Type A (straight-through): The cores at both ends of the jumper are arranged in the same position, that is, 1 at one end corresponds to 1 at the other end, and 12 at one end corresponds to 12 at the other end. The orientation of the key keys on both ends is opposite, and key up corresponds to key down.
Type B (interleaved): The arrangement of the cores at both ends of the jumper is reversed, that is, 1 at one end corresponds to 12 at the other end, and 12 at one end corresponds to 1 at the other end. The orientation of the key on both ends is the same, that is, key up corresponds to key up, and key down corresponds to key down.
Type C (paired interleaved): C-type MPO jumper is a pair of adjacent core positions crossing, that is, the core 1 at one end corresponds to 2 at the other end, and the core 12 at one end is 11 at the other end. The orientation of the key keys on both ends is also opposite, key up corresponds to key down.
Three polar connection methods Different polar methods use different types of MPO backbone optical cables.
However, all methods must use duplex jumpers to form fiber links. The TIA standard also defines two different types of LC or SC duplex fiber jumpers to complete end-to-end duplex connections: A-A (cross-over) jumpers and A-B (straight-through) jumpers.
