An apparatus for common mode suppression comprising: differential signal lines (110, 112, 142, 144), including an upper signal line (110, 142) and a lower signal line (112, 144), for carrying differential signals from a sending side of the differential signal lines (110, 112) to a receiving side of the differential signal lines (142, 144); a common-mode suppression circuit in the receiving side including a transformer configured and arranged with a primary-side inductor arrangement and a secondary-side inductor arrangement, with the primary-side inductor arrangement having an upper coil having a first end coupled to the upper signal line and a second end coupled to a reference ground voltage; and having a lower coil having a first end coupled to the lower signal line and a second end coupled to the reference ground voltage, and with the secondary-side inductor arrangement having an upper coil with one terminal electrically connected to the upper signal line and another terminal crossing to electrically connect to the lower signal line and having a lower coil with one terminal electrically connected to the lower signal line and another terminal crossing to electrically connect to the upper signal line; and a signal combining circuit, responsive to the common-mode suppression circuit, for combining, by adding the opposite phases, the differential signals as carried on the receiving side of the differential signal lines (142, 144). differential signal lines (110, 112, 142, 144), including an upper signal line (110, 142) and a lower signal line (112, 144), for carrying differential signals from a sending side of the differential signal lines (110, 112) to a receiving side of the differential signal lines (142, 144); a common-mode suppression circuit in the receiving side including a transformer configured and arranged with a primary-side inductor arrangement and a secondary-side inductor arrangement, with the primary-side inductor arrangement having an upper coil having a first end coupled to the upper signal line and a second end coupled to a reference ground voltage; and having a lower coil having a first end coupled to the lower signal line and a second end coupled to the reference ground voltage, and with the secondary-side inductor arrangement having an upper coil with one terminal electrically connected to the upper signal line and another terminal crossing to electrically connect to the lower signal line and having a lower coil with one terminal electrically connected to the lower signal line and another terminal crossing to electrically connect to the upper signal line; and a signal combining circuit, responsive to the common-mode suppression circuit, for combining, by adding the opposite phases, the differential signals as carried on the receiving side of the differential signal lines (142, 144). the primary-side inductor arrangement having an upper coil having a first end coupled to the upper signal line and a second end coupled to a reference ground voltage; and having a lower coil having a first end coupled to the lower signal line and a second end coupled to the reference ground voltage, and with the secondary-side inductor arrangement having an upper coil with one terminal electrically connected to the upper signal line and another terminal crossing to electrically connect to the lower signal line and having a lower coil with one terminal electrically connected to the lower signal line and another terminal crossing to electrically connect to the upper signal line; and a signal combining circuit, responsive to the common-mode suppression circuit, for combining, by adding the opposite phases, the differential signals as carried on the receiving side of the differential signal lines (142, 144).