Warp factor - everybody has a different theory about what's warped. My favourite theory is that they were invented by Professor Photon. 1.1 B5 has no transporters. Star Trek really does addle the mind. 1.3 Tractor beams and jumppoint disruptors have turned up in the B5 universe, but they're still considered a big deal.
Communication apparently involves tachyon relays through hyperspace, which sounds about right.