I installed a new derailleur (Deore) and I'm having a problem aligning it. When I move the mech without the cable, the gears shift perfectly, but when I attach the cable, there's a problem. When shifting towards the highest gear, the second-highest gear is omitted. When I switch to that gear, the chain just stays on the third-highest gear, and shifts to the highest gear when I go on with the shifting. When going downwards in gears, there's no such problem.
So the question is, once the limit screws are set properly, how do I adjust the cable tension?