Keep MTP/MPO Polarity Rules When Building Connection
When fiber patch cords have different polarity schemes and gender, IT staff needs to be very careful when replacing patch cords in the field. Those who don’t understand polarity or are in a rush to get equipment up and running can potentially use the wrong patch cord and impact signal transmission.
Rules for MTP/MPO Cable and Patch Cable Connection
Where there are A-to-A type patch cable and A-to-B type patch cable, there are three general types of array (multi-fiber) cable assemblies. It is noted that the alignment pins on the MTP/MPO connectors are important for maintaining the correct polarity. Therefore, it is necessary to make sure of proper pin position before you connect MTP/MPO fiber with patch cable.
A-to-B type LC/SC duplex patch cable is the standard crossover cord that maps the Tx port to the Rx port. With the flip, A-to-B type patch cable maintains proper polarity. And MTP trunk cable Type B reverses the fiber positions at each end (1 to 12 and 12 to 1) and the connector keys are both oriented face up. This kind of cable connection is recommended to keep proper MTP/MPO polarity.
Rules for MTP/MPO Cable and Cassette Connection
The selection of the MTP/MPO cassette will also determine the choice of MTP/MPO cable. You’d better choose a cassette with proper alignment pins, so that MTP/MPO cassettes can near perfect mate with the MTP/MPO connectors at either end of MTP/MPO cables. In addition, the rear of the adapter mounted on the cassette defines it as either Method A or Method B to correspond with the TIA standard.
Conclusion
Network designer using MTP/MPO components to satisfy the increasing requirement for higher transmission speed, during which one of the big problems—polarity, can be solved by selecting the right types of MTP cables, MTP connectors, MTP cassette and fiber optic cables. The three different polarization methods can be applied according to the satisfy requirements in different situations.
