: Bt Extensions
    ... it is and installing a new BT master socket in the new location ... Don't run any voice extensions off the old BT master socket, ... since these will be before the filter. ...
    (uk.telecom)
  • Re: BT line - phone doesnt ring - everything else ok.
    ... The customer then has an extension socket that works ... The look of surprise when you unearth the master socket and charge the ... not relevant and would not move the bookcase to check. ...
    (uk.telecom)
  • Re: Can someone explain master socket for me?
    ... customer wasn't aware of it & the burglar alarm company stated ... The main phone socket (the ... your master socket to the master alarm ... just be careful not to pull the wires out of their connectors, ...
    (uk.telecom.broadband)
  • Re: Can someone explain master socket for me?
    ... customer wasn't aware of it & the burglar alarm company stated ... The main phone socket (the ... your master socket to the master alarm ... just be careful not to pull the wires out of their connectors, ...
    (uk.telecom.broadband)