Centrální napájení u multiswitchových instalací. Moderní multiswitchové instalace by měly být napájeny z hlavního zdroje elektrického napájení. This approach helps to build the installation, because one does not need to supply AC voltage (230 VAC in Europe) to each box in which there is a multiswitch. Reputable manufacturers of multiswitches take into account this type of power supply in their products. In the case of TERRA, MSV-5xx multiswitches are centrally powered from the power supply integrated with SA-501 amplifier (
R70501), whereas MSV-9xx multiswitches take power from SA-901 amplifier (
R70901). In both cases the power is supplied through H lines. Building an installation based on MSV multiswitches, it is necessary to balance the power requirements with maximum current capacity of the supplying device/s. For example, using SA-901 amplifier with max current of 2 A, with two LNBs consuming 2x300 mA there is 1.4 A left for the rest of the installation (2 A - 2*0.3 A = 1.4 A), so the SA-901 device can power up to 14 MSV multiswitches (each consuming about 100 mA).