Type A (straight-through): MPO patch cord has the same core arrangement at both ends, i.e. 1 at one end corresponds to 1 at the other end, 12 at one end corresponds to 12 at the other end, and the key up at both ends faces the opposite direction, key up corresponds to key down.
Type B (interleaved): The cores at both ends of the jumper are arranged in opposite positions, i.e. 1 at one end corresponds to 12 at the other end, and 12 at one end corresponds to 1 at the other end. The key orientation at both ends is the same, i.e. key up corresponds to key up, and key down corresponds to key down.
Type C (pair interleaved): MPO patch cord of type C is a pair of adjacent cores crossed, i.e. core 1 at one end corresponds to 2 at the other end, and core 12 at one end corresponds to 11 at the other end. key up corresponds to key down.
The three polarization methods use different types of MPO backbone cables for different polarization methods. The TIA standard also defines two different types of LC or SC duplex fiber patch cords to complete the end-to-end duplex connection: A-A (crossover) patch cords and A-B (straight-through) patch cords.
Compared with other fiber optic connectors, MPO connectors have the characteristics of small size, high precision and high density, and its appearance has greatly improved the popularity of optical networks and reduced production costs. Therefore, MPO patch cord is widely used in the wiring process requires high-density integrated fiber optic line environment, such as FTTX and 40/100GSFP, SFP+ and other transceiver modules or equipment inside and outside the connection applications.
