1) One IP connection via a T-1. Second IP connection via GRE tunnel carried on first.
2) One IP connection via a T-1 that doesn't have transit, only peering with providers B and C. IP connections via two GRE tunnels to providers B and C.
3) One IP connection via MPLS over T-1. Second IP connection via different MPLS virtual circuit over the same T-1.
4) One IP connection via Frame Relay over T-1. Second IP connection via Frame Relay over the same T-1.
5) One IP connection via a T-1. Second IP connection via a different T-1 that is multiplexed on the same DS3.
6) One IP connection via a T-1. Second IP connection via a different T-1 that is on separate physical pairs, but in the same cable bundle.
you left out one connection via a chevy full of hollerith cards and the second a canoe full of 7 track tape in waterproof containers. we now return you to the real internet, where we invent new usefull things occasionally but try to refrain from redefining well-understood terms on a daily basis (unless we are in marketing). randy