So this is something which has always confused me, which interface to choose when connecting to a ISDN30 being used for voice and what the difference is. Here is the information I've picked up from researching this:
PRI ISDN is a service which operates on top of an E1 circuit.
VWIC3-1MFT-G703 vs VWIC3-1MFT-T1/E1
The difference here is essentially if you want framed or unframed E1.
Unframed (G.703) allows you to use the full bandwidth of the circuit (2048kbps), this mode is not often given and is more costly.
Framed E1 gives you 1984kbps bandwidth because timeslot 0 is reserved for signalling and sync
The E1 connector is either 2 pairs (RX and TX) on a single RJ48 interface or 2 x BNC coax.
Sources:
http://www.farsite.com/cable_standards/G.703_E1_ANSI_T1.403_T1.shtml
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