To ensure that fiber systems work, each fiber must have a transmitter at one end, and a receiver at the other. It’s like data travels along a one way road. It is vital that this type of connection is made. For multi‐fiber arrays using MPO/MTP connectors, the TIA 568 standard provides three methods for configuring systems to ensure that proper connections are made, Methods A, B & C. Each of these methods handle the transition from a transmit position to a receive position in a slightly different manner, and each employs a backbone cable that is constructed in a specific manner. So essentially, there are three different ways to build the road from start to finish.