[headdie]

Considering there's a need for "gate farms", I'd say they're paired.

It depends on the capacity of a gate, I imagine much like with nodes there is a limit to how much can be in transit through a gate at any one time.  in this case a "Gate Farm" acts more as a mass transit point like a motorway/autobahn compared to a single gate which operates like a regular road.

But seeing a pared gates is the popular theme for such devices they probably are.

[-Norbert-]

Just because it's popular, doesn't mean it's a fact. There are good arguments for either stand point (though the paired theory seems to have more of them).
Either way I'd rather wait for some "official" comment.

[Trivial Psychic]

Perhaps the gate pairing employs Quantum Entanglement as a means of maintaining a real-time data link between both ends of the gate to ensure 100% accurate info on the gravitational environment at the other end, and control both ends of the jump at the same time for ships without or not using their drive systems.

[Trivial Psychic]

4 days and no further comments.  I guess my explanation has seemed the most plausible. 

[MatthTheGeek]

I think we're just ok with the technobabbling.