FibreIRS GTU Quad FibreIRS GTU Quad The NEW Quad FibreIRS gateway termination unit (GTU) has been designed to replicate a quad LNB within a home that is fed by a fibre passive optical network (PON). Also, combining DTT & DAB it provides the homeowner with 4 coaxial satellite universal outputs and one coaxial digital terrestrial output.4 x Full IF + 1 X Terrestrial, Suitable For Indoor Use Only