MTP®/MPO loopback modules are used widely within testing environment especially within parallel optics 40 and 100G networks. Devices allow verification and testing of transceivers featuring MTP® interface – 40G-SR4 QSFP+, 100G QSFP28-SR4 or 100G CXP/CFP-SR10 devices. Loopbacks are built to link Transmitter (TX) and Receivers (RX) positions of MTP® transceivers interfaces. MTP®/MPO loopbacks can facilitate and speed up IL testing of optical networks segments by connecting them to MTP® trunks/patch leads.