The ML4039-LBT is a fully automated 25G and 100G Loopback tester that validates the signal integrity and checks the CMIS content of SFP28 and QSFP28 Loopbacks. ML4039-LBT performs AC tests on all channels, such as: eye contour, bathtub and BER, and returns a simple pass/fail condition. The Loopback tester is developed for a system manufacturing and installation environment and comes in a ruggedized metal enclosure that houses the ML4039-BTP BERT, module compliance board, and cables. In addition, the ML4039-LBT identifies the module serial number and date code, and configures the MSA content (CMIS)