Well why not put a fully armed and armoured instalation some 10 km away from the node (this providing the instalation has some realy big guns i mean a range of some 15 km and a masive damage...it only needs to have 5 or 6 of these things pointed twords the node with some aditional remote controled beamcannons...with theyr own close range AAAf turrets..(a maxim and a shuiled destroyng weapon as part of a turret..).
The instalation will have its own fighter/bommber bay..with lets say 400 craft..kept there at all times(lets not repeat the whole Colossus incident when the big mtf had no aicraft on board at all..therefore no aditional firepower..). and lets say a friggate or 2 corvettes patroling the area at all time...of course this depends on the importance of the sistem..!
If the sistem is very important then lest bring in a couple of Orions or even 2 Hecates..(the Orions can realy take a beating..cant they...

).
And if the sistem was the most important or crucialy important like the nebula or some other Important sistem then y would station a mine filed in front of the node..and lets say some 600 bommbers and fighters/interceptors..on the instalation...with lets say 2 Destroyers and a couple of corvettes..:thepimp:
now that is i believe a well defended node....not even the Sathany fleet woludnt have it easier...with the first of these behemonts getting opumbled into oblivion by all these beam cannons from all around it not to metion the bommbers..and fighters..!;7
Of course you must have an early warning sistem..and why not mine the jump node itself..!