A number of different variations exist for this connector series. The FX10 is available in 4mm and 5mm mated heights and comes in 80, 100, 120, and 140 contact positions. The FX11 has mated heights for 2mm, 2.5mm, and 3mm applications requiring 60, 80, 100 or 120 contact positions. Again, the signal-to-ground contacts are arranged in a 10:1 ratio. A connector with “120/12” in the part number indicates 120 signal contacts with 12 ground contacts.