tdip257, the digital extensions (and analogue ones if you have the right cards etc.) are presented on a 25-pair amphenol connector from the CCU to wherever your current extensions are terminated. Usually the installer will terminate them all, but each pair will normally either carry a extension, or perhaps an exchange line or another feature.
You'd normally wire your extensions to suit the termination, either rj11, rj45, lju6 (.uk) or whatever. Personally mine terminate to a patch panel, and jump across to structured wiring, to rj45 sockets and then I just crimp a rj45 on the handset lead with the centre pair being my extension (as 4/5 are unused on standard 100meg network connection, there's no way you can harm either equipment by mis-patching).
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