Clarified a lot, but still have a question:
What is the physical difference between a RJ12 & RJ14 socket? They
No physical difference
both are 6 positions and 4 pins, do the pin positions differ?
No - they look identical but what the pins connect to differs.
Remember that this RJxx definition does not just define the physical
characteristics of the jack. It's what the jack is connected to that
defines its RJ number as well.
RJ12 6p4c single T/R line, with A/A1 for 1A2 lamp control (PBX)
RJ14 6p4c two independent T/R lines
OK - Guessing - you got confused by a misleading statement from the
guide above:
"For example and RJ12 and RJ14 both use the same jack, but are wired the
same."
I think it is some cut-n-paste error. They are not wired the same.
Both RJ12 & RJ14 jacks are 6p4c jacks. The RJ14 contains two phone
lines (a total of 4 conductors) & the RJ12 has one phone line &
conductors for the A & A1 lamp control of a PBX (also a total of 4
conductors).
Kim