Create a loopback test connection with this MPO/MTP Single Mode 9/125um fiber loopback plug - Female MPO-12 connector for testing male MPO interfaces with fixed alignment pins - 12-fiber configuration supports loopback testing across single mode links in OS1 and OS2 networks - Angled Physical Contact (APC) polish minimizes back-reflection and ensures stable signaling - IEC and RoHS compliant; Maintain low insertion loss for reliable signal testing