Here are a few pics of eircom (formerly Telecom Eireann) sockets &
fittings.
Eircom ADSL / Phone Master Socket (New):
Eircom ADSL / Phone Master Socket (New) (RJ11 both sides):
Interior of Eircom New-type Master socket (ADSL splitter module part of
front panel):
Front panel, including ADSL splitter:
Original Telecom Eireann / Eircom master socket used for the past 20+
years. RJ 11 outlet (6 terminal):
Inside original Eircom/Telecom Eireann master socket:
Theoretically, they should be wired like so:
Incoming 2 wire L1 & L2 (no R)--- socket 1 ---- outputting L1, R, L2
--- socket 2 -- outputting L1, R, L2 and so on..
There is no "slave" version all sockets contain the capacitor and line
test circuits.
However, in many installations the sockets were simply run radially
from a junction box each operating independently.. especially where DIY
was involved. Unlike BT, Telecom Eireann / Eircom does not have any ownership of the cabling within your home. It terminates its network on a final junction box which contains equipment designed to protect the
network (fusing etc).
Manufactured by Siemens / Rutenbeck (Ireland)
These are still installed where DSL is not required.