DISEqC for mixing several LNB's
DiSEqC switches are ultimately mixers satellite signal with some intelligence. It really does not make a mixture but Realica switching. The satellite receiver can be ordered in a given satellite channel A moment, and the switch coaxial cable sent by the satellite signal A, and another time when changing channels the user can request satellite channels and switch B He sent down the cable TV signal B.
Switches have to mix two, four and up to eight LNB. The output of diseqc recommend is a cable that directly reaches the satellite receiver.
The most common case is to have aimed at a satellite and use a multifocus support to put an extra LNB signal and to have two satellites with a single dish satellite dish, mix these signals with diseqc and put in the cable that already had as did the receiver.